OP275GS Equivalent & Substitute Parts

Part Overview

The OP275GS is an audio amplifier integrated circuit manufactured by Analog Devices Inc., configured as a 2-circuit audio amplifier in an 8-SOIC surface mount package. The device is classified as obsolete, though 5,311 units remain in stock as new original inventory. The OP275GS operates across a wide supply voltage range of 9V to 44V and is designed for audio frequency applications with a slew rate of 22V/µs and gain bandwidth product of 9 MHz.

Due to the obsolete product status of the OP275GS, identification of equivalent and substitute parts is necessary for ongoing design support, production continuity, and long-term component availability assurance. Substitute parts are selected based on matching electrical performance parameters, package compatibility, and functional equivalence within the audio amplifier category.

Key Parameters

Parameter	OP275GS Value
Amplifier Type	Audio
Number of Circuits	2
Slew Rate	22 V/µs
Gain Bandwidth Product	9 MHz
Current - Input Bias	100 nA
Voltage - Input Offset	1 mV
Current - Supply	4 mA
Current - Output / Channel	90 mA
Voltage - Supply Span (Min)	9 V
Voltage - Supply Span (Max)	44 V
Operating Temperature	-40°C to 85°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the OP275GS are identified through strict alignment of the following critical parameters:

Package Compatibility: All substitute parts must be housed in the 8-SOIC (0.154", 3.90mm Width) surface mount package to ensure direct board-level compatibility without layout modifications.

Circuit Configuration: All substitutes contain 2 circuits, matching the dual-amplifier configuration of the OP275GS.

Supply Voltage Range: Substitute parts must support the minimum 9V supply requirement and accommodate the maximum 44V supply specification of the OP275GS, or operate within a subset of this range that covers the intended application voltage window.

Electrical Performance Envelope: Substitutes are grouped based on slew rate, gain bandwidth product, input bias current, and output current capability. Parts with comparable or superior performance in these metrics are classified as direct or functional equivalents.

Mounting and Thermal Characteristics: All substitutes are surface mount devices with moisture sensitivity level MSL 1 (Unlimited), ensuring compatibility with standard PCB assembly processes.

The OP275GSZ represents a direct equivalent with identical electrical specifications but active product status and tube packaging. The LT1057 and LT1113 series provide J-FET input alternatives with lower input bias current characteristics. The ADA4075-2ARZ offers general-purpose amplifier functionality with extended operating temperature range.

Parameter Comparison

Parameter	OP275GS	OP275GSZ	ADA4075-2ARZ	LT1057IS8#PBF	LT1113CS8#PBF	LT1169CS8#PBF
Amplifier Type	Audio	Audio	General Purpose	J-FET	J-FET	J-FET
Number of Circuits	2	2	2	2	2	2
Slew Rate (V/µs)	22	22	12	13	3.9	4.2
Gain Bandwidth Product (MHz)	9	9	6.5	5	5.6	5.3
Current - Input Bias (nA/pA)	100 nA	100 nA	30 nA	7 pA	300 pA	4 pA
Voltage - Input Offset (mV/µV)	1 mV	1 mV	200 µV	220 µV	550 µV	600 µV
Current - Supply (mA)	4	4	1.8 (x2 Channels)	1.7 (x2 Channels)	5.3 (x2 Channels)	5.3 (x2 Channels)
Current - Output / Channel (mA)	90	90	40	Not specified	Not specified	Not specified
Voltage - Supply Span (Min)	9 V	9 V	9 V	20 V	9 V	9 V
Voltage - Supply Span (Max)	44 V	44 V	36 V	36 V	40 V	40 V
Operating Temperature	-40°C to 85°C	-40°C to 85°C	-40°C to 125°C	-40°C to 85°C	-40°C to 85°C	0°C to 70°C
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

OP275GSZ is the primary direct substitute for the OP275GS. This part maintains identical electrical specifications including 22V/µs slew rate, 9 MHz gain bandwidth product, 100 nA input bias current, and 90 mA output current per channel. The OP275GSZ carries active product status with ROHS3 compliance and REACH unaffected certification, ensuring long-term availability and regulatory alignment. The only difference is packaging format (tube versus unspecified for the original), which does not affect electrical performance or board-level integration.

ADA4075-2ARZ serves as a functional substitute for applications where general-purpose amplifier characteristics are acceptable. This device operates within the 9V to 36V supply range, which covers most OP275GS applications except those requiring the full 44V maximum. The ADA4075-2ARZ features extended operating temperature range (-40°C to 125°C) and lower input bias current (30 nA), with active product status and full compliance certifications.

