OP27GS Equivalent & Substitute Parts

Part Overview

The OP27GS 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, though 1,886 units remain in stock as new original inventory. The OP27GS operates across a wide supply voltage range of 8V to 36V and maintains performance across the industrial temperature range of -40°C to 85°C. Due to its obsolete status, identifying equivalent and substitute parts is necessary for design continuity, long-term availability assurance, and production planning.

Key Parameters

Parameter	OP27GS Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	1	—
Slew Rate	2.8	V/µs
Gain Bandwidth Product	8	MHz
Current - Input Bias	15	nA
Voltage - Input Offset	30	µV
Voltage - Supply Span (Min)	8	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

Substitution of the OP27GS is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

Slew Rate: 2.8 V/µs (OP27GS baseline)
Gain Bandwidth Product: 8 MHz (OP27GS baseline)
Input Bias Current: 15 nA (OP27GS baseline)
Input Offset Voltage: 30 µV (OP27GS baseline)
Supply Voltage Range: 8V to 36V minimum (OP27GS baseline)
Operating Temperature Range: -40°C to 85°C (OP27GS baseline)

Mechanical Compatibility Criteria:

Mounting Type: Surface Mount
Package Type: 8-SOIC (0.154", 3.90mm Width)
Number of Circuits: 1

Substitute parts are grouped into two categories:

Category 1: Direct Equivalents — Parts with identical electrical specifications and packaging. These parts maintain the exact performance envelope of the OP27GS and require no circuit redesign.

Category 2: Functional Alternatives — Parts with different electrical specifications (higher slew rate, higher bandwidth, different input offset voltage, or different temperature range) but compatible packaging and supply voltage range. These parts may be used in applications where the OP27GS specifications exceed design requirements, or where enhanced performance is acceptable.

Parameter Comparison

Part Number	Manufacturer	Product Status	Slew Rate (V/µs)	Gain Bandwidth (MHz)	Input Bias (nA)	Input Offset (µV)	Supply Min (V)	Supply Max (V)	Temp Range (°C)	Package	Packaging Type
OP27GS	Analog Devices Inc.	Obsolete	2.8	8	15	30	8	36	-40 to 85	8-SOIC	Tube
OP27GSZ	Analog Devices Inc.	Active	2.8	8	15	30	8	36	-40 to 85	8-SOIC	Tube
LT1037CS8#PBF	Analog Devices Inc.	Active	15	60	15	20	8	36	0 to 70	8-SOIC	Tube
LT1037CS8#TRPBF	Analog Devices Inc.	Active	15	60	15	20	8	36	0 to 70	8-SOIC	Tape & Reel
LT1037IS8	Analog Devices Inc.	Active	15	60	15	20	8	36	-40 to 85	8-SOIC	Tube
LT1037IS8#PBF	Analog Devices Inc.	Active	15	60	15	20	8	36	-40 to 85	8-SOIC	Tube
OP07CS8#PBF	Analog Devices Inc.	Active	0.25	0.6	1.8	60	6	36	0 to 70	8-SOIC	Tube
OP07CS8#TRPBF	Analog Devices Inc.	Active	0.25	0.6	1.8	60	6	36	0 to 70	8-SOIC	Tape & Reel
OPA227U	Texas Instruments	Active	2.3	8	2.5	5	5	36	-40 to 85	8-SOIC	Tube
OPA227U/2K5	Texas Instruments	Active	2.3	8	2.5	5	5	36	-40 to 85	8-SOIC	Tape & Reel
OPA227UA	Texas Instruments	Active	2.3	8	2.5	10	5	36	-40 to 85	8-SOIC	Tube

Engineering Selection Recommendations

Direct Equivalent (Recommended Primary Substitute):

The OP27GSZ is the direct equivalent to the OP27GS. It maintains identical electrical specifications (2.8 V/µs slew rate, 8 MHz gain bandwidth product, 15 nA input bias current, 30 µV input offset voltage) and operates across the same supply voltage range (8V to 36V) and temperature range (-40°C to 85°C). The OP27GSZ is currently in active production status with 55,200 units in stock, ensuring long-term availability. The OP27GSZ carries RoHS3 compliance and REACH Unaffected status, meeting modern environmental and regulatory requirements. This part is suitable for direct replacement in all applications currently using the OP27GS without circuit modification.

Active Alternatives with Enhanced Performance:

The LT1037IS8 and LT1037IS8#PBF offer enhanced performance characteristics while maintaining the full industrial temperature range (-40°C to 85°C) required by the OP27GS. These parts feature a 15 V/µs slew rate (5.4× faster than OP27GS) and 60 MHz gain bandwidth product (7.5× higher than OP27GS), with lower input offset voltage (20 µV versus 30 µV). Both maintain 8-SOIC packaging and 8V to 36V supply voltage compatibility. These parts are suitable for applications where improved transient response and bandwidth are beneficial.

