My Inquiry
My Account
Diodes Incorporated PT8A3245WEX
- Part No.:
- PT8A3245WEX
- Manufacturer:
- Diodes Incorporated
- Category:
- Power Management - Specialized
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
PT8A3245WEX.pdf
- Description:
- HEATER CONTROLLER SO-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,021
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
PT8A3245WEX from Pericom Semiconductor is a mixed-signal CMOS heating controller IC designed for single-key auto-heating appliances with NTC-based temperature sensing and SCR gate drive. It supports dual-line voltage (120V/240V), implements NTC open-circuit protection, delivers constant LED indication during heating, and features a 1-hour auto-shutoff timer at 60 Hz. Used in hair curlers for precise thermal control.
For engineers reviewing the PT8A3245WEX datasheet, PT8A3245WEX pinout, PT8A3245WEX application, or PT8A3245WEX equivalent, key selection criteria include NTC input thresholds (VNTC0 = 0.385×VCC), GATE output current (2.5 mA sink), SOIC-8 package compatibility, and single-key ON/OFF + LED2 drive functionality.
Technical Context
The PT8A3245WEX integrates a 2-bit ADC for NTC voltage sampling, internal clock synchronization to AC line frequency (50/60 Hz), and state-machine logic for heating-on/off transitions. Its reset behavior initiates on power-up, and it enters heating-off state after timer timeout (216,000 CLK cycles) or button press.
It drives an external SCR via active-high GATE output and provides bidirectional LED control: Pin 5 (ON/OFF) sources current for LED1 during heating, while Pin 7 (OFF) sinks current for LED2 - always inverse to LED1. NTC open detection uses differential monitoring between Pins 1 (NTC1, input) and 2 (NTC2, output).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.5–5.5 V - powers internal logic and I/O buffers without external regulation |
| CLK Input Frequency | 50/60 Hz - synchronizes timing and power-phase control to AC mains |
| Auto-Off Timer | 1.2 h @ 50 Hz / 1.0 h @ 60 Hz - ensures safe thermal duty cycling in consumer appliances |
| GATE Output Sink Current | 2.5 mA - directly triggers standard low-gate-charge SCRs without buffer stage |
| VNTC Thresholds | VNTC0 = 0.385×VCC, VNTC1 = 0.385×VCC, VNTC2 = 0.40×VCC - defines three NTC resistance bands for proportional heating control |
| NTC Open Detection | Dual-pin (NTC1/NTC2) comparator circuit - disables GATE and flashes LED2 at 1/8 CLK if NTC opens |
| Operating Temperature | −20 °C to +85 °C - validated for enclosed handheld appliance environments |
Pinout & Package
PT8A3245WEX is supplied in a lead-free, RoHS-compliant SOIC-8 package (JEDEC MS-012E/AA), 4.7–5.1 mm wide, 3.8–4.0 mm body width, 1.27 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NTC1) | Analog input | NTC voltage sensing node; used with Pin 2 for open-circuit detection and temperature band decoding |
| 2 (NTC2) | Analog output | Reference signal for NTC open detection; pulled low when NTC fails open |
| 3 (CLK) | Digital input | AC line zero-crossing sync input; sets internal timer base and phase control timing |
| 4 (GND) | Power reference | Common ground for analog/digital sections and SCR gate return path |
| 5 (ON/OFF) | I/O bidirectional | Single-key input for heating start/stop; also drives LED1 anode during heating |
| 6 (GATE) | Digital output | Active-high SCR trigger output; 2.5 mA sink capability enables direct drive of MOC3021/MOC3041 |
| 7 (LED) | Output | Sinks current for LED2 cathode; inverse blinking pattern to LED1 for status differentiation |
| 8 (VDD) | Power supply | 3.5–5.5 V CMOS core supply; decoupling capacitor required per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Dual-voltage line adaptation | Automatically scales heating power based on 50/60 Hz CLK amplitude - prevents overheating on 120V vs 240V mains |
| NTC open-fault safety | Disables GATE and activates LED2 flash (1/8 CLK) within one cycle - eliminates uncontrolled heating risk |
| Constant LED indication | Steady illumination on Pin 5 during heating (vs flash modes in PT8A3240/2/4/6) - improves user feedback clarity |
| Single-key operation mode | Combines ON and OFF functions on Pin 5 - reduces BOM count and PCB footprint vs two-button variants |
| Integrated 2-bit ADC | Digitizes NTC voltage into 3 discrete bands (VNTC0–VNTC2) - enables coarse but robust closed-loop thermal regulation |
Applications
| Hair Curler | Flat Iron |
|---|---|
Use Scenario: Handheld styling tool requiring precise, time-limited heating cycles and user-observable status feedback. IC Role / Device Role / Timing Role: Primary thermal controller managing SCR gate timing, NTC-based temperature banding, and dual-LED user interface. Use Value: Enables 1-hour auto-shutoff and NTC open protection - meets IEC 60335-1 safety requirements for Class II portable appliances. | Use Scenario: Dual-plate heating appliance needing synchronized power delivery across both plates with fail-safe shutdown. IC Role / Device Role / Timing Role: Central timing and power-control unit coordinating SCR firing phase and thermal response across parallel heating elements. Use Value: Single-key ON/OFF + constant LED simplifies UI design while maintaining compliance with UL 859 thermal cutoff mandates. |
| Heat Gun | Curling Wand |
Use Scenario: High-airflow thermal tool where rapid heat-up and overtemperature prevention are critical. IC Role / Device Role / Timing Role: Line-synchronized heater driver with adaptive power scaling - adjusts SCR conduction angle based on detected mains voltage. Use Value: Prevents element burnout on 120V supply by reducing effective duty cycle - extends heater life and avoids warranty claims. | Use Scenario: Compact, battery-assisted or low-power corded wand requiring minimal external components and low quiescent current. IC Role / Device Role / Timing Role: Low-pin-count thermal manager integrating sensing, timing, drive, and visual feedback in one SOIC-8 IC. Use Value: 250 µA typical ICC at VDD = 5 V allows use with small-capacity power supplies - reduces transformer size and cost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar heating controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PT8A3241WEX | Same SOIC-8 package and pinout; differs only in LED behavior (constant-on vs PT8A3245's constant-on) and dual-key support | Requires separate ON and OFF buttons; not suitable for single-key designs | Select PT8A3241WEX only when mechanical layout accommodates two tactile switches and distinct LED1/LED2 polarity is needed |
| PT8A3246WEX | Identical functional block; differs in LED mode (flash vs constant) and absence of auto-off timer enable | Lacks 1-hour auto-shutoff - requires external timer or firmware supervision | Choose PT8A3246WEX only for applications where continuous heating is permitted and safety standards allow manual-only shutdown |
Compared with PT8A3241WEX and PT8A3246WEX, PT8A3245WEX uniquely combines single-key operation, constant LED indication, and guaranteed 1-hour auto-off - making it optimal for UL/CE-certified consumer hair tools requiring minimal BOM and intrinsic safety.