LT1057 Series (LT1057IS8#PBF, LT1057IS8#TRPBF, LT1057S8#PBF, LT1057S8#TRPBF) provides J-FET input alternatives with extremely low input bias current (7 pA). These parts are suitable for applications prioritizing input impedance and low bias current performance. The minimum supply voltage requirement of 20V restricts use to applications operating above this threshold. Operating temperature range is -40°C to 85°C for industrial grade and 0°C to 70°C for commercial grade variants.

LT1113 Series (LT1113CS8#PBF, LT1113CS8#TRPBF) offers J-FET input configuration with supply voltage range of 9V to 40V, matching most OP275GS applications. These parts maintain -40°C to 85°C operating temperature range and active product status with full compliance certifications.

LT1169 Series (LT1169CS8#PBF, LT1169CS8#TRPBF) provides J-FET input amplifiers with 9V to 40V supply range and extremely low input bias current (4 pA). Operating temperature range is 0°C to 70°C, limiting use to commercial temperature applications.

All substitute parts are available in active product status with ROHS3 compliance and REACH unaffected certification, ensuring regulatory compliance and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can the OP275GSZ be used as a direct replacement for the OP275GS without circuit modifications?

A: Yes. The OP275GSZ is electrically identical to the OP275GS with matching slew rate (22V/µs), gain bandwidth product (9 MHz), input bias current (100 nA), input offset voltage (1 mV), supply current (4 mA), and output current per channel (90 mA). Both devices operate across the 9V to 44V supply range and share the 8-SOIC package. The only difference is packaging format (tube for OP275GSZ), which does not affect circuit performance or board-level compatibility.

Q: What is the primary limitation of the LT1057 series as a substitute?

A: The LT1057 series requires a minimum supply voltage of 20V, whereas the OP275GS operates from 9V. Applications using supply voltages between 9V and 20V cannot use the LT1057 series. For applications operating at 20V or higher, the LT1057 series offers superior input bias current performance (7 pA versus 100 nA).

Q: Are all substitute parts available in the same 8-SOIC package?

A: Yes. All substitute parts listed are housed in the 8-SOIC (0.154", 3.90mm Width) surface mount package, ensuring direct board-level compatibility without layout modifications or PCB redesign.

Q: Which substitute part offers the lowest input bias current?

A: The LT1169CS8#PBF and LT1169CS8#TRPBF offer the lowest input bias current at 4 pA, compared to 100 nA for the OP275GS. However, the LT1169 series operates only within the 0°C to 70°C commercial temperature range, limiting use to non-industrial applications.

Q: Can the ADA4075-2ARZ be used in applications requiring the full 44V maximum supply voltage?

A: No. The ADA4075-2ARZ maximum supply voltage is 36V, which is 8V below the OP275GS specification. Applications requiring operation at voltages between 36V and 44V must use the OP275GSZ or other substitutes with 44V maximum rating.

Q: What is the difference between tube and tape & reel packaging options?

A: Tube packaging is used for manual component handling and lower-volume assembly processes. Tape & reel packaging is used for automated pick-and-place assembly equipment. Both packaging formats contain identical electronic components with identical electrical specifications. Selection depends on assembly process requirements, not circuit performance.

Q: Are all substitute parts RoHS3 compliant?

A: All active substitute parts listed (OP275GSZ, ADA4075-2ARZ, LT1057 series, LT1113 series, LT1169 series) are ROHS3 compliant. The original OP275GS does not specify RoHS status due to its obsolete classification. For new designs and production, ROHS3-compliant substitutes ensure regulatory compliance with current environmental standards.

Q: Which substitute part maintains the highest slew rate?

A: The OP275GSZ maintains the highest slew rate at 22V/µs, identical to the original OP275GS. The ADA4075-2ARZ provides 12V/µs, while the LT1057 series provides 13V/µs. The LT1113 and LT1169 series provide lower slew rates of 3.9V/µs and 4.2V/µs respectively. Slew rate selection depends on signal bandwidth requirements and distortion specifications for the intended application.

Q: What is the operating temperature range difference between industrial and commercial grade LT1057 variants?

A: Industrial grade LT1057IS8 variants (LT1057IS8#PBF, LT1057IS8#TRPBF) operate across -40°C to 85°C. Commercial grade LT1057S8 variants (LT1057S8#PBF, LT1057S8#TRPBF) operate across 0°C to 70°C. Selection depends on the target application environment and thermal requirements.

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