OPA137U Equivalent & Substitute Parts Reference

Part Overview

The OPA137U is a J-FET input operational amplifier manufactured by Texas Instruments, designed for general-purpose linear amplification applications. This device is classified as Last Time Buy, indicating discontinued production with limited inventory availability. The OPA137U is packaged in 8-SOIC surface mount configuration and operates across industrial temperature ranges (-40°C to 85°C). Due to its Last Time Buy status, identifying functionally equivalent substitute components is essential for design continuity and long-term supply chain planning.

Key Parameters

Parameter	Value	Unit
Amplifier Type	J-FET	—
Number of Circuits	1	—
Slew Rate	3.5	V/µs
Gain Bandwidth Product	1	MHz
Current - Input Bias	5	pA
Voltage - Input Offset	1.5	mV
Current - Supply	220	µA
Current - Output / Channel	60	mA
Voltage - Supply Span (Min)	4.5	V
Voltage - Supply Span (Max)	36	V
Operating Temperature	-40 to 85	°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	3 (168 Hours)	—

Substitute Part Grouping Explanation

Substitution eligibility for the OPA137U is determined by the following critical parameters:

Package Compatibility: All substitute parts must use 8-SOIC surface mount packaging with identical 0.154" (3.90mm) width to ensure PCB footprint compatibility without layout redesign.

Electrical Performance Envelope: Substitute parts must operate within the supply voltage range of 4.5V to 36V and maintain functional performance across the -40°C to 85°C operating temperature range.

Circuit Configuration: Single-circuit operational amplifier topology is required for direct pin-for-pin replacement.

Compliance Requirements: All substitute parts must maintain ROHS3 compliance and EAR99 export classification to ensure regulatory alignment with the original component.

The OPA137UA/2K5 represents a direct manufacturer-recommended substitute from Texas Instruments, maintaining identical J-FET amplifier architecture and electrical specifications with the exception of packaging format (Tape & Reel versus Tube) and Active product status.

The ISL28177 family (ISL28177FBZ, ISL28177FBZ-T13, ISL28177FBZ-T7) from Renesas Electronics Corporation provides functional substitution through equivalent 8-SOIC packaging and compatible supply voltage range, though with different amplifier topology (General Purpose versus J-FET) and modified electrical characteristics.

Parameter Comparison

Parameter	OPA137U	OPA137UA/2K5	ISL28177FBZ	ISL28177FBZ-T13	ISL28177FBZ-T7
Manufacturer	Texas Instruments	Texas Instruments	Renesas Electronics	Renesas Electronics	Renesas Electronics
Amplifier Type	J-FET	J-FET	General Purpose	General Purpose	General Purpose
Number of Circuits	1	1	1	1	1
Slew Rate (V/µs)	3.5	3.5	0.2	0.2	0.2
Gain Bandwidth Product (MHz)	1	1	0.6	0.6	0.6
Current - Input Bias (pA)	5	5	200	200	200
Voltage - Input Offset (mV)	1.5	2.5	0.15	0.15	0.15
Current - Supply (µA)	220	220	1180	1180	1180
Current - Output / Channel (mA)	60	60	30	30	30
Voltage - Supply Span (Min)	4.5 V	4.5 V	6 V	6 V	6 V
Voltage - Supply Span (Max)	36 V	36 V	40 V	40 V	40 V
Operating Temperature (°C)	-40 to 85	-40 to 85	-40 to 125	-40 to 125	-40 to 125
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Packaging Format	Tube	Tape & Reel	Tube	Tape & Reel	Tape & Reel
Product Status	Last Time Buy	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	3 (168 Hours)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Substitute - OPA137UA/2K5: This Texas Instruments component is the manufacturer-recommended direct substitute for OPA137U. It maintains identical J-FET amplifier architecture, electrical performance specifications, and supply voltage range. The primary distinction is Active product status, ensuring long-term availability and supply continuity. Packaging format differs (Tape & Reel versus Tube), which affects procurement and handling but does not impact electrical performance or PCB integration. This substitute is appropriate for all applications currently using OPA137U without circuit modification.

