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LM2904M Equivalent & Substitute Parts
Part Overview
The LM2904M is a general-purpose operational amplifier featuring two circuits in an 8-SOIC surface mount package, manufactured by Texas Instruments. This device is classified as obsolete, which necessitates identification of active equivalent and substitute parts for ongoing design support and procurement. The LM2904M operates across a supply voltage range of 3V to 32V with a gain bandwidth product of 1 MHz and is suitable for general-purpose amplification applications requiring dual-channel configurations.
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 | 1 | mA |
| Current - Output / Channel | 40 | mA |
| Voltage - Supply Span (Min) | 3 | V |
| Voltage - Supply Span (Max) | 32 | 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 LM2904M is determined by the following critical parameters:
Primary Substitution Criteria:
- Amplifier Type: General Purpose
- Number of Circuits: 2
- Package / Case: 8-SOIC (0.154", 3.90mm Width)
- Mounting Type: Surface Mount
- Voltage - Supply Span: Minimum 3V, Maximum ≥32V
- Operating Temperature Range: Minimum -40°C, Maximum ≥85°C
- Current - Output / Channel: Minimum 40 mA
Secondary Compatibility Parameters:
- Gain Bandwidth Product: 1 MHz (nominal reference)
- Current - Input Bias: 45 nA (nominal reference)
- Voltage - Input Offset: 2 mV (nominal reference)
Substitute parts are grouped into two categories:
Category 1: Direct Equivalents (Identical Specifications) Parts that maintain all primary substitution criteria with identical or superior electrical performance characteristics and active product status.
Category 2: Functional Alternatives (Modified Specifications) Parts that satisfy primary substitution criteria but feature different amplifier types, output configurations, or electrical performance parameters. These require application-level verification of compatibility.
Parameter Comparison
| Part Number | Manufacturer | Amplifier Type | GBW (MHz) | Input Bias (nA) | Input Offset (mV) | Supply Current (mA) | Output Current (mA) | Supply Min (V) | Supply Max (V) | Temp Range (°C) | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| LM2904M | Texas Instruments | General Purpose | 1 | 45 | 2 | 1 | 40 | 3 | 32 | -40 to 85 | Obsolete | Non-compliant |
| LM2904M/NOPB | Texas Instruments | General Purpose | 1 | 45 | 2 | 1 | 40 | 3 | 32 | -40 to 85 | Active | ROHS3 Compliant |
| LM2904AYDT | STMicroelectronics | General Purpose | 1.1 | 20 | 1 | 0.7 | 40 | 3 | 30 | -40 to 125 | Active | ROHS3 Compliant |
| LM2904DR2G | onsemi | General Purpose | 1 | 45 | 2 | 0.8 | 40 | 3 | 26 | -40 to 85 | Active | ROHS3 Compliant |
| LM258WYDT | STMicroelectronics | General Purpose | 1.1 | 20 | 2 | 0.7 | 60 | 3 | 30 | -40 to 105 | Active | ROHS3 Compliant |
| LM258YDT | STMicroelectronics | General Purpose | 1.1 | 20 | 5 | 0.7 | 40 | 3 | 30 | -40 to 105 | Obsolete | ROHS3 Compliant |
| LM2904DT | Rohm Semiconductor | General Purpose | 0.7 | 20 | 1 | 0.6 | 30 | 3 | 32 | -40 to 125 | Not For New Designs | ROHS3 Compliant |
| LM2904DR | Rohm Semiconductor | General Purpose | 0.7 | 20 | 3 | 1 | 40 | 3 | 26 | -40 to 125 | Not For New Designs | ROHS3 Compliant |
| BA2904F-E2 | Rohm Semiconductor | General Purpose | 0.5 | 20 | 2 | 0.5 | 30 | 3 | 32 | -40 to 125 | Active | ROHS3 Compliant |
| BA3404F-E2 | Rohm Semiconductor | General Purpose | 1.2 | 70 | 2 | 2 | 30 | 4 | 36 | -40 to 85 | Active | ROHS3 Compliant |
| ADA4062-2ARZ | Analog Devices Inc. | J-FET | 1.4 | 0.002 | 0.75 | 0.165 | 20 | 8 | 36 | -40 to 125 | Active | ROHS3 Compliant |
Engineering Selection Recommendations
Tier 1: Recommended Direct Substitutes (Active Status, Full Compliance)
LM2904M/NOPB (Texas Instruments) is the primary recommended substitute. This part maintains identical electrical specifications to the LM2904M while offering active product status and ROHS3 compliance. The packaging and performance characteristics are fully compatible with existing designs. Inventory availability is substantial at 5,000,200 units.
LM2904AYDT (STMicroelectronics) provides an active alternative with enhanced operating temperature range (-40°C to 125°C) and improved input bias current (20 nA versus 45 nA). Supply voltage maximum is reduced to 30V, which is acceptable for most applications requiring 32V operation. This part carries AEC-Q100 automotive qualification and ROHS3 compliance.
