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STMicroelectronics TYN840RG
- Part No.:
- TYN840RG
- Manufacturer:
- STMicroelectronics
- Category:
- SCRs
- Package:
- TO-220-3
- Datasheet:
-
TYN840RG.pdf
- Description:
- SCR 800V 40A TO220AB
- Quantity:
- Payment:
- Shipping:
Inventory:170
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Product details
Overview
TYN840RG from STMicroelectronics is a 40 A, 800 V standard silicon-controlled rectifier (SCR) in TO-220AB package, with 35 mA gate trigger current and 480 A non-repetitive surge capability. It serves as a high-surge crowbar switch in overvoltage protection circuits for industrial power supplies and solid-state relays operating in back-to-back AC switching configurations.
For engineers reviewing the TYN840RG datasheet, TYN840RG pinout, TYN840RG application, or TYN840RG equivalent, key selection criteria include repetitive peak off-state voltage (800 V), on-state RMS current (40 A), critical dI/dt rating (50 A/µs), thermal resistance (0.8 °C/W junction-to-case), and gate sensitivity (35 mA IGT).
Technical Context
This SCR uses planar passivated junction technology and clip-bonded internal construction to sustain high surge currents (480 A, 8.3 ms) without latch-up. Its gate-triggering threshold is tightly specified (≤35 mA at 12 V), and it maintains stable latching (≤150 mA IL) and holding (≤75 mA IH) behavior across –40 °C to +125 °C junction temperature.
The device exhibits robust dynamic performance: minimum dV/dt of 1000 V/µs at 125 °C prevents false turn-on under fast transients, while on-state voltage is limited to 1.6 V at 80 A, supporting low conduction losses in high-power motor control and welding equipment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IT(RMS) | 40 A - Sustains continuous AC load current in 180° conduction mode at 95 °C case temperature |
| VDRM / VRRM | 800 V - Blocks bidirectional 800 V peak off-state voltage before triggering, enabling use in 380–480 VAC systems |
| IGT | 35 mA max - Gate drive compatible with standard logic-level drivers and optocouplers without amplification |
| ITSM (tp = 8.3 ms) | 480 A - Withstands single-cycle short-circuit surges common in motor startup and welder arc initiation |
| dI/dt (critical) | 50 A/µs - Resists rapid current rise during turn-on, avoiding localized hot-spot failure |
| Rth(j-c) | 0.8 °C/W - Enables efficient heat transfer to heatsink; supports 40 A operation with ≤32 °C temperature rise at 40 W dissipation |
| VTM (80 A) | 1.6 V max - Limits conduction loss to ≤128 W at full surge, reducing thermal stress in crowbar applications |
Pinout & Package
TYN840RG is housed in a TO-220AB package with isolated mounting tab (non-conductive backside), epoxy meeting UL94 V0, and lead-free finish compliant with ECOPACK® standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Main current entry terminal | Connected to high-side AC line or DC bus; carries full load and surge current |
| Cathode (K) | Main current exit terminal | Connected to load return or neutral; forms main conduction path with Anode |
| Gate (G) | Trigger control input | Receives low-energy pulse (≥3.5 mA min, ≤35 mA max) to initiate conduction |
Key Features
| Feature | Design Value |
|---|---|
| High surge current rating | 480 A (8.3 ms) - Supports reliable operation in welding and motor inrush limiting without derating |
| Stable gate sensitivity | IGT ≤35 mA up to 125 °C - Ensures consistent triggering across industrial temperature range |
| Low on-state voltage | VTM ≤1.6 V at 80 A - Minimizes power loss and heatsink requirements in high-current crowbar circuits |
| High dV/dt immunity | ≥1000 V/µs at 125 °C - Prevents spurious turn-on from line transients in noisy industrial environments |
| Thermal robustness | Rth(j-c) = 0.8 °C/W - Allows direct mounting to heatsink with predictable thermal margin at 40 A RMS |
Applications
| Overvoltage Crowbar Protection | Solid-State Relay (Back-to-Back) |
|---|---|
Use Scenario: Fast-acting shunt protection triggered by voltage monitor IC when output exceeds safe threshold in regulated DC power supplies. IC Role / Device Role / Timing Role: SCR acts as sacrificial crowbar switch; conducts fully within microseconds upon gate pulse to short output and blow fuse. Use Value: 480 A surge rating ensures survival during fault clearing; 800 V blocking enables use in 400 VDC systems with margin. | Use Scenario: AC load switching in industrial HVAC controllers using two SCRs in inverse-parallel configuration. IC Role / Device Role / Timing Role: Each TYN840RG handles one half-cycle; gated at zero-crossing to minimize EMI and contact wear. Use Value: 40 A RMS rating supports 5.5 kW resistive loads at 230 VAC; 50 A/µs dI/dt prevents commutation failure. |
| Welding Equipment Control | High-Power Motor Starter |
