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Taiwan Semiconductor Corporation SF44G
- Part No.:
- SF44G
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-201AD, Axial
- Datasheet:
-
SF44G.pdf
- Description:
- DIODE GEN PURP 200V 4A DO201AD
- Quantity:
- Payment:
- Shipping:
Inventory:2,490
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Product details
Overview
SF44G from Taiwan Semiconductor is a 4A, 200V super fast rectifier diode in DO-201AD package, designed for high-efficiency switching power supplies. It delivers low forward voltage (1.0 V at 4A, 25°C), ultra-fast reverse recovery (≤35 ns), and high surge capability (125 A IFSM), enabling use in DC-DC converters and freewheeling paths where thermal efficiency and dynamic response are critical.
For engineers reviewing the SF44G datasheet, SF44G pinout, SF44G application, or SF44G equivalent, key selection factors include its 200V VRRM rating, 1.0 V VF at rated current, 35 ns trr, DO-201AD mechanical compatibility, and AEC-Q101 qualification availability in variant SF44GH.
Technical Context
The SF44G is a single-die, planar passivated silicon rectifier optimized for high-frequency switching operation. Its 35 ns reverse recovery time and 100 pF junction capacitance at 1 MHz/4 V support minimal switching loss in SMPS topologies operating up to several hundred kHz.
Thermally, it features a junction-to-ambient resistance of 25°C/W in standard DO-201AD mounting, with maximum junction temperature rated at +150°C and full derating down to -55°C storage. The cathode-band polarity marking and pure tin-plated leads comply with J-STD-002 solderability and JESD201 Class 2 whisker requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 200 V - Maximum repetitive reverse voltage the device blocks reliably in circuit |
| IF | 4 A - Continuous average forward current under specified thermal conditions |
| VF @ 4A, 25°C | 1.0 V - Forward conduction loss directly impacts power stage efficiency and thermal design |
| trr | ≤35 ns - Enables high-frequency operation with reduced switching losses and EMI |
| IFSM (8.3 ms) | 125 A - Withstands transient inrush currents during startup or fault events |
| RθJA | 25 °C/W - Thermal resistance determines heatsinking requirement for 4A continuous operation |
| CJ @ 1 MHz, 4 V | 100 pF - Low junction capacitance minimizes capacitive switching loss and noise coupling |
Pinout & Package
DO-201AD axial-leaded package with cathode indicated by a band on the body; leads are pure tin-plated and solderable per J-STD-002. Weight ≈1.10 g. Molding compound meets UL 94V-0.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Forward current entry point | Connected to lower-potential node (e.g., switch node in buck freewheel path) |
| Cathode (banded end) | Forward current exit / reverse blocking terminal | Connected to higher-potential rail; reverse voltage applied between cathode and anode |
Key Features
| Feature | Design Value |
|---|---|
| Super fast recovery (trr ≤35 ns) | Reduces turn-off loss and enables >200 kHz switching in DC-DC converters |
| Low VF (1.0 V @ 4A) | Lowers conduction loss by ~15% vs. standard fast rectifiers, easing thermal management |
| High IFSM (125 A) | Survives repeated cold-start surges without degradation in industrial power supplies |
| DO-201AD with JESD201 Class 2 whisker compliance | Ensures long-term reliability in automotive and industrial environments with thermal cycling |
| AEC-Q101 qualified option (SF44GH) | Validated for automotive under-hood applications requiring extended temperature and stress testing |
Applications
| DC-DC Converters | Switching Inverters |
|---|---|
Use Scenario: Secondary-side rectification in isolated flyback or forward converters delivering 12–48 V output. IC Role / Device Role / Timing Role: Freewheeling diode conducting during MOSFET off-time to maintain output current continuity. Use Value: 1.0 V VF and 35 ns trr minimize conduction + switching losses, improving overall converter efficiency by ≥1.2% at 250 kHz. | Use Scenario: Output stage anti-parallel diodes in H-bridge motor inverters for BLDC or servo drives. IC Role / Device Role / Timing Role: Bidirectional current path for inductive kickback energy return during PWM dead-time. Use Value: 125 A IFSM withstands motor stall surges; 100 pF CJ limits dv/dt-induced shoot-through risk. |
| Freewheeling Circuits | Industrial SMPS |
