Overview
The TL431BCD is a three-terminal adjustable shunt regulator produced by Texas Instruments. It is part of the TL431 and TL432 family, known for their specified thermal stability over a wide range of temperatures, including automotive, commercial, and military applications. The device allows for adjustable output voltage between the reference voltage (approximately 2.5V) and 36V, using two external resistors. This feature, along with its sharp turn-on characteristic, makes it an excellent replacement for Zener diodes in various applications.
Key Specifications
| Parameter | Value |
|---|---|
| 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 |
| Operating Temperature Range | −40°C to 125°C (TL43xxQ), −40°C to 85°C (TL43xxI), 0°C to 70°C (TL43xxC) |
| Typical Temperature Drift | 6mV (C temp), 14mV (I temp, Q temp) |
| Output Impedance | 0.2Ω (typical) |
| Sink-Current Capability | 1mA to 100mA |
| Package | SOIC (D) with 8 pins |
Key Features
- Adjustable output voltage settable between Vref (approximately 2.5V) and 36V using two external resistors.
- 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.
- Low output drift versus temperature, ensuring good stability over the entire temperature range.
- Available in three grades with different initial tolerances at 25°C: 0.5% (B grade), 1% (A grade), and 2% (Standard grade).
Applications
- On-board regulation.
- Adjustable power supplies.
- Switching power supplies.
- Replacement for Zener diodes in various applications.
- Automotive, commercial, and military temperature ranges.
Q & A
- What is the TL431BCD?
The TL431BCD is a three-terminal adjustable shunt regulator produced by Texas Instruments.
- What is the adjustable output voltage range of the TL431BCD?
The output voltage can be set to any value between Vref (approximately 2.5V) and 36V using two external resistors.
- What are the operating temperature ranges for the TL431BCD?
The device operates from −40°C to 125°C (TL43xxQ), −40°C to 85°C (TL43xxI), and 0°C to 70°C (TL43xxC).
- What is the typical output impedance of the TL431BCD?
The typical output impedance is 0.2Ω.
- What is the sink-current capability of the TL431BCD?
The sink-current capability ranges from 1mA to 100mA.
- What are the key applications of the TL431BCD?
Key applications include on-board regulation, adjustable power supplies, switching power supplies, and as a replacement for Zener diodes.
- How does the TL431BCD compare to Zener diodes?
The TL431BCD has a sharp turn-on characteristic, making it an excellent replacement for Zener diodes in many applications.
- What are the different grades of the TL431BCD?
The device is available in three grades with initial tolerances at 25°C: 0.5% (B grade), 1% (A grade), and 2% (Standard grade).
- What is the typical temperature drift of the TL431BCD?
The typical temperature drift is 6mV (C temp) and 14mV (I temp, Q temp).
- What package options are available for the TL431BCD?
The device is available in an SOIC (D) package with 8 pins.