Secondary Substitutes - ISL28177 Family: The Renesas Electronics ISL28177FBZ, ISL28177FBZ-T13, and ISL28177FBZ-T7 provide functional substitution through compatible 8-SOIC packaging and overlapping supply voltage specifications. These components employ General Purpose amplifier topology rather than J-FET architecture, resulting in modified electrical characteristics. The ISL28177 family exhibits reduced slew rate (0.2V/µs versus 3.5V/µs), lower gain bandwidth product (600 kHz versus 1 MHz), higher input bias current (200 pA versus 5 pA), and reduced output current capability (30 mA versus 60 mA). These devices offer extended operating temperature range (-40°C to 125°C) and superior moisture sensitivity rating (MSL 1 versus MSL 3). ISL28177 substitution is appropriate only for applications where the reduced performance envelope does not compromise circuit function. All ISL28177 variants maintain ROHS3 compliance and EAR99 classification.

Packaging Format Considerations: OPA137UA/2K5 is supplied in Tape & Reel format, while OPA137U is supplied in Tube format. ISL28177FBZ is supplied in Tube format; ISL28177FBZ-T13 and ISL28177FBZ-T7 are supplied in Tape & Reel format. Packaging format selection should align with procurement volume and assembly process requirements.

Frequently Asked Questions (FAQ)

Q: Can OPA137UA/2K5 replace OPA137U in existing designs without circuit modification?

A: Yes. OPA137UA/2K5 is the manufacturer-recommended substitute with identical electrical specifications, J-FET amplifier topology, and 8-SOIC packaging. Pin configuration and functional performance are equivalent. The only difference is packaging format (Tape & Reel versus Tube) and Active product status. No circuit redesign is required.

Q: What are the key differences between OPA137U and ISL28177 family substitutes?

A: The primary differences are amplifier topology (J-FET versus General Purpose), slew rate (3.5V/µs versus 0.2V/µs), gain bandwidth product (1 MHz versus 600 kHz), input bias current (5 pA versus 200 pA), and output current capability (60 mA versus 30 mA). ISL28177 devices offer extended temperature range (-40°C to 125°C) and improved moisture sensitivity (MSL 1). ISL28177 substitution requires verification that reduced performance specifications do not degrade circuit function.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. OPA137UA/2K5, ISL28177FBZ, ISL28177FBZ-T13, and ISL28177FBZ-T7 are all ROHS3 compliant and maintain EAR99 export classification, ensuring regulatory alignment with OPA137U.

Q: What is the difference between ISL28177FBZ, ISL28177FBZ-T13, and ISL28177FBZ-T7?

A: These three variants are electrically identical. The differences are packaging format and tape specifications. ISL28177FBZ is supplied in Tube format. ISL28177FBZ-T13 and ISL28177FBZ-T7 are supplied in Tape & Reel format with different tape specifications (T13 and T7 designations). Electrical performance and 8-SOIC package dimensions are identical across all three variants.

Q: Why does OPA137U have Last Time Buy status?

A: Last Time Buy status indicates that Texas Instruments has discontinued production of OPA137U. Existing inventory is limited to 3,600 pieces. OPA137UA/2K5 is the recommended long-term replacement with Active product status and higher inventory availability (7,155 pieces).

Q: Can ISL28177 devices operate at 4.5V supply voltage like OPA137U?

A: No. ISL28177 family devices require minimum 6V supply voltage, compared to OPA137U minimum of 4.5V. Applications requiring 4.5V operation must use OPA137U or OPA137UA/2K5. ISL28177 substitution is not appropriate for low-voltage applications below 6V.

Q: What is the moisture sensitivity difference between OPA137U and ISL28177?

A: OPA137U has MSL 3 (168 hours), requiring controlled storage and handling. ISL28177 family has MSL 1 (Unlimited), indicating superior moisture resistance and less stringent storage requirements. This provides supply chain and manufacturing advantages for ISL28177 devices.

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