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LM2904WD Equivalent & Substitute Parts
Part Overview
The LM2904WD is a general-purpose operational amplifier featuring two circuits in a single 8-SOIC surface-mount package, manufactured by STMicroelectronics. This device is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and production requirements. The LM2904WD operates across a wide supply voltage range (3V to 30V) and maintains performance across industrial temperature ranges (-40°C to 125°C), making it suitable for general analog signal processing applications.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Amplifier Type | General Purpose | — |
| Number of Circuits | 2 | — |
| Output Type | Single-Ended | — |
| Slew Rate | 0.6 | V/µs |
| Gain Bandwidth Product | 1.1 | MHz |
| Current - Input Bias | 20 | nA |
| Voltage - Input Offset | 2 | mV |
| Current - Supply | 700 | µA |
| Current - Output / Channel | 40 | mA |
| Voltage - Supply Span (Min) | 3 | V |
| Voltage - Supply Span (Max) | 30 | V |
| Operating Temperature | -40 to 125 | °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
Substitution of the LM2904WD is determined by strict alignment of electrical and mechanical parameters. The following criteria establish functional equivalence:
Primary Substitution Criteria:
- Dual-circuit general-purpose operational amplifier architecture
- 8-SOIC surface-mount package (0.154" width, 3.90mm)
- Minimum supply voltage span of 3V
- Maximum supply voltage span of 26V or greater
- Input bias current of 20 nA
- Input offset voltage of 1 mV to 3 mV
- Output current per channel of 30 mA or greater
- Operating temperature range including -40°C to 125°C
- RoHS3 compliance and MSL rating of 1 or 3
Secondary Compatibility Factors:
- Slew rate of 0.2V/µs to 0.6V/µs
- Gain bandwidth product of 500 kHz to 1.1 MHz
- Supply current of 500µA to 700µA
Substitutes are grouped by product status (Active, Discontinued, Last Time Buy, Obsolete) to guide procurement strategy. Active parts with full availability are prioritized for new designs, while discontinued variants serve legacy system support.
Parameter Comparison
| Part Number | Manufacturer | Product Status | Slew Rate (V/µs) | GBW (MHz) | Input Bias (nA) | Input Offset (mV) | Supply Current (µA) | Output Current (mA) | Supply Min (V) | Supply Max (V) | Temp Range (°C) | Package |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| LM2904WD | STMicroelectronics | Obsolete | 0.6 | 1.1 | 20 | 2 | 700 | 40 | 3 | 30 | -40 to 125 | 8-SOIC |
| LM2904WDT | Rohm Semiconductor | Obsolete | 0.3 | 1.1 | 20 | 1 | 600 | 40 | 3 | 32 | -40 to 125 | 8-SOIC |
| AS358MTR-E1 | Diodes Incorporated | Active | — | — | 20 | 2 | 700 | 40 | 3 | 36 | -40 to 85 | 8-SOIC |
| BA2904SF-E2 | Rohm Semiconductor | Active | 0.2 | 0.5 | 20 | 2 | 500 | 30 | 3 | 32 | -40 to 105 | 8-SOIC |
| LM2904AVQDR | Texas Instruments | Active | 0.3 | 0.7 | 20 | 1 | 500 | 40 | 3 | 30 | -40 to 125 | 8-SOIC |
| LM2904AVQDRG4 | Texas Instruments | Discontinued at DiGi Electronics | 0.3 | 0.7 | 20 | 1 | 500 | 40 | 3 | 30 | -40 to 125 | 8-SOIC |
| LM2904AVQDRG4Q1 | Texas Instruments | Active | 0.3 | 0.7 | 20 | 1 | 500 | 30 | 3 | 26 | -40 to 125 | 8-SOIC |
| LM2904AVQDRQ1 | Texas Instruments | Active | 0.3 | 0.7 | 20 | 1 | 500 | 30 | 3 | 26 | -40 to 125 | 8-SOIC |
| LM2904QDR | Texas Instruments | Active | 0.3 | 0.7 | 20 | 3 | 500 | 40 | 3 | 26 | -40 to 125 | 8-SOIC |
| LM2904QDRG4 | Texas Instruments | Last Time Buy | 0.3 | 0.7 | 20 | 3 | 500 | 40 | 3 | 26 | -40 to 125 | 8-SOIC |
| LM2904QDRG4Q1 | Texas Instruments | Active | 0.3 | 0.7 | 20 | 3 | 500 | 30 | 3 | 26 | -40 to 125 | 8-SOIC |
Engineering Selection Recommendations
For Active Production and New Designs:
The LM2904AVQDR (Texas Instruments) is the primary recommended substitute. This part maintains full compatibility with the LM2904WD across all critical electrical parameters, including the complete -40°C to 125°C operating temperature range and 3V to 30V supply span. The device is currently in active production with substantial inventory availability (35,200 units). RoHS3 compliance and MSL-1 rating ensure compatibility with modern manufacturing processes.
