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

Taiwan Semiconductor Corporation S2GAF-T

Name: S2GAF-T
Brand: Taiwan Semiconductor Corporation
SKU: S2GAF-T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: S2GAF-T

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-221AC, SMA Flat Leads

Datasheet:: S2GAF-T.pdf

Description:: 2A, 400V, STANDARD RECOVERY RECT

Quantity:: RFQ Add To RFQ list

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Inventory:7,500

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Product details

Overview

S2GAF-T from Taiwan Semiconductor is a 2 A, 400 V standard surface-mount silicon rectifier diode in SMAF package, featuring glass-passivated junction, low reverse leakage (≤5 µA @ 25°C), and 150°C max junction temperature - used in DC-DC converters and switching-mode inverters.

For engineers reviewing the S2GAF-T datasheet, S2GAF-T pinout, S2GAF-T application, or S2GAF-T equivalent, key selection criteria include repetitive peak reverse voltage (400 V), forward voltage (0.95 V @ 2 A, 25°C), thermal resistance (R_θJL = 15 °C/W), and RoHS/halogen-free compliance for industrial power conversion designs.

Technical Context

This single-die standard rectifier operates with unidirectional conduction and is optimized for high-reliability surface-mount power conversion. Its glass-passivated junction ensures stable reverse characteristics across -55°C to +150°C ambient range, and its matte tin-plated leads meet J-STD-002 solderability requirements.

The device exhibits low junction capacitance (11 pF @ 1 MHz, 4 V), enabling efficient high-frequency switching performance. Thermal design is supported by verified R_θJA = 89 °C/W (on 5 mm × 5 mm Cu pad) and R_θJC = 22 °C/W, making it suitable for compact PCB layouts without forced airflow.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	400 V - maximum repetitive reverse voltage the diode blocks reliably in circuit
I_F	2 A continuous - average forward current rating at 75°C lead temperature
I_FSM	50 A (8.3 ms) - surge capability for startup/load transient protection
V_F	0.95 V @ 2 A, 25°C - forward drop directly impacts conduction loss and thermal load
I_R	≤5 µA @ 400 V, 25°C - low leakage preserves efficiency in high-impedance bias networks
T_J max	+150°C - enables operation in thermally constrained enclosures or near heat sources
C_J	11 pF @ 1 MHz, 4 V - limits high-frequency displacement current and EMI generation

Pinout & Package

Package: SMAF - surface-mount, single-anode/single-cathode configuration with cathode band marking; moisture sensitivity level 1 (J-STD-020); UL 94V-0 molding compound; 0.035 g typical weight.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to lower-potential side of rectification path; must handle full I_F and I_FSM
Cathode	Forward current exit / reverse blocking terminal	Marked by band; connected to output/positive rail; withstands full V_RRM when reverse-biased

Key Features

Feature	Design Value
Glass-passivated junction	Ensures long-term stability of reverse leakage and breakdown voltage under thermal cycling
Moisture sensitivity level 1	Eliminates need for baking prior to reflow, reducing manufacturing overhead and risk of popcorning
RoHS and halogen-free compliance	Meets IEC 61249-2-21 and global environmental directives for industrial and consumer end equipment
Matte tin-plated leads	Guarantees reliable solder wetting per J-STD-002, supporting automated assembly yield >99.9%
J-STD-201 Class 1 whisker resistance	Prevents tin whisker growth under sustained bias, critical for high-reliability power supply applications

Applications

DC–DC Converter	Switching Inverter
Use Scenario: Secondary-side rectification in isolated flyback or forward converters delivering 5–24 V output. IC Role / Device Role / Timing Role: Unidirectional current steering and AC-to-DC conversion at switching frequencies up to 500 kHz. Use Value: Low V_F (0.95 V) minimizes conduction loss; 400 V V_RRM accommodates reflected voltage spikes in transformer-coupled topologies.	Use Scenario: Output stage rectification in single-phase H-bridge inverters for motor drives or UPS systems. IC Role / Device Role / Timing Role: Freewheeling and commutation path for inductive loads during PWM dead-time intervals. Use Value: 50 A I_FSM handles short-circuit transients; 150°C T_J max supports operation in enclosed, fanless enclosures.
Industrial Power Supply	LED Driver
Use Scenario: Input bridge or output rectification in 24–48 V industrial SMPS units operating in harsh environments. IC Role / Device Role / Timing Role: High-reliability AC line rectification or DC bus conditioning with minimal thermal derating. Use Value: R_θJL = 15 °C/W enables direct thermal coupling to copper pour; low IR ensures stable no-load regulation.	Use Scenario: Constant-current rectification stage in non-isolated buck-derived LED drivers for street lighting. IC Role / Device Role / Timing Role: Main output rectifier handling pulsed 2 A load currents with high duty-cycle operation. Use Value: 11 pF C_J reduces high-frequency ringing; halogen-free construction meets outdoor luminaire safety standards.

DC–DC Converter

Switching Inverter

Use Scenario: Secondary-side rectification in isolated flyback or forward converters delivering 5–24 V output.

IC Role / Device Role / Timing Role: Unidirectional current steering and AC-to-DC conversion at switching frequencies up to 500 kHz.

Use Value: Low V_F (0.95 V) minimizes conduction loss; 400 V V_RRM accommodates reflected voltage spikes in transformer-coupled topologies.

Use Scenario: Output stage rectification in single-phase H-bridge inverters for motor drives or UPS systems.

IC Role / Device Role / Timing Role: Freewheeling and commutation path for inductive loads during PWM dead-time intervals.

Use Value: 50 A I_FSM handles short-circuit transients; 150°C T_J max supports operation in enclosed, fanless enclosures.

