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LM2904DR2G Equivalent & Substitute Parts
Part Overview
The LM2904DR2G is a general-purpose operational amplifier featuring two independent circuits in an 8-SOIC surface mount package, manufactured by onsemi. This device is actively produced and widely used in analog signal processing applications requiring dual-channel amplification with low input bias current and moderate bandwidth characteristics. The part is RoHS3 compliant with unlimited moisture sensitivity rating.
Substitute parts are necessary when the primary part experiences supply constraints, when alternative manufacturers offer improved specifications, or when design requirements necessitate enhanced performance characteristics such as higher slew rate, lower input bias current, or extended temperature operating ranges.
Substiute Parts
Key Parameters
| Parameter | LM2904DR2G (onsemi) | Unit |
|---|---|---|
| Amplifier Type | General Purpose | — |
| Number of Circuits | 2 | — |
| Gain Bandwidth Product | 1 MHz | MHz |
| Current - Input Bias | 45 nA | nA |
| Voltage - Input Offset | 2 mV | mV |
| Current - Supply | 800 µA (x2 Channels) | µA |
| Current - Output / Channel | 40 mA | mA |
| Voltage - Supply Span (Min) | 3 V | V |
| Voltage - Supply Span (Max) | 26 V | V |
| Operating Temperature | -40°C ~ 85°C | °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 logic for the LM2904DR2G is based on the following critical parameters that must be maintained or improved:
Mandatory Compatibility Criteria:
- Number of circuits: 2 independent amplifier channels
- Package type: 8-SOIC surface mount with 0.154" (3.90mm) width
- Amplifier classification: General Purpose or equivalent performance class
- Supply voltage range: Minimum 3V to maximum 26V or greater
- Output current per channel: 40 mA or greater
- Input offset voltage: 2 mV or lower
- Operating temperature: -40°C minimum to 85°C minimum
- RoHS3 compliance and MSL 1 rating
Direct Substitutes maintain all critical parameters within the same performance envelope and package specification. These parts are pin-compatible and functionally equivalent.
Similar Substitutes share the same package and circuit count but may have different amplifier types (CMOS, J-FET) or modified electrical characteristics. These require design verification for specific application requirements.
Parameter Comparison
| Part Number | Manufacturer | Amplifier Type | GBW (MHz) | Input Bias (nA) | Input Offset (mV) | Supply Current (µA) | Output Current (mA) | Temp Range (°C) | Product Status |
|---|---|---|---|---|---|---|---|---|---|
| LM2904DR2G | onsemi | General Purpose | 1 | 45 | 2 | 800 | 40 | -40 ~ 85 | Active |
| LM2904D | STMicroelectronics | General Purpose | 0.7 | 20 | 2 | 700 | 40 | -40 ~ 125 | Active |
| LM2904DR | Rohm Semiconductor | General Purpose | 0.7 | 20 | 3 | 1000 | 40 | -40 ~ 125 | Not For New Designs |
| LM2904DT | Rohm Semiconductor | General Purpose | 0.7 | 20 | 1 | 600 | 30 | -40 ~ 125 | Not For New Designs |
| ADA4062-2ARZ | Analog Devices Inc. | J-FET | 1.4 | 0.002 | 0.75 | 165 | 20 | -40 ~ 125 | Active |
| BA10358F-E2 | Rohm Semiconductor | General Purpose | 0.5 | 45 | 2 | 700 | 20 | -40 ~ 85 | Active |
| BA2904F-E2 | Rohm Semiconductor | General Purpose | 0.5 | 20 | 2 | 500 | 30 | -40 ~ 125 | Active |
| BA2904YF-MGE2 | Rohm Semiconductor | General Purpose | 0.5 | 20 | 2 | 500 | 30 | -40 ~ 125 | Active |
| ICL7621BCSA+ | Analog Devices Inc./Maxim Integrated | CMOS | 1.4 | 0.001 | 5 | 1000 | — | 0 ~ 70 | Active |
Engineering Selection Recommendations
Direct Substitutes (Pin-Compatible, Functionally Equivalent):
The LM2904D (STMicroelectronics) qualifies as a direct substitute. It maintains the 8-SOIC package, dual-circuit configuration, and meets all critical electrical parameters. The LM2904D offers improved input bias current (20 nA versus 45 nA) and extended operating temperature range (-40°C to 125°C). Product status is Active, ensuring long-term availability and supply continuity.
The LM2904DR (Rohm Semiconductor) is functionally compatible but carries a "Not For New Designs" status. While it meets package and circuit requirements, this designation indicates the manufacturer is phasing out production. Use only for legacy system maintenance or when supply of active alternatives is unavailable.
