| Manufacturer | Part Number | Description |
|---|---|---|
NEC (now Renesas Electronics) |
UPC4557 | Dual High-Performance Operational Amplifier |
| Unknown Manufacturer | UPC4557C | Operational Amplifier |
Inchange Semiconductor |
2SC4557 | NPN Transistor |
| Unknown Manufacturer | UPC4557 | UPC4557 |
Allegro MicroSystems |
C4557 | 2SC4557 |
| Unknown Manufacturer | C4557C | UPC4557C |
Sanken |
2SC4557 | NPN TRANSISTOR |
Linear Technology (now Analog Devices) |
LTC4557 | Dual SIM/Smart Card Power Supply/Interface |
SavantIC |
2SC4557 | SILICON POWER TRANSISTOR |
