Diodes Incorporated
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PT8A3252 (Obsolete)

5LED Ceramic Heating Controller

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Product Description

The PT8A3252/54 is specially designed for ceramic heating control with 5 internal level of 130°C, 145°C, 160°C, 175°C, 190°C. And the temperature range can be adjusted from 100°C to 250°C by external series resistance. It can drive SCR directly and detect heater temperature by heater-self without extra temperature sensor. It has 3 keys for function setting, 5 LEDs for working status indication. The PT8A3252 has an internal timer; it timeouts and device will stop heating automatically after 216000 clock period, ie. 1 hour for 60Hz and 1.2 hour for 50Hz. The circuit of Over-Heat Protection will be working for safety when heater temperature reached to 250°C. The chip is packaged in lead free DIP-16 and SOIC-16.


  • Pulse trigger with high current for SCR
  • Quickly Heating-Up and Quickly Lost-HeatRecover
  • External Adjustable to fit wide range heating plates
  • External Adjustable to different TCR of sensors
  • Full temperature compensation and insensitive to environment temperature
  • 5 Heat Temperature Settings
  • Auto power off (only for PT8A3252)
  • Over Temperature protection
  • DIP-16 and SOIC-16 packages


  • Ceramic Heating Controller
  • High watt density Alumina Heaters 

Product Specifications

Product Parameters

Heating Element MCH
LED @ Heater On Remark
Auto Off Yes
On/Off Key Three Keys (ON & OFF Key, Up/Down Key)
Driver Type SCR

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Technical Documents

Recommended Soldering Techniques


Additional Technical Documents are available upon request:
Application information, Evaluation board, and Other technical documents

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Product Change Notices (PCNs)

A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

PCN # Issue Date Implementation Date Subject
PCN-2602 2023-01-31 2023-07-31 Device End of Life (EOL)