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Home > Products > Discrete Semiconductor Products > Thyristors > TRIACs

STMicroelectronics T435-600B

Name: T435-600B
Brand: STMicroelectronics
SKU: T435-600B
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: T435-600B

Manufacturer:: STMicroelectronics

Category:: TRIACs

Package:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Datasheet:: T435-600B.pdf

Description:: TRIAC ALTERNISTOR 600V 4A DPAK

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Product details

Overview

T435-600B from STMicroelectronics is a 4 A, 600 V snubberless three-quadrant triac optimized for AC inductive load switching in universal motor control, electrovalves, and kitchen appliances. 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 robust commutation without external snubbers in compact designs.

For engineers reviewing the T435-600B datasheet, T435-600B pinout, T435-600B application, or T435-600B equivalent, key selection criteria include its snubberless operation, DPAK package thermal performance (R_th(j-c) = 2.6 °C/W), logic-level compatibility with microcontroller-driven gate drivers, and suitability for 50/60 Hz mains-powered motor loads requiring high commutation reliability.

Technical Context

The T435-600B employs ST's Snubberless™ technology to achieve 400 V/µs transient immunity (dV/dt) and 50 A/µs dI/dt capability at 125 °C junction temperature - eliminating need for RC snubber networks in typical 230 VAC inductive circuits. Its three-quadrant operation restricts triggering to quadrants I, II, and III, improving noise immunity over four-quadrant devices.

It delivers 4 A RMS on-state current with 1.56 V max V_TM at 25 °C and 120 mΩ dynamic resistance (R_d) at 125 °C, supporting low conduction losses in thermally constrained PCB layouts. The device is rated for 30 A non-repetitive surge (50 Hz, 20 ms) and operates across –40 to +125 °C junction range.

Key Specifications

Parameter	Value and Actual Design Meaning
IT(rms)	4 A - Sustained AC load current handling for continuous motor or valve operation
VDRM / VRRM	600 V - Peak repetitive off-state voltage blocking capability for 230 VAC mains applications
IGT (max)	35 mA - Gate drive current requirement compatible with standard MCU GPIO or low-power drivers
dV/dt (min)	400 V/µs at 125 °C - Enables snubberless operation in noisy inductive environments
Rth(j-c)	2.6 °C/W - Junction-to-case thermal resistance enabling 4 A operation at 110 °C case temperature
IL (max)	50 mA - Latching current threshold ensuring reliable turn-on under light-load conditions
IH (max)	35 mA - Holding current level defining minimum load current to sustain conduction

Pinout & Package

DPAK (TO-252) surface-mount package with isolated tab; 3-terminal configuration optimized for thermal transfer to copper pour on FR4 PCBs (R_th(j-a) = 70 °C/W with 0.5 cm² copper).

Pin/Terminal	Circuit Role	Design Meaning
A1 (MT1)	Main Terminal 1	Reference terminal for gate trigger; connected to neutral or low-side of AC load
A2 (MT2)	Main Terminal 2	High-side AC line connection; carries full load current and voltage stress
G	Gate	Control input; triggers conduction when referenced to A1 with ≥35 mA pulse

Key Features

Feature	Design Value
Snubberless operation	Eliminates external RC network for dV/dt protection - reduces BOM count and board space in motor drives
Three-quadrant triggering	Blocks quadrant IV triggering - improves EMI immunity and prevents false turn-on from negative gate transients
High dI/dt immunity	50 A/µs critical rate-of-rise ensures reliable turn-on even with fast-rising inductive currents
Low V_TM & R_d	1.56 V max on-state voltage and 120 mΩ dynamic resistance minimize conduction loss and self-heating
ECOPACK® compliance	Lead-free, halogen-free epoxy molding compound meeting UL94 V0 flammability standard

Applications

Universal Motor Control

Electrovalve Actuation

Use Scenario: Speed and direction control of brushed universal motors in power tools and vacuum cleaners using phase-angle or zero-crossing AC switching.

IC Role / Device Role / Timing Role: Main AC power switch interfacing between microcontroller PWM output and motor winding.

Use Value: Snubberless design enables direct MCU drive without isolation transformers or snubbers, reducing system cost and footprint by >30% vs. legacy triacs.

Use Scenario: On/off control of solenoid valves in washing machines and dishwashers operating from 230 VAC mains.

IC Role / Device Role / Timing Role: High-reliability AC load switch triggered by logic-level gate pulses synchronized to zero-crossing detection.

Use Value: 400 V/µs dV/dt immunity prevents false triggering during valve coil de-energization transients, eliminating need for TVS clamping.

