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

Taiwan Semiconductor Corporation SF22G-T

Name: SF22G-T
Brand: Taiwan Semiconductor Corporation
SKU: SF22G-T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SF22G-T

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-204AC, DO-15, Axial

Datasheet:: SF22G-T.pdf

Description:: 35NS, 2A, 100V, SUPER FAST RECOV

Quantity:: RFQ Add To RFQ list

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Inventory:9,215

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Product details

Overview

SF22G-T from Taiwan Semiconductor is a 2 A, 100 V super fast recovery rectifier diode in DO-204AC (DO-15) package, featuring 35 ns reverse recovery time, 0.95 V forward voltage at 2 A, and 50 A surge current capability. It serves as a freewheeling or output rectifier in high-frequency switching power supplies.

For engineers reviewing the SF22G-T datasheet, SF22G-T pinout, SF22G-T application, or SF22G-T equivalent, key selection criteria include repetitive peak reverse voltage (100 V), thermal resistance (65 °C/W junction-to-ambient), low VF for efficiency, RoHS/halogen-free compliance, and DO-15 mechanical compatibility with standard through-hole layouts.

Technical Context

This super fast rectifier uses a glass passivated silicon junction to achieve rapid carrier recombination, enabling operation up to several hundred kHz in SMPS topologies. Its 35 ns trr and low 40 pF junction capacitance minimize switching losses and EMI generation during turn-off.

The device operates over –55 °C to +150 °C junction temperature range with 16 °C/W junction-to-case thermal resistance, supporting reliable conduction under sustained 2 A DC load and transient 50 A surge conditions per JESD201 Class 1A whisker-tested tin-plated leads.

Key Specifications

Parameter	Value and Actual Design Meaning
VRRM	100 V - Maximum repetitive reverse blocking voltage; defines safe operating limit in flyback/freewheeling paths
IF	2 A - Continuous forward current rating; determines minimum trace width and heatsinking in PCB layout
trr	35 ns - Reverse recovery time; critical for minimizing switching loss and ringing in >100 kHz converters
VF @ 2 A	0.95 V - Forward voltage drop at rated current; directly impacts conduction loss and thermal design
RθJA	65 °C/W - Junction-to-ambient thermal resistance; used to calculate temperature rise without heatsink
IFSM	50 A - Non-repetitive surge current; supports inrush tolerance in AC/DC front-end and PFC stages
CJ	40 pF @ 1 MHz, 4 V - Junction capacitance; affects high-frequency noise coupling and snubber sizing

Pinout & Package

DO-204AC (DO-15) package with axial leads: cathode indicated by band; lead finish is pure tin, solderable per J-STD-002; weight ≈ 0.400 g.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to lower-potential node (e.g., switch node in buck, transformer secondary in flyback)
Cathode	Forward current exit / reverse blocking terminal	Connected to output rail or positive bus; polarity band must align with PCB silkscreen

Key Features

Feature	Design Value
Glass passivated junction	Enhances moisture resistance and long-term reliability in humid or thermally cycled environments
Super fast recovery (35 ns)	Reduces switching loss and EMI vs. standard rectifiers, enabling higher-frequency converter designs
RoHS and halogen-free	Complies with IEC 61249-2-21; meets environmental requirements for industrial and consumer end equipment
JESD201 Class 1A whisker test	Validates tin-lead-free plating stability; eliminates risk of conductive filament growth under bias and temperature stress

