STMicroelectronics SM6T220CA

Overview

SM6T220CA from STMicroelectronics is a bidirectional transient voltage suppression (TVS) diode designed for high-energy surge protection on power and signal lines. It delivers 600 W peak pulse power (10/1000 µs), clamps transients to 328 V at 2 A, operates up to 150 °C junction temperature, and features low leakage (<1 µA at 85 °C), making it suitable for industrial power supplies and telecom line interfaces.

For engineers reviewing the SM6T220CA datasheet, SM6T220CA pinout, SM6T220CA application, or SM6T220CA equivalent, key selection criteria include its 220 V standoff voltage, bidirectional clamping behavior, SMB package thermal performance, and IEC 61000-4-2/4-4 level 4 compliance for ESD and surge immunity in harsh environments.

Technical Context

This TVS diode uses planar silicon technology to achieve stable breakdown characteristics across temperature, with a typical dynamic resistance of 15.2 Ω at 8/20 µs pulses and a temperature coefficient α_T of 10.8 × 10⁻⁴/°C for V_BR drift. Its bidirectional structure enables symmetrical clamping on AC-coupled or floating lines without polarity constraints.

The device meets UL497B recognition as an isolated loop circuit protector (file E136224), supports JEDEC-standard SMB footprint, and maintains ≤0.2 µA leakage at 25 °C - critical for low-power monitoring circuits where standby current must remain minimal.

Key Specifications

Pinout & Package

SM6T220CA is housed in an SMB (DO-214AA) surface-mount package measuring 3.3–3.95 mm × 5.1–5.6 mm × 1.9–2.45 mm (L × W × H), with matte tin-plated leads compliant to J-STD-002 and MIL-STD-750 Method 2026.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bidirectional TVS diode applications.

Compared with SMBJ220CA and P6SMB220CA, SM6T220CA offers superior thermal stability (350 W at T_j = 150 °C), lower leakage, and UL497B certification - making it the preferred choice for safety-critical, high-reliability industrial and telecom applications requiring documented isolation barrier compliance.

Availability

SM6T220CA is available at Aetrix Electronics and suitable for industrial power input protection, telecom line interface, AC-DC adapter secondary side, and motor drive control board applications requiring stable component supply and long-term lifecycle support.

Supply support for SM6T220CA 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, specializing in power management, analog, MEMS, and microcontrollers for industrial, automotive, and consumer markets.

The SM6T series belongs to ST's transient protection portfolio, engineered specifically for high-reliability surge suppression in industrial automation, telecom infrastructure, and power conversion systems where low leakage, high T_j capability, and safety certifications are mandatory.

FAQ

Is SM6T220CA unidirectional or bidirectional?

SM6T220CA is a bidirectional TVS diode, indicated by the "CA" suffix per ST's naming convention. Its symmetrical breakdown characteristic allows it to clamp positive and negative transients equally - ideal for AC lines, differential data interfaces, and floating grounds where polarity cannot be assumed.

What is the maximum clamping voltage at 10 A for SM6T220CA?

Per Table 2 in DS0684 Rev 15, the clamping voltage (V_CL) for SM6T220CA is specified at 2 A (328 V, 10/1000 µs). Extrapolation to 10 A is not provided in the datasheet; actual V_CL at 10 A would depend on dynamic resistance and pulse shape, and must be verified experimentally or via SPICE simulation using the published RD = 15.2 Ω value.

Does SM6T220CA meet RoHS and REACH requirements?

Yes - SM6T220CA is manufactured in ST's ECOPACK2-compliant facilities and conforms to RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. Full material declarations and compliance certificates are available through ST's quality portal upon request with valid order information.

Can SM6T220CA replace SM6T220A in a design?

No - SM6T220A is unidirectional and will conduct continuously if reverse-biased beyond its V_RWM, potentially causing failure. SM6T220CA is bidirectional and safe for AC or polarity-agnostic use. Substitution requires verifying circuit topology: only use SM6T220CA where symmetrical clamping is needed or where polarity is undefined.