Taiwan Semiconductor Corporation SS22M

Overview

SS22M from Taiwan Semiconductor is a 2A, 20V Schottky barrier surface-mount rectifier in Micro SMA package, featuring VF ≤ 0.60 V at 2A/25°C, IR ≤ 150 µA at 20V/25°C, and TJ max = 150°C - deployed in compact DC-DC converters and AC-DC adapters requiring low forward loss and high thermal efficiency.

For engineers reviewing the SS22M datasheet, SS22M pinout, SS22M application, or SS22M equivalent, key selection criteria include repetitive peak reverse voltage (20 V), surge current rating (25 A), junction-to-lead thermal resistance (15 °C/W), cathode-band polarity marking, and RoHS/halogen-free compliance for high-volume automated assembly.

Technical Context

The SS22M employs a single-die Schottky barrier structure optimized for low VF and fast switching in unidirectional power conversion paths. Its Micro SMA package enables board-level height constraints ≤ 0.68 mm while maintaining JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity.

Thermal performance is defined by R_θJL = 15 °C/W and R_θJA = 105 °C/W, supporting continuous 2A conduction up to +125°C ambient when mounted on standard 1-in² copper. Reverse leakage rises to 15 mA at 125°C, requiring thermal-aware layout in high-temperature SMPS designs.

Key Specifications

Pinout & Package

Package: Micro SMA - surface-mount, single-anode/single-cathode configuration with cathode band marking; case meets UL 94V-0, matte tin-plated leads, 0.006 g weight.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SS22H and VS-2EY20-M3, the SS22M offers the lowest R_θJL (15 °C/W) for direct PCB thermal transfer, making it optimal for thermally constrained layouts where lead-to-copper conduction is prioritized over absolute VF minimum.

Availability

SS22M is available at Aetrix Electronics and suitable for USB-C power adapters, industrial DC-DC modules, and LED driver power supplies requiring stable component supply, long-term manufacturability, and full RoHS/halogen-free compliance.

Supply support for SS22M 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 Taiwanese manufacturer specializing in discrete power semiconductors, including Schottky rectifiers, MOSFETs, and TVS devices, with ISO/TS 16949 and ISO 14001 certification.

The SS22M belongs to TSC's SS2xM Schottky rectifier family, engineered for high-efficiency, low-profile AC-DC and DC-DC power conversion in consumer and industrial applications where thermal density and automated assembly are critical.

FAQ

What is the maximum repetitive peak reverse voltage rating for SS22M?

The SS22M has a maximum repetitive peak reverse voltage (VRRM) rating of 20 V, as confirmed in the Absolute Maximum Ratings table of the official Taiwan Semiconductor datasheet (Version M2103). This value is fixed for SS22M and differs from SS23M (30 V) and SS24M (40 V). Exceeding 20 V risks irreversible avalanche breakdown. The SS22M must be selected only in circuits where reverse voltage remains strictly below this threshold under all operating and transient conditions.

Does SS22M support lead-free reflow soldering per JEDEC standards?

Yes, the SS22M supports lead-free reflow soldering. Its matte tin-plated leads comply with J-STD-002 for solderability, and its moisture sensitivity level is rated J-STD-020 Level 1 - meaning no baking is required prior to standard Pb-free reflow profiles (peak 260°C). The Micro SMA package is qualified for IPC/JEDEC J-STD-020D, and the device passes JESD201 Class 2 whisker testing, ensuring long-term interconnect reliability.

What is the forward voltage drop of SS22M at 2 A and 125°C junction temperature?

The SS22M exhibits a typical forward voltage (VF) of 0.55 V at 2 A and 125°C junction temperature, as specified in the Electrical Specifications table. This is lower than its 0.60 V maximum at 25°C, reflecting the negative temperature coefficient of Schottky diodes. Designers should use 0.55 V for worst-case thermal analysis in high-ambient environments, such as enclosed power supplies or automotive under-hood applications.

Is SS22M pin-compatible with other Micro SMA Schottky rectifiers like SS32?

No, SS22M is not pin-compatible with SS32. While both use Micro SMA packages, SS32 is a 3 A device with different internal die geometry and thermal design - its R_θJL is 12 °C/W versus SS22M's 15 °C/W, and its VF is 0.52 V @ 3 A. More critically, SS32 has different thermal pad requirements and may exceed current density limits if substituted. Only VS-2EY20-M3 is confirmed as a same-pinout, same-spec alternative for SS22M.

What does the marking code 'D' on SS22M indicate?

On the SS22M device, the marking code 'D' identifies the voltage grade within the SS2xM family, specifically confirming it is the 20 V variant. Per the Absolute Maximum Ratings table, SS22M is marked 'D', SS23M is marked 'E', and SS24M is marked 'F'. This laser-marked code is located adjacent to the cathode band and serves as a visual verification method during incoming inspection or manual rework - no external documentation is needed to confirm VRRM.