TL432AIDBZR T4A3 Three-terminal Adjustable Shunt Regulator
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TL432AIDBZR T4A3 Adjustable Shunt Regulator for ASIC Hashboards
The TL432AIDBZR (on-package marking T4A3) is a three-terminal adjustable shunt regulator with strong thermal stability and active output circuitry. With its adjustable output range from Vref (approximately 2.5V) up to 36V using just two external resistors, it is the standard precision reference part for feedback loops on ASIC hashboards, isolated supplies and switching converters.
A wide operating temperature range of -40°C to +125°C, typical output impedance of 0.2Ω and sink-current capability from 1mA to 100mA make it well suited to the noisy, thermally demanding environment of crypto mining hardware.
Specifications
| Parameter | Value |
|---|---|
| Part number | TL432AIDBZR |
| On-package marking | T4A3 |
| Condition | New |
| Function | Three-terminal adjustable shunt regulator |
| Reference voltage (Vref) | ~2.5V |
| Output voltage range | Vref to 36V (set with two external resistors) |
| Sink current | 1mA to 100mA |
| Typical output impedance | 0.2Ω |
| Operating temperature | -40°C to +125°C |
| Output noise | Low |
| Application | Onboard regulation, adjustable / switching power supplies, ASIC hashboards |
Where the TL432A sits on a hashboard
The TL432A is the precision reference inside the secondary feedback loop of many ASIC PSU sections and on the auxiliary regulation found on hashboards. Its adjustable output and active circuitry keep the regulated rail tied to a stable 2.5V Vref, even as load and temperature shift. When it drifts or fails, the regulated rail wanders or fails to start.
Compatibility
Drop-in replacement for the TL432AIDBZR / T4A3 socket on ASIC hashboards and PSU repair benches that already specify the part. Confirm the package marking and pin-out on the existing part before fitting.
Common failure symptoms
- Feedback rail drifts away from the target voltage
- Output noise increases — downstream rail no longer regulated tightly
- Sink-current path stays at zero — regulator never closes the loop
- PSU or hashboard rail fails to start because the feedback reference is missing
- Visible burn or cracked package near the T4A3 marking
Frequently asked questions
Is T4A3 the same part as TL432A?
Yes — T4A3 is the on-package marking for TL432A in this SC-70 / SOT-23 family.
How do I set the output voltage?
Use two external resistors in a voltage divider from the regulated rail to ground, with the centre tap into the REF pin. The regulated voltage is Vref x (1 + R1/R2), where Vref ≈ 2.5V.
What is the maximum cathode current?
Sink-current capability is 1mA to 100mA. For higher current, drive an external pass transistor from the TL432A output.
Do you stock matching LDOs and references?
Yes — we carry SPX5205M5, LP3986-18B3F and other precision regulators.
Related products
- SPX5205M5 5.0V LDO Regulator SOT-23-5
- LP3986-18B3F 1.8V Ultra-Low-Noise LDO
- SN7805D 5V Three-Terminal Regulator
- MT1470 AS037Z 2A Step-Down Converter
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