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Taiwan Semiconductor Corporation SF11G-K
- Part No.:
- SF11G-K
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
SF11G-K.pdf
- Description:
- 35NS, 1A, 50V, SUPER FAST RECOVE
- Quantity:
- Payment:
- Shipping:
Inventory:6,960
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Product details
Overview
SF11G-K from Taiwan Semiconductor is a 1 A, 50 V super fast rectifier diode in DO-204AL (DO-41) package, featuring 35 ns reverse recovery time, 0.95 V forward voltage at 1 A and 25°C, and 30 A surge current capability. It serves as a freewheeling or output rectifier in DC-DC converters and switching-mode power supplies where low conduction loss and fast switching are required.
For engineers reviewing the SF11G-K datasheet, SF11G-K pinout, SF11G-K application, or SF11G-K equivalent, key selection criteria include its 50 V repetitive peak reverse voltage rating, 35 ns trr performance, thermal resistance (RθJL = 20°C/W), and RoHS/halogen-free compliance for industrial power conversion designs.
Technical Context
The SF11G-K employs a single-die silicon PN junction optimized for super-fast recovery, with a specified trr of ≤35 ns under IF = 0.5 A, IR = 1.0 A, and Irr = 0.25 A test conditions. Its VF of 0.95 V at 1 A/25°C and low CJ of 20 pF at 1 MHz/4 V support high-efficiency, high-frequency operation.
Thermally, it sustains continuous operation up to TJ = 150°C, with RθJL = 20°C/W enabling effective lead-based heat dissipation in through-hole PCB layouts. The DO-204AL package uses pure tin-plated leads compliant with J-STD-002 and JESD 201 Class 1A whisker testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IF (Average Forward Current) | 1 A - Continuous DC current handling capacity at TA = 75°C with adequate PCB copper area |
| VRRM (Repetitive Peak Reverse Voltage) | 50 V - Maximum allowable reverse-biased voltage before breakdown; defines safe operating margin in 24–48 V output stages |
| trr (Reverse Recovery Time) | 35 ns - Enables efficient operation in 100–500 kHz SMPS topologies by minimizing switching loss and EMI |
| VF (Forward Voltage) | 0.95 V @ 1 A, 25°C - Directly determines conduction loss (0.95 W per diode at full load); lower than standard FR/UF series |
| RθJL (Junction-to-Lead Thermal Resistance) | 20 °C/W - Quantifies thermal path efficiency from die to PCB copper; enables ~1.5 W dissipation with 30°C rise above ambient |
| CJ (Junction Capacitance) | 20 pF @ 1 MHz, VR = 4 V - Limits high-frequency displacement current and affects snubber design in flyback/LLC circuits |
Pinout & Package
DO-204AL (DO-41) axial-leaded package with cathode indicated by a band on the body. Leads are pure tin-plated, solderable per J-STD-002, and meet UL 94V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to lower-potential node (e.g., switch node in buck sync rectifier or transformer secondary center-tap) |
| Cathode | Current exit terminal during forward conduction; marked with band | Connected to higher-potential node (e.g., output rail or positive bus); polarity critical for correct freewheeling path |
Key Features
| Feature | Design Value |
|---|---|
| Super-fast recovery (trr ≤ 35 ns) | Reduces switching losses and improves efficiency in high-frequency DC-DC converters (>200 kHz) |
| Low VF (0.95 V @ 1 A) | Lowers conduction loss by ~15–20% vs. standard fast rectifiers, easing thermal management |
| RoHS & halogen-free compliance | Meets IEC 61249-2-21 and global environmental regulations for industrial and consumer end equipment |
| JESD 201 Class 1A whisker resistance | Ensures long-term reliability of tin-plated leads under thermal cycling and storage conditions |
Applications
| DC-DC Converter Output Rectification | Switching Mode Inverter Freewheeling |
|---|---|
Use Scenario: Used as secondary-side rectifier in isolated 24 V input / 5–12 V output flyback or forward converters. IC Role / Device Role / Timing Role: Unidirectional current valve converting high-frequency AC from transformer secondary into regulated DC output. Use Value: 0.95 V VF minimizes power loss at 1 A load; 35 ns trr prevents cross-conduction loss with synchronous MOSFETs. | Use Scenario: Placed across inductive loads (e.g., relay coils, motor windings) in 48 V industrial inverters. IC Role / Device Role / Timing Role: Provides low-loss return path for stored magnetic energy during switch-off transitions. Use Value: 30 A IFSM withstands transient inductive kickback; DO-41 mechanical robustness supports vibration-prone environments. |
| AC-DC Adapter Secondary Rectification | LED Driver Constant-Current Loop |
Use Scenario: Rectifies transformer output in compact 5–12 V, 1 A wall adapters with <15 mm height constraints. IC Role / Device Role / Timing Role: High-efficiency unidirectional conduction element in low-voltage, high-volume power supplies. Use Value: DO-204AL package fits tight board space; 50 V VRRM provides 2× safety margin over 24 V peak rectified voltage. | Use Scenario: Integrated in constant-current LED driver feedback loop to clamp reverse voltage across current-sense resistor. IC Role / Device Role / Timing Role: Precision reverse-blocking element ensuring stable current regulation during PWM dimming intervals. Use Value: 5 µA IR at 25°C prevents leakage-induced current drift; 20 pF CJ avoids signal coupling in analog sense paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar super fast rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH1R06U (STMicroelectronics) | Same 1 A / 600 V rating but higher VF (1.15 V); trr = 30 ns; TO-220AC package | Requires heatsink for >0.5 A continuous; unsuitable for space-constrained DO-41 footprints | Select only if higher VRRM margin or surface-mount compatibility is prioritized over VF and form factor |
| ES1D (ON Semiconductor) | 1 A / 200 V; VF = 0.92 V; trr = 35 ns; same DO-204AL package and marking polarity | Lower VRRM limits use to ≤100 V output circuits; identical footprint and solder process | Drop-in replacement only for 200 V-class designs; not rated for 50 V systems requiring tighter voltage tolerance |
Compared with STTH1R06U and ES1D, the SF11G-K uniquely balances 50 V VRRM, 0.95 V VF, 35 ns trr, and DO-204AL compatibility-making it optimal for cost-sensitive, space-limited 24–48 V industrial DC-DC outputs where thermal headroom is constrained.
