My Inquiry
My Account
Taiwan Semiconductor Corporation SFA806G
- Part No.:
- SFA806G
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- TO-220-2
- Datasheet:
-
SFA806G.pdf
- Description:
- DIODE GEN PURP 400V 8A TO220AC
- Quantity:
- Payment:
- Shipping:
Inventory:1,000
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SFA806G from Taiwan Semiconductor is an 8A, 400V super fast rectifier diode in TO-220AC package, designed for high-efficiency switching power supplies. It delivers 1.300V forward voltage at 8A/25°C, 35ns reverse recovery time, 125A surge capability, and operates up to 150°C junction temperature - deployed in DC-DC converters and freewheeling paths.
For engineers reviewing the SFA806G datasheet, SFA806G pinout, SFA806G application, or SFA806G equivalent, key selection criteria include VRRM = 400V, IF = 8A, trr = 35ns, VF = 1.300V, and thermal resistance RθJC = 4°C/W - all critical for high-frequency, high-reliability power conversion designs.
Technical Context
The SFA806G employs a single-die silicon PN junction optimized for super-fast recovery (trr = 35ns), enabling efficient operation in 50–500 kHz switching topologies. Its low Qrr and reduced stored charge minimize switching losses during turn-off transitions.
Thermally, it features a low RθJC of 4°C/W and a 150°C maximum junction temperature, supporting continuous 8A conduction with forced-air or heatsink-assisted cooling. The device is rated for 125A non-repetitive surge (8.3ms half-sine), suitable for transient load handling in industrial SMPS.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 400 V - Maximum repetitive reverse blocking voltage; defines safe operating range in 400V bus applications |
| IF | 8 A - Continuous average forward current; supports sustained power delivery without derating below 75°C case temp |
| trr | 35 ns - Reverse recovery time; enables stable operation in high-frequency converters up to ~500 kHz |
| VF | 1.300 V @ 8A, 25°C - Forward voltage drop; determines conduction loss (10.4W at full load) and thermal design margin |
| RθJC | 4 °C/W - Junction-to-case thermal resistance; allows calculation of heatsink requirements for target TJ |
| IFSM | 125 A - Peak non-repetitive surge current; withstands inrush and fault currents in motor drives and UPS systems |
| CJ | 60 pF @ 1MHz, 4V - Junction capacitance; impacts EMI generation and snubber sizing in hard-switched topologies |
Pinout & Package
Package: TO-220AC - 3-lead, single-ended, through-hole power package with isolated tab (cathode-connected tab), matte tin-plated leads, UL 94V-0 molding compound, and 0.56 N·m max mounting torque.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry | Connected to lower-potential side (e.g., switch node in buck freewheel path) |
| Cathode | Forward current exit / reverse blocking terminal | Internally bonded to metal tab; electrically connected to heatsink when mounted |
| Tab (Case) | Cathode terminal | Provides primary thermal path to heatsink; requires electrical isolation if cathode is not chassis-ground referenced |
Key Features
| Feature | Design Value |
|---|---|
| Super-fast recovery (35ns) | Reduces switching losses and EMI in high-frequency SMPS, enabling smaller magnetics and filters |
| Low VF (1.300V @ 8A) | Lowers conduction loss by ~15% vs. standard FRDs with comparable VRRM, improving system efficiency |
| High IFSM (125A) | Supports robust operation during startup surges and short-circuit events without bond-wire failure |
| AEC-Q101 qualified option (SFA806GH) | Validated for automotive under-hood environments including temperature cycling, HTRB, and mechanical shock |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and global environmental regulations for industrial and consumer end equipment |
Applications
| DC-DC Converters | Switching Inverters |
|---|---|
Use Scenario: Secondary-side rectification in isolated flyback and forward converters delivering 24–48V outputs. IC Role / Device Role / Timing Role: Super-fast rectifier providing low-loss, high-efficiency output current path with minimal reverse recovery tail. Use Value: Enables >92% efficiency at 500kHz switching while maintaining thermal stability under 8A continuous load. | Use Scenario: Freewheeling diode in three-phase IGBT-based motor inverters for HVAC and industrial drives. IC Role / Device Role / Timing Role: Clamp inductive kickback energy during IGBT turn-off, requiring fast trr to prevent cross-conduction. Use Value: 35ns trr prevents shoot-through risk and reduces snubber losses compared to standard FRDs. |
| Uninterruptible Power Supplies | Industrial Switch-Mode Power Supplies |
Use Scenario: Output rectification in double-conversion online UPS systems with 400V DC bus. IC Role / Device Role / Timing Role: High-reliability rectifier handling both normal and overload conditions up to 125A surge. Use Value: 125A IFSM and 150°C TJMAX ensure fail-safe operation during battery backup transitions. | Use Scenario: Primary-side clamp and secondary-side rectification in telecom rectifiers and server PSUs. IC Role / Device Role / Timing Role: Discrete power diode replacing slower alternatives to improve power density and thermal headroom. Use Value: 4°C/W RθJC allows direct heatsink mounting with <10°C rise at 8A, simplifying thermal management. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar super fast rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH8R04DJF | VRRM = 400V, IF = 8A, trr = 30ns, VF = 1.25V @ 8A - slightly faster and lower VF, but TO-220FP package (shorter leads) | Same 400V SMPS use cases; shorter lead form factor may require PCB rework for through-hole clearance | Select when prioritizing lowest possible conduction + switching loss and board space permits TO-220FP footprint |
| ON Semi MUR840E | VRRM = 400V, IF = 8A, trr = 35ns, VF = 1.35V @ 8A - identical trr, but higher VF and no AEC-Q101 variant | Compatible in industrial SMPS; lacks automotive qualification path for automotive-grade programs | Select when cost sensitivity outweighs AEC-Q101 requirement and 50mV higher VF is acceptable |
Compared with STTH8R04DJF and MUR840E, the SFA806G offers balanced performance with AEC-Q101 availability (as SFA806GH), consistent 35ns trr, and industry-standard TO-220AC mechanical compatibility - making it optimal for automotive and industrial designs requiring qualification traceability and proven thermal mounting.
