Please enter a valid full or partial manufacturer part number with a minimum of 3 letters or numbers

    OP490 Search Results

    OP490 Result Highlights (3)

    Part ECAD Model Manufacturer Description Download Buy
    OP490GSZ Analog Devices MICROPOWER QUAD OP AMP Visit Analog Devices Buy
    OP490GSZ-REEL Analog Devices MICROPOWER QUAD OP AMP Visit Analog Devices Buy
    OP490GPZ Analog Devices MICROPOWER QUAD OP AMP IC Visit Analog Devices Buy
    SF Impression Pixel

    OP490 Price and Stock

    Analog Devices Inc OP490GSZ-REEL

    IC OPAMP GP 4 CIRCUIT 16SOIC
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    DigiKey OP490GSZ-REEL Digi-Reel 3,066 1
    • 1 $18.91
    • 10 $13.694
    • 100 $10.8596
    • 1000 $9.75
    • 10000 $9.75
    Buy Now
    OP490GSZ-REEL Cut Tape 3,066 1
    • 1 $18.91
    • 10 $13.694
    • 100 $10.8596
    • 1000 $9.75
    • 10000 $9.75
    Buy Now
    OP490GSZ-REEL Reel 2,000 1,000
    • 1 -
    • 10 -
    • 100 -
    • 1000 $9.75
    • 10000 $9.75
    Buy Now
    Mouser Electronics OP490GSZ-REEL 1,135
    • 1 $18.81
    • 10 $13.64
    • 100 $10.83
    • 1000 $9.75
    • 10000 $9.75
    Buy Now
    Verical OP490GSZ-REEL 64 1
    • 1 $10.469
    • 10 $10.469
    • 100 $10.469
    • 1000 $10.469
    • 10000 $10.469
    Buy Now
    Arrow Electronics OP490GSZ-REEL Cut Strips 64 10 Weeks 1
    • 1 $13.494
    • 10 $11.689
    • 100 $10.469
    • 1000 $10.469
    • 10000 $10.469
    Buy Now
    Newark OP490GSZ-REEL Cut Tape 719 1
    • 1 $15.24
    • 10 $13.02
    • 100 $10.73
    • 1000 $9.74
    • 10000 $9.74
    Buy Now
    Analog Devices Inc OP490GSZ-REEL 614 1
    • 1 $18.91
    • 10 $13.694
    • 100 $10.8596
    • 1000 $9.75
    • 10000 $9.75
    Buy Now
    Bristol Electronics OP490GSZ-REEL 95 1
    • 1 $13.5
    • 10 $10.125
    • 100 $8.1
    • 1000 $8.1
    • 10000 $8.1
    Buy Now
    OP490GSZ-REEL 10
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    Get Quote
    Quest Components OP490GSZ-REEL 76
    • 1 $18
    • 10 $18
    • 100 $11.25
    • 1000 $11.25
    • 10000 $11.25
    Buy Now

    Analog Devices Inc OP490GSZ

    IC OPAMP GP 4 CIRCUIT 16SOIC
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    DigiKey OP490GSZ Tube 83 1
    • 1 $18.91
    • 10 $13.694
    • 100 $10.8596
    • 1000 $9.75
    • 10000 $9.75
    Buy Now
    Mouser Electronics OP490GSZ 39
    • 1 $16.13
    • 10 $15.21
    • 100 $12.83
    • 1000 $11.42
    • 10000 $11.42
    Buy Now
    Verical OP490GSZ 47 47
    • 1 -
    • 10 -
    • 100 $10.82
    • 1000 $9.63
    • 10000 $9.63
    Buy Now
    OP490GSZ 39 1
    • 1 $21.0743
    • 10 $21.0743
    • 100 $21.0743
    • 1000 $21.0743
    • 10000 $21.0743
    Buy Now
    OP490GSZ 7 7
    • 1 -
    • 10 $12.286
    • 100 $10.82
    • 1000 $9.63
    • 10000 $9.63
    Buy Now
    Arrow Electronics OP490GSZ 39 10 Weeks 1
    • 1 $15.962
    • 10 $13.593
    • 100 $10.82
    • 1000 $9.63
    • 10000 $9.63
    Buy Now
    OP490GSZ 7 10 Weeks 47
    • 1 -
    • 10 -
    • 100 $10.82
    • 1000 $9.63
    • 10000 $9.63
    Buy Now
    Newark OP490GSZ Bulk 19 1
    • 1 $16.13
    • 10 $15.21
    • 100 $13.71
    • 1000 $12.21
    • 10000 $12.21
    Buy Now
    Analog Devices Inc OP490GSZ 64
    • 1 $18.91
    • 10 $13.694
    • 100 $10.8596
    • 1000 $7.66
    • 10000 $7.66
    Buy Now
    Rochester Electronics OP490GSZ 3 1
    • 1 $11.38
    • 10 $11.38
    • 100 $10.69
    • 1000 $9.67
    • 10000 $9.67
    Buy Now
    ComSIT USA OP490GSZ 28
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    Get Quote

