Taiwan Semiconductor Corporation SS24MH

Overview

SS24MH from Taiwan Semiconductor is a 2 A, 40 V Schottky barrier surface-mount rectifier in Micro SMA package, featuring low forward voltage (0.60 V @ 2 A, 25°C), 25 A surge rating, and AEC-Q101 qualification for automotive use. It serves as a freewheeling or reverse-battery protection diode in compact DC/DC converters.

For engineers reviewing the SS24MH datasheet, SS24MH pinout, SS24MH application, or SS24MH equivalent, key selection criteria include its 40 V repetitive peak reverse voltage, 0.68 mm profile height, 150 µA max reverse leakage at 25°C, thermal resistance (R_θJL = 15 °C/W), and Micro SMA mechanical compatibility with automated SMT placement.

Technical Context

The SS24MH is a single-die Schottky rectifier optimized for high-frequency, low-voltage power conversion. Its junction capacitance of 35 pF at 4.0 V enables fast switching, while the 150°C maximum junction temperature supports operation in thermally constrained automotive environments.

Designed for unidirectional conduction, it uses a planar Schottky junction with matte tin-plated leads compliant with J-STD-002 solderability and JESD 201 Class 2 whisker resistance. Polarity is marked by a cathode band on the Micro SMA case.

Key Specifications

Pinout & Package

Package: Micro SMA - Surface-mount plastic case with cathode band marking, 0.68 mm typical height, UL 94V-0 rated molding compound, and J-STD-002 solderable matte tin leads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NSS24100U and VS-2EYH04-M3, the SS24MH offers the lowest profile (0.68 mm) and best thermal path to PCB (R_θJL = 15 °C/W), making it optimal for space- and thermally constrained automotive SMT designs where Micro SMA footprint is fixed.

Availability

SS24MH is available at Aetrix Electronics and suitable for automotive DC/DC converters, reverse battery protection circuits, and LED lighting drivers requiring stable component supply and AEC-Q101-compliant sourcing.

Supply support for SS24MH 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

Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving automotive, industrial, and consumer markets since 1979.

The SS24MH belongs to TSC's AEC-Q101-qualified Schottky rectifier product line, engineered specifically for high-efficiency, low-profile power conversion in automotive electronics where thermal performance, reliability, and SMT manufacturability are critical.

FAQ

What is the maximum junction temperature rating for the SS24MH?

The SS24MH has a maximum junction temperature (T_J) of +150°C, validated across its full operating range per AEC-Q101 stress testing. This rating allows reliable operation in under-hood automotive environments where ambient temperatures may reach 125°C, provided thermal design maintains junction temperature below this limit. The SS24MH's R_θJL of 15 °C/W supports effective heat transfer to the PCB, enabling robust thermal management in compact layouts.

Is the SS24MH pin-compatible with other Micro SMA Schottky diodes?

The SS24MH uses the standard Micro SMA package with anode and cathode terminals defined by physical orientation and cathode band marking-consistent with JEDEC MO-203-AB. While many Micro SMA diodes share this outline, pinout compatibility depends on identical die orientation and marking convention. The SS24MH follows TSC's standard Micro SMA pinout: cathode band denotes the cathode terminal. Always verify polarity and pad layout against the specific alternative part's datasheet before substitution.

Does the SS24MH require moisture-sensitive handling before reflow?

No-the SS24MH is rated Moisture Sensitivity Level (MSL) 1 per J-STD-020, meaning it can be stored indefinitely at ≤30°C/60% RH without dry-packaging or baking. This eliminates pre-reflow baking steps and simplifies integration into high-volume SMT lines. The MSL-1 rating is confirmed in TSC's official SS22MH–SS24MH datasheet Version A2103 and applies identically to the SS24MH.

What is the reverse leakage current specification for the SS24MH at elevated temperature?

At 125°C junction temperature and rated reverse voltage (40 V), the SS24MH exhibits a maximum reverse leakage current (I_R) of 15 mA, as specified in the Electrical Specifications table. At 25°C and 40 V, the limit is 150 µA. This temperature-dependent leakage behavior is inherent to Schottky junction physics and must be accounted for in high-temperature bias networks or precision sensing paths where leakage could affect accuracy.

Can the SS24MH be used in synchronous rectification topologies?

The SS24MH is a passive Schottky rectifier-not a synchronous rectifier IC-and therefore cannot replace actively controlled MOSFETs in synchronous buck or forward converters. However, it functions effectively as the freewheeling diode in asynchronous topologies or as a secondary-side rectifier in isolated flyback or forward converters where simplicity and cost are prioritized over peak efficiency. Its 35 pF junction capacitance and low V_F make it well-suited for such roles in the SS24MH application space.