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LM2904MX Equivalent & Substitute Parts
Part Overview
The LM2904MX is a general-purpose operational amplifier featuring two circuits in an 8-SOP surface mount package, manufactured by Rohm Semiconductor. This device is classified as obsolete and operates across a supply voltage range of 3V to 26V with an operating temperature range of -40°C to 70°C. The LM2904MX is designed for applications requiring dual-channel amplification with moderate bandwidth and low input bias current characteristics.
Due to its obsolete product status, identifying equivalent and substitute parts is necessary for ongoing production support, design continuity, and component procurement. Substitute parts maintain functional compatibility while offering improved availability, extended temperature ranges, or enhanced electrical performance characteristics.
Substiute Parts
Key Parameters
| Parameter | LM2904MX Value | Unit |
|---|---|---|
| Amplifier Type | General Purpose | — |
| Number of Circuits | 2 | — |
| Slew Rate | 0.3 | V/µs |
| Gain Bandwidth Product | 1 | MHz |
| Current - Input Bias | 20 | nA |
| Voltage - Input Offset | 3 | mV |
| Current - Supply | 1 | mA |
| Current - Output / Channel | 40 | mA |
| Voltage - Supply Span (Min) | 3 | V |
| Voltage - Supply Span (Max) | 26 | V |
| Operating Temperature | -40 to 70 | °C |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) | — |
| Mounting Type | Surface Mount | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitute parts for the LM2904MX are classified into two categories based on electrical and mechanical compatibility:
Upgrade Substitutes maintain the core LM2904 base product number and preserve all critical electrical parameters including slew rate (0.3V/µs), gain bandwidth product (1 MHz or 700 kHz variants), input bias current (20 nA or 45 nA), input offset voltage (3 mV or 7 mV), output current per channel (40 mA), and supply voltage range (3V to 26V or 32V maximum). These parts are packaged in 8-SOIC surface mount configuration with identical mechanical dimensions (0.154", 3.90mm width). Upgrade substitutes offer extended operating temperature ranges (-40°C to 125°C) and improved product status compared to the obsolete LM2904MX.
Similar Parts share the same general-purpose amplifier architecture and dual-circuit configuration but are based on the LM258 product line. These parts maintain compatibility in package type (8-SOIC), mounting method (surface mount), output current capability (40 mA), and core supply voltage specifications. Similar parts operate within narrower temperature ranges (-25°C to 85°C) and feature comparable electrical performance with minor variations in input bias current and offset voltage specifications.
Substitution eligibility is determined by matching the following critical parameters: number of circuits (2), package type (8-SOIC), mounting method (surface mount), output current per channel (40 mA), and supply voltage compatibility (minimum 3V, maximum 26V or higher).
Parameter Comparison
| Parameter | LM2904MX | LM2904DR | LM2904DRG3 | LM2904DRG4 | LM2904QDR | LM2904QDRG4 | LM2904VDR2G | NCV2904DR2G | LM258ADR | LM258DG4 | LM258DR |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | Rohm | Rohm | TI | TI | TI | TI | onsemi | onsemi | TI | TI | UMW |
| Amplifier Type | General Purpose | General Purpose | General Purpose | General Purpose | General Purpose | General Purpose | General Purpose | General Purpose | General Purpose | General Purpose | General Purpose |
| Number of Circuits | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
| Slew Rate (V/µs) | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | — | 0.6 | 0.3 | 0.3 | — |
| Gain Bandwidth Product (MHz) | 1 | 0.7 | 0.7 | 0.7 | 0.7 | 0.7 | 1 | 1 | 0.7 | 1.1 | — |
| Current - Input Bias (nA) | 20 | 20 | 20 | 20 | 20 | 20 | 45 | 45 | 15 | 20 | 45 |
| Voltage - Input Offset (mV) | 3 | 3 | 3 | 3 | 3 | 3 | 7 | 7 | 2 | 3 | 2 |
| Current - Supply (mA) | 1 | 1 | 0.5 (x2) | 0.5 (x2) | 0.5 (x2) | 0.5 (x2) | 1.5 (x2) | 1.5 (x2) | 0.5 (x2) | 0.5 (x2) | 1 |
| Current - Output / Channel (mA) | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 40 |
| Voltage - Supply Span Min (V) | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | — |
| Voltage - Supply Span Max (V) | 26 | 26 | 26 | 26 | 26 | 26 | 32 | 32 | 32 | 32 | 32 |
