OPA2131UAE4 Equivalent & Substitute Parts

Part Overview

The OPA2131UAE4 is a J-FET input operational amplifier featuring dual circuits in an 8-SOIC surface mount package, manufactured by Texas Instruments. This device is classified as obsolete product status. The OPA2131UAE4 operates across a wide supply voltage range of 9V to 36V with low input bias current of 5 pA and input offset voltage of 200 µV. Due to its obsolete status, identifying equivalent and substitute parts is essential for design continuity, production planning, and long-term component availability assurance.

Key Parameters

Parameter	Value
Manufacturer Part Number	OPA2131UAE4
Manufacturer	Texas Instruments
Category	Linear, Amplifiers
Amplifier Type	J-FET
Number of Circuits	2
Package / Case	8-SOIC (0.154", 3.90mm Width)
Slew Rate	10 V/µs
Gain Bandwidth Product	4 MHz
Current - Input Bias	5 pA
Voltage - Input Offset	200 µV
Current - Supply	1.5 mA (x2 Channels)
Current - Output / Channel	25 mA
Voltage - Supply Span (Min)	9 V
Voltage - Supply Span (Max)	36 V
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the OPA2131UAE4 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Amplifier Type: J-FET input configuration
Number of Circuits: Dual (2 circuits)
Package / Case: 8-SOIC form factor with 0.154" (3.90mm) width
Mounting Type: Surface Mount
Voltage - Supply Span: Minimum 9V to Maximum 36V overlap
Operating Temperature Range: Compatibility with -40°C ~ 85°C or extended range

Secondary Compatibility Parameters:

Slew Rate: 10 V/µs or higher
Gain Bandwidth Product: 4 MHz or higher
Current - Input Bias: 5 pA or lower
Voltage - Input Offset: 200 µV or lower
Current - Supply: 1.5 mA per channel or lower
Current - Output / Channel: 25 mA or higher

Substitute parts are grouped into two categories based on their electrical performance relative to the OPA2131UAE4:

Category A - Direct Functional Equivalents (Active Status): Parts that maintain identical or superior electrical specifications while offering active product status and improved availability. OPA2131UA represents the direct successor from Texas Instruments with identical electrical characteristics but active product status.

Category B - Enhanced Performance Substitutes (Active Status): Parts that exceed the OPA2131UAE4 specifications in key performance metrics such as slew rate, gain bandwidth product, or output current capability, while maintaining 8-SOIC packaging and J-FET input architecture. These include AD8512ARZ variants and ADA4000-2ARZ series.

Category C - Low-Power Alternatives (Active Status): Parts optimized for reduced power consumption while maintaining core J-FET amplifier functionality and 8-SOIC packaging. AD8682ARZ variants represent this category with significantly reduced supply current.

Parameter Comparison

Parameter	OPA2131UAE4	OPA2131UA	AD712KRZ-REEL7	AD8512ARZ	AD8512ARZ-REEL7	AD8682ARZ	ADA4000-2ARZ
Manufacturer	Texas Instruments	Texas Instruments	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
Amplifier Type	J-FET	J-FET	J-FET	J-FET	J-FET	J-FET	J-FET
Number of Circuits	2	2	2	2	2	2	2
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Slew Rate (V/µs)	10	10	20	20	20	9	20
Gain Bandwidth Product (MHz)	4	4	4	8	8	3.5	5
Current - Input Bias (pA)	5	5	25	25	25	6	5
Voltage - Input Offset (µV)	200	200	300	100	100	350	200
Current - Supply (mA x2 Channels)	1.5	1.5	5	2.2	2.2	0.21	1.35
Current - Output / Channel (mA)	25	25	25	70	70	12	28
Voltage - Supply Span (Min)	9 V	9 V	9 V	10 V	10 V	9 V	8 V
Voltage - Supply Span (Max)	36 V	36 V	36 V	30 V	30 V	36 V	36 V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	0°C ~ 70°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 125°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	3 (168 Hours)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For Direct Replacement with Identical Specifications:

OPA2131UA is the recommended primary substitute. This part maintains identical electrical specifications to the OPA2131UAE4 across all critical parameters including slew rate, gain bandwidth product, input bias current, input offset voltage, and supply current. The OPA2131UA carries active product status with significantly higher inventory availability (26,518 units in stock versus 788 units for the obsolete OPA2131UAE4). Both parts share identical 8-SOIC packaging, operating temperature range of -40°C to 85°C, and ROHS3 compliance. The transition from OPA2131UAE4 to OPA2131UA requires no circuit modifications and provides immediate design continuity.

For Enhanced Performance Applications:

AD8512ARZ and AD8512ARZ-REEL7 offer superior performance characteristics with doubled gain bandwidth product (8 MHz versus 4 MHz) and doubled slew rate (20 V/µs versus 10 V/µs). These parts provide extended operating temperature range to 125°C and improved output current capability (70 mA versus 25 mA per channel). However, the maximum supply voltage is reduced to 30V (from 36V), and minimum supply voltage increases to 10V (from 9V). These parts are suitable for applications requiring higher bandwidth and faster transient response within the 10V to 30V supply range.

For Low-Power Applications:

AD8682ARZ and AD8682ARZ-REEL7 deliver ultra-low supply current of 210 µA per dual channel (compared to 1.5 mA for OPA2131UAE4), representing a 7-fold reduction in power consumption. These parts maintain the full 9V to 36V supply range and -40°C to 85°C operating temperature compatibility. Trade-offs include slightly reduced slew rate (9 V/µs), lower gain bandwidth product (3.5 MHz), and reduced output current (12 mA per channel). MSL rating improves to 1 (Unlimited) for enhanced moisture tolerance. Selection of AD8682ARZ variants is appropriate for battery-powered or power-constrained applications.

