Overview
The TL431CDR is a three-terminal adjustable shunt regulator produced by Texas Instruments. It is part of the TL431 series, known for its high precision and adjustable output voltage. This device is designed to provide specified thermal stability over a wide range of temperatures, making it suitable for automotive, commercial, and military applications. The TL431CDR offers 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-SOIC (0.154, 3.90mm Width) |
| Number of Pins | 8 |
| Operating Temperature Range (°C) | 0 to 70 |
| Reference Voltage Tolerance at 25°C | 0.5% (B grade), 1% (A grade), 2% (Standard 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 from Vref (approximately 2.5V) to 36V using two external resistors.
- Operation from −40°C to 125°C, with specific temperature ranges for different grades (C: 0°C to 70°C, I: −40°C to 85°C, Q: −40°C to 125°C).
- Low output noise and typical output impedance of 0.2Ω.
- Sink-current capability from 1mA to 100mA.
- Sharp turn-on characteristic, making it an excellent replacement for Zener diodes.
- Available in three grades with initial tolerances of 0.5%, 1%, and 2% at 25°C.
Applications
- On-board voltage regulation.
- Adjustable power supplies.
- Switching power supplies.
- Replacement for Zener diodes in various applications.
- Automotive, commercial, and military applications due to its specified thermal stability.
Q & A
- What is the TL431CDR used for?
The TL431CDR is used as a three-terminal adjustable shunt regulator, suitable for on-board regulation, adjustable power supplies, and switching power supplies.
- What is the adjustable output voltage range of the TL431CDR?
The output voltage can be set to any value between Vref (approximately 2.5V) and 36V using two external resistors.
- What are the temperature ranges for the TL431CDR?
The device operates from −40°C to 125°C, with specific grades characterized for different temperature ranges: C (0°C to 70°C), I (−40°C to 85°C), and Q (−40°C to 125°C).
- What is the typical output impedance of the TL431CDR?
The typical output impedance is 0.2Ω.
- What is the sink-current capability of the TL431CDR?
The sink-current capability ranges from 1mA to 100mA.
- What are the initial tolerance grades available for the TL431CDR?
The device is available in three grades with initial tolerances of 0.5% (B grade), 1% (A grade), and 2% (Standard grade) at 25°C.
- Can the TL431CDR replace Zener diodes?
Yes, the TL431CDR provides a sharp turn-on characteristic, making it an excellent replacement for Zener diodes in many applications.
- What is the package type of the TL431CDR?
The TL431CDR is packaged in an 8-SOIC (0.154, 3.90mm Width) package.
- What are some common applications of the TL431CDR?
Common applications include on-board voltage regulation, adjustable power supplies, switching power supplies, and replacement for Zener diodes.
- Is the TL431CDR suitable for automotive applications?
Yes, the TL431CDR is suitable for automotive applications due to its specified thermal stability over applicable temperature ranges.
