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LM293AMX Equivalent & Substitute Parts
Part Overview
The LM293AMX is a dual general-purpose comparator IC manufactured by onsemi in 8-SOIC surface-mount packaging. This device features open-collector, open-drain, and rail-to-rail output configurations, supporting supply voltages from 2V to 36V (single) or ±1V to ±18V (dual). The LM293AMX is currently classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | LM293AMX |
| Manufacturer | onsemi |
| Category | Linear Comparator |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) |
| 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) | 2mV @ 5V |
| Current - Input Bias (Max) | 0.25µA @ 5V |
| Current - Output (Typ) | 18mA @ 5V |
| Current - Quiescent (Max) | 2.5mA |
| Operating Temperature | -25°C ~ 85°C |
| Mounting Type | Surface Mount |
| Product Status | Obsolete |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution eligibility for the LM293AMX is determined by the following critical parameters:
Primary Compatibility Criteria:
- Package type: 8-SOIC (0.154", 3.90mm Width) or functionally equivalent 8-pin surface-mount packages
- Number of elements: 2 comparators
- Output type: Open-collector or open-drain configuration
- Supply voltage range: 2V ~ 36V (single) or ±1V ~ 18V (dual)
- Input offset voltage: Maximum 5mV @ 30V or better
- Input bias current: Maximum 0.25µA @ 5V
- Output current: Minimum 16mA @ 5V
- Quiescent current: Maximum 2.5mA
- Operating temperature: Minimum -25°C to 85°C coverage
Secondary Considerations:
- RoHS compliance status
- Moisture sensitivity level
- Product status (active preferred over obsolete)
Substitute parts meeting these electrical and mechanical parameters are functionally interchangeable in applications designed for the LM293AMX.
Parameter Comparison
| Part Number | Manufacturer | Package | Output Type | Supply Voltage | Input Offset (Max) | Output Current (Typ) | Quiescent Current (Max) | Operating Temp | Product Status |
|---|---|---|---|---|---|---|---|---|---|
| LM293AMX | onsemi | 8-SOIC (3.90mm) | Open-Collector, Open-Drain, Rail-to-Rail | 2V ~ 36V, ±1V ~ 18V | 2mV @ 5V | 18mA @ 5V | 2.5mA | -25°C ~ 85°C | Obsolete |
| LM293DR2G | onsemi | 8-SOIC (3.90mm) | Open-Collector, Open-Drain, Rail-to-Rail | 2V ~ 36V, ±1V ~ 18V | 5mV @ 30V | 16mA @ 5V | 2.5mA | -25°C ~ 85°C | Active |
| LM393DR2G | onsemi | 8-SOIC (3.90mm) | Open-Collector, Rail-to-Rail | 2V ~ 36V, ±1V ~ 18V | 5mV @ 30V | 16mA @ 5V | 2.5mA | 0°C ~ 70°C | Active |
| BA10393F-E2 | Rohm Semiconductor | 8-SOP (4.40mm) | Open-Collector | 2V ~ 36V, ±1V ~ 18V | 5mV @ 5V | 16mA @ 5V | 1mA | -40°C ~ 85°C | Active |
| BA2903SF-E2 | Rohm Semiconductor | 8-SOP (4.40mm) | Open-Collector | 2V ~ 36V, ±1V ~ 18V | 7mV @ 5V | 16mA @ 5V | 1mA | -40°C ~ 105°C | Active |
| BA2903YF-CE2 | Rohm Semiconductor | 8-SOP (4.40mm) | Open-Collector | 2V ~ 36V, ±1V ~ 18V | 4mV @ 5V | 16mA @ 5V | 1mA | -40°C ~ 125°C | Active |
| LM193DT | STMicroelectronics | 8-SOIC (3.90mm) | Open-Collector, Rail-to-Rail | 2V ~ 36V, ±1V ~ 18V | 5mV @ 30V | 18mA @ 5V | 2.5mA | -55°C ~ 125°C | Active |
| LM2903AM8-13 | Diodes Incorporated | 8-MSOP (3.00mm) | General Purpose | 2V ~ 36V, ±1V ~ 18V | 2mV @ 5V | 16mA @ 5V | 1.7mA | -40°C ~ 125°C | Active |
| LM2903DT | STMicroelectronics | 8-SOIC (3.90mm) | Open-Collector, Rail-to-Rail | 2V ~ 36V, ±1V ~ 18V | 7mV @ 5V | 16mA @ 5V | 2.5mA | -40°C ~ 125°C | Active |
| LM2903HYDT | STMicroelectronics | 8-SOIC (3.90mm) | Open-Collector, Rail-to-Rail | 2V ~ 36V, ±1V ~ 18V | 7mV @ 30V | 16mA @ 5V | 2.5mA | -40°C ~ 150°C | Active |
| LM2903M8-13 | Diodes Incorporated | 8-MSOP (3.00mm) | General Purpose | 2V ~ 36V, ±1V ~ 18V | 7mV @ 5V | 16mA @ 5V | 1.7mA | -40°C ~ 125°C | Active |
Engineering Selection Recommendations
Direct Package Match (8-SOIC, 3.90mm Width):
LM293DR2G, LM393DR2G, LM193DT, LM2903DT, and LM2903HYDT maintain the original 8-SOIC package footprint. These parts are recommended for applications requiring minimal PCB layout modifications. LM293DR2G and LM193DT provide the closest electrical match to the LM293AMX with active product status and RoHS3 compliance.
