Taiwan Semiconductor Corporation SS25

Overview

SS25 from Taiwan Semiconductor is a 2 A, 50 V Schottky barrier surface-mount rectifier in DO-214AA (SMB) package, optimized for high-efficiency switching power supplies with low forward voltage (0.70 V at 2 A, 25°C) and high surge capability (50 A IFSM). It serves as a primary output rectifier in AC/DC adapters and DC/DC converters.

For engineers reviewing the SS25 datasheet, SS25 pinout, SS25 application, or SS25 equivalent, key selection criteria include its 50 V VRRM rating, 0.70 V VF at 2 A/25°C, 50 A surge current tolerance, thermal resistance (RθJA = 70°C/W), and SMB package compatibility with automated SMT assembly.

Technical Context

The SS25 operates as a single-die Schottky rectifier with unidirectional conduction and cathode-band polarity marking. Its junction temperature range spans –55°C to +150°C, supporting operation in thermally demanding environments such as enclosed LED drivers and industrial power modules.

Designed for fast-switching topologies, it delivers 10,000 V/μs dV/dt immunity and exhibits low reverse leakage (≤5 mA at 100°C, rated VR), enabling stable performance in high-frequency SMPS where diode recovery losses must be minimized.

Key Specifications

Pinout & Package

Package: DO-214AA (SMB), surface-mount plastic case with matte tin-plated leads, moisture sensitivity level 1 (J-STD-020), UL 94V-0 rated molding compound, and cathode band polarity indicator.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SS25H and VS-2EY50, the SS25 offers the lowest VF (0.70 V) and lowest IR (5 mA at 100°C) among these three 50 V/2 A SMB Schottky rectifiers, making it optimal for thermally constrained, high-efficiency adapter and LED driver designs where conduction loss directly impacts thermal management and size.

Availability

SS25 is available at Aetrix Electronics and suitable for AC/DC adapters, LED drivers, and DC/DC converters requiring stable component supply, consistent parametric performance across production lots, and full traceability to Taiwan Semiconductor's N2306 wafer lot.

Supply support for SS25 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 Company (TSC) is a vertically integrated Taiwanese manufacturer specializing in discrete power semiconductors, including Schottky rectifiers, TVS diodes, and MOSFETs, with ISO 9001 and IATF 16949 certified facilities.

The SS22–SS215 series was developed to deliver cost-effective, high-reliability Schottky rectifiers for mainstream consumer and industrial power conversion, balancing low VF, robust surge capability, and JEDEC-standard SMB packaging for global SMT compatibility.

FAQ

What is the maximum junction temperature rating for the SS25?

The SS25 has a maximum junction temperature (TJ) rating of +150°C, allowing reliable operation in high-temperature environments such as enclosed LED drivers or industrial power supplies. This rating is validated per TSC's N2306 revision and applies under specified thermal conditions with proper PCB copper area and airflow. The SS25 maintains electrical integrity up to this limit, with VF and IR values guaranteed at 100°C and 125°C test points per datasheet Section 3.

Does the SS25 have a guard ring structure, and what benefit does it provide?

Yes, the SS25 incorporates a guard ring structure explicitly stated in its features list. This design enhances edge termination robustness, improving resistance to transient overvoltage events such as line surges or inductive kickback without requiring derating of its 50 V VRRM specification. It contributes directly to field reliability in unregulated or marginally filtered input stages common in low-cost AC/DC adapters.

What is the reverse leakage current of the SS25 at 100°C and rated reverse voltage?

The SS25 exhibits a maximum reverse leakage current (IR) of 5 mA at 50 V reverse voltage and 100°C junction temperature, as specified in the Electrical Specifications table. This value is critical for standby power budgeting in energy-efficient designs like EU ErP Tier 2-compliant adapters, where low IR minimizes no-load losses and helps meet strict <300 mW requirements.

Is the SS25 compatible with lead-free reflow soldering processes?

Yes, the SS25 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 at Level 1 per J-STD-020 - meaning it can be stored indefinitely at ≤30°C/60% RH without baking prior to assembly. The DO-214AA package also withstands peak reflow temperatures up to 260°C per JEDEC J-STD-020D.

How does the forward voltage of the SS25 compare between 25°C and 100°C operating conditions?

The SS25's forward voltage decreases with rising temperature: it is 0.70 V maximum at 2 A and 25°C, and drops to 0.65 V maximum at 2 A and 100°C. This negative temperature coefficient is characteristic of Schottky diodes and improves thermal stability in high-power-density applications, as lower VF at elevated temperatures reduces self-heating and avoids thermal runaway under sustained load.