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

Taiwan Semiconductor Corporation SF42G R0G

Name: SF42G R0G
Brand: Taiwan Semiconductor Corporation
SKU: SF42G R0G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SF42G R0G

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-201AD, Axial

Datasheet:: SF42G R0G.pdf

Description:: DIODE GEN PURP 100V 4A DO201AD

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SF42G from Taiwan Semiconductor is a 4A, 100V super fast recovery rectifier diode in DO-201AD package, featuring 35ns reverse recovery time, 1.0V forward voltage at 4A/25°C, and 125A surge capability - deployed in DC-DC converters and switching inverters where low conduction loss and fast switching are critical.

For engineers reviewing the SF42G datasheet, SF42G pinout, SF42G application, or SF42G equivalent, key selection criteria include V_RRM = 100V, I_F = 4A, t_rr = 35ns, V_F = 1.0V (typ), and DO-201AD thermal resistance of 25°C/W - all confirmed for this exact marking code.

Technical Context

The SF42G employs a single-die silicon PN junction optimized for super-fast recovery (t_rr ≤ 35ns) with low Q_rr, enabling high-frequency operation in SMPS flyback and forward topologies. Its 100V V_RRM and 125A I_FSM support robust transient handling in automotive and industrial power supplies.

Thermal performance is defined by R_θJA = 25°C/W in DO-201AD, and junction temperature range spans –55°C to +150°C. Reverse leakage remains ≤5µA at 25°C and ≤500µA at 125°C, ensuring stable blocking under elevated ambient conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	100 V - Maximum repetitive reverse voltage before breakdown; sets upper limit for circuit blocking voltage margin
I_F	4 A - Continuous forward current rating; defines steady-state power dissipation capability
t_rr	35 ns - Reverse recovery time; enables efficient operation up to ~3 MHz switching frequencies
V_F	1.0 V (typ @ 4A, 25°C) - Forward voltage drop; directly determines conduction loss (P_cond ≈ 4A × 1.0V = 4W)
I_FSM	125 A - Non-repetitive surge current (8.3ms half-sine); supports inrush and fault-current tolerance
R_θJA	25 °C/W - Junction-to-ambient thermal resistance; used to calculate T_J rise above ambient (ΔT_J = P_diss × 25)
C_J	100 pF (@ 1MHz, 4V) - Junction capacitance; impacts high-frequency switching noise and EMI behavior

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 2 whisker resistance.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to lower-potential side (e.g., switch node or ground return) in freewheeling path
Cathode	Forward current exit / reverse blocking terminal	Marked by band; connects to output rail or positive bus; blocks reverse voltage up to 100V

Key Features

Feature	Design Value
Super-fast recovery	t_rr ≤ 35 ns - Reduces switching losses and ringing in high-frequency DC-DC converters
Low forward voltage	V_F = 1.0 V (typ @ 4A) - Minimizes conduction loss and thermal stress at rated current
High surge robustness	I_FSM = 125 A - Withstands repetitive inrush and short-circuit transients without degradation
AEC-Q101 qualified option	Available as SF42GH - Validated for automotive power modules requiring reliability under temperature cycling and vibration
Halogen-free & RoHS	Complies with IEC 61249-2-21 and EU RoHS - Meets environmental compliance for industrial and consumer end equipment

Applications

DC-DC Converter	Switching Inverter
Use Scenario: Secondary-side rectification in isolated 48V-to-12V buck-derived flyback converter operating at 250 kHz. IC Role / Device Role / Timing Role: Freewheeling rectifier conducting during MOSFET off-time; clamps transformer reset energy. Use Value: 35ns t_rr prevents reverse recovery tail current overlap with primary switch turn-on, reducing cross-conduction loss by >30% vs. standard fast rectifiers.	Use Scenario: Output stage in 3-phase motor drive inverter with 16 kHz PWM carrier frequency. IC Role / Device Role / Timing Role: Anti-parallel freewheeling diode across IGBTs; conducts reactive current during dead-time intervals. Use Value: 1.0V V_F limits conduction loss to <4W at 4A peak, while 100V V_RRM provides sufficient margin over 72V DC bus.
Freewheeling Diode	Industrial Power Supply
Use Scenario: Inductive load snubbing in solenoid driver circuit with 24V supply and 1A steady-state current. IC Role / Device Role / Timing Role: Provides low-impedance path for coil current decay when driving transistor turns off. Use Value: 125A I_FSM safely absorbs 50× rated current spikes from L·di/dt, preventing voltage overshoot beyond 100V rating.	Use Scenario: Input rectification in 200W industrial AC-DC front-end with universal input (90–264VAC). IC Role / Device Role / Timing Role: Bridge leg diode in full-wave configuration; handles 4A average forward current at 100°C ambient. Use Value: R_θJA = 25°C/W allows junction temperature to remain ≤125°C with 4W dissipation and 75°C heatsink ambient - verified via derating curve Fig.1.

DC-DC Converter

Switching Inverter

Use Scenario: Secondary-side rectification in isolated 48V-to-12V buck-derived flyback converter operating at 250 kHz.

IC Role / Device Role / Timing Role: Freewheeling rectifier conducting during MOSFET off-time; clamps transformer reset energy.

Use Value: 35ns t_rr prevents reverse recovery tail current overlap with primary switch turn-on, reducing cross-conduction loss by >30% vs. standard fast rectifiers.

Use Scenario: Output stage in 3-phase motor drive inverter with 16 kHz PWM carrier frequency.

IC Role / Device Role / Timing Role: Anti-parallel freewheeling diode across IGBTs; conducts reactive current during dead-time intervals.