    Analog Devices Inc OP490GPZ

    IC OPAMP GP 4 CIRCUIT 14DIP
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    DigiKey OP490GPZ Tube 15 1
    • 1 $17.13
    • 10 $12.325
    • 100 $9.7118
    • 1000 $8.6
    • 10000 $8.6
    Buy Now
    Mouser Electronics OP490GPZ 1,012
    • 1 $15.72
    • 10 $12.33
    • 100 $11.09
    • 1000 $10.07
    • 10000 $10.07
    Buy Now
    Verical OP490GPZ 600 50
    • 1 -
    • 10 -
    • 100 $9.37
    • 1000 $9.37
    • 10000 $9.37
    Buy Now
    Newark OP490GPZ Bulk 291 1
    • 1 $14.58
    • 10 $13.4
    • 100 $11.32
    • 1000 $10.07
    • 10000 $10.07
    Buy Now
    Analog Devices Inc OP490GPZ 603
    • 1 $17.13
    • 10 $12.325
    • 100 $9.7118
    • 1000 $8.6
    • 10000 $8.6
    Buy Now
    TME OP490GPZ 1
    • 1 $14.7
    • 10 $11.6
    • 100 $10.9
    • 1000 $10.9
    • 10000 $10.9
    Get Quote

    Analog Devices Inc OP490GS-REEL

    IC OPAMP GP 4 CIRCUIT 16SOIC
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    DigiKey OP490GS-REEL Cut Tape
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    Buy Now

    Hosa Technology GOP-490

    Fiber Optic Adapter, Toslink To Mini-Toslink |Hosa GOP-490
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    Newark GOP-490 Bulk 1
    • 1 $11.95
    • 10 $11.95
    • 100 $11.95
    • 1000 $11.95
    • 10000 $11.95
    Buy Now

    OP490 Datasheets (29)

    Part ECAD Model Manufacturer Description Curated Datasheet Type PDF
    OP490 Analog Devices Low-Voltage Micropower Quad Operational Amplifier Original PDF
    OP490 Analog Devices Low-Voltage Micropower Quad Operational Amplifier Original PDF
    OP490 Maxwell Technologies Low Voltage Micropower Quad Operational Amplifier Original PDF
    OP-490 Unknown Monolithic Op Amp Data Book Scan PDF
    OP490ATC/883 Analog Devices Low Voltage Micropower Quad Operational Amplifier Original PDF
    OP490ATC/883C Analog Devices Low-Voltage Micropower Quad Operational Amplifier Original PDF
    OP490AY Analog Devices Low Voltage Micropower Quad Operational Amplifier Original PDF
    OP490AY Analog Devices Low-Voltage Micropower Quad Operational Amplifier; Package: CERDIP GLASS SEAL; No of Pins: 14; Temperature Range: Industrial Original PDF
    OP490AY/883C Analog Devices Low-Voltage Micropower Quad Operational Amplifier Original PDF
    OP490EY Analog Devices Low Voltage Micropower Quad Operational Amplifier Original PDF
    OP490EY Analog Devices Low Voltage Micropower Quad Operational Amplifier Original PDF
    OP490FY Analog Devices Low Voltage Micropower Quad Operational Amplifier Original PDF
    OP490FY Analog Devices Low Voltage Micropower Quad Operational Amplifier Original PDF
    OP490GBC Analog Devices Low-Voltage Micropower Quad Operational Amplifier; Package: CHIPS OR DIE; No of Pins: -; Temperature Range: TBD Original PDF
    OP490GP Analog Devices Low Voltage Micropower Quad Operational Amplifier Original PDF
    OP490GP Analog Devices Low Voltage Micropower Quad Operational Amplifier Original PDF
    OP490GP Analog Devices Over 600 obsolete distributor catalogs now available on the Datasheet Archive - Amplifier, Low Voltage Micropower Quad Op Amp, Pkg Style 14 Lead PDIP Scan PDF
    OP490GPZ Analog Devices Low-Voltage Micropower Quad Operational Amplifier Original PDF
    OP490GS Analog Devices Low Voltage Micropower Quad Operational Amplifier Original PDF
    OP490GS Analog Devices Low Voltage Micropower Quad Operational Amplifier Original PDF

