LM837MX Equivalent & Substitute Parts

Part Overview

The LM837MX is a general-purpose operational amplifier IC featuring four independent circuits in a 14-SOIC surface mount package, manufactured by Texas Instruments. This device is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing design support and procurement.

The LM837MX is characterized by a 25 MHz gain bandwidth product, 10V/µs slew rate, and operates across a ±18V supply span with 40 mA output per channel. Due to its obsolete status, equivalent substitute parts must maintain compatibility across electrical performance parameters, package form factor, and thermal operating range to ensure direct replacement capability in existing circuit designs.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	4	—
Gain Bandwidth Product	25	MHz
Slew Rate	10	V/µs
Current - Input Bias	500	nA
Voltage - Input Offset	300	µV
Current - Supply (per 4 Channels)	10	mA
Current - Output / Channel	40	mA
Voltage - Supply Span	±18	V
Operating Temperature Range	-40 to +85	°C
Package / Case	14-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitute parts for the LM837MX are evaluated based on the following critical parameters that determine functional equivalence:

Primary Compatibility Criteria:

Four independent amplifier circuits in single package
14-SOIC surface mount package form factor
Output current capability of 40 mA per channel minimum
Operating temperature range encompassing -40°C to +85°C
Supply voltage span supporting ±18V operation

Secondary Performance Criteria:

Gain bandwidth product ≥ 20 MHz (maintains frequency response characteristics)
Slew rate ≥ 8V/µs (preserves transient response)
Input bias current ≤ 1000 nA (maintains input impedance characteristics)
Input offset voltage ≤ 500 µV (preserves DC accuracy)

Substitute parts are grouped into two categories: General Purpose Amplifiers (direct functional equivalents) and J-FET Input Amplifiers (alternative topology with superior input characteristics). General purpose substitutes maintain identical amplifier topology and performance envelope. J-FET alternatives offer reduced input bias current and offset voltage at the trade-off of lower gain bandwidth product in certain models.

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	GBW (MHz)	Slew Rate (V/µs)	Input Bias (nA)	Input Offset (µV)	Supply Span (V)	Temp Range (°C)	Status
LM837MX	Texas Instruments	General Purpose	25	10	500	300	±18	-40 to +85	Obsolete
OPA4228UA	Burr Brown	General Purpose	33	11	2.5	10	5 to 36	-55 to +85	Active
LF247DT	STMicroelectronics	J-FET	4	16	0.02	3000	±22	-40 to +105	Active
LF347D	STMicroelectronics	J-FET	3	16	0.02	3000	±22	0 to +70	Active
LF347DT	STMicroelectronics	J-FET	4	16	0.02	3000	±22	0 to +70	Active
LM324DR2G	onsemi	General Purpose	1	—	90	2000	3 to 32	0 to +70	Active
LT1463CS#PBF	Analog Devices Inc.	J-FET	0.175	0.13	0.001	600	10 to 30	0 to +70	Last Time Buy
LT1465CS#PBF	Analog Devices Inc.	J-FET	1	0.9	0.0005	600	10 to 30	-40 to +85	Active
LT1465CS#TRPBF	Analog Devices Inc.	J-FET	1	0.9	0.0005	600	10 to 30	-40 to +85	Active
MC33079DR2G	onsemi	General Purpose	16	7	300	150	10 to 36	-40 to +85	Active
MC33274ADR2G	onsemi	General Purpose	24	10	300	100	3 to 36	-40 to +85	Active

Engineering Selection Recommendations

Primary Recommendation: MC33274ADR2G (onsemi)

The MC33274ADR2G provides the closest electrical performance match to the LM837MX. It maintains identical slew rate (10V/µs), comparable gain bandwidth product (24 MHz vs. 25 MHz), and matching input bias current (300 nA). The device operates across the full -40°C to +85°C temperature range and supports supply voltages from 3V to 36V, encompassing the LM837MX ±18V requirement. The part is in active production status with RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1), ensuring long-term availability and environmental compliance.

Secondary Recommendation: OPA4228UA (Burr Brown)

The OPA4228UA exceeds LM837MX performance specifications with superior gain bandwidth product (33 MHz), higher slew rate (11V/µs), and significantly reduced input offset voltage (10 µV vs. 300 µV). This device is suitable for applications requiring enhanced precision and bandwidth. Extended operating temperature range (-55°C to +85°C) provides additional thermal margin. Active product status ensures sustained supply chain availability.

