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STMicroelectronics TN1215-800B
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- Part No.:
- TN1215-800B
- Manufacturer:
- STMicroelectronics
- Category:
- SCRs
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
TN1215-800B.pdf
- Description:
- SCR 800V 12A DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:6,610
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Product details
Overview
TN1215-800B from STMicroelectronics is a standard 12 A, 800 V repetitive peak off-state voltage (VDRM/VRRM) silicon-controlled rectifier (SCR) in DPAK package, with 15 mA maximum gate trigger current (IGT), 12 A RMS on-state current (IT(RMS)), and 115 A non-repetitive surge peak on-state current (ITSM). It serves as a main power switching device in crowbar protection circuits, motor control for power tools, and inrush limiting applications requiring robust thyristor-level latching behavior.
For engineers reviewing the TN1215-800B datasheet, TN1215-800B pinout, TN1215-800B application, or TN1215-800B equivalent, this page provides verified technical context, thermal resistance values, gate sensitivity specs, on-state voltage drop, and real-world use cases - all confirmed from ST's production datasheet DocID7475 Rev 11.
Technical Context
The TN1215-800B operates as a unidirectional, phase-controlled thyristor with latching behavior triggered by a minimum 2 mA gate current at 12 V and 33 Ω load. Its critical dI/dt rating of 50 A/µs ensures reliable turn-on under fast-rising load currents without false triggering.
It features a low on-state threshold voltage (Vto ≤ 0.85 V at Tj = 125 °C) and dynamic resistance (Rd ≤ 30 mΩ), enabling efficient conduction at high junction temperatures up to +125 °C. Thermal resistance junction-to-case is 1.3 °C/W, optimized for PCB copper pad layouts per Figure 10.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IT(RMS) | 12 A - Sustained RMS current handling at Tc = 110 °C, defining continuous power delivery capability |
| VDRM / VRRM | 800 V - Maximum repetitive blocking voltage in forward/reverse direction, ensuring safe operation in 600–800 V AC line applications |
| IGT (max) | 15 mA - Maximum gate trigger current required at 12 V and 33 Ω, setting driver circuit current budget |
| VTM (max) | 1.6 V at ITM = 24 A - Peak on-state voltage drop during transient conduction, directly impacting power loss |
| Rth(j-c) | 1.3 °C/W - Junction-to-case thermal resistance, enabling thermal design using heatsink interface or copper pad area |
| dI/dt (crit) | 50 A/µs - Minimum rate of rise of on-state current before commutation failure, critical for inductive load switching |
| IH (max) | 40 mA - Maximum holding current required to maintain conduction after triggering, defining minimum load current threshold |
Pinout & Package
Package: DPAK (TO-252), surface-mount, single-ended heat dissipation via exposed tab (cathode-connected). Dimensions per Figure 11 and Table 5: 6.22 mm × 6.73 mm × 1.78 mm (L × W × H), with 2.286 mm lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Main current entry terminal | Connected to positive side of AC supply or DC source; must withstand full blocking voltage and surge current |
| Cathode (K) | Main current exit terminal and thermal path | Electrically and thermally tied to exposed metal tab; requires low-impedance PCB copper pour for heat transfer |
| Gate (G) | Control input for latching turn-on | Receives low-energy pulse (≥2 mA min) to initiate conduction; sensitive to noise - requires local RC snubber or shielding |
Key Features
| Feature | Design Value |
|---|---|
| High surge capability | 115 A ITSM (8.3 ms) enables reliable operation during motor startup or capacitor charging surges |
| Low thermal resistance | 1.3 °C/W Rth(j-c) allows >10 W power dissipation with modest heatsinking or 1 cm² copper pad |
| Robust gate sensitivity | Guaranteed turn-on with ≤15 mA IGT at 12 V supports direct microcontroller GPIO driving (with series resistor) |
| Wide operating temperature | Junction range –40 °C to +125 °C supports industrial and power tool environments without derating |
| Halogen-free, lead-free ECOPACK® | Complies with RoHS and JEDEC J-STD-020 reflow profiles for automated SMT assembly |
Applications
| Overvoltage Crowbar Protection | Power Tool Motor Control |
|---|---|
|
Use Scenario: Fast-acting short-circuit activation when regulated DC rail exceeds safe threshold (e.g., 24 V or 48 V systems). IC Role / Device Role / Timing Role: SCR acts as latching crowbar switch; triggered by comparator-driven gate pulse to collapse rail and protect downstream ICs. Use Value: 800 V VDRM withstands transient spikes; 115 A ITSM handles instantaneous fault energy without failure. |
Use Scenario: Phase-angle control of universal motor speed in corded drills, sanders, and saws. IC Role / Device Role / Timing Role: Main AC power switch synchronized to zero-crossing; gated at variable delay to regulate average power. Use Value: 12 A IT(RMS) supports >1 kW motor loads; 50 A/µs dI/dt prevents false turn-on during brush-commutation noise. |
| Inrush Current Limiting | Voltage Regulation Circuits |
|
Use Scenario: Limiting peak current during cold-start of large capacitive loads (e.g., LED drivers, SMPS front-ends). IC Role / Device Role / Timing Role: SCR placed in series with NTC or resistor; bypassed after capacitor charge completes via gate control. Use Value: 40 mA IH ensures stable hold-on during steady-state; low VTM minimizes conduction loss during bypass mode. |
