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KA393D Equivalent & Substitute Parts
Part Overview
The KA393D is a dual general-purpose comparator manufactured by onsemi in 8-SOIC surface-mount packaging. This device operates across a wide supply voltage range of 2V to 36V (single supply) or ±1V to ±18V (dual supply), with a maximum input offset voltage of 5mV at 5V and typical output current of 18mA at 5V. The KA393D is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | KA393D |
| Manufacturer | onsemi |
| Category | Linear |
| Type | General Purpose Comparator |
| Number of Elements | 2 |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| Voltage - Supply, Single/Dual (±) | 2V ~ 36V, ±1V ~ 18V |
| Voltage - Input Offset (Max) | 5mV @ 5V |
| Current - Input Bias (Max) | 0.25µA @ 5V |
| Current - Output (Typ) | 18mA @ 5V |
| Current - Quiescent (Max) | 2.5mA |
| Operating Temperature | 0°C ~ 70°C |
| Product Status | Obsolete |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
| REACH Status | REACH Unaffected |
Substitute Part Grouping Explanation
Substitution of the KA393D is determined by the following critical parameters:
- Dual comparator configuration (2 elements)
- General-purpose comparator type
- Supply voltage range: 2V ~ 36V (single) or ±1V ~ ±18V (dual)
- Input offset voltage specification: 5mV maximum at rated voltage
- Input bias current: 0.25µA maximum at 5V
- Output current capability: minimum 16mA typical
- Quiescent current: 2.5mA maximum
- 8-SOIC surface-mount package (0.154" width, 3.90mm)
- Operating temperature range: minimum 0°C lower bound
Substitute parts must maintain compatibility across these parameters. Output type variations (open-collector, rail-to-rail) are acceptable provided electrical performance remains within specification. Package width tolerance (0.154" to 0.173") is acceptable for 8-SOIC variants. Extended operating temperature ranges and automotive qualifications represent enhancements and do not preclude substitution.
Parameter Comparison
| Part Number | Manufacturer | Product Status | Supply Voltage | Input Offset (Max) | Input Bias (Max) | Output Current (Typ) | Quiescent Current (Max) | Operating Temp | Package |
|---|---|---|---|---|---|---|---|---|---|
| KA393D | onsemi | Obsolete | 2V~36V, ±1V~18V | 5mV @ 5V | 0.25µA @ 5V | 18mA @ 5V | 2.5mA | 0°C ~ 70°C | 8-SOIC (3.90mm) |
| LM393DR2G | onsemi | Active | 2V~36V, ±1V~18V | 5mV @ 30V | 0.25µA @ 5V | 16mA @ 5V | 2.5mA | 0°C ~ 70°C | 8-SOIC (3.90mm) |
| BA10393F-E2 | Rohm Semiconductor | Active | 2V~36V, ±1V~18V | 5mV @ 5V | 0.25µA @ 5V | 16mA @ 5V | 1mA | -40°C ~ 85°C | 8-SOP (4.40mm) |
| BA2903SF-E2 | Rohm Semiconductor | Active | 2V~36V, ±1V~18V | 7mV @ 5V | 0.25µA @ 5V | 16mA @ 5V | 1mA | -40°C ~ 105°C | 8-SOP (4.40mm) |
| BA2903YF-CE2 | Rohm Semiconductor | Active | 2V~36V, ±1V~18V | 4mV @ 5V | 0.25µA @ 5V | 16mA @ 5V | 1mA | -40°C ~ 125°C | 8-SOP (4.40mm) |
| LM193DT | STMicroelectronics | Active | 2V~36V, ±1V~18V | 5mV @ 30V | 0.25µA @ 5V | 18mA @ 5V | 2.5mA | -55°C ~ 125°C | 8-SOIC (3.90mm) |
| LM2903DT | STMicroelectronics | Active | 2V~36V, ±1V~18V | 7mV @ 5V | 0.25µA @ 5V | 16mA @ 5V | 2.5mA | -40°C ~ 125°C | 8-SOIC (3.90mm) |
| LM2903HYDT | STMicroelectronics | Active | 2V~36V, ±1V~18V | 7mV @ 30V | 0.25µA @ 5V | 16mA @ 5V | 2.5mA | -40°C ~ 150°C | 8-SOIC (3.90mm) |
| LM2903QDG4 | Texas Instruments | Obsolete | 2V~36V, ±1V~18V | 7mV @ 30V | 0.25µA @ 5V | 20mA | 2.5mA | -40°C ~ 125°C | 8-SOIC (3.90mm) |
| LM2903VQDRG4Q1 | Texas Instruments | Last Time Buy | 2V~36V, ±1V~18V | 7mV @ 5V | 0.25µA @ 5V | 20mA | 2.5mA | -40°C ~ 125°C | 8-SOIC (3.90mm) |
| LM2903YDT | STMicroelectronics | Active | 2V~36V, ±1V~18V | 7mV @ 5V | 0.25µA @ 5V | 16mA @ 5V | 2.5mA | -40°C ~ 125°C | 8-SOIC (3.90mm) |
Engineering Selection Recommendations
For new designs and production transitions from the obsolete KA393D, the following active-status parts are recommended:
Primary Recommendation: LM193DT (STMicroelectronics) This part maintains identical electrical performance to the KA393D with 18mA typical output current and 2.5mA quiescent current. It uses the same 8-SOIC (3.90mm) package, ensuring direct mechanical compatibility. Active product status guarantees long-term availability. Extended operating temperature range (-55°C to 125°C) provides additional design margin.
