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

Taiwan Semiconductor Corporation S1GF-T

Name: S1GF-T
Brand: Taiwan Semiconductor Corporation
SKU: S1GF-T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: S1GF-T

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-221AC, SMA Flat Leads

Datasheet:: S1GF-T.pdf

Description:: 1A, 400V, STANDARD RECOVERY RECT

Quantity:: RFQ Add To RFQ list

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Inventory:7,500

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Product details

Overview

S1GF-T from Taiwan Semiconductor is a 1 A, 400 V repetitive peak reverse voltage (V_RRM) surface-mount standard rectifier diode in SMAF package, featuring glass-passivated junction, low reverse leakage (≤5 µA at 25°C), and 150°C maximum junction temperature - used in DC-DC converters and switching-mode inverters.

For engineers reviewing the S1GF-T datasheet, S1GF-T pinout, S1GF-T application, or S1GF-T equivalent, key selection criteria include forward voltage drop at 1.0 A (0.94 V typ., 1.10 V max. at 25°C), surge capability (30 A @ 8.3 ms), thermal resistance (R_θJL = 15 °C/W), and RoHS/halogen-free compliance for industrial power conversion designs.

Technical Context

The S1GF-T is a single-die, unidirectional silicon rectifier optimized for high-efficiency, medium-voltage switching applications. Its glass-passivated junction ensures stable reverse characteristics and low IR across temperature (≤150 µA at 125°C), while the SMAF package supports automated placement and meets J-STD-020 Level 1 moisture sensitivity.

Thermal performance is characterized with R_θJA = 89 °C/W on a 5 mm × 5 mm Cu pad PCB, enabling reliable operation up to 150°C junction temperature. The device exhibits typical junction capacitance of 7 pF at 1 MHz and 4.0 V reverse bias, supporting fast-switching behavior in SMPS front-end and flyback stages.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	400 V - Maximum repetitive reverse blocking voltage; defines safe operating range in 350–400 V DC bus applications.
I_F	1 A continuous - Rated average forward current; supports compact power supplies with minimal heatsinking.
V_F @ 1.0 A, 25°C	0.94 V typ., 1.10 V max. - Directly impacts conduction loss and thermal rise in rectification stage.
I_FSM @ 8.3 ms	30 A - Surge rating determines robustness against line transients and startup inrush in offline converters.
R_θJL	15 °C/W - Low junction-to-lead thermal resistance enables efficient heat transfer to PCB copper, reducing thermal derating.
Junction Temp (T_J)	−55°C to +150°C - Wide operating range supports industrial environments and sealed enclosures without active cooling.
C_J @ 1 MHz, 4 V	7 pF - Low capacitance minimizes switching losses and EMI generation during high-frequency turn-off.

Pinout & Package

Package: SMAF - Surface-mount, molded plastic case with matte tin-plated leads; polarity indicated by cathode band; UL 94V-0 rated; weight ≈ 0.035 g.

Pin/Terminal	Circuit Role	Design Meaning
Anode (A)	Forward current entry point	Connected to lower-potential side (e.g., transformer secondary center-tap or switch node) in half-wave or full-wave configurations.
Cathode (K)	Forward current exit / reverse-blocking terminal	Marked by band; ties to output filter capacitor positive rail or common return; blocks 400 V reverse voltage.

Key Features

Feature	Design Value
Glass-passivated junction	Ensures stable reverse leakage (<5 µA @ 25°C) and long-term reliability under humidity and thermal cycling.
Moisture sensitivity level 1	Eliminates need for baking prior to reflow; compatible with standard SMT assembly lines without special handling.
RoHS & halogen-free	Meets IEC 61249-2-21 and EU RoHS directives; suitable for export-compliant industrial and consumer power products.
J-STD-002 solderability	Matte tin-plated leads ensure consistent wetting and joint integrity during lead-free reflow (260°C peak).
JESD 201 Class 1 whisker resistance	Prevents tin whisker growth under long-term storage or bias, critical for automotive-adjacent and telecom infrastructure use.

