SFP2003 Super Fast Recovery Rectifier Diode: Fast, Ultra Fast & Fast Recovery Diodes Explained
1. What Is a Fast Rectifier Diode (FRD)?
A fast rectifier diode (FRD) is a diode designed to:
- Conduct in the forward direction
- Block current in the reverse direction
- Switch from conduction to blocking very quickly, with a short reverse recovery time (trr)
Reverse recovery time (trr) is the time it takes the diode to stop conducting after the forward current is removed and a reverse voltage is applied. In high‑frequency switching, long trr increases switching losses and EMI, while short trr reduces both.
Typical Characteristics of Fast Rectifier Diodes
-
Reverse recovery time (trr):
About 50–100 ns, versus microseconds (µs) for standard rectifier diodes. -
Forward voltage (VF):
Slightly higher than standard rectifiers, e.g. ~1.3–1.5 V. -
Reverse leakage current:
Low (µA to tens of µA), important for efficiency and high‑temperature stability. -
Voltage ratings:
Commonly 600–1000 V and above for off‑line and industrial applications.
Applications:
Switching power supplies (SMPS), AC–DC converters, inverters, power factor correction (PFC) circuits and other high‑frequency rectifiers or freewheeling paths.
2. Ultra Fast vs Super Fast Rectifier Diodes
Within the family of fast rectifier diodes, manufacturers often distinguish:
Ultra Fast Rectifier Diodes
-
Reverse recovery time (trr):
Around 25 ns or less. -
Forward voltage (VF):
Typically higher, sometimes 3.0–3.6 V for certain high‑voltage devices. -
Use case:
Very high‑frequency switching and demanding high‑speed power stages. -
Trade‑off:
Extremely low trr (lower switching loss) at the cost of higher VF (higher conduction loss and more heat).
Super Fast Rectifier Diodes
- Generally faster than standard FRDs but not always as extreme as ultra fast types.
-
Reverse recovery time (trr):
Often around 35–50 ns range. -
Forward voltage (VF):
Slightly higher than standard FRDs, but typically lower than the highest‑speed ultra fast types. -
Use case:
High‑frequency switching where a balance between efficiency and speed is needed.
Simple Comparison
| Type | Typical trr | Typical VF | Typical Use Case |
|---|---|---|---|
| Standard rectifier diode | µs range | ~1.0 V | 50/60 Hz mains rectification |
| Fast rectifier diode (FRD) | 50–100 ns | ~1.3–1.5 V | Medium‑frequency switching (<100 kHz) |
| Super fast rectifier diode | ~35–50 ns | ~1.5–2.5 V | High‑frequency switching |
| Ultra fast rectifier diode | ~25 ns or less | up to ~3.0–3.6 V | Very high‑frequency, high‑speed power stages |
Values vary by manufacturer and voltage rating, but the trends are consistent.
3. Rectifier Diode vs Fast Recovery Diode
A standard rectifier diode is intended for low‑frequency rectification, typically 50/60 Hz AC mains. A fast recovery diode (FRD) is optimized for high‑frequency switching.
Key Differences
| Feature | Standard Rectifier Diode | Fast Recovery Diode (FRD) |
|---|---|---|
| Reverse recovery time (trr) | Several µs | Tens to hundreds of ns |
| Forward voltage drop (VF) | Lower (~1.0 V) | Slightly higher (~1.3–1.5 V) |
| Switching frequency | Low frequency (50/60 Hz) | High frequency (kHz range) |
| Applications | General rectification | SMPS, inverters, PFC, high‑frequency rectifiers |
| Power loss profile | Lower conduction loss, higher switching loss | Lower switching loss, slightly higher conduction loss |
| Thermal management | Less demanding | More critical due to higher VF and faster operation |
In high‑frequency switching, FRDs are preferred because they reduce switching losses and EMI, allowing higher efficiency and smaller magnetics.
4. SFP2003: A Super Fast Recovery Rectifier Diode Example
The SFP2003 is a practical example of a super fast recovery rectifier diode designed for high‑efficiency, high‑frequency power electronics.
Core Specification Highlights
- Type: Super fast recovery rectifier diode
- Package: TO‑247AB (through‑hole, high‑power)
- Repetitive peak reverse voltage (VRRM): 300 V
-
Average rectified forward current (IFAV): 20 A
- Rated with 20 kHz square wave, 50% duty cycle
- Reverse recovery time (trr): ≤ 35 ns
- Forward surge current (IFSM): 180 × 2 A (8.3 ms half sine, JEDEC)
- Operating junction temperature (TJ): up to 175 °C
- Junction‑to‑case thermal resistance (RθJC, per leg): 0.5 °C/W
Key Electrical Characteristics
At TJ = 25 °C:
- Breakdown voltage (VB): ≥ 300 V at IR = 100 µA
-
Reverse leakage current (IR):
- ≤ 0.01 mA at VR = 300 V, 25 °C
- ≤ 0.10 mA at VR = 300 V, 125 °C
-
Forward voltage (VF):
- Typ. 1.0 V, max 1.1 V at IF = 10 A (IFAV = 10 A × 2)
- Max 1.0 V at elevated junction temperature (125 °C)
These characteristics place SFP2003 in the super fast recovery class:
- trr ≤ 35 ns → suitable for high‑frequency switching
- VF ~1.0–1.1 V → relatively low conduction loss for a 20 A device
- High surge capability and high TJ → robust in demanding industrial and power applications
5. Typical Applications of SFP2003
The SFP2003 super fast recovery rectifier diode is suitable for:
-
Switching Power Supplies (SMPS):
- Output rectification in AC–DC or DC–DC stages
- High‑frequency secondary‑side rectification
-
Inverters and Motor Drives:
- Freewheeling diode across inductive loads
- Rectification in DC–AC conversion paths for renewable energy, UPS, and drive systems
-
PWM and High‑Frequency Rectification:
- High‑frequency rectifier for DC–DC converters
- Damping or snubber diode in switching nodes to control voltage spikes
Whenever a design requires a 300 V, 20 A, super fast recovery rectifier with robust thermal performance, SFP2003 is a strong candidate.
