onsemi SMF05T2G

Overview

SMF05T2G from onsemi is a quad unidirectional ESD protection diode array in SC-88A (SOT-353) package, featuring 6.1–7.2 V breakdown voltage at 1 mA, <5 µA leakage at 5 V, 90 pF typical capacitance, and 9.5 V clamping voltage at 1 A peak pulse current. It protects four I/O lines in space-constrained consumer electronics such as smartphones and medical devices.

For engineers reviewing the SMF05T2G datasheet, pinout, applications, or equivalent options, key selection criteria include IEC 61000-4-2 compliance (±16 kV air / ±9 kV contact), low clamping voltage for signal integrity preservation, SC-88A footprint compatibility, and Pb-free RoHS-compliant packaging.

Technical Context

The SMF05T2G implements a common-anode quad unidirectional TVS architecture with four independent cathodes and one shared anode terminal, enabling simultaneous protection of four data or signal lines without cross-coupling. Its silicon avalanche junction design delivers fast response (<1 ns) to ESD transients and stable clamping performance across −55 °C to +150 °C operating range.

It meets IEC 61000-4-2 Level 4 (±16 kV air, ±9 kV contact) and supports transient surge handling up to 200 W (8/20 µs waveform). The device operates with reverse standoff voltage of 5.0 V and exhibits forward voltage ≤1.25 V at 200 mA, ensuring minimal impact on signal DC bias during normal operation.

Key Specifications

Pinout & Package

SC-88A (SOT-353) is a 5-pin, surface-mount, Pb-free thermosetting plastic package with void-free transfer-molded construction and corrosion-resistant finish optimized for automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMF05T2G, ESD5Z5.0T1G increases component count and layout complexity for quad-line protection, while TPD4E001DRYR offers lower capacitance but reduced surge handling - making SMF05T2G optimal for cost-sensitive, space-constrained 5 V I/O protection with robust 200 W transient capability.

Availability

SMF05T2G is available at Aetrix Electronics and suitable for smartphones, medical diagnostic equipment, and industrial printers requiring stable component supply and long-term obsolescence management.

Supply support for SMF05T2G 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power, analog, sensors, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The SMF05 series belongs to onsemi's transient voltage suppression portfolio, engineered specifically for board-level ESD protection in high-density portable electronics with strict size and reliability requirements.

FAQ

What is the exact package type and pin configuration of SMF05T2G?

The SMF05T2G uses the SC-88A (SOT-353) 5-pin package with pin 1 = Cathode 1, pin 2 = Common Anode, pin 3 = Cathode 2, pin 4 = Cathode 3, and pin 5 = Cathode 4. This common-anode quad configuration allows protection of four independent signal lines using a single ground or V_CC-tied anode node. The package measures 2.1 × 1.25 mm and is Pb-free and RoHS-compliant.

Does SMF05T2G meet IEC 61000-4-2 ESD immunity standards?

Yes, SMF05T2G is explicitly rated for IEC 61000-4-2 Level 4: ±16 kV air discharge and ±9 kV contact discharge. This rating is verified per the onsemi datasheet (Rev. 3, September 2025) and reflects its ability to safely clamp ESD transients without failure or parametric shift. The device achieves this via low-junction-capacitance silicon avalanche structure and controlled breakdown characteristics.

What is the maximum clamping voltage of SMF05T2G under ESD stress?

The SMF05T2G has a maximum clamping voltage of 9.5 V at 1 A peak pulse current (8/20 µs waveform), and 12.5 V at 12 A. This clamping performance ensures protected ICs experience minimal overvoltage during ESD events. The low clamping value - combined with 6.1–7.2 V breakdown - provides tight voltage margin for 5 V systems while avoiding false triggering during normal operation.

Is SMF05T2G still in active production or discontinued?

Per the official onsemi datasheet (Rev. 3, September 2025), SMF05T2G is marked as discontinued in the ordering table. However, Aetrix Electronics maintains legacy inventory and offers lifecycle management support including last-time-buy planning, cross-reference guidance, and alternative sourcing for SMF05T2G to ensure continuity for existing designs.

How does SMF05T2G compare to single-channel ESD diodes like ESD5Z5.0T1G in system design?

SMF05T2G integrates four unidirectional ESD protection paths into one SC-88A package, reducing PCB area by ~60% versus four discrete ESD5Z5.0T1G units. While ESD5Z5.0T1G offers identical per-channel electrical specs, its discrete implementation increases routing complexity, parasitic inductance, and assembly cost. SMF05T2G's common-anode architecture simplifies grounding and improves consistency across protected lines.