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LM2904DR2 Equivalent & Substitute Parts
Part Overview
The LM2904DR2 is a general-purpose dual operational amplifier manufactured by onsemi in an 8-SOIC surface mount package. This device is classified as obsolete and is no longer recommended for new designs. The LM2904DR2 provides two independent amplifier circuits suitable for general-purpose signal conditioning, buffering, and amplification applications across industrial and consumer electronics.
Due to its obsolete status, identifying equivalent and substitute parts is necessary for design continuity, production support, and long-term component availability. Active alternatives with compatible electrical and mechanical specifications are available from multiple manufacturers.
Substiute Parts
Key Parameters
| Parameter | 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 (x2 Channels) | 800 | µA |
| Current - Output / Channel | 40 | mA |
| Voltage - Supply Span (Min) | 3 | V |
| Voltage - Supply Span (Max) | 26 | V |
| Operating Temperature Range | -40 to 85 | °C |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) | — |
| Mounting Type | Surface Mount | — |
| RoHS Status | RoHS non-compliant | — |
Substitute Part Grouping Explanation
Substitution of the LM2904DR2 is determined by the following critical parameters:
Electrical Compatibility Requirements:
- Dual-channel configuration (2 circuits minimum)
- General-purpose amplifier topology
- Gain bandwidth product of 1 MHz or greater
- Input bias current of 45 nA or lower
- Input offset voltage of 2 mV or lower
- Output current capability of 40 mA per channel or greater
- Supply voltage range spanning 3 V to 26 V minimum
- Operating temperature range of -40°C to 85°C or broader
Mechanical Compatibility Requirements:
- 8-SOIC surface mount package with 0.154" (3.90mm) width
- Pin-compatible footprint
Substitute parts are classified into two categories:
Direct Substitutes: Parts with identical electrical specifications and package compatibility, enabling drop-in replacement without circuit modification.
Similar Substitutes: Parts with comparable electrical performance within acceptable engineering tolerances but with variations in specific parameters such as slew rate, supply current, or amplifier topology. These require design review to confirm compatibility with application requirements.
Parameter Comparison
| Parameter | LM2904DR2 | LM2904DR2G | LM258DT | LM258YDT | LM1458MX/NOPB | BA3404F-E2 | ICL7621BCSA+ |
|---|---|---|---|---|---|---|---|
| Manufacturer | onsemi | onsemi | STMicroelectronics | STMicroelectronics | National Semiconductor | Rohm Semiconductor | Analog Devices Inc./Maxim Integrated |
| Product Status | Obsolete | Active | Active | Obsolete | Active | Active | Active |
| Amplifier Type | General Purpose | General Purpose | General Purpose | General Purpose | General Purpose | General Purpose | CMOS |
| Number of Circuits | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
| Gain Bandwidth Product (MHz) | 1 | 1 | 1.1 | 1.1 | 1 | 1.2 | 1.4 |
| Current - Input Bias (nA) | 45 | 45 | 20 | 20 | 200 | 70 | 1 |
| Voltage - Input Offset (mV) | 2 | 2 | 5 | 5 | 1 | 2 | 5 |
| Current - Supply (µA) | 800 | 800 | 700 | 700 | 3000 | 2000 | 1000 |
| Current - Output / Channel (mA) | 40 | 40 | 40 | 40 | — | 30 | — |
| Voltage - Supply Span Min (V) | 3 | 3 | 3 | 3 | 36 | 4 | 2 |
| Voltage - Supply Span Max (V) | 26 | 26 | 30 | 30 | 36 | 36 | 16 |
| Operating Temperature (°C) | -40 to 85 | -40 to 85 | -40 to 105 | -40 to 105 | 0 to 70 | -40 to 85 | 0 to 70 |
| Package / Case | 8-SOIC (0.154", 3.90mm) | 8-SOIC (0.154", 3.90mm) | 8-SOIC (0.154", 3.90mm) | 8-SOIC (0.154", 3.90mm) | 8-SOIC (0.154", 3.90mm) | 8-SOP (0.173", 4.40mm) | 8-SOIC (0.154", 3.90mm) |
| RoHS Status | RoHS non-compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | — | ROHS3 Compliant | ROHS3 Compliant |
Engineering Selection Recommendations
Primary Recommendation: LM2904DR2G
The LM2904DR2G is the direct successor to the LM2904DR2. Both parts share identical electrical specifications including gain bandwidth product (1 MHz), input bias current (45 nA), input offset voltage (2 mV), supply current (800 µA per channel), output current (40 mA per channel), and supply voltage range (3 V to 26 V). The LM2904DR2G is manufactured by onsemi and maintains the same 8-SOIC package footprint. The primary distinction is product status: LM2904DR2G is active and ROHS3 compliant, whereas the LM2904DR2 is obsolete and RoHS non-compliant. This part enables direct drop-in replacement without circuit modification.
Secondary Recommendation: LM258DT
The LM258DT manufactured by STMicroelectronics provides compatible dual-channel general-purpose amplification in the same 8-SOIC package. Electrical parameters are closely aligned: gain bandwidth product (1.1 MHz), input bias current (20 nA, lower than LM2904DR2), input offset voltage (5 mV, higher than LM2904DR2), supply current (700 µA per channel, lower than LM2904DR2), and output current (40 mA per channel, equivalent). Supply voltage range extends to 30 V maximum, exceeding the LM2904DR2 specification. Operating temperature range extends to 105°C. The LM258DT is active and ROHS3 compliant. This part is suitable for applications where lower input bias current and extended temperature range provide design advantages.
