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STMicroelectronics T435-700B-TR
- Part No.:
- T435-700B-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TRIACs
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
T435-700B-TR.pdf
- Description:
- TRIAC ALTERNISTOR 700V 4A DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:95
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Product details
Overview
T435-700B-TR from STMicroelectronics is a 4 A, 700 V snubberless triac in DPAK package, designed for AC phase control in inductive loads. It features 35 mA maximum gate trigger current (IGT), 400 V/µs 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 T435-700B-TR datasheet, T435-700B-TR pinout, T435-700B-TR application, or T435-700B-TR equivalent, key selection criteria include snubberless operation, 700 V blocking voltage, DPAK thermal resistance (70 °C/W), and compatibility with logic-level gate drive in 50/60 Hz AC mains environments.
Technical Context
The T435-700B-TR is a three-quadrant triac built on ST's Snubberless technology, eliminating external snubber networks in inductive switching. Its high dV/dt immunity (400 V/µs) and low IGT (≤35 mA) support direct microcontroller interface without buffer stages.
It operates across -40 to +125 °C junction temperature, with 2.6 °C/W junction-to-case thermal resistance and 70 °C/W junction-to-ambient (DPAK, FR4 PCB, 35 µm Cu). The device sustains 30 A non-repetitive surge current (50 Hz, 20 ms) and exhibits 1.56 V max on-state voltage at 5.5 A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IT(rms) | 4 A - continuous RMS current handling for motor and solenoid loads without forced cooling |
| VDRM / VRRM | 700 V - peak repetitive blocking voltage suitable for 230 VAC mains with safety margin |
| IGT (max) | 35 mA - logic-compatible gate drive requirement, compatible with MCU GPIO or optocoupler outputs |
| dV/dt (min) | 400 V/µs at 125 °C - enables snubberless operation in highly inductive universal motor circuits |
| Rth(j-a) | 70 °C/W - thermal performance on standard FR4 PCB (0.5 cm² copper under tab), defines heatsink-free operation limits |
| VTM (max) | 1.56 V at 5.5 A - low conduction loss supports efficiency-critical 50–100 W appliance power stages |
| I²t (fusing) | 5.1 A²s - short-circuit withstand capability informs fuse coordination in protection design |
Pinout & Package
DPAK (TO-252) package: surface-mount, single-tab, lead-free, halogen-free epoxy molding; recommended footprint per Figure 13 (DocID7699 Rev 9); thermal pad soldered to PCB copper for optimal heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 (MT1) | Main terminal 1 | Reference electrode for gate triggering; connected to neutral or low-side AC line in phase-control topologies |
| A2 (MT2) | Main terminal 2 | High-side AC line connection; carries full load current and determines polarity of triggering quadrant |
| G | Gate | Three-quadrant trigger input; accepts positive/negative pulses relative to A1; 35 mA max IGT ensures TTL/CMOS compatibility |
Key Features
| Feature | Design Value |
|---|---|
| Snubberless operation | Eliminates external RC snubber components in inductive load switching, reducing BOM count and board space |
| Logic-level gate sensitivity | Max 35 mA IGT allows direct drive from microcontrollers or low-power optocouplers without amplification |
| High commutation robustness | 400 V/µs dV/dt and 50 A/µs dI/dt ratings ensure reliable turn-off under reactive load transients |
| Thermal performance | 70 °C/W Rth(j-a) on FR4 enables 4 A RMS operation with minimal copper area, no heatsink required |
| ECOPACK® compliance | Lead-free, halogen-free packaging meeting RoHS and environmental requirements for global appliance markets |
Applications
| Universal Motor Control | Kitchen Appliance Power Stage |
|---|---|
|
Use Scenario: Speed regulation of vacuum cleaner or power drill motors using phase-angle control. IC Role / Device Role / Timing Role: Main AC power switch triggered by zero-crossing synchronized gate pulses to modulate RMS voltage. Use Value: Snubberless operation avoids capacitor aging and failure in compact, thermally constrained motor housings. |
Use Scenario: On/off and power level control in blender, coffee maker, or dishwasher heating elements. IC Role / Device Role / Timing Role: Bidirectional AC switch activated by microcontroller PWM timing to deliver precise thermal energy. Use Value: 700 V VDRM provides margin against 230 VAC line surges, ensuring long-term reliability in consumer-grade products. |
| Electrovalve Actuation | Power Tool Trigger Circuit |
|
