Taiwan Semiconductor Corporation SS24L

Overview

SS24L from Taiwan Semiconductor is a 2 A, 40 V Schottky barrier surface-mount rectifier in Sub SMA package, featuring low forward voltage (0.50 V at 2 A, 25°C), 50 A peak surge current, and junction temperature rating up to +125°C. It serves as a high-efficiency output rectifier in compact DC-DC converters.

For engineers reviewing the SS24L datasheet, SS24L pinout, SS24L application, or SS24L equivalent, key selection criteria include its 40 V repetitive peak reverse voltage, 0.50 V forward drop at rated current, Sub SMA thermal performance (R_θJL = 17°C/W), and moisture sensitivity level 1 compliance.

Technical Context

The SS24L uses a single-die Schottky structure optimized for low conduction loss in medium-voltage switching power supplies. Its guard ring design enhances overvoltage robustness, and matte tin-plated leads ensure reliable solderability per J-STD-002.

With R_θJA = 75°C/W and R_θJL = 17°C/W, the device supports thermally constrained layouts. Reverse leakage is limited to 400 µA at 25°C and 15 mA at 100°C under rated 40 V reverse bias.

Key Specifications

Pinout & Package

Package: Sub SMA - Surface-mount plastic package with cathode band marking, UL 94V-0 molding compound, and matte tin-plated leads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MBR240T3G and SS24, the SS24L offers superior thermal performance (R_θJL = 17°C/W) and smaller Sub SMA footprint-critical for space-constrained USB-C and PoE-powered designs-while maintaining identical 40 V/2 A ratings and low-leakage behavior.

Availability

SS24L is available at Aetrix Electronics and suitable for USB-C power adapters, industrial DC-DC modules, and telecom power supplies requiring stable component supply, consistent parametric performance, and RoHS/halogen-free compliance.

Supply support for SS24L 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 global power and signal conditioning markets since 1979.

The SS24L belongs to TSC's SS2xL Schottky rectifier family, engineered specifically for high-efficiency, surface-mount secondary-side rectification in compact switching power supplies operating up to 500 kHz.

FAQ

What is the maximum repetitive peak reverse voltage rating for SS24L?

The SS24L has a maximum repetitive peak reverse voltage (V_RRM) of 40 V, verified per Taiwan Semiconductor's O2103 datasheet revision. This rating defines the highest continuous reverse-bias voltage the device can block without avalanche breakdown. Operating above 40 V risks irreversible junction failure. The SS24L is not rated for 60 V or higher reverse conditions-those require SS26L or higher variants.

What is the forward voltage drop of SS24L at full rated current?

The SS24L exhibits a typical forward voltage (V_F) of 0.50 V at 2 A and 25°C junction temperature, as measured under pulsed conditions (PW = 0.3 ms). This value increases with temperature and current-e.g., ~0.55 V at 100°C. The low V_F directly reduces conduction losses compared to silicon diodes, making SS24L especially effective in high-efficiency 5–12 V output stages.

Does SS24L have a built-in guard ring, and what does it do?

Yes, the SS24L incorporates a guard ring structure, explicitly cited in its official features list. This design element improves edge termination robustness, raising the device's critical rate of rise of off-state voltage (dv/dt) to 10,000 V/μs and enhancing immunity to transient overvoltage spikes-such as those occurring during MOSFET switching transitions-without requiring external snubber networks.

Is SS24L compatible with lead-free reflow soldering processes?

Yes, SS24L is fully compatible with lead-free reflow soldering. Its matte tin-plated leads meet J-STD-002 solderability requirements, and its moisture sensitivity level is rated MSL Level 1-meaning no baking or dry-pack handling is required prior to assembly. The Sub SMA package withstands JEDEC-standard peak reflow temperatures up to 260°C for 10 seconds.

What is the thermal resistance from junction to ambient for SS24L?

The SS24L has a junction-to-ambient thermal resistance (R_θJA) of 75°C/W under standard test conditions (still air, FR-4 board, 1-inch² 2-oz copper pad). This value assumes minimal PCB copper; actual performance improves significantly with added thermal vias and extended copper pours. For heatsinking design, the lower junction-to-lead resistance (R_θJL = 17°C/W) is more relevant when using internal ground planes.