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

Taiwan Semiconductor Corporation S2GAL

Name: S2GAL
Brand: Taiwan Semiconductor Corporation
SKU: S2GAL
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: S2GAL

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-221AC, SMA Flat Leads

Datasheet:: S2GAL.pdf

Description:: DIODE GEN PURP 400V 2A THIN SMA

Quantity:: RFQ Add To RFQ list

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Inventory:13,865

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Product details

Overview

S2GAL from Taiwan Semiconductor is a 2 A, 400 V standard surface-mount silicon rectifier diode in a Thin SMA package, featuring glass-passivated junction, 50 A surge rating (8.3 ms), and 150 °C max junction temperature - used in DC-DC converters and switching-mode inverters.

For engineers reviewing the S2GAL datasheet, S2GAL pinout, S2GAL application, or S2GAL equivalent, key selection criteria include repetitive peak reverse voltage (400 V), forward voltage at 2 A (0.98 V typ / 1.10 V max @ 25 °C), thermal resistance (R_θJL = 14 °C/W), reverse leakage (≤1 µA @ 25 °C), and RoHS/halogen-free compliance.

Technical Context

The S2GAL is a single-die, unidirectional standard recovery rectifier optimized for medium-voltage, medium-current switching power supplies. Its glass-passivated junction ensures stable reverse characteristics and reliability under thermal cycling.

Designed for automated SMT placement, it meets J-STD-020 moisture sensitivity level 1 and JESD 201 Class 2 whisker resistance. The cathode band indicates polarity, and matte tin-plated leads ensure solderability per J-STD-002.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	400 V - maximum repetitive reverse voltage the device blocks without breakdown
I_F	2 A - continuous average forward current rating at T_A = 75 °C on PCB
I_FSM (8.3 ms)	50 A - non-repetitive surge current capability during transient overloads
V_F @ 2 A, 25 °C	0.98 V (typ), 1.10 V (max) - forward conduction loss impacting efficiency and thermal design
R_θJL	14 °C/W - junction-to-lead thermal resistance enabling direct PCB copper pad heat sinking
I_R @ 400 V, 25 °C	≤1 µA - low reverse leakage critical for high-impedance hold-up and standby circuits

Pinout & Package

Package: Thin SMA - surface-mount, low-profile, single-anode/single-cathode configuration with cathode band marking. Weight: 0.029 g. UL 94V-0 molding compound.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry	Connected to lower-potential side of rectified path; requires adequate trace width for 2 A continuous
Cathode	Forward current exit / polarity indicator	Marked by visible band; connects to output capacitor/inductor node in flyback/buck topologies

Key Features

Feature	Design Value
Glass-passivated junction	Enhances long-term stability of reverse leakage and breakdown voltage under humidity and bias stress
J-STD-020 Level 1 MSL	Enables unlimited floor life before reflow; no baking required prior to assembly
Matte tin-plated leads	Ensures reliable solder wetting and intermetallic formation per J-STD-002 qualification
UL 94V-0 molding compound	Meets flame-retardancy requirements for industrial and consumer end-equipment safety certifications

Applications

DC-DC Converter	Switching Inverter
Use Scenario: Secondary-side rectification in isolated 12 V–48 V output flyback or forward converters. IC Role / Device Role / Timing Role: Unidirectional current steering diode converting transformer AC output to regulated DC. Use Value: 400 V V_RRM provides margin above reflected output + clamp voltage; 2 A I_F supports up to ~60 W output power.	Use Scenario: Freewheeling path in half-bridge motor drive inverters operating up to 300 V DC bus. IC Role / Device Role / Timing Role: Clamping diode providing safe current recirculation during MOSFET turn-off transitions. Use Value: 50 A I_FSM handles short-duration shoot-through or inductive kickback surges without failure.
AC-DC Adapter	Industrial Power Supply
Use Scenario: Output rectification in universal-input (90–264 V_AC) offline adapters delivering ≤24 V/2 A. IC Role / Device Role / Timing Role: Main output rectifier in low-cost, high-volume wall-wart designs. Use Value: Thin SMA footprint enables compact board layout; halogen-free/RoHS compliance satisfies global regulatory requirements.	Use Scenario: Auxiliary supply rectification in programmable logic controller (PLC) power modules. IC Role / Device Role / Timing Role: Isolated auxiliary rail generation from main transformer winding. Use Value: 150 °C T_JMAX and R_θJL = 14 °C/W support operation in high-ambient industrial enclosures without forced cooling.

DC-DC Converter

Switching Inverter

Use Scenario: Secondary-side rectification in isolated 12 V–48 V output flyback or forward converters.

IC Role / Device Role / Timing Role: Unidirectional current steering diode converting transformer AC output to regulated DC.

Use Value: 400 V V_RRM provides margin above reflected output + clamp voltage; 2 A I_F supports up to ~60 W output power.

Use Scenario: Freewheeling path in half-bridge motor drive inverters operating up to 300 V DC bus.

IC Role / Device Role / Timing Role: Clamping diode providing safe current recirculation during MOSFET turn-off transitions.

Use Value: 50 A I_FSM handles short-duration shoot-through or inductive kickback surges without failure.

AC-DC Adapter

Industrial Power Supply

Use Scenario: Output rectification in universal-input (90–264 V_AC) offline adapters delivering ≤24 V/2 A.

