1N4007 Diode: Features, Working Principle, Specifications & Applications

1N4007 Pinout

Anode (A) - positive terminal; Cathode (K) - negative terminal marked by a painted band. Current conducts from anode to cathode, blocking in reverse.

Specifications

Working Principle

The 1N4007 is a PN junction that allows current in one direction only. Under forward bias, it conducts with ~0.7–1.1 V drop. Under reverse bias, it blocks current until breakdown near its VRRM (1000 V). This one-way behavior enables efficient AC-to-DC rectification.

Circuit Symbol

 ----|>|----
   A      K 

Key Features

• High reverse voltage-handles up to 1000 V.
• 1 A average current with strong surge tolerance (30 A).
• Low leakage for stable DC outputs.
• Rugged, inexpensive, widely available.

1N4007 vs Other 1N400x Series

Compatibility: 1N4007 can replace any lower-voltage member of the family.

Applications

• AC/DC rectifier in adapters and linear power supplies.
• Bridge rectifier (x4 diodes) for full-wave conversion.
• Flyback/free-wheeling protection for relays and coils.
• Polarity protection at DC inputs.
• Clamping & limiting with zeners/capacitors.
• General DIY and educational projects.

How to Test a 1N4007 with a Multimeter

1. Set the meter to Diode Test mode.
2. Red probe to Anode, black to Cathode → reading ~0.6–0.7 V (forward drop).
3. Reverse the probes → meter shows OL (no conduction).

If it conducts both ways, the diode is shorted; if it shows OL both ways, it's open-replace it.

Circuit Example: Full-Wave Bridge Rectifier

 AC ~ ────┬────|>|────┬──── +VDC
                  |           |
                  |           |
                  └────|<|────┴──── 0V 

Four 1N4007 diodes form a bridge that rectifies both halves of the AC waveform for smoother DC (with a filter capacitor).

Equivalents & Replacements

Frequently Asked Questions