STMicroelectronics T1620T-8G

Overview

T1620T-8G from STMicroelectronics is a snubberless, three-quadrant Triac in D²PAK package rated for 16 A RMS on-state current, 800 V repetitive peak off-state voltage (VDRM/VRRM), and 900 V non-repetitive surge voltage (VDSM/VRSM), with 20 mA gate trigger current (IGT). It delivers high commutation robustness (dl/dt)_c ≥ 4.5 A/ms at 150 °C and static dV/dt immunity ≥ 500 V/µs at T_j = 150 °C, enabling reliable phase-angle control in AC motor drives and heating circuits without external snubbers.

For engineers reviewing the T1620T-8G datasheet, T1620T-8G pinout, T1620T-8G application, or T1620T-8G equivalent, this device supports high-temperature switching up to 150 °C junction, offers low on-state resistance (R_D = 34 mΩ at 150 °C), and provides validated thermal performance with R_th(j–c) = 1.15 °C/W - critical for thermally constrained SMD designs in home appliance power stages.

Technical Context

The T1620T-8G implements a three-quadrant Triac architecture supporting triggering in Quadrants I, II, and III, with gate sensitivity guaranteed ≤20 mA across all quadrants at 25 °C and ≤45 mA in QIII at 150 °C. Its high (dl/dt)_c (≥6 A/ms at 125 °C) and dV/dt immunity (≥1000 V/µs at 125 °C) are achieved via optimized silicon structure and gate layout, enabling robust turn-off under inductive load transients.

Thermal design is enabled by its insulated D²PAK package with non-insulated metal tab, delivering R_th(j–c) = 1.15 °C/W and allowing direct heatsinking. The device operates across –40 to +150 °C junction temperature, with V_DRM/V_RRM derated to 600 V above 125 °C - a key constraint for continuous operation in enclosed thermal environments.

Key Specifications

Pinout & Package

D²PAK (TO-263) package with exposed metal tab (A2) for thermal conduction and electrical connection; UL 94 V0 flammability rating; RoHS and halogen-free (Ecopack2).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Triac switching applications.

Compared with BTB16-800CW and T1635T-8G, the T1620T-8G uniquely balances low gate drive (20 mA), full three-quadrant operation, and verified high-temperature commutation (≥4.5 A/ms at 150 °C), making it optimal for compact, thermally demanding AC control where gate drive resources and thermal margin are constrained.

Availability

T1620T-8G is available at Aetrix Electronics and suitable for motor control, heating regulation, lighting dimming, and overvoltage protection applications requiring stable component supply, high-temperature reliability, and snubberless AC switching capability.

Supply support for T1620T-8G 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, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.

The T1620T-8G belongs to ST's Snubberless™ Triac product line, engineered specifically for high-reliability, high-temperature AC power control in space-constrained SMD applications where thermal efficiency and gate-drive simplicity are critical.

FAQ

Is the T1620T-8G truly snubberless in all applications?

No - snubberless operation is conditional. It is validated only when applied (dl/dt)c and dV/dt limits (e.g., ≤4.5 A/ms and ≤500 V/µs at 150 °C) are met per the datasheet's "Snubberless Operation" section. Inductive loads exceeding these values require an RC snubber to prevent commutation failure or false turn-on.

What is the maximum allowable case temperature for continuous 16 A RMS operation?

The datasheet specifies T_c = 126 °C as the maximum case temperature for full 16 A RMS current (Table 1). Exceeding this requires linear derating per Figure 2; at T_c = 135 °C, IT(RMS) drops to ~14.5 A. Thermal design must ensure case-to-ambient path sustains ≤126 °C under worst-case ambient and airflow.

Can the metal tab (A2) be electrically connected to chassis ground?

Only if isolation requirements permit - the tab is internally connected to A2 and is not electrically isolated. For Class I appliances or grounded systems, direct tab-to-chassis connection is acceptable and improves thermal performance. For Class II (double-insulated) systems, the tab must be fully insulated per safety standards (e.g., IEC 60335).

How does the T1620T-8G compare to standard Triacs in terms of gate drive compatibility?

Its 20 mA max IGT at 25 °C matches industry-standard Triac drivers (e.g., MOC302x optocouplers), but gate sensitivity degrades with temperature: IGT rises to ~35 mA at 150 °C (Figure 5). Designs must ensure gate driver sustains ≥35 mA peak at max operating temperature, especially in QIII where IL is highest (55 mA).