My Inquiry
My Account
STMicroelectronics T1235T-6I
- Part No.:
- T1235T-6I
- Manufacturer:
- STMicroelectronics
- Category:
- TRIACs
- Package:
- TO-220-3
- Datasheet:
-
T1235T-6I.pdf
- Description:
- TRIAC ALTERNSTR 600V 12A TO220AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,505
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
T1235T-6I from STMicroelectronics is a Snubberless™, 3-quadrant, logic-level-compatible 12 A, 600 V TRIAC in a TO-220AB insulated package, rated for 95 A non-repetitive surge current (60 Hz), 50 A/µs dI/dt, and 2000 V/µs dV/dt at 125 °C - used for phase-angle and on/off AC line switching in motor control circuits of power tools and small home appliances.
For engineers reviewing the T1235T-6I datasheet, T1235T-6I pinout, T1235T-6I application, or T1235T-6I equivalent, key selection criteria include gate trigger current (35 mA max, Q1–Q3), insulated 2500 Vrms creepage, low thermal resistance (2.6 °C/W j-c), and snubberless operation enabling simplified PCB layout in cost-sensitive AC load control designs.
Technical Context
The T1235T-6I is a 3-quadrant Snubberless TRIAC optimized for high commutation robustness without external snubbers. It supports phase-angle control and zero-crossing switching with guaranteed IGT ≤ 35 mA across quadrants I, II, and III, and exhibits 2000 V/µs critical dV/dt immunity at Tj = 125 °C under gate-open conditions.
Its design integrates clip-bonded die construction for low Rth(j-c) (2.6 °C/W) and high thermal cycling reliability. The TO-220AB insulated package provides reinforced isolation (2500 Vrms) and meets UL E81734 certification and RoHS 2002/95/EC compliance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IT(RMS) | 12 A RMS continuous current at Tc = 88 °C - supports sustained load switching in 120/230 V AC systems without forced cooling. |
| VDRM/VRRM | 600 V blocking voltage - enables use in global mains applications including 230 V AC + 20% tolerance. |
| IGT (Q1–Q3) | ≤35 mA max - ensures reliable triggering with standard microcontroller GPIO or low-power driver ICs. |
| dV/dt (Tj = 125 °C) | 2000 V/µs - eliminates need for snubber networks in noisy industrial or motor-drive environments. |
| Rth(j-c) | 2.6 °C/W - allows direct heatsink mounting for compact thermal management in space-constrained appliances. |
| VT / RD | 1.55 V max VT, 35 mΩ max dynamic resistance - minimizes conduction loss and self-heating at full load. |
| I²t (fusing) | 54 A²s (10 ms) - defines short-circuit withstand capability for coordination with fast-acting fuses. |
Pinout & Package
TO-220AB insulated package with creepage ≥ 8 mm and reinforced insulation rated 2500 Vrms; lead-free, RoHS-compliant, UL E81734 certified.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 (MT1) | Main Terminal 1 | Reference terminal for gate triggering; connected to load return or neutral side in AC switching topologies. |
| A2 (MT2) | Main Terminal 2 | High-side AC line connection; carries full load current and must be routed with adequate creepage/clearance. |
| G | Gate | Trigger input referenced to A1; requires ≤35 mA pulse for turn-on in quadrants I, II, and III. |
Key Features
| Feature | Design Value |
|---|---|
| Snubberless™ operation | Enables elimination of RC snubber networks, reducing BOM count and PCB area in AC dimming and motor control. |
| Insulated TO-220AB package | Provides 2500 Vrms isolation between case and terminals - simplifies safety certification for Class I appliances. |
| Low thermal resistance | 2.6 °C/W junction-to-case enables >10 W dissipation with modest heatsinking - extends lifetime in sealed enclosures. |
| High dI/dt immunity | 50 A/µs critical rate-of-rise tolerance prevents false turn-on during inductive load commutation transients. |
| UL certification | File E81734 confirms compliance with UL 1557 for reinforced insulation - reduces qualification effort for North American markets. |
Applications
| Power Tool Motor Control | Dimmable LED Lighting Driver |
|---|---|
|
Use Scenario: Variable-speed control of universal motors in corded drills and sanders using phase-angle modulation. IC Role / Device Role / Timing Role: Main AC power switch triggered by zero-crossing detector and PWM-controlled gate driver. Use Value: Snubberless operation avoids snubber losses and component stress during frequent motor start-stop cycles. |
Use Scenario: Leading-edge dimming interface between microcontroller and 230 V AC-fed LED driver modules. IC Role / Device Role / Timing Role: AC line switch synchronized to zero-crossing for smooth brightness adjustment without flicker. Use Value: 35 mA IGT ensures compatibility with low-power MCU outputs; 2000 V/µs dV/dt prevents false triggering from EMI. |
| Small Appliance Heater Control | Inrush Current Limiter |
|
Use Scenario: On/off cycling of resistive heating elements in coffee makers and kettles. IC Role / Device Role / Timing Role: High-reliability AC switch replacing electromechanical relays to eliminate contact wear. Use Value: 95 A surge rating handles cold-resistance inrush of 1500 W heaters; insulated package meets IEC 60335 creepage requirements. |
Use Scenario: Controlled turn-on of large capacitive input stages in SMPS or audio amplifiers. IC Role / Device Role / Timing Role: Soft-start switch bypassing NTC thermistor after initial charge completion. Use Value: 12 A RMS rating and 54 A²s I²t withstand support repeated inrush events without degradation. |
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 |
|---|---|---|---|
| T1220T-6I | Lower IGT (20 mA max, Q1–Q3) and reduced dV/dt (1000 V/µs at 125 °C) | Suitable for lower-noise environments with simpler gate drive; less robust against EMI-induced false triggering | Select when gate drive current budget is tight (<20 mA) and system noise is controlled. |
| BTA12-600BRG | Standard 4-quadrant TRIAC; IGT = 50 mA (Q4), no Snubberless rating; Rth(j-c) = 3.0 °C/W | Lacks snubberless certification and 3Q optimization; requires external snubber in noisy motor loads | Choose only if legacy 4Q compatibility is required and board space permits snubber components. |
Compared with T1220T-6I and BTA12-600BRG, the T1235T-6I delivers superior noise immunity and thermal efficiency for demanding motor and lighting controls where snubber elimination and long-term reliability are critical.
