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Taiwan Semiconductor Corporation RSFAL
- Part No.:
- RSFAL
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-219AB
- Datasheet:
-
RSFAL.pdf
- Description:
- DIODE GEN PURP 50V 500MA SUB SMA
- Quantity:
- Payment:
- Shipping:
Inventory:8,375
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Product details
Overview
RSFAL from Taiwan Semiconductor is a 0.5A, 50V fast recovery surface-mount rectifier in Sub SMA package, featuring 150 ns reverse recovery time, 1.3 V max forward voltage at 0.5A, and 10 A peak surge current - used in DC-DC converters and switching-mode power supplies for high-efficiency AC/DC and DC/DC conversion.
For engineers reviewing the RSFAL datasheet, RSFAL pinout, RSFAL application, or RSFAL equivalent, key selection criteria include repetitive peak reverse voltage (50 V), thermal resistance (RθJA = 150 °C/W), junction temperature range (–55 to +150 °C), moisture sensitivity level (J-STD-020 Level 1), and RoHS/halogen-free compliance.
Technical Context
The RSFAL is a single-die, glass-passivated fast recovery rectifier optimized for high-frequency switching applications. Its construction uses high-temperature metallurgical bonding and matte tin-plated leads compliant with J-STD-002 solderability standards.
It delivers low reverse recovery charge (Qrr) implied by trr ≤ 150 ns, junction capacitance of 4 pF at 1 MHz/4 V, and reverse leakage of only 5 µA at 25°C - enabling reduced switching losses in compact SMPS designs operating up to 150°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IF (Avg) | 0.5 A - continuous forward current rating defines maximum steady-state conduction capability in power supply output stages |
| VRRM | 50 V - maximum repetitive reverse voltage determines minimum input/output isolation margin in low-voltage DC-DC converters |
| trr | 150 ns - fast reverse recovery time enables operation at >100 kHz switching frequencies with minimal turn-off loss |
| VF (max) | 1.3 V @ 0.5A - forward voltage drop directly impacts conduction loss and thermal design in low-voltage, high-current paths |
| RθJA | 150 °C/W - junction-to-ambient thermal resistance sets required PCB copper area and airflow for thermal management |
| IR (max) | 5 µA @ 25°C - low reverse leakage preserves efficiency in high-impedance bias networks and standby circuits |
| CJ | 4 pF @ 1 MHz - low junction capacitance minimizes capacitive coupling noise and improves EMI performance in high-speed switching nodes |
Pinout & Package
Package: Sub SMA - surface-mount, molded plastic case meeting UL 94V-0 flammability rating; cathode indicated by band; matte tin-plated leads; weight ≈ 0.019 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential side (e.g., transformer secondary center-tap or switch node) in bridge or half-wave configurations |
| Cathode | Forward current exit point | Connected to output filter capacitor or load; polarity marked by visible cathode band on package body |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Enhances long-term reliability under humidity and thermal cycling stress, critical for industrial-grade power supplies |
| Fast recovery (trr ≤ 150 ns) | Reduces switching loss and EMI generation in high-frequency flyback and forward converters |
| J-STD-020 Level 1 MSL | Enables standard SMT reflow without baking, supporting automated assembly in high-volume manufacturing |
| RoHS & halogen-free | Meets IEC 61249-2-21 and global environmental compliance requirements for consumer and industrial end equipment |
| Sub SMA mechanical robustness | Withstands board flexure and thermal expansion mismatch better than standard SMA in dense PCB layouts |
Applications
| DC-DC Converter Output Rectification | Switching Mode Inverter Auxiliary Supply |
|---|---|
Use Scenario: Secondary-side rectification in isolated 5–24 V output DC-DC converters operating at 100–500 kHz. IC Role / Device Role / Timing Role: Fast recovery rectifier conducting unidirectional current during transformer demagnetization phase. Use Value: 150 ns trr and 1.3 V VF minimize conduction and switching losses, improving efficiency above 88% at full load. | Use Scenario: Auxiliary bias supply rectification in three-phase motor inverters where space and thermal density are constrained. IC Role / Device Role / Timing Role: Low-leakage, high-reliability rectifier delivering stable gate driver or control logic power. Use Value: 5 µA IR at 25°C and –55°C to +150°C TJ range ensure stable startup and fault-free operation across ambient extremes. |
| Industrial SMPS Input Stage | LED Driver Constant-Current Loop |
Use Scenario: Input rectification in universal-input (85–265 VAC) offline SMPS with PFC front-end. IC Role / Device Role / Timing Role: Fast-recovery diode handling high dv/dt transients during MOSFET switching transitions. Use Value: 10 A IFSM withstands inrush surges; 4 pF CJ limits capacitive feedthrough noise into sensitive control circuitry. | Use Scenario: Secondary-side synchronous rectification or freewheeling path in constant-current LED drivers for signage and street lighting. IC Role / Device Role / Timing Role: Freewheeling diode clamping inductor current during PWM off-time in buck-derived topologies. Use Value: Sub SMA footprint enables high-density layout; 0.019 g mass reduces mechanical stress on flexible LED modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fast recovery rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH0.5L06S | 600 V VRRM, 1.15 V VF @ 0.5A, trr = 75 ns, SMA package | Higher voltage rating suits 230 VAC input stages; faster trr benefits >1 MHz designs | Select when higher reverse voltage margin or tighter switching loss budget is required |
| ES1B | 100 V VRRM, 1.7 V VF @ 1A, trr = 35 ns, SMA package | Lower VRRM but faster recovery; higher VF increases conduction loss at 0.5A | Prefer for ultra-high-frequency (<500 kHz), low-voltage auxiliary rails where speed outweighs VF penalty |
Compared with STTH0.5L06S and ES1B, the RSFAL offers optimal balance of 50 V rating, 150 ns trr, and 1.3 V VF for cost-sensitive, thermally constrained low-voltage DC-DC outputs - especially where J-STD-020 Level 1 handling and halogen-free compliance are mandatory.
