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Taiwan Semiconductor Corporation RS2KAF-T
- Part No.:
- RS2KAF-T
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
RS2KAF-T.pdf
- Description:
- 250NS, 2A, 800V, FAST RECOVERY R
- Quantity:
- Payment:
- Shipping:
Inventory:7,390
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Product details
Overview
RS2KAF-T from Taiwan Semiconductor is a 2 A, 800 V fast recovery surface-mount rectifier in SMAF package, featuring 250 ns reverse recovery time, 1.14 V forward voltage at 2 A/25°C, and 100 µA max reverse leakage at 125°C. It serves as primary-side output rectifier in high-efficiency DC-DC converters and switching inverters.
For engineers reviewing the RS2KAF-T datasheet, RS2KAF-T pinout, RS2KAF-T application, or RS2KAF-T equivalent, key selection criteria include peak reverse voltage rating, thermal resistance (RθJL = 15 °C/W), junction capacitance (10 pF), and compliance with J-STD-020 Level 1 moisture sensitivity.
Technical Context
The RS2KAF-T employs a glass-passivated single-die silicon junction optimized for fast switching in high-frequency power conversion. Its 800 V VRRM and 250 ns trr enable use in 100–500 kHz SMPS topologies where low switching loss and minimal reverse recovery charge are critical.
Thermal performance is defined for mounting on a 5 mm × 5 mm copper pad: RθJA = 89 °C/W, RθJC = 22 °C/W, and RθJL = 15 °C/W - supporting sustained 2 A conduction at TJ ≤ 150°C under typical PCB layout conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 800 V - supports input rectification up to 565 VDC or 800 VPK in offline SMPS |
| IF | 2 A continuous - rated for steady-state output current in compact 15–30 W adapters |
| trr | 250 ns - reduces switching losses and EMI in high-frequency flyback and forward converters |
| VF @ 2 A / 25°C | 1.14 V - contributes ~2.3 W conduction loss at full load, manageable with standard thermal pads |
| CJ | 10 pF @ 1 MHz / 4 V - minimizes capacitive coupling noise in gate-drive and feedback paths |
| IR @ 125°C | 100 µA max - ensures stable blocking during high-temperature operation without thermal runaway |
| RθJL | 15 °C/W - enables direct heat transfer to PCB copper, simplifying thermal design vs. through-hole alternatives |
Pinout & Package
Package: SMAF (Surface-Mount Axial Flat) - molded plastic case meeting UL 94V-0, matte tin-plated leads, cathode indicated by band, weight ≈ 0.035 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connected to lower-potential node (e.g., transformer secondary center-tap or MOSFET source) |
| Cathode | Current exit point during forward conduction; polarity marker via band | Connected to output rail or filter capacitor positive terminal; defines unidirectional current path |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Enhances long-term reliability under humidity and thermal cycling; eliminates need for conformal coating in industrial environments |
| J-STD-020 Level 1 moisture sensitivity | Enables direct placement without baking or dry-pack handling - reduces SMT line downtime and cost |
| RoHS and halogen-free (IEC 61249-2-21) | Meets global environmental compliance requirements for consumer, telecom, and industrial end equipment |
| Low CJ (10 pF) | Reduces high-frequency displacement current, improving EMI margin in EMI-critical power supplies |
| 150°C max junction temperature | Supports operation in sealed enclosures or high-ambient environments without derating below 2 A |
Applications
| AC-DC Adapter Power Supply | Industrial DC-DC Converter |
|---|---|
Use Scenario: 24 V/2 A isolated output in wall-plug adapter for IoT gateway. IC Role / Device Role / Timing Role: Output rectifier in discontinuous conduction mode (DCM) flyback converter. Use Value: 800 V rating provides 2× safety margin over reflected 400 VPK; 250 ns trr limits switching loss to <150 mW at 250 kHz. | Use Scenario: 48 V/2 A auxiliary supply in programmable logic controller (PLC) backplane. IC Role / Device Role / Timing Role: Secondary-side freewheeling diode in synchronous buck-derived isolated converter. Use Value: 10 pF CJ prevents coupling of 500 kHz gate drive noise into analog sensing circuits. |
| Solar Microinverter DC Link | LED Driver Secondary Rectification |
Use Scenario: DC link rectification in 250 W microinverter with 600 V bus. IC Role / Device Role / Timing Role: Boost-stage output rectifier handling bidirectional current transients. Use Value: 100 µA IR at 125°C maintains efficiency >94% at elevated ambient temperatures near PV panels. | Use Scenario: Constant-current LED driver with 36 V output for commercial lighting. IC Role / Device Role / Timing Role: Output rectifier in quasi-resonant (QR) flyback topology. Use Value: 1.14 V VF at 2 A yields only 2.3 W conduction loss - avoids heatsink requirement in slim-profile fixtures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fast recovery rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH2R08 | Same IF (2 A), VRRM = 800 V, but trr = 75 ns; TO-220AC package | Requires through-hole mounting and heatsink for same thermal performance | Prefer when ultra-fast recovery (<100 ns) is required and board space allows larger footprint |
| ES2J | Same SMA package, IF = 2 A, VRRM = 600 V, trr = 35 ns, VF = 1.7 V @ 2 A | Limited to ≤420 VDC systems; higher conduction loss offsets faster recovery | Select only if system VRRM margin permits 600 V rating and layout cannot accommodate 800 V part |
Compared with STTH2R08 and ES2J, the RS2KAF-T delivers optimal balance of 800 V robustness, 250 ns recovery, and SMAF surface-mount compatibility - enabling compact, reflow-soldered designs without thermal derating penalties.
