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LM2904DT Equivalent & Substitute Parts
Part Overview
The LM2904DT is a general-purpose operational amplifier featuring two circuits in an 8-SOIC surface mount package, manufactured by Rohm Semiconductor. This device is classified as "Not For New Designs," indicating it has reached end-of-life status. The part operates across a wide supply voltage range of 3V to 32V with an operating temperature range of -40°C to 125°C, making it suitable for legacy applications requiring dual-channel amplification in compact form factors.
Due to its discontinued status, identifying functionally equivalent or superior alternatives is necessary for design continuity, component sourcing, and long-term system reliability. Substitute parts must maintain compatibility with existing circuit designs while meeting or exceeding the electrical performance specifications of the original component.
Substiute Parts
Key Parameters
| Parameter | LM2904DT Value | Unit |
|---|---|---|
| Amplifier Type | General Purpose | — |
| Number of Circuits | 2 | — |
| Slew Rate | 0.3 | V/µs |
| Gain Bandwidth Product | 700 | kHz |
| Current - Input Bias | 20 | nA |
| Voltage - Input Offset | 1 | mV |
| Current - Supply | 600 | µA |
| Current - Output / Channel | 30 | mA |
| Voltage - Supply Span (Min) | 3 | V |
| Voltage - Supply Span (Max) | 32 | V |
| Operating Temperature Range | -40 to 125 | °C |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) | — |
| Mounting Type | Surface Mount | — |
| RoHS Status | ROHS3 Compliant | — |
Substitute Part Grouping Explanation
Substitution logic for the LM2904DT is based on the following critical parameters that must be maintained or improved for direct replacement:
Primary Compatibility Criteria:
- Number of circuits: Must equal 2
- Package type: Must be 8-SOIC (0.154", 3.90mm Width)
- Mounting type: Must be Surface Mount
- Supply voltage range: Minimum 3V to maximum 32V (or compatible subset)
- Operating temperature range: Must cover -40°C to 125°C or be suitable for the intended application temperature window
Performance Consideration Parameters:
- Slew rate, gain bandwidth product, input bias current, input offset voltage, supply current, and output current per channel determine whether a substitute provides equivalent or enhanced performance
- Amplifier type (General Purpose vs. J-FET) affects input impedance and noise characteristics but does not preclude substitution if electrical parameters are compatible
Substitute parts are grouped into two categories:
- General Purpose Amplifiers (LM258 series, LM1458 series, LM158 series): Direct functional equivalents with similar or improved electrical characteristics, maintaining the same amplifier topology
- J-FET Input Amplifiers (ADA4062 series): Enhanced performance alternatives with superior input bias current and offset voltage specifications, suitable for applications requiring lower input current and higher input impedance
Parameter Comparison
| Parameter | LM2904DT | LM258ADR | LM258D | LM158DT | LM1458M/NOPB | ADA4062-2ARZ | ADA4062-2BRZ |
|---|---|---|---|---|---|---|---|
| Manufacturer | Rohm Semiconductor | Texas Instruments | STMicroelectronics | STMicroelectronics | Texas Instruments | Analog Devices Inc. | Analog Devices Inc. |
| Amplifier Type | General Purpose | General Purpose | General Purpose | General Purpose | General Purpose | J-FET | J-FET |
| Number of Circuits | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
| Slew Rate (V/µs) | 0.3 | 0.3 | 0.6 | 0.6 | 0.5 | 3.3 | 3.3 |
| Gain Bandwidth Product (kHz) | 700 | 700 | 1100 | 1100 | 1000 | 1400 | 1400 |
| Current - Input Bias (nA) | 20 | 15 | 20 | 20 | 200 | 2 | 2 |
| Voltage - Input Offset (mV) | 1 | 2 | 5 | 5 | 1 | 0.75 | 0.5 |
| Current - Supply (µA) | 600 | 500 | 700 | 700 | 3000 | 165 | 165 |
| Current - Output / Channel (mA) | 30 | 40 | 40 | 40 | — | 20 | 20 |
| Voltage - Supply Span Min (V) | 3 | 3 | 3 | 3 | 36 | 8 | 8 |
| Voltage - Supply Span Max (V) | 32 | 32 | 30 | 30 | 36 | 36 | 36 |
| Operating Temperature Range (°C) | -40 to 125 | -25 to 85 | -40 to 105 | -55 to 125 | 0 to 70 | -40 to 125 | -40 to 125 |
| Package / Case | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Product Status | Not For New Designs | Active | Active | Active | Active | Active | Active |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
Engineering Selection Recommendations
For Direct Replacement with Equivalent Performance:
The LM258ADR (Texas Instruments) provides the closest electrical match to the LM2904DT. Both devices share identical slew rate (0.3V/µs) and gain bandwidth product (700 kHz) specifications, with comparable input bias current (15 nA vs. 20 nA) and input offset voltage (2 mV vs. 1 mV). The LM258ADR maintains the same supply voltage range (3V to 32V) and output current capability (40 mA vs. 30 mA per channel). This part is actively manufactured and ROHS3 compliant, making it suitable for production environments requiring component continuity.
For Enhanced Performance with Extended Temperature Range:
The LM158DT (STMicroelectronics) offers improved slew rate (0.6V/µs) and gain bandwidth product (1.1 MHz) while maintaining the full -40°C to 125°C operating temperature range of the original LM2904DT. The LM158DT is AEC-Q100 qualified for automotive applications and provides higher output current capability (40 mA per channel). Supply voltage range is slightly reduced to 3V to 30V, which remains compatible with most applications. This part is actively produced and ROHS3 compliant.
