| Electronic component: | Description: | Manuf. | Package | Pins | T°min | T°max | Datasheet |
|---|
| 1N4991 | Zener Voltage Regulator Diode | Microsemi-Corporation | E | - | - | - | 83 K |
| 1N4991US | Zener Voltage Regulator Diode | Microsemi-Corporation | - | - | - | - | 83 K |
| 2N4991 | Silicon bilateral switch | distributor | - | 3 | - | - | 10 M |
| MBS4991 | Silicon bidirectional switche | Motorola | - | 3 | -55°C | 125°C | 114 K |
| NTE4991 | Surge clamping, transient overvoltage suppressor, bidirectional. VR = 256.00V max reverse stand off voltage. | distributor | - | 2 | -65°C | 175°C | 26 K |
| UPD4991ACX | Calendar clock | NEC-Electronics-Inc- | - | - | - | - | 133 K |
| 1 |
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