LM2904ADMR2 Equivalent & Substitute Parts

Part Overview

The LM2904ADMR2 is a general-purpose dual operational amplifier manufactured by onsemi, housed in an 8-MSOP surface-mount package. This device is classified as obsolete and is no longer recommended for new designs. The LM2904ADMR2 operates across a wide supply voltage range (3V to 26V) and is suitable for applications requiring low-cost, general-purpose amplification in single-supply configurations.

Due to its obsolete status, identifying equivalent and substitute parts is essential for design continuity, production support, and long-term component availability. Active alternatives with identical or enhanced electrical characteristics are available from multiple manufacturers.

Key Parameters

Parameter	LM2904ADMR2 Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	2	—
Gain Bandwidth Product	1	MHz
Current - Input Bias	45	nA
Voltage - Input Offset	2	mV
Current - Supply	800 (x2 Channels)	µA
Current - Output / Channel	40	mA
Voltage - Supply Span (Min)	3	V
Voltage - Supply Span (Max)	26	V
Operating Temperature	-40 to 85	°C
Mounting Type	Surface Mount	—
Package / Case	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)	—
Product Status	Obsolete	—
RoHS Status	RoHS non-compliant	—

Substitute Part Grouping Explanation

Substitution of the LM2904ADMR2 is determined by the following critical parameters:

Electrical Compatibility Criteria:

Dual-channel configuration (2 circuits required)
General-purpose amplifier topology
Gain bandwidth product of 1 MHz or greater
Supply voltage range encompassing 3V to 26V minimum
Input bias current ≤ 45 nA
Input offset voltage ≤ 2 mV
Output current per channel ≥ 40 mA
Operating temperature range including -40°C to 85°C

Mechanical Compatibility Criteria:

8-pin surface-mount package (8-MSOP or 8-TSSOP)
0.118" to 0.173" package width tolerance

Compliance Criteria:

RoHS3 compliance preferred for new designs
Moisture sensitivity level 1 (unlimited)

Substitute parts are grouped into two categories: Direct Replacements (identical electrical and mechanical specifications) and Enhanced Alternatives (superior performance characteristics while maintaining backward compatibility).

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	GBW (MHz)	Input Bias (nA)	Input Offset (mV)	Supply Current (µA)	Output Current (mA)	Supply Min (V)	Supply Max (V)	Temp Range (°C)	Product Status	RoHS Status
LM2904ADMR2	onsemi	General Purpose	1	45	2	800	40	3	26	-40 to 85	Obsolete	Non-compliant
LM2904ADMR2G	onsemi	General Purpose	1	45	2	800	40	3	26	-40 to 85	Active	ROHS3 Compliant
LM2904DGKR	Rohm Semiconductor	General Purpose	0.7	20	3	1000	40	3	26	-40 to 125	Not For New Designs	ROHS3 Compliant
LM2904ST	Rohm Semiconductor	General Purpose	0.7	20	1	600	30	3	32	-40 to 125	Active	ROHS3 Compliant
LM2904PT	Rohm Semiconductor	General Purpose	0.8	20	1	600	30	3	32	-40 to 125	Active	ROHS3 Compliant
BA3404FVM-TR	Rohm Semiconductor	General Purpose	1.2	70	2	2000	30	4	36	-40 to 85	Active	ROHS3 Compliant
LM358APT	STMicroelectronics	General Purpose	1.1	20	1	700	40	3	30	0 to 70	Active	ROHS3 Compliant
AD8022ARMZ	Analog Devices Inc.	Voltage Feedback	100	2500	1.5	4000	55	4.5	26	-40 to 85	Active	ROHS3 Compliant
ADA4062-2ARMZ	Analog Devices Inc.	J-FET	1.4	0.002	0.75	165	20	8	36	-40 to 125	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: LM2904ADMR2G

The LM2904ADMR2G is the direct functional equivalent of the LM2904ADMR2. It maintains identical electrical specifications (1 MHz gain bandwidth product, 45 nA input bias current, 2 mV input offset voltage, 3V to 26V supply range) while offering active product status and ROHS3 compliance. This part is the preferred choice for design continuity and component substitution.

Secondary Recommendation: LM2904ST

The LM2904ST is an active general-purpose dual operational amplifier with compatible supply voltage range (3V to 32V) and output current capability (30 mA per channel). It features improved input offset voltage (1 mV) and extended operating temperature range (-40°C to 125°C). The LM2904ST is suitable for applications where the slightly lower gain bandwidth product (700 kHz) and reduced output current are acceptable.

Alternative for Extended Temperature Range: LM2904DGKR

The LM2904DGKR provides extended operating temperature range (-40°C to 125°C) and maintains the 3V to 26V supply voltage compatibility. However, this part is classified as "Not For New Designs" and should be used only for legacy system support.

