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Taiwan Semiconductor Corporation SF11G R1G
- Part No.:
- SF11G R1G
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
SF11G R1G.pdf
- Description:
- DIODE GEN PURP 50V 1A DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:8,789
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Product details
Overview
SF11G R1G from Taiwan Semiconductor is a 1A, 50V super fast recovery rectifier diode in DO-204AL (DO-41) package, featuring 35ns reverse recovery time, 0.95V forward voltage at 1A/25°C, and 30A surge capability - used in DC-DC converter freewheeling paths and switching-mode power supplies.
For engineers reviewing the SF11G R1G datasheet, SF11G R1G pinout, SF11G R1G application, or SF11G R1G equivalent, key selection criteria include VRRM = 50V, IF = 1A, trr = 35ns, VF = 0.95V, and DO-41 mechanical compatibility with high-reliability industrial and automotive-grade designs.
Technical Context
The SF11G R1G is a single-die, planar junction silicon rectifier optimized for high-speed switching. Its 35ns reverse recovery time enables efficient operation in 100–500kHz SMPS topologies, while the 0.95V forward voltage minimizes conduction loss at 1A DC load current.
Thermally, it delivers RθJL = 20°C/W and RθJA = 80°C/W in DO-41 package, supporting continuous operation up to TJ = 150°C. The cathode-banded polarity and pure tin-plated leads comply with J-STD-002 solderability and JESD201 Class 2 whisker resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 50 V - maximum repetitive reverse blocking voltage; defines minimum input/output isolation in 24–48V DC-DC stages |
| IF | 1 A - average forward current rating; supports continuous conduction mode in low-power flyback and buck converters |
| trr | 35 ns - measured at IF = 0.5A, IR = 1.0A, Irr = 0.25A; enables clean turn-off in high-frequency switching nodes |
| VF | 0.95 V @ 1A, 25°C - low conduction loss improves efficiency in 12V–48V output rectification |
| IFSM | 30 A - non-repetitive surge rating (8.3ms half-sine); handles startup inrush and transient overloads |
| CJ | 20 pF @ 1MHz, 4V - low junction capacitance reduces switching noise and EMI in high-dv/dt environments |
Pinout & Package
DO-204AL (DO-41) axial-leaded package with cathode indicated by band; lead finish: pure tin per J-STD-002; weight ≈ 0.350g; UL 94V-0 molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry | Connected to switch node or transformer secondary in freewheeling path; requires thermal relief on PCB pour |
| Cathode | Forward current exit / reverse blocking terminal | Marked by band; ties to output rail or ground return; critical for correct polarity in synchronous rectifier feedback loops |
Key Features
| Feature | Design Value |
|---|---|
| Super fast recovery (trr = 35ns) | Reduces switching losses and ringing in 200–500kHz converters without snubber circuits |
| Low forward voltage (VF = 0.95V) | Lowers conduction loss by ~15% vs. standard FR107 at 1A, improving thermal margin in sealed enclosures |
| DO-41 mechanical standardization | Enables drop-in replacement across legacy designs using industry-standard footprint and reflow profiles |
| AEC-Q101 qualification option (SF11GH) | Validated for automotive under-hood temperature cycling (-40°C to +125°C ambient), vibration, and humidity stress |
Applications
| DC-DC Converter Freewheeling | Switch-Mode Power Supply Output Rectification |
|---|---|
Use Scenario: Freewheeling path in 48V-to-12V buck converter operating at 300kHz. IC Role / Device Role / Timing Role: Unidirectional current path during low-side MOSFET off-time; blocks reverse voltage during high-side switch conduction. Use Value: 35ns trr prevents reverse recovery tail current, reducing cross-conduction loss and output ripple. | Use Scenario: Secondary-side rectification in isolated flyback supply for industrial PLC I/O modules. IC Role / Device Role / Timing Role: Output rectifier conducting during transformer demagnetization phase; clamps leakage energy. Use Value: 0.95V VF maintains >89% efficiency at full 1A load, minimizing heatsink requirements. |
| Automotive LED Driver Protection | EMI-Sensitive Sensor Power Supply |
Use Scenario: Reverse polarity protection and flyback suppression in 24V LED headlamp driver. IC Role / Device Role / Timing Role: Polarity guard and inductive kick clamp; absorbs back-EMF from LED string inrush transients. Use Value: 30A IFSM withstands cold-crank surges; RoHS/halogen-free compliance meets automotive material directives. | Use Scenario: Input-stage rectification for ultra-low-noise LDO supply powering MEMS accelerometers. IC Role / Device Role / Timing Role: Low-capacitance (20pF) rectifier minimizing high-frequency coupling into analog signal chain. Use Value: 20pF CJ reduces RF injection from switching nodes, preserving SNR in sub-10µV RMS sensor outputs. |
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 | VRRM = 600V, trr = 35ns, VF = 1.15V @ 1A - higher blocking but higher VF | Designed for universal-input AC-DC front ends; over-specified for 50V DC-DC use | Select when system requires ≥400V reverse margin or shares BOM with higher-voltage variants |
| ON Semi MUR105 | VRRM = 50V, trr = 50ns, VF = 0.92V @ 1A - slightly lower VF but slower recovery | Optimized for cost-sensitive consumer adapters; not AEC-Q101 qualified | Prefer for non-automotive, low-EMI priority designs where 15ns slower trr is acceptable |
Compared with STTH1R06 and MUR105, the SF11G R1G uniquely balances 50V VRRM, 35ns trr, and 0.95V VF in a qualified DO-41 package - making it optimal for space-constrained, high-efficiency 24–48V industrial and automotive DC-DC freewheeling.