For Extended Temperature Range:

ADA4000-2ARZ and ADA4000-2ARZ-R7 extend operating temperature to 125°C while maintaining the original OPA2131UAE4 input bias current specification of 5 pA and input offset voltage of 200 µV. These parts offer improved slew rate (20 V/µs) and higher gain bandwidth product (5 MHz). Supply voltage range is 8V to 36V, providing lower minimum voltage threshold. MSL rating is 1 (Unlimited). These parts are suitable for industrial and automotive applications requiring extended temperature operation.

All substitute parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory compatibility with the original OPA2131UAE4.

Frequently Asked Questions (FAQ)

Q1: Can OPA2131UA be used as a direct drop-in replacement for OPA2131UAE4?

A: Yes. OPA2131UA is electrically and mechanically identical to OPA2131UAE4. Both parts feature J-FET input architecture, dual circuits in 8-SOIC packaging, identical slew rate (10 V/µs), gain bandwidth product (4 MHz), input bias current (5 pA), input offset voltage (200 µV), and supply current (1.5 mA per channel). Operating temperature range, supply voltage range (9V to 36V), and output current (25 mA per channel) are identical. No circuit modifications are required. The primary advantage is OPA2131UA's active product status and superior availability.

Q2: What are the key differences between AD8512ARZ and OPA2131UAE4?

A: AD8512ARZ provides enhanced performance with doubled slew rate (20 V/µs versus 10 V/µs) and doubled gain bandwidth product (8 MHz versus 4 MHz). Input offset voltage is improved to 100 µV (versus 200 µV). Output current capability increases to 70 mA per channel (versus 25 mA). Operating temperature range extends to 125°C. However, maximum supply voltage is limited to 30V (versus 36V), and minimum supply voltage increases to 10V (versus 9V). Supply current increases to 2.2 mA per channel. These trade-offs make AD8512ARZ suitable for high-speed applications within the 10V to 30V supply range.

Q3: Is AD8682ARZ suitable for battery-powered applications?

A: Yes. AD8682ARZ consumes only 210 µA per dual channel, representing a 7-fold reduction compared to OPA2131UAE4's 1.5 mA per channel. This ultra-low supply current makes AD8682ARZ ideal for battery-powered and energy-harvesting applications. The part maintains the full 9V to 36V supply range and -40°C to 85°C operating temperature compatibility with OPA2131UAE4. Trade-offs include slightly reduced slew rate (9 V/µs), lower gain bandwidth product (3.5 MHz), and reduced output current (12 mA per channel). MSL rating improves to 1 (Unlimited), providing better moisture tolerance for extended storage.

Q4: What packaging options are available for substitute parts?

A: All substitute parts maintain the 8-SOIC (0.154", 3.90mm width) surface mount package format. Packaging variations relate to delivery format: Tube packaging (standard), Cut Tape (CT) & Digi-Reel® format, and Tape & Reel (TR) format. These variations do not affect electrical or mechanical compatibility. Selection depends on production volume and assembly line requirements. OPA2131UA is available in Tube packaging. AD8512ARZ variants are available in both Tube and Cut Tape & Digi-Reel® formats. AD8682ARZ variants are available in Tube, standard Reel, and Digi-Reel® formats. ADA4000-2ARZ variants are available in Tube and Cut Tape & Digi-Reel® formats.

Q5: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed—OPA2131UA, AD712KRZ-REEL7, AD8512ARZ variants, AD8682ARZ variants, and ADA4000-2ARZ variants—are ROHS3 compliant. All parts are REACH unaffected. This ensures regulatory compliance with environmental and hazardous substance restrictions applicable to the original OPA2131UAE4.

Q6: Which substitute part is recommended for industrial temperature applications?

A: ADA4000-2ARZ and ADA4000-2ARZ-R7 are recommended for industrial applications requiring extended temperature operation. These parts operate across -40°C to 125°C, compared to OPA2131UAE4's -40°C to 85°C range. ADA4000-2ARZ maintains the original input bias current specification of 5 pA and input offset voltage of 200 µV. Slew rate improves to 20 V/µs, and gain bandwidth product increases to 5 MHz. Supply voltage range is 8V to 36V. MSL rating is 1 (Unlimited), providing superior moisture tolerance for industrial environments.

Q7: What is the inventory status of substitute parts?

A: OPA2131UA offers the highest inventory availability with 26,518 units in stock. AD8512ARZ-REEL7 has 30,300 units available. AD8512ARZ-REEL has 16,600 units. AD712KRZ-REEL7 has 17,285 units. ADA4000-2ARZ has 3,209 units. AD8682ARZ has 3,800 units. AD8682ARZ-REEL has 3,400 units. AD8682ARZ-REEL7 has 1,029 units. All substitute parts carry active product status, ensuring long-term availability compared to the obsolete OPA2131UAE4 (788 units remaining in stock).

Q8: Can AD712KRZ-REEL7 replace OPA2131UAE4 in all applications?

A: AD712KRZ-REEL7 is compatible with OPA2131UAE4 for applications operating within 0°C to 70°C temperature range. This part maintains J-FET input architecture, dual circuits, and 8-SOIC packaging. Slew rate improves to 20 V/µs, and supply voltage range is 9V to 36V. However, operating temperature range is restricted to 0°C to 70°C (versus -40°C to 85°C for OPA2131UAE4), making it unsuitable for applications requiring full military or extended low-temperature operation. Input bias current increases to 25 pA, and supply current increases to 5 mA per channel. MSL rating improves to 1 (Unlimited).

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