The LM431 is a 3-terminal adjustable shunt regulator with ensured temperature stability over the entire temperature range of operation. The output voltage may be set at any level greater than 2.5 V (VREF) up to 36 V merely by selecting two external resistors that act as a voltage divided network. Due to the sharp turnon characteristics this device is an excellent replacement for many Zener diode applications.
The LM431 is available in space-saving SOIC-8, SOT-23, and TO-92 packages.
PART NUMBER | PACKAGE | BODY SIZE (NOM) |
---|---|---|
LM431 | SOIC (8) | 4.90 mm × 3.91 mm |
SOT-23 (3) | 2.92 mm × 1.30 mm | |
TO-92 (3) | 4.30 mm × 4.30 mm |
Changes from G Revision (March 2013) to H Revision
Changes from F Revision (April 2013) to G Revision
PIN | I/O | DESCRIPTION | |||
---|---|---|---|---|---|
NAME | SOIC | SOT-23 | TO-92 | ||
Anode | 2, 3, 6, 7 | 3 | 3 | O | Anode pin, normally grounded |
Cathode | 1 | 1 | 1 | I/O | Shunt current/output voltage |
NC | 4, 5 | — | — | — | No connect |
Reference | 8 | 2 | 2 | I | Reference pin for adjustable output voltage |