LM2904DG Equivalent & Substitute Parts

Part Overview

The LM2904DG is a general-purpose operational amplifier featuring two circuits in an 8-SOIC surface mount package, manufactured by onsemi. This device is classified as obsolete, necessitating identification of equivalent and substitute components for ongoing design requirements and production continuity. The LM2904DG operates across a supply voltage range of 3 V to 26 V with a gain bandwidth product of 1 MHz, making it suitable for general-purpose amplification applications requiring dual-channel configurations.

Key Parameters

Parameter	Value
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	800µA (x2 Channels)
Current - Output / Channel	40 mA
Voltage - Supply Span (Min)	3 V
Voltage - Supply Span (Max)	26 V
Operating Temperature	-40°C ~ 85°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the LM2904DG is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Amplifier Type: General Purpose
Number of Circuits: 2
Package / Case: 8-SOIC with 0.154" (3.90mm) width
Mounting Type: Surface Mount
Voltage - Supply Span (Min): 3 V minimum
Voltage - Supply Span (Max): 26 V or greater
Operating Temperature: -40°C to 85°C minimum coverage
Current - Output / Channel: 40 mA or greater
Gain Bandwidth Product: 1 MHz or greater
RoHS3 Compliance

Direct Substitutes maintain identical electrical specifications and package dimensions, enabling pin-for-pin replacement without circuit modification.

Similar Substitutes share the same functional category (general-purpose dual-channel amplifier) and package family but may exhibit variations in secondary parameters such as slew rate, input bias current, or supply current. These components require circuit evaluation to confirm compatibility with specific application requirements.

Parameter Comparison

Part Number	Manufacturer	Product Status	Amplifier Type	Number of Circuits	Gain Bandwidth Product	Current - Input Bias	Voltage - Input Offset	Current - Supply	Current - Output / Channel	Voltage - Supply Span (Min)	Voltage - Supply Span (Max)	Operating Temperature	Package / Case
LM2904DG	onsemi	Obsolete	General Purpose	2	1 MHz	45 nA	2 mV	800µA (x2)	40 mA	3 V	26 V	-40°C ~ 85°C	8-SOIC (0.154", 3.90mm)
LM2904DR2G	onsemi	Active	General Purpose	2	1 MHz	45 nA	2 mV	800µA (x2)	40 mA	3 V	26 V	-40°C ~ 85°C	8-SOIC (0.154", 3.90mm)
LM2904MX/NOPB	Texas Instruments	Active	General Purpose	2	1 MHz	45 nA	2 mV	1mA	40 mA	3 V	32 V	-40°C ~ 85°C	8-SOIC (0.154", 3.90mm)
LM2904YDT	STMicroelectronics	Active	General Purpose	2	700 kHz	20 nA	2 mV	700µA	30 mA	3 V	30 V	-40°C ~ 125°C	8-SOIC (0.154", 3.90mm)
BA10358F-E1	Rohm Semiconductor	Active	General Purpose	2	500 kHz	45 nA	2 mV	700µA	20 mA	3 V	32 V	-40°C ~ 85°C	8-SOIC (0.173", 4.40mm)
BA10358F-E2	Rohm Semiconductor	Active	General Purpose	2	500 kHz	45 nA	2 mV	700µA	20 mA	3 V	32 V	-40°C ~ 85°C	8-SOIC (0.173", 4.40mm)
BA2904F-E2	Rohm Semiconductor	Active	General Purpose	2	500 kHz	20 nA	2 mV	500µA	30 mA	3 V	32 V	-40°C ~ 125°C	8-SOIC (0.173", 4.40mm)
BA2904YF-MGE2	Rohm Semiconductor	Active	General Purpose	2	500 kHz	20 nA	2 mV	500µA	30 mA	3 V	36 V	-40°C ~ 125°C	8-SOIC (0.173", 4.40mm)
BA3404F-E2	Rohm Semiconductor	Active	General Purpose	2	1.2 MHz	70 nA	2 mV	2mA	30 mA	4 V	36 V	-40°C ~ 85°C	8-SOIC (0.173", 4.40mm)
ICL7621BCSA+	Analog Devices Inc./Maxim Integrated	Active	CMOS	2	1.4 MHz	1 pA	5 mV	1mA (x2)	Not specified	2 V	16 V	0°C ~ 70°C	8-SOIC (0.154", 3.90mm)
ICL7621BCSA+T	Analog Devices Inc./Maxim Integrated	Active	CMOS	2	1.4 MHz	1 pA	5 mV	1mA (x2)	Not specified	2 V	16 V	0°C ~ 70°C	8-SOIC (0.154", 3.90mm)

Engineering Selection Recommendations

Direct Substitutes (Pin-Compatible Replacement):

The LM2904DR2G manufactured by onsemi is the primary direct substitute for the obsolete LM2904DG. Both components share identical electrical specifications, package dimensions, and operating parameters. The LM2904DR2G maintains active product status with substantial inventory availability (505,300 units), ensuring supply chain continuity. This component is ROHS3 compliant and suitable for immediate replacement without circuit redesign.

