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Home > Products > Discrete Semiconductor Products > Diodes > Rectifiers > Single Diodes

Taiwan Semiconductor Corporation S3Q

Name: S3Q
Brand: Taiwan Semiconductor Corporation
SKU: S3Q
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: S3Q

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-214AB, SMC

Datasheet:: S3Q.pdf

Description:: DIODE GEN PURP 1.2KV 3A DO214AB

Quantity:: RFQ Add To RFQ list

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Inventory:5,740

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Product details

Overview

S3Q from Taiwan Semiconductor is a 3A, 1200V surface-mount silicon rectifier diode in DO-214AB (SMC) package, designed as a freewheeling or output rectifier in high-voltage DC/DC and AC/DC power stages. It features glass-passivated junction, 150°C max junction temperature, 120A surge rating (8.3ms), and low reverse leakage (≤10 µA at 25°C).

For engineers reviewing the S3Q datasheet, S3Q pinout, S3Q application, or S3Q equivalent, key selection criteria include repetitive peak reverse voltage (1200 V), forward voltage drop (0.93 V @ 3 A, 25°C), thermal resistance (R_θJL = 16 °C/W), and RoHS/halogen-free compliance for industrial power supply designs.

Technical Context

The S3Q is a single-die, standard recovery rectifier optimized for switching-mode power supplies operating up to 100 kHz. Its glass-passivated junction ensures stable reverse characteristics across -55°C to +150°C ambient, while the DO-214AB (SMC) package supports automated placement and meets J-STD-020 Level 1 moisture sensitivity.

Thermal performance is characterized with a 16 mm × 16 mm copper pad PCB test board: R_θJA = 47 °C/W, R_θJC = 17 °C/W, enabling reliable 3 A continuous conduction in compact layouts without forced airflow.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	1200 V - Withstands repetitive reverse voltage up to 1200 V without breakdown in SMPS output or inverter leg applications.
I_F	3 A - Rated average forward current at case temperature ≤ 75°C on standard PCB layout.
I_FSM	120 A (8.3 ms) - Handles short-duration line surges or inductive kickback without failure.
V_F	0.93 V @ 3 A, 25°C - Low conduction loss improves efficiency in 12–48 V output rectification stages.
R_θJL	16 °C/W - Enables direct thermal coupling to PCB copper, supporting thermal design without heatsink below 2 W dissipation.
I_R	≤10 µA @ 1200 V, 25°C - Minimizes standby power loss in high-impedance hold-up circuits.

Pinout & Package

DO-214AB (SMC) surface-mount package with cathode-indicating band; two-terminal device (anode and cathode). Matte tin-plated leads meet J-STD-002 solderability requirements.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to lower-potential node (e.g., transformer secondary center-tap or switch node return path).
Cathode	Forward current exit point / reverse-blocking terminal	Marked by band; connects to positive output rail; blocks 1200 V reverse during off-state.

Key Features

Feature	Design Value
Glass-passivated junction	Ensures long-term stability of reverse leakage and breakdown voltage under thermal cycling and humidity stress.
J-STD-020 Level 1 moisture sensitivity	Eliminates bake requirement prior to reflow; compatible with standard SMT assembly lines without dry-pack handling.
UL 94V-0 molding compound	Meets flame-retardancy requirements for enclosed industrial and telecom power enclosures.
RoHS and halogen-free (IEC 61249-2-21)	Supports environmental compliance for global OEM shipments without material declaration exceptions.

Applications

Switch Mode Power Supply	Inverters and Converters
Use Scenario: Output rectification in 30–200 W offline flyback or forward converters with 12–48 V outputs. IC Role / Device Role / Timing Role: Freewheeling rectifier conducting during MOSFET off-time; handles continuous 3 A DC output current. Use Value: 0.93 V forward drop minimizes conduction loss; 1200 V V_RRM accommodates reflected transients in universal-input designs.	Use Scenario: DC link freewheeling path in 3-phase IGBT-based motor drives and solar microinverters. IC Role / Device Role / Timing Role: Unidirectional current path across inductive loads; clamps voltage spikes during switching transitions. Use Value: 150°C junction rating enables operation in sealed enclosures; 120 A I_FSM withstands motor startup surges.
Freewheeling Diode	Industrial HV DC/DC Modules
Use Scenario: Energy recirculation path across relay coils, solenoids, and transformer windings in PLC I/O modules. IC Role / Device Role / Timing Role: Provides low-impedance path for stored inductive energy during turn-off; prevents voltage overshoot beyond 1200 V. Use Value: ≤10 µA reverse leakage at 25°C reduces standby power; glass passivation maintains reliability over 10-year field life.	Use Scenario: Isolated auxiliary supply rectification in 1 kV-rated telecom rectifiers and railway signaling power units. IC Role / Device Role / Timing Role: High-voltage output stage rectifier in multi-kW modular PSUs where creepage and clearance demand ≥1200 V isolation. Use Value: DO-214AB footprint supports high-density layout; UL 94V-0 compound satisfies safety agency spacing requirements.

Switch Mode Power Supply

Inverters and Converters

Use Scenario: Output rectification in 30–200 W offline flyback or forward converters with 12–48 V outputs.

IC Role / Device Role / Timing Role: Freewheeling rectifier conducting during MOSFET off-time; handles continuous 3 A DC output current.

Use Value: 0.93 V forward drop minimizes conduction loss; 1200 V V_RRM accommodates reflected transients in universal-input designs.

Use Scenario: DC link freewheeling path in 3-phase IGBT-based motor drives and solar microinverters.

IC Role / Device Role / Timing Role: Unidirectional current path across inductive loads; clamps voltage spikes during switching transitions.

