STMicroelectronics TS820-700B-TR

Overview

TS820-700B-TR from STMicroelectronics is a sensitive-gate 8 A, 700 V RMS silicon-controlled rectifier (SCR) in DPAK surface-mount package, with maximum gate trigger current of 200 µA and on-state voltage drop of 1.6 V at 16 A, designed for overvoltage crowbar protection and inrush current limiting in power tools and kitchen appliances.

For engineers reviewing the TS820-700B-TR datasheet, TS820-700B-TR pinout, TS820-700B-TR application, or TS820-700B-TR equivalent, key selection criteria include sensitive gate drive compatibility (≤200 µA), 700 V blocking capability, thermal resistance (R_th(j-c) = 1.3 °C/W), DPAK footprint constraints, and crowbar response time under transient overvoltage conditions.

Technical Context

This SCR operates in forward-conducting mode only, triggered by low-current gate pulses (IGT ≤ 200 µA at 12 V), with latching behavior confirmed by holding current ≤5 mA and latching current ≤6 mA. Its dV/dt immunity exceeds 5 V/µs at 125 °C with 220 Ω gate-cathode resistor, enabling reliable operation in noisy AC line environments.

Thermal design relies on junction-to-case conduction (1.3 °C/W) through the DPAK tab, requiring copper pad area ≥0.5 cm² for ambient-rated current derating. The device exhibits threshold voltage (V_t0) ≤0.85 V and dynamic resistance (R_d) ≤46 mΩ at 125 °C, defining its conduction loss profile under pulsed and continuous loads.

Key Specifications

Pinout & Package

DPAK (TO-252) package with exposed cathode tab for thermal and electrical connection; 3-terminal configuration optimized for surface-mount assembly and PCB-level heat dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TS820-600B-TR, the -700B-TR adds 100 V blocking headroom for 230 V AC designs with tighter margins; versus TS820-800B-TR, it trades 100 V overhead for lower conduction losses and tighter parameter distribution in mid-range applications.

Availability

TS820-700B-TR is available at Aetrix Electronics and suitable for overvoltage crowbar protection, inrush current limiting, and capacitive discharge ignition requiring stable component supply and consistent parametric performance across production batches.

Supply support for TS820-700B-TR 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, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.

The TS820 series belongs to ST's high-sensitivity SCR product line, engineered specifically for low-power gate drive and fast-response protection circuits in space-constrained, cost-sensitive power electronics.

FAQ

What is the maximum junction temperature for continuous operation?

The TS820-700B-TR has an operating junction temperature range of –40 °C to +125 °C. For continuous RMS current at 8 A, case temperature must be maintained ≤110 °C per absolute ratings table; thermal design must ensure R_th(j-a) and PCB copper area limit T_j within this bound under worst-case ambient and airflow conditions.

Can this SCR be driven directly by a 3.3 V microcontroller GPIO?

Yes - with appropriate current-limiting resistor. At 3.3 V and 200 µA max IGT, a 10 kΩ series resistor delivers ~330 µA, well above threshold. However, layout must minimize gate loop area and add RC snubber (e.g., 100 Ω + 100 nF) to suppress EMI-induced false triggering in noisy environments.

Is the DPAK tab electrically isolated from the cathode?

No - the DPAK tab is internally connected to the cathode (K) terminal. This is confirmed by mechanical drawings and thermal test conditions specifying R_th(j-c) measurement between junction and cathode metal tab. PCB layout must treat the tab as cathode potential and avoid isolation gaps unless external insulation is added.

Does this part meet RoHS and REACH requirements?

Yes - TS820-700B-TR is manufactured in ST's ECOPACK-compliant DPAK package: halogen-free molding compound meeting UL94 V0, lead-free plating, and fully compliant with EU RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. Full compliance documentation is available in ST's ECOPACK database at www.st.com/ecopack.