What Is the BAT85? Schottky Signal Diode and Uses
October 19, 2026 4 min read
Quick answer
The BAT85 is a small-signal Schottky diode. With a very low forward drop (~0.4 V) and fast switching it is used in RF/signal detectors, low-voltage logic and low-loss circuits (30 V, ~200 mA, DO-35). Against the ~0.7 V of the 1N4148, its low drop makes a clear difference for low-level signals.
The BAT85 is a small-signal Schottky diode. With a very low forward drop (~0.4 V) and fast switching, it is used in low-level signal and detector circuits where loss is critical. For the concept, see what is a Schottky diode.
What is the BAT85 used for?
RF/signal detectors, low-voltage logic gates, low-loss freewheeling and precise measurement circuits. Against the ~0.7 V drop of the 1N4148, the BAT85's ~0.4 V makes a clear difference for low-level signals.
Specifications
| Parameter | Value |
|---|---|
| Type | Schottky signal diode |
| Reverse voltage (VR) | 30 V |
| Forward current | ~200 mA |
| Forward drop (VF) | ~0.4 V |
| Body | DO-35 (glass) |
Equivalents
- BAT54 / BAT43: Schottky signal alternatives (BAT54 is SMD).
- 1N5711: an RF Schottky.
- 1N4148: a signal diode with a higher drop but cheaper.
Find it in our catalog
Use the BAT85 search.
Frequently Asked Questions
What is the BAT85?+
The BAT85 is a small-signal Schottky diode. With a very low forward drop (~0.4 V) and speed it is used in RF/signal detectors and low-loss circuits (30 V, ~200 mA).
What is the difference between the BAT85 and 1N4148?+
The BAT85 is a Schottky and drops ~0.4 V; the 1N4148 is a normal silicon signal diode and drops ~0.7 V. For low-loss/detector work the BAT85 is better suited.
What voltage/current is the BAT85?+
Its reverse voltage is 30 V, forward current ~200 mA and forward drop ~0.4 V. It is in a DO-35 glass body.
What is an equivalent to the BAT85?+
The Schottky signal alternatives BAT54 (SMD)/BAT43; the 1N5711 for RF; the 1N4148 for a cheap normal signal diode.