Use Scenario: Inductor current recirculation path in buck regulators powering FPGA or ASIC core rails. IC Role / Device Role / Timing Role: Unidirectional current valve clamping inductive voltage spikes when main switch opens. Use Value: 200 V VRRM provides 2× margin over 100 V bus designs; DO-201AD allows through-hole reworkability. | Use Scenario: Input rectification and PFC boost diode in 300–500 W industrial AC-DC power supplies. IC Role / Device Role / Timing Role: High-current, high-reliability rectifier handling continuous 4 A load with thermal cycling endurance. Use Value: 150°C TJ max and JESD201 Class 2 plating ensure >10-year field life in enclosed enclosures at 70°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar super fast rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH4L06 (STMicroelectronics) | Same 4A/600V rating but VF = 1.7 V @ 4A; trr = 30 ns; TO-220AC package | Higher VF increases conduction loss; larger TO-220 requires PCB area and heatsink | Prefer SF44G for space-constrained DO-201AD layouts needing <1.1 V VF |
| ES4D (Vishay) | 4A/200V, VF = 0.95 V @ 4A, trr = 35 ns, same DO-201AD package | Near-identical electrical specs; RoHS/halogen-free compliant but not AEC-Q101 qualified | Choose SF44G when AEC-Q101 validation or Taiwan Semiconductor supply chain alignment is required |
Compared with STTH4L06 and ES4D, the SF44G offers optimal balance of low VF (1.0 V), ultra-fast trr (≤35 ns), and DO-201AD form factor-making it preferred for compact, high-efficiency industrial and automotive-qualified power stages where thermal and layout constraints dominate.
Availability
SF44G is available at Aetrix Electronics and suitable for DC-DC converters, switching inverters, and freewheeling circuits requiring stable component supply, consistent parametric performance across production lots, and long-term manufacturability assurance.
Supply support for SF44G 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 automotive markets since 1979.
The SF44G belongs to TSC's SF4xG super fast rectifier family, engineered specifically for high-frequency, high-reliability power conversion systems demanding low loss, fast recovery, and robust thermal performance in harsh environments.
FAQ
What is the peak repetitive reverse voltage (VRRM) rating of the SF44G?
The SF44G has a VRRM rating of 200 V, meaning it can reliably block up to 200 V of reverse voltage in repetitive operation without breakdown. This value is confirmed in the Absolute Maximum Ratings table for the SF44G row and defines its suitability for 100–200 V DC bus applications with appropriate safety margin.
What is the forward voltage drop (VF) of the SF44G at 4 A and 25°C?
The SF44G exhibits a maximum forward voltage of 1.0 V at 4 A and 25°C junction temperature, as specified in the Electrical Specifications table. This low VF reduces conduction losses and improves thermal efficiency in high-current rectification paths.
Is the SF44G available in an AEC-Q101 qualified version?
Yes-the SF44GH variant is AEC-Q101 qualified and shares identical electrical and mechanical specifications with the SF44G, differing only in enhanced reliability testing for automotive under-hood applications. Both use the DO-201AD package and same marking code structure.
What package type does the SF44G use, and what are its key mechanical attributes?
The SF44G uses the DO-201AD axial-leaded package. Key attributes include UL 94V-0 flammability-rated molding compound, pure tin-plated leads compliant with J-STD-002, cathode band polarity marking, and a typical weight of 1.10 g. It meets JESD201 Class 2 whisker resistance.
How does the SF44G compare to the SF43G and SF45G in terms of voltage and forward voltage ratings?
The SF44G is rated for 200 V VRRM and 1.0 V VF at 4 A/25°C. The SF43G is 150 V/1.0 V, and the SF45G is 300 V/1.3 V. Thus, the SF44G provides the lowest VF within the 200–300 V range and serves as the optimal trade-off for 200 V bus systems prioritizing conduction efficiency.
SF44G 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):
- 200 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 @ 200 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
SF44G FAQ
1.How can I place an order for SF44G through Aetrix?
Please submit a Request for Quotation (RFQ) for SF44G 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 SF44G reliable?
The price and inventory of SF44G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SF44G is usually 5 days.
3.What payment methods are accepted for SF44G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SF44G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SF44G?
SF44G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SF44G 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 SF44G?
For technical support, including SF44G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SF44G requirements.
6.How does Aetrix verify that SF44G is sourced from the original manufacturer or authorized distributors?
All SF44G 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 SF44G meets industry standards.
7.What is the process for return or replacement of SF44G?
All SF44G units undergo pre-shipment inspection (PSI). If there is an issue with SF44G, 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 SF44G part is unused and in its original packaging.
Return procedure for SF44G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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