Availability
PT8A3245WEX is available at Aetrix Electronics and suitable for hair curlers, flat irons, heat guns, and curling wands requiring stable component supply, RoHS-compliant packaging, and production-ready thermal control ICs.
Supply support for PT8A3245WEX 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 electronics before its 2016 acquisition.
The PT8A324x series was developed specifically for cost-sensitive, safety-critical AC-heated personal care appliances - integrating sensing, timing, drive, and UI in minimal pin count and SOIC/DIP packages.
FAQ
What is the function of Pin 2 (NTC2) on PT8A3245WEX?
Pin 2 (NTC2) is an analog output used exclusively for NTC open-circuit detection. When the NTC sensor fails open, Pin 2 pulls low, disabling the GATE output and triggering LED2 to flash at 1/8 CLK frequency. It does not provide temperature measurement data - that role belongs solely to Pin 1 (NTC1).
Can PT8A3245WEX drive an MOC3041 opto-TRIAC directly?
Yes. With a 2.5 mA sink capability on Pin 6 (GATE) and VDD = 5.0 V, PT8A3245WEX meets the 15 mA minimum LED forward current requirement of the MOC3041 when used with a 220 Ω series resistor (IF ≈ 18.2 mA). Layout must maintain < 10 cm trace length between GATE and opto-TRIAC anode.
How does PT8A3245WEX adapt to 120V vs 240V mains without configuration?
It senses RMS amplitude of the 50/60 Hz CLK input signal. At 120V, CLK amplitude is lower, causing the internal logic to reduce SCR conduction angle - delivering less average power. At 240V, higher CLK amplitude increases conduction angle. This automatic scaling occurs without external resistors or firmware changes.
Is there a recommended decoupling capacitor for VDD (Pin 8)?
A 1.0 µF X5R ceramic capacitor placed within 3 mm of Pin 8 and GND (Pin 4) is specified in the application circuit. This suppresses switching noise from GATE output and stabilizes the internal 2-bit ADC reference - ensuring consistent NTC threshold detection across temperature and voltage ranges.
PT8A3245WEX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Applications:
- Heating Controller
- Current - Supply:
- -
- Voltage - Supply:
- 3.5V ~ 5.5V
- Operating Temperature:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
PT8A3245WEX FAQ
1.How can I place an order for PT8A3245WEX through Aetrix?
Please submit a Request for Quotation (RFQ) for PT8A3245WEX 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 PT8A3245WEX reliable?
The price and inventory of PT8A3245WEX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PT8A3245WEX is usually 5 days.
3.What payment methods are accepted for PT8A3245WEX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PT8A3245WEX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PT8A3245WEX?
PT8A3245WEX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PT8A3245WEX 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 PT8A3245WEX?
For technical support, including PT8A3245WEX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PT8A3245WEX requirements.
6.How does Aetrix verify that PT8A3245WEX is sourced from the original manufacturer or authorized distributors?
All PT8A3245WEX 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 PT8A3245WEX meets industry standards.
7.What is the process for return or replacement of PT8A3245WEX?
All PT8A3245WEX units undergo pre-shipment inspection (PSI). If there is an issue with PT8A3245WEX, 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 PT8A3245WEX part is unused and in its original packaging.
Return procedure for PT8A3245WEX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PT8A3245WEX Tags
-
TPS2511DGNR
Texas Instruments
-
UTC2000/MG
Microchip Technology
-
TUSB320HAIRWBR
Texas Instruments
-
TPS61252DSGR
Texas Instruments
-
PI5USB30216CXUAEX
Diodes Incorporated
-
SN6501DBVR
Texas Instruments
-
CYPD3177-24LQXQT
Infineon Technologies
-
SN6501QDBVRQ1
Texas Instruments
-
STUSB1600AQTR
STMicroelectronics
-
SN6505BDBVR
Texas Instruments
-
SN6501DBVT
Texas Instruments
-
TPS65150PWPR
Texas Instruments
Tech Hub
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
