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LM2901DG Equivalent & Substitute Parts
Part Overview
The LM2901DG is a general-purpose quad comparator IC manufactured by onsemi in 14-SOIC surface-mount packaging. This device integrates four independent voltage comparators with CMOS, open-collector, and TTL output configurations, designed for analog signal comparison applications across industrial and commercial temperature ranges (-40°C to 105°C).
The LM2901DG is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications currently utilizing this component.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Part Number | LM2901DG |
| Category | Linear - Comparator |
| Type | General Purpose |
| Number of Elements | 4 |
| Output Type | CMOS, Open-Collector, TTL |
| Package / Case | 14-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| Voltage - Supply, Single/Dual (±) | 3V ~ 36V, ±1.5V ~ 18V |
| Voltage - Input Offset (Max) | 7mV @ 5V |
| Current - Input Bias (Max) | 0.25µA @ 5V |
| Current - Output (Typ) | 16mA @ 5V |
| Current - Quiescent (Max) | 2.5mA |
| Operating Temperature | -40°C ~ 105°C |
| Product Status | Obsolete |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitute parts for the LM2901DG are classified into two categories based on electrical and mechanical compatibility:
Direct Substitutes share identical base product architecture (LM2901 series) with compatible electrical specifications and package form factors. These parts maintain full functional equivalence with the original device.
Similar Substitutes provide equivalent functional performance as quad general-purpose comparators with compatible output types, supply voltage ranges, and 14-pin surface-mount packaging. These parts may differ in specific electrical characteristics (input offset voltage, quiescent current) or operating temperature ranges but remain suitable for applications where the LM2901DG was originally specified.
Key Parameters Determining Substitution:
- Number of Elements: 4 comparators
- Output Type: Open-Collector configuration (primary requirement)
- Package: 14-SOIC surface-mount form factor
- Supply Voltage Range: Minimum 2V ~ 36V single supply or ±1V ~ 18V dual supply
- Input Offset Voltage: Maximum 7mV @ 5V
- Current - Output (Typ): 16mA @ 5V
- Mounting Type: Surface Mount
Parameter Comparison
| Parameter | LM2901DG (onsemi) | LM2901D (STMicroelectronics) | LM2901DT (STMicroelectronics) | AS339AMTR-E1 (Diodes) | AS339MTR-E1 (Diodes) | AS339MTR-G1 (Diodes) | BA2901SF-E2 (Rohm) | BA2901YF-MGE2 (Rohm) | CMP04FSZ (Analog Devices) | LM139AJ/PB (Texas Instruments) |
|---|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | onsemi | STMicroelectronics | STMicroelectronics | Diodes Inc. | Diodes Inc. | Diodes Inc. | Rohm | Rohm | Analog Devices | Texas Instruments |
| Number of Elements | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
| Output Type | CMOS, Open-Collector, TTL | CMOS, DTL, ECL, MOS, Open-Collector, TTL | CMOS, DTL, ECL, MOS, Open-Collector, TTL | Open-Collector | Open-Collector | Open-Collector | Open-Collector | Open-Collector | CMOS, DTL, ECL, MOS, Open-Collector, TTL | Open-Collector, Open-Drain |
| Package / Case | 14-SOIC (0.154", 3.90mm) | 14-SOIC (0.154", 3.90mm) | 14-SOIC (0.154", 3.90mm) | 14-SOIC (0.154", 3.90mm) | 14-SOIC (0.154", 3.90mm) | 14-SOIC (0.154", 3.90mm) | 14-SOIC (0.173", 4.40mm) | 14-SOIC (0.173", 4.40mm) | 14-SOIC (0.154", 3.90mm) | 14-CDIP (0.300", 7.62mm) |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Through Hole |
| Voltage - Supply, Single/Dual (±) | 3V ~ 36V, ±1.5V ~ 18V | 2V ~ 32V, ±1V ~ 16V | 2V ~ 32V, ±1V ~ 16V | 2V ~ 36V, ±1V ~ 18V | 2V ~ 36V, ±1V ~ 18V | 2V ~ 36V, ±1V ~ 18V | 2V ~ 36V, ±1V ~ 18V | 2V ~ 36V, ±1V ~ 18V | 3.3V ~ 36V, ±1.65V ~ 18V | 2V ~ 36V, ±1V ~ 18V |
| Voltage - Input Offset (Max) | 7mV @ 5V | 7mV @ 5V | 7mV @ 5V | 3mV @ 5V | 5mV @ 5V | 5mV @ 5V | 7mV @ 5V | 7mV @ 5V | 1mV @ 5V | 2mV @ 30V |
| Current - Input Bias (Max) | 0.25µA @ 5V | 0.25µA @ 5V | 0.25µA @ 5V | 0.25µA @ 5V | 0.25µA @ 5V | 0.25µA @ 5V | 0.25µA @ 5V | 0.05µA @ 5V | 0.1µA @ 5V | 0.1µA @ 5V |
| Current - Output (Typ) | 16mA @ 5V | 16mA @ 5V | 16mA @ 5V | 16mA @ 5V | 16mA @ 5V | 16mA | 16mA @ 5V | 16mA @ 5V | 16mA @ 5V | 16mA @ 5V |
| Current - Quiescent (Max) | 2.5mA | 2.5mA | 2.5mA | 2mA | 2mA | 2mA | 2mA | 1mA | 3mA | 2.5mA |
| Operating Temperature | -40°C ~ 105°C | -40°C ~ 125°C | -40°C ~ 125°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 105°C | -40°C ~ 125°C | -40°C ~ 85°C | -55°C ~ 125°C |
| Product Status | Obsolete | Active | Active | Active | Active | Active | Active | Active | Active | Active |
| RoHS Status | Not specified | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 3 (168 Hours) | 3 (168 Hours) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
Engineering Selection Recommendations
Direct Substitutes (Highest Compatibility):
LM2901D and LM2901DT (STMicroelectronics) are direct substitutes for the LM2901DG. Both parts maintain the LM2901 base product architecture with identical pin configuration and functional equivalence. STMicroelectronics parts are currently in active production status with ROHS3 compliance. The LM2901DT variant offers extended availability in cut-tape and digi-reel packaging formats. Operating temperature range extends to 125°C, providing enhanced thermal margin compared to the original specification.
