TS431ACX RFG

Overview

The TS431ACX RFG is a programmable shunt voltage reference manufactured by Taiwan Semiconductor in an SOT-23-3 package. It features a reference voltage of 2.495 V with an initial accuracy of ±1%. The device operates within a cathode voltage range of 2.495 V to 36 V and supports a continuous current range of 1 mA to 100 mA. It exhibits a temperature coefficient of 50 ppm/°C, a dynamic output impedance of 0.22 Ω, and a maximum power dissipation of 0.3 W. The component is AEC-Q101 qualified and RoHS compliant.

Feature Summary

• Programmable output voltage adjustable from the internal reference level up to 36 volts using external resistors
• Low dynamic output impedance for stable regulation across varying load conditions
• Fast turn-on response suitable for transient-sensitive applications
• AEC-Q101 automotive qualification ensuring reliability under specified operating temperatures

Applications

• Switching Mode Power Supplies (SMPS)
• Lighting systems
• Telecommunication equipment
• Home appliances

Procurement Notes

Verify the specific ordering code TS431ACX RFG against the manufacturer's datasheet to confirm the SOT-23 package and reel quantity specifications. Ensure that the application circuit accounts for stability requirements regarding load capacitance, as the device may oscillate with capacitances between 10nF and 1µF at low currents. Confirm compliance with moisture sensitivity level standards during storage and handling.

Selection Notes

Select this component when a precise, adjustable shunt regulator is required for voltage monitoring or reference generation. The ±1% accuracy of the 'A' grade variant suits general-purpose applications where tighter tolerances are not critical. Consider the thermal performance and power dissipation limits relative to the expected cathode current and ambient temperature conditions.

Part Context

This part belongs to the TS431 series of three-terminal programmable shunt regulator diodes. These integrated circuits function as low temperature coefficient zener diodes, offering a convenient replacement for standard zener diodes in digital voltmeters and op-amp circuitry. The series allows for stable reference generation from 5.0 V logic supplies.

Replacement Considerations

TS431BCX RFG

FAQ

What are the stability requirements for load capacitance?

The device exhibits instability with capacitances between approximately 10nF and 1µF at light cathode currents. To ensure stability, use no capacitance directly across the device or utilize a large capacitance (≥10µF). Local decoupling at the load should be kept ≤1nF if placed directly across the terminals.

How is the reference voltage programmed?

The output voltage is programmable from the internal reference voltage (2.495V) up to 36 volts using two external resistors connected to the reference pin.