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LM293D Equivalent & Substitute Parts
Part Overview
The LM293D is a general-purpose dual comparator IC manufactured by Texas Instruments in 8-SOIC surface mount packaging. This device features open-collector, open-drain, and rail-to-rail output configurations, operating across a wide supply voltage range of 2V to 36V (single supply) or ±1V to ±18V (dual supply). The LM293D is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. Substitute parts must maintain functional equivalence in comparator topology, output characteristics, and electrical performance within the specified operating parameters.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | LM293D |
| Manufacturer | Texas Instruments |
| Category | Linear |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) |
| Type | General Purpose |
| Number of Elements | 2 |
| Output Type | Open-Collector, Open-Drain, Rail-to-Rail |
| Voltage - Supply, Single/Dual (±) | 2V ~ 36V, ±1V ~ 18V |
| Voltage - Input Offset (Max) | 5mV @ 30V |
| Current - Input Bias (Max) | 0.25µA @ 5V |
| Current - Output (Typ) | 20mA |
| Current - Quiescent (Max) | 2.5mA |
| Operating Temperature | -25°C ~ 85°C |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the LM293D is determined by strict equivalence in the following critical parameters:
Mandatory Equivalence Criteria:
- Dual comparator topology (2 independent comparators per package)
- 8-SOIC surface mount package (0.154", 3.90mm width)
- Open-collector output configuration
- Supply voltage range: 2V ~ 36V (single) or ±1V ~ 18V (dual)
- Input offset voltage: 5mV maximum specification
- Input bias current: 0.25µA maximum specification
- Output current capability: minimum 16mA typical
- Quiescent current: 2.5mA maximum specification
- RoHS3 compliance
Substitute parts are grouped into three categories based on product status and availability:
Direct Substitutes (Same Packaging & Supplier): Parts with identical 8-SOIC packaging and active product status from the same or equivalent suppliers.
Upgrade Substitutes (Enhanced Performance): Parts with improved specifications (lower quiescent current, extended temperature range) while maintaining core electrical equivalence.
Manufacturer Recommended Substitutes (Alternative Packaging): Parts from alternative manufacturers meeting all electrical criteria but with different package designations (8-SOP vs. 8-SOIC) or enhanced features (automotive grade, lower input offset).
Parameter Comparison
| Part Number | Manufacturer | Product Status | Package | Output Type | Supply Voltage | Input Offset (Max) | Output Current (Typ) | Quiescent Current (Max) | Operating Temp | MSL |
|---|---|---|---|---|---|---|---|---|---|---|
| LM293D | Texas Instruments | Obsolete | 8-SOIC (0.154") | Open-Collector, Open-Drain, Rail-to-Rail | 2V~36V, ±1V~18V | 5mV @ 30V | 20mA | 2.5mA | -25°C ~ 85°C | 1 |
| LM293DR | Texas Instruments | Active | 8-SOIC (0.154") | Open-Collector, Open-Drain, Rail-to-Rail | 2V~36V, ±1V~18V | 5mV @ 30V | 20mA | 2.5mA | -25°C ~ 85°C | 1 |
| AS393MTR-E1 | Diodes Incorporated | Active | 8-SOIC (0.154") | Open-Collector | 2V~36V, ±1V~18V | 5mV @ 5V | 16mA @ 5V | 1mA | -40°C ~ 85°C | 3 |
| AS393MTR-G1 | Diodes Incorporated | Active | 8-SOIC (0.154") | Open-Collector | 2V~36V, ±1V~18V | 5mV @ 5V | 16mA @ 5V | 1mA | -40°C ~ 85°C | 3 |
| LM193DT | STMicroelectronics | Active | 8-SOIC (0.154") | Open-Collector, Rail-to-Rail | 2V~36V, ±1V~18V | 5mV @ 30V | 18mA @ 5V | 2.5mA | -55°C ~ 125°C | 1 |
| AP393SG-13 | Diodes Incorporated | Active | 8-SOP (0.154") | Open-Collector | 2V~36V, ±1V~18V | 5mV @ 5V | 16mA | 2.5mA | 0°C ~ 70°C | 3 |
| AS393AMTR-E1 | Diodes Incorporated | Active | 8-SOIC (0.154") | Open-Collector | 2V~36V, ±1V~18V | 3mV @ 5V | 16mA @ 5V | 1mA | -40°C ~ 85°C | 1 |
| AS393AMTR-G1 | Diodes Incorporated | Active | 8-SOIC (0.154") | Open-Collector | 2V~36V, ±1V~18V | 3mV @ 1.4V | 16mA | 1mA | -40°C ~ 85°C | 1 |
| BA10393F-E2 | Rohm Semiconductor | Active | 8-SOP (0.173") | Open-Collector | 2V~36V, ±1V~18V | 5mV @ 5V | 16mA @ 5V | 1mA | -40°C ~ 85°C | 1 |
| BA2903SF-E2 | Rohm Semiconductor | Active | 8-SOP (0.173") | Open-Collector | 2V~36V, ±1V~18V | 7mV @ 5V | 16mA @ 5V | 1mA | -40°C ~ 105°C | 1 |
| BA2903YF-CE2 | Rohm Semiconductor | Active | 8-SOP (0.173") | Open-Collector | 2V~36V, ±1V~18V | 4mV @ 5V | 16mA @ 5V | 1mA | -40°C ~ 125°C | 1 |
Engineering Selection Recommendations
Tier 1 - Direct Replacement (Recommended for Standard Applications):
LM293DR is the primary direct substitute for LM293D. Both parts are manufactured by Texas Instruments, share identical electrical specifications, and maintain the same 8-SOIC package footprint. LM293DR is active product status with high inventory availability (100,284 pcs), ensuring supply continuity. This part requires no design modifications and provides pin-for-pin compatibility.