    OP490 Datasheets Context Search

    Catalog Datasheet MFG & Type PDF Document Tags

    Untitled

    Abstract: No abstract text available
    Text: OP490 Quad Low Voltage Micropower Operational Amplifier Logic Diagram One Amplifier DESCRIPTION: • RAD-PAK technology-hardened against natural space • radiation • Total dose hardness: - > 100 krad (Si), depending upon space mission • Package: - 16 pin Rad-Pak® flat package


    Original
    PDF OP490 00V/mV OP490 inpu10

    OP490

    Abstract: OP490G op490s
    Text: BACK PIN CONNECTION 14-Pin Hermetic DIP Y-Suffix 14-Pin Plastic DIP (P-Suffix) OUT A 1 14 OUT D –IN A 2 13 –IN D +IN A 3 12 +IN D 11 V– V+ 4 +IN B 5 10 +IN C –IN B 6 9 –IN C OUT B 7 8 OUT C GENERAL DESCRIPTION 16-Pin SOL (S-Suffix) The OP490 is a high-performance micropower quad op amp


    Original
    PDF OP490 14-Pin OP490 DAC8408 OP490G op490s

    Untitled

    Abstract: No abstract text available
    Text: OP490 Low Voltage Micropower Quad Operational Amplifier Logic Diagram DESCRIPTION: • RAD-PAK technology-hardened against natural space radiation • Package: - 16 pin Rad-Pak® flat package • Low input offset voltage: 5 µV max • Low offset voltage drift


    Original
    PDF OP490 OP490

    OP490

    Abstract: Maxwell F1601 OP490RP
    Text: OP490 Low Voltage Micropower Quad Operational Amplifier Logic Diagram DESCRIPTION: • RAD-PAK technology-hardened against natural space radiation • Package: - 16 pin Rad-Pak® flat package • Low input offset voltage: 5 µV max • Low offset voltage drift


    Original
    PDF OP490 OP490 Maxwell F1601 OP490RP

    OP490

    Abstract: No abstract text available
    Text: Low Voltage, Micropower, Quad Operational Amplifier OP490 FUNCTIONAL BLOCK DIAGRAMS OUT A 1 14 OUT D –IN A 2 13 +IN A 3 12 +IN D OP490 –IN D V+ 4 +IN B 5 10 +IN C –IN B 6 9 –IN C OUT B 7 8 OUT C 11 V– 00308-001 Single/dual-supply operation 1.6 V to 36 V


    Original
    PDF OP490 14-Lead 032707-B OP490GP OP490GPZ OP490GS OP490GSZ OP490GSZ-REEL OP490

    OP490

    Abstract: OP490EY
    Text: PIN CONNECTION 14-Pin Hermetic DIP Y-Suffix 14-Pin Plastic DIP (P-Suffix) OUT A 1 14 OUT D –IN A 2 13 –IN D +IN A 3 12 +IN D 11 V– V+ 4 +IN B 5 10 +IN C –IN B 6 9 –IN C OUT B 7 8 OUT C GENERAL DESCRIPTION 16-Pin SOL (S-Suffix) The OP490 is a high-performance micropower quad op amp