Availability
RSFAL is available at Aetrix Electronics and suitable for DC-DC converter output rectification, switching mode inverter auxiliary supplies, and industrial SMPS input stages requiring stable component supply, consistent parametric performance, and full traceability.
Supply support for RSFAL 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 consumer markets since 1979.
The RSFAL belongs to TSC's RSF series of fast recovery rectifiers designed specifically for high-efficiency, surface-mount power conversion in space-constrained and thermally demanding applications.
FAQ
What is the maximum junction temperature rating for RSFAL?
The RSFAL has a maximum junction temperature (TJ) rating of +150°C, with an operational range from –55°C to +150°C. This allows reliable use in enclosed industrial power supplies and automotive under-hood auxiliary circuits where ambient temperatures exceed 85°C. Derating curves in the RSFAL datasheet confirm 0.5 A average current remains valid up to 125°C case temperature.
Is RSFAL RoHS and halogen-free compliant?
Yes, the RSFAL is fully RoHS compliant and halogen-free per IEC 61249-2-21. The molding compound contains no brominated flame retardants or chlorine-based additives, and all terminals meet EU Directive 2011/65/EU requirements. This compliance is verified in TSC's M2103 version release documentation and confirmed on official Taiwan Semiconductor product pages.
What does the marking code 'FAL' indicate on RSFAL devices?
The marking code 'FAL' laser-etched on the RSFAL package identifies the specific variant within the RSF series: 'F' denotes fast recovery, 'A' indicates 50 V VRRM, and 'L' specifies Sub SMA packaging. This matches the ordering code RSFAL and distinguishes it from RSFBL (100 V), RSFDL (200 V), and other members of the RSFAL–RSFML family.
Can RSFAL be used in place of a standard 1N4001 rectifier?
No - while both are general-purpose rectifiers, the RSFAL is a fast recovery device (trr ≤ 150 ns) versus the 1N4001's 30 µs recovery time. Substituting RSFAL in low-frequency (<1 kHz), high-voltage line rectification may cause overvoltage stress due to its lower VRRM (50 V vs. 50–1000 V for 1N400x). RSFAL is intended for high-frequency SMPS, not 50/60 Hz mains applications.
What is the moisture sensitivity level (MSL) of RSFAL and how does it affect assembly?
The RSFAL has a J-STD-020 moisture sensitivity level (MSL) of Level 1 - meaning it can be stored indefinitely at ≤30°C/85% RH and subjected to standard reflow profiles (e.g., IPC/JEDEC J-STD-020D) without pre-baking. This eliminates dry-pack requirements and simplifies SMT line integration for high-volume manufacturing of RSFAL-based power modules.
RSFAL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- DO-219AB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 50 V
- Current - Average Rectified (Io):
- 500mA
- Voltage - Forward (Vf) (Max) @ If:
- 1.3 V @ 500 mA
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 150 ns
- Current - Reverse Leakage @ Vr:
- 5 µA @ 50 V
- Capacitance @ Vr, F:
- 4pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- Sub SMA
- Operating Temperature - Junction:
- -55°C ~ 150°C
RSFAL FAQ
1.How can I place an order for RSFAL through Aetrix?
Please submit a Request for Quotation (RFQ) for RSFAL 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 RSFAL reliable?
The price and inventory of RSFAL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RSFAL is usually 5 days.
3.What payment methods are accepted for RSFAL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RSFAL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RSFAL?
RSFAL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RSFAL 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 RSFAL?
For technical support, including RSFAL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RSFAL requirements.
6.How does Aetrix verify that RSFAL is sourced from the original manufacturer or authorized distributors?
All RSFAL 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 RSFAL meets industry standards.
7.What is the process for return or replacement of RSFAL?
All RSFAL units undergo pre-shipment inspection (PSI). If there is an issue with RSFAL, 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 RSFAL part is unused and in its original packaging.
Return procedure for RSFAL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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