Availability
SFA806G is available at Aetrix Electronics and suitable for DC-DC converters, switching inverters, and uninterruptible power supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant discrete power solutions.
Supply support for SFA806G 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 discrete manufacturer headquartered in Hsinchu, Taiwan, serving industrial, computing, and automotive markets since 1979.
The SFA806G belongs to TSC's SFA80xG super fast rectifier family, engineered specifically for high-frequency, high-reliability power conversion where low VF, fast trr, and rugged surge capability are essential.
FAQ
What is the maximum junction temperature rating for the SFA806G?
The SFA806G has a maximum junction temperature (TJ) rating of +150°C, verified per absolute maximum ratings in the official datasheet. This allows continuous operation at full 8A current with appropriate heatsinking and case temperature control. Derating begins above 75°C case temperature, and thermal design must ensure the SFA806G junction stays within this limit under worst-case ambient and load conditions.
Is the SFA806G pin-compatible with other devices in the SFA80xG series?
Yes, all SFA80xG devices - including SFA806G - share identical TO-220AC package, pinout, and thermal/mechanical dimensions. Only electrical parameters differ: VRRM (400V for SFA806G), VF, and CJ scale across the series. This enables direct substitution during design-in or BOM optimization without layout changes, provided voltage and loss requirements align.
Does the SFA806G have automotive qualification?
The base SFA806G is not AEC-Q101 qualified, but the SFA806GH variant is fully AEC-Q101 qualified per version K2103 documentation. The "H" suffix denotes qualification for automotive applications including temperature cycling, HTRB, and mechanical shock testing. Customers requiring automotive compliance must specify SFA806GH, not SFA806G.
What is the reverse recovery time (trr) of the SFA806G and how is it measured?
The SFA806G has a typical reverse recovery time (trr) of 35ns, measured under conditions of IF = 0.5A, IR = 1.0A, and Irr = 0.25A per the official datasheet. This value reflects the time required for minority carriers to clear after forward conduction, directly impacting switching loss and EMI in high-frequency circuits using the SFA806G.
How does the SFA806G compare to standard fast recovery diodes in terms of efficiency?
The SFA806G improves efficiency over standard fast recovery diodes via its 35ns trr and 1.300V VF at 8A - reducing both switching and conduction losses. In a 200kHz flyback converter, this translates to ~0.5–0.8% higher system efficiency versus FRDs with trr > 75ns and VF > 1.5V. The SFA806G achieves this without sacrificing surge robustness or thermal performance.
SFA806G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- TO-220-2
- Packaging:
- Tube
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 400 V
- Current - Average Rectified (Io):
- 8A
- Voltage - Forward (Vf) (Max) @ If:
- 1.3 V @ 8 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 35 ns
- Current - Reverse Leakage @ Vr:
- 10 µA @ 400 V
- Capacitance @ Vr, F:
- 60pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220AC
- Operating Temperature - Junction:
- -55°C ~ 150°C
SFA806G FAQ
1.How can I place an order for SFA806G through Aetrix?
Please submit a Request for Quotation (RFQ) for SFA806G 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 SFA806G reliable?
The price and inventory of SFA806G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SFA806G is usually 5 days.
3.What payment methods are accepted for SFA806G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SFA806G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SFA806G?
SFA806G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SFA806G 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 SFA806G?
For technical support, including SFA806G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SFA806G requirements.
6.How does Aetrix verify that SFA806G is sourced from the original manufacturer or authorized distributors?
All SFA806G 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 SFA806G meets industry standards.
7.What is the process for return or replacement of SFA806G?
All SFA806G units undergo pre-shipment inspection (PSI). If there is an issue with SFA806G, 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 SFA806G part is unused and in its original packaging.
Return procedure for SFA806G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SFA806G Tags
-
1N4448X-TP
Micro Commercial Co
-
1N4148WX-TP
Micro Commercial Co
-
1N4148TR
onsemi
-
MMSD4148T1G
onsemi
-
MMBD914LT3G
onsemi
-
BAS16HT1G
onsemi
-
1N914BWT
onsemi
-
BAS21LT1G
onsemi
-
LL4148
onsemi
-
BAS16LT1G
onsemi
-
MMSD914T1G
onsemi
-
BAV21W-7-F
Diodes Incorporated
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
