LM2902DG Equivalent & Substitute Parts

Part Overview

The LM2902DG is a general-purpose operational amplifier integrated circuit manufactured by onsemi, configured as a 4-circuit device in a 14-SOIC surface mount package. This component is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design requirements and production continuity. The LM2902DG operates across a wide supply voltage range of 3V to 32V with an operating temperature range of -40°C to 105°C, making it suitable for diverse industrial and commercial applications requiring low-power amplification.

Key Parameters

Parameter	Value
Amplifier Type	General Purpose
Number of Circuits	4
Gain Bandwidth Product	1 MHz
Current - Input Bias	90 nA
Voltage - Input Offset	2 mV
Current - Output / Channel	40 mA
Voltage - Supply Span (Min)	3 V
Voltage - Supply Span (Max)	32 V
Operating Temperature	-40°C ~ 105°C
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the LM2902DG is determined by strict alignment of the following critical parameters:

Primary Substitution Criteria:

Amplifier Type: General Purpose
Number of Circuits: 4
Package / Case: 14-SOIC with 0.154" (3.90mm) width
Mounting Type: Surface Mount
Voltage - Supply Span: Minimum 3V, Maximum 32V or greater
Current - Output / Channel: 40 mA or greater
Voltage - Input Offset: 2 mV or lower
Operating Temperature Range: Must encompass -40°C to 105°C or provide coverage within application requirements

Substitute parts are categorized into two groups:

Direct Substitutes (Same Amplifier Type): Parts maintaining general-purpose amplifier classification with identical circuit count and package specifications.

Similar Substitutes (Alternative Amplifier Type): Parts with J-FET amplifier topology offering enhanced performance characteristics while maintaining 4-circuit configuration and 14-SOIC packaging. These parts provide superior input bias current performance but operate under different electrical parameters.

Parameter Comparison

Parameter	LM2902DG (Main)	LM2902MX/NOPB	ADTL084ARZ	AS324AMTR-E1	BA2902F-E2
Manufacturer	onsemi	Texas Instruments	Analog Devices Inc.	Diodes Incorporated	Rohm Semiconductor
Amplifier Type	General Purpose	General Purpose	J-FET	General Purpose	General Purpose
Number of Circuits	4	4	4	4	4
Gain Bandwidth Product	1 MHz	1 MHz	5 MHz	Not Specified	500 kHz
Current - Input Bias	90 nA	45 nA	2 pA	20 nA	20 nA
Voltage - Input Offset	2 mV	2 mV	1.5 mV	2 mV	2 mV
Current - Output / Channel	40 mA	40 mA	27 mA	40 mA	30 mA
Voltage - Supply Span (Min)	3 V	3 V	8 V	3 V	3 V
Voltage - Supply Span (Max)	32 V	32 V	36 V	36 V	32 V
Operating Temperature	-40°C ~ 105°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 125°C
Package / Case	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)	14-SOIC (0.173", 4.40mm)
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	Not Specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

LM2902MX/NOPB (Texas Instruments) is the primary direct substitute for the LM2902DG. This part maintains identical amplifier type classification, circuit count, and package dimensions. The LM2902MX/NOPB is active in production status with ROHS3 compliance and LinCMOS™ series designation. Input bias current is reduced to 45 nA compared to the original 90 nA specification. Operating temperature range is limited to -40°C to 85°C, which may require evaluation for applications requiring the full 105°C upper limit of the original part.

AS324AMTR-E1 and AS324MTR-G1 (Diodes Incorporated) provide direct substitution with general-purpose amplifier topology and identical electrical parameters for supply voltage, input offset voltage, and output current per channel. These parts are active in production with ROHS3 compliance. Operating temperature range is -40°C to 85°C. AS324MTR-G1 offers the highest inventory availability at 196,751 pieces.

ADTL084ARZ and variants (Analog Devices Inc.) represent alternative substitution with J-FET amplifier topology. These parts provide superior input bias current performance (2 pA) and extended operating temperature range to 125°C. However, minimum supply voltage requirement is 8V, which restricts application in circuits requiring 3V to 8V operation. Gain bandwidth product is elevated to 5 MHz. Output current per channel is reduced to 27 mA. ADTL084ARZ-REEL7 offers the highest inventory availability at 44,200 pieces.

BA2902F-E2 (Rohm Semiconductor) provides general-purpose amplification with extended operating temperature range to 125°C. Package width is 0.173" (4.40mm) compared to the standard 0.154" (3.90mm), which may require PCB layout verification. Gain bandwidth product is reduced to 500 kHz. This part is suitable for applications where thermal performance and lower bandwidth requirements align with design specifications.

Frequently Asked Questions (FAQ)

Q: Can the LM2902MX/NOPB directly replace the LM2902DG in all applications?

A: The LM2902MX/NOPB is electrically compatible for most applications. The primary consideration is the reduced operating temperature upper limit of 85°C versus the original 105°C specification. Applications operating above 85°C require evaluation of thermal conditions and potential use of alternative parts such as BA2902F-E2 or ADTL084ARZ variants, which support 125°C operation.

Q: What is the difference between general-purpose and J-FET amplifier types in the ADTL084ARZ?

A: The ADTL084ARZ uses J-FET input stage technology, resulting in dramatically lower input bias current (2 pA versus 90 nA in the original). This characteristic is advantageous for high-impedance signal sources. However, the ADTL084ARZ requires minimum 8V supply voltage, restricting use in low-voltage applications below 8V. The original LM2902DG and direct substitutes operate from 3V minimum.

Q: Are there package compatibility concerns with the BA2902F-E2?

A: The BA2902F-E2 uses a 14-SOP package with 0.173" (4.40mm) width, compared to the standard 0.154" (3.90mm) width of the LM2902DG. This dimensional difference requires verification of PCB footprint compatibility and may necessitate layout modifications. The AS324 and LM2902MX/NOPB variants maintain the standard 0.154" width and are preferred for direct PCB substitution without layout changes.

Q: Which substitute part offers the best inventory availability?

A: AS324MTR-G1 from Diodes Incorporated provides the highest inventory availability at 196,751 pieces in stock. This part maintains full electrical compatibility with the LM2902DG for general-purpose amplification applications within the -40°C to 85°C operating range.

Q: Can the ADTL084ARZ be used in circuits designed for the LM2902DG?

A: The ADTL084ARZ is electrically compatible only for circuits with supply voltages of 8V or greater. Applications using supply voltages between 3V and 8V cannot use the ADTL084ARZ due to its 8V minimum supply requirement. Additionally, the reduced output current per channel (27 mA versus 40 mA) must be verified against load requirements. The superior input bias current performance (2 pA) makes the ADTL084ARZ suitable for high-impedance signal conditioning applications where this characteristic provides design advantage.

Q: What compliance certifications should be verified for new designs?

A: All active substitute parts listed are ROHS3 compliant and REACH unaffected. The LM2902DG original part does not specify RoHS status. For new designs requiring regulatory compliance, selection of ROHS3-compliant substitutes such as LM2902MX/NOPB, AS324 variants, ADTL084ARZ variants, or BA2902F-E2 is required.

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