LM837M Equivalent & Substitute Parts

Part Overview

The LM837M is a general-purpose operational amplifier integrated circuit manufactured by Texas Instruments, configured as a quad amplifier (4 circuits) in a 14-SOIC surface mount package. This device is classified as obsolete, which necessitates identification of active alternative components for new designs and ongoing production requirements. The LM837M operates across a supply voltage span of 36V with a slew rate of 10V/µs and gain bandwidth product of 25 MHz, making it suitable for general-purpose amplification applications requiring moderate bandwidth and speed characteristics.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	4	—
Slew Rate	10	V/µs
Gain Bandwidth Product	25	MHz
Current - Input Bias	500	nA
Voltage - Input Offset	300	µV
Current - Supply	10	mA (x4 Channels)
Current - Output / Channel	40	mA
Voltage - Supply Span	36	V
Operating Temperature	-40 to 85	°C
Package / Case	14-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the LM837M is determined by strict alignment of the following electrical and mechanical parameters:

Primary Substitution Criteria:

Number of circuits: 4 (quad configuration required)
Package type: 14-SOIC surface mount form factor
Amplifier type classification: General Purpose or J-FET topology
Supply voltage compatibility: Minimum 36V span or greater
Operating temperature range: Must encompass -40°C to 85°C or broader
Output current per channel: Minimum 40 mA
Slew rate: 10 V/µs or greater
Gain bandwidth product: 25 MHz or greater

Secondary Compatibility Parameters:

Input bias current: 500 nA or lower preferred for signal integrity
Input offset voltage: 300 µV or lower preferred
Supply current: 10 mA or lower preferred for power efficiency
RoHS and REACH compliance status for regulatory alignment

Substitute parts are grouped into two categories: General Purpose Amplifiers (matching the LM837M topology) and J-FET Amplifiers (alternative topology with superior input characteristics). Both categories maintain the 14-SOIC package and quad configuration while offering active product status and modern compliance certifications.

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Slew Rate (V/µs)	GBW (MHz)	Input Bias (nA)	Input Offset (µV)	Supply Span (V)	Temp Range (°C)	Product Status	RoHS Status
LM837M	Texas Instruments	General Purpose	10	25	500	300	36	-40 to 85	Obsolete	Non-compliant
OPA4228UA	Burr Brown	General Purpose	11	33	2.5	10	5 to 36	-55 to 85	Active	—
LF247DT	STMicroelectronics	J-FET	16	4	0.02	3000	44	-40 to 105	Active	ROHS3 Compliant
LF347D	STMicroelectronics	J-FET	16	3	0.02	3000	44	0 to 70	Active	ROHS3 Compliant
LF347DT	STMicroelectronics	J-FET	16	4	0.02	3000	44	0 to 70	Active	ROHS3 Compliant
LM324EDR2G	onsemi	General Purpose	—	—	90	2000	3 to 32	0 to 70	Active	ROHS3 Compliant
LT1463CS#PBF	Analog Devices Inc.	J-FET	0.13	0.175	0.001	600	10 to 30	0 to 70	Last Time Buy	ROHS3 Compliant
LT1465CS#PBF	Analog Devices Inc.	J-FET	0.9	1	0.0005	600	10 to 30	-40 to 85	Active	ROHS3 Compliant
LT1465CS#TRPBF	Analog Devices Inc.	J-FET	0.9	1	0.0005	600	10 to 30	-40 to 85	Active	ROHS3 Compliant
MC33079DR2G	onsemi	General Purpose	7	16	300	150	10 to 36	-40 to 85	Active	ROHS3 Compliant
TL064CDT	STMicroelectronics	J-FET	3.5	1	0.03	3000	6 to 36	0 to 70	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct General-Purpose Replacement (Matching Topology):

The OPA4228UA (Burr Brown) provides the closest functional match to the LM837M. It maintains general-purpose amplifier topology with superior electrical characteristics: slew rate of 11 V/µs exceeds the LM837M specification, gain bandwidth product of 33 MHz provides additional margin, and input bias current of 2.5 nA represents a 200-fold improvement. The supply voltage range of 5V to 36V encompasses the LM837M operating window. This device is in active production status with full regulatory compliance potential.

The MC33079DR2G (onsemi) offers an alternative general-purpose solution with active product status and ROHS3 compliance. Operating parameters include slew rate of 7 V/µs and gain bandwidth product of 16 MHz, which fall below the LM837M baseline but remain functional for applications not requiring maximum performance. Supply voltage range of 10V to 36V and operating temperature of -40°C to 85°C match the LM837M specification exactly.