    Original
    PDF 14-Pin 16-Pin OP490 OP490 OP490EY

    db opera 415

    Abstract: 100Krl SPACE POWER ELECTRONICS sfp 88E1111 transistor amplifier 5v to 15v OP490RP
    Text: LOW VOLTAGE MICROPOWER QUAD OPERATIONAL AMPLIFIER SPACE ELECTRONICS INC. SPACE PRODUCTS OP490RP OUT A 1 16 OUT D 2 15 -IN D +IN A 3 14 +IN D -IN A V+ 4 13 V- OP490RP +IN B 5 12 +IN C 6 11 -IN C -IN B OUT B 7 NC 8 10 OUT C 9 NC Memory FEATURES: DESCRIPTION:


    Original
    PDF OP490RP 00Rev1 db opera 415 100Krl SPACE POWER ELECTRONICS sfp 88E1111 transistor amplifier 5v to 15v OP490RP

    OP490

    Abstract: low noise quad OP37 quad OP37 DAC8408 MS-001 OP37
    Text: Low Voltage Micropower Quad Operational Amplifier OP490 OUT A 1 14 OUT D –IN A 2 13 +IN A 3 12 +IN D OP490 –IN D V+ 4 +IN B 5 10 +IN C –IN B 6 9 –IN C OUT B 7 8 OUT C 11 V– 00308-001 Single/dual-supply operation 1.6 V to 36 V ±0.8 V to ±18 V Single-supply operation; input and output


    Original
    PDF OP490 14-Lead 032707-B OP490GP OP490GPZ OP490GS1 OP490GSZ1 OP490GSZ-REEL1 OP490 low noise quad OP37 quad OP37 DAC8408 MS-001 OP37

    schematic diagram solar inverter

    Abstract: OP490 solar inverters circuit diagram quad OP37 solar inverters schematic diagram low noise quad OP37 OP490GPZ DAC8408 MS-001 OP37
    Text: Low Voltage, Micropower, Quad Operational Amplifier OP490 FUNCTIONAL BLOCK DIAGRAMS OUT A 1 14 OUT D –IN A 2 13 +IN A 3 12 +IN D OP490 –IN D V+ 4 +IN B 5 10 +IN C –IN B 6 9 –IN C OUT B 7 8 OUT C 11 V– 00308-001 Single/dual-supply operation 1.6 V to 36 V


    Original
    PDF OP490 14-Lead 032707-B OP490GP OP490GPZ OP490GS OP490GSZ OP490GSZ-REEL schematic diagram solar inverter OP490 solar inverters circuit diagram quad OP37 solar inverters schematic diagram low noise quad OP37 OP490GPZ DAC8408 MS-001 OP37

    rosemount 118mf

    Abstract: 2N4393 capacitor 106 35K sensor rosemount 118mf 106 35K CA3096 LT2078 LT2078ACS8 LT2079
    Text: LT 2078/LT 2079 Micropower, Dual and Quad, Single Supply, Precision Op Amps U FEATURES • ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ DESCRIPTION SO Package with Standard Pinout Supply Current per Amplifier: 50µA Max Offset Voltage: 70µV Max Offset Current: 250pA Max


    Original
    PDF 2078/LT 250pA 200kHz LT1211/LT1212 14MHz, LT1490/LT1491 200kHz LT2178/LT2179 14-Lead 85kHz rosemount 118mf 2N4393 capacitor 106 35K sensor rosemount 118mf 106 35K CA3096 LT2078 LT2078ACS8 LT2079

    OP490

    Abstract: OP490D solar inverters schematic diagram OP490EY OP490FY OP490GP OP490GS 75nf OP490AYMDA
    Text: a FEATURES Single/Dual-Supply Operation 1.6 V to 36 V ؎0.8 V to ؎18 V True Single-Supply Operation; Input and Output Voltage Ranges Include Ground Low Supply Current: 80 ␮A Max High Output Drive: 5 mA Min Low Offset Voltage: 0.5 mA Max High Open-Loop Gain: 700 V/mV Min


    Original
    PDF OP490 14-Lead OP490 28-Pin C00308 OP490D solar inverters schematic diagram OP490EY OP490FY OP490GP OP490GS 75nf OP490AYMDA

    tsc4429

    Abstract: TSC7660 TSC7107 TSC7106 TSC7109 TSC7117 TSC1426 TSC7650 tsc4427 lt1174
    Text: Code Key: PU – PP – FE – SP – Plug-In Upgrade Pin-for-Pin Compatible Functional Equivalent Similar Part AMCC MAXIM S3005 S3006 S3017 S3023 S3024 S3025 S3026 S3027 S3028B S3033 S3040 S3043 S3044 S3047 S3049 S3050 MAX3690 MAX3680 MAX3690 MAX3675 MAX3675