Use Scenario: Primary current control in capacitor-discharge spot welders, where precise timing and high peak current are required. IC Role / Device Role / Timing Role: SCR gates capacitor bank discharge into welding transformer primary; triggered synchronously with process cycle. Use Value: 1.6 V VTM limits energy loss during 10–100 ms pulses; 480 A ITSM accommodates weld current peaks >300 A. | Use Scenario: In-rush current limiting for 30 kW induction motors during soft-start sequences in pump and compressor drives. IC Role / Device Role / Timing Role: SCR placed in series with stator winding; phased-fired to ramp voltage gradually over 2–5 seconds. Use Value: 40 A IT(RMS) sustains extended conduction; 0.8 °C/W Rth(j-c) enables stable thermal management during multi-second duty cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SCR-based protection and switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BT151-800R | 40 A IT(RMS), 800 V VDRM, but IGT = 15 mA (lower sensitivity); TO-220 package with conductive tab | Lower gate drive requirement suits microcontroller GPIO direct drive, but tab isolation requires insulating hardware | Prefer when gate drive is weak or space-constrained; verify heatsink isolation compatibility |
| IXYS Q8040LH | 40 A IT(RMS), 800 V VDRM, IGT = 50 mA (higher), Rth(j-c) = 1.0 °C/W (worse thermal) | Higher IGT demands stronger gate driver; lower surge rating (400 A) limits welder use | Choose only if ST's supply chain is constrained; expect higher gate power and reduced thermal headroom |
Compared with BT151-800R and IXYS Q8040LH, TYN840RG offers balanced gate sensitivity (35 mA), superior thermal resistance (0.8 °C/W), and highest surge rating (480 A), making it optimal for crowbar and high-dI/dt industrial switching where reliability under transient stress is critical.
Availability
TYN840RG is available at Aetrix Electronics and suitable for overvoltage crowbar protection, solid-state relay design, and high-power motor starter circuits requiring stable component supply and long-term industrial availability.
Supply support for TYN840RG 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.
TYN840RG belongs to ST's standard SCR product line, engineered specifically for ruggedized AC/DC power control in industrial equipment where high surge immunity, thermal stability, and gate drive simplicity are essential.
FAQ
What is the maximum junction temperature for continuous operation?
The TYN840RG has an operating junction temperature range of –40 °C to +125 °C. For continuous conduction at rated 40 A RMS, case temperature must be maintained at or below 95 °C per absolute ratings table, requiring adequate heatsinking to limit junction rise to ≤125 °C given Rth(j-c) = 0.8 °C/W.
Can TYN840RG be used in DC circuits?
Yes - TYN840RG functions in DC applications such as crowbar protection and DC motor field control. However, commutation must be externally managed (e.g., via auxiliary circuit or forced turn-off), as it lacks inherent DC self-commutation capability and relies on current interruption to reset.
Is the TO-220AB package electrically isolated?
Yes - the TO-220AB package used for TYN840RG features an electrically isolated mounting tab. The tab is connected to the cathode but insulated from the heatsink by default, allowing direct mechanical mounting without additional insulators unless system grounding requires further isolation.
What gate resistor value is recommended for reliable triggering?
A 33 Ω gate resistor is specified in the datasheet test condition (VD = 12 V, RL = 33 Ω). For robust triggering across temperature and unit variation, use 22–47 Ω with ≥12 V pulse amplitude to ensure ≥35 mA peak gate current while limiting IGM to ≤4 A per absolute rating.
TYN840RG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- Product Status:
- Active
- Voltage - Off State:
- 800 V
- Voltage - Gate Trigger (Vgt) (Max):
- 1.3 V
- Current - Gate Trigger (Igt) (Max):
- 35 mA
- Voltage - On State (Vtm) (Max):
- 1.6 V
- Current - On State (It (AV)) (Max):
- 25 A
- Current - On State (It (RMS)) (Max):
- 40 A
- Current - Hold (Ih) (Max):
- 75 mA
- Current - Off State (Max):
- 5 µA
- Current - Non Rep. Surge 50, 60Hz (Itsm):
- 460A, 480A
- SCR Type:
- Standard Recovery
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220
TYN840RG FAQ
1.How can I place an order for TYN840RG through Aetrix?
Please submit a Request for Quotation (RFQ) for TYN840RG 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 TYN840RG reliable?
The price and inventory of TYN840RG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TYN840RG is usually 5 days.
3.What payment methods are accepted for TYN840RG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TYN840RG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TYN840RG?
TYN840RG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TYN840RG 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 TYN840RG?
For technical support, including TYN840RG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TYN840RG requirements.
6.How does Aetrix verify that TYN840RG is sourced from the original manufacturer or authorized distributors?
All TYN840RG 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 TYN840RG meets industry standards.
7.What is the process for return or replacement of TYN840RG?
All TYN840RG units undergo pre-shipment inspection (PSI). If there is an issue with TYN840RG, 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 TYN840RG part is unused and in its original packaging.
Return procedure for TYN840RG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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