Taiwan Semiconductor Corporation S2Q

Overview

S2Q from Taiwan Semiconductor is a 1200 V, 2 A standard surface-mount silicon rectifier diode in DO-214AA (SMB) package, featuring 50 A surge current capability, 1.15 V max forward voltage at 2 A, and 1500 ns reverse recovery time - used in high-voltage AC/DC front-end rectification for industrial SMPS and lighting ballasts.

For engineers reviewing the S2Q datasheet, S2Q pinout, S2Q application, or S2Q equivalent, key selection criteria include peak reverse voltage rating (1200 V), thermal resistance (16 °C/W junction-to-lead), moisture sensitivity level (J-STD-020 Level 1), RoHS/halogen-free compliance, and SMB footprint compatibility with automated placement.

Technical Context

The S2Q is a single-die, glass-passivated standard recovery rectifier optimized for cost-sensitive, medium-frequency switching applications up to ~100 kHz. Its 1200 V V_RRM and 50 A I_FSM support robust line-input rectification under transient overvoltage conditions.

Thermal performance is defined by R_θJL = 16 °C/W and R_θJA = 53 °C/W, with junction temperature rated from –55 °C to +150 °C. Reverse leakage remains ≤125 µA at 125 °C, and junction capacitance is 30 pF at 4 V.

Key Specifications

Pinout & Package

Package: DO-214AA (SMB), surface-mount, cathode indicated by band, matte tin-plated leads, UL 94V-0 molding compound, 0.090 g weight.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH2R06 and MUR220, the S2Q uniquely balances high-voltage capability (1200 V), standard recovery behavior, and SMB packaging - making it optimal for primary-side rectification where voltage margin and thermal robustness outweigh speed requirements.

Availability

S2Q is available at Aetrix Electronics and suitable for industrial SMPS, LED drivers, and AC-DC adapters requiring stable component supply with J-STD-020 Level 1 handling and RoHS/halogen-free compliance.

Supply support for S2Q 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 rectifiers, TVS, MOSFETs, and transistors.

The S2Q belongs to TSC's S2x family of standard recovery rectifiers designed specifically for cost-effective, high-reliability AC/DC front-end rectification in industrial and lighting applications.

FAQ

What is the peak repetitive reverse voltage rating of the S2Q?

The S2Q has a peak repetitive reverse voltage (V_RRM) rating of 1200 V. This value is confirmed in the Absolute Maximum Ratings table for the S2Q variant within the S2A–S2V series. It defines the maximum allowable reverse-biased voltage the device can block continuously without breakdown. The S2Q is therefore suited for rectifying 840 V RMS inputs, providing a 1.4× safety margin over typical 600 VAC industrial lines.

Does the S2Q have a specified reverse recovery time, and how does it affect circuit design?

Yes, the S2Q has a reverse recovery time (t_rr) of 1500 ns, measured at I_F = 0.5 A, I_R = 1.0 A, and I_rr = 0.25 A. This standard recovery characteristic makes the S2Q appropriate for line-frequency and low-to-medium frequency switching applications (<100 kHz), but unsuitable for high-frequency PFC stages where faster diodes like ultrafast or FRED types are required to minimize switching loss and EMI.

Is the S2Q compliant with RoHS and halogen-free standards?

Yes, the S2Q is RoHS compliant and halogen-free per IEC 61249-2-21. These compliance statements are explicitly listed in the FEATURES section of the official Taiwan Semiconductor documentation. This ensures the S2Q meets environmental requirements for export to the EU, Japan, South Korea, and other regulated markets, and supports lead-free reflow soldering processes.

What is the thermal resistance from junction to lead (R_θJL) for the S2Q, and why does it matter?

The S2Q has a junction-to-lead thermal resistance (R_θJL) of 16 °C/W, as specified in the THERMAL PERFORMANCE section. This parameter quantifies how effectively heat transfers from the silicon die to the PCB copper via the leads. A low R_θJL allows the S2Q to dissipate power efficiently into a large copper pour, reducing reliance on external heatsinks in space-constrained industrial designs.

Can the S2Q be used as a direct replacement for the S2V in a 1400 V design?

No, the S2Q cannot replace the S2V in a 1400 V design. While both share the same package and current rating, the S2Q is rated for 1200 V V_RRM, whereas the S2V is rated for 1400 V. Using the S2Q in a 1400 V application risks premature avalanche breakdown and field failure. Always match the V_RRM rating to the peak system voltage stress plus required safety margin.