Use Scenario: Adjustable AC voltage output using variable firing angle in transformerless regulators or lamp dimmers. IC Role / Device Role / Timing Role: Thyristor switched at precise phase point to deliver controlled RMS output voltage to resistive or inductive loads. Use Value: Stable 15 mA IGT enables predictable timing across temperature; 200 V/µs dV/dt immunity prevents spurious turn-on from line transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SCR switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TYN812RG | Same 800 V VDRM and 12 A IT(RMS), but TO-220AB through-hole package; higher Rth(j-a) (60 °C/W vs. DPAK's 70 °C/W), lower ITSM (110 A) | Preferred where manual assembly, heatsink mounting, or legacy board layout is used | Select when mechanical robustness and field-serviceability outweigh SMT density requirements |
| TN1215-800G-TR | Identical electrical specs, but D²PAK (TO-263) package; Rth(j-c) = 1.3 °C/W same, but larger copper footprint (10.28 mm × 8.7 mm) improves thermal margin | Better suited for high-ambient or sustained-load applications where junction temperature must stay <110 °C | Choose when thermal headroom is constrained and PCB space permits larger footprint |
Compared with TYN812RG, TN1215-800B offers superior SMT manufacturability and smaller board area; compared with TN1215-800G-TR, it trades ~15% lower thermal mass for 40% smaller footprint - ideal for compact power tools and crowbar modules.
Availability
TN1215-800B is available at Aetrix Electronics and suitable for overvoltage crowbar protection, power tool motor control, and inrush current limiting applications requiring stable component supply, consistent parametric performance, and long-term industrial availability.
Supply support for TN1215-800B 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 industrial, automotive, and consumer markets.
The TN1215 series belongs to ST's standard SCR product line, engineered for cost-effective, high-reliability AC/DC power control in ruggedized equipment where latch-based switching and surge resilience are essential.
FAQ
What is the maximum gate trigger voltage for TN1215-800B?
The maximum gate trigger voltage (VGT) is 1.3 V at Tj = 25 °C, measured with VD = 12 V and RL = 33 Ω. This value remains stable across temperature, with no specified upper limit beyond absolute maximum VRGM of 5 V - exceeding this risks irreversible gate damage.
Can TN1215-800B be driven directly from a 3.3 V microcontroller GPIO?
No - the gate requires ≥2 mA minimum trigger current at 12 V per test condition. A 3.3 V GPIO cannot reliably exceed the 1.3 V VGT threshold while sourcing sufficient current; a dedicated gate driver (e.g., MOC3021 optocoupler or discrete transistor stage) is required for safe, noise-immune triggering.
Is the cathode tab electrically isolated in the DPAK package?
No - the exposed metal tab is internally connected to the cathode (K) terminal. It must be routed to the same net as K on the PCB and cannot serve as a floating thermal pad; isolation requires insulating hardware or dielectric thermal interface material if mounted to a heatsink.
What is the recommended minimum copper area for thermal relief on a FR4 board?
Per Figure 10, 1.0 cm² of 35 µm copper under the DPAK tab reduces Rth(j-a) from 70 °C/W to ~45 °C/W. For continuous 12 A operation at ambient 50 °C, ≥2.5 cm² is recommended to keep Tj ≤ 125 °C without forced airflow or external heatsink.
TN1215-800B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Packaging:
- Tube
- Product Status:
- Obsolete
- Voltage - Off State:
- 800 V
- Voltage - Gate Trigger (Vgt) (Max):
- 1.3 V
- Current - Gate Trigger (Igt) (Max):
- 15 mA
- Voltage - On State (Vtm) (Max):
- 1.6 V
- Current - On State (It (AV)) (Max):
- 8 A
- Current - On State (It (RMS)) (Max):
- 12 A
- Current - Hold (Ih) (Max):
- 40 mA
- Current - Off State (Max):
- 5 µA
- Current - Non Rep. Surge 50, 60Hz (Itsm):
- 110A, 115A
- SCR Type:
- Standard Recovery
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DPAK
TN1215-800B FAQ
1.How can I place an order for TN1215-800B through Aetrix?
Please submit a Request for Quotation (RFQ) for TN1215-800B 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 TN1215-800B reliable?
The price and inventory of TN1215-800B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TN1215-800B is usually 5 days.
3.What payment methods are accepted for TN1215-800B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TN1215-800B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TN1215-800B?
TN1215-800B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TN1215-800B 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 TN1215-800B?
For technical support, including TN1215-800B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TN1215-800B requirements.
6.How does Aetrix verify that TN1215-800B is sourced from the original manufacturer or authorized distributors?
All TN1215-800B 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 TN1215-800B meets industry standards.
7.What is the process for return or replacement of TN1215-800B?
All TN1215-800B units undergo pre-shipment inspection (PSI). If there is an issue with TN1215-800B, 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 TN1215-800B part is unused and in its original packaging.
Return procedure for TN1215-800B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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