Applications

DC–DC Converter	Switching Inverter
Use Scenario: Secondary-side rectification in isolated 12 V/24 V output buck-derived converters. IC Role / Device Role / Timing Role: Unidirectional power switch converting high-frequency AC from transformer secondary into regulated DC. Use Value: Low V_F (0.94 V typ.) reduces conduction loss; 150°C T_J rating allows operation in confined spaces without forced air.	Use Scenario: Output rectification in 3-phase motor drive inverters with 400 V DC link. IC Role / Device Role / Timing Role: Freewheeling and commutation path for inductive loads during PWM dead-time intervals. Use Value: 30 A I_FSM withstands motor startup surges; 7 pF C_J limits capacitive turn-off current and EMI.
General-Purpose Power Supply	Industrial SMPS Front-End
Use Scenario: Input rectification in universal-input (85–265 VAC) offline adapters rated ≤15 W. IC Role / Device Role / Timing Role: Bridge or single-diode rectifier in voltage-doubler or half-wave topology. Use Value: V_RRM = 400 V provides 2× safety margin over 265 VAC peak (375 V); low IR prevents thermal runaway at elevated ambient.	Use Scenario: Auxiliary supply rectification in PLC power modules requiring extended temperature operation. IC Role / Device Role / Timing Role: Isolated auxiliary rail generation from main DC bus via flyback transformer. Use Value: −55°C to +150°C T_J range supports operation in unventilated control cabinets; UL 94V-0 molding compound enhances fire safety.

DC–DC Converter

Switching Inverter

Use Scenario: Secondary-side rectification in isolated 12 V/24 V output buck-derived converters.

IC Role / Device Role / Timing Role: Unidirectional power switch converting high-frequency AC from transformer secondary into regulated DC.

Use Value: Low V_F (0.94 V typ.) reduces conduction loss; 150°C T_J rating allows operation in confined spaces without forced air.

Use Scenario: Output rectification in 3-phase motor drive inverters with 400 V DC link.

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

Use Value: 30 A I_FSM withstands motor startup surges; 7 pF C_J limits capacitive turn-off current and EMI.

General-Purpose Power Supply

Industrial SMPS Front-End

Use Scenario: Input rectification in universal-input (85–265 VAC) offline adapters rated ≤15 W.

IC Role / Device Role / Timing Role: Bridge or single-diode rectifier in voltage-doubler or half-wave topology.

Use Value: V_RRM = 400 V provides 2× safety margin over 265 VAC peak (375 V); low IR prevents thermal runaway at elevated ambient.

Use Scenario: Auxiliary supply rectification in PLC power modules requiring extended temperature operation.

IC Role / Device Role / Timing Role: Isolated auxiliary rail generation from main DC bus via flyback transformer.

Use Value: −55°C to +150°C T_J range supports operation in unventilated control cabinets; UL 94V-0 molding compound enhances fire safety.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH1R04U	V_RRM = 400 V, I_F = 1 A, V_F = 0.95 V @ 1 A (25°C), but TO-277 package (higher R_θJA ≈ 110 °C/W)	Requires larger PCB footprint and additional thermal relief; less suitable for ultra-compact layouts	Choose when higher surge rating (I_FSM = 50 A) is prioritized over space-constrained SMT assembly
MBR140SFT1G	40 V V_RRM, Schottky structure - lower V_F (~0.52 V), but unsuitable for 400 V blocking; not a direct voltage-replacement	Only viable in low-voltage (<60 V) DC-DC outputs; cannot replace S1GF-T in 400 V applications	Select only for secondary-side synchronous rectification where V_RRM < 100 V and efficiency > thermal margin

Compared with STTH1R04U and MBR140SFT1G, the S1GF-T uniquely balances 400 V blocking, 1 A current, SMAF compactness, and 15 °C/W R_θJL - making it optimal for space-limited, thermally constrained industrial SMPS where both voltage rating and manufacturability matter.

