TL431ASA-7

Overview

The TL431ASA-7 is an adjustable precision shunt voltage reference manufactured by Diodes Incorporated. It operates within a cathode voltage range of 2.5V to 36V and supports a maximum cathode current of 100mA. The device features an initial accuracy of ±0.5% and maintains operation across a temperature range of -40°C to +125°C. Packaged in a compact SOT-23 surface-mount format with three pins, it serves as a low-cost alternative to Zener diodes in power supply feedback loops.

Feature Summary

• Provides stable adjustable reference voltage via external resistor divider
• Ensures high precision with tight initial tolerance specifications
• Supports wide operating temperature range for industrial applications

Applications

• Switching regulator feedback control loops
• Portable equipment power management circuits
• Internal reference voltage sources for ADC/DAC interfaces

Procurement Notes

Verify the specific suffix 'A' confirms the ±0.5% accuracy grade required for your design. Confirm the 'S' indicates the SOT-23 package variant suitable for your PCB layout. Check current production status as availability may vary. Ensure compatibility with your system's thermal requirements given the specified operating temperature limits.

Selection Notes

Select this component when precise voltage regulation is needed in space-constrained designs. The SOT-23 package offers a small footprint compared to through-hole alternatives. Consider the 100mA current limit for load requirements. Verify that the ±0.5% accuracy meets your circuit's tolerance needs without requiring expensive trimming.

Part Context

This part belongs to the widely used TL431 family of programmable shunt regulators. It functions similarly to traditional Zener diodes but offers superior stability and adjustability. The series is standard in consumer electronics and industrial power supplies for providing accurate reference points in feedback networks.

Replacement Considerations

Compatible substitutes include the TL431B (±1% accuracy) or TL431C (±2% accuracy) if looser tolerances are acceptable. Other manufacturers offer pin-compatible equivalents such as the LM431 or KA431. Ensure any replacement matches the SOT-23 package and electrical characteristics.