    Original
    PDF S3005 S3006 S3017 S3023 S3024 S3025 S3026 S3027 S3028B S3033 tsc4429 TSC7660 TSC7107 TSC7106 TSC7109 TSC7117 TSC1426 TSC7650 tsc4427 lt1174

    Lt1077

    Abstract: No abstract text available
    Text: LT1077 Micropower, Single Supply, Precision Op Amp FEATURES • ■ ■ ■ ■ ■ ■ ■ ■ U ■ DESCRIPTIO 60µA Max Supply Current 40µV Max Offset Voltage 350pA Max Offset Current 0.5µVP-P 0.1Hz to 10Hz Voltage Noise 2.5pAP-P 0.1Hz to 10Hz Current Noise


    Original
    PDF LT1077 350pA 250kHz OP-07, OP-77, AD707, LT1001, LT1O12 1077fa Lt1077

    Untitled

    Abstract: No abstract text available
    Text: a Quad 8-Bit Multiplying CMOS D/A Converter with Memory DAC8408 FEATURES Four DACs in a 28 Pin, 0.6 Inch Wide DIP or 28-Pin JEDEC Plastic Chip Carrier ؎1/4 LSB Endpoint Linearity Guaranteed Monotonic DACs Matched to Within 1% Microprocessor Compatible Read/Write Capability with Memory


    Original
    PDF 28-Pin DAC8408

    marking code E5 SMD ic sot23-5

    Abstract: Satellite DISEQC SWITCH 4x1 acer laptop motherboard circuit diagram acer laptop battery pinout nec tokin oe 128 schematic LG TV lcd backlight inverter ACER laptop schematic diagram HP COMPAQ MOTHERBOARD CIRCUIT diagram schematic acer lcd backlight inverter APC 5kv UPS CIRCUIT DIAGRAM
    Text: We hope that you will find this CD-ROM a helpful tool for selecting the best Maxim IC for your design. To the left, please find a menu of the documents contained on this CD-ROM. Click on each item for a more detailed list. All of the indexes, tables, and trees on this CD-ROM contain links to product data sheets. After you have viewed a


    Original
    PDF MAX038 MAX038EVKIT 2001elec marking code E5 SMD ic sot23-5 Satellite DISEQC SWITCH 4x1 acer laptop motherboard circuit diagram acer laptop battery pinout nec tokin oe 128 schematic LG TV lcd backlight inverter ACER laptop schematic diagram HP COMPAQ MOTHERBOARD CIRCUIT diagram schematic acer lcd backlight inverter APC 5kv UPS CIRCUIT DIAGRAM

    toshiba laptop schematic diagram

    Abstract: acer motherboard circuit diagram MAX1270 C source code MAX11871 mp 9141 es dc-dc lm324 pwm speed motor 220v DC MOTOR SPEED CONTROLLER schematic ACER laptop schematic diagram L-band down converter for satellite tuner wideband acer laptop MOTHERBOARD Chip Level MANUAL acer laptop motherboard circuit diagram
    Text: Welcome to the Maxim Full-Line Data Catalog. We hope you find this CD-ROM a helpful tool for selecting the best Maxim IC for your design. This CD-ROM contains: The Maxim Full-Line Data Catalog The menu to the left of this page lists the available documents. Use the small


    Original
    PDF

    OP490

    Abstract: solar pv inverter schematic OP-490 C00308
    Text: a FEATURES Single/Dual-Supply Operation 1.6 V to 36 V ؎0.8 V to ؎18 V True Single-Supply Operation; Input and Output Voltage Ranges Include Ground Low Supply Current: 80 ␮A Max High Output Drive: 5 mA Min Low Offset Voltage: 0.5 mA Max High Open-Loop Gain: 700 V/mV Min


    Original
    PDF OP490 14-Lead OP490 28-Pin C00308 solar pv inverter schematic OP-490

    op220 "direct replacement"