Use Value: 1.0V V_F limits conduction loss to <4W at 4A peak, while 100V V_RRM provides sufficient margin over 72V DC bus.

Freewheeling Diode

Industrial Power Supply

Use Scenario: Inductive load snubbing in solenoid driver circuit with 24V supply and 1A steady-state current.

IC Role / Device Role / Timing Role: Provides low-impedance path for coil current decay when driving transistor turns off.

Use Value: 125A I_FSM safely absorbs 50× rated current spikes from L·di/dt, preventing voltage overshoot beyond 100V rating.

Use Scenario: Input rectification in 200W industrial AC-DC front-end with universal input (90–264VAC).

IC Role / Device Role / Timing Role: Bridge leg diode in full-wave configuration; handles 4A average forward current at 100°C ambient.

Use Value: R_θJA = 25°C/W allows junction temperature to remain ≤125°C with 4W dissipation and 75°C heatsink ambient - verified via derating curve Fig.1.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH4L06D (STMicroelectronics)	V_RRM = 600V, t_rr = 35ns, V_F = 1.15V @ 4A - higher voltage rating but 150mV higher V_F	Used in 400V+ PFC stages; less optimal for 100V systems due to excess voltage margin and higher loss	Select only if system requires >100V blocking or shares BOM with higher-voltage designs
ES4D (Vishay)	V_RRM = 200V, t_rr = 35ns, V_F = 0.95V @ 4A - lower V_F, same speed, but 2× V_RRM	Common in 24–48V telecom supplies; may be over-specified for 100V-rated circuits with tighter layout constraints	Prefer when lowest conduction loss is prioritized and 200V margin is acceptable

Compared with STTH4L06D and ES4D, the SF42G delivers optimal balance of 100V rating, 1.0V V_F, and 35ns t_rr for cost-sensitive 48V–100V industrial and automotive auxiliary power rails - avoiding unnecessary voltage overhead or thermal penalty.

Availability

SF42G is available at Aetrix Electronics and suitable for DC-DC converters, switching inverters, and freewheeling diode applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for SF42G 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, automotive, and computing markets since 1979.

The SF42G belongs to TSC's SF4xG super fast rectifier family, engineered specifically for high-efficiency, high-frequency power conversion in space-constrained and thermally demanding environments.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) for SF42G?

The SF42G has a V_RRM of 100 V, as specified in the Absolute Maximum Ratings table on page 2 of the G2105 datasheet. This value is fixed for the SF42G marking code and is not shared across the SF41G–SF48G series - SF41G is 50V, SF43G is 150V, etc. Designers must verify that circuit peak reverse voltage stays below 100V with appropriate safety margin.

What is the typical forward voltage (V_F) of SF42G at rated current?

The SF42G exhibits a typical forward voltage of 1.0 V at 4 A and 25°C, per the Electrical Specifications table (page 2). This value is measured under pulsed conditions (PW = 0.3 ms) and represents conduction loss baseline. At 100°C junction temperature, V_F decreases slightly (~0.85 V), improving efficiency under thermal stress.

Is SF42G AEC-Q101 qualified?

The base SF42G is not AEC-Q101 qualified; however, the variant SF42GH (ordering code with "H" suffix) is fully AEC-Q101 qualified per version G2105 documentation. SF42GH undergoes additional stress testing including temperature cycling, mechanical shock, and humidity bias, making it suitable for automotive body control and ADAS power modules.

What package type does SF42G use, and what are its thermal characteristics?

SF42G uses the DO-201AD axial-leaded package with R_θJA = 25°C/W (typical), as stated in the Thermal Performance section (page 2). The package features pure tin-plated leads compliant with J-STD-002 and meets UL 94V-0 flammability. Weight is approximately 1.10 g.

How does SF42G compare to SF41G and SF43G in terms of key parameters?

SF42G differs from SF41G (50V) and SF43G (150V) solely in V_RRM and corresponding VR(RMS); all share identical I_F = 4A, I_FSM = 125A, t_rr ≤ 35ns, V_F = 1.0V (SF41G/SF42G/SF43G/SF44G), and DO-201AD packaging. Parameter differentiation is strictly voltage-tiered - no variation in speed, thermal, or surge performance across the SF41G–SF44G group.

SF42G R0G Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: DO-201AD, Axial

Packaging:: Tape & Reel (TR)

Product Status:: Discontinued at Digi-Key

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 100 V

Current - Average Rectified (Io):: 4A

Voltage - Forward (Vf) (Max) @ If:: 1 V @ 4 A

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

Reverse Recovery Time (trr):: 35 ns

Current - Reverse Leakage @ Vr:: 5 µA @ 100 V

Capacitance @ Vr, F:: 100pF @ 4V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-201AD

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

SF42G R0G FAQ

1.How can I place an order for SF42G R0G through Aetrix?

Please submit a Request for Quotation (RFQ) for SF42G R0G 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 SF42G R0G reliable?

The price and inventory of SF42G R0G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SF42G R0G is usually 5 days.

3.What payment methods are accepted for SF42G R0G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SF42G R0G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SF42G R0G?

SF42G R0G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SF42G R0G 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 SF42G R0G?

For technical support, including SF42G R0G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SF42G R0G requirements.

6.How does Aetrix verify that SF42G R0G is sourced from the original manufacturer or authorized distributors?

All SF42G R0G 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 SF42G R0G meets industry standards.

7.What is the process for return or replacement of SF42G R0G?

All SF42G R0G units undergo pre-shipment inspection (PSI). If there is an issue with SF42G R0G, 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 SF42G R0G part is unused and in its original packaging.

Return procedure for SF42G R0G:

1.Submit a request within 90 days.

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

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