For Automotive Applications:
The LM2904AVQDRQ1 and LM2904QDRG4Q1 (both Texas Instruments) are qualified to AEC-Q100 automotive standards and carry the Q1 designation. These variants are suitable for automotive-grade designs requiring formal qualification documentation. Supply voltage maximum is reduced to 26V, which remains compatible with standard automotive 12V and 24V systems.
For Legacy System Support:
The LM2904WDT (Rohm Semiconductor) provides an obsolete-to-obsolete substitution path with minimal parameter deviation. This part is suitable only when exact historical equivalence is required for repair or maintenance of existing systems. The device supports supply voltages up to 32V and maintains the 1.1 MHz gain bandwidth product of the original LM2904WD.
For Cost-Optimized Applications:
The BA2904SF-E2 (Rohm Semiconductor) offers active production status with lower supply current (500µA) and reduced output current per channel (30mA). This variant is appropriate for power-sensitive applications where the reduced performance specifications align with circuit requirements. Operating temperature range extends to 105°C, suitable for industrial environments.
For Extended Temperature Range:
The AS358MTR-E1 (Diodes Incorporated) provides the widest maximum supply voltage (36V) and is actively produced with high inventory (264,200 units). However, the operating temperature range is limited to -40°C to 85°C, making this part unsuitable for applications requiring the full 125°C upper limit of the original LM2904WD.
Frequently Asked Questions (FAQ)
Q: Can the LM2904AVQDR directly replace the LM2904WD without circuit modification?
A: The LM2904AVQDR is electrically compatible with the LM2904WD across all specified parameters within the overlapping operating ranges. Both devices feature identical 8-SOIC packaging, dual-circuit architecture, and support the full -40°C to 125°C temperature range. No circuit modification is required for direct substitution in applications operating within 3V to 30V supply range.
Q: What is the difference between LM2904AVQDR and LM2904AVQDRQ1?
A: The LM2904AVQDRQ1 carries AEC-Q100 automotive qualification and is designated for automotive-grade applications. The primary electrical difference is the reduced maximum supply voltage (26V versus 30V) and output current per channel (30mA versus 40mA). The LM2904AVQDR is suitable for industrial and commercial applications, while the Q1 variant is required for automotive designs.
Q: Why does the AS358MTR-E1 have a lower maximum operating temperature than the LM2904WD?
A: The AS358MTR-E1 is specified for -40°C to 85°C operation, which is a design characteristic of the Diodes Incorporated AS358 base product line. Applications requiring operation at temperatures above 85°C must use alternative substitutes such as the LM2904AVQDR or LM2904QDR, both of which support -40°C to 125°C.
Q: Is the LM2904WDT a suitable substitute despite being obsolete?
A: The LM2904WDT is obsolete and should be used only for legacy system maintenance where historical equivalence is mandatory. For new designs or ongoing production, active alternatives such as the LM2904AVQDR are strongly preferred due to continued manufacturing support and supply chain availability.
Q: What packaging considerations apply when substituting the LM2904WD?
A: All recommended substitutes use the 8-SOIC surface-mount package with 0.154" width and 3.90mm body dimension. This ensures mechanical compatibility with existing PCB layouts and assembly equipment. Verify that the specific supplier device package designation (8-SOIC, 8-SOP, or 8-SOP-J) is compatible with your assembly process, as minor dimensional variations may exist between manufacturers.
Q: Can the BA2904SF-E2 be used in high-current output applications?
A: The BA2904SF-E2 provides 30mA output current per channel, compared to 40mA for the LM2904WD. Applications requiring the full 40mA output capability must use alternatives such as the LM2904AVQDR, LM2904QDR, or LM2904QDRG4, which all support 40mA per channel.
Q: What is the significance of the MSL (Moisture Sensitivity Level) rating?
A: The LM2904WD carries MSL-1 (Unlimited), indicating no moisture sensitivity restrictions. Most recommended substitutes (LM2904AVQDR, LM2904QDR, LM2904AVQDRQ1, LM2904QDRG4Q1) also carry MSL-1 rating. The AS358MTR-E1 carries MSL-3 (168 Hours), requiring controlled storage and handling procedures. Verify MSL compatibility with your manufacturing environment and storage capabilities.
Q: Are there supply voltage limitations when substituting the LM2904WD?
A: The LM2904WD supports 3V to 30V supply range. Most substitutes maintain this range or extend it. However, the LM2904AVQDRQ1 and LM2904QDRG4Q1 are limited to 26V maximum, which is still compatible with standard industrial and automotive supply voltages. The AS358MTR-E1 extends to 36V maximum. Verify your circuit's supply voltage requirements against each substitute's specifications.
Q: What is the difference between Cut Tape (CT) and Tape & Reel (TR) packaging?
A: Cut Tape packaging is supplied in individual strips suitable for manual assembly or small-volume production. Tape & Reel packaging is supplied on continuous reels for automated high-volume assembly. Both formats contain identical components; the difference is in delivery and handling method. Select based on your production volume and assembly equipment capabilities.
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