Taiwan Semiconductor Corporation SS23L

Overview

SS23L from Taiwan Semiconductor is a 2 A, 30 V Schottky barrier surface-mount rectifier in Sub SMA package, featuring low forward voltage (0.50 V at 2 A, 25°C), high surge current capability (50 A), and junction temperature rating up to +150°C. It serves as a primary output rectifier in compact DC-DC converters and AC-DC adapters.

For engineers reviewing the SS23L datasheet, SS23L pinout, SS23L application, or SS23L equivalent, key selection criteria include its 30 V repetitive peak reverse voltage, 17 °C/W junction-to-lead thermal resistance, moisture sensitivity level 1 compliance, and cathode-band polarity marking for reliable automated assembly.

Technical Context

The SS23L employs a single-die Schottky structure optimized for low conduction loss in high-frequency switching topologies. Its 0.50 V forward voltage at 2 A and 25°C directly reduces power dissipation versus silicon diodes, while the 50 A non-repetitive surge rating supports transient load conditions in SMPS outputs.

Thermally, the device achieves 17 °C/W junction-to-lead resistance and 75 °C/W junction-to-ambient resistance in standard PCB mounting, enabling stable operation up to +150°C junction temperature. The Sub SMA package meets UL 94V-0 flammability and JESD201 Class 2 whisker resistance requirements.

Key Specifications

Pinout & Package

Package: Sub SMA - Surface-mount plastic package with matte tin-plated leads, UL 94V-0 molding compound, cathode band polarity indicator, and 0.019 g mass.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SS23L, SS33HE3/57T provides headroom for higher-current derivatives but adds unnecessary cost and loss at 2 A, while VS-2EJH03-M3/5BT delivers nearly identical performance with alternate qualification pedigree-making SS23L optimal for cost-sensitive, volume-adaptor designs requiring proven thermal and surge robustness.

Availability

SS23L is available at Aetrix Electronics and suitable for switching mode power supplies, USB-C PD adapters, and industrial DC-DC converters requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for SS23L 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 management and industrial markets since 1979.

The SS2xL series was developed specifically for high-efficiency, surface-mount rectification in space-constrained AC-DC and DC-DC power stages, emphasizing low VF, robust surge handling, and MSL-1 manufacturability.

FAQ

What is the maximum junction temperature rating for SS23L?

The SS23L has a maximum junction temperature (TJ MAX) rating of +150°C, verified per TSC's O2103 datasheet revision. This allows the SS23L to operate reliably in high-ambient environments such as enclosed industrial power supplies or automotive under-dash modules. Derating begins above +75°C ambient, and the SS23L maintains full 2 A current capability up to that point when mounted on standard 1 oz. copper PCBs.

Does SS23L have a guard ring structure, and what does it protect against?

Yes, the SS23L incorporates a guard ring structure explicitly stated in its official features list. This design element prevents edge breakdown during voltage transients, improving ruggedness against fast-rising dv/dt events-such as those occurring in flyback snubber networks or inductive load switching. The guard ring ensures stable 30 V reverse blocking performance even under non-ideal layout conditions where field crowding might otherwise trigger premature avalanche.

Is SS23L compatible with lead-free reflow processes?

Yes, the SS23L is fully compatible with lead-free reflow processes. Its matte tin-plated leads meet J-STD-002 solderability requirements, and its moisture sensitivity level is rated MSL 1 per J-STD-020-meaning it can be stored indefinitely at ≤30°C/60% RH without baking. The Sub SMA package withstands peak reflow temperatures up to 260°C, supporting standard IPC/JEDEC J-STD-020D profile compliance.

What is the reverse leakage current of SS23L at 30 V and 100°C?

At 30 V reverse voltage and 100°C junction temperature, the SS23L exhibits a maximum reverse leakage current (IR) of 15 mA, as specified in the "ELECTRICAL SPECIFICATIONS" table of the O2103 datasheet. This value is confirmed for SS22L–SS24L variants and reflects worst-case behavior under elevated thermal stress-critical for evaluating standby power loss in always-on auxiliary supplies.

How does the thermal resistance of SS23L compare between junction-to-lead and junction-to-ambient?

The SS23L has a junction-to-lead thermal resistance (RθJL) of 17 °C/W and a junction-to-ambient resistance (RθJA) of 75 °C/W, per the "THERMAL PERFORMANCE" section. This 4.4× difference confirms that effective heat transfer depends heavily on PCB copper area connected to the cathode/anode pads. For thermal design, RθJL governs short-term pulse handling, while RθJA determines steady-state limits-so optimizing pad layout is essential to realize the full +150°C TJ capability.