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Taiwan Semiconductor Corporation SFF503G
- Part No.:
- SFF503G
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Diode Arrays
- Package:
- TO-220-3 Full Pack, Isolated Tab
- Datasheet:
-
SFF503G.pdf
- Description:
- DIODE ARRAY GP 150V 5A ITO220AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,171
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Product details
Overview
SFF503G from Taiwan Semiconductor is a 150 V, 5 A super fast rectifier diode in ITO-220AB package with dual-die configuration, 35 ns reverse recovery time, and 0.98 V forward voltage at 2.5 A - used in DC-DC converters for high-efficiency power conversion.
For engineers reviewing the SFF503G datasheet, SFF503G pinout, SFF503G application, or SFF503G equivalent, key selection criteria include repetitive peak reverse voltage (150 V), thermal resistance (5.5 °C/W), surge capability (70 A), junction temperature range (–55 to +150 °C), and AEC-Q101 qualification availability.
Technical Context
The SFF503G employs a super fast recovery silicon PN junction optimized for switching-mode power supplies. Its 35 ns trr and low VF (0.98 V @ 2.5 A) minimize conduction and switching losses in high-frequency rectification circuits.
Designed as a single-device dual-die rectifier, it supports freewheeling and output rectification in isolated/non-isolated topologies. The ITO-220AB package enables direct heatsink mounting with 0.56 N·m torque specification and UL 94V-0 molding compound.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 150 V - maximum repetitive reverse voltage the device blocks without breakdown |
| IF | 5 A - continuous average forward current rating at case temperature ≤ 100 °C |
| IFSM | 70 A - non-repetitive surge current handling for 8.3 ms half-sine wave |
| trr | 35 ns - reverse recovery time enabling operation up to ~3 MHz switching frequencies |
| RθJC | 5.5 °C/W - thermal resistance from junction to case, critical for heatsink sizing |
| CJ | 70 pF - junction capacitance per diode at 1 MHz, VR = 4 V, impacts EMI and snubber design |
Pinout & Package
Package: ITO-220AB - insulated thermally enhanced outline with three leads, matte tin-plated terminals, UL 94V-0 mold compound, and polarity marking on case.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode 1 | Input terminal for first diode | Connects to high-side switch node in synchronous rectifier or freewheeling path |
| Cathode (Common) | Shared cathode connection | Provides common return path for both internal diodes; electrically tied to metal tab |
| Anode 2 | Input terminal for second diode | Enables dual-channel independent rectification or parallel configuration |
Key Features
| Feature | Design Value |
|---|---|
| Super fast recovery (35 ns) | Reduces switching loss and EMI in SMPS operating above 100 kHz |
| Low VF (0.98 V @ 2.5 A) | Lowers conduction loss by ~15% vs. standard fast rectifiers at same current |
| Dual-die configuration | Supports dual-output DC-DC or interleaved converter designs without external paralleling |
| UL Recognized (E-326243) | Meets safety requirements for end-equipment certification in industrial and consumer power supplies |
Applications
| DC-DC Converter Output Rectification | Switching Mode Inverter Freewheeling |
|---|---|
Use Scenario: Secondary-side rectification in isolated flyback or forward converters delivering 12–48 V outputs at 3–5 A. IC Role / Device Role / Timing Role: Power rectifier converting high-frequency AC from transformer secondary into regulated DC output. Use Value: 0.98 V VF and 35 ns trr reduce total power loss by ≥12% versus standard fast diodes at 250 kHz switching. | Use Scenario: Freewheeling path across inductive loads in motor drive inverters or UPS systems. IC Role / Device Role / Timing Role: Provides low-loss current recirculation path during MOSFET/IGBT off-time. Use Value: Dual-die layout allows independent anode routing to separate inductive legs, minimizing cross-talk and layout parasitics. |
| Automotive DC-DC Module | Industrial SMPS Auxiliary Supply |
Use Scenario: 12 V to 5 V/3.3 V buck-derived auxiliary supply in AEC-Q101-compliant vehicle ECUs. IC Role / Device Role / Timing Role: Primary rectifier in self-oscillating or controller-driven flyback auxiliary winding. Use Value: AEC-Q101 qualified version (SFF503GH) meets automotive reliability and temperature cycling requirements. | Use Scenario: Standby or control rail generation in industrial PLC power modules requiring long-term thermal stability. IC Role / Device Role / Timing Role: High-reliability rectifier in 24 V input SMPS with wide ambient temperature range (–40 to +85 °C). Use Value: 150 °C max junction temperature and JESD201 Class 2 whisker resistance ensure stable operation over 10+ year field life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar super fast rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH5L06 | 600 V VRRM, 5 A IF, 50 ns trr, TO-220AC package, single die | Higher voltage rating but slower recovery; not dual-die | Preferred where higher blocking voltage is required and dual-anode functionality is unnecessary |
| VS-5EY1502-M3 | 150 V VRRM, 5 A IF, 35 ns trr, TO-220AB package, single die, AEC-Q101 qualified | Same voltage/speed rating but no dual-die; different thermal pad isolation | Valid alternative when dual-anode topology is not used and UL recognition is not mandatory |
Compared with STTH5L06 and VS-5EY1502-M3, the SFF503G uniquely provides dual-anode rectification in a UL-recognized, thermally optimized ITO-220AB package - essential for compact dual-output or interleaved converter designs requiring <40 ns recovery and automotive-grade reliability options.
