May 28, 2025
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In today's rapidly evolving electronics market, the demand for reliable high-voltage switching components continues to grow. The TN815-800H from STMicroelectronics stands out as a premier solution, offering 800V blocking voltage and 8A RMS current capacity in a compact IPAK (TO-251) package. Ideal for industrial controls, power management, and consumer electronics, this thyristor combines high surge current tolerance (70A) with low gate trigger current (15mA max). Whether you're upgrading legacy systems or designing new power circuits, the TN815-800H delivers the performance and durability needed for harsh environments. Read on to explore its technical advantages and application potential.
The TN815-800H is a standard recovery unidirectional thyristor (SCR) designed for medium-power AC switching applications. Its robust construction and wide operating temperature range (-40°C to 125°C) make it suitable for demanding industrial environments.
| Parameter | Value | Significance |
|---|---|---|
| Off-State Voltage (VDRM) | 800V | High voltage tolerance for industrial mains applications |
| On-State Current (IT(RMS)) | 8A | Handles typical appliance and motor loads |
| Gate Trigger Current (IGT) | 15mA max | Low drive requirement simplifies control circuits |
| Surge Current (ITSM) | 70A (50Hz) | Withstands inrush currents during fault conditions |
| On-State Voltage Drop (VTM) | 1.6V max | Low conduction losses improve efficiency |
When choosing the TN815-800H for your design:
Voltage Rating: Ensure 800V meets your application's peak voltage requirements with margin
Current Capacity: 8A RMS suits most appliance controls; derate for high ambient temperatures
Package: IPAK (TO-251) offers better thermal performance than TO-92 for similar currents
Gate Drive: Verify your control circuit can provide ≥15mA trigger current
1. Industrial Motor Controls: Used in 400VAC 3-phase systems for soft-start circuits, protecting motors from current surges.
2. Home Appliances: Relays replacement in washing machine controllers, handling inductive loads safely.
3. Lighting Systems: Dimming circuits for high-power incandescent/halogen lamps in stage lighting.
According to industry reports, the global thyristor market is projected to grow at 5.2% CAGR from 2023-2030, driven by industrial automation and energy-efficient appliances. The TN815-800H addresses key trends:
Demand for ROHS-compliant components (certified in this product)
Need for higher voltage ratings in compact packages
Preference for standard recovery devices in cost-sensitive applications
While silicon-based thyristors like the TN815-800H remain dominant, emerging wide-bandgap (SiC/GaN) devices may challenge high-end applications. However, for mainstream industrial uses below 1000V, this component's cost-performance ratio ensures continued relevance through at least 2030.
| Model | VDRM | IT(RMS) | Package | Key Differentiator |
|---|---|---|---|---|
| TN815-800H | 800V | 8A | TO-251 | Best cost-performance for 5-8A applications |
| BT151-800R | 800V | 12A | TO-220 | Higher current but larger footprint |
| TIC226M | 600V | 8A | TO-220 | Lower voltage rating, obsolete package |
Why choose TN815-800H? It offers the optimal balance of voltage rating, current capacity, and compact packaging for space-constrained designs requiring 800V blocking.
Q1: Can the TN815-800H handle 240VAC mains applications?
A: Yes, its 800V rating provides sufficient margin for 240VAC systems (340V peak).
Q2: What heatsink is recommended for 5A continuous operation?
A: A 5°C/W TO-251 heatsink maintains safe junction temperatures at 5A (per ST AN2348).
Q3: Is this suitable for DC switching applications?
A: As a thyristor, it latches on with DC; ensure proper turn-off circuitry is implemented.
Q4: How does it compare to TRIACs for AC control?
A: Unidirectional conduction simplifies gate drive but requires two devices for full AC control.
Q5: What's the typical lifespan in switching applications?
A: >100,000 cycles at rated current when operated within thermal limits (ST reliability data).
The TN815-800H represents STMicroelectronics' commitment to delivering robust thyristor solutions for industrial and consumer electronics. With its 800V blocking capability, 8A current rating, and compact IPAK package, this component solves critical design challenges in power control applications. As industries continue demanding higher efficiency and reliability, the TN815-800H's proven performance makes it a smart choice for your next project.
For pricing, samples, or technical support, contact our component specialists at [email protected].