Availability

S1GF-T is available at Aetrix Electronics and suitable for DC–DC converters, switching inverters, and general-purpose power supplies requiring stable component supply, consistent parametric performance, and full traceability across production lots.

Supply support for S1GF-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, specializing in power rectifiers, TVS diodes, MOSFETs, and LED drivers since 1979.

The S1GF-T belongs to TSC's S1xF-T family of standard surface-mount rectifiers, designed specifically for cost-sensitive, high-volume industrial and consumer power conversion systems demanding reliability, RoHS compliance, and seamless SMT integration.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) for the S1GF-T?

The S1GF-T has a V_RRM of 400 V, as confirmed in the Absolute Maximum Ratings table of the official Taiwan Semiconductor datasheet (Version B2103). This value is fixed per the S1GF-T marking code and distinguishes it from other variants in the S1xF-T series (e.g., S1DF-T = 200 V, S1MF-T = 1000 V). Exceeding 400 V in continuous reverse bias risks avalanche breakdown and permanent damage to the S1GF-T.

Does the S1GF-T support lead-free reflow soldering?

Yes, the S1GF-T features matte tin-plated leads compliant with J-STD-002 for solderability, and its SMAF package is rated for lead-free reflow profiles up to 260°C peak temperature. The device meets J-STD-020 Level 1 moisture sensitivity, eliminating pre-bake requirements - ensuring robust solder joint formation without voiding or dewetting during standard SMT assembly of the S1GF-T.

What is the forward voltage (V_F) of the S1GF-T at 1.0 A and 125°C?

At 1.0 A forward current and 125°C junction temperature, the S1GF-T exhibits a forward voltage of 0.83 V (typical) and 0.93 V (maximum), per the Electrical Specifications table in the Taiwan Semiconductor datasheet. This reduced V_F versus room temperature (0.94 V typ.) reflects improved carrier injection at elevated temperature - a key parameter for thermal design validation of the S1GF-T in high-ambient environments.

Is the S1GF-T halogen-free and RoHS compliant?

Yes, the S1GF-T is certified RoHS compliant and halogen-free per IEC 61249-2-21, as explicitly stated in the FEATURES section of the official datasheet. The molding compound contains no brominated flame retardants or chlorine-based additives, and all homogeneous materials meet EU Directive 2011/65/EU limits - confirming full regulatory compliance for the S1GF-T in global commercial and industrial markets.

What does the "F" in S1GF-T signify in the ordering code?

The "F" in S1GF-T denotes the voltage grade within the S1xF-T family, corresponding to 400 V V_RRM. Per the Ordering Information table, "x" maps directly to voltage: D=200 V, G=400 V, J=600 V, K=800 V, M=1000 V. The "-T" suffix indicates tape-and-reel packaging (7,500 units per reel), and the marking code laser-etched on the S1GF-T body is "S1GF".

S1GF-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):: 400 V

Current - Average Rectified (Io):: 1A

Voltage - Forward (Vf) (Max) @ If:: 1.1 V @ 1 A

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

Reverse Recovery Time (trr):: -

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

Capacitance @ Vr, F:: 7pF @ 4V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SMAF

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

S1GF-T FAQ

1.How can I place an order for S1GF-T through Aetrix?

Please submit a Request for Quotation (RFQ) for S1GF-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 S1GF-T reliable?

The price and inventory of S1GF-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for S1GF-T is usually 5 days.

3.What payment methods are accepted for S1GF-T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for S1GF-T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for S1GF-T?

S1GF-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your S1GF-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 S1GF-T?

For technical support, including S1GF-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your S1GF-T requirements.

6.How does Aetrix verify that S1GF-T is sourced from the original manufacturer or authorized distributors?

All S1GF-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 S1GF-T meets industry standards.

7.What is the process for return or replacement of S1GF-T?

All S1GF-T units undergo pre-shipment inspection (PSI). If there is an issue with S1GF-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 S1GF-T part is unused and in its original packaging.

Return procedure for S1GF-T:

1.Submit a request within 90 days.

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

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