Availability
SFF503G is available at Aetrix Electronics and suitable for DC-DC converters, switching mode inverters, and freewheeling applications requiring stable component supply, consistent parametric performance, and long-term industrial lifecycle support.
Supply support for SFF503G 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 since 1979.
The SFF503G belongs to TSC's SFF50xG super fast rectifier family, engineered for high-efficiency, high-reliability power conversion in automotive, industrial, and computing power supplies where low VF, fast trr, and robust thermal performance are critical.
FAQ
What is the maximum junction temperature rating for the SFF503G?
The SFF503G has a maximum junction temperature (TJ) of +150 °C, with a storage temperature range of –55 to +150 °C. This rating enables reliable operation in high-ambient environments such as enclosed industrial power supplies or under-hood automotive modules when properly heatsinked. Derating curves in the datasheet define safe operating current limits above 100 °C case temperature.
Is the SFF503G pin-compatible with other devices in the SFF50xG series?
Yes, all SFF50xG devices including the SFF503G share identical ITO-220AB packaging, pinout, and mechanical footprint - only VRRM and VF vary across the series. This allows drop-in replacement during design iteration or voltage-scaling without PCB changes, provided thermal and electrical margins remain within spec for the selected variant.
Does the SFF503G have AEC-Q101 qualification?
The base SFF503G is not AEC-Q101 qualified, but its variant SFF503GH is explicitly qualified per AEC-Q101 Rev D. The "H" suffix denotes automotive-grade screening, including extended temperature cycling, bias-HAST, and mechanical shock testing. Designers targeting automotive applications must specify SFF503GH to meet functional safety requirements.
How does the dual-die configuration of the SFF503G affect circuit layout?
Its dual-die configuration gives the SFF503G two independent anodes sharing one cathode, enabling separate high-side connections for dual-output or interleaved converters. Layout must maintain symmetrical trace lengths and impedance between anodes to avoid current imbalance; the common cathode should be routed directly to ground/power plane with minimal inductance to preserve fast recovery behavior.
What is the typical junction-to-case thermal resistance of the SFF503G?
The SFF503G has a typical junction-to-case thermal resistance (RθJC) of 5.5 °C/W, measured under standard mounting conditions with 0.56 N·m torque and thermal interface material. This value is critical for calculating maximum allowable power dissipation and selecting appropriate heatsink size - for example, at 5 A and 0.98 V VF, junction temperature rise is ~27 °C above case temperature.
SFF503G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- TO-220-3 Full Pack, Isolated Tab
- Packaging:
- Tube
- Product Status:
- Active
- Diode Configuration:
- 1 Pair Common Cathode
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 150 V
- Current - Average Rectified (Io) (per Diode):
- 5A
- Voltage - Forward (Vf) (Max) @ If:
- 980 mV @ 2.5 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 35 ns
- Current - Reverse Leakage @ Vr:
- 10 µA @ 150 V
- Operating Temperature - Junction:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- ITO-220AB
SFF503G FAQ
1.How can I place an order for SFF503G through Aetrix?
Please submit a Request for Quotation (RFQ) for SFF503G 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 SFF503G reliable?
The price and inventory of SFF503G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SFF503G is usually 5 days.
3.What payment methods are accepted for SFF503G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SFF503G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SFF503G?
SFF503G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SFF503G 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 SFF503G?
For technical support, including SFF503G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SFF503G requirements.
6.How does Aetrix verify that SFF503G is sourced from the original manufacturer or authorized distributors?
All SFF503G 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 SFF503G meets industry standards.
7.What is the process for return or replacement of SFF503G?
All SFF503G units undergo pre-shipment inspection (PSI). If there is an issue with SFF503G, 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 SFF503G part is unused and in its original packaging.
Return procedure for SFF503G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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