2pk 1N4689-TF-A 5.1V, 0.5W Zener Diode.

Specs:

Tolerance: ±5%

Current - Reverse Leakage @ Vr: 10 µA @ 3 V

Voltage - Forward (Vf) (Max) @ If: 1.1 V @ 200 mA

Operating Temperature: -65°C ~ 175°C

Warning:

This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov