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Taiwan Semiconductor Corporation RS1AFL
- Part No.:
- RS1AFL
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- SOD-123F
- Datasheet:
-
RS1AFL.pdf
- Description:
- 150NS, 1A, 50V, FAST RECOVERY RE
- Quantity:
- Payment:
- Shipping:
Inventory:4,928
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Product details
Overview
RS1AFL from Taiwan Semiconductor is a 1 A, 50 V fast recovery surface-mount rectifier in SOD-123FL package, featuring 0.91 V forward voltage at 1.0 A and 25°C, 150 ns reverse recovery time, and 17 °C/W junction-to-lead thermal resistance - optimized for DC-DC converters and switching-mode power supplies.
For engineers reviewing the RS1AFL datasheet, RS1AFL pinout, RS1AFL application, or RS1AFL equivalent, key selection criteria include its 50 V repetitive peak reverse voltage, 30 A surge current rating, low-profile SOD-123FL footprint, and J-STD-020 Level 1 moisture sensitivity - critical for high-density automated assembly and thermally constrained power stages.
Technical Context
The RS1AFL is a single-die, glass-passivated silicon PN junction rectifier with fast recovery characteristics, designed for high-frequency switching applications where low forward voltage drop and minimal reverse recovery charge are essential. Its SOD-123FL package enables compact PCB layouts while maintaining robust thermal performance via low RθJL (17 °C/W).
It operates across -55°C to +150°C junction temperature range, supports 1 A continuous forward current, and delivers stable reverse leakage (<5 µA at 25°C) and predictable capacitance (15 pF at 1 MHz, 4 V), enabling reliable operation in isolated flyback and buck-derived topologies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 50 V - maximum repetitive reverse blocking voltage; defines safe operating limit in unidirectional DC bus or clamp circuits |
| IF | 1 A - continuous average forward current; determines steady-state power dissipation and heatsink requirements |
| trr | 150 ns - reverse recovery time at IF = 0.5 A, IR = 1.0 A; impacts switching losses and EMI in >100 kHz converters |
| VF | 0.91 V @ 1.0 A, 25°C - forward voltage drop; directly sets conduction loss and thermal load in high-duty-cycle operation |
| RθJL | 17 °C/W - junction-to-lead thermal resistance; enables direct PCB copper pad cooling without external heatsink |
| IFSM | 30 A - non-repetitive surge current (8.3 ms half-sine); supports inrush and fault-current handling in SMPS input stages |
Pinout & Package
SOD-123FL is a low-profile, surface-mount plastic package with two terminals: anode and cathode. Polarity is marked by a visible cathode band on the device body. Leads are matte tin-plated and solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential side (e.g., switch node or ground return) in rectification path |
| Cathode | Forward current exit point | Marked with band; connects to output rail or positive bus; carries full load current and reverse-blocking stress |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated chip junction | Enhances long-term reliability under humidity and thermal cycling; eliminates need for conformal coating in industrial environments |
| Moisture sensitivity level 1 (J-STD-020) | Enables immediate reflow without baking; reduces manufacturing overhead in high-volume SMT lines |
| Low profile SOD-123FL package | 0.9 mm max height; allows stacking under shields or in ultra-thin power modules and portable electronics |
| RoHS and halogen-free compliance | Meets IEC 61249-2-21; supports global environmental compliance without derating or material substitution |
Applications
| DC–DC Converter Output Rectification | Switching Mode Inverter Freewheeling |
|---|---|
Use Scenario: Secondary-side synchronous or diode rectification in isolated 5–24 V DC–DC converters for telecom and embedded systems. IC Role / Device Role / Timing Role: Unidirectional current steering device; blocks reverse voltage during transformer reset and conducts forward current during duty cycle. Use Value: 0.91 V VF minimizes conduction loss at 1 A, while 150 ns trr limits switching loss and EMI generation in 300–500 kHz designs. | Use Scenario: Freewheeling path in half-bridge or full-bridge inverters driving inductive loads like fans or pumps. IC Role / Device Role / Timing Role: Provides low-loss current recirculation path when high-side switch turns off; clamps inductive kickback. Use Value: 30 A IFSM withstands motor startup surges; 17 °C/W RθJL ensures stable operation without forced air in sealed enclosures. |
| AC–DC Adapter Input Bridge Leg | General Purpose Low-Power Supply Rectification |
Use Scenario: Single-diode leg in compact 5–12 V AC–DC adapters using voltage-doubler or half-wave topology. IC Role / Device Role / Timing Role: Half-wave rectifier converting AC input to pulsating DC; operates at line frequency with brief conduction windows. Use Value: 50 V VRRM safely handles 35 V RMS input with margin; 0.016 g weight supports lightweight portable design goals. | Use Scenario: Low-cost, space-constrained rectification in battery chargers, LED drivers, and sensor interface power rails. IC Role / Device Role / Timing Role: General-purpose unidirectional current valve; used where speed and efficiency outweigh cost sensitivity. Use Value: SOD-123FL footprint fits 2.0 × 1.25 mm PCB area; J-STD-020 Level 1 enables direct placement into reflow ovens without dry-pack handling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fast recovery rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MUR105 | Same 1 A / 50 V rating but TO-220AC package; higher RθJA (50 °C/W), larger footprint, no moisture level rating | Requires heatsink mounting and manual assembly; unsuitable for high-density SMT-only production | Choose only if through-hole assembly or higher surge tolerance (50 A IFSM) is required |
| Vishay VS-1EQH05-M3/5AT | SOD-123FL package, same 1 A / 50 V, but 120 ns trr and 0.87 V VF; RoHS/halogen-free compliant | Better high-frequency efficiency and lower conduction loss; identical board-level integration | Prefer for new designs targeting <100 ns recovery or tighter thermal budgets |
Compared with MUR105 and VS-1EQH05-M3/5AT, the RS1AFL offers optimal balance of SMT compatibility, J-STD-020 Level 1 handling, and proven thermal performance in thin-profile power supplies - making it ideal for volume-manufactured consumer and industrial DC–DC modules.
Availability
RS1AFL is available at Aetrix Electronics and suitable for DC–DC converter output rectification, switching mode inverter freewheeling, and general purpose low-power supply rectification requiring stable component supply and consistent SOD-123FL form factor.
Supply support for RS1AFL 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 for industrial and consumer markets.
The RS1AFL belongs to TSC's RS1xFL fast recovery rectifier family, engineered specifically for high-efficiency, surface-mount switching power supplies where low VF, fast trr, and automated assembly readiness are mandatory.
FAQ
What is the maximum junction temperature rating for RS1AFL?
The RS1AFL has a maximum junction temperature (TJ) rating of +150°C, with operational capability down to -55°C. This wide range supports use in enclosed industrial power supplies and automotive under-hood auxiliary circuits where ambient temperatures exceed 85°C. The RS1AFL maintains specified electrical parameters within this full range, provided thermal design respects RθJL = 17 °C/W and PCB copper area meets JEDEC test conditions.
Is RS1AFL suitable for high-frequency switching applications above 200 kHz?
Yes, the RS1AFL is suitable for high-frequency switching applications up to 500 kHz due to its 150 ns reverse recovery time and low junction capacitance (15 pF). These characteristics minimize switching losses and EMI generation in DC–DC converters and resonant topologies. The RS1AFL's fast recovery behavior is verified under standard test conditions (IF = 0.5 A, IR = 1.0 A), confirming stable performance in hard-switched SMPS designs.
What does the marking code "RAF" indicate on RS1AFL devices?
The marking code "RAF" on RS1AFL devices identifies the specific variant within the RS1xFL family and confirms its 50 V VRRM rating. Per TSC documentation, "RAF" is the standardized top-side laser marking for RS1AFL units, distinguishing them from RS1BFL (RBF, 100 V) and higher-voltage variants. This code enables traceability and visual verification during incoming inspection and SMT placement.
Does RS1AFL require baking before reflow soldering?
No, RS1AFL does not require baking before reflow soldering because it is rated at Moisture Sensitivity Level 1 per J-STD-020. This means the device can be stored indefinitely at ≤30°C/60% RH and placed directly into standard lead-free reflow profiles without preconditioning. The RS1AFL's SOD-123FL package construction and internal passivation ensure zero popcorning risk under IPC/JEDEC conditions.
How does RS1AFL compare to standard recovery rectifiers in terms of efficiency?
The RS1AFL improves efficiency over standard recovery rectifiers primarily through its 150 ns reverse recovery time and 0.91 V forward voltage at 1.0 A - reducing both switching and conduction losses. In a 250 kHz buck converter delivering 1 A, this translates to ~15% lower total rectifier loss versus a 1N4007-equivalent part. The RS1AFL's low RθJL (17 °C/W) further enhances thermal efficiency by enabling direct PCB heat spreading without added thermal interface materials.
RS1AFL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- SOD-123F
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 50 V
- Current - Average Rectified (Io):
- 1A
- Voltage - Forward (Vf) (Max) @ If:
- 1.05 V @ 1 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 150 ns
- Current - Reverse Leakage @ Vr:
- 5 µA @ 50 V
- Capacitance @ Vr, F:
- 15pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123F
- Operating Temperature - Junction:
- -55°C ~ 150°C
RS1AFL FAQ
1.How can I place an order for RS1AFL through Aetrix?
Please submit a Request for Quotation (RFQ) for RS1AFL 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 RS1AFL reliable?
The price and inventory of RS1AFL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RS1AFL is usually 5 days.
3.What payment methods are accepted for RS1AFL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RS1AFL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RS1AFL?
RS1AFL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RS1AFL 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 RS1AFL?
For technical support, including RS1AFL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RS1AFL requirements.
6.How does Aetrix verify that RS1AFL is sourced from the original manufacturer or authorized distributors?
All RS1AFL 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 RS1AFL meets industry standards.
7.What is the process for return or replacement of RS1AFL?
All RS1AFL units undergo pre-shipment inspection (PSI). If there is an issue with RS1AFL, 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 RS1AFL part is unused and in its original packaging.
Return procedure for RS1AFL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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