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LM2901DG4 Equivalent & Substitute Parts
Part Overview
The LM2901DG4 is a general-purpose comparator IC manufactured by Texas Instruments, featuring four independent comparators in a 14-SOIC surface-mount package. This device operates across a wide supply voltage range (2V to 30V single supply, ±1V to ±15V dual supply) and is designed for open-collector output applications. The part is currently in Last Time Buy status, making equivalent and substitute parts essential for ongoing design support and production continuity.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | LM2901DG4 |
| Manufacturer | Texas Instruments |
| Number of Elements | 4 |
| Output Type | Open-Collector |
| Voltage Supply Range (Single) | 2V ~ 30V |
| Voltage Supply Range (Dual) | ±1V ~ ±15V |
| Input Offset Voltage (Max) | 7mV @ 30V |
| Input Bias Current (Max) | 0.25µA @ 5V |
| Output Current (Typ) | 20mA |
| Quiescent Current (Max) | 2.5mA |
| Operating Temperature | -40°C ~ 125°C |
| Package / Case | 14-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 LM2901DG4 is determined by the following critical parameters:
Electrical Compatibility Requirements:
- Number of comparator elements: 4
- Output type: Open-Collector (primary requirement)
- Supply voltage range: Minimum 2V ~ 30V single supply or ±1V ~ ±15V dual supply
- Input offset voltage: Maximum 7mV
- Input bias current: Maximum 0.25µA
- Output current capability: Minimum 16mA typical
- Quiescent current: Maximum 2.5mA
- Operating temperature range: Minimum -40°C ~ 125°C
Mechanical Compatibility Requirements:
- Package type: 14-SOIC surface-mount
- Package width: 0.154" (3.90mm)
- Mounting type: Surface Mount
Regulatory Compliance:
- RoHS3 compliance required
- MSL rating: 1 (Unlimited)
Substitute parts must satisfy all electrical parameters within the specified tolerances and maintain identical or superior performance characteristics. Package footprint compatibility is mandatory for direct PCB replacement.
Parameter Comparison
| Part Number | Manufacturer | Product Status | Supply Voltage (Single) | Supply Voltage (Dual) | Input Offset (Max) | Input Bias (Max) | Output Current (Typ) | Quiescent (Max) | Temp Range | Package |
|---|---|---|---|---|---|---|---|---|---|---|
| LM2901DG4 | Texas Instruments | Last Time Buy | 2V ~ 30V | ±1V ~ ±15V | 7mV @ 30V | 0.25µA @ 5V | 20mA | 2.5mA | -40°C ~ 125°C | 14-SOIC |
| LM2901D | STMicroelectronics | Active | 2V ~ 32V | ±1V ~ ±16V | 7mV @ 5V | 0.25µA @ 5V | 16mA @ 5V | 2.5mA | -40°C ~ 125°C | 14-SOIC |
| LM2901DR | Rohm Semiconductor | Obsolete | 2V ~ 36V | ±1V ~ ±18V | 7mV @ 5V | 0.25µA @ 5V | 16nA @ 5V | 2mA | -40°C ~ 125°C | 14-SOIC |
| LM139AD | Texas Instruments | Last Time Buy | 2V ~ 30V | ±1V ~ ±15V | 2mV @ 30V | 0.1µA @ 5V | 20mA | 2mA | -55°C ~ 125°C | 14-SOIC |
| LM2901M/NOPB | Texas Instruments | Active | 2V ~ 36V | ±1V ~ ±18V | 7mV @ 30V | 0.25µA @ 5V | 16mA @ 5V | 2.5mA | -40°C ~ 85°C | 14-SOIC |
| LM2901MX/NOPB | Texas Instruments | Active | 2V ~ 36V | ±1V ~ ±18V | 7mV @ 30V | 0.25µA @ 5V | 16mA @ 5V | 2.5mA | -40°C ~ 85°C | 14-SOIC |
| BA2901SF-E2 | Rohm Semiconductor | Active | 2V ~ 36V | ±1V ~ ±18V | 7mV @ 5V | 0.25µA @ 5V | 16mA @ 5V | 2mA | -40°C ~ 105°C | 14-SOP |
| LM139ADT | STMicroelectronics | Active | 2V ~ 32V | ±1V ~ ±16V | 2mV @ 30V | 0.1µA @ 5V | 16mA @ 5V | 2mA | -55°C ~ 125°C | 14-SOIC |
| LM139DT | STMicroelectronics | Active | 2V ~ 32V | ±1V ~ ±16V | 5mV @ 30V | 0.25µA @ 5V | 16mA @ 5V | 2mA | -55°C ~ 125°C | 14-SOIC |
