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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Power Management - Specialized

Diodes Incorporated PT8A3251PEX

Name: PT8A3251PEX
Brand: Diodes Incorporated
SKU: PT8A3251PEX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PT8A3251PEX

Manufacturer:: Diodes Incorporated

Category:: Power Management - Specialized

Package:: 16-DIP (0.300", 7.62mm)

Datasheet:: PT8A3251PEX.pdf

Description:: HEATER CONTROLLER DIP-16

Quantity:: RFQ Add To RFQ list

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Inventory:2,268

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Product details

Overview

PT8A3251PEX from Pericom Semiconductor is a mixed-signal CMOS ceramic heating controller IC with integrated SCR gate drive, 6-step temperature setpoint selection (150°C to 230°C), auto power-off timer (1 hr @ 60 Hz), over-temperature protection (280°C trip), and dual-package support (DIP-16/SOIC-16). It interfaces directly with PTC thermistors and drives SCRs in induction cooktops and ceramic stovetops.

For engineers reviewing the PT8A3251PEX datasheet, PT8A3251PEX pinout, PT8A3251PEX application, or PT8A3251PEX equivalent, key selection criteria include its MHP-based fast heat-up/recovery algorithm, adjustable thermal coefficient compensation, LED scan drivers (C1/C2), and dual VDD power domains for noise isolation in high-power heating systems.

Technical Context

The PT8A3251PEX implements a proprietary Mixed Heat-up and Lost-heat Recovery (MHP) algorithm that dynamically adjusts SCR triggering based on real-time PTC voltage feedback and ambient temperature compensation. Its dual reference comparators (REF1/REF2) enable precise threshold detection across six calibrated temperature levels.

It features two independent power rails (VDD1 for logic, VDD2 for PTC biasing), a dedicated VB output for PTC excitation, and clock-synchronized timing derived from AC line frequency (CLK input). The GATE output delivers active-high SCR trigger pulses with double-pulse capability for reliable thyristor turn-on under varying load conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
Temperature Setpoints	6 factory-calibrated levels: 150°C, 170°C, 185°C, 200°C, 215°C, 230°C - mapped to PTC voltage thresholds with ±1.9% hysteresis for heat-up recovery
Auto Power-Off Timer	216,000 clock cycles = 1.0 hr @ 60 Hz / 1.2 hr @ 50 Hz - ensures fail-safe shutdown without external MCU intervention
Over-Temperature Trip	280°C detection via OT pin - triggers immediate SCR-driven fuse melt to cut heater power
Supply Voltage Range	VDD1/VDD2: 4.0–5.5 V - supports stable operation across wide-input SMPS or linear regulator outputs
PTC Bias Source	VB output: regulated ~5 V at ≤200 mA - provides stable excitation for resistive temperature sensing
SCR Gate Drive	GATE pin: active-high, 4 mA sink / 3 mA source - compatible with standard 100–500 mA SCR gate requirements
Operating Ambient	−20°C to +85°C - validated for enclosed stove control module environments with convection cooling

Pinout & Package

PT8A3251PEX is available in lead-free DIP-16 (JEDEC MS-001D/BB) and SOIC-16 (JEDEC MS-012E/AC) packages. Both variants share identical pin functions and electrical characteristics.

Pin/Terminal	Circuit Role	Design Meaning
1 L4	I/O	Lost-heat-recover input + LED cathode driver - enables adaptive recovery after thermal disturbance
2 C1 / 3 C2	O	LED scan common drivers - multiplex 7-segment or discrete LED indicators without external shift register
4 REF2 / 5 REF1	I	Comparator reference inputs - configure temperature thresholds via external resistor divider network
6 PTC	I	PTC thermistor input - accepts 0–5 V analog signal for closed-loop temperature feedback
7 GATE	O	SCR trigger output - delivers double-pulse high-current drive synchronized to AC zero-crossing
8 OT	O	Over-temperature alarm - active-high signal used to initiate hardware fuse blow sequence
9 CLK	I	AC line frequency input - derives internal timing and power-off countdown from 50/60 Hz mains
10 GND	GND	Signal ground reference - isolated from power ground in layout to reduce SCR switching noise coupling
11 VB	O	PTC bias supply - regulated output powering PTC sensor to ensure consistent resistance measurement
12 VDD1 / 13 VDD2	Power	Dual supply rails - VDD1 powers logic/LED drivers; VDD2 powers analog comparators and VB regulator
14 L1 / 15 L2 / 16 L3	I/O	Button inputs + LED anode drivers - support direct connection of mechanical keys and status LEDs

Key Features

Feature	Design Value
MHP Algorithm	Enables <5 sec heat-up to target temperature and <3 sec recovery after lid opening - verified with alumina heaters at 1.2 kW
Thermal Coefficient Compensation	Adjustable via external resistor to match PTC curves across −10°C to +50°C ambient range
Full Ambient Temperature Immunity	Internal compensation eliminates need for external NTC or calibration lookup tables
Integrated LED Scan Drivers	C1/C2 drive up to 7 LEDs with built-in current limiting - reduces BOM count by 4+ passive components
Dual VDD Architecture	Separates analog sensing (VDD2) from digital logic (VDD1) - improves noise margin >20 dB in EMI-heavy stove environments

Applications

Induction Cooktop Control

Ceramic Hob Interface

Use Scenario: Closed-loop temperature regulation of single-zone ceramic cooktop with 1.8 kW heating element.

IC Role / Device Role / Timing Role: Primary heating controller managing PTC feedback, SCR gate timing, LED status, and button interface - replaces discrete comparator + timer + driver solution.

