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Taiwan Semiconductor Corporation HS2KAF-T
- Part No.:
- HS2KAF-T
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
HS2KAF-T.pdf
- Description:
- 75NS, 2A, 800V, HIGH EFFICIENT R
- Quantity:
- Payment:
- Shipping:
Inventory:7,500
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Product details
Overview
HS2KAF-T from Taiwan Semiconductor is a 2 A, 800 V high-efficiency surface-mount silicon rectifier diode in SMAF package, featuring low forward voltage (1.33 V at 2 A, 25°C), 75 ns reverse recovery time, and 12 pF junction capacitance - optimized for switching-mode power supplies and freewheeling paths in DC-DC converters.
For engineers reviewing the HS2KAF-T datasheet, HS2KAF-T pinout, HS2KAF-T application, or HS2KAF-T equivalent, key selection criteria include peak reverse voltage rating, thermal resistance (RθJL = 15°C/W), TJ max (150°C), and RoHS/halogen-free compliance for industrial-grade power conversion designs.
Technical Context
This single-die, glass-passivated PN junction rectifier operates with a maximum junction temperature of 150°C and supports surge currents up to 50 A (8.3 ms) or 130 A (1.0 ms). Its low leakage (<5 µA at 25°C, <250 µA at 125°C) and fast trr (75 ns) enable high-frequency switching efficiency in compact layouts.
The SMAF package provides JESD201 Class 1 whisker resistance, matte tin-plated leads, and UL 94V-0 molding compound - ensuring reliability under automated SMT assembly and sustained thermal cycling in power electronics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 800 V - supports input rectification in 400–600 VAC SMPS front-ends without derating |
| IF | 2 A continuous - delivers rated output current in 25 mm² PCB copper pad thermal layout |
| VF @ 2A, 25°C | 1.33 V typical - reduces conduction loss by ~18% vs. standard FR107 in same footprint |
| trr | 75 ns - enables operation up to ~500 kHz switching frequency with minimal switching loss |
| CJ | 12 pF @ 1 MHz, 4 V - limits capacitive coupling noise in high-dv/dt gate-drive or snubber circuits |
| RθJL | 15 °C/W - allows direct thermal path to PCB copper, supporting >1.5 W dissipation at ΔT = 22.5°C |
| IFSM (8.3 ms) | 50 A - withstands inrush surges in offline AC-DC adapters during cold start |
Pinout & Package
Package: SMAF - surface-mount, single-anode/single-cathode configuration with cathode band marking; 0.035 g weight; moisture sensitivity level 1 (J-STD-020).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential side (e.g., switch node in buck freewheel path) |
| Cathode | Forward current exit / reverse blocking terminal | Marked by visible band; ties to output rail or positive bus in rectifier configuration |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Enables stable long-term reverse leakage performance under humidity and bias stress |
| Low RθJL (15°C/W) | Permits direct heat transfer to PCB without heatsink in ≤2 W applications |
| RoHS + halogen-free | Meets IEC 61249-2-21 and global environmental compliance for industrial shipments |
| J-STD-002 solderability | Guarantees reliable reflow wetting on OSP- or ENIG-finished PCBs |
| Single half-sine IFSM rating | Validates robustness against line-voltage transients in unregulated AC inputs |
Applications
| DC-DC Converter Secondary Rectification | Switching Inverter Freewheel Diode |
|---|---|
Use Scenario: High-frequency synchronous rectifier replacement in isolated flyback or forward converters delivering 12–48 V outputs. IC Role / Device Role / Timing Role: Unidirectional current valve clamping transformer reset energy and conducting load current during low-side switch off-time. Use Value: 1.33 V VF minimizes conduction loss at 2 A, improving full-load efficiency by ≥0.8% over legacy 1N5822 equivalents. | Use Scenario: Bidirectional energy recirculation path in H-bridge motor inverters driving inductive loads. IC Role / Device Role / Timing Role: Freewheeling diode providing low-impedance return path when PWM switches turn off abruptly. Use Value: 75 ns trr prevents reverse recovery shoot-through in 20–100 kHz PWM, reducing EMI and MOSFET stress. |
| AC-DC Adapter Input Bridge Leg | Industrial Power Supply Snubber Clamp |
Use Scenario: One leg of compact 2A-rated bridge rectifier in universal-input (85–265 VAC) offline adapters. IC Role / Device Role / Timing Role: Half-wave rectifier converting AC line to pulsating DC prior to bulk capacitor filtering. Use Value: 800 V VRRM provides 2× safety margin over 400 VDC peak from 265 VAC, eliminating need for series stacking. | Use Scenario: Voltage-clamp diode across relay coils or solenoid drivers in PLC I/O modules. IC Role / Device Role / Timing Role: Transient energy absorber limiting inductive kickback to safe levels during coil de-energization. Use Value: 150°C TJMAX and 50 A IFSM ensure survival under repeated 100 V/100 ms spikes in harsh factory environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH2R08 | Same 2 A / 800 V rating; TO-220AC package; higher VF (1.7 V @ 2 A); RθJA = 65°C/W | Requires heatsink above 0.8 W; unsuitable for ultra-thin SMT-only designs | Prefer HS2KAF-T for space-constrained SMT layouts; STTH2R08 only where through-hole mounting and thermal mass are available |
| SB280 | SMA package (not SMAF); 2 A / 80 V rating; Schottky architecture; VF = 0.85 V; no reverse recovery | Cannot replace HS2KAF-T in 800 V systems; limited to ≤100 V DC-DC secondaries | Select SB280 only for low-VF requirement below 80 V; HS2KAF-T remains mandatory for 800 V blocking integrity |
Compared with STTH2R08 and SB280, HS2KAF-T uniquely combines 800 V capability, SMAF SMT compatibility, and 75 ns recovery in a 0.035 g package - enabling high-density, high-reliability rectification where voltage rating, size, and thermal performance are jointly constrained.
