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| 1N990C | 160 V, zener diode | LRC | N/A | 2 | N/A | N/A | 1N990C datasheet (33K) |
| 1N990D | 0.5W, silicon zener diode. Zener voltage 160V. Test current 0.80mA. +-1% tolerance. | JGD | N/A | 2 | -55°C | 175°C | 1N990D datasheet (185K) |
| 1N991 | 0.5W, silicon zener diode. Zener voltage 180V. Test current 0.68mA. +-20% tolerance. | JGD | N/A | 2 | -55°C | 175°C | 1N991 datasheet (185K) |
| 1N991A | 180 V, zener diode | LRC | N/A | 2 | N/A | N/A | 1N991A datasheet (33K) |
| 1N991B | 0.5W, silicon zener diode. Zener voltage 180V. Test current 0.68mA. +-5% tolerance. | JGD | N/A | 2 | -55°C | 175°C | 1N991B datasheet (185K) |
| 1N991B | 180 V, zener diode | LRC | N/A | 2 | N/A | N/A | 1N991B datasheet (33K) |
| 1N991B | 500 milliwatts glass silicon zener diode | Motorola | N/A | 2 | -65°C | 200°C | 1N991B datasheet (424K) |
| 1N991B | Zener Voltage Regulator Diode | Microsemi-Corporation | N/A | - | N/A | N/A | 1N991B datasheet (87K) |
| 1N991B | Zener Voltage Regulator Diode | Microsemi-Corporation | N/A | - | N/A | N/A | 1N991B datasheet (87K) |
| 1N991B-1 | Zener Voltage Regulator Diode | Microsemi-Corporation | N/A | - | N/A | N/A | 1N991B-1 datasheet (92K) |