Use Value: 150°C junction rating enables operation in sealed enclosures; 120 A I_FSM withstands motor startup surges.

Freewheeling Diode

Industrial HV DC/DC Modules

Use Scenario: Energy recirculation path across relay coils, solenoids, and transformer windings in PLC I/O modules.

IC Role / Device Role / Timing Role: Provides low-impedance path for stored inductive energy during turn-off; prevents voltage overshoot beyond 1200 V.

Use Value: ≤10 µA reverse leakage at 25°C reduces standby power; glass passivation maintains reliability over 10-year field life.

Use Scenario: Isolated auxiliary supply rectification in 1 kV-rated telecom rectifiers and railway signaling power units.

IC Role / Device Role / Timing Role: High-voltage output stage rectifier in multi-kW modular PSUs where creepage and clearance demand ≥1200 V isolation.

Use Value: DO-214AB footprint supports high-density layout; UL 94V-0 compound satisfies safety agency spacing requirements.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage rectifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH3L06S	V_RRM = 600 V, I_F = 3 A, faster recovery (t_rr ≈ 50 ns)	Not suitable for 1200 V systems; limited to <600 V DC link or PFC boost outputs	Select only when system reverse voltage ≤600 V and fast recovery is required.
VS-3EYH02-M3/45	V_RRM = 1200 V, I_F = 3 A, same DO-214AB package, but higher V_F (1.25 V @ 3 A)	Higher conduction loss reduces efficiency in thermally constrained 3 A designs	Acceptable where thermal margin exists and sourcing favors Vishay distribution channels.

Compared with STTH3L06S and VS-3EYH02-M3/45, the S3Q delivers optimal balance of 1200 V blocking, low 0.93 V forward drop, and industry-standard DO-214AB manufacturability-making it preferred for cost-sensitive, high-reliability 3 A/1200 V rectification where thermal headroom is limited.

Availability

S3Q is available at Aetrix Electronics and suitable for switch mode power supplies, inverters and converters, and industrial HV DC/DC modules requiring stable component supply and long-lifecycle support.

Supply support for S3Q 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 diodes, and MOSFETs for industrial and computing applications.

The S3Q belongs to TSC's high-voltage rectifier product line, engineered for robustness in mains-connected power conversion systems where reliability, thermal stability, and regulatory compliance are critical.

FAQ

What is the maximum junction temperature rating for the S3Q?

The S3Q has a maximum junction temperature (T_J) of +150°C, verified per absolute maximum ratings table. This allows continuous operation in high-ambient environments such as enclosed power supplies or motor drive cabinets. Derating curves in the S3Q datasheet define usable current vs. case temperature, and thermal design must respect R_θJL = 16 °C/W to avoid exceeding 150°C under full 3 A load.

Does the S3Q have a specified reverse recovery time (t_rr)?

No, the S3Q datasheet does not specify reverse recovery time (t_rr). It is characterized as a standard recovery rectifier-not an ultrafast or soft-recovery type. Designers using S3Q in high-frequency (>100 kHz) topologies should verify switching losses empirically or consider alternatives with published t_rr if commutation loss is critical.

Is the S3Q suitable for use in automotive applications?

The S3Q is not qualified to AEC-Q101 and is not recommended for automotive applications. The datasheet explicitly states that TSC products "are not designed for use in medical, life-saving, or life-sustaining applications," and no automotive-grade screening, qualification reports, or PPAP documentation is provided for the S3Q. Use in automotive requires formal qualification and extended temperature validation beyond the S3Q's -55°C to +150°C rating.

What is the marking code on the S3Q device body?

The marking code on the S3Q device body is "S3Q", as confirmed in the Absolute Maximum Ratings table and Marking Diagram section of the datasheet. Additional markings include date code (YW), factory code (F), and green compound indicator (G), all consistent with J-STD-020 Level 1 packaging requirements.

Can the S3Q be used in parallel for higher current capability?

Parallel operation of S3Q devices is not recommended without external balancing-its forward voltage (V_F) has typical variation (0.88–0.93 V @ 3 A) and negative temperature coefficient, which can cause current hogging. For >3 A applications, select a higher-current rated rectifier (e.g., S5Q or equivalent) rather than paralleling S3Q units, unless active current sharing or matched V_F binning is implemented.

S3Q Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: DO-214AB, SMC

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 1200 V

Current - Average Rectified (Io):: 3A

Voltage - Forward (Vf) (Max) @ If:: 1.15 V @ 3 A

Speed:: Standard Recovery >500ns, > 200mA (Io)

Reverse Recovery Time (trr):: -

Current - Reverse Leakage @ Vr:: 10 µA @ 1200 V

Capacitance @ Vr, F:: 27pF @ 4V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: DO-214AB (SMC)

Operating Temperature - Junction:: -55°C ~ 150°C

S3Q FAQ

1.How can I place an order for S3Q through Aetrix?

Please submit a Request for Quotation (RFQ) for S3Q on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for S3Q reliable?

The price and inventory of S3Q are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for S3Q is usually 5 days.

3.What payment methods are accepted for S3Q?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for S3Q transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for S3Q?

S3Q orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your S3Q order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for S3Q?

For technical support, including S3Q datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your S3Q requirements.

6.How does Aetrix verify that S3Q is sourced from the original manufacturer or authorized distributors?

All S3Q products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that S3Q meets industry standards.

7.What is the process for return or replacement of S3Q?

All S3Q units undergo pre-shipment inspection (PSI). If there is an issue with S3Q, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The S3Q part is unused and in its original packaging.

Return procedure for S3Q:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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