My Inquiry
My Account
Diodes Incorporated T8M35T800UB
- Part No.:
- T8M35T800UB
- Manufacturer:
- Diodes Incorporated
- Category:
- TRIACs
- Package:
- TO-220-3
- Datasheet:
-
T8M35T800UB.pdf
- Description:
- THYRISTOR TO220AB TUBE 50PCS
- Quantity:
- Payment:
- Shipping:
Inventory:6,086
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
T8M35T800UB from Diodes Incorporated is a glass-passivated, lead-free, halogen-free TRIAC designed for AC power switching in mains-connected loads. It delivers 8A RMS on-state current at 125°C junction temperature, with 800V repetitive peak off-state voltage (VDRM/VRRM), 35mA gate trigger current (IGT3), and operates reliably across –40°C to +125°C ambient. It is used in motor speed controls for electric drills and heating systems requiring quadrant-3 triggering only.
For engineers reviewing the T8M35T800UB datasheet, T8M35T800UB pinout, T8M35T800UB application, or T8M35T800UB equivalent, key selection criteria include verified dV/dt immunity (2000 V/µs at TJ = +125°C), latching current (IL3 = 50 mA), holding current (IH3 = 50 mA), thermal resistance (RθJC = 1.9 °C/W), and TO220AB package compatibility with standard heatsinks.
Technical Context
This bidirectional thyristor switches AC line voltage using gate-triggered conduction in Quadrants I, II, and III only-Quadrant IV triggering is not supported. Its glass passivation ensures stable VDRM/VRRM performance under humidity and thermal stress, while the 1.9 °C/W junction-to-case thermal resistance enables 8A RMS operation with appropriate heatsinking.
The device exhibits 1.6V on-state voltage at 8A and 70mA gate drive, with dI/dt capability of 100 A/µs and commutating dI/dt rating of 4.5 A/ms at TJ = +125°C. Its 15.1 A²s I²t fusing value defines short-circuit withstand time under 50Hz surge conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDRM / VRRM | 800 V - Withstands 800V peak reverse/off-state voltage without conduction, enabling direct 230VAC or 115VAC mains switching. |
| IT(RMS) | 8 A - Sustains 8A RMS load current at TJ = +125°C, suitable for medium-power AC motors and heaters. |
| IGT3 | 35 mA - Maximum gate trigger current required in Quadrant III, defining minimum driver strength needed. |
| dV/dt (TJ = +125°C) | 2000 V/µs - High noise immunity prevents false turn-on during fast transients on AC lines. |
| RθJC | 1.9 °C/W - Junction-to-case thermal resistance enables efficient heat transfer to heatsink for continuous 8A operation. |
| I²t (fusing) | 15.1 A²s - Energy withstand limit for 10ms fault pulses, informing fuse coordination in protection design. |
| VT (IT = 8A) | 1.6 V - On-state voltage drop determines conduction loss (12.8W max) and thermal design margin. |
Pinout & Package
Package: TO220AB (Type WX), molded plastic, matte tin-plated leads, UL 94V-0 rated, 2.08g weight. Mounting pad: aluminum, 45mm × 30mm × 24mm fin-type heatsink per JESD-51.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| MT1 (Main Terminal 1) | Anode for forward conduction; cathode for reverse conduction | Primary current path terminal-must be connected to load return side in standard phase-control configurations. |
| MT2 (Main Terminal 2) | Cathode for forward conduction; anode for reverse conduction | Main current path terminal-typically connected to AC line input; polarity determines quadrant behavior. |
| G (Gate) | Control electrode for triggering conduction | Accepts low-energy pulse (≤35mA) to initiate bidirectional conduction; requires external RC snubber for reliable quadrant-3 triggering. |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivation | Ensures long-term VDRM stability and reliability under humid, high-voltage stress conditions. |
| Quadrant-3 triggering only | Reduces gate drive complexity by eliminating need for negative gate bias circuitry in many AC control topologies. |
| 125°C maximum junction temperature | Enables compact thermal design in enclosed industrial enclosures without forced air cooling. |
| Lead-free & halogen-free ("Green") | Complies with RoHS 3 (2015/863/EU) and automotive change-control requirements when qualified. |
| TO220AB mechanical robustness | Supports >50,000 thermal cycles and mechanical vibration up to 20g in motor control environments. |
Applications
| Electric Drill Speed Control | Fan Speed Regulation |
|---|---|
Use Scenario: Variable-speed control of universal motor in corded power tools using phase-angle triggering. IC Role / Device Role / Timing Role: Bidirectional AC switch triggered mid-cycle to adjust RMS voltage delivered to motor windings. Use Value: Enables smooth torque control down to 20% speed with <1.6V conduction loss, reducing thermal stress on motor brushes. |
Use Scenario: Low-cost airflow modulation in HVAC blowers and kitchen exhaust fans. IC Role / Device Role / Timing Role: TRIAC-based leading-edge dimming circuit synchronized to zero-crossing detection. Use Value: Delivers 8A RMS switching at 50/60Hz with 2000 V/µs dV/dt immunity, preventing false triggering from fan back-EMF spikes. |
| Resistive Heating Control | Coffee Machine Brew Cycle |
Use Scenario: On/off and proportional control of 1–2 kW resistive heating elements in industrial ovens. IC Role / Device Role / Timing Role: Mains-isolated power switch driven by microcontroller via optocoupler. Use Value: Supports 800V blocking and 55A non-repetitive surge (ITSM), handling inrush currents of cold heating coils. |
Use Scenario: Precise 30–90 second heater activation during coffee extraction cycle. IC Role / Device Role / Timing Role: AC power switch enabling timed, full-wave power delivery to thermoblock heater. Use Value: 50mA latching current (IL3) ensures stable conduction during brief 30s cycles without gate retriggering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TRIAC-based AC power switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STMicroelectronics BTB16-800BR | 16A IT(RMS), higher IGT (50mA), same VDRM/VRRM, TO220AB package | Higher current headroom but requires stronger gate drive; less suitable for space-constrained 8A designs | Select when future-proofing for 12A+ loads or needing higher I²t (32 A²s) |
| Littelfuse Q6008LH4 | 8A IT(RMS), 35mA IGT, but lower dV/dt (1000 V/µs), TO220 package variant | Reduced noise immunity increases risk of false triggering in EMI-heavy motor environments | Prefer only in low-noise residential lighting applications where cost is primary constraint |
Compared with BTB16-800BR and Q6008LH4, T8M35T800UB offers optimal balance of gate sensitivity (35mA), dV/dt immunity (2000 V/µs), and thermal efficiency (1.9 °C/W) for 8A industrial motor and heating controls where reliability under electrical stress is critical.