For Extended Temperature and Supply Voltage Range:

The LF247DT and LF347DT (STMicroelectronics) provide J-FET topology with superior input characteristics (20 pA input bias current) and extended supply voltage span of 44V. These devices are ROHS3 compliant and in active production. Operating temperature range extends to 105°C for LF247DT. Slew rate of 16 V/µs exceeds LM837M specification. Gain bandwidth product of 3-4 MHz is lower than LM837M; applications requiring 25 MHz bandwidth must evaluate circuit-level compensation.

For Ultra-Low Input Bias Current Applications:

The LT1465CS#PBF and LT1465CS#TRPBF (Analog Devices Inc.) deliver J-FET technology with input bias current of 0.5 pA, representing a 1,000,000-fold improvement over the LM837M. Operating temperature range of -40°C to 85°C matches the LM837M. These devices are ROHS3 compliant and in active production. Supply voltage range of 10V to 30V requires circuit evaluation for compatibility with 36V supply applications.

Compliance and Regulatory Status:

All recommended substitute parts carry ROHS3 compliance certification, addressing modern regulatory requirements. The LM837M is RoHS non-compliant. All substitute parts maintain REACH Unaffected status and EAR99 export classification, matching the LM837M regulatory profile.

Frequently Asked Questions (FAQ)

Q: Can the OPA4228UA directly replace the LM837M in existing PCB layouts?

A: Yes. Both devices use the 14-SOIC package with identical 0.154" (3.90mm) width and pin configuration. PCB footprints are compatible. Electrical performance of the OPA4228UA exceeds LM837M specifications across slew rate, gain bandwidth product, and input bias current, making it a direct functional upgrade.

Q: What is the primary difference between general-purpose and J-FET amplifier substitutes?

A: General-purpose amplifiers (OPA4228UA, MC33079DR2G, LM324EDR2G) use bipolar input stages, delivering moderate input bias currents (90-500 nA) and higher slew rates (7-11 V/µs). J-FET amplifiers (LF247DT, LF347DT, TL064CDT, LT1465 series) use field-effect transistor input stages, delivering extremely low input bias currents (0.02-30 pA) and lower slew rates (0.13-16 V/µs). Selection depends on application requirements for input impedance versus bandwidth.

Q: Does the LM324EDR2G meet the LM837M supply voltage specification?

A: No. The LM324EDR2G operates across 3V to 32V supply span, which does not encompass the full 36V specification of the LM837M. This device is suitable only for applications operating within the 3V to 32V window. For full 36V compatibility, select OPA4228UA, MC33079DR2G, or LF-series devices.

Q: Are all substitute parts available in the same packaging options?

A: All substitute parts are available in 14-SOIC surface mount package. Packaging variants differ: OPA4228UA is standard tube; LF247DT is Tape & Reel; LF347D is Tube; LF347DT is Cut Tape & Digi-Reel; LM324EDR2G is Tape & Reel; LT1463CS#PBF and LT1465CS#PBF are Tube; LT1465CS#TRPBF is Tape & Reel; MC33079DR2G is Cut Tape & Digi-Reel; TL064CDT is Cut Tape & Digi-Reel. Consult procurement requirements for specific packaging needs.

Q: Which substitute offers the best performance for high-speed signal conditioning?

A: The OPA4228UA delivers the highest gain bandwidth product (33 MHz) among active substitutes, exceeding the LM837M baseline of 25 MHz. Slew rate of 11 V/µs also exceeds the LM837M specification of 10 V/µs. For applications requiring maximum bandwidth and slew rate performance, the OPA4228UA is the optimal selection.

Q: Can J-FET amplifiers replace the LM837M in DC precision applications?

A: J-FET amplifiers offer superior input bias current characteristics (0.02-30 pA versus 500 nA for LM837M), making them suitable for high-impedance signal sources. However, input offset voltage specifications vary: LF-series devices specify 3 mV (10,000 µV), significantly higher than the LM837M specification of 300 µV. For DC precision applications requiring low offset voltage, general-purpose substitutes (OPA4228UA, MC33079DR2G) are more appropriate.

Q: What is the inventory status of substitute parts?

A: OPA4228UA: 3,059 units; LF247DT: 17,352 units; LF347D: 16,726 units; LF347DT: 27,321 units; LM324EDR2G: 25,969 units; LT1463CS#PBF: 1,415 units; LT1465CS#PBF: 5,145 units; LT1465CS#TRPBF: 2,100 units; MC33079DR2G: 27,825 units; TL064CDT: 18,160 units. All parts are listed as new original stock.

Q: Is the LM837M still available for purchase?

A: The LM837M is classified as obsolete. Current inventory is 6,045 units listed as new original stock. For new designs and long-term production, transition to active substitute parts is required. The OPA4228UA or MC33079DR2G are recommended for immediate design migration.

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