STMicroelectronics TN1215-800H

Overview

TN1215-800H from STMicroelectronics is a standard 12 A, 800 V repetitive peak off-state voltage (VDRM/VRRM) silicon-controlled rectifier (SCR) in IPAK package, with 15 mA maximum gate trigger current (IGT), designed for phase-controlled AC power switching in motor control, overvoltage crowbar protection, and inrush limiting circuits.

For engineers reviewing the TN1215-800H datasheet, TN1215-800H pinout, TN1215-800H application, or TN1215-800H equivalent, key selection criteria include RMS on-state current rating (12 A), thermal resistance junction-to-case (1.3 °C/W), non-repetitive surge capability (115 A @ 8.3 ms), and gate sensitivity (15 mA IGT at 12 V).

Technical Context

This SCR operates as a unidirectional latching switch triggered by a positive gate pulse relative to cathode, sustaining conduction until load current falls below holding current (IH ≤ 40 mA). It features a dynamic on-state resistance (Rd ≤ 30 mΩ) and threshold voltage (Vto ≤ 0.85 V) at 125 °C, enabling low conduction losses in high-current AC line applications.

Designed for 50/60 Hz mains operation, it supports critical dV/dt immunity (≥200 V/µs at 125 °C, gate open) and exhibits robust surge tolerance (I²t = 60 A²s for fusing), validated under Tj = 25 °C initial conditions with sinusoidal 8.3 ms pulses.

Key Specifications

Pinout & Package

The TN1215-800H is housed in an IPAK (TO-251AA) surface-mount package with three terminals: anode (A), cathode (K), and gate (G). The package features a single exposed metal tab (anode-connected) for thermal and electrical mounting, requiring mechanical torque of 0.4–0.6 N·m when screwed to heatsink.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar SCR-based AC power switching applications.

Compared with TYN812RG and TN1215-800B-TR, the TN1215-800H offers identical voltage/current ratings and gate sensitivity in an IPAK package-providing superior thermal interface via screw-mounted tab while occupying less PCB area than TO-220AB and offering higher thermal mass than DPAK for sustained 12 A operation.

Availability

TN1215-800H is available at Aetrix Electronics and suitable for motor control in power tools, overvoltage crowbar protection, and inrush current limiting circuits requiring stable component supply, long-term industrial lifecycle support, and RoHS-compliant packaging.

Supply support for TN1215-800H 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, delivering innovative solutions across automotive, industrial, and power management domains with strong focus on reliability and environmental compliance.

The TN1215 series belongs to ST's standard SCR product line, engineered specifically for robust, cost-effective AC power control in industrial and consumer equipment where predictable latching behavior, surge resilience, and thermal stability are essential.

FAQ

What is the maximum junction temperature for continuous operation of TN1215-800H?

The maximum operating junction temperature is +125 °C, as specified in Table 2 of the datasheet. This rating applies under DC or 180° conduction conditions with case temperature maintained at or below 110 °C. Exceeding this temperature risks parametric shift and accelerated wear-out; thermal design must ensure Rth(j-c) × Pdiss + Tc ≤ 125 °C.

Can TN1215-800H be used in bidirectional AC switching applications?

No-it is a unidirectional SCR and conducts only from anode to cathode. For full-wave AC control, two TN1215-800H devices must be connected in inverse-parallel (anode-to-anode or cathode-to-cathode), or a dedicated triac such as the BT139-600 should be selected instead.

What gate drive circuitry is recommended for reliable triggering?

A pulse source capable of delivering ≥15 mA peak current into a 33 Ω load at ≥12 V is required, per test condition in Table 3. Use a series resistor (e.g., 220 Ω) with a 15–24 V DC source or transformer-coupled pulse generator, and include local 100 nF ceramic decoupling at the gate-cathode terminals to suppress noise-induced false triggering.

Is the IPAK package of TN1215-800H electrically insulated from the heatsink?

No-the anode is internally connected to the exposed metal tab, making it electrically live. When mounted to a heatsink, the heatsink must be isolated from system ground unless the anode circuit is referenced to chassis ground. Use insulating shoulder washers and mica or polymer thermal pads rated for ≥800 V isolation if galvanic separation is required.