OPA4137U Equivalent & Substitute Parts

Part Overview

The OPA4137U is a J-FET input operational amplifier manufactured by Texas Instruments, configured as a 4-circuit integrated circuit in 14-SOIC surface mount packaging. This device is classified as Last Time Buy, indicating discontinued production status. The OPA4137U operates across a wide supply voltage range of 4.5 V to 36 V with low input bias current of 5 pA, making it suitable for precision signal conditioning and low-noise amplification applications. Due to its Last Time Buy status, identification of functionally equivalent substitute components is necessary for design continuity and long-term supply chain management.

Key Parameters

Parameter	Value	Unit
Amplifier Type	J-FET	—
Number of Circuits	4	—
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	14-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 of the OPA4137U is determined by strict alignment of electrical and mechanical parameters. The primary substitution criteria are:

Critical Parameters for Substitution:

Number of circuits: 4 (quad configuration required)
Package type: 14-SOIC surface mount (0.154", 3.90mm width)
Supply voltage range: Minimum 4.5 V, Maximum 36 V
Input bias current: 5 pA or lower
Operating temperature range: -40°C to 85°C or wider
Mounting type: Surface Mount

Substitution Categories:

Category 1: Direct Manufacturer Equivalent (Packaging Variant) OPA4137U/2K5 is the tape and reel packaging variant of the same base product (OPA4137) from Texas Instruments. This part maintains identical electrical specifications and is the primary recommended substitute due to Active product status and higher inventory availability.

Category 2: Alternative Amplifier Types with Compatible Parameters Parts including ADA4004-4ARZ-R7, ADA4004-4ARZ-RL, BA14741F-E2, ISL55004IBZ-T13, LM124DT, LM224ADT, LM224D, LM224DT, and LM248DT are functionally equivalent based on matching the 4-circuit configuration, 14-SOIC packaging, and supply voltage compatibility. These parts differ in amplifier topology (General Purpose, Voltage Feedback) and specific electrical characteristics but operate within the same mechanical and electrical envelope.

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Slew Rate (V/µs)	GBW (MHz)	Input Bias (pA/nA)	Supply Min (V)	Supply Max (V)	Temp Range (°C)	Package	Status
OPA4137U	Texas Instruments	J-FET	3.5	1	5 pA	4.5	36	-40 to 85	14-SOIC	Last Time Buy
OPA4137U/2K5	Texas Instruments	J-FET	3.5	1	5 pA	4.5	36	-40 to 85	14-SOIC	Active
ADA4004-4ARZ-R7	Analog Devices Inc.	General Purpose	2.7	12	40 nA	10	30	-40 to 125	14-SOIC	Active
ADA4004-4ARZ-RL	Analog Devices Inc.	General Purpose	2.7	12	40 nA	10	30	-40 to 125	14-SOIC	Active
BA14741F-E2	Rohm Semiconductor	General Purpose	1	2	60 nA	4	36	-40 to 85	14-SOP	Active
ISL55004IBZ-T13	Renesas Electronics	Voltage Feedback	300	70	600 nA	4.5	30	-40 to 85	14-SOIC	Active
LM124DT	STMicroelectronics	General Purpose	0.4	1.3	20 nA	3	30	-55 to 125	14-SOIC	Active
LM224ADT	STMicroelectronics	General Purpose	0.4	1.3	20 nA	3	30	-40 to 105	14-SOIC	Active
LM224D	STMicroelectronics	General Purpose	0.4	1.2	20 nA	3	30	-40 to 105	14-SOIC	Active
LM224DT	STMicroelectronics	General Purpose	0.4	1.3	20 nA	3	30	-40 to 105	14-SOIC	Active
LM248DT	STMicroelectronics	General Purpose	0.5	1.3	30 nA	44	44	-40 to 105	14-SOIC	Active

Engineering Selection Recommendations

Primary Recommendation: OPA4137U/2K5

The OPA4137U/2K5 is the optimal substitute for the OPA4137U. This part is the tape and reel packaging variant of the identical base product OPA4137 from Texas Instruments. It maintains 100% electrical and mechanical compatibility with the original OPA4137U, differing only in packaging format (Tape & Reel versus Tube). The OPA4137U/2K5 carries Active product status with significantly higher inventory availability (9410 units in stock versus 2295 units for the original). Both parts are ROHS3 Compliant and REACH Unaffected, with identical moisture sensitivity levels and operating specifications.

Secondary Recommendations for Extended Supply Chain Options:

For applications requiring long-term supply assurance beyond the OPA4137U/2K5 availability, the following alternatives are qualified substitutes:

ADA4004-4ARZ-R7 and ADA4004-4ARZ-RL (Analog Devices Inc.) are Active status quad operational amplifiers in 14-SOIC packaging. These parts provide higher gain bandwidth product (12 MHz versus 1 MHz) and extended operating temperature range (-40°C to 125°C). The supply voltage range is 10 V to 30 V, which is narrower than the OPA4137U (4.5 V to 36 V). Input bias current is 40 nA, higher than the OPA4137U specification of 5 pA. These parts are suitable for applications where the higher bandwidth and extended temperature range provide design advantages and where the narrower supply voltage range is acceptable.

BA14741F-E2 (Rohm Semiconductor) is an Active status general purpose quad amplifier in 14-SOP packaging with supply voltage range of 4 V to 36 V, matching the OPA4137U envelope. Slew rate is 1 V/µs and gain bandwidth product is 2 MHz. This part offers the widest supply voltage compatibility and highest inventory availability (50300 units in stock). Moisture sensitivity level is 1 (Unlimited), superior to the OPA4137U specification of 3 (168 Hours).

