Spark Logic

BAT46 small-signal Schottky diode connection guide

BAT46 small-signal Schottky diode DO-35 (DO-204AH) wiring guide with power, signal assignments, and bench checks.

DO-35 (DO-204AH)

2 contacts Current package

Vishay · Axial glass body, black band on the cathode.

Identify the cathode

Required

Disconnect the diode from other circuitry and locate the black cathode band.

Bench checks

  • In diode mode, connect meter positive to A and meter common to K. Reverse the probes and compare the readings.

Vishay BAT46, document 85662 Rev. 2.2

Connection scenarios

Measure forward drop at low current

Use a current-limited 5 V bench supply and a 1 kΩ resistor in series with the diode.

  • 5 V
    • Bench supply positive
    • R1.1
  • Anode node
  • Ground
    • Bench supply return
    • K (2)
    • Meter common
R1 1 kΩ between 5 V and Anode node5 VR1 1 kΩAnode node

Bench checks

  • The diode should show a positive forward voltage below 1 V in this few-milliampere fixture at room temperature.
  • Calculate current from the voltage across R1 divided by 1 kΩ. A reading near the full 5 V across the diode calls for a polarity and continuity check.

Vishay BAT46, document 85662 Rev. 2.2, electrical characteristics and forward curve. Supply and resistor are fixture choices.

DO-35 (DO-204AH) wiring map

Highlighted contacts are used in the required step or selected circuit. Select a contact to inspect it.

DO-35 (DO-204AH)
Contact order as described below. Match the package index or polarity mark before wiring.
Selected pin details

1 · A

Anode · Inputs

Unbanded anode. Conventional current enters here in forward conduction.

Vishay BAT46, document 85662 Rev. 2.2

Electrical limits · Pin in the reference

Models and documents

This page covers the Vishay DO-35 BAT46. BAT46W-V and LL46 use different outlines.

BAT46-TR
Tape and reel.
BAT46-TAP
Ammopack.