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

Taiwan Semiconductor Corporation SF45G

Name: SF45G
Brand: Taiwan Semiconductor Corporation
SKU: SF45G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SF45G

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-201AD, Axial

Datasheet:: SF45G.pdf

Description:: DIODE GEN PURP 300V 4A DO201AD

Quantity:: RFQ Add To RFQ list

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Inventory:2,500

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Product details

Overview

SF45G from Taiwan Semiconductor is a 4A, 400V super fast recovery rectifier diode in DO-201AD package, featuring 35ns reverse recovery time, 1.3V forward voltage at 4A/25°C, and 125A surge capability - deployed in high-frequency switching mode power supplies and freewheeling paths.

For engineers reviewing the SF45G datasheet, SF45G pinout, SF45G application, or SF45G equivalent, key selection criteria include V_RRM = 400V, t_rr = 35ns, V_F = 1.3V @ 4A, R_θJA = 25°C/W, and DO-201AD mechanical compatibility with automated SMT assembly.

Technical Context

The SF45G employs a single-die silicon PN junction optimized for fast switching in DC-DC converters and inverters, with specified t_rr ≤ 35ns under IF = 0.5A / IR = 1.0A / I_rr = 0.25A test conditions and junction capacitance of 80pF at 1MHz/4V.

It operates across -55°C to +150°C junction temperature range, supports 125A non-repetitive surge (8.3ms half-sine), and maintains IR ≤ 5µA at 25°C and ≤ 500µA at 125°C under rated reverse voltage.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	400 V - maximum repetitive reverse blocking voltage; defines safe operating limit in 400V-rated SMPS output stages
I_F	4 A - continuous average forward current; determines heatsink sizing in convection-cooled 50–100W converters
t_rr	35 ns - reverse recovery time; enables operation up to ~3 MHz switching frequency with low commutation loss
V_F	1.3 V @ 4A, 25°C - forward voltage drop; contributes directly to conduction loss (5.2W at full load)
I_FSM	125 A - peak surge current rating; withstands inrush and fault transients in industrial power supplies
R_θJA	25 °C/W - junction-to-ambient thermal resistance; requires ≥ 1.5 cm² copper pad for T_J ≤ 125°C at 4A
C_J	80 pF @ 1MHz, 4V - junction capacitance; impacts EMI filtering design and snubber sizing in high-dV/dt circuits

Pinout & Package

Package: DO-201AD - axial-lead, molded plastic case with cathode band marking; UL 94V-0 rated compound; pure tin-plated leads compliant with J-STD-002 solderability.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry node	Connected to lower-potential side (e.g., switch node in buck converter freewheel path)
Cathode	Forward current exit node	Marked by band; ties to higher-potential rail (e.g., output capacitor positive terminal)

Key Features

Feature	Design Value
Super fast recovery (t_rr ≤ 35ns)	Reduces switching losses and EMI generation in 100–500 kHz SMPS designs
Low V_F = 1.3V @ 4A	Minimizes conduction loss versus standard FRDs; improves efficiency in 24–48V output rails
DO-201AD mechanical standardization	Enables drop-in replacement in legacy through-hole and surface-mount (gull-wing formed) layouts
125A I_FSM rating	Supports robust start-up and overload handling without bond-wire fusing in industrial converters
AEC-Q101 qualified option (SF45GH)	Validated for automotive under-hood temperature cycling and vibration per stress test requirements

Applications

DC-DC Converter Output Rectification	Switching Inverter Freewheel Diode
Use Scenario: High-efficiency isolated flyback or forward converter delivering 24–48V/3–5A output. IC Role / Device Role / Timing Role: Output rectifier conducting during transformer reset phase; handles 4A DC with minimal V_F-related loss. Use Value: 1.3V V_F reduces conduction loss by ~15% vs. typical 1.5V FRD, improving full-load efficiency by 0.4–0.6%.	Use Scenario: Three-phase motor drive inverter leg using IGBTs with active clamping. IC Role / Device Role / Timing Role: Freewheeling path for inductive load current during IGBT off-time; recovers within 35ns to prevent shoot-through. Use Value: 35ns t_rr ensures clean commutation at 20kHz PWM, suppressing voltage spikes >100V.
AC-DC PFC Boost Diode	Industrial UPS Hold-Up Rectifier
Use Scenario: Continuous-conduction-mode (CCM) boost PFC stage in 300–500W server PSU. IC Role / Device Role / Timing Role: Boost rectifier conducting during MOSFET off-time; blocks 400V reverse voltage with low leakage. Use Value: 5µA IR at 25°C minimizes standby loss; 80pF C_J limits capacitive turn-on current in high-frequency PFC controllers.	Use Scenario: Battery-backed 48V telecom rectifier module requiring hold-up during AC failure. IC Role / Device Role / Timing Role: Input-side OR-ing diode isolating bulk capacitor bank from failed input; sustains 4A continuous load. Use Value: 150°C T_JMAX and 25°C/W R_θJA allow reliable 4A operation on 2-layer PCB without forced air.

DC-DC Converter Output Rectification

Switching Inverter Freewheel Diode

Use Scenario: High-efficiency isolated flyback or forward converter delivering 24–48V/3–5A output.

IC Role / Device Role / Timing Role: Output rectifier conducting during transformer reset phase; handles 4A DC with minimal V_F-related loss.

Use Value: 1.3V V_F reduces conduction loss by ~15% vs. typical 1.5V FRD, improving full-load efficiency by 0.4–0.6%.

Use Scenario: Three-phase motor drive inverter leg using IGBTs with active clamping.

IC Role / Device Role / Timing Role: Freewheeling path for inductive load current during IGBT off-time; recovers within 35ns to prevent shoot-through.

