1 Features
1• 0.4% Initial Voltage Tolerance
• 0.2-Ω Typical Output Impedance
• Fast Turnon: 500 ns
• Sink Current Capability: 1 to 100 mA
• Low Reference Current (REF)
• Adjustable Output Voltage: VI(ref) to 36 V
• Supports Defense, Aerospace, and Medical
Applications
– Controlled Baseline
– One Assembly and Test Site
– One Fabrication Site
– Available in Military (–55°C to 125°C)
Temperature Range
– Extended Product Life Cycle
– Extended Product-Change Notification
– Product Traceability

2 Applications
• Shunt Regulators
• Temperature-Compensated Comparators
• PWM Converter Reference
• Photodiode Reference Drivers
• Precision Current Limiters
• Precision Current Sink

3 Description
The TL1431-EP device is a precision-programmable
reference with specified thermal stability over the
military temperature range. The output voltage can be
set to any value from VI(ref) (approximately 2.5 V) to
36 V with two external resistors (see Figure 21). This
device has a typical output impedance of 0.2 Ω.
Active output circuitry provides a very sharp turnon
characteristic, making the device an excellent
replacement for Zener diodes and other types of
references in applications such as onboard
regulation, adjustable power supplies, and switching
power supplies.