OPA137PA Equivalent & Substitute Parts

Part Overview

The OPA137PA is a J-FET input operational amplifier manufactured by Texas Instruments, designed for general-purpose linear amplification applications. This device is packaged in an 8-DIP (0.300", 7.62mm) through-hole configuration and operates across a wide supply voltage range of 4.5V to 36V. The OPA137PA is classified as obsolete, making identification of functionally equivalent substitute components essential for design continuity, system maintenance, and component procurement in legacy and new applications requiring compatible performance characteristics.

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	2.5	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 Range	-40 to 85	°C
Mounting Type	Through Hole	—
Package / Case	8-DIP (0.300", 7.62mm)	—
Product Status	Obsolete	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the OPA137PA is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

Amplifier type and input stage technology (J-FET vs. general purpose)
Single-circuit configuration (1 circuit requirement)
Operating temperature range (-40°C to 85°C minimum)
Supply voltage span compatibility (minimum 4.5V to 36V range or subset thereof)
Slew rate and gain bandwidth product performance envelope
Input bias current and input offset voltage specifications
Output current capability (minimum 20 mA required)

Mechanical Compatibility Criteria:

Package type: 8-DIP through-hole or 8-SOIC surface mount
Pin count: 8 pins
Physical footprint compatibility for PCB layout

Compliance Criteria:

RoHS3 compliance
REACH unaffected status
EAR99 export classification

The OPA137UA represents a direct functional equivalent with identical electrical specifications but differs in mounting technology (surface mount 8-SOIC vs. through-hole 8-DIP). The TLC2654IP and TLE2021AIP are general-purpose amplifier alternatives that maintain through-hole 8-DIP packaging and operate within the required temperature range, though with different amplifier topologies and modified electrical characteristics within acceptable substitution parameters.

Parameter Comparison

Parameter	OPA137PA	OPA137UA	TLC2654IP	TLE2021AIP
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Amplifier Type	J-FET	J-FET	General Purpose	General Purpose
Number of Circuits	1	1	1	1
Slew Rate (V/µs)	3.5	3.5	3.7	0.65
Gain Bandwidth Product (MHz)	1	1	1.9	1.7
Current - Input Bias (pA)	5	5	50	25000
Voltage - Input Offset (mV)	2.5	2.5	0.005	0.08
Current - Supply (µA)	220	220	1500	240
Current - Output / Channel (mA)	60	60	50	20
Voltage - Supply Span Min (V)	4.5	4.5	4.6	4
Voltage - Supply Span Max (V)	36	36	16	40
Operating Temperature (°C)	-40 to 85	-40 to 85	-40 to 85	-40 to 85
Mounting Type	Through Hole	Surface Mount	Through Hole	Through Hole
Package / Case	8-DIP (0.300", 7.62mm)	8-SOIC (0.154", 3.90mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)
Product Status	Obsolete	Active	Last Time Buy	Last Time Buy
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

OPA137UA (Recommended Primary Substitute)

The OPA137UA is the manufacturer-recommended substitute for the OPA137PA. This device maintains identical electrical specifications including J-FET amplifier topology, 3.5V/µs slew rate, 1 MHz gain bandwidth product, 5 pA input bias current, and 2.5 mV input offset voltage. The OPA137UA operates across the full 4.5V to 36V supply range and maintains the -40°C to 85°C operating temperature specification. The primary distinction is packaging: OPA137UA uses 8-SOIC surface-mount technology versus the through-hole 8-DIP of the OPA137PA. This substitute is suitable for new PCB designs or rework applications where surface-mount assembly is available. The OPA137UA holds Active product status, ensuring long-term availability and supply chain continuity. RoHS3 compliance and REACH unaffected status are maintained.