The LM2904MX/NOPB from Texas Instruments provides an alternative direct substitute with identical gain bandwidth product and output current specifications. This device extends the maximum supply voltage to 32 V and maintains active status with 35,400 units in stock. The slightly elevated supply current (1 mA versus 800µA) represents a minor operational difference within acceptable design margins for general-purpose applications.

Active Substitutes with Extended Temperature Range:

The LM2904YDT from STMicroelectronics offers extended operating temperature coverage (-40°C to 125°C) compared to the original specification (-40°C to 85°C). This component is AEC-Q100 qualified for automotive applications and maintains the identical 8-SOIC package footprint. The reduced gain bandwidth product (700 kHz) and output current (30 mA) require circuit evaluation for bandwidth-sensitive applications.

Similar Substitutes (Functional Equivalents):

The BA10358F-E1 and BA10358F-E2 from Rohm Semiconductor provide general-purpose dual-channel amplification in a slightly wider 8-SOIC package (0.173" versus 0.154"). These components feature reduced gain bandwidth product (500 kHz) and output current (20 mA), necessitating application-specific compatibility assessment.

The BA2904F-E2 and BA2904YF-MGE2 from Rohm Semiconductor offer extended temperature range (-40°C to 125°C) with automotive qualification (AEC-Q100) for the latter. These components feature lower supply current consumption (500µA) and reduced output current (30 mA) compared to the original specification.

The BA3404F-E2 from Rohm Semiconductor provides enhanced performance characteristics including higher gain bandwidth product (1.2 MHz) and push-pull output configuration. The minimum supply voltage requirement (4 V) and elevated supply current (2 mA) represent design considerations for low-voltage applications.

CMOS Alternatives:

The ICL7621BCSA+ and ICL7621BCSA+T from Analog Devices Inc./Maxim Integrated represent CMOS-based alternatives with rail-to-rail output capability and extremely low input bias current (1 pA). These components are limited to 16 V maximum supply voltage and 0°C to 70°C operating temperature range, restricting applicability to temperature-constrained designs within the reduced voltage envelope.

Frequently Asked Questions (FAQ)

Q: Can the LM2904DR2G directly replace the LM2904DG without circuit modification?

A: Yes. The LM2904DR2G is a direct pin-for-pin substitute with identical electrical specifications, package dimensions, and operating parameters. No circuit modification is required for replacement.

Q: What is the primary reason the LM2904DG is classified as obsolete?

A: The LM2904DG has reached end-of-life status. The LM2904DR2G and LM2904MX/NOPB are active alternatives from the same manufacturers, providing equivalent functionality with ongoing production and supply availability.

Q: Are the Rohm Semiconductor BA10358 and BA2904 series pin-compatible with the LM2904DG?

A: The Rohm components share the same functional category and 8-SOIC package family but feature a slightly wider package body (0.173" versus 0.154"). Physical PCB layout verification is required to confirm mechanical compatibility. Electrical specifications differ in gain bandwidth product and output current, requiring application assessment.

Q: What is the key difference between the LM2904YDT and the original LM2904DG?

A: The LM2904YDT extends the operating temperature range to 125°C and includes AEC-Q100 automotive qualification. The gain bandwidth product is reduced to 700 kHz, and output current is limited to 30 mA. These differences require evaluation for bandwidth-critical and high-current-output applications.

Q: Can the ICL7621BCSA+ replace the LM2904DG in all applications?

A: No. The ICL7621BCSA+ is a CMOS-based amplifier with maximum supply voltage of 16 V, compared to the LM2904DG specification of 26 V. The operating temperature range is also restricted to 0°C to 70°C. This component is suitable only for applications operating within these reduced electrical and thermal envelopes.

Q: What supply voltage range must be maintained for all substitute components?

A: All substitute components maintain a minimum supply voltage of 3 V. The maximum supply voltage varies by component: LM2904DG and LM2904DR2G support 26 V, while LM2904MX/NOPB and most Rohm alternatives support 32 V or greater. Application circuits must operate within the specified voltage envelope of the selected substitute.

Q: Are all listed substitute components ROHS3 compliant?

A: Yes. All substitute components listed in this reference document are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic component manufacturing and distribution.

Q: What is the significance of the package width specification (0.154" versus 0.173")?

A: The package width specification indicates the physical body dimension of the 8-SOIC component. The LM2904DG uses 0.154" width, while some Rohm alternatives use 0.173" width. PCB layout and component placement must accommodate the selected package width to ensure proper fit within the circuit board footprint.

Q: Which substitute offers the lowest power consumption?

A: The BA2904F-E2 and BA2904YF-MGE2 from Rohm Semiconductor feature the lowest supply current at 500µA, compared to 800µA for the original LM2904DG. The ICL7621BCSA+ series also operates at 1 mA total supply current but is limited to 16 V maximum supply voltage.

Q: Is the LM2904MX/NOPB suitable for applications requiring 32 V supply voltage?

A: Yes. The LM2904MX/NOPB supports maximum supply voltage of 32 V, exceeding the original LM2904DG specification of 26 V. This component is suitable for applications requiring extended voltage headroom within the 32 V envelope.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message