Availability
T1235T-6I is available at Aetrix Electronics and suitable for motor control in power tools, dimmable lighting systems, and heater switching in small home appliances requiring stable component supply and long-lifecycle support.
Supply support for T1235T-6I 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, digital, and mixed-signal ICs for industrial, automotive, and consumer applications.
The T12T series belongs to ST's high-reliability AC power switching portfolio, engineered specifically for cost-sensitive, high-volume appliance and power tool manufacturers needing robust, certified, and snubber-free TRIAC solutions.
FAQ
Is the T1235T-6I compatible with zero-crossing detection circuits?
Yes - the T1235T-6I supports both phase-angle and zero-crossing switching modes. Its 35 mA IGT (Q1–Q3) and 2000 V/µs dV/dt immunity ensure reliable turn-on synchronization with zero-crossing signals even in electrically noisy environments like power tool motor drives.
What is the maximum allowable case temperature for continuous 12 A operation?
The datasheet specifies IT(RMS) = 12 A at Tc = 88 °C. Exceeding this case temperature requires derating per Figure 2; at Tc = 100 °C, maximum sustainable RMS current drops to approximately 9.5 A to maintain Tj ≤ 125 °C.
Does the TO-220AB insulated package require additional isolation barriers on PCB?
No - the TO-220AB insulated variant provides reinforced insulation rated 2500 Vrms between leads and case, satisfying creepage and clearance requirements per IEC 60335 for Class I appliances without supplemental PCB barriers.
Can the T1235T-6I replace a BTA12-600B in an existing design?
Direct replacement is possible only if the circuit uses 3-quadrant triggering and does not rely on Q4 operation. The T1235T-6I offers higher dV/dt immunity and lower thermal resistance but lacks Q4 gate sensitivity - verify gate drive polarity and transient noise profile before substitution.
T1235T-6I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- Product Status:
- Active
- Triac Type:
- Alternistor - Snubberless
- Voltage - Off State:
- 600 V
- Current - On State (It (RMS)) (Max):
- 12 A
- Voltage - Gate Trigger (Vgt) (Max):
- 1.3 V
- Current - Non Rep. Surge 50, 60Hz (Itsm):
- 90A, 95A
- Current - Gate Trigger (Igt) (Max):
- 35 mA
- Current - Hold (Ih) (Max):
- 30 mA
- Configuration:
- Single
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220AB Insulated
T1235T-6I FAQ
1.How can I place an order for T1235T-6I through Aetrix?
Please submit a Request for Quotation (RFQ) for T1235T-6I 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 T1235T-6I reliable?
The price and inventory of T1235T-6I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for T1235T-6I is usually 5 days.
3.What payment methods are accepted for T1235T-6I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for T1235T-6I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for T1235T-6I?
T1235T-6I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your T1235T-6I 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 T1235T-6I?
For technical support, including T1235T-6I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your T1235T-6I requirements.
6.How does Aetrix verify that T1235T-6I is sourced from the original manufacturer or authorized distributors?
All T1235T-6I 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 T1235T-6I meets industry standards.
7.What is the process for return or replacement of T1235T-6I?
All T1235T-6I units undergo pre-shipment inspection (PSI). If there is an issue with T1235T-6I, 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 T1235T-6I part is unused and in its original packaging.
Return procedure for T1235T-6I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
T1235T-6I Tags
-
Z0103NN5AA4
STMicroelectronics
-
Z0107MNT1G
Littelfuse Inc.
-
Z0103MNT1G
Littelfuse Inc.
;;2.jpg)
-
T405-800B-TR
STMicroelectronics
-
T835-600B-TR
STMicroelectronics
.JPG)
-
2N6073BG
Littelfuse Inc.
-
2N6075BG
Littelfuse Inc.
-
BTA08-600CWRG
STMicroelectronics
-
T835H-6G-TR
STMicroelectronics
-
BTA16-800BRG
STMicroelectronics
-
T1210-800G-TR
STMicroelectronics
-
MAC4DHMT4G
Littelfuse Inc.
Tech Hub
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
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…
