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Taiwan Semiconductor Corporation S2KAF-T
- Part No.:
- S2KAF-T
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
S2KAF-T.pdf
- Description:
- 2A, 800V, STANDARD RECOVERY RECT
- Quantity:
- Payment:
- Shipping:
Inventory:7,500
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Product details
Overview
S2KAF-T from Taiwan Semiconductor is a 2 A, 800 V standard surface-mount silicon rectifier diode in SMAF package, featuring glass-passivated junction, low reverse leakage (≤5 µA at 25°C), and 150°C max junction temperature - used in DC-DC converters and switching-mode inverters.
For engineers reviewing the S2KAF-T datasheet, S2KAF-T pinout, S2KAF-T application, or S2KAF-T equivalent, key selection criteria include repetitive peak reverse voltage (800 V), forward voltage (0.95 V max at 2 A/25°C), thermal resistance (RθJL = 15 °C/W), and RoHS/halogen-free compliance for industrial power conversion designs.
Technical Context
This single-die standard recovery rectifier operates with a 2 A average forward current and withstands 50 A non-repetitive surge (8.3 ms half-sine). Its 800 V VRRM rating targets mid-voltage switching power supplies where cost-effective, robust AC/DC front-end or output rectification is required.
Thermal performance is characterized on a 5 mm × 5 mm copper pad PCB: RθJA = 89 °C/W, RθJC = 22 °C/W, enabling reliable operation up to 150°C junction temperature under continuous load with appropriate board-level heatsinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 800 V - supports input rectification in 400–600 VAC systems after bridge configuration |
| IF | 2 A continuous - suitable for medium-power DC-DC outputs up to ~40 W at 20 V |
| IFSM (8.3 ms) | 50 A - handles inrush and transient overloads without failure in SMPS startup |
| VF @ 2 A / 25°C | 0.95 V max - contributes ≤1.9 W conduction loss per diode at full load |
| RθJL | 15 °C/W - enables direct thermal coupling to PCB copper for passive cooling |
| IR @ 800 V / 25°C | 5 µA max - ensures minimal standby power loss in high-impedance bias networks |
| Junction Temp Range | −55°C to +150°C - qualified for extended industrial ambient environments |
Pinout & Package
Package: SMAF (Surface-Mount Axial Flat) - molded plastic case with matte tin-plated leads, UL 94V-0 rated, polarity indicated by cathode band, weight ≈ 0.035 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry | Connected to lower-potential side of rectifier string; requires adequate trace width for 2 A RMS |
| Cathode | Forward current exit / polarity indicator | Marked with band; ties to output rail or switching node; critical for layout orientation |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Enhances long-term reliability under humidity and thermal cycling vs. epoxy-passivated alternatives |
| Moisture sensitivity level 1 | Enables direct placement without baking - reduces manufacturing overhead and floor-life risk |
| RoHS & halogen-free | Meets IEC 61249-2-21 and global environmental compliance mandates for industrial shipments |
| Low RθJL (15 °C/W) | Permits higher power density by transferring heat efficiently to PCB copper, avoiding external heatsinks |
Applications
| DC-DC Converter Output Rectification | Switching Inverter Freewheeling Diode |
|---|---|
Use Scenario: Secondary-side synchronous or non-synchronous rectification in isolated flyback or forward converters delivering 12–48 V at ≤2 A. IC Role / Device Role / Timing Role: Unidirectional current valve converting transformer AC output to regulated DC; conducts during switch-off phase. Use Value: 0.95 V VF limits conduction loss to <2 W; 800 V VRRM accommodates reflected voltage spikes in 24 V systems. | Use Scenario: Freewheeling path for inductive loads (e.g., motor windings, solenoids) in half-bridge or H-bridge inverters. IC Role / Device Role / Timing Role: Provides low-loss return path for stored inductive energy when main switches turn off. Use Value: 50 A IFSM safely clamps short-duration back-EMF transients; 150°C TJMAX sustains operation during burst-mode motor control. |
| AC-DC Adapter Input Bridge Leg | Industrial Power Supply Snubber Clamp |
Use Scenario: One leg of a compact, surface-mount full-wave bridge rectifier in universal-input (90–264 VAC) offline adapters. IC Role / Device Role / Timing Role: Conducts during positive half-cycle of AC input; blocks reverse voltage during negative half-cycle. Use Value: 800 V VRRM exceeds peak line voltage (375 V) with >2× margin; SMAF footprint saves board space vs. DO-214AA. | Use Scenario: Clamping diode in RCD snubber networks across MOSFETs or IGBTs in 400 V bus industrial drives. IC Role / Device Role / Timing Role: Absorbs turn-off voltage spikes by conducting only above clamp threshold, then recovers. Use Value: Low 5 µA IR minimizes leakage current in high-impedance snubber resistors; fast recovery not required but sufficient for <100 kHz operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar standard rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH2R08 | Same IF (2 A), same VRRM (800 V), but TO-220AC package (through-hole); RθJA ≈ 50 °C/W | Requires through-hole assembly and larger board area; better for higher ambient temp with heatsink | Choose STTH2R08 if mechanical mounting or legacy through-hole compatibility is mandatory |
| ES2J | Same SMA package, same VRRM (600 V), but lower VRRM; VF ≈ 0.98 V @ 2 A | Not suitable for 800 V systems; acceptable only in ≤600 V designs with tighter cost constraints | Choose ES2J only when 600 V rating suffices and footprint compatibility is prioritized over voltage margin |
Compared with STTH2R08 and ES2J, the S2KAF-T delivers optimal balance of surface-mount manufacturability, 800 V robustness, and thermal performance on standard PCBs - making it preferred for space-constrained, automated industrial power modules where voltage margin and reflow compatibility are critical.
