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

Taiwan Semiconductor Corporation SF66G

Name: SF66G
Brand: Taiwan Semiconductor Corporation
SKU: SF66G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SF66G

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-201AD, Axial

Datasheet:: SF66G.pdf

Description:: DIODE GEN PURP 400V 6A DO201AD

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SF66G from Taiwan Semiconductor is a 400 V, 6 A super fast recovery rectifier diode in DO-201AD package, featuring 35 ns reverse recovery time, 1.300 V forward voltage at 6 A and 25°C, and 150 A surge capability - used in high-efficiency DC-DC converters and switching inverters.

For engineers reviewing the SF66G datasheet, SF66G pinout, SF66G application, or SF66G equivalent, key selection criteria include repetitive peak reverse voltage (400 V), forward voltage drop (1.300 V @ 6 A), thermal resistance (5 °C/W junction-to-lead), reverse recovery time (35 ns), and AEC-Q101 qualification status.

Technical Context

The SF66G employs a single-die silicon PN junction optimized for fast switching in hard-commutated topologies. Its 35 ns trr and low Qrr support high-frequency operation up to 100 kHz in SMPS designs while maintaining low conduction loss.

Thermal performance is defined by R_θJL = 5 °C/W and R_θJA = 40 °C/W, enabling 6 A continuous forward current with appropriate PCB copper area. The device operates across -55°C to +150°C junction temperature range and meets JESD201 Class 2 whisker resistance.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	400 V - maximum non-repetitive reverse blocking voltage; defines safe operating limit in flyback/clamp circuits
I_F	6 A - continuous average forward current at T_A = 75°C with sufficient heatsinking
I_FSM	150 A - peak non-repetitive surge current (8.3 ms half-sine); supports inrush and fault transient handling
t_rr	35 ns - measured at I_F = 0.5 A, I_R = 1.0 A, I_rr = 0.25 A; enables efficient high-frequency rectification
V_F	1.300 V @ 6 A, 25°C - forward voltage drop directly impacts conduction loss and thermal design in power stages
C_J	50 pF @ 1 MHz, 4.0 V - junction capacitance affects switching node ringing and EMI in high-dV/dt applications
R_θJL	5 °C/W - junction-to-lead thermal resistance; determines temperature rise under lead-mounted conditions

Pinout & Package

DO-201AD axial-leaded package with cathode band marking; leads are pure tin plated, solderable per J-STD-002, and meet UL 94V-0 flammability rating. Weight ≈ 1.20 g.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to lower-potential side of load or switch node in freewheeling path
Cathode	Forward current exit / reverse blocking terminal	Marked by band; connects to higher-potential rail or output capacitor positive in buck/flyback outputs

Key Features

Feature	Design Value
Super fast recovery (t_rr = 35 ns)	Reduces switching losses and EMI in 50–100 kHz SMPS compared to standard rectifiers
Low forward voltage (1.300 V @ 6 A)	Lowers conduction loss by ~0.78 W vs. 1.45 V diode at same current, easing thermal management
High surge rating (150 A I_FSM)	Withstands repeated start-up surges and short-circuit transients without degradation
AEC-Q101 qualified option available	Validated for automotive under-hood applications including engine control and ADAS power supplies
Halogen-free & RoHS compliant	Meets IEC 61249-2-21 and environmental compliance requirements for industrial and consumer end equipment

Applications

Buck Converter Output Stage	Flyback Secondary Rectification
Use Scenario: High-efficiency 12 V → 3.3 V/5 V DC-DC conversion in telecom power modules. IC Role / Device Role / Timing Role: Freewheeling rectifier conducting during low-side switch off-time; defines output ripple and efficiency. Use Value: 35 ns t_rr minimizes reverse recovery charge loss; 1.300 V V_F reduces steady-state conduction loss at 6 A load.	Use Scenario: Isolated 48 V input → 12 V output flyback supply for industrial PLC I/O modules. IC Role / Device Role / Timing Role: Secondary-side synchronous rectification replacement; blocks reflected primary voltage during switch-on phase. Use Value: 400 V V_RRM safely withstands reflected voltage spikes; DO-201AD package allows through-hole mounting on dense PCBs.
Inverter DC Bus Clamping	Motor Drive Freewheeling Path
Use Scenario: Snubberless IGBT clamping in 3-phase 400 V AC drives. IC Role / Device Role / Timing Role: Clamp diode absorbing inductive energy during IGBT turn-off; requires fast recovery and high dV/dt immunity. Use Value: 150 A I_FSM handles worst-case motor regeneration surges; 50 pF C_J limits capacitive coupling into gate drive paths.	Use Scenario: Brushless DC motor controller with discrete H-bridge and external freewheeling diodes. IC Role / Device Role / Timing Role: Provides low-loss current recirculation path during PWM dead-time and switch commutation. Use Value: 6 A I_F rating matches typical BLDC phase current; cathode-band polarity ensures correct orientation in compact layouts.

Buck Converter Output Stage

Flyback Secondary Rectification

Use Scenario: High-efficiency 12 V → 3.3 V/5 V DC-DC conversion in telecom power modules.

IC Role / Device Role / Timing Role: Freewheeling rectifier conducting during low-side switch off-time; defines output ripple and efficiency.

Use Value: 35 ns t_rr minimizes reverse recovery charge loss; 1.300 V V_F reduces steady-state conduction loss at 6 A load.

Use Scenario: Isolated 48 V input → 12 V output flyback supply for industrial PLC I/O modules.

