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LM2903DRG4 Equivalent & Substitute Parts
Part Overview
The LM2903DRG4 is a general-purpose dual comparator IC manufactured by Texas Instruments, housed in an 8-SOIC surface-mount package. This device features open-collector, rail-to-rail output configuration and operates across a wide supply voltage range of 2V to 36V (single supply) or ±1V to ±18V (dual supply). The LM2903DRG4 is classified as obsolete, making identification of active equivalent and substitute parts essential for ongoing design support and procurement continuity.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | LM2903DRG4 |
| Manufacturer | Texas Instruments |
| Category | Linear |
| Type | General Purpose Comparator |
| Number of Elements | 2 |
| Output Type | Open-Collector, Rail-to-Rail |
| Voltage Supply (Single/Dual) | 2V ~ 36V, ±1V ~ 18V |
| 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 |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| Product Status | Obsolete |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the LM2903DRG4 is determined by the following critical parameters:
Electrical Compatibility Requirements:
- Dual comparator configuration (2 elements)
- Open-collector output type
- Supply voltage range: minimum 2V ~ 36V single supply or ±1V ~ 18V dual supply
- Input offset voltage: maximum 7mV
- Input bias current: maximum 0.25µA @ 5V
- Output current capability: minimum 16mA typical
- Quiescent current: maximum 2.5mA
Mechanical & Packaging Requirements:
- 8-SOIC package (0.154", 3.90mm width)
- Surface-mount configuration
- Pin-compatible footprint
Compliance Requirements:
- ROHS3 compliant
- MSL rating of 1 or 3 (168 hours)
Substitute parts are grouped into three categories based on manufacturer recommendation status and parametric alignment:
MFR Recommended Substitutes: Parts explicitly recommended by manufacturers as direct replacements, maintaining full electrical and mechanical compatibility.
Parametric Equivalents: Parts with identical or superior electrical specifications and matching package configuration, suitable for direct substitution in most applications.
Direct Substitutes: Parts from alternative manufacturers with equivalent performance characteristics and identical package specifications.
Parameter Comparison
| Part Number | Manufacturer | Product Status | Supply Voltage | Input Offset (Max) | Output Current (Typ) | Quiescent Current (Max) | Operating Temp | Package | MSL |
|---|---|---|---|---|---|---|---|---|---|
| LM2903DRG4 | Texas Instruments | Obsolete | 2V~36V, ±1V~18V | 7mV @ 30V | 20mA | 2.5mA | -40°C ~ 125°C | 8-SOIC | 1 |
| LM2903DR | UMW | Active | 2V~30V, ±1V~±15V | 5mV @ 5V | 16mA @ 5V | 2.5mA | 0°C ~ 70°C | 8-SOIC | 1 |
| LM2903M/NOPB | Texas Instruments | Active | 2V~36V, ±1V~18V | 7mV @ 30V | 16mA @ 5V | 2.5mA | -40°C ~ 85°C | 8-SOIC | 1 |
| LM2903MX/NOPB | Texas Instruments | Active | 2V~36V, ±1V~18V | 7mV @ 30V | 16mA @ 5V | 2.5mA | -40°C ~ 85°C | 8-SOIC | 1 |
| LM2903DRG3 | Texas Instruments | Active | 2V~36V, ±1V~18V | 7mV @ 30V | 20mA | 2.5mA | -40°C ~ 125°C | 8-SOIC | 1 |
| LM2903DT | STMicroelectronics | Active | 2V~36V, ±1V~18V | 7mV @ 5V | 16mA @ 5V | 2.5mA | -40°C ~ 125°C | 8-SOIC | 1 |
| AS393AMTR-E1 | Diodes Incorporated | Active | 2V~36V, ±1V~18V | 3mV @ 5V | 16mA @ 5V | 1mA | -40°C ~ 85°C | 8-SOIC | 1 |
| AS393AMTR-G1 | Diodes Incorporated | Active | 2V~36V, ±1V~18V | 3mV @ 1.4V | 16mA | 1mA | -40°C ~ 85°C | 8-SOIC | 1 |
| AS393MTR-E1 | Diodes Incorporated | Active | 2V~36V, ±1V~18V | 5mV @ 5V | 16mA @ 5V | 1mA | -40°C ~ 85°C | 8-SOIC | 3 |
Engineering Selection Recommendations
Primary Recommendation: LM2903DRG3 (Texas Instruments)
The LM2903DRG3 is the optimal substitute for the obsolete LM2903DRG4. Both parts are manufactured by Texas Instruments and share identical electrical specifications, including supply voltage range (2V~36V, ±1V~18V), input offset voltage (7mV @ 30V), output current (20mA), and operating temperature range (-40°C ~ 125°C). The LM2903DRG3 is currently active in production and maintains ROHS3 compliance with MSL rating of 1. This part provides direct functional and mechanical compatibility with no design modifications required.
