OP90GS Equivalent & Substitute Parts

Part Overview

The OP90GS is a general-purpose operational amplifier manufactured by Analog Devices Inc., housed in an 8-SOIC surface-mount package. This device is classified as obsolete, indicating that direct procurement from primary sources may be limited. The OP90GS features a single amplifier circuit with low input bias current (4 nA) and minimal input offset voltage (125 µV), making it suitable for precision analog signal conditioning applications.

Due to its obsolete status, identifying functionally equivalent substitute parts is necessary to maintain design continuity and ensure component availability for production and repair applications. Substitute parts must maintain compatibility with existing circuit designs while meeting the electrical and mechanical requirements of the original specification.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	1	—
Slew Rate	0.012	V/µs
Current - Input Bias	4	nA
Voltage - Input Offset	125	µV
Current - Supply	14	µA
Current - Output / Channel	5	mA
Voltage - Supply Span (Min)	1.6	V
Voltage - Supply Span (Max)	36	V
Operating Temperature	-40 to 85	°C
Mounting Type	Surface Mount	—
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the OP90GS are classified based on electrical parameter compatibility and mechanical interchangeability. The primary substitution criteria are:

Direct Substitutes (Identical Electrical Specifications): Parts that maintain all key electrical parameters including slew rate, input bias current, input offset voltage, supply current, output current, and supply voltage range, while sharing the same 8-SOIC package footprint.

Functional Equivalents (Similar Electrical Performance): Parts that operate within the same application space but may have different electrical characteristics. These parts are suitable for applications where the OP90GS specifications are not strictly limiting, provided that circuit design accommodates parameter variations.

Critical Parameters for Substitution:

Package type: 8-SOIC surface mount (0.154", 3.90mm Width)
Operating temperature range: -40°C to 85°C minimum
Supply voltage range: Must encompass 1.6 V to 36 V
Number of circuits: Single amplifier circuit
Amplifier classification: General purpose or compatible category

Parameter Comparison

Parameter	OP90GS	OP90GSZ	LM4562MAX/NOPB	LMC6036IMX/NOPB	MC33071DR2G	MC33171DT
Manufacturer	Analog Devices Inc.	Analog Devices Inc.	Texas Instruments	Texas Instruments	onsemi	STMicroelectronics
Product Status	Obsolete	Active	Active	Active	Active	Active
Amplifier Type	General Purpose	General Purpose	Audio	CMOS	General Purpose	General Purpose
Number of Circuits	1	1	2	4	1	1
Slew Rate (V/µs)	0.012	0.012	20	1.5	13	2
Current - Input Bias (nA)	4	4	10	0.02	100	20
Voltage - Input Offset (µV)	125	125	100	500	1000	1000
Current - Supply (µA)	14	14	10 (x2)	1.3 (x4)	1900	220
Current - Output / Channel (mA)	5	5	26	8	30	27
Voltage - Supply Span (Min)	1.6 V	1.6 V	5 V	2 V	3 V	4 V
Voltage - Supply Span (Max)	36 V	36 V	34 V	15.5 V	44 V	44 V
Operating Temperature	-40 to 85°C	-40 to 85°C	-40 to 85°C	-40 to 85°C	-40 to 85°C	-40 to 105°C
Package / Case	8-SOIC	8-SOIC	8-SOIC	14-SOIC	8-SOIC	8-SOIC
RoHS Status	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	—	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

OP90GSZ (Analog Devices Inc.)

The OP90GSZ is the direct equivalent of the OP90GS, manufactured by the same supplier with identical electrical specifications and 8-SOIC packaging. This part is currently in active production status with substantial inventory availability (7541 units). The OP90GSZ maintains all electrical parameters of the original design, including slew rate, input bias current, input offset voltage, and supply voltage range. This part is ROHS3 compliant and REACH unaffected, meeting current regulatory requirements. The OP90GSZ is the preferred substitute for direct replacement applications.

MC33171DT (STMicroelectronics)

The MC33171DT is a general-purpose operational amplifier in 8-SOIC packaging with active product status. This part operates within the required temperature range (-40°C to 105°C) and maintains compatibility with the supply voltage requirements (4 V to 44 V minimum and maximum). The MC33171DT exhibits higher slew rate (2 V/µs) and greater output current capability (27 mA) compared to the OP90GS, making it suitable for applications requiring enhanced dynamic performance. This part is ROHS3 compliant and REACH unaffected.

MC33071DR2G (onsemi)

The MC33071DR2G is a general-purpose operational amplifier in 8-SOIC packaging with active product status. This part supports the required operating temperature range and offers extended supply voltage range (3 V to 44 V). The MC33071DR2G provides significantly higher slew rate (13 V/µs) and output current (30 mA), suitable for applications where faster signal transitions are beneficial. This part is ROHS3 compliant and REACH unaffected.

