STMicroelectronics SMB6F154A

Overview

SMB6F154A from STMicroelectronics is a unidirectional 600 W transient voltage suppression (TVS) diode designed for surge protection in DC power rails and signal lines. It features a standoff voltage (VRM) of 154 V, clamping voltage (VCL) of 246 V at 2.4 A (10/1000 µs), and operates up to 175 °C junction temperature-ideal for industrial power supplies and automotive body electronics requiring robust ESD and lightning surge immunity.

For engineers reviewing the SMB6F154A datasheet, SMB6F154A pinout, SMB6F154A application, or SMB6F154A equivalent, key selection criteria include clamping performance at rated peak pulse current (317 A @ 8/20 µs), low leakage (<0.2 µA @ 25 °C), flat SMB package thermal resistance, and IEC 61000-4-2/4-4 compliance up to ±30 kV contact discharge.

Technical Context

This TVS diode uses planar silicon technology to achieve stable breakdown characteristics and low dynamic resistance (10.2 Ω) across temperature. Its unidirectional configuration provides asymmetric clamping with forward conduction only during negative transients, enabling integration in polarized DC circuits without reverse-bias leakage concerns.

The device meets IEC 61000-4-2 Level 4 (±30 kV air/contact discharge) and IEC 61000-4-4 Level 4 (±4 kV), with peak pulse power capability de-rated above 25 °C-delivering 470 W at Tj = 175 °C (10/1000 µs). Its flat SMB package supports high-density PCB layouts while maintaining JEDEC-registered mechanical dimensions and IPC7531-compliant footprint.

Key Specifications

Pinout & Package

The SMB6F154A is housed in an SMB Flat package (JEDEC DO-214AA), measuring 3.95 mm × 5.60 mm × 1.10 mm with matte tin-plated leads. Its two-terminal construction supports surface-mount assembly on standard FR4 PCBs using IPC7531-compliant footprint.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar transient voltage suppression applications.

Compared with SMBJ150A and SMCJ150A, SMB6F154A offers optimized 154 V standoff matching common 150 V industrial rails, lowest leakage among alternatives, and flat 1 mm profile-making it ideal for thermally demanding, space-limited DC protection where precise voltage alignment and long-term reliability are critical.

Availability

SMB6F154A is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, telecom DC feeders, and renewable energy inverters requiring stable component supply across extended temperature and surge stress conditions.

Supply support for SMB6F154A 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, delivering innovative solutions across automotive, industrial, and power management markets with strong focus on reliability and environmental compliance.

The SMB6FxxA series belongs to ST's high-reliability TVS portfolio, engineered specifically for robust surge immunity in harsh-environment applications where long-term stability, low leakage, and high-temperature operation are mandatory design requirements.

FAQ

What is the maximum clamping voltage for SMB6F154A under an 8/20 µs surge?

The SMB6F154A clamps to 317 V at 12.6 A under an 8/20 µs waveform, as specified in Table 2 of DS12898 Rev 2. This value reflects worst-case VCL at rated IPP, ensuring downstream components see no more than 317 V during standardized lightning-surge testing.

Does SMB6F154A support reflow soldering per J-STD-020?

Yes-SMB6F154A is qualified for MSL Level 1 and supports peak reflow temperatures up to 245 °C for 20–40 seconds, per ST's recommended profile (Figure 20, DS12898 Rev 2). Its matte tin plating complies with J-STD-002 and JESD 22-B102 E3 standards for solderability.

How does SMB6F154A differ from bidirectional TVS diodes like SMB6F154CA?

SMB6F154A is unidirectional and blocks reverse voltage up to 154 V, conducting only during positive transients on the cathode. The 'CA' variant is bidirectional, offering symmetric clamping for AC-coupled or floating lines-but exhibits higher leakage and reduced DC blocking capability compared to the 'A' version.

Can SMB6F154A be used in parallel for higher surge current handling?

No-parallel use is not recommended due to mismatched dynamic resistance (10.2 Ω) and VBR tolerances (171–189 V), which cause uneven current sharing and potential thermal runaway. For higher current, select a single higher-rated device such as SMCJ150A or implement staged protection with GDT + TVS.