Overview
The TL431CDMR2, produced by Onsemi, is a three-terminal adjustable shunt regulator. This device operates as a low temperature coefficient zener diode that can be programmed to output voltages between approximately 2.5 V and 36 V using two external resistors. It is part of the TL431 series, known for its thermal stability and wide operating current range, making it suitable for various applications in power management and voltage regulation.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Reference Voltage (Vref) | Approximately 2.5 V | V |
| Programmable Output Voltage Range | 2.5 V to 36 V | V |
| Operating Current Range | 1.0 mA to 100 mA | mA |
| Dynamic Output Impedance | Typically 0.22 Ω | Ω |
| Voltage Reference Tolerance (at 25°C) | ±0.4% (Typical for TL431B) | % |
| Temperature Range | 0°C to 70°C (TL431C), -40°C to 85°C (TL431I), -40°C to 125°C (TL431Q) | °C |
| Output Noise Voltage | Low output noise | - |
| Cathode to Anode Voltage (VKA) | Up to 37 V | V |
| Operating Junction Temperature (TJ) | Up to 150°C | °C |
Key Features
- Programmable output voltage from 2.5 V to 36 V using two external resistors.
- Wide operating current range of 1.0 mA to 100 mA.
- Low dynamic output impedance of typically 0.22 Ω.
- Low output noise voltage.
- Temperature compensated for operation over the full rated operating temperature range.
- Pb-free packages available.
- Excellent replacement for Zener diodes in many applications.
Applications
- On-board regulation and adjustable power supplies.
- Switching power supplies.
- Digital voltmeters and other measurement equipment.
- Op amp circuitry and feedback control circuits.
- Voltage monitoring and constant current sources/sinks.
- Rack server power, industrial AC/DC, AC inverter & VF drives, and servo drive control modules.
- Notebook PC power adapter designs.
Q & A
- What is the TL431CDMR2?
The TL431CDMR2 is a three-terminal adjustable shunt regulator produced by Onsemi.
- What is the programmable output voltage range of the TL431CDMR2?
The output voltage can be set to any value between approximately 2.5 V and 36 V using two external resistors.
- What is the operating current range of the TL431CDMR2?
The device operates within a current range of 1.0 mA to 100 mA.
- What is the typical dynamic output impedance of the TL431CDMR2?
The typical dynamic output impedance is 0.22 Ω.
- What are the temperature ranges for different grades of the TL431?
The TL431C operates from 0°C to 70°C, TL431I from -40°C to 85°C, and TL431Q from -40°C to 125°C.
- What are some common applications of the TL431CDMR2?
Common applications include on-board regulation, adjustable power supplies, switching power supplies, digital voltmeters, and op amp circuitry.
- Can the TL431CDMR2 replace Zener diodes in many applications?
- What is the maximum cathode to anode voltage (VKA) for the TL431CDMR2?
The maximum VKA is up to 37 V.
- Is the TL431CDMR2 available in Pb-free packages?
- What is the operating junction temperature (TJ) limit for the TL431CDMR2?
The operating junction temperature limit is up to 150°C.
