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

Taiwan Semiconductor Corporation SF18G

Name: SF18G
Brand: Taiwan Semiconductor Corporation
SKU: SF18G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SF18G

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-204AL, DO-41, Axial

Datasheet:: SF18G.pdf

Description:: DIODE GEN PURP 600V 1A DO204AL

Quantity:: RFQ Add To RFQ list

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Inventory:4,720

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Product details

Overview

SF18G from Taiwan Semiconductor is a 600V, 1A super fast recovery rectifier diode in DO-204AL (DO-41) package, featuring 1.70V max forward voltage at 1A and 35ns reverse recovery time, used in high-frequency switching mode power supplies and freewheeling paths.

For engineers reviewing the SF18G datasheet, SF18G pinout, SF18G application, or SF18G equivalent, key selection criteria include V_RRM = 600V, I_F = 1A, t_rr = 35ns, V_F ≤ 1.70V @ 1A, and DO-41 mechanical compatibility for board-level thermal and layout validation.

Technical Context

The SF18G employs a single-die silicon PN junction optimized for high-voltage super fast recovery, with junction-to-lead thermal resistance of 20°C/W enabling sustained 1A conduction under moderate heatsinking. Its 600V V_RRM and 30A I_FSM support robust surge handling in DC-DC converters.

Designed for operation up to +150°C junction temperature, the SF18G maintains low leakage (≤100µA @ 125°C) and stable 10pF junction capacitance at 1MHz/4V - critical for minimizing switching losses and EMI in 100kHz–500kHz SMPS topologies.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	600 V - maximum repetitive reverse voltage before breakdown; defines safe operating ceiling in high-voltage output stages
I_F	1 A - continuous forward current rating; determines minimum trace width and thermal pad area in PCB layout
t_rr	35 ns - reverse recovery time; enables efficient operation in >200kHz switching converters with minimal tail current loss
V_F	≤1.70 V @ 1A, 25°C - forward voltage drop; directly impacts conduction loss and thermal rise in freewheeling diodes
R_θJL	20 °C/W - junction-to-lead thermal resistance; supports direct lead soldering to copper pour for passive cooling
C_J	10 pF @ 1MHz, 4V - junction capacitance; limits high-frequency displacement current and ringing in snubberless designs

Pinout & Package

DO-204AL (DO-41) axial-leaded package with cathode band marking; leads are pure tin plated, solderable per J-STD-002, UL 94V-0 molded compound, and JESD 201 Class 2 whisker compliant.

Pin/Terminal	Circuit Role	Design Meaning
Anode (unbanded end)	Forward current entry	Connected to switch node or inductor output in buck/flyback freewheeling path
Cathode (banded end)	Forward current exit / reverse blocking terminal	Connected to output rail or ground return; withstands 600V reverse bias during switching transitions

Key Features

Feature	Design Value
Super fast recovery (t_rr ≤ 35ns)	Reduces switching loss and improves efficiency in high-frequency SMPS above 200kHz
Low forward voltage (V_F ≤ 1.70V @ 1A)	Lowers conduction loss by ~15% vs. standard fast rectifiers at same current, easing thermal design
600V peak reverse voltage (V_RRM)	Supports 400V DC bus applications with 1.5× safety margin for line transients and ringing
AEC-Q101 qualified option available (SF18GH)	Validated for automotive under-hood ambient conditions up to +125°C case temperature
DO-41 package with JESD 201 Class 2 whisker resistance	Ensures long-term reliability in high-humidity or high-temperature industrial environments

Applications

AC-DC Adapter Secondary Rectification	DC-DC Buck Converter Freewheeling Diode
Use Scenario: 600V-rated secondary-side rectification in universal-input offline adapters delivering 5–24V outputs. IC Role / Device Role / Timing Role: Unidirectional current steering device converting transformer AC output to regulated DC, conducting only during positive half-cycles. Use Value: 35ns t_rr minimizes reverse recovery charge loss during high-frequency flyback switching, improving adapter efficiency by ≥0.8% at full load.	Use Scenario: Freewheeling path in 12V→5V/3.3V synchronous-buck or non-synchronous buck converters operating at 300–500kHz. IC Role / Device Role / Timing Role: Provides low-loss current recirculation path when high-side MOSFET is off, sustaining inductor current continuity. Use Value: 1.70V V_F and 20°C/W R_θJL enable <1.7W conduction loss at 1A, reducing thermal stress on adjacent ICs and PCB copper.
Industrial Motor Drive Snubber Diode	Photovoltaic Inverter DC Link Clamp
Use Scenario: Snubber network clamping in 3-phase IGBT-based motor drives with 400–600V DC link voltage. IC Role / Device Role / Timing Role: Fast transient clamp absorbing inductive kickback energy during IGBT turn-off, limiting dv/dt stress. Use Value: 600V V_RRM and 30A I_FSM allow reliable clamping of 600V+ spikes without avalanche degradation over 10⁶ cycles.	Use Scenario: DC link voltage clamping in string-level PV inverters where panel open-circuit voltage reaches 600V. IC Role / Device Role / Timing Role: Reverse-biased protection diode preventing overvoltage damage to MPPT controller during rapid irradiance changes. Use Value: ≤100µA IR at 125°C ensures negligible leakage current under desert ambient conditions, preserving system efficiency.

AC-DC Adapter Secondary Rectification

DC-DC Buck Converter Freewheeling Diode

Use Scenario: 600V-rated secondary-side rectification in universal-input offline adapters delivering 5–24V outputs.

IC Role / Device Role / Timing Role: Unidirectional current steering device converting transformer AC output to regulated DC, conducting only during positive half-cycles.

Use Value: 35ns t_rr minimizes reverse recovery charge loss during high-frequency flyback switching, improving adapter efficiency by ≥0.8% at full load.

