1 Features
• Qualified for automotive applications
• AEC-Q100 test guidance with the following:
– Device temperature grade 1: –40°C to 125°C
ambient operating temperature range
• Reference voltage tolerance at 25°C:
– 1% (A Grade)
– 0.5% (B Grade)
• Typical temperature drift:
– 14 mV (Q Temp)
• Low output noise
• 0.2-Ω Typical output impedance
• Sink-current capability: 1 mA to 100 mA
• Adjustable output voltage: VREF to 36 V

2 Applications
• Adjustable voltage and current referencing
• Secondary side regulation in flyback SMPSs
• Zener replacement
• Voltage monitoring
• Comparator with integrated reference

3 Description
The TL431LI-Q1 / TL432LI-Q1 are pin-to-pin
alternatives to TL431-Q1 / TL432-Q1. TL43xLI-Q1
offers better stability, lower temperature drift
(VI(dev)), and lower reference current (Iref) for
improved system accuracy.
The TL431-Q1 is a three-pin adjustable shunt
regulator with specified thermal stability over
applicable automotive temperature ranges. The
output voltage can be set to any value from VREF
(approximately 2.5 V) to 36 V, with two external
resistors (see Figure 28). This device has a typical
output impedance of 0.2 Ω. Active output circuitry
provides a sharp turnon characteristic, making this
device an excellent replacement for Zener diodes in
many applications, such as onboard regulation,
adjustable power supplies, and switching power
supplies.
The TL432-Q1 has exactly the same functionality and
electrical specifications as the TL431-Q1 device, but
has a different pinout for the DBZ package.