Overview
The TL431ID is a three-terminal adjustable shunt regulator produced by Texas Instruments. This device is part of the TL431 series, known for its high precision and thermal stability across various temperature ranges. The TL431ID is particularly useful in applications requiring adjustable output voltages and high stability, making it an excellent replacement for Zener diodes in many scenarios.
Key Specifications
| Characteristic | Value | Unit |
|---|---|---|
| Reference Voltage Tolerance at 25°C | 0.5% (B grade), 1% (A grade), 2% (Standard grade) | % |
| Adjustable Output Voltage | Vref to 36V | V |
| Operating Temperature Range | −40°C to 125°C | °C |
| Typical Temperature Drift | 6mV (C temp), 14mV (I temp, Q temp) | mV |
| Typical Output Impedance | 0.2Ω | Ω |
| Sink-Current Capability | 1mA to 100mA | mA |
| Package Type | SOIC (D) - 8 pins | |
| Package Quantity | Carrier 75 (Tube), Carrier 2,500 (Large T&R) |
Key Features
- Adjustable output voltage from Vref (approximately 2.5V) to 36V using two external resistors.
- High precision reference voltage with tolerances of 0.5%, 1%, and 2% for B, A, and standard grades, respectively.
- Operation over a wide temperature range from −40°C to 125°C.
- Low output noise and typical output impedance of 0.2Ω.
- Sink-current capability ranging from 1mA to 100mA.
- Active output circuitry providing a sharp turn-on characteristic, making it an excellent replacement for Zener diodes.
Applications
- On-board voltage regulation.
- Adjustable power supplies.
- Switching power supplies.
- Automotive, commercial, and military applications due to its specified thermal stability.
Q & A
- What is the TL431ID used for?
The TL431ID is used as a three-terminal adjustable shunt regulator, often replacing Zener diodes in various applications such as on-board regulation, adjustable power supplies, and switching power supplies.
- What is the adjustable output voltage range of the TL431ID?
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 TL431ID?
The device operates from −40°C to 125°C, with different grades characterized for specific temperature ranges (C, I, Q).
- What are the reference voltage tolerances for the TL431ID?
The reference voltage tolerances are 0.5% (B grade), 1% (A grade), and 2% (Standard grade) at 25°C.
- What is the typical output impedance of the TL431ID?
The typical output impedance is 0.2Ω.
- What is the sink-current capability of the TL431ID?
The sink-current capability ranges from 1mA to 100mA.
- What package types are available for the TL431ID?
The TL431ID is available in SOIC (D) packages with 8 pins.
- How does the TL431ID compare to Zener diodes?
The TL431ID provides a sharp turn-on characteristic and low output noise, making it an excellent replacement for Zener diodes in many applications.
- What are some common applications of the TL431ID?
Common applications include on-board voltage regulation, adjustable power supplies, and switching power supplies, as well as automotive, commercial, and military applications.
- What is the operating junction temperature of the TL431ID?
The operating junction temperature is up to 150°C.
