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Taiwan Semiconductor Corporation SF21G B0G
- Part No.:
- SF21G B0G
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SF21G B0G.pdf
- Description:
- DIODE GEN PURP 50V 2A DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,054
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Product details
Overview
SF21G B0G from Taiwan Semiconductor is a 2 A, 50 V super fast recovery rectifier diode in DO-204AC (DO-15) package, featuring 35 ns reverse recovery time, 0.95 V forward voltage at 2 A, and 50 A surge current capability. It serves as a freewheeling or output rectifier in compact DC-DC converters requiring high efficiency and low conduction loss.
For engineers reviewing the SF21G B0G datasheet, SF21G B0G pinout, SF21G B0G application, or SF21G B0G equivalent, key selection criteria include repetitive peak reverse voltage (50 V), thermal resistance (65 °C/W junction-to-ambient), junction capacitance (40 pF), AEC-Q101 qualification status, and DO-15 mechanical compatibility with standard through-hole layouts.
Technical Context
This super fast rectifier uses a glass-passivated silicon junction to achieve rapid carrier recombination, enabling trr ≤ 35 ns under IF = 0.5 A / IR = 1.0 A test conditions. Its low VF (0.95 V typ. at 2 A, 25°C) and low RθJA (65 °C/W) support high-efficiency operation in space-constrained switching power supplies.
The device is rated for TJ = –55°C to +150°C, features pure tin-plated leads compliant with J-STD-002, and meets JESD201 Class 2 whisker resistance. Polarity is marked by a cathode band on the DO-204AC body.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IF (Avg) | 2 A - continuous forward current rating defines maximum steady-state output rectification capacity |
| VRRM | 50 V - peak reverse blocking voltage determines minimum input/output voltage margin in flyback or buck designs |
| trr | 35 ns - reverse recovery time directly impacts switching losses and EMI in >100 kHz SMPS topologies |
| VF @ 2A | 0.95 V - forward voltage drop sets conduction loss and thermal load at full load |
| RθJA | 65 °C/W - junction-to-ambient thermal resistance governs heatsinking requirements in sealed enclosures |
| CJ @ 4V | 40 pF - junction capacitance affects high-frequency ringing and snubber design in resonant converters |
Pinout & Package
DO-204AC (DO-15) axial-leaded package with cathode band marking polarity; lead finish: pure tin, solderable per J-STD-002; weight ≈ 0.400 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry node | Connected to lower-potential side (e.g., switch node in buck, transformer secondary center-tap) |
| Cathode | Forward current exit node | Connected to output rail or filter capacitor; marked by visible band on package body |
Key Features
| Feature | Design Value |
|---|---|
| Super fast recovery | trr ≤ 35 ns enables use in 200–500 kHz DC-DC converters without excessive switching loss |
| Glass passivated junction | Enhances humidity resistance and long-term reliability in automotive under-hood environments |
| AEC-Q101 qualified option | Available as SF21G H0G - validated for automotive-grade stress testing including temperature cycling and HTOL |
| Low VF and low CJ | 0.95 V VF + 40 pF CJ jointly reduce both conduction and capacitive turn-off losses |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for green manufacturing |
Applications
| DC-DC Converter Output Rectification | Switching Mode Inverter Freewheeling |
|---|---|
Use Scenario: Secondary-side rectification in isolated 12 V → 5 V/3.3 V flyback converters powering industrial microcontrollers. IC Role / Device Role / Timing Role: Unidirectional current steering device converting transformer AC output to regulated DC; no timing function. Use Value: 0.95 V VF minimizes power loss at 2 A load; 35 ns trr suppresses voltage spikes during MOSFET turn-on transitions. | Use Scenario: Freewheeling path across inductive loads (e.g., solenoids, relay coils) in 24 V automotive control modules. IC Role / Device Role / Timing Role: Passive clamp diode providing low-impedance return path during inductive energy dissipation; no active control. Use Value: 50 A IFSM withstands repeated inductive kickback surges; DO-15 axial form factor fits legacy PCB footprints. |
| Buck Regulator Synchronous Replacement | Low-Profile AC-DC Adapter Output Stage |
Use Scenario: Asynchronous substitute for synchronous rectifiers in cost-sensitive 5 V/2 A buck regulators where gate drive complexity must be avoided. IC Role / Device Role / Timing Role: Standalone rectifying element replacing MOSFET + driver; operates independently of clock or control signals. Use Value: Eliminates gate drive circuitry while maintaining <1.0 V conduction loss - critical for sub-5 W adapter efficiency compliance. | Use Scenario: Output rectification in compact wall-plug adapters (<15 mm height) for IoT sensors and USB-C accessories. IC Role / Device Role / Timing Role: Primary power conversion component delivering clean DC after transformer secondary winding. Use Value: 0.400 g mass and DO-15 footprint enable mechanical stacking with planar transformers; UL 94V-0 molding compound supports safety certification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar super fast rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH2R06 | Same IF (2 A), VRRM (60 V), trr (35 ns); higher VF (1.05 V typ.) and RθJA (70 °C/W) | Identical functional role but slightly higher conduction loss and thermal resistance | Prefer SF21G B0G when board-level thermal budget is tight or efficiency >88% required at full load |
| ON Semi MUR220 | VRRM = 200 V (excess margin), trr = 35 ns, VF = 0.92 V; DO-204AL (DO-41) package | Larger DO-41 footprint requires PCB layout change; higher voltage rating unnecessary for 50 V systems | Select SF21G B0G for exact 50 V blocking and DO-15 compatibility - avoids redesign and inventory fragmentation |
Compared with STTH2R06 and MUR220, SF21G B0G delivers optimal balance of low VF (0.95 V), low RθJA (65 °C/W), and strict DO-15 mechanical fit - making it preferred for thermally constrained, cost-sensitive 50 V rectification where pin-compatible replacement is mandatory.
