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| PartNumber | 1N4557B | 1N4557A | 1N4557 |
| Description | Zener Diodes Zener Diodes | Zener Diodes Zener Diodes | General Purpose Relays 8A 24V 1FORMA/1FORMB 2 COIL LATCHING PCB |
| Manufacturer | Microchip | Microchip | Microsemi Corporation |
| Product Category | Zener Diodes | Zener Diodes | Diodes - Zener - Single |
| RoHS | N | N | - |
| Packaging | Tray | Tray | Bulk |
| Brand | Microchip / Microsemi | Microchip / Microsemi | - |
| Product Type | Zener Diodes | Zener Diodes | - |
| Factory Pack Quantity | 1 | 1 | - |
| Subcategory | Diodes & Rectifiers | Diodes & Rectifiers | - |
| Series | - | - | - |
| Package Case | - | - | TO-204AD |
| Operating Temperature | - | - | -65°C ~ 175°C |
| Mounting Type | - | - | Through Hole |
| Supplier Device Package | - | - | TO-204AD (TO-3) |
| Tolerance | - | - | ±10% |
| Power Max | - | - | 50W |
| Voltage Zener Nom Vz | - | - | 3.9V |
| Impedance Max Zzt | - | - | 0.16 Ohm |
| Current Reverse Leakage Vr | - | - | 150μA @ 500mV |
| Voltage Forward Vf Max If | - | - | 1.5V @ 10A |