STMicroelectronics SMB6F14A

Overview

SMB6F14A from STMicroelectronics is a unidirectional 600 W transient voltage suppression (TVS) diode in SMB Flat package, designed to protect sensitive electronics against ESD and surge transients. It features a standoff voltage (VRM) of 14 V, clamping voltage (VCL) of 23.1 V at 26 A (10/1000 µs), and operates up to 175 °C junction temperature-ideal for automotive power line and industrial I/O port protection.

For engineers reviewing the SMB6F14A datasheet, SMB6F14A pinout, SMB6F14A application, or SMB6F14A equivalent, key selection criteria include clamping performance under 10/1000 µs surges, low leakage (<1 µA at 85 °C), flat SMB package height (1 mm), IEC 61000-4-2 ±30 kV ESD robustness, and thermal stability at Tj = 175 °C.

Technical Context

The SMB6F14A uses planar silicon junction technology to achieve low leakage current (0.2 µA at 25 °C) and high junction temperature capability (–55 to +175 °C). Its unidirectional configuration provides asymmetric clamping with forward conduction only during negative transients.

It delivers 600 W peak pulse power (10/1000 µs) at 25 °C and retains 470 W at Tj = 175 °C. Dynamic resistance (RD) is 0.223 Ω, enabling precise clamping control under fast-rising surges per IEC 61000-4-4 level 4 (±4 kV).

Key Specifications

Pinout & Package

SMB6F14A is housed in an SMB Flat surface-mount package (JEDEC MO-213AA), measuring 3.95 × 5.60 × 1.10 mm with 1 mm profile height and matte tin-plated leads compliant with J-STD-002 and IPC7531 footprint standards.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ14A and P6SMB14A, SMB6F14A offers superior high-temperature reliability (175 °C Tj), lower dynamic resistance (0.223 Ω), and tighter VBR tolerance (15.7–17.3 V), making it optimal for thermally demanding automotive and industrial deployments.

Availability

SMB6F14A is available at Aetrix Electronics and suitable for automotive power line protection, industrial PLC I/O conditioning, and telecom interface surge suppression requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SMB6F14A 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, MCU, power, and sensing solutions for automotive, industrial, and consumer markets.

The SMB6FxxA series belongs to ST's high-reliability TVS portfolio, engineered specifically for robust transient suppression in harsh environments-emphasizing low leakage, high Tj operation, and planar junction stability for mission-critical protection.

FAQ

What is the maximum surge current SMB6F14A can handle under 8/20 µs waveform?

SMB6F14A supports up to 136 A peak pulse current (IPP) under 8/20 µs waveform, corresponding to its 4 kW peak pulse power rating. This value is verified per IEC 61000-4-5 test conditions and reflects actual clamping performance at VCL = 29 V, ensuring compatibility with secondary surge protection stages in AC/DC power supplies and motor drives.

Does SMB6F14A require derating at elevated ambient temperatures?

Yes-its peak pulse power must be derated above 25 °C ambient. At Tj = 175 °C, PPP drops to 470 W (10/1000 µs), per Figure 3 in DS12898. Designers must calculate thermal resistance (Rth(j-a)) using PCB copper area and ensure junction temperature remains ≤175 °C during worst-case surge events using Zth(j-a) curves.

Is SMB6F14A compatible with lead-free reflow processes?

Yes-SMB6F14A is qualified for lead-free reflow per J-STD-020 MSL Level 1, with peak solder temperature up to 245 °C (see Figure 20). Its matte tin plating meets JESD 22-B102 E3 and MIL-STD-750 Method 2026, ensuring reliable wetting and intermetallic formation without voiding or dewetting.

How does SMB6F14A differ from bidirectional TVS diodes like SMB6F14CA?

SMB6F14A is unidirectional and blocks reverse voltage up to 14 V while clamping positive transients only; SMB6F14CA clamps both polarities symmetrically. Unidirectional use avoids forward conduction during normal negative signal swings-critical in DC-biased lines like automotive 12 V rails or RS-232 interfaces where reverse polarity is not expected.