Secondary Recommendation: LM2903DT (STMicroelectronics)
The LM2903DT from STMicroelectronics is a direct substitute offering equivalent electrical performance across the full supply voltage range (2V~36V, ±1V~18V) and extended operating temperature (-40°C ~ 125°C). This part maintains the same 8-SOIC package configuration and open-collector output type. The LM2903DT is actively produced and ROHS3 compliant, making it suitable for applications requiring extended temperature operation.
Alternative Recommendation: AS393MTR-E1 (Diodes Incorporated)
The AS393MTR-E1 provides equivalent functionality with improved input offset voltage specification (5mV @ 5V) and reduced quiescent current (1mA versus 2.5mA). This part operates across the same supply voltage range and temperature span (-40°C ~ 85°C). The AS393MTR-E1 is actively produced with ROHS3 compliance. Note that this part carries MSL rating of 3 (168 hours), requiring appropriate moisture control during storage and handling.
Conditional Recommendation: LM2903M/NOPB or LM2903MX/NOPB (Texas Instruments)
These Texas Instruments parts are suitable substitutes when operating temperature requirements do not exceed 85°C. Both maintain identical supply voltage specifications and input offset voltage characteristics. The LM2903M/NOPB is packaged in tube format, while the LM2903MX/NOPB is supplied in cut tape and digi-reel format. Both are ROHS3 compliant with MSL rating of 1.
Not Recommended: LM2903DR (UMW)
The LM2903DR from UMW has reduced maximum supply voltage (2V~30V versus 2V~36V) and narrower dual supply range (±1V~±15V versus ±1V~18V). Additionally, the operating temperature range is limited to 0°C ~ 70°C, which is significantly narrower than the original part. This part is suitable only for applications with relaxed temperature and voltage requirements.
Frequently Asked Questions (FAQ)
Q: Can I use LM2903M/NOPB as a direct replacement for LM2903DRG4?
A: The LM2903M/NOPB is electrically compatible but has a reduced operating temperature range (-40°C ~ 85°C versus -40°C ~ 125°C). Use this part only if your application does not require operation above 85°C. The packaging format (tube versus cut tape) may also affect procurement and assembly processes.
Q: What is the difference between LM2903DRG3 and LM2903DRG4?
A: Both parts share identical electrical specifications and package configuration. The primary difference is product status: LM2903DRG4 is obsolete while LM2903DRG3 is active in production. The LM2903DRG3 is the recommended replacement for the obsolete LM2903DRG4.
Q: Are AS393 series parts fully compatible with LM2903DRG4?
A: AS393 series parts (AS393AMTR-E1, AS393AMTR-G1, AS393MTR-E1) are functionally equivalent with identical package configuration and supply voltage range. However, they have reduced operating temperature range (-40°C ~ 85°C versus -40°C ~ 125°C) and lower quiescent current (1mA versus 2.5mA). These parts are suitable substitutes for applications not requiring operation above 85°C.
Q: Does MSL rating affect part selection?
A: MSL (Moisture Sensitivity Level) rating indicates moisture absorption characteristics during storage. Most recommended substitutes carry MSL rating of 1 (unlimited shelf life). The AS393MTR-E1 carries MSL rating of 3 (168 hours), requiring moisture control during storage and handling. Select MSL rating based on your supply chain and storage capabilities.
Q: Can I substitute LM2903DR (UMW) for LM2903DRG4?
A: The LM2903DR has reduced maximum supply voltage (30V versus 36V) and narrower operating temperature range (0°C ~ 70°C versus -40°C ~ 125°C). Use this part only if your application operates within these reduced specifications.
Q: What packaging formats are available for substitute parts?
A: Substitute parts are available in multiple packaging formats: cut tape and digi-reel (standard for high-volume assembly), tube (for lower-volume applications), and tape and reel (for automated handling). Select packaging format based on your assembly process and volume requirements. All substitute parts maintain identical 8-SOIC package footprint.
Q: Are all substitute parts ROHS3 compliant?
A: Yes, all recommended substitute parts are ROHS3 compliant, meeting environmental and regulatory requirements for lead-free manufacturing and hazardous substance restrictions.
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