What Is the BAT54? SMD Schottky Diode (A/C/S) and Uses
The BAT54 is an SMD (SOT-23) small-signal Schottky diode. It is used in signal rectification, clamping and low-power switching. Its variants differ: BAT54 single, BAT54A dual/common anode, BAT54C dual/common cathode, BAT54S dual/series. It is for small-signal only; not suitable for power rectification.
The BAT54 is an SMD, small-signal Schottky diode. With its low forward voltage and speed it is common in signal rectification, clamping and low-power switching; in a SOT-23 body it comes as single and dual (BAT54A/C/S) versions. For the concept, see what is a Schottky diode.
What is the BAT54 used for?
Small-signal rectification, voltage clamping/protection, low-power switching and OR-ing. Its low forward drop (Schottky) and small SMD body make it a favourite in compact electronics.
Family variants (SOT-23)
| Part | Contents |
|---|---|
| BAT54 | Single diode |
| BAT54A | Dual diode, common anode |
| BAT54C | Dual diode, common cathode |
| BAT54S | Dual diode, series |
Watch out
Choosing the right variant (A/C/S) is critical; the connection topology differs. Being a Schottky it has reverse leakage and a low reverse-voltage limit (~30 V). It is for small-signal/low-current only; not suitable for power rectification.
Equivalents
- BAT85: a DIP small-signal Schottky.
- 1N5711: a high-speed small-signal Schottky.
- BAS40: a similar SMD Schottky family.
Find it in our catalog
Use the BAT54 search.