Alternative Package Options (8-SOP, 4.40mm Width):
BA10393F-E2, BA2903SF-E2, and BA2903YF-CE2 from Rohm Semiconductor use a slightly wider 8-SOP package. These parts require PCB footprint adjustment but offer lower quiescent current (1mA) and extended temperature ranges. BA2903YF-CE2 includes automotive-grade qualification (AEC-Q100) and operates to 125°C.
Compact Package Alternative (8-MSOP, 3.00mm Width):
LM2903AM8-13 and LM2903M8-13 from Diodes Incorporated use a narrower 8-MSOP package suitable for space-constrained applications. Both parts are active, RoHS3 compliant, and support the full -40°C to 125°C operating range.
Product Status Consideration:
All recommended substitutes carry active product status, ensuring long-term availability and supply chain stability compared to the obsolete LM293AMX.
Frequently Asked Questions (FAQ)
Q: Can LM293DR2G directly replace LM293AMX without PCB modifications?
A: Yes. LM293DR2G uses the identical 8-SOIC (3.90mm) package and meets all electrical parameters. Both are onsemi products with matching supply voltage ranges, output types, and quiescent current specifications.
Q: What is the difference between LM293DR2G and LM393DR2G?
A: Both use 8-SOIC packaging and share identical supply voltage and output current specifications. LM393DR2G operates over a narrower temperature range (0°C ~ 70°C versus -25°C ~ 85°C) and lacks the open-drain output type designation. LM293DR2G is preferred for applications requiring the full -25°C to 85°C range.
Q: Are Rohm Semiconductor BA2903 and BA10393 series compatible with the LM293AMX?
A: Electrically compatible, but package dimensions differ. These parts use 8-SOP (4.40mm width) versus the original 8-SOIC (3.90mm). PCB footprint redesign is required. BA2903YF-CE2 offers automotive qualification and extended temperature range (-40°C ~ 125°C).
Q: Why would I choose LM2903 variants over LM293 or LM393?
A: LM2903 parts from STMicroelectronics and Diodes Incorporated offer extended temperature ranges (-40°C to 125°C or higher) and lower quiescent current in some variants. Diodes Incorporated LM2903M8-13 uses a compact 8-MSOP package for space-constrained designs.
Q: Is RoHS3 compliance required for substitution?
A: All active substitute parts listed carry RoHS3 compliance. This is standard for current production comparators and ensures regulatory alignment with modern manufacturing requirements.
Q: Can I use LM2903HYDT in automotive applications?
A: Yes. LM2903HYDT from STMicroelectronics includes AEC-Q100 automotive qualification and operates to 150°C, making it suitable for automotive-grade designs requiring extended temperature performance.
Q: What is the impact of package width differences (3.90mm vs. 4.40mm)?
A: Package width affects PCB footprint spacing and trace routing. The 3.90mm 8-SOIC (LM293AMX, LM293DR2G, LM193DT, LM2903DT, LM2903HYDT) requires no layout changes. The 4.40mm 8-SOP (Rohm parts) and 3.00mm 8-MSOP (Diodes parts) require footprint redesign.
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