| Operating Temperature (°C) | -40 to 70 | -40 to 125 | -40 to 125 | -40 to 125 | -40 to 125 | -40 to 125 | -40 to 125 | -40 to 125 | -25 to 85 | -25 to 85 | -25 to 85 |
| Package / Case | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Product Status | Obsolete | Not For New Designs | Last Time Buy | Obsolete | Active | Last Time Buy | Active | Active | Active | Obsolete | Active |
Engineering Selection Recommendations
Primary Upgrade Substitute: LM2904QDR
The LM2904QDR manufactured by Texas Instruments is the recommended primary substitute for the LM2904MX. This part maintains full electrical compatibility with identical slew rate (0.3V/µs), gain bandwidth product (700 kHz), input bias current (20 nA), input offset voltage (3 mV), and output current per channel (40 mA). The LM2904QDR operates across the same supply voltage range (3V to 26V) and is housed in the identical 8-SOIC package. The device holds Active product status, ensuring long-term availability and manufacturing support. Extended operating temperature range (-40°C to 125°C) provides enhanced thermal performance compared to the LM2904MX. ROHS3 compliance and MSL Level 1 certification maintain regulatory and environmental standards.
Secondary Upgrade Substitute: LM2904VDR2G
The LM2904VDR2G manufactured by onsemi provides an alternative upgrade path with enhanced electrical performance. This part features a higher gain bandwidth product (1 MHz) matching the original LM2904MX specification, while maintaining identical slew rate (0.3V/µs), output current per channel (40 mA), and package configuration (8-SOIC). The device supports an extended maximum supply voltage (32V versus 26V) and operates across the full industrial temperature range (-40°C to 125°C). Input bias current is specified at 45 nA with input offset voltage of 7 mV, representing acceptable variations within general-purpose amplifier tolerances. Active product status and ROHS3 compliance ensure ongoing availability.
Tertiary Upgrade Substitute: NCV2904DR2G
The NCV2904DR2G manufactured by onsemi offers the highest slew rate performance (0.6V/µs) among available substitutes while maintaining 1 MHz gain bandwidth product. This part is supplied in Tape & Reel packaging and features the same 8-SOIC package configuration. Extended supply voltage range (32V maximum) and full industrial temperature operation (-40°C to 125°C) provide design flexibility. Active product status and high inventory availability (655,300 pieces) support production continuity. Input bias current specification (45 nA) and input offset voltage (7 mV) remain within acceptable ranges for general-purpose applications.
Similar Alternative: LM258ADR
The LM258ADR manufactured by Texas Instruments represents a similar alternative based on the LM258 product family. This part maintains the same dual-circuit configuration, 8-SOIC package, and 40 mA output current per channel. Operating temperature range is restricted to -25°C to 85°C, limiting use in extended temperature applications. Input bias current is specified at 15 nA with 2 mV input offset voltage, representing improved precision characteristics. Supply voltage range extends to 32V maximum. Active product status and substantial inventory (27,600 pieces) ensure availability. This part is suitable for applications not requiring the full -40°C lower temperature limit of the LM2904MX.
Compliance and Regulatory Status
All substitute parts maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage procedures. REACH unaffected status and EAR99 export classification are consistent across all alternatives. These certifications support deployment in regulated industries and international markets without additional qualification requirements.
Frequently Asked Questions (FAQ)
Q: Can the LM2904QDR directly replace the LM2904MX in existing designs?
A: Yes. The LM2904QDR maintains electrical compatibility across all critical parameters including slew rate (0.3V/µs), input bias current (20 nA), input offset voltage (3 mV), output current per channel (40 mA), and supply voltage range (3V to 26V). The 8-SOIC package dimensions are identical (0.154", 3.90mm width). The extended operating temperature range (-40°C to 125°C) provides enhanced thermal performance. No circuit modifications are required for direct substitution.