Tertiary Recommendation: ICL7621BCSA+ / ICL7621BCSA+T
The ICL7621BCSA+ and ICL7621BCSA+T manufactured by Analog Devices Inc./Maxim Integrated are CMOS-based dual-channel amplifiers in 8-SOIC packages. These parts feature significantly lower input bias current (1 pA, substantially lower than LM2904DR2), higher gain bandwidth product (1.4 MHz), and lower supply current (1 mA per channel). However, the supply voltage range is restricted to 2 V to 16 V maximum, which is narrower than the LM2904DR2 specification. Operating temperature range is limited to 0°C to 70°C for ICL7621BCSA+ and -40°C to 85°C for ICL7621BCSA+T. These parts are suitable for low-power applications with restricted supply voltage requirements.
Not Recommended for Direct Substitution:
- LM1458MX/NOPB: Supply voltage specification is fixed at 36 V (not a range), operating temperature limited to 0°C to 70°C, and input bias current (200 nA) significantly exceeds LM2904DR2 specification.
- BA3404F-E2: Package footprint differs (8-SOP 0.173" width versus 8-SOIC 0.154" width), output current per channel (30 mA) is below LM2904DR2 specification (40 mA), and supply voltage minimum (4 V) exceeds LM2904DR2 minimum (3 V).
- LM258YDT: Although electrically compatible, this part is classified as obsolete, limiting its suitability for long-term production support.
Frequently Asked Questions (FAQ)
Q: Can the LM2904DR2G be used as a direct replacement for the LM2904DR2?
A: Yes. The LM2904DR2G is electrically and mechanically identical to the LM2904DR2. Both parts feature the same gain bandwidth product (1 MHz), input bias current (45 nA), input offset voltage (2 mV), supply current (800 µA per channel), output current (40 mA per channel), and supply voltage range (3 V to 26 V). The LM2904DR2G is packaged in the same 8-SOIC footprint and requires no circuit modifications. The primary difference is that LM2904DR2G is active and ROHS3 compliant, whereas LM2904DR2 is obsolete.
Q: What are the key differences between the LM2904DR2 and the LM258DT?
A: The LM258DT offers lower input bias current (20 nA versus 45 nA), lower supply current (700 µA per channel versus 800 µA per channel), and extended maximum operating temperature (105°C versus 85°C). The LM258DT has a slightly higher input offset voltage (5 mV versus 2 mV) and marginally higher gain bandwidth product (1.1 MHz versus 1 MHz). Both parts are packaged in 8-SOIC and support the same output current (40 mA per channel). The LM258DT is active and ROHS3 compliant.
Q: Why is the ICL7621BCSA+ not recommended as a direct substitute?
A: The ICL7621BCSA+ has a restricted supply voltage range (2 V to 16 V maximum) compared to the LM2904DR2 (3 V to 26 V maximum). Applications requiring supply voltages above 16 V cannot use this part. Additionally, the operating temperature range is limited to 0°C to 70°C, which is narrower than the LM2904DR2 specification (-40°C to 85°C). The ICL7621BCSA+T variant extends the temperature range to -40°C to 85°C but retains the restricted supply voltage limitation.
Q: Are there package compatibility concerns with any substitute parts?
A: Yes. The BA3404F-E2 uses an 8-SOP package with 0.173" width, whereas the LM2904DR2 uses an 8-SOIC package with 0.154" width. These packages have different footprints and are not interchangeable on the same printed circuit board. All other recommended substitutes use the standard 8-SOIC package compatible with the LM2904DR2.
Q: What is the significance of RoHS compliance in selecting a substitute?
A: RoHS compliance indicates that the part meets Restriction of Hazardous Substances regulations, restricting the use of lead and other hazardous materials. The LM2904DR2 is RoHS non-compliant. Most active substitutes, including LM2904DR2G, LM258DT, and ICL7621BCSA+, are ROHS3 compliant. For applications subject to RoHS regulations or customer requirements, ROHS3-compliant parts are necessary.
Q: Can the LM2904DR2 be used in applications requiring extended temperature operation beyond 85°C?
A: No. The LM2904DR2 operating temperature range is specified as -40°C to 85°C. For applications requiring operation above 85°C, the LM258DT (operating to 105°C) or the LM2904DR variant manufactured by Rohm Semiconductor (operating to 125°C) should be evaluated. However, the Rohm LM2904DR is classified as "Not For New Designs," limiting its suitability for new product development.
Q: What is the impact of input bias current differences between substitute parts?
A: Input bias current affects the input impedance and can influence circuit performance in high-impedance signal conditioning applications. The LM2904DR2 has an input bias current of 45 nA. The LM258DT reduces this to 20 nA, and the ICL7621BCSA+ reduces it to 1 pA. Lower input bias current is advantageous in applications with high-impedance signal sources, as it reduces loading effects and improves measurement accuracy. Applications with low-impedance sources are less sensitive to input bias current variations.
Q: Is the LM1458MX/NOPB suitable as a substitute?
A: No. The LM1458MX/NOPB has a fixed supply voltage specification of 36 V (not a range), which differs from the LM2904DR2 range of 3 V to 26 V. Additionally, the input bias current (200 nA) significantly exceeds the LM2904DR2 specification (45 nA), and the operating temperature range (0°C to 70°C) is narrower than the LM2904DR2 range (-40°C to 85°C). This part is not recommended for substitution.
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