    Abstract: LT1034 op220 AD707 LT1001 LT1012 LT1077 OP-07 OP-77
    Text: r r TECHNOLOGY u r m _LT1Q77 Micropower, Single Supply, Precision Op Amp F€ATUA€S DCSCRIPTiOn • 60/iA Max Supply Current ■ 40/tV Max Offset Voltage ■ 350pA Max Offset Current ■ 0.5fiVp-p 0.1 Hz to 10Hz Voltage Noise ■ 2.5pAp-p 0.1 Hz to 10Hz Current Noise


    OCR Scan
    PDF 60/xA 40/tV 350pA 250kHz OP-07, OP-77, AD707, LT1001, LT1012 108dB op220 "direct replacement" LT1034 op220 AD707 LT1001 LT1077 OP-07 OP-77

    Untitled

    Abstract: No abstract text available
    Text: Precision, Low Power, Micropower Dual Operational Amplifier ANALO G DEVICES ► OP-290 dual s u p p lie s o f ± 0 .8 V to ±18V. In p u t vo lta g e range includes the negative rail a llo w in g th e OP-290 to a cco m m o d a te input sig n a ls d o w n to g ro u n d in s in g le s u p p ly opera tion . The


    OCR Scan
    PDF OP-290 OP-290 10/LiV/mA REF-43 OP-290.

    OPA490

    Abstract: OP490
    Text: OP-490/883 PMl LOW-VOLTAGE MICROPOWER AMPLIFIER P r e c i s i o n M o n o l i t h i c s Inc. 1.0 SCOPE This specification covers the detail requirements for a lovy-voltage, micropower quad operational amplifier. It is highly recommended that this data sheet be used as a baseline for new military ¡or


    OCR Scan
    PDF OP-490/883 OP-490AY/883 OP-49QATC/883 MIL-M-38510) 14-lead 28-contact 28-LEAD 14-PIN 0195-01E OPA490 OP490

    0P490

    Abstract: OP490
    Text: AN ALO G D E V IC E S Low-Voltage Micropower Quad Operational Amplifier 0P-490 1.0 SCO PE This specification covers the detail requirements for a low-voltage, micropower quad operational amplifier. It is highly recom m ended that this data sheet be used a s a baseline for new military or


    OCR Scan
    PDF 0P-490 OP-490AY/883 OP-490ATC/883 MIL-M-38510) 14-lead 28-contact 28-LEAD 14-PIN OP-490 0P490 OP490

    Untitled

    Abstract: No abstract text available
    Text: a FEATURES Four Independent Sample-and-Holds Internal Hold Capacitors High Accuracy: 12 Bit Very Low Droop Rate: 2 mV/s typ Output Buffers Stable for CL < 500 pF TTL/CMOS Compatible Logic Inputs Single or Dual Supply Applications Monolithic Low Power CMOS Design


    OCR Scan
    PDF SMP04* SMP04 techno50 16-Lead R-16A)

    2952 8pin

    Abstract: No abstract text available
    Text: Precision Low-Power Micropower Dual Operational Amplifier A N A LO G D E V IC E S OP-290 FEATURES • • • • • • • • • Single/Dual Supply Operation. +1.6V to +36V .±0.8V to ±18V True Single-Supply Operation; Input and Output Voltage


    OCR Scan
    PDF OP-290 00V/mV Form36V 12ppm/Â 10/jV/mA REF-43 OP-290. 2952 8pin

    transistor bc 567

    Abstract: Temperature to 4-20mA N2905 4-20ma current sourcing circuit OP90 equivalent TRANSISTOR BC 157 pin connection IC 567 8pin ip311 ref43 REF43GP
    Text: +2.5V Low-Power Precision Voltage Reference REF-43 AN ALO G D E V IC E S □ FEATURES • • • • • • • +2.5 Vòlt O utput . ±0.05% Max Low Temperature C o e ffic ie n t. 10ppm/°C Max


    OCR Scan
    PDF REF-43 10ppm/Â 20ppm/mA 450/tA 20-CONTACT REF43BJ* REF43BZ* REF438 1N4002 transistor bc 567 Temperature to 4-20mA N2905 4-20ma current sourcing circuit OP90 equivalent TRANSISTOR BC 157 pin connection IC 567 8pin ip311 ref43 REF43GP