Kitchen Appliance Heating

Small Home Appliance Fan Control

Use Scenario: Power regulation for heating elements in toaster ovens and coffee makers via leading-edge phase control.

IC Role / Device Role / Timing Role: Primary AC power regulator modulating RMS voltage delivered to resistive heating loads.

Use Value: 4 A RMS rating and 30 A surge capacity support intermittent high-power bursts without thermal derating or heatsinking.

Use Scenario: Variable-speed AC fan control in air purifiers and exhaust hoods using trailing-edge dimming.

IC Role / Device Role / Timing Role: Bidirectional AC switch enabling precise RMS current control for torque-sensitive induction fans.

Use Value: Three-quadrant operation suppresses audible noise from quadrant IV misfiring, improving acoustic performance in consumer environments.

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
BT138-600D	4 A RMS, 600 V, 50 mA IGT, four-quadrant, TO-220 package	Lacks snubberless dV/dt rating (only 100 V/µs); requires external snubber in inductive loads	Select when cost sensitivity outweighs board space constraints and snubber components are acceptable
MAC4DCM-600A	4 A RMS, 600 V, 35 mA IGT, three-quadrant, DPAK, but only 100 V/µs dV/dt at 125 °C	Lower dV/dt immunity necessitates snubber use in motor control; higher R_th(j-c) = 3.5 °C/W	Prefer only for low-noise resistive loads where snubberless operation is not required

Compared with BT138-600D and MAC4DCM-600A, the T435-600B uniquely combines DPAK packaging, 400 V/µs snubberless dV/dt, and 35 mA IGT - delivering superior integration, reduced component count, and higher reliability in thermally constrained inductive switching applications.

Availability

T435-600B is available at Aetrix Electronics and suitable for universal motor control, electrovalve actuation, and kitchen appliance heating requiring stable component supply across industrial production cycles.

Supply support for T435-600B 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, MCU, and sensor solutions for automotive, industrial, and consumer markets.

The T4 series triacs are part of ST's power discrete portfolio, engineered specifically for snubberless AC inductive load control - targeting cost-sensitive, space-constrained applications in home appliances and industrial automation.

FAQ

Is the T435-600B compatible with microcontroller GPIOs without buffer stages?

Yes - with a maximum gate trigger current (IGT) of 35 mA and gate trigger voltage (VGT) ≤1.3 V, the T435-600B can be directly driven by most 3.3 V or 5 V MCU GPIOs using a series resistor (e.g., 150 Ω for 3.3 V). No external transistor buffer is needed for standard phase-control or zero-crossing switching.

Does the T435-600B require a heatsink in 4 A continuous operation?

No - at 4 A RMS and T_c = 110 °C, the device operates within its absolute maximum ratings using only PCB copper thermal relief (R_th(j-c) = 2.6 °C/W). A heatsink is unnecessary unless ambient temperature exceeds 70 °C or duty cycle approaches 100% with limited copper area.

What is the significance of "three-quadrant" operation in the T435-600B?

Three-quadrant operation restricts gate triggering to quadrants I (A2+, G+), II (A2–, G+), and III (A2–, G–), excluding quadrant IV (A2+, G–). This eliminates false triggering from negative gate noise spikes - a common failure mode in noisy motor-drive environments - improving system robustness without added filtering.

Can the T435-600B replace older T405 or T410 variants in existing designs?

Yes - it shares identical DPAK footprint and pinout with T405-600B and T410-600B, but offers higher IGT (35 mA vs. 5/10 mA) and significantly improved dV/dt (400 V/µs vs. 20/40 V/µs). Designers must verify gate driver strength and update timing margins for faster commutation, but no layout change is required.

T435-600B Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: Snubberless™

Package/Case:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Packaging:: Tube

Product Status:: Active

Triac Type:: Alternistor - Snubberless

Voltage - Off State:: 600 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

T435-600B FAQ

1.How can I place an order for T435-600B through Aetrix?

Please submit a Request for Quotation (RFQ) for T435-600B 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 T435-600B reliable?

The price and inventory of T435-600B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for T435-600B is usually 5 days.

3.What payment methods are accepted for T435-600B?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for T435-600B transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for T435-600B?

T435-600B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your T435-600B 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 T435-600B?

For technical support, including T435-600B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your T435-600B requirements.

6.How does Aetrix verify that T435-600B is sourced from the original manufacturer or authorized distributors?

All T435-600B 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 T435-600B meets industry standards.

7.What is the process for return or replacement of T435-600B?

All T435-600B units undergo pre-shipment inspection (PSI). If there is an issue with T435-600B, 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 T435-600B part is unused and in its original packaging.

Return procedure for T435-600B:

1.Submit a request within 90 days.

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

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