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

Taiwan Semiconductor Corporation SF38G-A

Name: SF38G-A
Brand: Taiwan Semiconductor Corporation
SKU: SF38G-A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SF38G-A

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-201AD, Axial

Datasheet:: SF38G-A.pdf

Description:: 35NS, 3A, 600V, SUPER FAST RECOV

Quantity:: RFQ Add To RFQ list

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Inventory:5,531

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Product details

Overview

SF38G-A from Taiwan Semiconductor is a 3A, 600V super fast rectifier diode in DO-201AD package, featuring 1.70V forward voltage at 3A/25°C, 35ns reverse recovery time, and 125A surge capability - used in high-efficiency DC-DC converters and switching inverters requiring fast recovery and low conduction loss.

For engineers reviewing the SF38G-A datasheet, SF38G-A pinout, SF38G-A application, or SF38G-A equivalent, key selection criteria include V_RRM = 600V, I_F = 3A, t_rr = 35ns, thermal resistance R_θJL = 10°C/W, and DO-201AD mechanical compatibility with standard through-hole power rectifier footprints.

Technical Context

This single-die silicon rectifier operates as a unidirectional current switch with super-fast recovery (t_rr ≤ 35ns), optimized for high-frequency switching topologies. Its 600V V_RRM rating supports 400V AC input rectification and 300–400V DC bus applications.

Thermal performance is defined by R_θJL = 10°C/W and R_θJA = 35°C/W, enabling reliable operation up to T_J = 150°C. Reverse leakage remains ≤5µA at 25°C and ≤100µA at 125°C under rated V_R.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	600 V - supports 400V AC line rectification with safety margin
I_F	3 A continuous - suitable for mid-power SMPS output stages
t_rr	35 ns - enables operation up to ~3 MHz switching frequency without excessive switching loss
V_F	1.70 V @ 3A, 25°C - determines conduction loss in freewheeling and output rectification paths
I_FSM	125 A @ 8.3ms - withstands inrush and transient overloads in converter startup
R_θJL	10 °C/W - allows direct PCB copper pad heat sinking for thermal management
C_J	60 pF @ 4V - impacts high-frequency EMI and snubber design in hard-switched circuits

Pinout & Package

DO-201AD axial-leaded package with cathode band marking; leads are pure tin-plated, solderable per J-STD-002, and meet JESD 201 Class 1A whisker resistance.

Pin/Terminal	Circuit Role	Design Meaning
Anode (unmarked end)	Current entry terminal during forward conduction	Connected to lower-potential node (e.g., switch node in buck freewheel path)
Cathode (banded end)	Current exit terminal during forward conduction	Connected to higher-potential node (e.g., output rail or ground return)

Key Features

Feature	Design Value
Super-fast recovery (t_rr ≤ 35 ns)	Reduces switching losses and EMI in 100 kHz–1 MHz SMPS designs
Low forward voltage (V_F = 1.70 V)	Lowers conduction loss vs. standard fast rectifiers, improving efficiency at 3A load
High surge rating (I_FSM = 125 A)	Survives repetitive inrush events in offline AC-DC front-end and motor drive circuits
RoHS & halogen-free compliance	Meets IEC 61249-2-21 and environmental requirements for industrial and consumer end equipment
UL 94V-0 molding compound	Ensures flame-retardant reliability in enclosed power supply enclosures

Applications

DC-DC Converter Output Rectification	Switching Inverter Freewheeling
Use Scenario: Secondary-side rectification in isolated flyback or forward converters delivering 12–48V at up to 3A. IC Role / Device Role / Timing Role: Unidirectional current valve converting high-frequency AC from transformer secondary to regulated DC output. Use Value: 35ns t_rr minimizes reverse recovery charge loss; 1.70V V_F reduces conduction loss versus standard fast diodes.	Use Scenario: Freewheeling path across inductive loads (e.g., BLDC motor phases or solenoid drivers) in half-bridge inverters. IC Role / Device Role / Timing Role: Provides low-loss current recirculation path during high-side switch off-time. Use Value: 125A I_FSM handles motor stall currents; 600V V_RRM accommodates 400V DC bus with margin.
AC-DC Front-End Rectification	Industrial Power Supply Hold-Up
Use Scenario: Bridge rectifier leg in universal-input (85–265V AC) offline SMPS with PFC stage. IC Role / Device Role / Timing Role: High-voltage, high-surge rectifier handling peak line voltages up to 375V. Use Value: 600V V_RRM provides >100% margin over 375V peak; 10°C/W R_θJL enables direct heatsinking.	Use Scenario: Output hold-up rectifier in telecom or server PSUs maintaining 12V/48V during brief AC dropout. IC Role / Device Role / Timing Role: Maintains DC output continuity by conducting stored capacitor energy into load. Use Value: Low V_F preserves hold-up time; 150°C T_Jmax ensures reliability under sustained overload conditions.

DC-DC Converter Output Rectification

Switching Inverter Freewheeling

Use Scenario: Secondary-side rectification in isolated flyback or forward converters delivering 12–48V at up to 3A.

IC Role / Device Role / Timing Role: Unidirectional current valve converting high-frequency AC from transformer secondary to regulated DC output.

Use Value: 35ns t_rr minimizes reverse recovery charge loss; 1.70V V_F reduces conduction loss versus standard fast diodes.

Use Scenario: Freewheeling path across inductive loads (e.g., BLDC motor phases or solenoid drivers) in half-bridge inverters.

IC Role / Device Role / Timing Role: Provides low-loss current recirculation path during high-side switch off-time.

