Overview
The TL431AQDBZRQ1 is an automotive-qualified adjustable shunt regulator offering a precise 2.495 V reference voltage and tight 0.5% accuracy over temperature and operating conditions. It provides a wide operating cathode current from 1 mA to 100 mA, allowing flexible use as a precision reference, linear regulator element, voltage monitor, or comparator substitute. With an extended –40°C to +125°C temperature range, low 0.2 Ω dynamic impedance, and AEC-Q100 Grade 1 qualification, the TL431AQDBZRQ1 is well-suited for automotive systems, industrial controls, and precision power management circuits.
Core Parameters
| Parameter | Specification |
|---|---|
| Reference Voltage (Vref) | 2.495 V (±0.5%) |
| Cathode Voltage Range | Vref to 36 V |
| Cathode Current | 1 mA to 100 mA |
| Reference Input Current | 0.2 µA typical |
| Temperature Range | –40°C to +125°C |
| Dynamic Impedance | 0.2 Ω typical |
| Output Type | Adjustable shunt regulator |
| Package | SOT-23 (DBZ) |
Features
- Automotive-qualified (AEC-Q100 Grade 1)
- Adjustable output from 2.495 V to 36 V
- Precise 0.5% reference voltage tolerance
- Wide operating current range (1 mA to 100 mA)
- Low dynamic impedance (0.2 Ω typ.) provides tight load regulation
- Low reference input current reduces system losses
- Temperature-stable operation up to +125°C
- Compact SOT-23 package suitable for dense designs
Typical Application Scenarios
| Application | Why TL431AQDBZRQ1 Fits |
|---|---|
| Automotive Power Modules | AEC-Q100 reliability with precision 0.5% reference |
| Switching Power Supplies | Acts as error amplifier or precision regulation point |
| Battery Chargers | Stable reference ensures consistent charging voltage |
| Industrial Control Equipment | Low drift and low dynamic impedance improve regulation |
| LED Drivers | Used for constant-current reference shaping |
| Microcontroller Power Monitoring | Adjustable threshold with precise Vref |
Performance Comparison
| Specification | TL431AQDBZRQ1 | Typical 431 Shunt Regulator | General Zener Diode |
|---|---|---|---|
| Reference Voltage Accuracy | 0.5% | 1–2% | 5–10% |
| Dynamic Impedance | 0.2 Ω | 0.4–1 Ω | 10–30 Ω |
| Temperature Range | –40°C to +125°C | –20°C to 85°C | Limited |
| Adjustment Range | Up to 36 V | Up to 30 V | Fixed |
| Automotive Grade | Yes (Q1) | No | No |
Conclusion
The TL431AQDBZRQ1 provides precise, stable, and automotive-qualified voltage regulation performance ideal for modern power architectures. Its 2.495 V 0.5%-tolerance reference, wide 1–100 mA operating range, and ultra-low 0.2 Ω dynamic impedance deliver clean regulation in demanding automotive and industrial environments. For designers seeking a compact, accurate, and easy-to-use adjustable shunt regulator, the TL431AQDBZRQ1 stands out as a highly reliable solution.
Manufacturer Profile
Texas Instruments (TI) is a global leader in analog and embedded semiconductor solutions. With decades of innovation in power management, TI’s automotive-grade regulators and references deliver reliability, precision, and robust performance across automotive, industrial, and consumer electronics applications. The TL431AQDBZRQ1 continues this tradition with its high-accuracy adjustable shunt regulation and AEC-Q100 certification.
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