Overview
The TL431ACPKG3 is a three-terminal adjustable shunt regulator produced by Texas Instruments. It is part of the TL431 and TL432 series, known for their specified thermal stability across various temperature ranges, including automotive, commercial, and military applications. The device allows for adjustable output voltage settings between the reference voltage (approximately 2.5V) and 36V using two external resistors. This makes it an excellent replacement for Zener diodes in many applications, such as on-board regulation, adjustable power supplies, and switching power supplies.
Key Specifications
| Parameter | 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 (Q grade), −40°C to 85°C (I grade), 0°C to 70°C (C grade) | °C |
| Typical Temperature Drift | 6 mV (C temp), 14 mV (I temp, Q temp) | mV |
| Typical Output Impedance | 0.2 Ω | Ω |
| Sink-Current Capability | 1 mA to 100 mA | mA |
| Package Types | SOT-23-3, SOT-23-5, SOIC, PDIP, SOP, SOT-89 |
Key Features
- Reference voltage tolerance at 25°C: 0.5% (B grade), 1% (A grade), 2% (Standard grade)
- Adjustable output voltage: Vref to 36V
- Operation from −40°C to 125°C (Q grade), −40°C to 85°C (I grade), and 0°C to 70°C (C grade)
- Low output noise and typical output impedance of 0.2 Ω
- Sink-current capability: 1 mA to 100 mA
- Active output circuitry with a sharp turn-on characteristic, making it an excellent replacement for Zener diodes
Applications
- Adjustable voltage and current referencing
- On-board regulation
- Adjustable power supplies
- Switching power supplies
- Rack server power
- Industrial AC/DC power supplies
- AC inverter & VF drives
- Servo drive control modules
- Notebook PC power adapter design
Q & A
- What is the TL431ACPKG3?
The TL431ACPKG3 is a three-terminal adjustable shunt regulator produced by Texas Instruments.
- What are the reference voltage tolerances for the TL431ACPKG3?
The reference voltage tolerances are 0.5% (B grade), 1% (A grade), and 2% (Standard grade) at 25°C.
- What is the adjustable output voltage range of the TL431ACPKG3?
The adjustable output voltage range is from Vref (approximately 2.5V) to 36V.
- What are the operating temperature ranges for the TL431ACPKG3?
The operating temperature ranges are −40°C to 125°C (Q grade), −40°C to 85°C (I grade), and 0°C to 70°C (C grade).
- What is the typical output impedance of the TL431ACPKG3?
The typical output impedance is 0.2 Ω.
- What is the sink-current capability of the TL431ACPKG3?
The sink-current capability is from 1 mA to 100 mA.
- What are some common applications of the TL431ACPKG3?
Common applications include on-board regulation, adjustable power supplies, switching power supplies, rack server power, industrial AC/DC power supplies, AC inverter & VF drives, servo drive control modules, and notebook PC power adapter design.
- What packages are available for the TL431ACPKG3?
The device is available in various packages including SOT-23-3, SOT-23-5, SOIC, PDIP, SOP, and SOT-89.
- Why is the TL431ACPKG3 a good replacement for Zener diodes?
The TL431ACPKG3 has active output circuitry with a sharp turn-on characteristic, making it an excellent replacement for Zener diodes in many applications.
- What is the typical temperature drift of the TL431ACPKG3?
The typical temperature drift is 6 mV (C temp) and 14 mV (I temp, Q temp).