Applications

DC–DC Converter Output Rectification	Switching Mode Inverter Freewheeling
Use Scenario: Secondary-side rectification in isolated 20–200 kHz flyback or forward converters delivering 5–24 V at ≤2 A. IC Role / Device Role / Timing Role: Unidirectional current valve converting transformer AC output to regulated DC; timing role defined by trr-driven switching node transitions. Use Value: 0.95 V VF minimizes conduction loss; 35 ns trr reduces dead-time-related losses and improves efficiency above 100 kHz.	Use Scenario: Freewheeling path across inductive loads (e.g., motor windings, solenoids) in half-bridge inverters. IC Role / Device Role / Timing Role: Clamp inductive kickback energy during switch off; timing role governed by trr to prevent cross-conduction in bridge legs. Use Value: 50 A IFSM withstands high-energy transients; 100 V VRRM covers typical 48–72 V bus systems with margin.
AC–DC Adapter Secondary Rectifier	Industrial Power Supply Snubber Diode
Use Scenario: Output rectification in compact wall adapters (≤30 W) using quasi-resonant or fixed-frequency flyback topology. IC Role / Device Role / Timing Role: High-efficiency rectifier replacing slower UF or standard PN devices; timing role tied to converter switching frequency and trr. Use Value: Low VF and 40 pF CJ reduce heat and high-frequency noise, easing EMI filter design and thermal management.	Use Scenario: RCD snubber clamp diode in high-voltage MOSFET gate drivers or auxiliary power supplies. IC Role / Device Role / Timing Role: Fast turn-on/turn-off element absorbing leakage inductance spikes; timing role defined by trr and CJ matching snubber RC time constant. Use Value: 35 ns trr ensures clean clamping before MOSFET re-conduction; 100 V rating supports 60–80 V clamp voltages.

DC–DC Converter Output Rectification

Switching Mode Inverter Freewheeling

Use Scenario: Secondary-side rectification in isolated 20–200 kHz flyback or forward converters delivering 5–24 V at ≤2 A.

IC Role / Device Role / Timing Role: Unidirectional current valve converting transformer AC output to regulated DC; timing role defined by trr-driven switching node transitions.

Use Value: 0.95 V VF minimizes conduction loss; 35 ns trr reduces dead-time-related losses and improves efficiency above 100 kHz.

Use Scenario: Freewheeling path across inductive loads (e.g., motor windings, solenoids) in half-bridge inverters.

IC Role / Device Role / Timing Role: Clamp inductive kickback energy during switch off; timing role governed by trr to prevent cross-conduction in bridge legs.

Use Value: 50 A IFSM withstands high-energy transients; 100 V VRRM covers typical 48–72 V bus systems with margin.

AC–DC Adapter Secondary Rectifier

Industrial Power Supply Snubber Diode

Use Scenario: Output rectification in compact wall adapters (≤30 W) using quasi-resonant or fixed-frequency flyback topology.

IC Role / Device Role / Timing Role: High-efficiency rectifier replacing slower UF or standard PN devices; timing role tied to converter switching frequency and trr.

Use Value: Low VF and 40 pF CJ reduce heat and high-frequency noise, easing EMI filter design and thermal management.

Use Scenario: RCD snubber clamp diode in high-voltage MOSFET gate drivers or auxiliary power supplies.

IC Role / Device Role / Timing Role: Fast turn-on/turn-off element absorbing leakage inductance spikes; timing role defined by trr and CJ matching snubber RC time constant.

Use Value: 35 ns trr ensures clean clamping before MOSFET re-conduction; 100 V rating supports 60–80 V clamp voltages.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH2R01	Same 2 A / 100 V rating; trr = 30 ns, VF = 0.92 V; TO-220AC package	Requires PCB mount change (through-hole DO-15 → surface-mount TO-220); higher thermal mass but better heatsinking	Select when board-level thermal management allows larger footprint and higher surge robustness is prioritized
ON Semi MUR210	2 A / 100 V; trr = 35 ns, VF = 0.97 V; same DO-204AC package; RoHS-compliant	No mechanical or layout change required; identical pinout and footprint; slightly higher VF increases conduction loss by ~2%	Drop-in replacement where existing DO-15 layout must be preserved and minor VF trade-off is acceptable

Compared with STTH2R01 and MUR210, the SF22G-T offers optimal balance of DO-15 compatibility, 0.95 V VF, and 35 ns trr-making it preferred for space-constrained, cost-sensitive 2 A SMPS outputs where thermal budget permits axial-leaded packaging.