The LM2904DT (Rohm Semiconductor) is compatible in package and circuit count but exhibits reduced output current per channel (30 mA versus 40 mA) and carries "Not For New Designs" status. Selection requires verification that 30 mA output current satisfies application requirements.
Similar Substitutes (Different Amplifier Type or Package Variant):
The ADA4062-2ARZ (Analog Devices Inc.) is a J-FET input amplifier offering superior input bias current (2 pA) and higher slew rate (3.3 V/µs). However, it requires minimum 8V supply voltage and has reduced output current (20 mA). Use when ultra-low input bias current is critical and supply voltage constraints permit.
The BA2904F-E2 and BA2904YF-MGE2 (Rohm Semiconductor) are general-purpose alternatives with different package dimensions (0.173" width versus 0.154"). Both are Active products with extended temperature range. The BA2904YF-MGE2 includes AEC-Q100 automotive qualification. These require PCB layout verification due to package width difference.
The ICL7621BCSA+ (Analog Devices Inc./Maxim Integrated) is a CMOS rail-to-rail amplifier with extremely low input bias current (1 pA) but operates only to 70°C maximum and requires 2V minimum supply. Use only when operating temperature range permits and ultra-low input bias is essential.
Compliance and Certification:
All recommended substitutes maintain RoHS3 compliance and MSL 1 rating. The BA2904YF-MGE2 includes AEC-Q100 automotive qualification for applications requiring automotive-grade components.
Frequently Asked Questions (FAQ)
Q: Can LM2904D replace LM2904DR2G directly?
A: Yes. The LM2904D (STMicroelectronics) is a direct pin-compatible substitute. Both use 8-SOIC packaging with 0.154" width, contain two independent general-purpose amplifier circuits, and meet all critical electrical specifications. The LM2904D offers improved input bias current and extended temperature range. No circuit modifications are required.
Q: Why is LM2904DR marked "Not For New Designs"?
A: The "Not For New Designs" status indicates the manufacturer (Rohm Semiconductor) is discontinuing production. While the part remains functionally compatible, new designs should specify active alternatives such as LM2904D or BA2904F-E2 to ensure long-term supply availability and avoid future obsolescence.
Q: What is the difference between 8-SOIC and 8-SOP packages?
A: Both are 8-pin surface mount packages with similar footprints. The primary difference is package width: 8-SOIC is 0.154" (3.90mm) while 8-SOP variants may be 0.173" (4.40mm). Parts with different widths require PCB layout verification before substitution. Pin pitch and electrical characteristics remain compatible.
Q: Can I use ADA4062-2ARZ as a substitute?
A: The ADA4062-2ARZ is functionally compatible but requires design verification. It is a J-FET input amplifier with superior input bias current (2 pA) and higher slew rate (3.3 V/µs), but has reduced output current (20 mA versus 40 mA) and requires minimum 8V supply voltage. Use only when application requirements permit these trade-offs.
Q: Does package width affect PCB compatibility?
A: Yes. The LM2904DR2G uses 8-SOIC with 0.154" (3.90mm) width. Substitutes like BA10358F-E2 and BA2904F-E2 use 8-SOP with 0.173" (4.40mm) width. Verify PCB footprint and layout clearances before substitution. Pin pitch remains standard, but wider packages may conflict with adjacent components.
Q: What is the minimum supply voltage requirement?
A: The LM2904DR2G operates from 3V minimum. Most direct substitutes (LM2904D, LM2904DR, LM2904DT) maintain this 3V minimum. The ADA4062-2ARZ requires 8V minimum, and ICL7621BCSA+ requires 2V minimum. Verify supply voltage availability in your application before selecting alternatives.
Q: Are all substitutes RoHS3 compliant?
A: Yes. All parts listed maintain RoHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the LM2904DR2G specifications. This ensures compatibility with modern manufacturing and environmental regulations.
Q: Which substitute offers the best performance improvement?
A: The ADA4062-2ARZ offers the most significant performance enhancement with 1.4 MHz bandwidth (versus 1 MHz), 3.3 V/µs slew rate (versus unspecified), and 2 pA input bias current (versus 45 nA). However, it requires 8V minimum supply and provides only 20 mA output current. The LM2904D offers more modest improvements (20 nA input bias, extended temperature range) while maintaining full compatibility.
Q: Can I substitute based on package alone?
A: No. Package compatibility is necessary but not sufficient. Electrical parameters including supply voltage range, output current, input bias current, and operating temperature must also be verified. Always compare the complete parameter set before substitution.
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