TLC2654IP (Alternative Substitute for Through-Hole Applications)

The TLC2654IP provides functional substitution for applications requiring through-hole 8-DIP packaging identical to the OPA137PA. This general-purpose amplifier operates across -40°C to 85°C and maintains 8-DIP form factor compatibility. The TLC2654IP exhibits enhanced performance in specific parameters: 3.7V/µs slew rate (versus 3.5V/µs), 1.9 MHz gain bandwidth product (versus 1 MHz), and significantly lower input offset voltage of 5 µV (versus 2.5 mV). However, the TLC2654IP supply voltage span is limited to 4.6V to 16V, which is narrower than the OPA137PA's 4.5V to 36V range. Input bias current is 50 pA (versus 5 pA), and output current is 50 mA (versus 60 mA). Supply current consumption increases to 1.5 mA (versus 220 µA). The TLC2654IP is classified as Last Time Buy, indicating limited future availability. This substitute is appropriate for applications where the reduced supply voltage range is acceptable and where enhanced slew rate and bandwidth are beneficial.

TLE2021AIP (Alternative Substitute for Wide Supply Range)

The TLE2021AIP is a general-purpose amplifier alternative that maintains through-hole 8-DIP packaging and extends the maximum supply voltage to 40V (versus 36V maximum for OPA137PA). Operating temperature range remains -40°C to 85°C. The TLE2021AIP exhibits lower slew rate at 0.65V/µs (versus 3.5V/µs) and higher input bias current at 25 nA (versus 5 pA). Output current capability is reduced to 20 mA (versus 60 mA). Supply current is 240 µA, comparable to the OPA137PA. The TLE2021AIP is classified as Last Time Buy. This substitute is suitable for applications requiring extended high-voltage operation where reduced slew rate and lower output current are acceptable trade-offs.

Product Status Considerations

The OPA137PA is obsolete; the OPA137UA is the only active-status substitute. Both TLC2654IP and TLE2021AIP are Last Time Buy status, indicating these alternatives have limited procurement windows. For new designs requiring long-term component availability, the OPA137UA is the preferred selection despite packaging differences.

Frequently Asked Questions (FAQ)

Q: Can the OPA137UA directly replace the OPA137PA in existing PCB designs?

A: The OPA137UA cannot be directly soldered into through-hole 8-DIP sockets due to its 8-SOIC surface-mount package. However, electrical functionality is identical. Substitution requires either PCB rework to accommodate surface-mount assembly or use of an adapter carrier. For new designs, the OPA137UA is recommended.

Q: What is the primary difference between the OPA137PA and OPA137UA?

A: The electrical specifications are identical. The OPA137UA uses 8-SOIC surface-mount packaging (0.154" width) versus the OPA137PA's 8-DIP through-hole packaging (0.300" width). The OPA137UA also has MSL rating of 3 (168 hours) versus MSL 1 (unlimited) for the OPA137PA.

Q: Is the TLC2654IP suitable for applications requiring the full 4.5V to 36V supply range of the OPA137PA?

A: No. The TLC2654IP maximum supply voltage is 16V, which is insufficient for applications requiring operation above 16V. The TLC2654IP is suitable only for applications operating within the 4.6V to 16V range.

Q: Why does the TLE2021AIP have significantly higher input bias current than the OPA137PA?

A: The TLE2021AIP uses general-purpose amplifier topology with bipolar input stages, resulting in input bias current of 25 nA. The OPA137PA uses J-FET input technology, which inherently produces much lower input bias current of 5 pA. This difference affects high-impedance signal source applications.

Q: Can I use the TLC2654IP or TLE2021AIP in a design originally specified for the OPA137PA?

A: Substitution is possible only if the application requirements fall within the electrical and supply voltage specifications of the alternative device. The TLC2654IP requires supply voltage ≤16V. The TLE2021AIP requires output current ≤20 mA and can tolerate the lower slew rate of 0.65V/µs. Detailed circuit analysis is necessary to confirm compatibility.

Q: What is the significance of "Last Time Buy" status for TLC2654IP and TLE2021AIP?

A: Last Time Buy status indicates these components are in final production phases with limited future availability. Procurement windows are restricted. For applications requiring long-term component supply, the OPA137UA (Active status) is the preferred substitute.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. The OPA137UA, TLC2654IP, and TLE2021AIP are all ROHS3 compliant and REACH unaffected, maintaining environmental and regulatory compliance equivalent to the OPA137PA.

Q: Which substitute is recommended for new PCB designs?

A: The OPA137UA is the manufacturer-recommended substitute for new designs. It maintains identical electrical specifications and active product status, ensuring long-term availability and supply chain reliability.

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