Availability
S2KAF-T is available at Aetrix Electronics and suitable for DC-DC converters, switching inverters, and industrial AC-DC adapters requiring stable component supply and RoHS-compliant rectification.
Supply support for S2KAF-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 S2KAF-T belongs to TSC's S2xAF-T family of standard recovery rectifiers - engineered for cost-sensitive, high-volume power conversion applications demanding reliability, automated assembly readiness, and consistent parametric performance across voltage grades.
FAQ
What is the maximum repetitive peak reverse voltage rating for S2KAF-T?
The S2KAF-T has a specified VRRM of 800 V, verified per Taiwan Semiconductor's B2103 datasheet revision. This rating allows safe operation in circuits where peak reverse voltage does not exceed 800 V under repetitive conditions, including line-voltage surges and transformer-reflected transients. Designers must ensure derating margins per application safety standards.
Does S2KAF-T support lead-free reflow soldering?
Yes, the S2KAF-T features matte tin-plated leads compliant with J-STD-002 solderability requirements and is rated for lead-free reflow profiles. Its moisture sensitivity level is Class 1 per J-STD-020, eliminating bake requirements prior to assembly - enabling direct use in standard SMT lines without process modification.
What is the forward voltage drop of S2KAF-T at full rated current?
At IF = 2 A and TJ = 25°C, the S2KAF-T exhibits a maximum forward voltage (VF) of 1.10 V, with typical value 0.95 V. At elevated junction temperature (125°C), VF drops to 0.96 V max, reducing conduction loss in thermally stressed operation - a key behavior confirmed in the electrical specifications table of the official datasheet.
Is S2KAF-T halogen-free and RoHS compliant?
Yes, the S2KAF-T meets RoHS Directive 2011/65/EU and is halogen-free per IEC 61249-2-21. These compliance attributes are explicitly stated in the FEATURES section of the Taiwan Semiconductor datasheet (Version B2103) and apply to the S2KAF-T variant within the S2xAF-T series.
What is the thermal resistance from junction to lead (RθJL) for S2KAF-T?
The S2KAF-T has a typical junction-to-lead thermal resistance (RθJL) of 15 °C/W, measured under standard test conditions (PCB with 5 mm × 5 mm Cu pad). This low value enables efficient heat transfer from the die directly into the PCB copper, supporting higher power density without auxiliary heatsinking in well-designed layouts.
S2KAF-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):
- 200 V
- Current - Average Rectified (Io):
- 2A
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 2 A
- Speed:
- Standard Recovery >500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 5 µA @ 800 V
- Capacitance @ Vr, F:
- 11pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMAF
- Operating Temperature - Junction:
- -55°C ~ 150°C
S2KAF-T FAQ
1.How can I place an order for S2KAF-T through Aetrix?
Please submit a Request for Quotation (RFQ) for S2KAF-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 S2KAF-T reliable?
The price and inventory of S2KAF-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for S2KAF-T is usually 5 days.
3.What payment methods are accepted for S2KAF-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for S2KAF-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for S2KAF-T?
S2KAF-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your S2KAF-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 S2KAF-T?
For technical support, including S2KAF-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your S2KAF-T requirements.
6.How does Aetrix verify that S2KAF-T is sourced from the original manufacturer or authorized distributors?
All S2KAF-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 S2KAF-T meets industry standards.
7.What is the process for return or replacement of S2KAF-T?
All S2KAF-T units undergo pre-shipment inspection (PSI). If there is an issue with S2KAF-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 S2KAF-T part is unused and in its original packaging.
Return procedure for S2KAF-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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