Availability
T8M35T800UB is available at Aetrix Electronics and suitable for electric drill speed control, fan speed regulation, and resistive heating systems requiring stable component supply, RoHS-compliant manufacturing, and AEC-Q200-aligned production traceability.
Supply support for T8M35T800UB 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with ISO 9001 and IATF 16949 certified facilities.
This TRIAC belongs to Diodes' high-voltage, high-reliability power switching portfolio, engineered specifically for cost-sensitive yet robust AC mains control in industrial, appliance, and power tool applications.
FAQ
What is the maximum allowable gate trigger voltage for reliable turn-on?
The maximum gate trigger voltage (VGT3) is 1.5V at TJ = +25°C and remains ≤1.5V up to +125°C per Figure 11. Exceeding this voltage risks gate oxide stress; design must ensure gate drive stays within 1.2–1.5V range with ≤35mA current to guarantee quadrant-3 triggering without degradation.
Can T8M35T800UB replace T8M10T800UB in existing designs?
Yes-both share identical VDRM (800V), IT(RMS) (8A), package (TO220AB), and thermal specs. The only difference is gate sensitivity: T8M35T800UB requires up to 35mA IGT vs. 10mA for T8M10T800UB. Existing gate drivers must deliver ≥35mA to ensure reliable turn-on; otherwise, timing margin may degrade.
Is heatsinking mandatory for 8A continuous operation?
Yes. At 8A RMS and 1.6V VT, power dissipation reaches 12.8W. With RθJC = 1.9 °C/W and max TJ = +125°C, case temperature must stay ≤103°C-requiring a minimum 45mm × 30mm × 24mm finned aluminum heatsink per JESD-51 test condition. No heatsink limits safe current to <1.5A.
Does this TRIAC support snubberless operation?
No. Although dV/dt rating is high (2000 V/µs), the datasheet specifies "snubber recommended" for commutation in inductive loads. Snubberless operation is not characterized; omitting RC snubbers risks commutation failure in motor or transformer-driven circuits due to insufficient (dI/dt)c margin (4.5 A/ms).
T8M35T800UB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Bulk
- Product Status:
- Active
- Triac Type:
- Standard
- Voltage - Off State:
- 800 V
- Current - On State (It (RMS)) (Max):
- 8 A
- Voltage - Gate Trigger (Vgt) (Max):
- 1.5 V
- Current - Non Rep. Surge 50, 60Hz (Itsm):
- 55A, 60A
- Current - Gate Trigger (Igt) (Max):
- 35 mA
- Current - Hold (Ih) (Max):
- 50 mA
- Configuration:
- Single
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO220AB (Type WX)
T8M35T800UB FAQ
1.How can I place an order for T8M35T800UB through Aetrix?
Please submit a Request for Quotation (RFQ) for T8M35T800UB 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 T8M35T800UB reliable?
The price and inventory of T8M35T800UB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for T8M35T800UB is usually 5 days.
3.What payment methods are accepted for T8M35T800UB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for T8M35T800UB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for T8M35T800UB?
T8M35T800UB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your T8M35T800UB 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 T8M35T800UB?
For technical support, including T8M35T800UB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your T8M35T800UB requirements.
6.How does Aetrix verify that T8M35T800UB is sourced from the original manufacturer or authorized distributors?
All T8M35T800UB 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 T8M35T800UB meets industry standards.
7.What is the process for return or replacement of T8M35T800UB?
All T8M35T800UB units undergo pre-shipment inspection (PSI). If there is an issue with T8M35T800UB, 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 T8M35T800UB part is unused and in its original packaging.
Return procedure for T8M35T800UB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
T8M35T800UB 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
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…
