TL431BQDBZR Texas Instruments TL431BQDBZR Adjustable Precision Shunt Regulator
- ±0.5% Initial Voltage Accuracy (B-grade) – Superior precision for critical applications.
- Wide Adjustable Range (2.495V to 36V) – Flexible for diverse circuit requirements.
- 100mA Shunt Current Capacity – Strong handling for medium-power regulation.
- 92 PPM/°C Low Temp Drift – Ensures stability across industrial & automotive conditions.
The Texas Instruments TL431BQDBZR is a highly versatile adjustable precision shunt regulator, offering engineers an exceptional solution for voltage reference and regulation applications. This advanced three-terminal device provides high accuracy, temperature stability, and excellent noise performance, making it ideal for power supplies, battery management, and precision voltage control circuits. Packaged in a compact SOT-23-3 (TO-236-3) surface-mount form factor, it supports an adjustable output voltage from 2.495V (Vref) up to 36V, with ±0.5% initial tolerance (B-grade) and low output impedance (0.2Ω typical).
Designed for wide operating temperatures (-40°C to +125°C), the TL431BQDBZR surpasses traditional Zener diodes with sharper turn-on characteristics, better stability, and enhanced transient response. It features a low cathode current requirement (600 µA min), ensuring efficient operation in low-power designs, while its wide shunt current capability (1mA to 100mA) enables robust voltage clamping and regulation.
Key Applications
- Switching & Linear Power Supply Regulation
- Voltage Monitoring & Precision References
- Battery Management Systems
- Optocoupler Feedback Circuits
- Error Amplifiers & Control Loops
Product Attributes
| Attribute | Value / Specification |
|---|---|
| Base Product Number | TL431 |
| Brand | Texas Instruments |
| Current – Cathode | 700 µA |
| Current – Output | 100 mA |
| Description/Function | Adjustable Precision Shunt Regulator |
| Height | 1 mm |
| Initial Accuracy | 0.5 % |
| Length | 2.92 mm |
| Maximum Output Voltage | 36 V |
| Minimum Operating Temp | -40°C |
| Maximum Operating Temp | +125°C |
| Mounting Style | SMD/SMT |
| Output Type | Adjustable |
| Output Voltage (Min) | 2.495V (Vref) |
| Package / Case | SOT-23-3 (TO-236-3) |
| Product Category | Voltage References |
| Reference Type | Shunt |
| Series | TL431 |
| Shunt Current (Min) | 600 µA |
| Subcategory | PMIC – Power Management ICs |
| Temperature Coefficient | 92 PPM/°C (typical) |
| Tolerance | ±0.5% (B-grade) |
| Topology | Shunt References |
| Voltage – Output (Max) | 36 V |
Frequently Asked Questions (FAQ)
1. What makes the Texas Instruments TL431BQDBZR Adjustable Precision Shunt Regulator superior to traditional Zener diodes?
The TL431BQDBZR offers higher accuracy (±0.5% tolerance at 25°C), better temperature stability, and a sharper turn-on characteristic compared to Zener diodes. It also provides adjustable output voltage (2.495V to 36V) with low impedance (0.2Ω), making it far more flexible in regulation applications.
2. How does the Texas Instruments TL431BQDBZR achieve stable voltage regulation in harsh environments?
With an operating range of -40°C to +125°C and built-in thermal compensation, the TL431BQDBZR maintains low output drift (typical 92 PPM/°C), ensuring reliable performance in industrial, automotive, and high-temperature applications.
3. What are the key differences between the TL431BQDBZR and standard-grade shunt regulators?
The TL431BQDBZR is a B-grade device, meaning it delivers ±0.5% initial voltage tolerance, as opposed to the ±1% (A-grade) or ±2% (standard-grade) versions. It also supports extended temperature ranges up to 125°C.
4. Can the Texas Instruments TL431BQDBZR be used as a voltage reference in switching power supplies?
Yes, its fast response time and low output noise (0.2Ω impedance) make it an excellent choice for feedback control in switching power supplies, especially in optocoupler-based isolated circuits.
5. What is the minimum operating current requirement for the TL431BQDBZR?
The TL431BQDBZR requires a minimum shunt current of 600 µA for stable operation, ensuring efficient use in low-power circuits without excessive power loss.
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