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STMicroelectronics TN1205H-6T
- Part No.:
- TN1205H-6T
- Manufacturer:
- STMicroelectronics
- Category:
- SCRs
- Package:
- TO-220-3
- Datasheet:
-
TN1205H-6T.pdf
- Description:
- SCR 600V 12A TO220AB
- Quantity:
- Payment:
- Shipping:
Inventory:1,907
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Product details
Overview
TN1205H-6T from STMicroelectronics is a 600 V, 12 A RMS, medium-current silicon-controlled rectifier (SCR) in TO-220AB package, with gate trigger current of 2–5 mA and rated for continuous operation up to 150 °C junction temperature. It serves as a high-noise-immunity AC line switch in motor control, lighting, and overvoltage crowbar protection circuits.
For engineers reviewing the TN1205H-6T datasheet, TN1205H-6T pinout, TN1205H-6T application, or TN1205H-6T equivalent, key selection criteria include dV/dt immunity at 150 °C, I²t rating of 72 A²s, thermal resistance Rth(j-c) = 1.3 °C/W, and compatibility with high-ambient-temperature environments where forced cooling is limited.
Technical Context
This SCR operates in full-wave phase-controlled AC switching mode, supporting gate-triggered conduction with latching behavior after turn-on. Its critical dV/dt immunity (100 V/µs at Tj = 150 °C) and low holding current (IH ≤ 20 mA) ensure robust false-trigger rejection in noisy industrial mains environments.
The device features a low on-state voltage drop (VT = 1.6 V at 24 A, 25 °C; 0.80 V at 150 °C) and dynamic resistance of 30 mΩ, enabling efficient power handling with minimal conduction loss across its 12 A RMS rating and 126 A non-repetitive surge capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDRM / VRRM | 600 V - Maximum repetitive peak off-state voltage; defines maximum AC line voltage it can block safely in half-cycle applications. |
| IT(RMS) | 12 A - RMS on-state current at Tc = 136 °C; determines continuous load current capacity with heatsink. |
| IGT | 2–5 mA - Gate trigger current range; sets minimum drive requirement for reliable turn-on under worst-case temperature conditions. |
| dV/dt (Tj = 150 °C) | 100 V/µs - Minimum rate of rise of off-state voltage before spurious turn-on; critical for EMI-rich motor drive or dimmer environments. |
| I²t (tp = 10 ms) | 72 A²s - Fusing energy rating; used to coordinate upstream fuse selection for short-circuit protection without nuisance blowing. |
| Rth(j-c) | 1.3 °C/W - Junction-to-case thermal resistance; enables direct calculation of case temperature rise under given power dissipation. |
| dl/dt | 100 A/µs - Critical rate of rise of on-state current; ensures safe commutation during fast-switching transients without latch-up failure. |
Pinout & Package
TO-220AB package with isolated tab (electrically connected to cathode), 3-pin through-hole mounting. Standard pin assignment: Pin 1 = Anode (A), Pin 2 = Cathode (K), Pin 3 = Gate (G). Tab is electrically tied to cathode and serves as primary heat path.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (A) | Anode | Main current entry terminal during forward conduction; must be connected to AC line or load side depending on circuit topology. |
| Pin 2 (K) | Cathode | Main current exit terminal; also connected to metal tab for thermal and electrical reference; requires isolation if tab is mounted to heatsink. |
| Pin 3 (G) | Gate | Control input for triggering conduction; requires ≥2 mA pulse with <1.3 V threshold to initiate latching at 25 °C. |
Key Features
| Feature | Design Value |
|---|---|
| High junction temperature rating | 150 °C continuous operation enables use in sealed enclosures or high-ambient environments without derating. |
| High noise immunity | 100 V/µs dV/dt at 150 °C prevents false triggering from EMI in motor drives or dimmers near switching loads. |
| Low on-state voltage | 0.80 V threshold at 150 °C reduces conduction losses and improves thermal margin in high-duty-cycle applications. |
| Robust surge capability | 126 A non-repetitive surge (8.3 ms) supports inrush current limiting in transformer-fed or capacitive-input supplies. |
Applications
| Motor Control in Power Tools | Overvoltage Crowbar Protection |
|---|---|
Use Scenario: Phase-angle controlled speed regulation in corded drills and angle grinders operating from 115/230 VAC mains. IC Role / Device Role / Timing Role: Main AC power switch triggered by zero-crossing synchronized gate pulses to regulate average motor torque. Use Value: High dV/dt immunity prevents misfiring during brush-commutator arcing; 150 °C rating accommodates enclosed tool housings with limited airflow. | Use Scenario: Fast-acting shunt protection for DC bus rails in SMPS or lab power supplies against transient overvoltage events. IC Role / Device Role / Timing Role: Latched crowbar element triggered by comparator output when bus exceeds safe threshold; conducts until main fuse opens. Use Value: Low gate trigger current (2 mA) allows direct drive from low-power comparators; 126 A surge withstand handles capacitor discharge energy. |
| Inrush Current Limiting | Resistive Load Switching in Appliances |
Use Scenario: Controlled turn-on of cold tungsten filaments or NTC-bypassed transformer primaries to limit peak current surges. IC Role / Device Role / Timing Role: Delayed-conduction switch activated after thermistor cooldown or timing delay, bypassing inrush-limiting impedance. Use Value: 72 A²s I²t rating permits precise coordination with slow-blow fuses; 12 A RMS rating covers typical appliance loads up to 2.8 kW. | Use Scenario: On/off switching of heating elements in coffee makers, rice cookers, and irons powered directly from AC mains. IC Role / Device Role / Timing Role: Zero-voltage switched AC load controller using microcontroller-driven gate pulses to minimize EMI and contact wear. Use Value: TO-220AB package provides mechanical robustness and thermal stability for repeated thermal cycling; RoHS-compliant lead finish meets global appliance safety standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SCR-based AC switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ST's TN1215H-6T | Higher IGT (15 mA max), same VDRM/RMS rating and package | Better suited for gate-drive circuits with higher source impedance or lower supply voltage | Select when gate driver cannot reliably deliver ≥2 mA into 33 Ω load at elevated temperature |
| Littelfuse S4012L | Same 600 V/12 A rating, but TO-220 package with non-isolated tab and 10 mA IGT | Requires insulated mounting hardware due to tab-to-cathode short; lower dV/dt (50 V/µs @ 125 °C) | Choose only if cost sensitivity outweighs need for high-noise immunity and thermal margin |
Compared with TN1205H-6T, TN1215H-6T trades lower gate sensitivity for improved drive margin, while S4012L sacrifices dV/dt performance and thermal robustness for legacy compatibility-neither offers identical combination of 2 mA IGT, 100 V/µs dV/dt at 150 °C, and isolated-tab TO-220AB packaging.
