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Taiwan Semiconductor Corporation SF37G R0G
- Part No.:
- SF37G R0G
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-201AD, Axial
- Datasheet:
-
SF37G R0G.pdf
- Description:
- DIODE GEN PURP 500V 3A DO201AD
- Quantity:
- Payment:
- Shipping:
Inventory:6,116
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Product details
Overview
SF37G R0G from Taiwan Semiconductor is a 500V, 3A super fast recovery rectifier diode in DO-201AD package, featuring 35ns reverse recovery time, 1.70V forward voltage at 3A/25°C, and 125A surge capability - deployed in high-efficiency DC-DC converters and freewheeling paths in automotive power supplies.
For engineers reviewing the SF37G R0G datasheet, SF37G R0G pinout, SF37G R0G application, or SF37G R0G equivalent, key selection criteria include VRRM = 500V, IF = 3A, trr = 35ns, thermal resistance RθJL = 10°C/W, and AEC-Q101 qualification status (R0G suffix indicates standard grade; H-suffix variants are AEC-Q101 qualified).
Technical Context
This single-die silicon rectifier operates with ultra-fast switching characteristics enabled by optimized carrier lifetime control, supporting high-frequency switching topologies up to several hundred kHz. Its 500V blocking rating and low Qrr minimize turn-off losses in flyback and forward converters.
The DO-201AD package provides robust thermal conduction via lead-frame design (RθJL = 10°C/W), while pure tin-plated leads ensure J-STD-002 solderability and JESD201 Class 2 whisker resistance - critical for industrial and automotive under-hood applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 500 V - maximum repetitive reverse voltage; defines safe operating range in 400–450V DC bus applications |
| IF | 3 A - average forward current; supports continuous conduction mode in 30–60W power stages |
| trr | 35 ns - reverse recovery time; enables efficient operation in 100–500 kHz SMPS designs |
| VF | 1.70 V @ 3A, 25°C - forward voltage drop; contributes ~5.1W conduction loss at full load |
| IFSM | 125 A - non-repetitive surge current (8.3ms sine); withstands startup/inrush transients |
| RθJL | 10 °C/W - junction-to-lead thermal resistance; enables direct PCB copper pour heat sinking |
| CJ | 60 pF @ 4V - junction capacitance; limits high-frequency displacement current and EMI generation |
Pinout & Package
DO-201AD axial-leaded package with cathode band marking; 2-terminal device (anode and cathode), lead-form compatible with through-hole and surface-mount (gull-wing bent) assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential node (e.g., switch node in boost/flyback); must handle full IF and IFSM |
| Cathode | Forward current exit / reverse blocking terminal | Marked by band; connects to output rail or ground return; sustains full VRRM during off-state |
Key Features
| Feature | Design Value |
|---|---|
| Super fast recovery (trr ≤ 35 ns) | Reduces switching losses and EMI in high-frequency converters vs. standard rectifiers (trr > 100 ns) |
| Low forward voltage (VF = 1.70 V) | Minimizes conduction loss at 3A, improving efficiency over higher-VF alternatives like 1N5408 (VF ≈ 1.2V @ 3A but trr > 2000 ns) |
| High surge rating (IFSM = 125 A) | Survives repeated cold-start surges in automotive DC-DC modules without degradation |
| DO-201AD mechanical robustness | UL 94V-0 molding compound and JESD201 Class 2 whisker resistance support long-term reliability in vibration-prone environments |
Applications
| Automotive DC-DC Converters | Industrial Switch-Mode Power Supplies |
|---|---|
Use Scenario: 12V-to-5V/3.3V buck-derived converter in engine control unit (ECU) with 42V load dump tolerance. IC Role / Device Role / Timing Role: Freewheeling diode in synchronous or quasi-resonant topology, conducting during low-side switch off-time. Use Value: 35ns trr prevents reverse recovery shoot-through; 500V VRRM accommodates transient clamping requirements. | Use Scenario: Output rectification in 48V-input telecom power supply delivering 12V/10A. IC Role / Device Role / Timing Role: Primary output rectifier in active-clamp forward converter operating at 250 kHz. Use Value: 1.70V VF balances conduction loss vs. MOSFET sync option; DO-201AD allows manual rework and thermal relief pad layout. |
| UPS Battery Charging Circuits | LED Driver Flyback Stages |
Use Scenario: AC/DC front-end rectification feeding battery charging IC in line-interactive UPS. IC Role / Device Role / Timing Role: Input bridge leg component handling 3A RMS input current at 50/60 Hz with peak surges. Use Value: 125A IFSM withstands capacitor inrush; 150°C TJMAX supports sealed enclosure thermal design. | Use Scenario: Secondary-side rectification in isolated LED driver powering 24V/700mA strings. IC Role / Device Role / Timing Role: High-speed output rectifier in discontinuous conduction mode (DCM) flyback. Use Value: 60pF CJ reduces capacitive coupling noise into feedback loop; low VF maintains constant-current regulation accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar super fast rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH3L06S | VRRM = 600V, trr = 35ns, VF = 1.7V @ 3A - identical speed, +100V margin | Preferred where 600V derating required for 400V DC bus transients | Select STTH3L06S when system-level transient protection demands ≥100V overhead beyond nominal bus voltage |
| ON Semi MUR305 | VRRM = 50V, trr = 35ns, VF = 0.95V @ 3A - same speed, lower VRRM, lower VF | Only suitable for ≤40V output circuits; not interchangeable in 500V-rated designs | Choose MUR305 only for low-voltage secondary-side rectification where VRRM < 100V suffices |
Compared with STTH3L06S and MUR305, SF37G R0G delivers optimal balance of 500V rating, 35ns speed, and thermal performance in DO-201AD for mid-range industrial and automotive converters - neither over-specified nor under-rated for typical 400V DC bus systems.
