STMicroelectronics TS1220-700B

Overview

TS1220-700B from STMicroelectronics is a sensitive-gate 12 A silicon-controlled rectifier (SCR) with 700 V repetitive peak off-state voltage (V_RRM), 200 µA maximum gate trigger current (I_GT), and 1.6 V on-state voltage (V_TM) at 24 A. It is designed for low-power gate drive applications including crowbar overvoltage protection, inrush current limiting, and capacitive discharge ignition circuits in power tools and kitchen appliances.

For engineers reviewing the TS1220-700B datasheet, TS1220-700B pinout, TS1220-700B application, or TS1220-700B equivalent, key selection considerations include its ultra-low I_GT sensitivity, DPAK surface-mount package thermal performance (R_th(j-c) = 1.3 °C/W), and dV/dt immunity of ≥5 V/µs at T_j = 125 °C with R_GK = 220 Ω.

Technical Context

The TS1220-700B operates as a unidirectional thyristor with latching behavior triggered by a low-energy gate pulse. Its sensitive gate enables direct drive from microcontrollers or optocouplers without external amplification, supported by guaranteed I_GT ≤ 200 µA at V_D = 12 V and R_L = 140 Ω.

It features a dynamic resistance (R_d) ≤ 30 mΩ and threshold voltage (V_t0) ≤ 0.85 V at T_j = 125 °C, ensuring low conduction loss. Thermal design is enabled by its DPAK package's 1.3 °C/W junction-to-case resistance and validated 12 A RMS current rating at T_c = 105 °C.

Key Specifications

Pinout & Package

TS1220-700B uses the DPAK (TO-252) surface-mount package: three terminals-Anode (A), Cathode (K), and Gate (G)-with exposed tab electrically connected to the Anode and thermally coupled to PCB copper for heat transfer.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TS1220-600B, the -700B adds 100 V blocking headroom critical for 230 V AC applications; compared with TS1220-800B, it offers optimal cost-performance balance where 700 V suffices for safety margins without over-specifying.

Availability

TS1220-700B is available at Aetrix Electronics and suitable for overvoltage protection, inrush limiting, and phase-controlled motor drives requiring stable component supply across industrial, appliance, and power tool manufacturing.

Supply support for TS1220-700B 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 TS1220 belongs to ST's high-reliability SCR product line, engineered specifically for robust, low-power-gate AC power control in cost-sensitive, space-constrained applications such as white goods and portable power equipment.

FAQ

What is the maximum junction temperature for continuous operation?

The TS1220-700B has an operating junction temperature range of –40 °C to +125 °C. Continuous conduction at rated I_T(RMS) = 12 A requires case temperature ≤105 °C, verified per Table 2 absolute ratings. Exceeding 125 °C risks irreversible parametric shift or latch-up failure.

Can TS1220-700B be driven directly from a 3.3 V microcontroller GPIO?

Yes - with appropriate current-limiting resistor. At V_D = 3.3 V and R_L = 140 Ω, gate current reaches ~16 mA, far exceeding the 200 µA I_GT max. A 10 kΩ series resistor limits peak gate current to ~330 µA, well within safe PG(AV) = 1 W and I_GM = 4 A limits.

Is heatsinking required for 12 A RMS operation?

Yes - mandatory. With R_th(j-c) = 1.3 °C/W and P_cond ≈ I² × R_d ≈ 144 × 0.03 = 4.3 W, junction temperature rise above case is ~5.6 °C. To hold T_j ≤ 125 °C at T_c = 105 °C, case-to-ambient thermal resistance must be ≤15.4 °C/W - achievable only with ≥2 cm² copper pour or external heatsink.

Does TS1220-700B support bidirectional current flow?

No - it is a unidirectional SCR. It conducts only from Anode to Cathode when forward-biased and triggered. For AC line control, two SCRs must be connected in inverse-parallel, or a TRIAC (e.g., ST's BT139 series) should be selected instead.