Availability
RS2KAF-T is available at Aetrix Electronics and suitable for AC-DC adapters, industrial DC-DC converters, solar microinverters, and LED drivers requiring stable component supply across extended production lifecycles.
Supply support for RS2KAF-T 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 RS2x series was designed specifically for high-reliability, high-frequency switching power supplies - emphasizing fast recovery, low leakage, and robust packaging for automated SMT assembly in volume production.
FAQ
What is the maximum junction temperature rating for RS2KAF-T?
The RS2KAF-T has a maximum junction temperature (TJ) of +150°C, verified per absolute maximum ratings table in the official Taiwan Semiconductor datasheet Version B2103. This rating applies across the full operating current range and supports reliable operation in enclosed or high-ambient environments when mounted on a 5 mm × 5 mm Cu pad. The RS2KAF-T must not exceed this limit to maintain specified electrical performance and lifetime.
Does RS2KAF-T meet RoHS and halogen-free requirements?
Yes, the RS2KAF-T is RoHS compliant and halogen-free per IEC 61249-2-21, as explicitly stated in the "Features" section of the Taiwan Semiconductor datasheet. These compliance attributes are confirmed for the SMAF package variant and apply to all units shipped under ordering code RS2KAF-T. No exemptions or deviations are noted in the official documentation.
What is the reverse recovery time (trr) of RS2KAF-T and under what test conditions?
The RS2KAF-T has a reverse recovery time (trr) of 250 ns, measured under conditions of IF = 0.5 A, IR = 1.0 A, and IRR = 0.25 A, per the Electrical Specifications table in the Taiwan Semiconductor datasheet. This value applies specifically to the RS2KAF-T variant and is consistent across the RS2JAF-T through RS2MAF-T group due to shared die construction and process.
Is RS2KAF-T suitable for reflow soldering, and what is its moisture sensitivity level?
Yes, the RS2KAF-T is qualified for standard lead-free reflow soldering and carries J-STD-020 Moisture Sensitivity Level 1 - meaning it can be stored indefinitely at ≤30°C/85% RH and placed directly onto the SMT line without baking or dry-pack handling. This is confirmed in the "Features" list and Mechanical Data section of the official datasheet.
What is the forward voltage drop of RS2KAF-T at 2 A and 125°C?
The RS2KAF-T exhibits a typical forward voltage (VF) of 0.98 V at IF = 2 A and TJ = 125°C, with a maximum of 1.23 V under the same conditions, as specified in the Electrical Specifications table. This value reflects reduced voltage drop at elevated temperature due to silicon's negative temperature coefficient, and is critical for thermal stability analysis in high-ambient designs.
RS2KAF-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- DO-221AC, SMA Flat Leads
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 800 V
- Current - Average Rectified (Io):
- 2A
- Voltage - Forward (Vf) (Max) @ If:
- 1.3 V @ 2 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 250 ns
- Current - Reverse Leakage @ Vr:
- 5 µA @ 800 V
- Capacitance @ Vr, F:
- 10pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMAF
- Operating Temperature - Junction:
- -55°C ~ 150°C
RS2KAF-T FAQ
1.How can I place an order for RS2KAF-T through Aetrix?
Please submit a Request for Quotation (RFQ) for RS2KAF-T 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 RS2KAF-T reliable?
The price and inventory of RS2KAF-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RS2KAF-T is usually 5 days.
3.What payment methods are accepted for RS2KAF-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RS2KAF-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RS2KAF-T?
RS2KAF-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RS2KAF-T 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 RS2KAF-T?
For technical support, including RS2KAF-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RS2KAF-T requirements.
6.How does Aetrix verify that RS2KAF-T is sourced from the original manufacturer or authorized distributors?
All RS2KAF-T 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 RS2KAF-T meets industry standards.
7.What is the process for return or replacement of RS2KAF-T?
All RS2KAF-T units undergo pre-shipment inspection (PSI). If there is an issue with RS2KAF-T, 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 RS2KAF-T part is unused and in its original packaging.
Return procedure for RS2KAF-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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