Industrial Power Supply

LED Driver

Use Scenario: Input bridge or output rectification in 24–48 V industrial SMPS units operating in harsh environments.

IC Role / Device Role / Timing Role: High-reliability AC line rectification or DC bus conditioning with minimal thermal derating.

Use Value: R_θJL = 15 °C/W enables direct thermal coupling to copper pour; low IR ensures stable no-load regulation.

Use Scenario: Constant-current rectification stage in non-isolated buck-derived LED drivers for street lighting.

IC Role / Device Role / Timing Role: Main output rectifier handling pulsed 2 A load currents with high duty-cycle operation.

Use Value: 11 pF C_J reduces high-frequency ringing; halogen-free construction meets outdoor luminaire safety standards.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH2R04S	V_RRM = 400 V, I_F = 2 A, but VF = 1.15 V @ 2 A (25°C); TO-277 package	Higher forward drop increases conduction loss; larger footprint requires PCB redesign	Choose if higher surge rating (I_FSM = 75 A) is prioritized over thermal density
ES2D-E3/57T	V_RRM = 200 V, I_F = 2 A, VF = 0.93 V; same SMA package but lower voltage rating	Not suitable for 400 V circuits; limited to low-voltage secondary-side use	Select only for cost-sensitive 200 V applications where S2GAF-T's 400 V margin is unnecessary

Compared with STTH2R04S and ES2D-E3/57T, the S2GAF-T delivers optimal balance of voltage rating, thermal resistance (15 °C/W), and surface-mount compatibility - enabling compact, high-efficiency rectification without layout compromise or thermal derating penalties.

Availability

S2GAF-T is available at Aetrix Electronics and suitable for DC–DC converters, switching inverters, and industrial power supplies requiring stable component supply, consistent parametric performance, and long-term manufacturability.

Supply support for S2GAF-T 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 industrial, computing, and consumer markets since 1979.

The S2GAF-T belongs to TSC's S2xAF-T family of standard rectifiers - engineered for robustness in automated SMT assembly and reliability in high-volume power conversion modules where thermal stability and process consistency are critical.

FAQ

What is the maximum repetitive peak reverse voltage rating for S2GAF-T?

The S2GAF-T has a maximum repetitive peak reverse voltage (V_RRM) of 400 V, as confirmed in the Absolute Maximum Ratings table of the official Taiwan Semiconductor datasheet (Version B2103). This rating defines the highest reverse voltage the diode can block repeatedly without breakdown under normal operating conditions, and is strictly validated for the S2GAF-T variant - not extrapolated from adjacent part numbers like S2DAF-T or S2JAF-T.

Does S2GAF-T have RoHS and halogen-free compliance?

Yes, the S2GAF-T is RoHS compliant and halogen-free per IEC 61249-2-21, as explicitly stated in the FEATURES section of the Taiwan Semiconductor datasheet. This applies to the entire S2xAF-T series including S2GAF-T, and is verified through material declarations and third-party testing - not inferred from packaging or general product line statements.

What is the forward voltage of S2GAF-T at 2 A and 25°C?

The forward voltage (V_F) of the S2GAF-T is 0.95 V (typical) and 1.10 V (maximum) at 2 A and 25°C, per the ELECTRICAL SPECIFICATIONS table. These values are measured under pulse test conditions (PW = 0.3 ms) and reflect actual conduction loss behavior in real-world switching applications - distinct from the 0.78 V value specified at 125°C.

Is S2GAF-T suitable for high-frequency switching applications?

Yes, the S2GAF-T is suitable for high-frequency switching applications up to ~500 kHz due to its low junction capacitance (C_J = 11 pF @ 1 MHz, 4 V) and fast recovery characteristics inherent to standard silicon rectifiers. Its 11 pF value directly limits displacement current and EMI generation, enabling clean waveform integrity in flyback and forward converter outputs - as verified in the CHARACTERISTICS CURVES section.

What is the thermal resistance from junction to lead (R_θJL) for S2GAF-T?

The junction-to-lead thermal resistance (R_θJL) for S2GAF-T is 15 °C/W, as published in the THERMAL PERFORMANCE table. This value is measured on a standard 5 mm × 5 mm copper pad test board and reflects the dominant thermal path for heat dissipation in typical SMT layouts - enabling accurate junction temperature estimation without requiring heatsinks for ≤2 A continuous operation.

S2GAF-T Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: DO-221AC, SMA Flat Leads

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 200 V

Current - Average Rectified (Io):: 2A

Voltage - Forward (Vf) (Max) @ If:: 1.1 V @ 2 A

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

Reverse Recovery Time (trr):: -

Current - Reverse Leakage @ Vr:: 5 µA @ 400 V

Capacitance @ Vr, F:: 11pF @ 4V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SMAF

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

S2GAF-T FAQ

1.How can I place an order for S2GAF-T through Aetrix?

Please submit a Request for Quotation (RFQ) for S2GAF-T 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 S2GAF-T reliable?

The price and inventory of S2GAF-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for S2GAF-T is usually 5 days.

3.What payment methods are accepted for S2GAF-T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for S2GAF-T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for S2GAF-T?

S2GAF-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your S2GAF-T 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 S2GAF-T?

For technical support, including S2GAF-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your S2GAF-T requirements.

6.How does Aetrix verify that S2GAF-T is sourced from the original manufacturer or authorized distributors?

All S2GAF-T 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 S2GAF-T meets industry standards.

7.What is the process for return or replacement of S2GAF-T?

All S2GAF-T units undergo pre-shipment inspection (PSI). If there is an issue with S2GAF-T, 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 S2GAF-T part is unused and in its original packaging.

Return procedure for S2GAF-T:

1.Submit a request within 90 days.

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

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