Q: What is the difference between the LM2904VDR2G and LM2904QDR?
A: Both parts are LM2904 base product variants with identical slew rate (0.3V/µs) and package configuration (8-SOIC). The LM2904VDR2G is manufactured by onsemi and features 1 MHz gain bandwidth product with 45 nA input bias current. The LM2904QDR is manufactured by Texas Instruments with 700 kHz gain bandwidth product and 20 nA input bias current. The LM2904VDR2G supports higher maximum supply voltage (32V versus 26V). Selection depends on bandwidth requirements and manufacturer preference.
Q: Why does the NCV2904DR2G have a higher slew rate (0.6V/µs) than the LM2904MX (0.3V/µs)?
A: The NCV2904DR2G represents an enhanced variant of the LM2904 architecture with improved slew rate performance. Higher slew rate enables faster signal transitions and improved frequency response characteristics. This enhancement is compatible with existing LM2904 designs and does not introduce incompatibility. Applications sensitive to slew rate limitations benefit from this performance improvement.
Q: Can the LM258ADR be used as a substitute for the LM2904MX?
A: The LM258ADR is a similar alternative rather than a direct upgrade substitute. Both parts share the same dual-circuit general-purpose amplifier architecture, 8-SOIC package, and 40 mA output current per channel. The LM258ADR operates within a narrower temperature range (-25°C to 85°C) compared to the LM2904MX (-40°C to 70°C). Input bias current is lower (15 nA versus 20 nA) and input offset voltage is lower (2 mV versus 3 mV). Substitution is suitable for applications not requiring extended low-temperature operation below -25°C.
Q: What is the significance of the product status classifications (Active, Last Time Buy, Obsolete)?
A: Product status indicates manufacturing and availability status. Active status confirms ongoing production and long-term availability. Last Time Buy status indicates limited production with a defined end date; components remain available but in declining quantities. Obsolete status indicates production has ended; components are available only from existing inventory. For new designs, Active status parts (LM2904QDR, LM2904VDR2G, NCV2904DR2G, LM258ADR) are preferred. Last Time Buy parts (LM2904DRG3, LM2904QDRG4) support existing production with defined supply windows.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All substitute parts listed maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating. REACH unaffected status is consistent across all alternatives. These certifications ensure compatibility with standard manufacturing processes and regulatory requirements in all markets.
Q: What packaging options are available for LM2904 substitutes?
A: Substitute parts are available in Cut Tape (CT) & Digi-Reel packaging, Tape & Reel (TR) packaging, and Tube packaging. All parts maintain the identical 8-SOIC surface mount package configuration (0.154", 3.90mm width). Packaging selection depends on production volume and assembly equipment compatibility. Cut Tape and Digi-Reel options support lower-volume production. Tape & Reel packaging supports high-volume automated assembly. Tube packaging is available for selected parts.
Q: How do input bias current and input offset voltage variations affect circuit performance?
A: Input bias current and input offset voltage are DC characteristics that affect precision and accuracy in analog circuits. The LM2904MX specifies 20 nA input bias current and 3 mV input offset voltage. Substitute parts with higher values (LM2904VDR2G and NCV2904DR2G at 45 nA and 7 mV respectively) remain within acceptable ranges for general-purpose amplifier applications. Applications requiring precision instrumentation or low-offset performance should select parts with lower specifications (LM258ADR at 15 nA and 2 mV). Offset voltage can be trimmed in circuit designs requiring higher precision.
Q: What is the maximum supply voltage for each substitute part?
A: The LM2904MX supports maximum supply voltage of 26V. Most LM2904 variants (LM2904DR, LM2904DRG3, LM2904DRG4, LM2904QDR, LM2904QDRG4) maintain this 26V maximum. Enhanced variants (LM2904VDR2G, NCV2904DR2G) and LM258 alternatives (LM258ADR, LM258DG4, LM258DR) support extended maximum supply voltage of 32V. Applications operating at supply voltages above 26V require selection of parts with 32V maximum rating.
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