Availability
SF37G R0G is available at Aetrix Electronics and suitable for automotive DC-DC converters, industrial switch-mode power supplies, and UPS battery charging circuits requiring stable component supply and long-term manufacturability.
Supply support for SF37G R0G 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, automotive, and consumer markets since 1979.
The SF3xG series targets high-reliability power conversion applications demanding fast recovery, low loss, and robust packaging - specifically engineered for cost-sensitive yet thermally demanding 3A-class rectification tasks.
FAQ
What is the maximum junction temperature rating for SF37G R0G?
The SF37G R0G has a maximum junction temperature (TJ) rating of +150°C, verified per absolute maximum ratings table in the official Taiwan Semiconductor datasheet revision H2105. This rating allows operation in under-hood automotive environments and sealed industrial enclosures when thermal design accounts for RθJL = 10°C/W and board copper area. Derating curves confirm usable current down to 1.5A at 125°C ambient.
Is SF37G R0G AEC-Q101 qualified?
No, SF37G R0G is not AEC-Q101 qualified. The "R0G" suffix denotes the standard industrial-grade version. AEC-Q101 qualified variants carry the "H" suffix (e.g., SF37GH). Per Taiwan Semiconductor's ordering information, only parts marked with "H" undergo stress testing per AEC-Q101 Rev D; SF37G R0G meets RoHS and halogen-free standards but lacks automotive qualification documentation.
What does the "R0G" suffix mean in SF37G R0G?
The "R0G" suffix in SF37G R0G identifies the packaging and environmental compliance variant: "R" indicates tape-and-reel packaging (1,250 pcs), "0" is a placeholder, and "G" confirms green (halogen-free) molding compound per IEC 61249-2-21. It is distinct from "H" (AEC-Q101) or "A0G" (ammo box) variants - all share identical electrical specs and DO-201AD mechanical form.
How does SF37G R0G compare to SF36G in forward voltage?
SF37G R0G specifies VF = 1.70V max at 3A/25°C, while SF36G is rated at 1.30V max under identical conditions. This 0.4V difference reflects higher doping and wider depletion region in the 500V SF37G R0G versus the 400V SF36G, increasing on-state loss but enabling higher blocking voltage - a trade-off inherent to silicon rectifier design across the SF3xG family.
Can SF37G R0G be used as a direct replacement for 1N5408 in high-frequency designs?
No, SF37G R0G is not a direct replacement for 1N5408 in high-frequency designs. While both are 3A DO-201AD rectifiers, 1N5408 has trr > 2000 ns and VF ≈ 1.2V, making it unsuitable above ~20 kHz. SF37G R0G's 35ns trr enables use up to 500 kHz, but its 1.70V VF increases conduction loss - system-level efficiency and thermal validation is required before substitution in existing 1N5408 layouts.
SF37G R0G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- DO-201AD, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 500 V
- Current - Average Rectified (Io):
- 3A
- Voltage - Forward (Vf) (Max) @ If:
- 1.7 V @ 3 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 35 ns
- Current - Reverse Leakage @ Vr:
- 5 µA @ 500 V
- Capacitance @ Vr, F:
- 60pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-201AD
- Operating Temperature - Junction:
- -55°C ~ 150°C
SF37G R0G FAQ
1.How can I place an order for SF37G R0G through Aetrix?
Please submit a Request for Quotation (RFQ) for SF37G R0G 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 SF37G R0G reliable?
The price and inventory of SF37G R0G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SF37G R0G is usually 5 days.
3.What payment methods are accepted for SF37G R0G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SF37G R0G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SF37G R0G?
SF37G R0G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SF37G R0G 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 SF37G R0G?
For technical support, including SF37G R0G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SF37G R0G requirements.
6.How does Aetrix verify that SF37G R0G is sourced from the original manufacturer or authorized distributors?
All SF37G R0G 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 SF37G R0G meets industry standards.
7.What is the process for return or replacement of SF37G R0G?
All SF37G R0G units undergo pre-shipment inspection (PSI). If there is an issue with SF37G R0G, 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 SF37G R0G part is unused and in its original packaging.
Return procedure for SF37G R0G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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