For Superior Input Characteristics:
The ADA4062-2ARZ and ADA4062-2BRZ (Analog Devices Inc.) represent J-FET input alternatives with dramatically improved input bias current (2 pA vs. 20 nA) and lower input offset voltage (750 µV to 500 µV). These devices provide higher slew rate (3.3V/µs) and gain bandwidth product (1.4 MHz), supporting applications requiring minimal input current draw and high-impedance signal sources. The ADA4062 series operates across -40°C to 125°C and supports supply voltages from 8V to 36V. Both variants are actively manufactured and ROHS3 compliant. The ADA4062-2BRZ variant offers tighter input offset voltage specification (500 µV) for precision applications.
For Legacy System Continuity:
The LM258D (STMicroelectronics) provides an alternative general-purpose option with improved performance characteristics (0.6V/µs slew rate, 1.1 MHz gain bandwidth product) while maintaining compatibility with the original supply voltage range (3V to 30V). Operating temperature range extends to -40°C to 105°C. This part is actively available and ROHS3 compliant.
Compliance and Regulatory Considerations:
All recommended substitute parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements. The LM158DT carries AEC-Q100 automotive qualification, making it suitable for automotive and harsh environment applications. All parts maintain the same 8-SOIC package footprint and surface mount mounting type, enabling direct PCB layout compatibility without redesign.
Frequently Asked Questions (FAQ)
Q: Can the LM258ADR be used as a direct drop-in replacement for the LM2904DT?
A: The LM258ADR is electrically compatible with the LM2904DT for most applications. Both devices share identical slew rate (0.3V/µs) and gain bandwidth product (700 kHz), operate across the same supply voltage range (3V to 32V), and use the same 8-SOIC package. The primary difference is the operating temperature range: LM258ADR operates from -25°C to 85°C, while LM2904DT operates from -40°C to 125°C. If your application requires the full -40°C to 125°C range, the LM158DT or ADA4062 series are more appropriate selections.
Q: What is the difference between general-purpose and J-FET input amplifiers?
A: General-purpose amplifiers (LM258, LM158, LM1458 series) use bipolar input stages, resulting in higher input bias current (typically 15-200 nA) but lower cost and simpler biasing requirements. J-FET input amplifiers (ADA4062 series) use field-effect transistor input stages, providing extremely low input bias current (2 pA) and high input impedance, making them suitable for high-impedance signal sources and applications where input current must be minimized. Both types are functionally compatible in 8-SOIC packages but differ in input characteristics.
Q: Does the ADA4062 series require different circuit design compared to the LM2904DT?
A: The ADA4062 series maintains the same pinout and basic operational amplifier functionality as the LM2904DT, requiring no circuit redesign for basic applications. However, the ADA4062 series has a higher minimum supply voltage (8V vs. 3V for LM2904DT), so applications operating below 8V cannot use this substitute. The superior input bias current and offset voltage specifications of the ADA4062 may allow simplified biasing networks in precision applications, but existing designs will function without modification.
Q: Why does the LM1458M/NOPB have a different supply voltage specification?
A: The LM1458M/NOPB specifies a fixed supply voltage of 36V (listed as both minimum and maximum), indicating this part is designed for a specific 36V supply configuration rather than a variable range. This differs from the LM2904DT, which supports 3V to 32V operation. The LM1458 is not recommended as a substitute unless your application specifically requires 36V operation. The LM258ADR or LM158DT are more appropriate for applications requiring variable supply voltage ranges.
Q: What is the significance of the ADA4062-2BRZ variant with 500 µV input offset voltage?
A: The ADA4062-2BRZ offers a tighter input offset voltage specification (500 µV) compared to the ADA4062-2ARZ (750 µV). This improved specification is beneficial for precision instrumentation, data acquisition, and signal conditioning applications where input offset voltage directly affects measurement accuracy. Both variants are electrically identical in all other parameters and use the same 8-SOIC package. Selection between these variants depends on the precision requirements of your specific application.
Q: Are all substitute parts available in the same packaging options as the LM2904DT?
A: The LM2904DT is available in Cut Tape (CT) & Digi-Reel® packaging. Substitute parts are available in various packaging formats: LM258ADR and LM158DT are available in Cut Tape & Digi-Reel®; LM258D and LM1458M/NOPB are available in Tube; ADA4062-2ARZ is available in Tube; ADA4062-2ARZ-R7 is available in Cut Tape & Digi-Reel®; ADA4062-2ARZ-RL and ADA4062-2BRZ-R7 are available in Tape & Reel (TR); ADA4062-2BRZ is available in Tube. Verify packaging availability with your supplier to match your assembly requirements.
Q: Can I use the LM158DT in applications requiring the full -40°C to 125°C temperature range?
A: Yes. The LM158DT operates across the full -40°C to 125°C temperature range, matching the LM2904DT specification. Additionally, the LM158DT is AEC-Q100 qualified, making it suitable for automotive and industrial applications requiring extended temperature operation. The LM158DT provides improved performance (0.6V/µs slew rate, 1.1 MHz gain bandwidth product) compared to the LM2904DT while maintaining supply voltage compatibility (3V to 30V).
Q: What is the impact of lower supply current in the ADA4062 series?
A: The ADA4062 series draws significantly lower supply current (165 µA per channel) compared to the LM2904DT (600 µA total). This reduced power consumption is advantageous for battery-powered applications, portable instrumentation, and systems with strict power budgets. The lower supply current does not affect output capability or signal fidelity; it simply reduces overall system power dissipation and extends battery life in portable applications.
Q: Are there any pinout differences between the LM2904DT and substitute parts?
A: All substitute parts listed maintain the same 8-SOIC pinout as the LM2904DT. No PCB layout modifications or pin reassignment is required for direct replacement. The identical pinout ensures mechanical and electrical compatibility without design changes.
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