Basic Product Information
Part Number: TL431AIDBZR
Core Electrical Parameters
| Parameter |
Value |
Unit |
| Reference Voltage (Vref) |
2.495 (typ) |
V |
| Vref Tolerance (A-Grade, 25°C) |
±1% (2470 to 2520) |
mV |
| Adjustable Output Voltage Range |
Vref to 36 |
V |
| Cathode Current Range (Ika) |
1 to 100 |
mA |
| Minimum Cathode Current for Regulation |
0.4 (typ) / 0.6 (max) |
mA |
| Off-state Cathode Current |
0.1 (typ) / 0.5 (max) |
μA |
| Reference Input Current (Iref) |
2 (typ) / 4 (max) |
μA |
| Dynamic Output Impedance (typ) |
0.2 |
Ω |
| Vref Deviation over Temperature (I-temp) |
14 (typ) / 34 (max) |
mV |
| Ratio of Vref Change to VKA Change |
-1.4 to -2.7 |
mV/V |
| Absolute Max Cathode-Anode Voltage |
37 |
V |
| Operating Temperature |
-40 to +85 |
°C |
| Package Size (nominal) |
2.92 x 2.37 |
mm |
Core Features & Advantages
The TL431AIDBZR delivers a precision adjustable shunt voltage reference with 1% initial accuracy and sharp turn-on characteristics, making it an ideal replacement for Zener diodes in regulated power supplies.
- Primary Function: Three-terminal adjustable shunt regulator providing a stable reference voltage from Vref (~2.495V) to 36V with two external resistors, commonly used in isolated SMPS feedback loops.
- Advantages:
- A-Grade 1% initial accuracy at 25°C ensures tight output voltage regulation without trimming, improving power supply output tolerance.
- Sharp turn-on characteristic — active output circuitry provides a much steeper I-V curve than Zener diodes, enabling cleaner regulation thresholds and better transient response.
- Ultra-compact SOT-23-3 package — 2.92 x 2.37mm footprint saves PCB area in dense power supply designs compared to traditional TO-92 or SOT-89 alternatives.
Typical Application Scenarios
- Industry: Power Management / Industrial / Consumer / Server
- Equipment: AC/DC adapters, server PSUs, isolated DC-DC converters, battery chargers
- Use Cases:
- Isolated feedback loop in flyback/forward converters paired with an optocoupler for precise output voltage regulation.
- On-board voltage regulation and reference generation in rack server and industrial AC/DC power supplies.
- Zener diode replacement in adjustable voltage monitors and comparator reference circuits with tighter tolerance.
Market Reference Price
| Market |
Price Range |
Currency |
| Huaqiangbei Spot |
$0.03 – $0.08 |
USD |
| Overseas B2B |
$0.08 – $0.22 |
USD |
Related Models Comparison
| Model |
Difference |
Application |
| TL431BIDBZR |
B-Grade with 0.5% initial tolerance (±12mV), tighter Vref accuracy for precision regulation |
High-accuracy power supplies requiring <0.5% reference tolerance |
| TL431IDBZR |
Standard grade with 2% initial tolerance, lower cost for less critical applications |
General-purpose voltage monitoring and Zener replacement |
| TLV431AIDBZR |
Low-voltage version (Vref=1.24V), adjustable up to 6V, lower minimum cathode current (80μA) |
Low-voltage (3.3V) SMPS feedback and battery-powered systems |
