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STMicroelectronics T435-700H
- Part No.:
- T435-700H
- Manufacturer:
- STMicroelectronics
- Category:
- TRIACs
- Package:
- TO-251-3 Short Leads, IPAK, TO-251AA
- Datasheet:
-
T435-700H.pdf
- Description:
- TRIAC ALTERNISTOR 700V 4A IPAK
- Quantity:
- Payment:
- Shipping:
Inventory:5,903
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Product details
Overview
T435-700H from STMicroelectronics is a 4 A, 700 V snubberless triac in IPAK package, designed for robust AC phase control in inductive loads. It features 35 mA maximum gate trigger current (IGT), 400 V/µs minimum dV/dt immunity at 125 °C, and 50 A/µs critical dI/dt rating - enabling reliable commutation in universal motor drives and kitchen appliance power stages.
For engineers reviewing the T435-700H datasheet, T435-700H pinout, T435-700H application, or T435-700H equivalent, key selection criteria include snubberless operation for reduced BOM count, high junction temperature capability (125 °C), thermal resistance of 70 °C/W (IPAK, FR4 PCB), and compatibility with logic-level gate drive circuits.
Technical Context
The T435-700H is a three-quadrant triac leveraging ST's Snubberless technology to eliminate external snubber networks in AC inductive switching. Its gate trigger sensitivity is optimized for direct microcontroller interface without buffer stages, with IGT ≤ 35 mA across all quadrants and VGT ≤ 1.3 V.
It delivers high commutation robustness via 400 V/µs dV/dt immunity at elevated junction temperature (125 °C) and supports surge currents up to 31 A (60 Hz, 16.7 ms). The device operates with on-state voltage drop ≤ 1.56 V at 5.5 A and dynamic resistance ≤ 120 mΩ at 125 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IT(rms) | 4 A - Continuous RMS load current handling for motor and solenoid drivers without forced cooling. |
| VDRM / VRRM | 700 V - Peak repetitive blocking voltage enabling use in 230 VAC mains applications with margin. |
| IGT (max) | 35 mA - Gate trigger current threshold allowing direct drive from GPIO or low-power logic outputs. |
| dV/dt (min) | 400 V/µs at Tj = 125 °C - High noise immunity prevents false triggering in noisy inductive environments. |
| Rth(j-a) | 70 °C/W on FR4 PCB (35 µm Cu, S = 0.5 cm²) - Enables thermal design without heatsink for low-duty-cycle appliances. |
| VTM (max) | 1.56 V at ITM = 5.5 A - Low conduction loss reduces power dissipation and improves efficiency in compact designs. |
| I²t (fusing) | 5.1 A²s (tp = 10 ms) - Supports short-circuit withstand time for overcurrent protection coordination. |
Pinout & Package
Package: IPAK (TO-251AA equivalent), insulated tab, lead-free, halogen-free epoxy molding (UL94 V0).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 (MT1) | Main Terminal 1 | Reference terminal for gate trigger; connected to load return path in standard phase-control topology. |
| A2 (MT2) | Main Terminal 2 | High-side AC line connection; carries full load current and defines polarity reference for gate triggering. |
| G | Gate | Control input accepting positive or negative pulses in quadrants I, II, and III; no snubber required due to intrinsic dV/dt immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Snubberless operation | Eliminates external RC snubber components, reducing board space and BOM cost in AC motor control. |
| Logic-level gate drive | IGT ≤ 35 mA enables direct interface with 3.3 V/5 V microcontrollers without gate driver ICs. |
| Three-quadrant triggering | Supports gate triggering in quadrants I, II, and III - simplifies control circuitry vs. four-quadrant devices. |
| High-temperature reliability | Rated for 125 °C junction operation with guaranteed dV/dt and IGT performance at full temperature range. |
| Low thermal resistance (IPAK) | Rth(j-c) = 2.6 °C/W allows efficient heat transfer to heatsink or metal-core PCB in high-power density layouts. |
Applications
| Universal Motor Control | Kitchen Appliance Power Stage |
|---|---|
|
Use Scenario: Speed regulation of vacuum cleaners, blenders, and power drills using phase-angle control. IC Role / Device Role / Timing Role: Main AC power switch controlling RMS voltage delivered to series-wound universal motor. Use Value: Snubberless architecture eliminates snubber losses and component count, improving system efficiency and reliability under variable-speed load transients. |
Use Scenario: Heating element and motor control in dishwashers and coffee makers. IC Role / Device Role / Timing Role: Zero-crossing or phase-controlled AC switching for resistive heating and pump motors. Use Value: 400 V/µs dV/dt immunity prevents false turn-on during inductive kickback from solenoid valves and pump windings. |
| Electrovalve Actuation | Power Tool Trigger Circuit |
|
Use Scenario: On/off control of 230 VAC solenoid valves in HVAC and irrigation systems. IC Role / Device Role / Timing Role: Solid-state replacement for mechanical relays, driven by microcontroller PWM or logic signals. Use Value: 35 mA IGT and 1.3 V VGT ensure compatibility with standard logic-level outputs, reducing need for discrete level-shifting. |
Use Scenario: Variable-speed trigger control in corded electric saws and sanders. IC Role / Device Role / Timing Role: Phase-controlled AC switch modulating power to universal motor based on user-triggered potentiometer input. Use Value: 30 A non-repetitive surge rating supports startup inrush current of high-inertia motors without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triac-based AC switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BT139-700 | 4 A, 700 V, 50 mA IGT max, TO-220 package, no snubberless rating | Requires external snubber network for inductive loads; higher gate drive requirement | Preferred where cost is prioritized over board space and gate drive simplicity |
| T435-700T | Same electrical specs, TO-220AB package, Rth(j-c) = 2.6 °C/W, insulated tab option available | Better thermal performance with heatsink mounting; larger footprint than IPAK | Chosen when higher power dissipation or legacy TO-220 layout compatibility is required |
Compared with BT139-700, the T435-700H offers lower gate drive burden and snubberless operation for cleaner layout; versus T435-700T, it provides identical electrical performance in a smaller IPAK footprint ideal for space-constrained PCBs.
