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LM2901DRE4 Equivalent & Substitute Parts
Part Overview
The LM2901DRE4 is a general-purpose quad comparator IC manufactured by Texas Instruments, housed in a 14-SOIC surface-mount package. This device features open-collector outputs and operates across a wide supply voltage range of 2V to 30V (single supply) or ±1V to ±15V (dual supply). The LM2901DRE4 is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | LM2901DRE4 |
| Manufacturer | Texas Instruments |
| Category | Linear Comparator |
| Package / Case | 14-SOIC (0.154", 3.90mm Width) |
| Number of Elements | 4 |
| Output Type | Open-Collector |
| Voltage - Supply, Single/Dual (±) | 2V ~ 30V, ±1V ~ 15V |
| Voltage - Input Offset (Max) | 7mV @ 30V |
| Current - Input Bias (Max) | 0.25µA @ 5V |
| Current - Output (Typ) | 20mA |
| Current - Quiescent (Max) | 2.5mA |
| Operating Temperature | -40°C ~ 125°C |
| Mounting Type | Surface Mount |
| Product Status | Obsolete |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution of the LM2901DRE4 is determined by the following critical parameters:
Electrical Compatibility Requirements:
- Number of elements: 4 comparators
- Output type: Open-Collector configuration
- Supply voltage range: Minimum 2V ~ 30V (single) or ±1V ~ 15V (dual)
- Input offset voltage: Maximum 7mV
- Input bias current: Maximum 0.25µA @ 5V
- 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
- REACH unaffected status
Substitute parts are grouped into two categories: MFR Recommended (direct manufacturer alternatives with identical or superior specifications) and Parametric Equivalents (parts meeting all electrical and mechanical requirements).
Parameter Comparison
| Part Number | Manufacturer | Product Status | Supply Voltage (Single/Dual) | Input Offset (Max) | Input Bias (Max) | Output Current (Typ) | Quiescent Current (Max) | Operating Temp | Package |
|---|---|---|---|---|---|---|---|---|---|
| LM2901DRE4 | Texas Instruments | Obsolete | 2V~30V, ±1V~15V | 7mV @ 30V | 0.25µA @ 5V | 20mA | 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 |
| LM2901DRG3 | Texas Instruments | Active | 2V~30V, ±1V~15V | 7mV @ 30V | 0.25µA @ 5V | 20mA | 2.5mA | -40°C ~ 125°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-SOIC |
| 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 Recommendation: LM2901DRG3
The LM2901DRG3 is the direct parametric equivalent to the LM2901DRE4. Both are manufactured by Texas Instruments and share identical electrical specifications: 2V~30V supply voltage range, 7mV input offset, 0.25µA input bias current, 20mA output current, and -40°C to 125°C operating temperature. The LM2901DRG3 is currently in active production status, ensuring long-term availability and supply chain continuity. Both parts are ROHS3 compliant and carry identical regulatory certifications.
Secondary Recommendations: LM2901M/NOPB and LM2901MX/NOPB
These Texas Instruments parts offer extended supply voltage capability (2V~36V, ±1V~18V) compared to the original specification. Both are active products with ROHS3 compliance. The trade-off is a reduced operating temperature range (-40°C to 85°C versus -40°C to 125°C). These parts are suitable for applications not requiring the full -40°C to 125°C temperature range.
Alternative Manufacturers:
LM139ADT and LM239ADT (STMicroelectronics) provide superior input offset voltage specifications (2mV maximum) and extended lower temperature operation (-55°C). These parts are active products with full ROHS3 compliance. BA2901SF-E2 (Rohm Semiconductor) offers extended supply voltage range and active production status.
All recommended substitutes maintain the 14-SOIC package format, open-collector output configuration, and quad-comparator architecture required for direct replacement.
Frequently Asked Questions (FAQ)
Q: Can LM2901M/NOPB replace LM2901DRE4 in all applications?
A: LM2901M/NOPB is electrically compatible for most applications. However, it operates only to 85°C maximum, compared to the original 125°C specification. Applications requiring the full temperature range must use LM2901DRG3 or LM139ADT instead.
Q: What is the difference between LM139 and LM2901 series comparators?
A: Both are quad comparators in 14-SOIC packages. LM139 variants feature superior input offset voltage (2mV maximum) and lower input bias current (0.1µA maximum) compared to LM2901 (7mV, 0.25µA). LM139 parts also support extended lower temperature operation (-55°C). Selection depends on precision requirements and temperature specifications.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All recommended substitute parts listed carry ROHS3 compliance certification and REACH unaffected status, matching the regulatory profile of the original LM2901DRE4.
Q: Does package width variation affect PCB compatibility?
A: The LM2901DRE4 specifies 14-SOIC with 0.154" (3.90mm) width. BA2901SF-E2 uses 14-SOP with 0.173" (4.40mm) width. While both are surface-mount 14-pin packages, the increased width may require PCB layout verification. All other recommended substitutes use standard 14-SOIC (0.154") format and are directly compatible.
Q: Which substitute offers the best long-term availability?
A: LM2901DRG3, LM2901M/NOPB, and LM2901MX/NOPB are all active Texas Instruments products with high inventory levels (6,097, 3,100, and 26,730 units respectively). These represent the most reliable long-term sourcing options.
Q: Can I use LM239DT as a direct replacement?
A: LM239DT is functionally compatible and offers superior specifications (2mV input offset, 0.25µA input bias, -40°C to 105°C operation). However, it is a different base product number (LM239 versus LM2901). Electrical compatibility is confirmed, but design documentation and part qualification may require updating.
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