Use Value: 35ns t_rr ensures clean commutation at 20kHz PWM, suppressing voltage spikes >100V.

AC-DC PFC Boost Diode

Industrial UPS Hold-Up Rectifier

Use Scenario: Continuous-conduction-mode (CCM) boost PFC stage in 300–500W server PSU.

IC Role / Device Role / Timing Role: Boost rectifier conducting during MOSFET off-time; blocks 400V reverse voltage with low leakage.

Use Value: 5µA IR at 25°C minimizes standby loss; 80pF C_J limits capacitive turn-on current in high-frequency PFC controllers.

Use Scenario: Battery-backed 48V telecom rectifier module requiring hold-up during AC failure.

IC Role / Device Role / Timing Role: Input-side OR-ing diode isolating bulk capacitor bank from failed input; sustains 4A continuous load.

Use Value: 150°C T_JMAX and 25°C/W R_θJA allow reliable 4A operation on 2-layer PCB without forced air.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH4R004D	V_RRM = 400V, t_rr = 30ns, V_F = 1.25V @ 4A - slightly faster and lower V_F, but DO-201AD footprint identical	Optimized for <100kHz PFC; marginally better EMI performance due to lower t_rr	Preferred where <5ns t_rr reduction justifies STMicro sourcing; same layout, no requalification needed
ES4D-E3/54	V_RRM = 400V, t_rr = 35ns, V_F = 1.35V @ 4A - identical recovery, +0.05V V_F, same DO-201AD package	Designed for high-reliability industrial power; JEDEC-qualified per JESD22-A108	Recommended when extended temperature cycling validation (−55°C to +150°C) is required beyond standard qualification

Compared with STTH4R004D and ES4D-E3/54, the SF45G offers balanced trade-offs: identical t_rr to ES4D-E3/54 and lower cost than STTH4R004D, while maintaining full DO-201AD mechanical and thermal compatibility for seamless BOM substitution.

Availability

SF45G is available at Aetrix Electronics and suitable for DC-DC converters, switching inverters, and industrial UPS systems requiring stable component supply with consistent parametric performance across production lots.

Supply support for SF45G 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 power electronics markets since 1979.

The SF45G belongs to TSC's SF4xG super fast rectifier family, engineered specifically for high-efficiency, high-reliability switching power conversion in industrial, telecom, and automotive auxiliary systems.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) for the SF45G?

The SF45G has a V_RRM rating of 400 V, confirmed in the Absolute Maximum Ratings table for the SF45G row. This value is fixed per part number and distinct from SF44G (200V) and SF46G (500V). The SF45G must not be subjected to reverse voltages exceeding 400 V in continuous operation.

What is the forward voltage (V_F) of the SF45G at 4A and 25°C?

The SF45G exhibits a maximum forward voltage of 1.3 V at 4 A and 25°C, as specified in the Electrical Specifications table under "SF45G / SF46G" grouping. This value is measured under pulsed conditions (PW = 0.3 ms) and represents worst-case conduction loss at nominal current.

Does the SF45G have AEC-Q101 qualification?

The base SF45G is not AEC-Q101 qualified; however, the variant SF45GH (ordering code with "H" suffix) is explicitly qualified per AEC-Q101. The SF45G datasheet states "AEC-Q101 qualified available", and the Ordering Information table confirms SF45GH as the qualified version - SF45G itself is for industrial/commercial use only.

What is the reverse recovery time (t_rr) specification for the SF45G?

The SF45G has a maximum reverse recovery time of 35 ns, tested under IF = 0.5 A, IR = 1.0 A, and I_rr = 0.25 A conditions. This value is shared with SF46G–SF48G and is documented in the Electrical Specifications table under "Reverse recovery time".

What package type does the SF45G use, and what are its key mechanical attributes?

The SF45G uses the DO-201AD package: axial-leaded, molded plastic case with cathode band polarity marking. Key attributes include UL 94V-0 flammability rating, pure tin-plated leads compliant with J-STD-002, and 1.10 g typical weight. Its outline matches JEDEC DO-201AD standard dimensions.

How does the SF45G's junction capacitance compare to lower-voltage variants in the SF4xG family?

The SF45G has a typical junction capacitance of 80 pF at 1 MHz and 4 V reverse bias, matching SF46G–SF48G. In contrast, SF41G–SF44G specify 100 pF. This 20% reduction supports cleaner high-dV/dt switching in 400V+ applications where capacitive coupling noise must be minimized.

SF45G 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):: 300 V

Current - Average Rectified (Io):: 4A

Voltage - Forward (Vf) (Max) @ If:: 1.3 V @ 4 A

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

Reverse Recovery Time (trr):: 35 ns

Current - Reverse Leakage @ Vr:: 5 µA @ 300 V

Capacitance @ Vr, F:: 80pF @ 4V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-201AD

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

SF45G FAQ

1.How can I place an order for SF45G through Aetrix?

Please submit a Request for Quotation (RFQ) for SF45G 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 SF45G reliable?

The price and inventory of SF45G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SF45G is usually 5 days.

3.What payment methods are accepted for SF45G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SF45G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SF45G?

SF45G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SF45G 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 SF45G?

For technical support, including SF45G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SF45G requirements.

6.How does Aetrix verify that SF45G is sourced from the original manufacturer or authorized distributors?

All SF45G 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 SF45G meets industry standards.

7.What is the process for return or replacement of SF45G?

All SF45G units undergo pre-shipment inspection (PSI). If there is an issue with SF45G, 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 SF45G part is unused and in its original packaging.

Return procedure for SF45G:

1.Submit a request within 90 days.

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

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