LM2902MX Equivalent & Substitute Parts

Part Overview

The LM2902MX is a general-purpose operational amplifier featuring four independent circuits in a 14-SOIC surface mount package, manufactured by Texas Instruments under the LinCMOS™ series. This device is classified as obsolete, though 2,887 units remain in stock as new original inventory. The LM2902MX operates across a wide supply voltage range of 3V to 32V and is suitable for applications requiring low input bias current and moderate bandwidth performance. Due to its obsolete status, equivalent and substitute parts are necessary for new designs and long-term supply chain continuity.

Key Parameters

Parameter	Value
Amplifier Type	General Purpose
Number of Circuits	4
Gain Bandwidth Product	1 MHz
Current - Input Bias	45 nA
Voltage - Input Offset	2 mV
Current - Supply	1.5 mA
Current - Output / Channel	30 mA
Voltage - Supply Span (Min)	3 V
Voltage - Supply Span (Max)	32 V
Operating Temperature	-40°C ~ 85°C
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the LM2902MX is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Four independent operational amplifier circuits
General-purpose amplifier classification
14-pin SOIC package form factor (0.154" width, 3.90mm)
Supply voltage range compatibility: minimum 3V, maximum 32V
Operating temperature range: -40°C minimum
Surface mount technology
ROHS3 compliance and MSL Level 1 rating

Secondary Compatibility Parameters:

Gain bandwidth product: 1 MHz nominal (tolerance range 800 kHz to 1.3 MHz acceptable)
Input bias current: 45 nA nominal (range 20 nA to 90 nA acceptable)
Input offset voltage: 2 mV maximum
Output current per channel: 30 mA minimum
Supply current: 1.5 mA nominal

Substitute parts are grouped into two categories: direct equivalents (identical electrical specifications and package) and functional equivalents (compatible electrical performance within specified ranges, same package family).

Parameter Comparison

Part Number	Manufacturer	Product Status	GBW (MHz)	Input Bias (nA)	Input Offset (mV)	Output Current (mA)	Supply Current (mA)	Temp Range (°C)	Package	Inventory
LM2902MX	Texas Instruments	Obsolete	1	45	2	30	1.5	-40 to 85	14-SOIC	2,887
LM2902MX/NOPB	Texas Instruments	Active	1	45	2	40	1.5	-40 to 85	14-SOIC	1,499
LM2902DR2G	onsemi	Active	1	90	2	40	—	-40 to 105	14-SOIC	205,100
LM2902VDR2G	onsemi	Active	1	90	2	40	—	-40 to 125	14-SOIC	45,400
LM2902DT	Rohm Semiconductor	Not For New Designs	0.8	20	1	30	1	-40 to 125	14-SOIC	105,100
LM2902YDT	STMicroelectronics	Active	1.3	20	2	60	1.5	-40 to 125	14-SOIC	8,264
LM224ADT	STMicroelectronics	Active	1.3	20	2	40	1.5	-40 to 105	14-SOIC	34,870
LM324DT	Rohm Semiconductor	Not For New Designs	1.3	20	1	40	1	-40 to 85	14-SOIC	405,100
BA2902F-E2	Rohm Semiconductor	Active	0.5	20	2	30	0.7	-40 to 125	14-SOP	5,300
BA2902SF-E2	Rohm Semiconductor	Active	0.5	20	2	30	0.7	-40 to 105	14-SOP	3,105
MC3403DT	STMicroelectronics	Active	1	40	1	30	2.8	0 to 70	14-SOIC	3,944

Engineering Selection Recommendations

For Active Production and New Designs:

The LM2902MX/NOPB (Texas Instruments, Active status) is the direct equivalent replacement, maintaining identical electrical specifications while offering improved output current capability (40 mA vs. 30 mA per channel). This part is recommended as the primary substitute for new designs requiring continuity with the original LM2902MX specification.

The LM2902DR2G and LM2902VDR2G (onsemi, Active status) provide functionally equivalent performance with extended operating temperature ranges (-40°C to 105°C and -40°C to 125°C respectively). These parts feature identical gain bandwidth product and supply voltage compatibility, with significantly higher inventory availability (205,100 and 45,400 units respectively). The LM2902VDR2G offers the widest temperature range and is suitable for automotive and industrial applications.

The LM224ADT (STMicroelectronics, Active status) offers enhanced performance characteristics including 1.3 MHz gain bandwidth product and 40 mA output current per channel, with 34,870 units in stock. This part is suitable for applications requiring improved bandwidth performance within the same package footprint.

The LM2902YDT (STMicroelectronics, Active status, AEC-Q100 qualified) provides automotive-grade performance with push-pull output configuration and 60 mA output current per channel. This part is appropriate for automotive applications requiring enhanced output drive capability.