| LM239ADT | STMicroelectronics | Active | 2V ~ 32V | ±1V ~ ±16V | 2mV @ 30V | 0.1µA @ 5V | 16mA @ 5V | 2mA | -40°C ~ 105°C | 14-SOIC |
| LM239DT | STMicroelectronics | Active | 2V ~ 32V | ±1V ~ ±16V | 5mV @ 30V | 0.25µA @ 5V | 16mA @ 5V | 2mA | -40°C ~ 105°C | 14-SOIC |
Engineering Selection Recommendations
Primary Substitutes (Active Status, Full Compatibility):
LM2901D (STMicroelectronics) and LM2901MX/NOPB (Texas Instruments) are the preferred substitutes. Both maintain active product status, meet all electrical specifications, and provide extended supply voltage ranges. LM2901MX/NOPB offers the advantage of remaining within the Texas Instruments product family with 26,730 units in stock.
Secondary Substitutes (Active Status, Extended Temperature Range):
LM139ADT and LM239ADT (STMicroelectronics) provide superior input offset voltage (2mV maximum) and extended operating temperature range (-55°C to 125°C). These parts are suitable for applications requiring tighter input specifications and broader temperature operation. LM239DT offers similar performance with slightly relaxed input offset voltage (5mV maximum) and maintains active status with 47,600 units available.
Alternative Consideration (Active Status, Package Variant):
BA2901SF-E2 (Rohm Semiconductor) is functionally equivalent with extended supply voltage range (2V ~ 36V) but uses a 14-SOP package (0.173" width) instead of 14-SOIC (0.154" width). This part requires PCB layout modification and is suitable only when package footprint constraints permit.
Avoid:
LM2901DR (Rohm Semiconductor) is obsolete and should not be selected for new designs despite high inventory availability.
Frequently Asked Questions (FAQ)
Q: Can LM2901MX/NOPB directly replace LM2901DG4 on existing PCBs?
A: Yes. Both parts use identical 14-SOIC packaging (0.154" width) and surface-mount footprint. Electrical specifications are compatible within design tolerances. The primary difference is packaging format (Cut Tape & Digi-Reel vs. Tube) and slightly extended operating temperature range (-40°C to 85°C vs. -40°C to 125°C).
Q: What is the difference between LM2901 and LM139 series comparators?
A: The LM139 series features superior input offset voltage (2mV maximum vs. 7mV) and lower input bias current (0.1µA vs. 0.25µA). Both maintain four-element comparator architecture and open-collector output. LM139 variants are suitable for applications requiring tighter input specifications.
Q: Is BA2901SF-E2 a direct replacement?
A: BA2901SF-E2 is electrically equivalent but uses a 14-SOP package with 0.173" width compared to the 14-SOIC 0.154" width of LM2901DG4. PCB footprint modification is required. This part is suitable only when layout constraints permit package substitution.
Q: Why is LM2901DR listed as obsolete?
A: LM2901DR (Rohm Semiconductor) has been discontinued and is no longer recommended for new designs. Although inventory remains available, active alternatives with ongoing manufacturer support should be prioritized.
Q: What supply voltage range should I verify for my application?
A: Confirm your circuit operates within the specified single-supply range (2V minimum to 30V maximum for LM2901DG4) or dual-supply range (±1V to ±15V). Substitute parts offer extended ranges up to 2V ~ 36V or ±1V ~ ±18V, which are backward-compatible with the original specification.
Q: Are all listed substitutes RoHS3 compliant?
A: Yes. All substitute parts listed maintain ROHS3 compliance and MSL rating of 1 (Unlimited), matching the environmental and regulatory requirements of the original LM2901DG4.
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