OP42GS Equivalent & Substitute Parts

Part Overview

The OP42GS is a J-FET operational amplifier manufactured by Analog Devices Inc., housed in an 8-SOIC surface mount package. This single-circuit amplifier is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The OP42GS delivers a 50V/µs slew rate and 10 MHz gain bandwidth product, suitable for applications requiring low input bias current and moderate bandwidth performance.

Key Parameters

Parameter	Value
Manufacturer Part Number	OP42GS
Manufacturer	Analog Devices Inc.
Category	Linear, Amplifiers
Amplifier Type	J-FET
Number of Circuits	1
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Slew Rate	50V/µs
Gain Bandwidth Product	10 MHz
Current - Input Bias	130 pA
Voltage - Input Offset	1.5 mV
Current - Supply	5.1 mA
Current - Output / Channel	33 mA
Voltage - Supply Span (Min)	16 V
Voltage - Supply Span (Max)	40 V
Operating Temperature	-40°C ~ 85°C
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the OP42GS is determined by electrical and mechanical compatibility across the following critical parameters:

Package Compatibility: All substitute parts must use the 8-SOIC surface mount package to ensure direct PCB footprint compatibility.

Amplifier Type & Circuit Count: The OP42GS is a single-circuit J-FET amplifier. Direct substitutes maintain this configuration, though general-purpose amplifiers with equivalent electrical performance are included as alternatives.

Electrical Performance Criteria: Substitutes are grouped based on:

Slew Rate: 50V/µs (OP42GS specification)
Gain Bandwidth Product: 10 MHz (OP42GS specification)
Input Bias Current: 130 pA (OP42GS specification)
Input Offset Voltage: 1.5 mV (OP42GS specification)
Supply Current: 5.1 mA (OP42GS specification)
Output Current per Channel: 33 mA (OP42GS specification)
Supply Voltage Range: 16V to 40V (OP42GS specification)

Operating Temperature Range: The OP42GS operates from -40°C to 85°C. Substitutes with extended or equivalent temperature ranges are acceptable.

Direct Equivalent: OP42GSZ is the active production equivalent of the obsolete OP42GS, maintaining identical electrical specifications and packaging.

Alternative Substitutes: Parts including TLC071 series (TLC071AID, TLC071CD, TLC071CDR, TLC071ID, TLC071IDR) and TLC081 series (TLC081AID, TLC081AIDR) provide general-purpose amplifier functionality in the same 8-SOIC package with comparable gain bandwidth product and slew rate performance. OPA137UA offers J-FET amplifier characteristics with reduced supply current requirements.

Parameter Comparison

Parameter	OP42GS	OP42GSZ	OPA137UA	TLC071AID	TLC071CD	TLC071CDR	TLC071ID	TLC071IDR	TLC081AID	TLC081AIDR
Manufacturer	Analog Devices	Analog Devices	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Amplifier Type	J-FET	J-FET	J-FET	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose
Number of Circuits	1	1	1	1	1	1	1	1	1	1
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Slew Rate	50V/µs	50V/µs	3.5V/µs	19V/µs	19V/µs	19V/µs	19V/µs	19V/µs	19V/µs	19V/µs
Gain Bandwidth Product	10 MHz	10 MHz	1 MHz	10 MHz	10 MHz	10 MHz	10 MHz	10 MHz	10 MHz	10 MHz
Current - Input Bias	130 pA	130 pA	5 pA	1.5 pA	1.5 pA	1.5 pA	1.5 pA	1.5 pA	2 pA	2 pA
Voltage - Input Offset	1.5 mV	1.5 mV	2.5 mV	390 µV	390 µV	390 µV	390 µV	390 µV	390 µV	390 µV
Current - Supply	5.1 mA	5.1 mA	220 µA	2.1 mA	2.1 mA	2.1 mA	2.1 mA	2.1 mA	1.9 mA	1.9 mA
Current - Output / Channel	33 mA	33 mA	60 mA	57 mA	57 mA	57 mA	57 mA	57 mA	57 mA	57 mA
Voltage - Supply Span (Min)	16 V	16 V	4.5 V	4.5 V	4.5 V	4.5 V	4.5 V	4.5 V	4.5 V	4.5 V
Voltage - Supply Span (Max)	40 V	40 V	36 V	16 V	16 V	16 V	16 V	16 V	16 V	16 V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	Not Specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Recommendation: OP42GSZ

The OP42GSZ is the direct active production equivalent of the obsolete OP42GS. It maintains identical electrical specifications, package configuration, and operating parameters. OP42GSZ is ROHS3 compliant and carries active product status, ensuring long-term availability and supply chain continuity. This part is the preferred choice for direct replacement in existing designs.

Secondary Recommendations: TLC071 Series (TLC071AID, TLC071CD, TLC071CDR, TLC071ID, TLC071IDR)

The TLC071 series provides general-purpose amplifier functionality with 10 MHz gain bandwidth product matching the OP42GS specification. These parts are housed in identical 8-SOIC packages and deliver comparable slew rate performance at 19V/µs. All TLC071 variants are ROHS3 compliant and carry active product status. The TLC071 series exhibits lower input bias current (1.5 pA versus 130 pA) and reduced supply current (2.1 mA versus 5.1 mA), making them suitable for power-sensitive applications. Temperature range variants are available: TLC071ID and TLC071IDR support -40°C to 125°C operation, while TLC071CD and TLC071CDR operate from 0°C to 70°C.