The OPA227U, OPA227U/2K5, and OPA227UA from Texas Instruments provide comparable performance to the OP27GS with 2.3 V/µs slew rate and 8 MHz gain bandwidth product. These parts feature superior input bias current (2.5 nA versus 15 nA) and lower input offset voltage (5 µV to 10 µV versus 30 µV). The OPA227 series operates across -40°C to 85°C and accepts supply voltages from 5V to 36V, providing broader low-voltage compatibility. All OPA227 variants carry RoHS3 compliance and REACH Unaffected status.

Limited-Temperature Alternatives:

The LT1037CS8#PBF and LT1037CS8#TRPBF are functionally similar to the LT1037IS8 series but operate only across 0°C to 70°C. These parts are suitable only for applications where the full industrial temperature range is not required.

The OP07CS8#PBF and OP07CS8#TRPBF represent a different performance class with significantly lower slew rate (0.25 V/µs) and bandwidth (600 kHz). These parts are suitable only for low-frequency, precision applications where the OP27GS performance exceeds requirements. The OP07 series operates across 0°C to 70°C and requires minimum 6V supply voltage.

Frequently Asked Questions (FAQ)

Q: Can I use OP27GSZ as a direct replacement for OP27GS?

A: Yes. The OP27GSZ is electrically and mechanically identical to the OP27GS. Both devices feature 2.8 V/µs slew rate, 8 MHz gain bandwidth product, 15 nA input bias current, and 30 µV input offset voltage. Both operate across 8V to 36V supply voltage and -40°C to 85°C temperature range in 8-SOIC packaging. The OP27GSZ is currently in active production with significantly higher inventory availability.

Q: What is the difference between OP27GSZ and LT1037IS8?

A: The LT1037IS8 offers enhanced performance with 15 V/µs slew rate (versus 2.8 V/µs) and 60 MHz gain bandwidth product (versus 8 MHz). Input offset voltage is lower at 20 µV versus 30 µV. Both maintain 8-SOIC packaging and -40°C to 85°C operation. The LT1037IS8 is suitable for applications requiring faster transient response and higher bandwidth. Circuit redesign is not required due to compatible pinout and supply voltage range.

Q: Can I substitute OPA227U for OP27GS?

A: The OPA227U is functionally compatible with the OP27GS in most applications. Both feature comparable slew rate (2.3 V/µs versus 2.8 V/µs) and identical 8 MHz gain bandwidth product. The OPA227U offers superior input characteristics with 2.5 nA input bias current and 5 µV input offset voltage. The OPA227U operates across -40°C to 85°C and accepts 5V to 36V supply voltage, providing broader low-voltage capability. No circuit modification is required.

Q: Why do some substitute parts have different temperature ranges?

A: The OP27GS operates across the full industrial temperature range of -40°C to 85°C. Some substitute parts, such as LT1037CS8#PBF and OP07CS8#PBF, are rated only for 0°C to 70°C. These parts are suitable only for applications where operation is guaranteed within this narrower range. For applications requiring full industrial temperature coverage, select parts explicitly rated for -40°C to 85°C operation.

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

A: Tube packaging (standard) is suitable for manual assembly and small-volume production. Tape & Reel (TR) packaging is optimized for automated pick-and-place assembly equipment and high-volume manufacturing. Both packaging types contain identical electronic components. Selection depends on production methodology and assembly equipment capability.

Q: Are all substitute parts RoHS3 compliant?

A: All active substitute parts listed (OP27GSZ, LT1037 series, OP07 series, OPA227 series) carry RoHS3 compliance certification. The obsolete OP27GS does not specify RoHS status. For applications requiring RoHS3 compliance, select any of the active substitute parts.

Q: Can I use OP07CS8#PBF as a substitute for OP27GS?

A: The OP07CS8#PBF is not recommended as a direct substitute. While both are general-purpose operational amplifiers in 8-SOIC packaging, the OP07 features significantly different performance characteristics: 0.25 V/µs slew rate (versus 2.8 V/µs), 600 kHz bandwidth (versus 8 MHz), and 60 µV input offset voltage (versus 30 µV). The OP07 is designed for precision, low-frequency applications. Additionally, the OP07 operates only across 0°C to 70°C and requires minimum 6V supply voltage. Use the OP07 only in applications where these specifications are appropriate.

Q: What inventory considerations should I evaluate?

A: The OP27GS is obsolete with 1,886 units in stock. The OP27GSZ direct equivalent has 55,200 units available. The LT1037 series variants have 1,300 to 3,845 units in stock. The OPA227 series variants have 1,655 to 5,593 units in stock. For long-term production planning, the OP27GSZ and OPA227 series offer superior inventory depth and active production status.

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