Availability

SF22G-T is available at Aetrix Electronics and suitable for DC–DC converters, switching mode inverters, and freewheeling applications requiring stable component supply, consistent parametric performance, and full RoHS/halogen-free compliance.

Supply support for SF22G-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, serving global industrial, computing, and consumer markets since 1979.

The SF22G-T belongs to TSC's SFxG-T super fast rectifier family, engineered specifically for high-efficiency, high-frequency switching power conversion where low VF, fast trr, and robust surge capability are essential.

FAQ

What is the maximum junction temperature rating for the SF22G-T?

The SF22G-T has a maximum junction temperature (T_J) rating of +150 °C, with operational range from –55 °C to +150 °C. This allows reliable use in enclosed industrial power supplies where ambient temperatures exceed 85 °C, provided thermal design accounts for its 65 °C/W junction-to-ambient resistance. Derating curves in the SF22G-T datasheet confirm 2 A continuous current is sustainable up to 75 °C ambient with no heatsink.

Does the SF22G-T have a specified reverse recovery time, and how is it measured?

Yes, the SF22G-T specifies a typical reverse recovery time (t_rr) of 35 ns, measured under conditions of I_F = 0.5 A, I_R = 1.0 A, and I_rr = 0.25 A. This value is validated per JEDEC standards and reflects actual switching behavior in high-frequency converters. The SF22G-T's 35 ns t_rr enables efficient operation in 100–500 kHz SMPS designs where slower rectifiers would incur excessive loss.

Is the SF22G-T RoHS compliant and halogen-free?

Yes, the SF22G-T is fully RoHS compliant and halogen-free per IEC 61249-2-21. Its molding compound and pure tin-plated leads meet environmental requirements for consumer, industrial, and automotive-qualified end equipment. The "G" suffix in SF22G-T explicitly denotes green (halogen-free) compound, verified in TSC's C2105 revision documentation.

What is the marking code on the SF22G-T device body?

The SF22G-T is marked "SF22G" on the device body, followed by date code (YWW format) and factory code "F". This marking aligns with TSC's DO-204AC package standard and matches the ordering code SF22G-T. The cathode band provides unambiguous polarity identification during manual or automated assembly.

Can the SF22G-T replace the SF21G-T or SF23G-T in an existing design?

The SF22G-T can replace SF21G-T (50 V) or SF23G-T (150 V) only if the circuit's peak reverse voltage remains within 100 V - its rated V_RRM. While all share identical package, thermal, and surge specs, their voltage ratings differ. Substituting SF22G-T for SF23G-T risks failure under 150 V transients; using it instead of SF21G-T is electrically safe but may increase cost without benefit. Always verify V_RRM margin in the target application before substitution.

SF22G-T Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: DO-204AC, DO-15, Axial

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Standard

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

Current - Average Rectified (Io):: 2A

Voltage - Forward (Vf) (Max) @ If:: 950 mV @ 2 A

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

Reverse Recovery Time (trr):: 35 ns

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

Capacitance @ Vr, F:: 40pF @ 4V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-204AC (DO-15)

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

SF22G-T FAQ

1.How can I place an order for SF22G-T through Aetrix?

Please submit a Request for Quotation (RFQ) for SF22G-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 SF22G-T reliable?

The price and inventory of SF22G-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SF22G-T is usually 5 days.

3.What payment methods are accepted for SF22G-T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SF22G-T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SF22G-T?

SF22G-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SF22G-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 SF22G-T?

For technical support, including SF22G-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SF22G-T requirements.

6.How does Aetrix verify that SF22G-T is sourced from the original manufacturer or authorized distributors?

All SF22G-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 SF22G-T meets industry standards.

7.What is the process for return or replacement of SF22G-T?

All SF22G-T units undergo pre-shipment inspection (PSI). If there is an issue with SF22G-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 SF22G-T part is unused and in its original packaging.

Return procedure for SF22G-T:

1.Submit a request within 90 days.

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

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