ISL55004IBZ-T13 (Renesas Electronics Corporation) is an Active status voltage feedback quad amplifier in 14-SOIC packaging. This part provides significantly higher performance specifications: slew rate of 300 V/µs, gain bandwidth product of 70 MHz, and -3dB bandwidth of 200 MHz. Supply voltage range is 4.5 V to 30 V. This part is suitable for high-speed signal conditioning applications where the OPA4137U bandwidth is insufficient.

LM224ADT, LM224D, and LM224DT (STMicroelectronics) are Active status general purpose quad amplifiers in 14-SOIC packaging with supply voltage range of 3 V to 30 V. These parts offer extended lower temperature range (-55°C for LM124DT) and are available in high inventory quantities (34870 units for LM224ADT, 35200 units for LM224DT). Input bias current is 20 nA and slew rate is 0.4 V/µs. These parts are suitable for cost-optimized designs where the lower supply voltage minimum (3 V) and higher inventory availability are advantageous.

LM248DT (STMicroelectronics) is an Active status general purpose quad amplifier in 14-SOIC packaging with supply voltage specification of 44 V (fixed, not a range). This part is suitable only for applications requiring exactly 44 V supply operation.

All recommended substitute parts are ROHS3 Compliant and REACH Unaffected, meeting current environmental and regulatory requirements.

Frequently Asked Questions (FAQ)

Q1: Can OPA4137U/2K5 be used as a direct replacement for OPA4137U?

A: Yes. OPA4137U/2K5 is the tape and reel packaging variant of the same base product OPA4137. Electrical specifications, pin configuration, and mechanical dimensions are identical. The only difference is packaging format: OPA4137U is supplied in Tube packaging, while OPA4137U/2K5 is supplied in Tape & Reel format. Both are compatible with the same PCB footprint and assembly processes.

Q2: What are the key differences between J-FET amplifiers (OPA4137U) and General Purpose amplifiers (LM224 series)?

A: J-FET input amplifiers like the OPA4137U feature extremely low input bias current (5 pA) and are optimized for high-impedance signal sources. General Purpose amplifiers like the LM224 series have higher input bias current (20 nA) but offer lower cost and simpler biasing requirements. Selection depends on application requirements for input impedance and bias current performance.

Q3: Why does the ADA4004 series have a narrower supply voltage range (10 V to 30 V) compared to OPA4137U (4.5 V to 36 V)?

A: The ADA4004 series is designed for general purpose applications with optimized performance within the 10 V to 30 V range. The OPA4137U is designed for wider supply voltage compatibility, making it suitable for battery-powered and industrial applications requiring operation from 4.5 V to 36 V. Application supply voltage requirements determine which part is appropriate.

Q4: Is the ISL55004IBZ-T13 a suitable substitute for all OPA4137U applications?

A: ISL55004IBZ-T13 is a suitable substitute only for applications where the higher bandwidth (70 MHz versus 1 MHz) and faster slew rate (300 V/µs versus 3.5 V/µs) do not introduce stability or noise issues. The narrower supply voltage range (4.5 V to 30 V versus 4.5 V to 36 V) must also be verified. Applications requiring the specific low-bandwidth characteristics of the OPA4137U should not use ISL55004IBZ-T13 without circuit redesign.

Q5: What is the significance of Moisture Sensitivity Level (MSL) in packaging?

A: MSL indicates the maximum time a component can be stored in ambient conditions (typically 30°C, 85% relative humidity) before moisture absorption requires baking before soldering. OPA4137U and most substitutes have MSL 3 (168 hours), meaning they must be baked if exposed to ambient conditions for more than 168 hours. BA14741F-E2 has MSL 1 (Unlimited), requiring no moisture management. Higher MSL ratings reduce manufacturing handling complexity.

Q6: Can LM248DT be used in applications designed for OPA4137U?

A: LM248DT is not recommended as a general substitute. Its supply voltage specification is fixed at 44 V (not a range), making it unsuitable for applications requiring variable supply voltage operation. Use LM248DT only in applications specifically designed for 44 V single supply operation.

Q7: What packaging considerations apply when substituting OPA4137U with BA14741F-E2?

A: BA14741F-E2 is supplied in 14-SOP packaging (0.173", 4.40mm width) versus OPA4137U in 14-SOIC packaging (0.154", 3.90mm width). While both are 14-pin surface mount packages, the physical dimensions differ. PCB footprint and assembly equipment compatibility must be verified before substitution. Consult package datasheets for exact pin spacing and land pattern requirements.

Q8: Why is OPA4137U classified as Last Time Buy?

A: Last Time Buy status indicates Texas Instruments has discontinued production of this part. Existing inventory will be sold until depletion, after which the part will no longer be available. This classification necessitates identification of substitute parts for design continuity and long-term supply chain planning.

Q9: Are all substitute parts ROHS3 Compliant?

A: Yes. All substitute parts listed in this document are ROHS3 Compliant and REACH Unaffected, meeting current environmental regulations for lead-free and restricted substance requirements.

Q10: Which substitute offers the best inventory availability?

A: BA14741F-E2 offers the highest inventory availability with 50300 units in stock. For Texas Instruments products specifically, OPA4137U/2K5 offers 9410 units in stock, significantly higher than the original OPA4137U at 2295 units.

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