Overview
The TL431BCDR is a three-terminal adjustable shunt regulator produced by Texas Instruments. It is part of the TL431 series, known for its thermal stability over a wide range of temperatures, making it suitable for automotive, commercial, and military applications. The device allows for adjustable output voltage between 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 power supply and regulation applications.
Key Specifications
| Parameter | Value |
|---|---|
| Package | 8-Pin SOIC (D) |
| Operating Temperature Range | −40°C to 125°C (Q grade) |
| Reference Voltage Tolerance at 25°C | 0.5% (B grade) |
| Adjustable Output Voltage | Vref (approximately 2.5V) to 36V |
| Typical Output Impedance | 0.2Ω |
| Sink-Current Capability | 1mA to 100mA |
| Typical Temperature Drift | 6mV (C temp), 14mV (I temp, Q temp) |
Key Features
- Adjustable output voltage: Vref to 36V with two external resistors
- Low output noise
- Typical output impedance of 0.2Ω
- Sink-current capability: 1mA to 100mA
- Operation from −40°C to 125°C (Q grade)
- Sharp turn-on characteristic, making it a good replacement for Zener diodes
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 TL431BCDR? The TL431BCDR is a three-terminal adjustable shunt regulator produced by Texas Instruments.
- What is the adjustable output voltage range of the TL431BCDR? The output voltage can be set to any value between approximately 2.5V and 36V using two external resistors.
- What are the temperature ranges for the TL431BCDR? The device operates from −40°C to 125°C (Q grade).
- What is the reference voltage tolerance at 25°C for the TL431BCDR? The reference voltage tolerance at 25°C is 0.5% for the B grade.
- What is the typical output impedance of the TL431BCDR? The typical output impedance is 0.2Ω.
- What is the sink-current capability of the TL431BCDR? The sink-current capability ranges from 1mA to 100mA.
- What are some common applications of the TL431BCDR? Common applications include on-board regulation, adjustable power supplies, and switching power supplies.
- Why is the TL431BCDR a good replacement for Zener diodes? It has a sharp turn-on characteristic and low output noise, making it an excellent replacement for Zener diodes in many applications.
- What are the different grades of the TL431 series? The TL431 series is offered in three grades: B (0.5% tolerance), A (1% tolerance), and standard (2% tolerance).
- What is the package type for the TL431BCDR? The TL431BCDR comes in an 8-Pin SOIC (D) package.
