Overview
The TL431QDBZR is a three-terminal adjustable shunt regulator produced by Texas Instruments. This device is part of the TL431 family, known for its specified thermal stability over a wide range of temperatures, making it suitable for automotive, commercial, and military applications. The TL431QDBZR operates from -40°C to 125°C and features an adjustable output voltage that can be set between the reference voltage (approximately 2.5V) and 36V using two external resistors. Its active output circuitry provides a sharp turn-on characteristic, making it an excellent replacement for Zener diodes in various applications.
Key Specifications
| Parameter | Value |
|---|---|
| Package | SOT-23 (DBZ), 3 pins |
| Operating Temperature Range | -40°C to 125°C |
| Reference Voltage Tolerance at 25°C | 2% (Standard grade) |
| Adjustable Output Voltage | Vref (approximately 2.5V) to 36V |
| Typical Temperature Drift | 6mV (C temp), 14mV (I temp, Q temp) |
| Output Impedance | 0.2Ω (typical) |
| Sink-Current Capability | 1mA to 100mA |
| Minimum Cathode Current | 0.4 mA to 1 mA |
| Off-State Current | 0.1 μA to 1 μA |
Key Features
- Adjustable output voltage from Vref (approximately 2.5V) to 36V using two external resistors.
- Operation from -40°C to 125°C, ensuring stability over a wide temperature range.
- Low output noise and typical output impedance of 0.2Ω.
- Sink-current capability ranging from 1mA to 100mA.
- Sharp turn-on characteristic, making it a suitable replacement for Zener diodes.
- Available in three grades with initial tolerances of 0.5%, 1%, and 2% at 25°C.
Applications
- On-board regulation.
- Adjustable power supplies.
- Switching power supplies.
- Automotive, commercial, and military applications due to its thermal stability.
Q & A
- What is the operating temperature range of the TL431QDBZR?
The TL431QDBZR operates from -40°C to 125°C.
- How is the output voltage of the TL431QDBZR adjusted?
The output voltage can be adjusted using two external resistors and can be set between the reference voltage (approximately 2.5V) and 36V.
- What are the different grades of the TL431QDBZR based on reference voltage tolerance?
The TL431QDBZR is available in three grades with initial tolerances of 0.5%, 1%, and 2% at 25°C, designated as B, A, and standard grades, respectively.
- What is the typical output impedance of the TL431QDBZR?
The typical output impedance is 0.2Ω.
- What is the sink-current capability of the TL431QDBZR?
The sink-current capability ranges from 1mA to 100mA.
- Can the TL431QDBZR replace Zener diodes in some applications?
- What are some common applications of the TL431QDBZR?
- What is the minimum cathode current for the TL431QDBZR?
The minimum cathode current is between 0.4 mA and 1 mA.
- What is the off-state current of the TL431QDBZR?
The off-state current is between 0.1 μA and 1 μA.
- What is the package type and pin count of the TL431QDBZR?
The TL431QDBZR comes in an SOT-23 (DBZ) package with 3 pins.