IC Role / Device Role / Timing Role: Main output rectifier in low-cost, high-volume wall-wart designs.

Use Value: Thin SMA footprint enables compact board layout; halogen-free/RoHS compliance satisfies global regulatory requirements.

Use Scenario: Auxiliary supply rectification in programmable logic controller (PLC) power modules.

IC Role / Device Role / Timing Role: Isolated auxiliary rail generation from main transformer winding.

Use Value: 150 °C T_JMAX and R_θJL = 14 °C/W support operation in high-ambient industrial enclosures without forced cooling.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH2R04	V_RRM = 400 V, I_F = 2 A, but faster recovery (t_rr ≈ 50 ns vs. S2GAL's ~2 µs); higher V_F (~1.3 V @ 2 A)	Better suited for higher-frequency SMPS (>100 kHz); less optimal for cost-sensitive <50 kHz designs	Choose STTH2R04 when EMI reduction or reduced switching loss is prioritized over conduction loss
SB240	V_RRM = 400 V, I_F = 2 A, DO-15 package (axial leaded); no MSL rating; higher R_θJA (~100 °C/W)	Requires through-hole assembly; unsuitable for automated SMT lines or space-constrained boards	Choose SB240 only for legacy repair, prototyping, or non-automated production where footprint flexibility exists

Compared with STTH2R04 and SB240, the S2GAL delivers optimal balance of cost, SMT compatibility, thermal performance (R_θJL = 14 °C/W), and reliability (MSL Level 1, halogen-free) for mainstream 25–100 kHz switching power supplies.

Availability

S2GAL is available at Aetrix Electronics and suitable for DC-DC converters, switching inverters, and industrial power supplies requiring stable component supply, full RoHS/halogen-free compliance, and J-STD-020 Level 1 handling.

Supply support for S2GAL 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 S2GAL belongs to TSC's S2xAL standard rectifier family, engineered for cost-effective, high-yield SMT deployment in mid-power AC-DC and DC-DC conversion systems.

FAQ

What is the maximum junction temperature rating for the S2GAL?

The S2GAL has a maximum junction temperature (T_J) rating of +150 °C, verified per absolute maximum ratings table. This allows reliable operation in thermally demanding environments such as enclosed industrial power supplies. Derating curves confirm usable current capacity down to 0 A at 150 °C ambient when mounted on standard PCB copper pads. The S2GAL must not exceed this limit to maintain parametric integrity and long-term reliability.

Does the S2GAL have a specified reverse recovery time (t_rr)?

No, the S2GAL datasheet does not specify reverse recovery time (t_rr). It is characterized as a standard recovery rectifier, with typical t_rr in the microsecond range (≈2 µs). For designs requiring fast recovery (e.g., >100 kHz switching), engineers should verify waveform behavior empirically or consider alternatives like STTH2R04. The S2GAL datasheet emphasizes V_F, I_R, and thermal parameters-not switching speed.

Is the S2GAL suitable for use in automotive applications?

The S2GAL is not qualified to AEC-Q101 or automotive-grade reliability standards. While its 150 °C T_JMAX and robust construction support harsh environments, Taiwan Semiconductor explicitly states these devices are "not designed for use in medical, life-saving, or life-sustaining applications" - a category that includes automotive safety-critical systems. For automotive infotainment or body electronics, formal qualification and PPAP documentation would be required beyond the S2GAL's current specification.

What is the marking code printed on the S2GAL device body?

The S2GAL is marked with "S2GAL" on its top surface, per the ordering information table and marking diagram in the datasheet. This 5-character laser marking includes the full part number and distinguishes it from other variants (e.g., S2DAL, S2JAL). No date code or factory code is included in the primary device marking - those appear separately as "YW" and "F" per the marking diagram, but are not part of the S2GAL identity.

How does the Thin SMA package of the S2GAL compare to standard SMA in thermal performance?

The Thin SMA package of the S2GAL reduces profile height versus standard SMA but maintains identical leadframe geometry and thermal interface area. Its R_θJL is 14 °C/W - matching standard SMA rectifiers - because thermal conduction occurs primarily through the leads, not the mold compound. However, R_θJA is 74 °C/W (tested on 5 mm × 5 mm Cu pad), slightly higher than some thicker SMA variants due to reduced lateral heat spreading volume in the thinner body.

S2GAL 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):: 400 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:: 1 µA @ 400 V

Capacitance @ Vr, F:: 12pF @ 4V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: Thin SMA

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

S2GAL FAQ

1.How can I place an order for S2GAL through Aetrix?

Please submit a Request for Quotation (RFQ) for S2GAL 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 S2GAL reliable?

The price and inventory of S2GAL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for S2GAL is usually 5 days.

3.What payment methods are accepted for S2GAL?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for S2GAL transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for S2GAL?

S2GAL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your S2GAL 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 S2GAL?

For technical support, including S2GAL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your S2GAL requirements.

6.How does Aetrix verify that S2GAL is sourced from the original manufacturer or authorized distributors?

All S2GAL 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 S2GAL meets industry standards.

7.What is the process for return or replacement of S2GAL?

All S2GAL units undergo pre-shipment inspection (PSI). If there is an issue with S2GAL, 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 S2GAL part is unused and in its original packaging.

Return procedure for S2GAL:

1.Submit a request within 90 days.

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

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