For Legacy System Support:

The LM2902DT and LM324DT (Rohm Semiconductor, Not For New Designs status) remain available with substantial inventory (105,100 and 405,100 units respectively) for legacy system maintenance and repair applications. These parts are not recommended for new designs due to their discontinued status.

For Low-Power Applications:

The BA2902F-E2 and BA2902SF-E2 (Rohm Semiconductor, Active status) offer reduced supply current consumption (0.7 mA vs. 1.5 mA) and are suitable for battery-powered or low-power applications. Note that these parts feature 14-SOP package (0.173", 4.40mm width) rather than the standard 14-SOIC, requiring PCB layout verification for mechanical compatibility.

Compliance Verification:

All listed substitute parts maintain ROHS3 compliance and MSL Level 1 rating, ensuring compatibility with modern manufacturing processes and supply chain requirements. All parts are classified as EAR99 for export control purposes.

Frequently Asked Questions (FAQ)

Q: Can the LM2902MX be directly replaced with LM2902MX/NOPB?

A: Yes. The LM2902MX/NOPB is the direct equivalent with identical electrical specifications. The "/NOPB" designation indicates lead-free, RoHS-compliant packaging. The primary difference is improved output current capability (40 mA vs. 30 mA per channel), which provides enhanced performance margin. This part is Active status and recommended for all new designs.

Q: What is the difference between LM2902DR2G and LM2902VDR2G?

A: Both parts are manufactured by onsemi and feature identical electrical specifications (1 MHz GBW, 90 nA input bias current). The primary difference is operating temperature range: LM2902DR2G operates -40°C to 105°C, while LM2902VDR2G operates -40°C to 125°C. The LM2902VDR2G is suitable for extended temperature applications including automotive and industrial environments. Both parts offer significantly higher inventory availability than the original LM2902MX.

Q: Why do BA2902F-E2 and BA2902SF-E2 have different package dimensions?

A: Both Rohm Semiconductor parts use 14-SOP package designation but with different physical dimensions: 0.173" (4.40mm) width compared to the standard 14-SOIC 0.154" (3.90mm) width. This represents a minor dimensional variation within the SOP family. PCB layout verification is required to confirm mechanical compatibility with existing LM2902MX footprints before substitution.

Q: Can LM224ADT replace LM2902MX in all applications?

A: LM224ADT is functionally compatible for most general-purpose amplifier applications. Key differences include enhanced gain bandwidth product (1.3 MHz vs. 1 MHz) and improved output current (40 mA vs. 30 mA per channel). The operating temperature range is -40°C to 105°C, which is wider than the original -40°C to 85°C. These improvements make LM224ADT suitable as a drop-in replacement with performance enhancement. Verify that the enhanced bandwidth does not introduce stability issues in existing circuit designs.

Q: Is LM2902YDT suitable for automotive applications?

A: Yes. The LM2902YDT is AEC-Q100 qualified and carries automotive-grade designation. It features push-pull output configuration with 60 mA output current per channel, extended operating temperature range (-40°C to 125°C), and 1.3 MHz gain bandwidth product. This part is specifically designed for automotive applications and is recommended for automotive system designs.

Q: What is the significance of "Not For New Designs" status for LM2902DT and LM324DT?

A: "Not For New Designs" indicates that these parts are in mature or discontinued lifecycle phases and are not recommended for incorporation into new product designs. However, these parts remain available in substantial quantities (105,100 and 405,100 units respectively) for legacy system support, repair, and maintenance applications. New designs should utilize Active status alternatives such as LM2902MX/NOPB, LM2902DR2G, or LM224ADT.

Q: How does MC3403DT differ from LM2902MX in terms of operating temperature?

A: MC3403DT operates over a narrower temperature range (0°C to 70°C) compared to LM2902MX (-40°C to 85°C). This makes MC3403DT unsuitable for applications requiring extended low-temperature operation below 0°C or high-temperature operation above 70°C. MC3403DT is appropriate only for commercial-grade applications within the 0°C to 70°C range.

Q: What packaging considerations apply when substituting BA2902 series parts?

A: BA2902F-E2 and BA2902SF-E2 use 14-SOP package with 0.173" (4.40mm) width, compared to the standard 14-SOIC 0.154" (3.90mm) width of LM2902MX. This dimensional difference may affect PCB footprint compatibility. Verify that existing PCB layouts accommodate the wider package body before implementing substitution. Pin pitch and lead configuration remain compatible with standard 14-pin SOIC footprints.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating. This ensures compatibility with modern manufacturing processes, lead-free soldering requirements, and supply chain standards. All parts are classified as EAR99 for export control purposes.

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