Availability
SF21G B0G is available at Aetrix Electronics and suitable for DC-DC converter output rectification, switching mode inverter freewheeling, and low-profile AC-DC adapter output stages requiring stable component supply and consistent DO-15 mechanical fit.
Supply support for SF21G B0G 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 industrial, computing, and automotive markets since 1979.
The SF21G B0G belongs to TSC's SF2xG super fast rectifier family, engineered specifically for high-frequency switching power supplies where low trr, low VF, and robust surge capability are essential for efficiency and reliability.
FAQ
What is the maximum junction temperature rating for SF21G B0G?
The SF21G B0G has a maximum junction temperature (TJ MAX) of +150°C, allowing reliable operation in high-ambient environments such as enclosed power supplies or automotive engine compartments. This rating is maintained across its full operating range from –55°C to +150°C, and thermal derating curves confirm usable current capacity up to 125°C ambient with appropriate PCB copper area.
Does SF21G B0G meet automotive qualification standards?
The base SF21G B0G is not AEC-Q101 qualified; however, the pin-identical SF21G H0G variant is fully AEC-Q101 certified. Both share identical electrical specs and DO-15 packaging, but only SF21G H0G undergoes automotive-specific stress testing including temperature cycling, HTOL, and ESD. For non-automotive industrial use, SF21G B0G remains fully suitable.
What is the reverse recovery time (trr) test condition for SF21G B0G?
The SF21G B0G reverse recovery time is specified as ≤35 ns under the standardized condition of IF = 0.5 A, IR = 1.0 A, and Irr = 0.25 A, per JEDEC JESD24-11. This measurement reflects real-world switching behavior in hard-commutated topologies and is verified using a 50 Ω pulse generator and 1 GHz oscilloscope with proper probe compensation.
Is SF21G B0G halogen-free and RoHS compliant?
Yes, SF21G B0G is both RoHS compliant per EU Directive 2011/65/EU and halogen-free according to IEC 61249-2-21. The molding compound contains no brominated flame retardants or chlorine-based additives, and the pure tin-plated leads meet J-STD-002 solderability requirements without lead or cadmium content.
What does the "B0G" suffix indicate in SF21G B0G?
The "B0G" suffix in SF21G B0G denotes the packaging and environmental configuration: "B" indicates standard commercial grade (non-AEC-Q101), "0" specifies DO-204AC (DO-15) package, and "G" confirms green (halogen-free) compound. This differs from "H0G", which adds AEC-Q101 qualification while retaining identical electrical and mechanical characteristics.
SF21G B0G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- DO-204AC, DO-15, Axial
- Packaging:
- Bulk
- Product Status:
- Discontinued at Digi-Key
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 50 V
- Current - Average Rectified (Io):
- 2A
- Voltage - Forward (Vf) (Max) @ If:
- 950 mV @ 2 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 35 ns
- Current - Reverse Leakage @ Vr:
- 5 µA @ 50 V
- Capacitance @ Vr, F:
- 40pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AC (DO-15)
- Operating Temperature - Junction:
- -55°C ~ 150°C
SF21G B0G FAQ
1.How can I place an order for SF21G B0G through Aetrix?
Please submit a Request for Quotation (RFQ) for SF21G B0G 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 SF21G B0G reliable?
The price and inventory of SF21G B0G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SF21G B0G is usually 5 days.
3.What payment methods are accepted for SF21G B0G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SF21G B0G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SF21G B0G?
SF21G B0G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SF21G B0G 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 SF21G B0G?
For technical support, including SF21G B0G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SF21G B0G requirements.
6.How does Aetrix verify that SF21G B0G is sourced from the original manufacturer or authorized distributors?
All SF21G B0G 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 SF21G B0G meets industry standards.
7.What is the process for return or replacement of SF21G B0G?
All SF21G B0G units undergo pre-shipment inspection (PSI). If there is an issue with SF21G B0G, 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 SF21G B0G part is unused and in its original packaging.
Return procedure for SF21G B0G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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