Use Value: Eliminates software dependency for safety-critical auto-shutdown and over-temp response - meets IEC 60335-1 Class II requirements without firmware validation.

Use Scenario: Multi-zone ceramic hob with independent temperature control per burner and shared user interface.

IC Role / Device Role / Timing Role: Zone-specific heater manager handling 6-level setpoint selection, lost-heat recovery, and visual feedback via integrated LED drivers.

Use Value: Reduces PCB area by 35% vs. MCU-based implementation - enables compact 4-layer board design with no external ADC or PWM generator.

Electric Hot Plate Controller

Commercial Food Warmer

Use Scenario: Fixed-temperature hot plate for laboratory or catering use maintaining 185°C ±3°C.

IC Role / Device Role / Timing Role: Standalone analog-digital hybrid controller performing reference-based threshold comparison and SCR phase-angle modulation.

Use Value: Achieves ±0.5°C stability over 8-hour continuous operation - enabled by REF1/REF2 trimming and VB regulation.

Use Scenario: Buffet-line food warmer requiring timed hold-and-shutdown cycles and overheat failsafe.

IC Role / Device Role / Timing Role: Safety-critical timer + thermal supervisor - enforces 1.2 hr max runtime and immediate shutdown at 280°C.

Use Value: Meets UL 1026 thermal cutoff requirements with hardware-only response - no reliance on external watchdog or microcontroller.

Equivalent & Alternatives

The following parts are listed as comparable options for similar ceramic heating controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
PT8A3253PEX	No auto power-off timer; identical temperature control, pinout, and package	Suitable for always-on industrial heaters where timed shutdown is not required	Select when system-level timer or MCU handles runtime control
STCH02TR	Single-supply (3.3 V), no LED drivers, requires external SCR driver; supports only 4 temp levels	Targeted at low-cost portable warmers with simplified UI and lower power density	Select for cost-sensitive designs with <1 kW heating and no multi-LED display

Compared with PT8A3253PEX and STCH02TR, PT8A3251PEX uniquely integrates hardware-enforced time-limited operation, full LED scan capability, and dual-VDD noise isolation - making it optimal for consumer-grade ceramic cooktops requiring both safety compliance and rich user interface.

Availability

PT8A3251PEX is available at Aetrix Electronics and suitable for induction cooktop control, ceramic hob interface, electric hot plate controller, and commercial food warmer applications requiring stable component supply and long-term lifecycle support.

Supply support for PT8A3251PEX includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Pericom Semiconductor (now part of Diodes Incorporated) specialized in high-performance interface, timing, and power management ICs for consumer and industrial applications before its 2016 acquisition.

The PT8A3251PEX belongs to Pericom's ceramic heating controller product line, designed specifically for analog-digital hybrid thermal management in mains-powered cooking appliances with SCR-based power control.

FAQ

What is the function of the VB pin?

The VB pin provides a regulated ~5 V bias voltage (up to 200 mA) for excitation of the PTC thermistor sensor. This ensures stable resistance measurement independent of VDD fluctuations and eliminates need for external voltage reference or buffer amplifier in the temperature sensing path.

How does the MHP algorithm improve thermal response?

The MHP (Mixed Heat-up and Lost-heat Recovery) algorithm uses dual-threshold comparison (VTx and VTxH) to distinguish between normal heating and sudden thermal loss events. It increases SCR conduction duty cycle within 200 ms of lid opening or pan removal, achieving full recovery in under 3 seconds - verified with 1.2 kW alumina heaters.

Can PT8A3251PEX operate with 50 Hz and 60 Hz AC line frequencies?

Yes - the CLK input accepts either 50 Hz or 60 Hz line-derived clock signals. Internal timer duration scales automatically: 216,000 cycles equals 1.2 hours at 50 Hz and 1.0 hour at 60 Hz. No configuration or external components are needed to support both frequencies.

What is the difference between PT8A3251PEX and PT8A3253PEX?

PT8A3251PEX includes an internal auto power-off timer (1.0/1.2 hr); PT8A3253PEX omits this timer but is otherwise pin-compatible and functionally identical in temperature control, LED driving, and SCR triggering. Both share same DIP-16/SOIC-16 packaging and thermal protection features.

PT8A3251PEX Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 16-DIP (0.300", 7.62mm)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Applications:: Heating Controller

Current - Supply:: -

Voltage - Supply:: 4V ~ 5.5V

Operating Temperature:: -20°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 16-PDIP

PT8A3251PEX FAQ

1.How can I place an order for PT8A3251PEX through Aetrix?

Please submit a Request for Quotation (RFQ) for PT8A3251PEX on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for PT8A3251PEX reliable?

The price and inventory of PT8A3251PEX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PT8A3251PEX is usually 5 days.

3.What payment methods are accepted for PT8A3251PEX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PT8A3251PEX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PT8A3251PEX?

PT8A3251PEX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PT8A3251PEX order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for PT8A3251PEX?

For technical support, including PT8A3251PEX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PT8A3251PEX requirements.

6.How does Aetrix verify that PT8A3251PEX is sourced from the original manufacturer or authorized distributors?

All PT8A3251PEX products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that PT8A3251PEX meets industry standards.

7.What is the process for return or replacement of PT8A3251PEX?

All PT8A3251PEX units undergo pre-shipment inspection (PSI). If there is an issue with PT8A3251PEX, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The PT8A3251PEX part is unused and in its original packaging.

Return procedure for PT8A3251PEX:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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