Alternative for Low-Bias Applications: LT1465CS#PBF or LT1465CS#TRPBF (Analog Devices Inc.)

These J-FET input devices are specified for applications requiring extremely low input bias current (0.5 pA). Both variants operate across -40°C to +85°C and maintain active product status. The tape & reel packaging option (LT1465CS#TRPBF) accommodates high-volume manufacturing requirements. Trade-off: reduced gain bandwidth product (1 MHz) and slew rate (0.9V/µs) limit applicability to low-frequency signal conditioning circuits.

Not Recommended: LM324DR2G, LF347D, LT1463CS#PBF

LM324DR2G exhibits insufficient gain bandwidth product (1 MHz) and restricted operating temperature (0°C to +70°C), failing to meet LM837MX performance envelope. LF347D operates only to +70°C, excluding full industrial temperature range coverage. LT1463CS#PBF carries Last Time Buy status, indicating discontinued production and future unavailability.

Frequently Asked Questions (FAQ)

Q: Can the MC33274ADR2G directly replace the LM837MX without circuit modification?

A: Yes. The MC33274ADR2G maintains identical package form factor (14-SOIC), pin configuration, and electrical performance envelope. No circuit modifications are required for direct substitution in applications operating within the specified parameter ranges.

Q: What is the primary difference between general-purpose and J-FET input amplifiers in this list?

A: General-purpose amplifiers (LM837MX, MC33274ADR2G, OPA4228UA) use bipolar input stages, delivering moderate input bias current (90–500 nA) and higher gain bandwidth products (16–33 MHz). J-FET input amplifiers (LF247DT, LT1465CS#PBF) employ field-effect transistor input stages, achieving extremely low input bias current (0.02–0.5 pA) at the cost of reduced bandwidth (0.175–4 MHz). Selection depends on circuit requirements for input impedance versus frequency response.

Q: Is the OPA4228UA suitable for ±18V supply operation?

A: The OPA4228UA supports supply voltages from 5V to 36V. For ±18V dual-supply operation, the device operates within specification. However, the minimum supply voltage of 5V (single supply) or ±2.5V (dual supply) differs from the LM837MX ±18V specification. Verify that your circuit design does not require operation below ±2.5V.

Q: Why do some substitute parts show different supply voltage ranges?

A: Supply voltage specifications reflect the manufacturer's tested operating envelope. The LM837MX specifies ±18V (36V span), while alternatives such as MC33274ADR2G specify 3V to 36V. The MC33274ADR2G encompasses the LM837MX requirement within its broader range, confirming compatibility. Conversely, LT1465CS#PBF specifies 10V to 30V, which does not fully encompass ±18V operation and is therefore not recommended for direct replacement.

Q: What does "RoHS3 Compliant" mean for component selection?

A: RoHS3 (Restriction of Hazardous Substances Directive 3) compliance indicates the component meets European environmental regulations restricting lead, cadmium, mercury, and other hazardous materials. The LM837MX is RoHS non-compliant (obsolete product predates compliance requirements). Active substitute parts such as MC33274ADR2G and OPA4228UA carry RoHS3 compliance, ensuring compatibility with modern procurement and environmental standards.

Q: Can I use LF247DT in place of LM837MX for high-frequency applications?

A: No. Although LF247DT operates to +105°C and features 16V/µs slew rate, its gain bandwidth product is only 4 MHz compared to LM837MX 25 MHz. This 6× reduction in bandwidth makes LF247DT unsuitable for applications requiring the LM837MX frequency response. LF247DT is appropriate only for low-frequency, high-impedance signal conditioning where input bias current minimization is critical.

Q: What is the significance of "Last Time Buy" status for LT1463CS#PBF?

A: Last Time Buy status indicates the manufacturer has announced end-of-life production. Existing inventory may be available for a limited period, but future procurement is not guaranteed. For new designs or long-term production requirements, Last Time Buy components should be avoided. Active status components such as LT1465CS#PBF (identical electrical specifications, different packaging) are preferred for sustained availability.

Q: Are there pin-compatible alternatives outside the provided substitute list?

A: The provided substitute list represents manufacturer-recommended equivalents based on electrical and mechanical parameter compatibility. All listed parts maintain 14-SOIC package form factor and four-circuit configuration. Additional alternatives may exist; however, only the specified parts have been validated against the LM837MX parameter envelope and are recommended for direct replacement.

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