Availability
T435-700H is available at Aetrix Electronics and suitable for universal motor control, kitchen appliance power stages, electrovalve actuation, and power tool trigger circuits requiring stable component supply and long-term industrial availability.
Supply support for T435-700H 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in power, analog, MEMS, and microcontroller technologies for industrial, automotive, and consumer markets.
The T4 series triacs are part of ST's high-reliability AC power switching portfolio, engineered specifically for snubberless operation in inductive AC loads - targeting cost-sensitive, high-volume appliance and motor control applications.
FAQ
What is the maximum junction temperature for continuous operation of the T435-700H?
The T435-700H is rated for continuous operation up to 125 °C junction temperature, with all key parameters-including IGT, dV/dt, and VTM-guaranteed across this full range per Table 3 and Table 4 of the official datasheet (DocID7699 Rev 9).
Does the T435-700H require a heatsink in typical appliance applications?
A heatsink is not required for continuous 4 A RMS operation if mounted on a 0.5 cm² copper area (35 µm thick) on FR4 PCB, as Rth(j-a) = 70 °C/W yields ~28 °C rise above ambient at 1 W dissipation. Heatsinking becomes necessary only above 2–3 A RMS in enclosed, still-air environments.
Can the T435-700H be triggered using zero-crossing detection circuits?
Yes - the T435-700H supports both phase-angle and zero-crossing triggering modes. Its three-quadrant structure allows gate triggering with either polarity relative to MT1, making it compatible with standard opto-triac zero-crossing drivers like MOC3041 or IL420.
Is the IPAK package of the T435-700H lead-free and RoHS compliant?
Yes - the T435-700H uses a lead-free, halogen-free epoxy molding compound meeting UL94 V0 and RoHS Directive 2011/65/EU requirements, as confirmed in Section 2 ("Package information") and ECOPACK® documentation referenced in the datasheet.
T435-700H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- Snubberless™
- Package/Case:
- TO-251-3 Short Leads, IPAK, TO-251AA
- Packaging:
- Tube
- Product Status:
- Obsolete
- Triac Type:
- Alternistor - Snubberless
- Voltage - Off State:
- 700 V
- Current - On State (It (RMS)) (Max):
- 4 A
- Voltage - Gate Trigger (Vgt) (Max):
- 1.3 V
- Current - Non Rep. Surge 50, 60Hz (Itsm):
- 30A, 31A
- Current - Gate Trigger (Igt) (Max):
- 35 mA
- Current - Hold (Ih) (Max):
- 35 mA
- Configuration:
- Single
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- IPAK
T435-700H FAQ
1.How can I place an order for T435-700H through Aetrix?
Please submit a Request for Quotation (RFQ) for T435-700H 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 T435-700H reliable?
The price and inventory of T435-700H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for T435-700H is usually 5 days.
3.What payment methods are accepted for T435-700H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for T435-700H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for T435-700H?
T435-700H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your T435-700H 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 T435-700H?
For technical support, including T435-700H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your T435-700H requirements.
6.How does Aetrix verify that T435-700H is sourced from the original manufacturer or authorized distributors?
All T435-700H 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 T435-700H meets industry standards.
7.What is the process for return or replacement of T435-700H?
All T435-700H units undergo pre-shipment inspection (PSI). If there is an issue with T435-700H, 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 T435-700H part is unused and in its original packaging.
Return procedure for T435-700H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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