onsemi ESD5Z3.3T1G, Zener TVS diode, 158W peak pulse power, 3.3V reverse standoff, unidirectional, SOD-523 package, -55°C to 150°C junction temperature.
| Parameter | Value |
|---|---|
| Type | Zener |
| Mounting | Surface Mount |
| Voltage - breakdown | 5V |
| Voltage - clamping (Max) @ ipp | 14.1V |
| Voltage - reverse standoff | 3.3V (Max) |
| Current - peak pulse (10/1000μs) | 11.2A (8/20µs) |
| Power - peak pulse | 158W |
| Power line protection | No |
| Capacitance @ frequency | 105pF @ 1MHz |
| Operating temperature | -55°C~150°C(TJ) |
| Package | Tape & Reel (TR); Cut Tape (CT) |
| Applications | General Purpose |
| Case | SC-79, SOD-523 |
| Unidirectional channels | 1 |
The ESD5Z3.3T1G is a Zener-type TVS diode from onsemi, rated for 158W peak pulse power (8/20µs waveform) and a reverse standoff voltage of 3.3V max. That standoff means it sits on a 3.3V supply line without conducting until a transient pushes the voltage past the 5V breakdown minimum — then it clamps at 14.1V max to shunt the energy away from the protected IC.
Yes. The reverse standoff voltage is 3.3V max, so the diode does not leak at the nominal rail voltage. It starts clamping above 5V (breakdown min) and holds the clamp at 14.1V max, which is well within the absolute-max ratings of most 3.3V CMOS inputs.
The base product number ESD5Z3.3 is shared — the suffix difference is typically a packaging or reel option. Both are the same die in the same SOD-523 package. Confirm the tape-and-reel quantity matches your assembly house requirements, but electrically they are interchangeable.
158W peak pulse power measured with an 8/20µs current waveform. That rating tells you how much transient energy the diode can absorb in a single event before the junction overheats.