OPA131U Equivalent & Substitute Parts Reference

Part Overview

The OPA131U is a general-purpose operational amplifier manufactured by Texas Instruments, housed in an 8-SOIC surface mount package. This device is classified as Active product status and is ROHS3 compliant. The OPA131U serves applications requiring low-power, general-purpose amplification with moderate bandwidth and slew rate characteristics. Substitute parts are identified when equivalent electrical performance parameters and identical mechanical packaging are available from alternative manufacturers, enabling design flexibility and supply chain optimization.

Key Parameters

Parameter	OPA131U Value	Unit	Substitution Relevance
Amplifier Type	General Purpose	—	Critical
Number of Circuits	1	—	Critical
Slew Rate	10	V/µs	Critical
Gain Bandwidth Product	4	MHz	Critical
Current - Input Bias	5	pA	Important
Voltage - Input Offset	200	µV	Important
Current - Supply	1.5	mA	Important
Current - Output / Channel	25	mA	Important
Voltage - Supply Span (Min)	9	V	Critical
Voltage - Supply Span (Max)	36	V	Critical
Operating Temperature	-40 to 85	°C	Important
Package / Case	8-SOIC (0.154", 3.90mm Width)	—	Critical
Mounting Type	Surface Mount	—	Critical
RoHS Status	ROHS3 Compliant	—	Important

Substitute Part Grouping Explanation

Substitute parts are grouped based on strict adherence to the following electrical and mechanical criteria:

Critical Matching Parameters:

Package / Case: 8-SOIC (0.154", 3.90mm Width)
Mounting Type: Surface Mount
Number of Circuits: 1
Voltage - Supply Span: Minimum 9V, Maximum 36V

Performance Parameters for Substitution Compatibility:

Slew Rate: 10 V/µs or greater
Gain Bandwidth Product: 4 MHz or greater
Current - Output / Channel: 25 mA or greater
Operating Temperature Range: Must encompass or exceed -40°C to 85°C

Compliance Requirements:

RoHS3 Compliant
REACH Unaffected
ECCN: EAR99

All substitute parts listed meet these criteria. Variations in amplifier type (J-FET vs. General Purpose), input bias current, input offset voltage, and supply current are documented in the parameter comparison table for engineering evaluation.

Parameter Comparison

Parameter	OPA131U	AD711KRZ	AD795JRZ	AD8510BRZ	ADA4000-1ARZ	LT1055S8#PBF
Manufacturer	Texas Instruments	Analog Devices	Analog Devices	Analog Devices	Analog Devices	Analog Devices
Amplifier Type	General Purpose	J-FET	J-FET	J-FET	J-FET	J-FET
Slew Rate (V/µs)	10	20	1	20	20	12
Gain Bandwidth Product (MHz)	4	4	1.6	8	5	4.5
Current - Input Bias (pA)	5	15	1	25	5	30
Voltage - Input Offset (µV)	200	200	100	80	200	500
Current - Supply (mA)	1.5	2.5	1.3	2.2	1.35	2.8
Current - Output / Channel (mA)	25	25	10	70	28	—
Voltage - Supply Span (Min, V)	9	9	8	9	8	10
Voltage - Supply Span (Max, V)	36	36	36	36	36	36
Operating Temperature (°C)	-40 to 85	0 to 70	0 to 70	-40 to 125	-40 to 125	0 to 70
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
RoHS Status	ROHS3	ROHS3	ROHS3	ROHS3	ROHS3	ROHS3

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

AD711KRZ and AD711KRZ-REEL7 provide direct electrical equivalence with identical slew rate (20 V/µs exceeds 10 V/µs requirement), matching gain bandwidth product (4 MHz), and identical supply voltage range (9V to 36V). These parts are ROHS3 compliant and REACH unaffected. The primary difference is amplifier type classification (J-FET vs. General Purpose) and operating temperature range (0°C to 70°C vs. -40°C to 85°C). Selection of AD711KRZ-REEL7 provides higher inventory availability (7628 pcs) in Cut Tape & Digi-Reel packaging.

ADA4000-1ARZ and ADA4000-1ARZ-R7 offer superior performance with 20 V/µs slew rate, 5 MHz gain bandwidth product, and extended operating temperature range (-40°C to 125°C). Supply voltage minimum is 8V, which is compatible with 9V minimum requirement. These parts are ROHS3 compliant and REACH unaffected. The ADA4000-1ARZ-R7 variant provides reel packaging with 2394 pcs inventory.

LT1055S8#PBF and LT1055S8#TRPBF provide 12 V/µs slew rate and 4.5 MHz gain bandwidth product, both exceeding OPA131U specifications. Supply voltage minimum is 10V, which is above the 9V requirement. Operating temperature range is 0°C to 70°C. These parts are ROHS3 compliant and REACH unaffected.

Secondary Substitutes (Performance Trade-offs):

AD795JRZ and AD795JRZ-REEL7 feature reduced slew rate (1 V/µs) and lower gain bandwidth product (1.6 MHz), both below OPA131U specifications. Output current per channel is 10 mA, below the 25 mA requirement. These parts are suitable only for applications with relaxed bandwidth and slew rate requirements. Operating temperature range is 0°C to 70°C. Supply voltage minimum is 8V.

AD8510BRZ and AD8510BRZ-REEL7 provide enhanced performance with 20 V/µs slew rate, 8 MHz gain bandwidth product, and 70 mA output current per channel. Extended operating temperature range (-40°C to 125°C) exceeds OPA131U specifications. These parts are ROHS3 compliant and REACH unaffected. Selection is appropriate for applications requiring higher output current and extended temperature operation.

Compliance Verification:

All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the OPA131U regulatory classification. All parts carry ECCN EAR99 designation. Moisture sensitivity levels vary; AD711KRZ, AD795JRZ, AD8510BRZ, and ADA4000-1ARZ variants specify MSL 1 (Unlimited), while OPA131U specifies MSL 3 (168 Hours).

Frequently Asked Questions (FAQ)

Q: Can AD795JRZ substitute for OPA131U in all applications?

A: No. AD795JRZ exhibits reduced slew rate (1 V/µs vs. 10 V/µs) and lower gain bandwidth product (1.6 MHz vs. 4 MHz). Output current per channel is 10 mA, below the 25 mA specification. This part is suitable only for applications with relaxed dynamic performance requirements.

Q: What is the primary difference between AD711KRZ and AD711KRZ-REEL7?

A: Both parts are electrically identical. The difference is packaging format: AD711KRZ is supplied in Tube packaging (1313 pcs inventory), while AD711KRZ-REEL7 is supplied in Cut Tape & Digi-Reel format (7628 pcs inventory). Selection depends on assembly process requirements and inventory availability.

Q: Does operating temperature range affect substitution suitability?

A: Operating temperature range is an important parameter. OPA131U operates from -40°C to 85°C. Substitute parts with narrower ranges (0°C to 70°C) are not suitable for applications requiring full -40°C to 85°C operation. Parts with extended ranges (-40°C to 125°C) are suitable for all OPA131U applications and additional extended-temperature applications.

Q: Are all substitute parts pin-compatible with OPA131U?

A: All substitute parts use 8-SOIC package with identical 0.154" (3.90mm) width. Pin count and spacing are identical. However, electrical characteristics differ; circuit design validation is required before substitution.

Q: What is the significance of J-FET amplifier type versus General Purpose?

A: J-FET amplifiers feature extremely low input bias current (1 to 30 pA range) compared to general-purpose designs. This characteristic is beneficial for high-impedance input applications. OPA131U is classified as General Purpose with 5 pA input bias current. J-FET substitutes provide superior input bias characteristics for applications sensitive to input leakage current.

Q: Can LT1055S8#PBF be used in applications requiring 9V minimum supply voltage?

A: No. LT1055S8#PBF specifies 10V minimum supply voltage. Applications requiring 9V operation must use parts with 9V or lower minimum specification: OPA131U, AD711KRZ, AD8510BRZ, or ADA4000-1ARZ.

Q: What packaging options are available for substitute parts?

A: Substitute parts are available in three packaging formats: Tube (standard packaging), Cut Tape & Digi-Reel (automated assembly), and Tape & Reel (high-volume production). All maintain identical 8-SOIC mechanical specifications. Selection depends on assembly process and volume requirements.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, matching OPA131U regulatory status. Moisture sensitivity levels vary; consult specific part datasheets for storage and handling requirements.

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