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| PartNumber | 1N978B | 1N978B BK | 1N978B TR |
| Description | Zener Diodes Zener Diodes | Zener Diodes 51Vz 125 Ohm 5uA 38.8 Vr 5.9mA 500mW | Zener Diodes 51Vz 125 Ohm 5uA 38.8 Vr 5.9mA 500mW |
| Manufacturer | Microchip | Central Semiconductor | Central Semiconductor |
| Product Category | Zener Diodes | Zener Diodes | Zener Diodes |
| RoHS | N | Y | Y |
| Vz Zener Voltage | 51 V | 51 V | 51 V |
| Mounting Style | Through Hole | Through Hole | Through Hole |
| Package / Case | DO-35-2 | DO-35 | DO-35 |
| Pd Power Dissipation | 500 mW | 500 mW | 500 mW |
| Voltage Tolerance | 5 % | 5 % | 5 % |
| Voltage Temperature Coefficient | 0.096 %/C | - | - |
| Zener Current | 5 uA | 5 uA | 5 uA |
| Zz Zener Impedance | 125 Ohms | 125 Ohms | 125 Ohms |
| Minimum Operating Temperature | - 65 C | - 65 C | - 65 C |
| Maximum Operating Temperature | + 175 C | + 200 C | + 200 C |
| Configuration | Single | Single | Single |
| Test Current | 2.5 mA | 2.5 mA | 2.5 mA |
| Packaging | Foil Bag | Bulk | Reel |
| Brand | Microchip / Microsemi | Central Semiconductor | Central Semiconductor |
| Product Type | Zener Diodes | Zener Diodes | Zener Diodes |
| Factory Pack Quantity | 1 | 2500 | 10000 |
| Subcategory | Diodes & Rectifiers | Diodes & Rectifiers | Diodes & Rectifiers |
| Vf Forward Voltage | 1.1 V | 1.5 V | 1.5 V |
| Diameter | - | 2.29 mm | 2.29 mm |
| Length | - | 5.08 mm | 5.08 mm |
| Ir Reverse Current | - | 5 uA | 5 uA |
| Part # Aliases | - | 1N978B BK PBFREE | 1N978B PBFREE TR |