6. How Reverse Recovery Time Affects SFP2003’s Performance
The 35 ns reverse recovery time of SFP2003 helps:
- Reduce switching losses in MOSFET/IGBT stages
- Lower EMI and voltage spikes, especially with good PCB layout and snubbers
- Enable higher switching frequencies, helping shrink magnetics and improve power density
Compared with standard rectifier diodes, SFP2003’s fast recovery behavior is a clear advantage in any design above low kHz switching frequencies.
7. Selecting the Right Diode for Your Design
When selecting between standard rectifier diodes, FRDs, super fast or ultra fast rectifier diodes:
-
Check switching frequency
- 50/60 Hz: standard rectifier diode is enough
- Tens–hundreds of kHz: fast or super fast diodes like SFP2003
- Very high frequency: ultra fast rectifier diodes
-
Balance VF and trr
- Lower trr reduces switching loss
- Higher VF increases conduction loss and heat
- Choose based on overall efficiency, thermal limits and budget
-
Verify voltage and current ratings
- Ensure VRRM exceeds your max reverse voltage with margin
- Ensure IFAV and IFSM cover both continuous and surge conditions
-
Consider thermal design
- Use proper heatsinking and PCB copper area
- For TO‑247 devices like SFP2003, ensure good case‑to‑heatsink contact and airflow
8. How to Buy SFP2003: Ordering & Quotations
To move from design to production, you need a reliable source and commercial terms for the SFP2003 super fast recovery rectifier diode.
Supplier Information
Company: Jiangsu Guanlong Integrated Technology Co., Ltd.
Address: Consumer Goods Market, Room 208‑946,
Zhangjiagang FTZ, Jiangsu 215634, China
Jiangsu Guanlong Integrated Technology Co., Ltd. supports customers in China and worldwide with:
- Engineering samples for evaluation (subject to availability)
- Volume supply for OEM/ODM projects
- Flexible logistics options via the Zhangjiagang Free Trade Zone
Request a Quote (RFQ) for SFP2003
When you contact the sales team, provide:
- Target quantity (sample, pilot run, mass production)
- Required delivery schedule and project timeline
- Key technical requirements (e.g., operating voltage, frequency, environment)
- Any compliance needs (RoHS, halogen‑free, specific standards)
The sales team can then:
- Confirm latest price and MOQ
- Provide lead time and shipping options
- Share the latest SFP2003 datasheet and quality documentation
You can reach Jiangsu Guanlong Integrated Technology Co., Ltd. via:
- Your existing sales contact or distributor
- The company’s official website or online inquiry form
- Phone or email details provided through their corporate channels
9. Why Source SFP2003 from Jiangsu Guanlong Integrated Technology Co., Ltd.?
-
Location advantage:
Based in Zhangjiagang Free Trade Zone, Jiangsu, China, allowing efficient export logistics and competitive shipping options. -
Power semiconductor focus:
Experience handling rectifier diodes, fast recovery devices and other power components for industrial, renewable, and consumer markets. -
Engineering support:
Assistance in matching SFP2003 to your application requirements and providing reference documentation.
For long‑term programs, you can also discuss:
- Annual or project‑based supply agreements
- Preferred pricing for volume commitments
- Safety stock or buffer arrangements depending on demand stability
10. FAQ: SFP2003 and Fast Rectifier Diodes
Q1. What kind of rectifier diode is SFP2003?
SFP2003 is a super fast recovery rectifier diode, rated at 300 V and 20 A, with a reverse recovery time of ≤ 35 ns in a TO‑247 package.
Q2. Where is SFP2003 typically used?
It is used in switching power supplies, inverters, DC–DC converters and other high‑frequency rectification or freewheeling applications where fast recovery and good efficiency are needed.
Q3. How does SFP2003 compare to a standard rectifier diode?
Compared to a standard rectifier diode with microsecond‑level trr, SFP2003 switches off much faster (tens of nanoseconds), reducing switching loss and EMI, and enabling higher switching frequencies.
Q4. What should I pay attention to when using SFP2003?
Ensure the device’s VRRM, IFAV and IFSM ratings comfortably exceed your operating conditions and that you provide adequate heatsinking and good PCB layout to handle thermal and switching stresses.
Q5. How can I buy SFP2003 from Jiangsu Guanlong Integrated Technology Co., Ltd.?
You can request a quotation by contacting Jiangsu Guanlong Integrated Technology Co., Ltd. at their Zhangjiagang FTZ address or via their official sales channels. Provide your target quantity, delivery schedule and application details so they can respond with pricing, lead time and technical support.