Use Scenario: Freewheeling path in 12V→5V/3.3V synchronous-buck or non-synchronous buck converters operating at 300–500kHz.

IC Role / Device Role / Timing Role: Provides low-loss current recirculation path when high-side MOSFET is off, sustaining inductor current continuity.

Use Value: 1.70V V_F and 20°C/W R_θJL enable <1.7W conduction loss at 1A, reducing thermal stress on adjacent ICs and PCB copper.

Industrial Motor Drive Snubber Diode

Photovoltaic Inverter DC Link Clamp

Use Scenario: Snubber network clamping in 3-phase IGBT-based motor drives with 400–600V DC link voltage.

IC Role / Device Role / Timing Role: Fast transient clamp absorbing inductive kickback energy during IGBT turn-off, limiting dv/dt stress.

Use Value: 600V V_RRM and 30A I_FSM allow reliable clamping of 600V+ spikes without avalanche degradation over 10⁶ cycles.

Use Scenario: DC link voltage clamping in string-level PV inverters where panel open-circuit voltage reaches 600V.

IC Role / Device Role / Timing Role: Reverse-biased protection diode preventing overvoltage damage to MPPT controller during rapid irradiance changes.

Use Value: ≤100µA IR at 125°C ensures negligible leakage current under desert ambient conditions, preserving system efficiency.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH1R06	V_RRM = 600V, t_rr = 30ns, V_F = 1.7V @ 1A, DO-41, but higher leakage (200µA @ 125°C)	Better t_rr but higher IR compromises high-temp PV clamp stability	Prefer SF18G where low high-temp leakage is critical; STTH1R06 suits lower-ambient DC-DC freewheeling
ON Semi MUR160	V_RRM = 600V, t_rr = 50ns, V_F = 1.7V @ 1A, DO-41, higher R_θJA (100°C/W)	Slower recovery increases switching loss in >300kHz designs; less thermally efficient	Select SF18G for high-frequency, thermally constrained layouts; MUR160 acceptable for <200kHz industrial SMPS

Compared with STTH1R06 and MUR160, the SF18G delivers superior high-temperature leakage performance and balanced t_rr/V_F trade-off - making it optimal for photovoltaic clamping and compact 300–500kHz buck converters requiring long-term reliability at elevated ambient temperatures.

Availability

SF18G is available at Aetrix Electronics and suitable for DC-DC converter design, photovoltaic inverter protection, and industrial motor drive snubbing requiring stable component supply and consistent DO-41 mechanical form factor.

Supply support for SF18G 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 industrial, computing, and consumer markets since 1979.

The SF18G belongs to TSC's SF-series super fast rectifier product line, engineered specifically for high-efficiency, high-reliability switching power conversion in space-constrained and thermally demanding applications.

FAQ

What is the maximum junction temperature rating for the SF18G?

The SF18G has a maximum junction temperature (T_J) rating of +150°C, verified across its full operating range. This allows the SF18G to sustain continuous 1A forward current in ambient temperatures up to +105°C when mounted on standard FR-4 with 1-inch² copper pour, leveraging its 20°C/W R_θJL for effective heat transfer through leads.

Is the SF18G RoHS and halogen-free compliant?

Yes, the SF18G is RoHS compliant and halogen-free per IEC 61249-2-21. Its molding compound meets UL 94V-0 flammability rating, and its pure tin-plated leads satisfy J-STD-002 solderability requirements - all confirmed in Taiwan Semiconductor's H2104 datasheet revision for the SF18G.

Does the SF18G have AEC-Q101 qualification?

The base SF18G is not AEC-Q101 qualified, but the pin-compatible SF18GH variant is explicitly qualified per AEC-Q101 Rev D. The SF18GH shares identical electrical specs and DO-41 packaging, differing only in enhanced process controls and test screening for automotive under-hood use.

What is the reverse recovery time (t_rr) test condition for the SF18G?

The SF18G reverse recovery time is specified as ≤35ns under the condition: I_F = 0.5A, I_R = 1.0A, I_rr = 0.25A, per the H2104 datasheet. This standardized test reflects real-world behavior in non-synchronous buck and flyback converters where diode commutation occurs with defined forward and reverse current magnitudes.

How does the SF18G's junction capacitance affect high-frequency performance?

The SF18G exhibits 10pF typical junction capacitance at 1MHz and 4V reverse bias. This low C_J reduces displacement current during voltage transitions, minimizing EMI generation and gate-drive loading in high-speed switching circuits - a key advantage over older fast rectifiers with >20pF C_J in the same voltage class.

SF18G Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: DO-204AL, DO-41, Axial

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Standard

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

Current - Average Rectified (Io):: 1A

Voltage - Forward (Vf) (Max) @ If:: 1.7 V @ 1 A

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

Reverse Recovery Time (trr):: 35 ns

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

Capacitance @ Vr, F:: 10pF @ 4V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-204AL (DO-41)

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

SF18G FAQ

1.How can I place an order for SF18G through Aetrix?

Please submit a Request for Quotation (RFQ) for SF18G 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 SF18G reliable?

The price and inventory of SF18G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SF18G is usually 5 days.

3.What payment methods are accepted for SF18G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SF18G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SF18G?

SF18G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SF18G 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 SF18G?

For technical support, including SF18G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SF18G requirements.

6.How does Aetrix verify that SF18G is sourced from the original manufacturer or authorized distributors?

All SF18G 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 SF18G meets industry standards.

7.What is the process for return or replacement of SF18G?

All SF18G units undergo pre-shipment inspection (PSI). If there is an issue with SF18G, 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 SF18G part is unused and in its original packaging.

Return procedure for SF18G:

1.Submit a request within 90 days.

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

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