Tertiary Recommendation: TLC081 Series (TLC081AID, TLC081AIDR)

The TLC081 series offers general-purpose amplifier performance with 10 MHz gain bandwidth product and 19V/µs slew rate. These parts are ROHS3 compliant, active products in 8-SOIC packages. The TLC081 series demonstrates the lowest supply current (1.9 mA) among all substitutes while maintaining comparable output current capability (57 mA). Operating temperature range extends from -40°C to 125°C.

Alternative Recommendation: OPA137UA

The OPA137UA is a J-FET amplifier from Texas Instruments' MicroAmplifier™ series, maintaining J-FET amplifier type consistency with the OP42GS. This part operates with significantly reduced supply current (220 µA) and lower input bias current (5 pA). However, the OPA137UA exhibits reduced slew rate (3.5V/µs) and gain bandwidth product (1 MHz), making it suitable only for applications where bandwidth requirements are less stringent than the original OP42GS specification. The OPA137UA supports supply voltages from 4.5V to 36V and operates across -40°C to 85°C. Moisture sensitivity level is MSL 3 (168 Hours).

Compliance Considerations

All recommended substitutes are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements. The OP42GSZ maintains the same MSL rating (1 - Unlimited) as the original OP42GS, while TLC071 and TLC081 series also carry MSL 1 ratings. OPA137UA carries MSL 3 (168 Hours), requiring appropriate moisture control during storage and handling.

Frequently Asked Questions (FAQ)

Q: Can OP42GSZ be used as a direct replacement for OP42GS?

A: Yes. OP42GSZ is the active production equivalent of the obsolete OP42GS, maintaining identical electrical specifications, package configuration (8-SOIC), and operating parameters. Direct PCB substitution is supported without design modification.

Q: What are the key differences between OP42GS and TLC071 series substitutes?

A: The primary differences are amplifier type classification and electrical performance. OP42GS is classified as J-FET, while TLC071 is general-purpose. Both deliver 10 MHz gain bandwidth product and 8-SOIC packaging. TLC071 series exhibits lower input bias current (1.5 pA versus 130 pA), reduced supply current (2.1 mA versus 5.1 mA), and lower input offset voltage (390 µV versus 1.5 mV). Slew rate differs: OP42GS provides 50V/µs while TLC071 delivers 19V/µs. Supply voltage range differs: OP42GS supports 16V to 40V, while TLC071 supports 4.5V to 16V.

Q: Is OPA137UA suitable for all OP42GS applications?

A: OPA137UA is suitable only for applications where reduced bandwidth requirements are acceptable. OPA137UA provides 1 MHz gain bandwidth product and 3.5V/µs slew rate, significantly lower than OP42GS specifications (10 MHz and 50V/µs respectively). OPA137UA is advantageous for ultra-low power applications due to 220 µA supply current. Applications requiring the full 10 MHz bandwidth and 50V/µs slew rate of the OP42GS should use OP42GSZ or TLC071/TLC081 series instead.

Q: What packaging options are available for substitute parts?

A: All substitute parts are available in 8-SOIC surface mount packages, ensuring direct PCB footprint compatibility with OP42GS designs. Packaging variants differ by delivery format: Tube, Cut Tape (CT) & Digi-Reel®, and Tape & Reel (TR). These delivery formats do not affect electrical performance or package dimensions.

Q: Are there temperature range considerations when selecting substitutes?

A: Yes. OP42GS operates from -40°C to 85°C. TLC071CD and TLC071CDR operate from 0°C to 70°C, which is narrower than OP42GS. TLC071ID, TLC071IDR, TLC081AID, and TLC081AIDR extend to -40°C to 125°C, providing broader temperature coverage. OPA137UA matches OP42GS at -40°C to 85°C. Select substitutes based on application temperature requirements.

Q: What is the significance of MSL (Moisture Sensitivity Level) ratings?

A: MSL ratings indicate moisture sensitivity during storage and handling. OP42GS and OP42GSZ carry MSL 1 (Unlimited), requiring no special moisture control. TLC071 and TLC081 series also carry MSL 1. OPA137UA carries MSL 3 (168 Hours), requiring moisture control and baking procedures if storage exceeds 168 hours in standard conditions. Select MSL 1 parts for applications with less stringent moisture handling requirements.

Q: Can multiple TLC071 or TLC081 parts replace a single OP42GS?

A: No. OP42GS is a single-circuit amplifier, and TLC071/TLC081 substitutes are also single-circuit devices in 8-SOIC packages. One-to-one substitution applies. For multi-channel requirements, separate devices or quad-channel variants (such as OPA4131PJ) would be necessary, though these use different packages (14-DIP) and are not direct substitutes.

Q: What compliance certifications apply to substitute parts?

A: All recommended substitutes are ROHS3 compliant and REACH unaffected. OP42GSZ carries identical compliance status to OP42GS. These certifications ensure compliance with current environmental regulations for electronic components in regulated markets.

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