IC Role / Device Role / Timing Role: Secondary-side synchronous rectification replacement; blocks reflected primary voltage during switch-on phase.

Use Value: 400 V V_RRM safely withstands reflected voltage spikes; DO-201AD package allows through-hole mounting on dense PCBs.

Inverter DC Bus Clamping

Motor Drive Freewheeling Path

Use Scenario: Snubberless IGBT clamping in 3-phase 400 V AC drives.

IC Role / Device Role / Timing Role: Clamp diode absorbing inductive energy during IGBT turn-off; requires fast recovery and high dV/dt immunity.

Use Value: 150 A I_FSM handles worst-case motor regeneration surges; 50 pF C_J limits capacitive coupling into gate drive paths.

Use Scenario: Brushless DC motor controller with discrete H-bridge and external freewheeling diodes.

IC Role / Device Role / Timing Role: Provides low-loss current recirculation path during PWM dead-time and switch commutation.

Use Value: 6 A I_F rating matches typical BLDC phase current; cathode-band polarity ensures correct orientation in compact layouts.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH6L06S	600 V V_RRM, 1.65 V V_F @ 6 A, 50 ns t_rr, TO-220AC package	Higher voltage margin but higher conduction loss and larger footprint	Select when >400 V blocking or higher surge robustness required; not drop-in due to package and thermal interface differences
ON Semi MUR640E	400 V V_RRM, 1.35 V V_F @ 6 A, 35 ns t_rr, DO-201AD package	Same voltage/current rating and package; slightly higher V_F and no AEC-Q101 variant	Direct physical replacement with identical mounting; verify layout compatibility for cathode band alignment and thermal relief

Compared with STTH6L06S and MUR640E, the SF66G offers the lowest forward voltage in its voltage class among DO-201AD super fast rectifiers, delivering superior conduction efficiency in space-constrained 6 A applications where thermal resistance and board area are critical.

Availability

SF66G 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 long-term industrial availability.

Supply support for SF66G 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 power semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving industrial, computing, and automotive markets since 1979.

The SF66G belongs to the SF6xG super fast rectifier family designed specifically for high-frequency, high-reliability power conversion - emphasizing low V_F, fast t_rr, and robust surge capability in standard axial packages.

FAQ

What is the maximum repetitive peak reverse voltage rating for SF66G?

The SF66G has a maximum repetitive peak reverse voltage (V_RRM) of 400 V, as confirmed in the Absolute Maximum Ratings table. This rating defines the highest reverse voltage the device can block repeatedly without breakdown under normal operating conditions and must be derated per ambient temperature per the forward current derating curve in the datasheet.

Is SF66G AEC-Q101 qualified?

The base SF66G part is not AEC-Q101 qualified; however, the AEC-Q101 variant is designated SF66GH (with 'H' suffix). The datasheet explicitly states "AEC-Q101 qualified available" for the SF61G–SF68G family, and ordering code SF66GH confirms qualification. Standard SF66G is intended for industrial and commercial applications.

What is the forward voltage of SF66G at 6 A and 125°C?

The datasheet specifies V_F = 1.300 V only at T_J = 25°C. At elevated junction temperatures, V_F decreases - typical behavior for silicon diodes. While no exact value is published for 125°C, extrapolation using the -2 mV/°C temperature coefficient yields ~1.10 V. For precise design, thermal simulation and characterization at operating temperature are recommended for SF66G.

Can SF66G replace SF65G in an existing design?

No - SF65G is rated for 300 V V_RRM, while SF66G is rated for 400 V. Substituting SF66G for SF65G is electrically safe (higher voltage rating), but may increase forward voltage slightly (1.300 V vs. 1.300 V - same spec bin) and alter thermal behavior due to different junction capacitance (50 pF vs. 50 pF - identical). Verify layout clearance and snubber tuning if operating near 300 V limits.

What is the junction-to-ambient thermal resistance of SF66G?

The SF66G has a junction-to-ambient thermal resistance (R_θJA) of 40 °C/W, measured under standard JEDEC test conditions (single device on FR-4 board with 1 in² copper pad). This value assumes minimal PCB copper; actual R_θJA improves significantly with added thermal land and internal planes. For accurate thermal design, use R_θJL = 5 °C/W with proper lead heatsinking in SF66G applications.

SF66G 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):: 400 V

Current - Average Rectified (Io):: 6A

Voltage - Forward (Vf) (Max) @ If:: 1.3 V @ 6 A

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

Reverse Recovery Time (trr):: 35 ns

Current - Reverse Leakage @ Vr:: 5 µA @ 400 V

Capacitance @ Vr, F:: 50pF @ 4V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-201AD

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

SF66G FAQ

1.How can I place an order for SF66G through Aetrix?

Please submit a Request for Quotation (RFQ) for SF66G 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 SF66G reliable?

The price and inventory of SF66G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SF66G is usually 5 days.

3.What payment methods are accepted for SF66G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SF66G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SF66G?

SF66G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SF66G 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 SF66G?

For technical support, including SF66G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SF66G requirements.

6.How does Aetrix verify that SF66G is sourced from the original manufacturer or authorized distributors?

All SF66G 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 SF66G meets industry standards.

7.What is the process for return or replacement of SF66G?

All SF66G units undergo pre-shipment inspection (PSI). If there is an issue with SF66G, 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 SF66G part is unused and in its original packaging.

Return procedure for SF66G:

1.Submit a request within 90 days.

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

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