LM4562MAX/NOPB (Texas Instruments)

The LM4562MAX/NOPB is an audio-grade operational amplifier containing two circuits in 8-SOIC packaging. While this part shares the same package footprint and operating temperature range, it contains dual amplifier circuits rather than a single circuit. The LM4562MAX/NOPB requires a minimum supply voltage of 5 V, which exceeds the OP90GS minimum of 1.6 V. This part is suitable only for applications where dual amplifier functionality is required and supply voltage constraints permit 5 V minimum operation. This part is ROHS3 compliant and REACH unaffected.

LMC6036IMX/NOPB (Texas Instruments)

The LMC6036IMX/NOPB is a CMOS operational amplifier containing four circuits in 14-SOIC packaging. This part is not mechanically compatible with the OP90GS due to different package type (14-SOIC versus 8-SOIC). Additionally, the supply voltage range (2 V to 15.5 V maximum) does not encompass the full 36 V maximum of the OP90GS. This part is not recommended as a substitute for the OP90GS.

Frequently Asked Questions (FAQ)

Q: Can the OP90GSZ be used as a direct replacement for the OP90GS?

A: Yes. The OP90GSZ is manufactured by Analog Devices Inc. with identical electrical specifications, including slew rate (0.012 V/µs), input bias current (4 nA), input offset voltage (125 µV), and supply voltage range (1.6 V to 36 V). Both parts use 8-SOIC packaging and operate across the same temperature range (-40°C to 85°C). The OP90GSZ is currently in active production status, whereas the OP90GS is obsolete.

Q: What are the key differences between the OP90GS and MC33171DT?

A: The MC33171DT maintains the same 8-SOIC package and general-purpose amplifier classification. However, the MC33171DT exhibits higher slew rate (2 V/µs versus 0.012 V/µs), higher input bias current (20 nA versus 4 nA), higher input offset voltage (1 mV versus 125 µV), and higher supply current (220 µA versus 14 µA). The MC33171DT supports an extended operating temperature range up to 105°C. These differences indicate enhanced performance characteristics suitable for applications requiring faster signal transitions and higher output current capability.

Q: Is the LMC6036IMX/NOPB compatible with the OP90GS?

A: No. The LMC6036IMX/NOPB uses 14-SOIC packaging, which is not mechanically compatible with the 8-SOIC footprint of the OP90GS. Additionally, the maximum supply voltage of the LMC6036IMX/NOPB (15.5 V) does not accommodate the full 36 V maximum specification of the OP90GS. This part is not suitable as a substitute.

Q: Why does the LM4562MAX/NOPB contain two amplifier circuits when the OP90GS contains one?

A: The LM4562MAX/NOPB is designed as an audio-grade dual operational amplifier, whereas the OP90GS is a single-circuit general-purpose amplifier. The dual-circuit configuration of the LM4562MAX/NOPB allows for stereo audio applications or dual-channel signal processing. For applications requiring only a single amplifier circuit, the additional circuit remains unused.

Q: What is the significance of the 8-SOIC package specification?

A: The 8-SOIC (Small Outline Integrated Circuit) package is a surface-mount component package with 8 pins, measuring 0.154 inches (3.90 mm) in width. This package type determines the physical footprint on a printed circuit board and the pin configuration. Substitute parts must use the same 8-SOIC package to ensure mechanical and electrical compatibility with existing circuit board designs. Parts using different package types (such as 14-SOIC) require circuit board redesign and are not considered direct substitutes.

Q: Are all substitute parts ROHS3 compliant?

A: All active substitute parts listed (OP90GSZ, LM4562MAX/NOPB, LMC6036IMX/NOPB, MC33071DR2G, and MC33171DT) are ROHS3 compliant and REACH unaffected. The original OP90GS does not specify ROHS or REACH status due to its obsolete classification. Current regulatory requirements mandate ROHS3 compliance for new component procurement.

Q: What supply voltage range must a substitute part support?

A: A substitute part must support the full supply voltage range of the OP90GS, which is 1.6 V minimum to 36 V maximum. Parts with restricted supply voltage ranges (such as the LM4562MAX/NOPB with 5 V minimum or the LMC6036IMX/NOPB with 15.5 V maximum) cannot operate across the complete specification range of the original design and are not suitable for all applications.

Q: How does input bias current affect circuit design?

A: Input bias current represents the small DC current flowing into the amplifier input terminals. The OP90GS specifies 4 nA input bias current. Substitute parts with higher input bias current (such as MC33071DR2G at 100 nA) may require circuit design modifications to minimize errors in high-impedance input circuits. For low-impedance applications, differences in input bias current are typically negligible.

Q: What is the importance of slew rate in operational amplifier selection?

A: Slew rate defines the maximum rate at which the amplifier output voltage can change, expressed in volts per microsecond. The OP90GS specifies 0.012 V/µs, indicating slow signal transitions suitable for low-frequency, precision analog applications. Substitute parts with higher slew rates (such as MC33071DR2G at 13 V/µs) support faster signal transitions and are suitable for higher-frequency applications. For low-frequency applications, higher slew rate does not degrade performance.

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