Use Value: 125A I_FSM handles motor stall currents; 600V V_RRM accommodates 400V DC bus with margin.

AC-DC Front-End Rectification

Industrial Power Supply Hold-Up

Use Scenario: Bridge rectifier leg in universal-input (85–265V AC) offline SMPS with PFC stage.

IC Role / Device Role / Timing Role: High-voltage, high-surge rectifier handling peak line voltages up to 375V.

Use Value: 600V V_RRM provides >100% margin over 375V peak; 10°C/W R_θJL enables direct heatsinking.

Use Scenario: Output hold-up rectifier in telecom or server PSUs maintaining 12V/48V during brief AC dropout.

IC Role / Device Role / Timing Role: Maintains DC output continuity by conducting stored capacitor energy into load.

Use Value: Low V_F preserves hold-up time; 150°C T_Jmax ensures reliability under sustained overload conditions.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH3L06S	V_RRM = 600V, I_F = 3A, t_rr = 35ns, V_F = 1.75V @ 3A - slightly higher V_F, same DO-201AD package	Identical mounting and thermal interface; marginally higher conduction loss at full load	Drop-in replacement where 0.05V V_F increase is acceptable
ES3J	V_RRM = 600V, I_F = 3A, t_rr = 35ns, V_F = 1.70V - same electrical specs, but JEDEC DO-204AL (similar to DO-201AD) with minor lead spacing variation	Requires verification of PCB land pattern compatibility due to ±0.2mm lead pitch tolerance difference	Valid alternative if board layout allows DO-204AL footprint

Compared with STTH3L06S and ES3J, SF38G-A offers identical V_RRM/I_F/t_rr ratings and lowest V_F among the three, with guaranteed DO-201AD mechanical compliance and RoHS/halogen-free certification per IEC 61249-2-21.

Availability

SF38G-A is available at Aetrix Electronics and suitable for DC-DC converters, switching inverters, and AC-DC front-end rectification requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for SF38G-A 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 devices, and MOSFETs.

The SF3xG-A series was designed specifically for high-efficiency, high-reliability switching power supplies - emphasizing fast recovery, low V_F, and robust surge capability in cost-sensitive industrial and consumer power applications.

FAQ

What is the maximum junction temperature rating for SF38G-A?

The SF38G-A has a maximum junction temperature (T_J) rating of +150°C, verified per absolute maximum ratings in the official Taiwan Semiconductor datasheet revision B2105. This allows reliable operation in enclosed power supplies and industrial environments where ambient temperatures exceed 85°C, provided thermal design maintains junction temperature below this limit using the specified R_θJL = 10°C/W path.

Does SF38G-A have a halogen-free construction?

Yes, SF38G-A is halogen-free in accordance with IEC 61249-2-21, as confirmed in the "Features" section of the Taiwan Semiconductor datasheet. The molding compound contains no bromine, chlorine, or other halogen elements, supporting environmental compliance for export to EU, Japan, and other regulated markets without requiring additional material declarations.

What is the reverse recovery time (t_rr) specification for SF38G-A?

The SF38G-A reverse recovery time is specified as ≤35 ns under test conditions of I_F = 0.5A, I_R = 1.0A, and I_rr = 0.25A. This value is measured per JEDEC standards and applies across the full operating temperature range, making SF38G-A suitable for high-frequency switching applications such as 300–500 kHz DC-DC converters where fast recovery minimizes switching loss.

Is SF38G-A compatible with lead-free reflow soldering processes?

Yes, SF38G-A features pure tin-plated leads compliant with J-STD-002 for solderability, and its DO-201AD package is rated for lead-free reflow profiles. The device withstands peak temperatures up to 260°C for 10 seconds, meeting IPC/JEDEC J-STD-020 moisture sensitivity level (MSL) requirements for standard tape-and-reel packaging.

What marking code appears on the SF38G-A device body?

The SF38G-A is marked with "SF38G" on the device body, followed by a green compound indicator (G), date code (YWW), and factory code (F), as shown in the "Marking Diagram" section of the Taiwan Semiconductor datasheet. This marking distinguishes it from lower-voltage variants (e.g., SF31G-A through SF37G-A) and confirms its 600V V_RRM rating.

SF38G-A Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: DO-201AD, Axial

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 600 V

Current - Average Rectified (Io):: 3A

Voltage - Forward (Vf) (Max) @ If:: 1.7 V @ 3 A

Speed:: Fast Recovery =< 500ns, > 200mA (Io)

Reverse Recovery Time (trr):: 35 ns

Current - Reverse Leakage @ Vr:: 5 µA @ 600 V

Capacitance @ Vr, F:: 60pF @ 4V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-201AD

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

SF38G-A FAQ

1.How can I place an order for SF38G-A through Aetrix?

Please submit a Request for Quotation (RFQ) for SF38G-A 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 SF38G-A reliable?

The price and inventory of SF38G-A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SF38G-A is usually 5 days.

3.What payment methods are accepted for SF38G-A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SF38G-A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SF38G-A?

SF38G-A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SF38G-A 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 SF38G-A?

For technical support, including SF38G-A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SF38G-A requirements.

6.How does Aetrix verify that SF38G-A is sourced from the original manufacturer or authorized distributors?

All SF38G-A 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 SF38G-A meets industry standards.

7.What is the process for return or replacement of SF38G-A?

All SF38G-A units undergo pre-shipment inspection (PSI). If there is an issue with SF38G-A, 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 SF38G-A part is unused and in its original packaging.

Return procedure for SF38G-A:

1.Submit a request within 90 days.

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

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