LM2904DR2G (onsemi) maintains the original gain bandwidth product of 1 MHz and input bias current of 45 nA. Supply voltage maximum is limited to 26V, which restricts use in applications requiring the full 32V range. Product status is active with ROHS3 compliance and substantial inventory (505,300 units).
Tier 2: Functional Alternatives (Active Status, Modified Specifications)
LM258WYDT (STMicroelectronics) offers enhanced output current capability (60 mA versus 40 mA) and extended operating temperature range (-40°C to 105°C). Supply voltage maximum is 30V. This part includes AEC-Q100 automotive qualification and ROHS3 compliance.
BA2904F-E2 (Rohm Semiconductor) provides reduced gain bandwidth product (500 kHz) and lower supply current (500 µA). Package width is increased to 4.40mm. This part is active with ROHS3 compliance.
BA3404F-E2 (Rohm Semiconductor) features push-pull output configuration and extended supply voltage range (4V to 36V). Input bias current is elevated to 70 nA. This part is active with ROHS3 compliance.
Tier 3: Legacy Alternatives (Not Recommended for New Designs)
LM258YDT (STMicroelectronics) is classified as obsolete. Input offset voltage is elevated to 5 mV. This part should not be selected for new designs.
LM2904DT and LM2904DR (Rohm Semiconductor) are classified as "Not For New Designs." These parts feature reduced gain bandwidth product (700 kHz) and lower output current capability (30 mA). Selection should be limited to legacy system maintenance.
Tier 4: Specialized Alternative (Different Amplifier Type)
ADA4062-2ARZ (Analog Devices Inc.) is a J-FET amplifier with fundamentally different input characteristics (2 pA input bias current versus 45 nA). Supply voltage minimum is 8V, which restricts use in 3V to 8V applications. This part is suitable only for applications where J-FET input characteristics provide specific advantages.
Frequently Asked Questions (FAQ)
Q1: Can LM2904M/NOPB be used as a direct replacement for LM2904M?
A: Yes. LM2904M/NOPB is the active equivalent of LM2904M with identical electrical specifications. The primary difference is product status (active versus obsolete) and RoHS compliance (ROHS3 compliant versus non-compliant). Packaging, pinout, and performance are fully compatible.
Q2: What is the primary limitation of LM2904DR2G compared to LM2904M?
A: The maximum supply voltage is reduced from 32V to 26V. Applications requiring operation above 26V cannot use this substitute. All other electrical parameters are compatible.
Q3: Why is ADA4062-2ARZ listed as a substitute if it has different input bias current?
A: ADA4062-2ARZ is a J-FET amplifier with fundamentally different input characteristics (2 pA versus 45 nA). It is included as a functional alternative for applications where extremely low input bias current provides specific advantages. However, it requires minimum 8V supply voltage and is not suitable for 3V to 8V applications.
Q4: Can LM258WYDT replace LM2904M in all applications?
A: LM258WYDT is functionally compatible for most applications. Key differences are: (1) supply voltage maximum reduced to 30V, (2) supply current reduced to 700 µA, and (3) output current increased to 60 mA. Applications requiring 32V operation or lower supply current must verify compatibility.
Q5: What is the significance of the 8-SOIC package width difference between 3.90mm and 4.40mm?
A: The 8-SOIC package with 3.90mm width (LM2904M standard) and 8-SOP with 4.40mm width (BA2904F-E2) are mechanically different. PCB footprints are not interchangeable. Physical board layout verification is required before substitution.
Q6: Are LM2904DT and LM2904DR suitable for new designs?
A: No. Both parts are classified as "Not For New Designs." These parts feature reduced gain bandwidth product (700 kHz) and lower output current (30 mA). Selection should be limited to legacy system maintenance and repair only.
Q7: What is the advantage of LM2904AYDT over LM2904M/NOPB?
A: LM2904AYDT offers extended operating temperature range (-40°C to 125°C versus -40°C to 85°C) and improved input bias current (20 nA versus 45 nA). Supply voltage maximum is reduced to 30V. This part includes AEC-Q100 automotive qualification.
Q8: Can BA3404F-E2 be used in place of LM2904M?
A: BA3404F-E2 is functionally compatible with key differences: (1) push-pull output configuration, (2) extended supply voltage range (4V to 36V), (3) elevated input bias current (70 nA), and (4) increased supply current (2 mA). Application-level verification is required.
Q9: What is the primary reason LM2904M is classified as obsolete?
A: The LM2904M is obsolete due to product lifecycle management by Texas Instruments. The active equivalent LM2904M/NOPB is available with identical specifications and improved RoHS compliance.
Q10: Which substitute offers the best inventory availability?
A: LM2904DR2G (onsemi) offers the highest inventory at 505,300 units. LM2904M/NOPB (Texas Instruments) provides 5,000,200 units. Both parts are readily available for procurement.
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