Availability
SF11G R1G is available at Aetrix Electronics and suitable for DC-DC converters, switching-mode inverters, and freewheeling applications requiring stable component supply, long-term lifecycle support, and automotive-grade reliability options.
Supply support for SF11G R1G 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 rectifiers, TVS, MOSFETs, and bipolar transistors since 1979.
The SF11G R1G belongs to TSC's SF-series super fast rectifier family, engineered for high-frequency switching power conversion in automotive, industrial, and telecom infrastructure where low trr, tight VF tolerance, and robust thermal performance are critical.
FAQ
What is the maximum junction temperature rating for SF11G R1G?
The SF11G R1G has a maximum junction temperature (TJ) of +150°C, verified per absolute maximum ratings table. This allows continuous operation in enclosed industrial enclosures up to +85°C ambient when mounted on standard FR-4 with 1-inch² copper pour. Derating begins above 25°C ambient per Fig.1 forward current derating curve in the SF11G R1G datasheet.
Is SF11G R1G pin-compatible with other DO-41 rectifiers like 1N4007?
Yes, SF11G R1G uses the standard DO-204AL (DO-41) axial package with identical lead spacing and diameter as 1N4007, enabling mechanical drop-in replacement. However, electrical behavior differs significantly: SF11G R1G offers 35ns trr and 0.95V VF, whereas 1N4007 has 30µs trr and 1.1V VF - making SF11G R1G unsuitable for line-frequency applications but ideal for high-frequency SMPS.
Does SF11G R1G meet automotive qualification standards?
The base SF11G R1G is not AEC-Q101 qualified; however, the variant SF11GH (marked with 'H') is fully AEC-Q101 certified for automotive under-hood use. Both share identical electrical specs and DO-41 packaging, differing only in test screening and traceability documentation - SF11G R1G remains suitable for industrial and commercial applications requiring high reliability.
What is the reverse leakage current specification for SF11G R1G at elevated temperature?
At TJ = 125°C and rated VR, SF11G R1G exhibits a maximum reverse leakage current (IR) of 100 µA, per electrical specifications table. This value is critical for maintaining efficiency in high-temperature DC-DC converters, as excessive leakage increases standby power loss and thermal runaway risk in parallel configurations.
How does the junction-to-lead thermal resistance of SF11G R1G impact PCB layout?
With RθJL = 20°C/W, SF11G R1G transfers heat efficiently from die to leads - enabling effective thermal management via wide copper traces connected directly to both anode and cathode pads. Layout best practice: use ≥2mm trace width per lead and avoid thermal isolation; this achieves <15°C rise at 1A continuous, eliminating need for external heatsinking in most 1W dissipation scenarios.
SF11G R1G 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 R1G FAQ
1.How can I place an order for SF11G R1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SF11G R1G 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 R1G reliable?
The price and inventory of SF11G R1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SF11G R1G is usually 5 days.
3.What payment methods are accepted for SF11G R1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SF11G R1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SF11G R1G?
SF11G R1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SF11G R1G 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 R1G?
For technical support, including SF11G R1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SF11G R1G requirements.
6.How does Aetrix verify that SF11G R1G is sourced from the original manufacturer or authorized distributors?
All SF11G R1G 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 R1G meets industry standards.
7.What is the process for return or replacement of SF11G R1G?
All SF11G R1G units undergo pre-shipment inspection (PSI). If there is an issue with SF11G R1G, 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 R1G part is unused and in its original packaging.
Return procedure for SF11G R1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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