High-Performance Alternative: AD8022ARMZ

The AD8022ARMZ is a voltage feedback amplifier offering significantly enhanced performance characteristics: 100 MHz gain bandwidth product, 50 V/µs slew rate, and 55 mA output current per channel. This part is suitable for applications requiring higher bandwidth and faster signal processing. The minimum supply voltage is 4.5V, which may require circuit redesign for 3V single-supply applications.

Ultra-Low Input Bias Current Alternative: ADA4062-2ARMZ

The ADA4062-2ARMZ is a J-FET input amplifier with extremely low input bias current (2 pA) and low input offset voltage (750 µV). This part is recommended for high-impedance signal conditioning applications. The minimum supply voltage is 8V, requiring circuit redesign for lower voltage applications.

Automotive-Grade Option: LM358APT

The LM358APT is an automotive-qualified general-purpose dual operational amplifier (AEC-Q100 certified) with 1.1 MHz gain bandwidth product and 40 mA output current per channel. Operating temperature range is 0°C to 70°C. This part is suitable for automotive and industrial applications requiring qualification documentation.

Frequently Asked Questions (FAQ)

Q: Can the LM2904ADMR2G be used as a direct replacement for the LM2904ADMR2?

A: Yes. The LM2904ADMR2G is electrically and mechanically identical to the LM2904ADMR2. It maintains the same gain bandwidth product (1 MHz), input bias current (45 nA), input offset voltage (2 mV), supply voltage range (3V to 26V), and output current capability (40 mA per channel). The primary difference is active product status and ROHS3 compliance.

Q: What is the difference between the LM2904ADMR2 and LM2904ST?

A: The LM2904ST offers improved specifications in several areas: input offset voltage is reduced to 1 mV (versus 2 mV), operating temperature range is extended to -40°C to 125°C (versus -40°C to 85°C), and supply voltage maximum is increased to 32V (versus 26V). The gain bandwidth product is slightly lower at 700 kHz. The LM2904ST is suitable for applications where these trade-offs are acceptable.

Q: Can the AD8022ARMZ replace the LM2904ADMR2 in all applications?

A: The AD8022ARMZ is not a direct replacement. While it maintains the 8-MSOP package and dual-channel configuration, it is a voltage feedback amplifier with significantly different performance characteristics: 100 MHz gain bandwidth product (versus 1 MHz), 50 V/µs slew rate, and higher input bias current (2.5 µA versus 45 nA). Additionally, the minimum supply voltage is 4.5V, which may not be compatible with 3V single-supply designs. The AD8022ARMZ is suitable only for applications requiring higher bandwidth and faster response.

Q: Is the ADA4062-2ARMZ compatible with the LM2904ADMR2 supply voltage range?

A: No. The ADA4062-2ARMZ requires a minimum supply voltage of 8V, whereas the LM2904ADMR2 operates from 3V. This part is not suitable for 3V or 5V single-supply applications without circuit redesign. The ADA4062-2ARMZ is recommended only for applications with 8V or higher supply voltages where ultra-low input bias current is required.

Q: What is the significance of the package designation difference between 8-MSOP and 8-TSSOP?

A: Both 8-MSOP and 8-TSSOP are 8-pin surface-mount packages with similar pin configurations and footprints. The primary difference is package width: 8-MSOP is 0.118" (3.00mm) wide, while 8-TSSOP is 0.173" (4.40mm) wide. Parts specified as compatible with both package types can be used interchangeably on the same PCB layout. Verify PCB footprint compatibility before substitution.

Q: Why is the LM2904DGKR listed as "Not For New Designs"?

A: The "Not For New Designs" status indicates that the manufacturer is transitioning this part to obsolescence. While the part remains available and functional, it is not recommended for new product development. For new designs, use active alternatives such as LM2904ST or LM2904ADMR2G.

Q: What does RoHS3 compliance mean for component substitution?

A: RoHS3 compliance indicates that the component meets Restriction of Hazardous Substances Directive requirements, restricting the use of lead, cadmium, mercury, and other hazardous materials. The LM2904ADMR2 is RoHS non-compliant, while most active substitutes (LM2904ADMR2G, LM2904ST, AD8022ARMZ, ADA4062-2ARMZ) are ROHS3 compliant. For applications subject to environmental regulations or customer requirements, ROHS3-compliant parts are mandatory.

Q: Can multiple substitute parts be used interchangeably within the same design?

A: No. Each substitute part has distinct electrical characteristics. Once a specific substitute part is selected and validated in a design, changing to a different substitute requires re-qualification and testing. Interchangeability is limited to parts with identical specifications (such as LM2904ADMR2 and LM2904ADMR2G).

Q: What is the impact of input bias current differences on circuit performance?

A: Input bias current affects high-impedance signal conditioning circuits. The LM2904ADMR2 has 45 nA input bias current, while the ADA4062-2ARMZ has only 2 pA. For circuits with source impedances exceeding 1 MΩ, the lower input bias current of the ADA4062-2ARMZ reduces input offset voltage errors. For typical audio and general-purpose applications with source impedances below 100 kΩ, input bias current differences are negligible.

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