Availability
SF11G-K is available at Aetrix Electronics and suitable for DC-DC converter output rectification, switching mode inverter freewheeling, and AC-DC adapter secondary rectification requiring stable component supply and consistent parametric performance across production lots.
Supply support for SF11G-K 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, specializing in power rectifiers, TVS diodes, and MOSFETs for industrial and computing markets.
The SF11G-K belongs to TSC's SFxG-K super fast rectifier family, engineered specifically for high-frequency, high-efficiency power conversion in compact through-hole designs where low VF and fast trr are critical.
FAQ
What is the maximum junction temperature rating for SF11G-K?
The SF11G-K has a maximum junction temperature (TJ) of +150°C, verified per absolute maximum ratings in the official Taiwan Semiconductor datasheet Version B2104. This allows continuous operation in ambient temperatures up to 75°C when mounted on standard FR-4 PCB with ≥1 cm² copper pour, leveraging its RθJL = 20°C/W thermal path. Derating curves confirm 1 A average current is sustainable at this limit.
Does SF11G-K support lead-free soldering processes?
Yes, SF11G-K features pure tin-plated leads qualified per J-STD-002 for lead-free soldering, including reflow profiles up to 260°C peak. Its DO-204AL molding compound meets UL 94V-0 and halogen-free requirements per IEC 61249-2-21, making SF11G-K compatible with RoHS-compliant manufacturing lines without post-process cleaning.
How does the reverse recovery time of SF11G-K compare to standard fast recovery diodes?
SF11G-K specifies trr ≤ 35 ns under IF = 0.5 A, IR = 1.0 A, and Irr = 0.25 A-significantly faster than standard FR-series diodes (typically 50–100 ns). This enables reduced switching loss and EMI in 200–500 kHz DC-DC converters. The SF11G-K achieves this via optimized carrier lifetime control, distinct from slower general-purpose rectifiers like 1N4007 (trr > 2 µs).
Is SF11G-K pin-compatible with other DO-204AL rectifiers such as 1N4933?
SF11G-K uses the standard DO-204AL (DO-41) package with axial leads and cathode band marking, matching mechanical dimensions and polarity orientation of 1N4933. However, electrical characteristics differ: 1N4933 is a 1 A, 200 V fast recovery diode with VF ≈ 1.2 V and trr ≈ 500 ns. Thus, SF11G-K is mechanically compatible but electrically superior for high-frequency designs.
What is the typical junction capacitance of SF11G-K and why does it matter?
SF11G-K exhibits a typical junction capacitance (CJ) of 20 pF at 1 MHz and 4 V reverse bias. This value directly impacts high-frequency behavior: lower CJ reduces displacement current during switching transitions, minimizing EMI generation and snubber losses in flyback and resonant converters. It also enables cleaner gate-drive waveforms when used in bootstrap or clamping circuits.
SF11G-K 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):
- 50 V
- Current - Average Rectified (Io):
- 1A
- Voltage - Forward (Vf) (Max) @ If:
- 950 mV @ 1 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 35 ns
- Current - Reverse Leakage @ Vr:
- 5 µA @ 50 V
- Capacitance @ Vr, F:
- 20pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AL (DO-41)
- Operating Temperature - Junction:
- -55°C ~ 150°C
SF11G-K FAQ
1.How can I place an order for SF11G-K through Aetrix?
Please submit a Request for Quotation (RFQ) for SF11G-K 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 SF11G-K reliable?
The price and inventory of SF11G-K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SF11G-K is usually 5 days.
3.What payment methods are accepted for SF11G-K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SF11G-K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SF11G-K?
SF11G-K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SF11G-K 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 SF11G-K?
For technical support, including SF11G-K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SF11G-K requirements.
6.How does Aetrix verify that SF11G-K is sourced from the original manufacturer or authorized distributors?
All SF11G-K 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 SF11G-K meets industry standards.
7.What is the process for return or replacement of SF11G-K?
All SF11G-K units undergo pre-shipment inspection (PSI). If there is an issue with SF11G-K, 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 SF11G-K part is unused and in its original packaging.
Return procedure for SF11G-K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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