Availability
TN1205H-6T is available at Aetrix Electronics and suitable for motor control in power tools, overvoltage crowbar protection circuits, and inrush current limiting applications requiring stable component supply across extended production lifecycles.
Supply support for TN1205H-6T 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, MCU, power, and sensing solutions for industrial, automotive, and consumer markets.
TN1205H belongs to ST's high-temperature SCR product line, engineered specifically for reliable AC power control in thermally constrained, high-noise environments such as portable power tools, kitchen appliances, and industrial controls.
FAQ
What is the maximum allowable gate-cathode reverse voltage for TN1205H-6T?
The maximum peak reverse gate voltage (VRGM) is 5 V. Exceeding this value risks permanent gate junction damage. Designers must ensure gate drive circuits limit reverse voltage using clamping diodes or resistor-diode networks, especially in phase-control topologies where gate may float negative relative to cathode during AC half-cycles.
Can TN1205H-6T be used in DC switching applications?
No-it is not rated for DC blocking or commutation. As an SCR, it lacks inherent turn-off capability and requires external circuitry (e.g., forced commutation, series inductor, or auxiliary thyristor) to interrupt DC current. Its datasheet specifies only AC-rated parameters (VDRM/VRRM, IT(RMS)) and does not guarantee safe operation in pure DC hold conditions.
Is the TO-220AB tab electrically isolated in TN1205H-6T?
Yes-the TO-220AB package used for TN1205H-6T features an electrically isolated tab internally connected to the cathode. This allows direct mounting to a grounded heatsink without additional insulation, simplifying thermal design while maintaining galvanic separation between heatsink and anode circuitry.
How does junction temperature affect gate trigger current?
IGT increases with rising junction temperature: at Tj = 150 °C, IGT is approximately 1.8× its 25 °C value (typical curve shows ~1.6× increase). Therefore, gate drive circuits must maintain ≥5 mA capability across the full –40 to +150 °C operating range to ensure reliable turn-on under worst-case thermal conditions.
TN1205H-6T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- Product Status:
- Active
- Voltage - Off State:
- 600 V
- Voltage - Gate Trigger (Vgt) (Max):
- 1.3 V
- Current - Gate Trigger (Igt) (Max):
- 5 mA
- Voltage - On State (Vtm) (Max):
- 1.6 V
- Current - On State (It (AV)) (Max):
- 7.6 A
- Current - On State (It (RMS)) (Max):
- 12 A
- Current - Hold (Ih) (Max):
- 20 mA
- Current - Off State (Max):
- 5 µA
- Current - Non Rep. Surge 50, 60Hz (Itsm):
- 120A, 126A
- SCR Type:
- Standard Recovery
- Operating Temperature:
- -40°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220
TN1205H-6T FAQ
1.How can I place an order for TN1205H-6T through Aetrix?
Please submit a Request for Quotation (RFQ) for TN1205H-6T 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 TN1205H-6T reliable?
The price and inventory of TN1205H-6T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TN1205H-6T is usually 5 days.
3.What payment methods are accepted for TN1205H-6T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TN1205H-6T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TN1205H-6T?
TN1205H-6T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TN1205H-6T 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 TN1205H-6T?
For technical support, including TN1205H-6T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TN1205H-6T requirements.
6.How does Aetrix verify that TN1205H-6T is sourced from the original manufacturer or authorized distributors?
All TN1205H-6T 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 TN1205H-6T meets industry standards.
7.What is the process for return or replacement of TN1205H-6T?
All TN1205H-6T units undergo pre-shipment inspection (PSI). If there is an issue with TN1205H-6T, 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 TN1205H-6T part is unused and in its original packaging.
Return procedure for TN1205H-6T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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