Tier 2 - Electrical Equivalent with Enhanced Features (Recommended for New Designs):
LM193DT (STMicroelectronics) provides superior performance with extended operating temperature range (-55°C to 125°C) compared to the LM293D (-25°C to 85°C), while maintaining identical electrical specifications and 8-SOIC packaging. This part is suitable for industrial and extended-temperature applications. MSL rating of 1 matches the original part.
AS393AMTR-E1 and AS393AMTR-G1 (Diodes Incorporated) offer improved input offset voltage (3mV vs. 5mV) and reduced quiescent current (1mA vs. 2.5mA), resulting in lower power consumption. Both maintain 8-SOIC packaging and MSL-1 rating. These parts are recommended for power-sensitive applications.
Tier 3 - Alternative Package Substitutes (For PCB Layout Flexibility):
BA10393F-E2, BA2903SF-E2, and BA2903YF-CE2 (Rohm Semiconductor) provide functional equivalence in 8-SOP packaging (0.173" width vs. 0.154" for SOIC). BA2903YF-CE2 includes automotive-grade qualification (AEC-Q100) and extended temperature range (-40°C to 125°C), suitable for automotive applications. These parts require PCB layout modifications due to different package dimensions.
AP393SG-13 (Diodes Incorporated) operates within a narrower temperature range (0°C to 70°C) and is not recommended for extended-temperature applications.
Compliance Considerations:
All substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the original LM293D certification requirements. MSL ratings vary between 1 (unlimited) and 3 (168 hours), affecting moisture handling during assembly. Parts with MSL-1 rating (LM293DR, LM193DT, AS393AMTR-E1, AS393AMTR-G1, BA10393F-E2, BA2903SF-E2, BA2903YF-CE2) are preferred for standard manufacturing environments.
Frequently Asked Questions (FAQ)
Q: Can LM293DR be used as a direct replacement for LM293D without PCB modifications?
A: Yes. LM293DR is a pin-for-pin equivalent with identical 8-SOIC packaging, electrical specifications, and supply voltage range. No design changes are required.
Q: What is the primary advantage of AS393AMTR-E1 over LM293D?
A: AS393AMTR-E1 reduces quiescent current from 2.5mA to 1mA and improves input offset voltage to 3mV, resulting in lower power consumption. However, it operates at a narrower temperature range (-40°C to 85°C vs. -25°C to 85°C) and has MSL-3 rating requiring controlled moisture handling.
Q: Are 8-SOP packaged parts (BA10393F-E2, BA2903SF-E2) compatible with LM293D PCBs?
A: No. While electrically equivalent, 8-SOP packages have different pin spacing and body dimensions (0.173" width vs. 0.154" for SOIC). PCB layout and footprint modifications are required. These parts are suitable only for new designs with updated layouts.
Q: Which substitute part has the widest operating temperature range?
A: BA2903YF-CE2 operates from -40°C to 125°C, providing the widest temperature coverage. It also includes automotive-grade qualification (AEC-Q100) and is recommended for automotive and extended-temperature industrial applications.
Q: What does MSL-3 (168 hours) mean for AS393MTR-E1 and AS393MTR-G1?
A: MSL-3 indicates the component can be exposed to moisture for a maximum of 168 hours before soldering. These parts require controlled storage conditions and faster assembly processing compared to MSL-1 parts (unlimited moisture exposure). Standard manufacturing environments typically prefer MSL-1 rated components.
Q: Is LM193DT suitable for replacing LM293D in all applications?
A: LM193DT is suitable for most applications due to identical electrical specifications and superior temperature range (-55°C to 125°C). The primary consideration is MSL-1 rating and active product status. Verify output current requirements (18mA typical vs. 20mA for LM293D) for high-current switching applications.
Q: Can multiple substitute parts be used interchangeably in the same design?
A: Parts within the same package family (8-SOIC: LM293DR, AS393MTR-E1, AS393MTR-G1, LM193DT, AS393AMTR-E1, AS393AMTR-G1) are pin-compatible and can be used interchangeably. However, verify quiescent current, input offset voltage, and temperature range specifications for your specific application requirements. Parts in different packages (8-SOP) require separate PCB designs.
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