Similar Substitutes (Functional Equivalence):
AS339AMTR-E1, AS339MTR-E1, and AS339MTR-G1 (Diodes Incorporated) provide quad open-collector comparators in 14-SOIC surface-mount packaging with compatible supply voltage ranges. These parts are active production devices with ROHS3 compliance. Input offset voltage specifications are superior (3mV to 5mV) compared to the LM2901DG (7mV). Operating temperature range is limited to -40°C to 85°C. Moisture sensitivity levels vary; AS339AMTR-E1 maintains MSL 1, while AS339MTR-E1 and AS339MTR-G1 are rated MSL 3.
BA2901SF-E2 and BA2901YF-MGE2 (Rohm Semiconductor) are quad open-collector comparators with compatible electrical specifications. BA2901SF-E2 maintains operating temperature range of -40°C to 105°C matching the original device. BA2901YF-MGE2 extends to -40°C to 125°C and includes AEC-Q100 automotive qualification. Package width is 4.40mm (0.173") compared to 3.90mm (0.154") for the LM2901DG; PCB layout verification is required.
CMP04FSZ (Analog Devices Inc.) is a quad comparator with superior input offset voltage specification (1mV @ 5V) and extended CMRR/PSRR performance (100dB). Operating temperature range is limited to -40°C to 85°C. This device is suitable for applications requiring enhanced precision.
LM139AJ/PB (Texas Instruments) is a quad open-collector comparator in 14-CDIP through-hole packaging. This part is not a direct surface-mount replacement due to package type difference. It is suitable only for applications where through-hole mounting is acceptable. Operating temperature range extends to -55°C to 125°C.
Frequently Asked Questions (FAQ)
Q: Can LM2901D or LM2901DT directly replace the LM2901DG without PCB modifications?
A: Yes. LM2901D and LM2901DT are direct substitutes with identical pin configuration, package footprint (14-SOIC, 0.154" width), and functional specifications. No PCB layout changes are required.
Q: What is the primary difference between AS339 variants and the LM2901DG?
A: AS339 parts are functionally equivalent quad comparators with superior input offset voltage (3mV to 5mV versus 7mV). The primary limitation is operating temperature range (-40°C to 85°C versus -40°C to 105°C). Moisture sensitivity levels vary by variant. PCB layout compatibility is maintained due to identical 14-SOIC package dimensions.
Q: Are Rohm BA2901 parts compatible with the LM2901DG?
A: BA2901SF-E2 and BA2901YF-MGE2 are functionally compatible quad comparators. BA2901SF-E2 maintains the -40°C to 105°C operating temperature range. However, package width differs (4.40mm versus 3.90mm). PCB layout verification is required to confirm footprint compatibility before implementation.
Q: Why is LM139AJ/PB listed as a substitute if it uses through-hole packaging?
A: LM139AJ/PB provides functional equivalence as a quad open-collector comparator with extended operating temperature range (-55°C to 125°C). It is listed for applications where through-hole mounting is acceptable or where existing PCB designs already accommodate this package type. It is not suitable for surface-mount applications.
Q: What compliance certifications should I verify when selecting a substitute?
A: All listed active-production substitutes maintain ROHS3 compliance. Moisture sensitivity level (MSL) should be verified against assembly process requirements. BA2901YF-MGE2 includes AEC-Q100 automotive qualification for applications requiring automotive-grade components.
Q: How do I determine if a substitute part is suitable for my application?
A: Verify the following parameters match or exceed your design requirements: (1) supply voltage range compatibility, (2) input offset voltage specification, (3) output current capability, (4) operating temperature range, (5) package form factor and mounting type, (6) output type (open-collector configuration), and (7) compliance certifications (RoHS, MSL).
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