Taiwan Semiconductor Corporation SS14LW

Overview

SS14LW from Taiwan Semiconductor is a 1 A, 40 V Schottky barrier surface-mount rectifier in SOD-123W package, featuring 0.55 V max forward voltage at 1 A and 100 µA max reverse leakage at rated VR, optimized for high-efficiency switching mode power supplies and DC/DC converters.

For engineers reviewing the SS14LW datasheet, SS14LW pinout, SS14LW application, or SS14LW equivalent, key selection criteria include its low VF, 30 A surge rating, 125 °C junction temperature limit, guard ring overvoltage protection, and J-STD-020 Level 1 moisture sensitivity-critical for automated assembly and thermal reliability in compact power designs.

Technical Context

The SS14LW employs a single-die Schottky junction architecture with a guard ring structure to enhance transient overvoltage robustness. Its low forward voltage drop and fast recovery (inherently <10 ns) stem from majority-carrier conduction, eliminating minority-carrier storage delay.

Thermally, it delivers R_θJL = 25 °C/W and R_θJA = 80 °C/W, enabling 1 A continuous operation up to 125 °C ambient when mounted on standard PCB copper. The SOD-123W case meets UL 94V-0 and JESD201 Class 2 whisker resistance standards.

Key Specifications

Pinout & Package

SOD-123W surface-mount package: 2.90 × 1.40 × 1.02 mm body, matte tin-plated leads, cathode indicated by band, polarity-critical for rectifier orientation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-1EQH04-M3/5AT and SB140-TB, the SS14LW offers balanced VF/thermal performance in the industry-standard SOD-123W outline, with superior surge capability and guard ring protection-making it optimal for adapter and industrial SMPS where reliability and manufacturability are prioritized.

Availability

SS14LW is available at Aetrix Electronics and suitable for switching mode power supplies, AC-DC adapters, and flat panel display power systems requiring stable component supply, long-term lifecycle support, and J-STD-020 Level 1 assembly compatibility.

Supply support for SS14LW 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 SS14LW belongs to TSC's SSxLW Schottky rectifier family, engineered for high-efficiency, surface-mount power conversion in cost-sensitive consumer and industrial applications where low VF, robust surge tolerance, and automated assembly readiness are essential.

FAQ

What is the maximum junction temperature rating for SS14LW?

The SS14LW has a maximum junction temperature (T_J) of +125 °C, with storage temperature also rated from −55 to +125 °C. This rating applies across its full operating current range and is validated per JEDEC test conditions. Engineers must ensure thermal design-using the specified R_θJA = 80 °C/W-keeps actual junction temperature below this limit under worst-case ambient and load conditions. The SS14LW datasheet confirms this value in the Absolute Maximum Ratings table.

Does SS14LW have a guard ring, and what function does it serve?

Yes, the SS14LW incorporates a guard ring structure explicitly cited in its official features list. This design element enhances edge termination robustness, improving resistance to voltage-induced avalanche breakdown during repetitive transients-such as those occurring in SMPS flyback snubbers or line-voltage surges. It allows the SS14LW to maintain its rated 40 V V_RRM without derating under real-world overvoltage stress, unlike non-guarded Schottky devices.

What is the forward voltage specification for SS14LW at 1 A and 25 °C?

The SS14LW has a maximum forward voltage (V_F) of 0.55 V at I_F = 1 A and T_J = 25 °C, as confirmed in the Electrical Specifications table. This is a guaranteed upper limit-not a typical value-and is measured using a 0.3 ms pulse test. At higher junction temperatures, V_F decreases slightly due to Schottky physics, but system-level design should use the 0.55 V max for worst-case loss calculation.

Is SS14LW compatible with lead-free reflow soldering processes?

Yes, the SS14LW uses matte tin-plated leads qualified per J-STD-002 for solderability and is rated for lead-free reflow profiles. Its moisture sensitivity level is J-STD-020 Level 1, meaning it can be stored indefinitely at ≤30 °C/60% RH and placed directly into reflow without baking. The SOD-123W package construction-including UL 94V-0 molding compound-also withstands peak reflow temperatures up to 260 °C per JEDEC J-STD-020.

What packaging format is available for SS14LW?

The SS14LW is supplied in tape-and-reel packaging, with 10,000 units per reel, as specified in the Ordering Information section. This format is optimized for high-speed pick-and-place equipment used in automated SMT lines. The SOD-123W package dimensions (2.90 × 1.40 × 1.02 mm) and lead coplanarity meet IPC-7351 requirements, ensuring reliable placement yield and solder joint integrity in volume production.