Alternative: LM393DR2G (onsemi) Maintains the same manufacturer as the original KA393D with active product status. Electrical specifications are equivalent within tolerance. Same package footprint. Suitable for designs with standard industrial temperature requirements (0°C to 70°C).
For Automotive Applications: LM2903HYDT or LM2903YDT (STMicroelectronics) Both parts carry AEC-Q100 automotive qualification and extended temperature ratings (-40°C to 150°C and -40°C to 125°C respectively). Electrical performance meets or exceeds KA393D specifications. Recommended for automotive-grade designs.
Package Consideration: Rohm Semiconductor BA Series BA10393F-E2, BA2903SF-E2, and BA2903YF-CE2 use 8-SOP packaging (4.40mm width) instead of 8-SOIC (3.90mm). These parts are electrically compatible but require PCB layout modification. BA2903YF-CE2 offers the lowest input offset voltage (4mV) and automotive qualification (AEC-Q100).
Parts with obsolete or last-time-buy status (LM2903QDG4, LM2903VQDRG4Q1) should not be selected for new designs despite electrical compatibility.
Frequently Asked Questions (FAQ)
Q: Can I directly replace KA393D with LM393DR2G without PCB changes? A: Yes. Both use 8-SOIC packaging with 3.90mm width and identical pin configuration. No layout modifications are required.
Q: What is the difference between 8-SOIC and 8-SOP packages? A: Both are 8-pin surface-mount packages with similar footprints. The primary difference is body width: 8-SOIC is 3.90mm while 8-SOP is 4.40mm. Rohm Semiconductor BA series parts use 8-SOP. PCB pad layouts must accommodate the wider body, though many designs allow this tolerance.
Q: Why do some substitute parts have higher input offset voltage (7mV vs 5mV)? A: Input offset voltage specifications are measured at different reference voltages. LM2903 series parts specify 7mV at 5V, while KA393D specifies 5mV at 5V. Both remain within acceptable comparator performance for general-purpose applications. Verify against your specific circuit requirements.
Q: Is LM2903HYDT suitable for automotive applications? A: Yes. LM2903HYDT carries AEC-Q100 qualification and operates from -40°C to 150°C, meeting automotive-grade requirements. It is actively produced by STMicroelectronics.
Q: What is the difference between active, last-time-buy, and obsolete status? A: Active parts are in full production with guaranteed long-term availability. Last-time-buy parts have limited remaining inventory before discontinuation. Obsolete parts are no longer manufactured. For new designs, select only active-status parts.
Q: Can I use BA2903YF-CE2 in a non-automotive application? A: Yes. BA2903YF-CE2 is automotive-qualified but fully functional in standard industrial applications. Its superior input offset voltage (4mV) and extended temperature range (-40°C to 125°C) provide design margin benefits even in non-automotive circuits.
Q: What is REACH compliance and why does it matter? A: REACH is a European Union regulation on chemical safety. All listed parts show "REACH Unaffected" status, indicating compliance with environmental and safety standards. This is standard for modern semiconductor components.
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