This device is a silicon planar power Zener diode intended for voltage stabilization and clipping circuits. The 1N4739A variant provides a nominal 9.1 V Zener voltage with ±5% tolerance and a 1.0 W power dissipation rating at 50°C ambient under the stated lead-temperature condition. It is supplied in a 2-pin axial DO-41 package, with glass or plastic case options noted in the datasheet, and has an approximate weight of 0.35 g. The datasheet lists a maximum forward voltage of 1.2 V at 200 mA, a maximum Zener impedance of 5 Ω, and operating limits up to 175°C junction temperature with -65°C to +175°C storage range.
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| Basic Package Type | Through Hole |
| Package Family Name | DO-204-AL |
| Package/Case | DO-41 |
| Package Description | Axial Lead Package |
| Lead Shape | Through Hole |
| Pin Count | 2 |
| PCB | 2 |
| Mounting | Through Hole |
| Jedec | DO-204AL |
| Type | Voltage Regulator |
| Configuration | Single |
| Nominal Zener Voltage | 9.1V |
| Maximum Zener Impedance | 5Ohm |
| Zener Voltage Tolerance | 5% |
| Maximum Power Dissipation | 1000mW |
| Maximum Reverse Leakage Current | 10uA |
| Maximum Regulator Current | 100@Ta=50CmA |
| Min Operating Temperature | -65°C |
| Max Operating Temperature | 175°C |
| Cage Code | 1C4D4 |
| HTS Code | 8541100050 |
| Schedule B | 8541100050 |
| ECCN | EAR99 |
| Radiation Hardening | No |
| RoHS Versions | 2002/95/EC |
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