Use Scenario: Fast, silent switching of 24–230 VAC solenoid valves in washing machine water inlet systems. IC Role / Device Role / Timing Role: Zero-voltage turn-on triac minimizing EMI and contact arcing during valve energization. Use Value: 10 mA typical holding current (IH) ensures stable latching even with low-sustaining coil currents. |
Use Scenario: Safety-critical trigger control in corded angle grinders or jigsaws with variable speed demand. IC Role / Device Role / Timing Role: High-dI/dt-rated main switch handling inrush currents up to 30 A during motor startup. Use Value: 50 A/µs dI/dt rating prevents false turn-on during rapid current transients caused by brushed motor commutation. |
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 |
|---|---|---|---|
| ST T435-600B-TR | 600 V VDRM, identical package and IGT (35 mA), lower blocking voltage | Suitable only for 120 VAC or well-regulated 230 VAC systems with tight line tolerance | Select when cost optimization is prioritized and peak line voltage remains ≤650 V |
| Littelfuse Q4004L4 | 4 A/400 V, TO-220 package, 50 mA IGT, requires snubber network | Higher gate drive burden and larger footprint; needs external RC snubber for inductive loads | Choose only if legacy TO-220 mounting or higher surge rating (45 A) outweighs DPAK space savings |
Compared with T435-600B-TR, the 700 V rating adds 100 V margin for 230 VAC surge immunity; versus Q4004L4, the DPAK package reduces PCB area by 65% and eliminates snubber components, lowering system BOM and EMI filter complexity.
Availability
T435-700B-TR 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 across industrial and consumer production programs.
Supply support for T435-700B-TR 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, designing and manufacturing analog, power, and microcontroller solutions for automotive, industrial, and consumer markets.
The T4 series triacs are part of ST's power discrete portfolio, engineered specifically for snubberless AC phase control in cost-sensitive, space-constrained inductive load applications such as home appliances and power tools.
FAQ
What is the maximum junction temperature for continuous operation?
The T435-700B-TR has an operating junction temperature range of -40 to +125 °C. Continuous operation at 125 °C requires maintaining case temperature ≤110 °C per Table 3, achievable with ≥0.5 cm² copper area under the DPAK tab on FR4 PCB.
Does this triac require a heatsink in a 4 A RMS application?
No heatsink is required if mounted on FR4 PCB with ≥0.5 cm² copper area under the tab: Rth(j-a) = 70 °C/W yields ~280 °C rise at 4 A (P ≈ 4 A × 1.56 V = 6.24 W), but derating curves (Figure 3) confirm 4 A is sustainable at 50 °C ambient with that copper area.
Can T435-700B-TR be driven directly by a 3.3 V microcontroller GPIO?
Yes - with external current-limiting resistor. At 3.3 V and 35 mA max IGT, a 68 Ω resistor delivers ~30 mA into the gate, satisfying the trigger requirement while staying within GPIO current limits and avoiding gate overvoltage.
Is the DPAK package lead-free and RoHS compliant?
Yes - the T435-700B-TR uses a lead-free, halogen-free molding compound meeting UL94 V0 and RoHS Directive 2011/65/EU. ECOPACK® status is documented in ST's official product database and packaging specification sheets.
T435-700B-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- Snubberless™
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- Surface Mount
- Supplier Device Package:
- DPAK
T435-700B-TR FAQ
1.How can I place an order for T435-700B-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for T435-700B-TR 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 T435-700B-TR reliable?
The price and inventory of T435-700B-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for T435-700B-TR is usually 5 days.
3.What payment methods are accepted for T435-700B-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for T435-700B-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for T435-700B-TR?
T435-700B-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your T435-700B-TR 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 T435-700B-TR?
For technical support, including T435-700B-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your T435-700B-TR requirements.
6.How does Aetrix verify that T435-700B-TR is sourced from the original manufacturer or authorized distributors?
All T435-700B-TR 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 T435-700B-TR meets industry standards.
7.What is the process for return or replacement of T435-700B-TR?
All T435-700B-TR units undergo pre-shipment inspection (PSI). If there is an issue with T435-700B-TR, 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 T435-700B-TR part is unused and in its original packaging.
Return procedure for T435-700B-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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