Availability
HS2KAF-T is available at Aetrix Electronics and suitable for DC-DC converter secondary rectification, switching inverter freewheeling, and industrial AC-DC adapter input stages requiring stable component supply and consistent parametric performance across production lots.
Supply support for HS2KAF-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, specializing in power rectifiers, TVS devices, and protection ICs since 1979.
The HS2KAF-T belongs to TSC's HS2xA F-series high-efficiency rectifier family, engineered specifically for high-frequency, high-reliability power conversion in industrial and computing power supplies where thermal density and voltage margin are critical.
FAQ
What is the maximum junction temperature rating for HS2KAF-T?
The HS2KAF-T has a maximum junction temperature (TJ) rating of +150°C, verified per absolute maximum ratings table in the official TSC datasheet Version B2103. This allows continuous operation in ambient temperatures up to +105°C when mounted on a 5 mm × 5 mm Cu pad, given its RθJL of 15°C/W. Derating curves confirm usable current down to 1.2 A at 125°C case temperature. The HS2KAF-T must not exceed this limit to maintain reliability and parametric stability.
Does HS2KAF-T have a specified reverse recovery time, and how is it measured?
Yes, HS2KAF-T specifies a typical reverse recovery time (trr) of 75 ns, measured under conditions of IF = 0.5 A, IR = 1.0 A, and Irr = 0.25 A, per the Electrical Specifications section of the TSC datasheet. This value applies to HS2JAF-T through HS2MAF-T variants and reflects performance at 25°C ambient. The HS2KAF-T's 75 ns trr supports efficient operation in switching frequencies up to 500 kHz without excessive switching loss or ringing.
Is HS2KAF-T RoHS compliant and halogen-free?
Yes, HS2KAF-T is RoHS compliant and halogen-free per IEC 61249-2-21, as explicitly stated in the FEATURES section of the TSC datasheet. The molding compound meets UL 94V-0 flammability rating, and terminals are matte tin plated per J-STD-002. These qualifications are confirmed for the HS2KAF-T variant and apply to all units shipped under ordering code HS2KAF-T. No exemptions or deviations are noted in Version B2103.
What is the forward voltage of HS2KAF-T at 2 A and 125°C?
The forward voltage (VF) of HS2KAF-T is 1.10 V (typical) and 1.31 V (maximum) at IF = 2 A and TJ = 125°C, per the Electrical Specifications table in the TSC datasheet. This elevated VF reflects reduced semiconductor resistivity at high temperature but remains within design margins for thermal-aware power stage calculations. The HS2KAF-T maintains stable conduction behavior across its full operating temperature range.
What does the "K" in HS2KAF-T signify?
The "K" in HS2KAF-T denotes the 800 V repetitive peak reverse voltage (VRRM) rating, per the Marking Code table in the TSC datasheet: HS2DAF-T = 200 V, HS2GAF-T = 400 V, HS2JAF-T = 600 V, HS2KAF-T = 800 V, HS2MAF-T = 1000 V. This letter-based coding is consistent across the HS2xA F-series and directly maps to the device's primary voltage classification. The HS2KAF-T is therefore the 800 V member of this family.
HS2KAF-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:
- 1.7 V @ 2 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 75 ns
- Current - Reverse Leakage @ Vr:
- 5 µA @ 800 V
- Capacitance @ Vr, F:
- 12pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMAF
- Operating Temperature - Junction:
- -55°C ~ 150°C
HS2KAF-T FAQ
1.How can I place an order for HS2KAF-T through Aetrix?
Please submit a Request for Quotation (RFQ) for HS2KAF-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 HS2KAF-T reliable?
The price and inventory of HS2KAF-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HS2KAF-T is usually 5 days.
3.What payment methods are accepted for HS2KAF-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HS2KAF-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HS2KAF-T?
HS2KAF-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HS2KAF-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 HS2KAF-T?
For technical support, including HS2KAF-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HS2KAF-T requirements.
6.How does Aetrix verify that HS2KAF-T is sourced from the original manufacturer or authorized distributors?
All HS2KAF-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 HS2KAF-T meets industry standards.
7.What is the process for return or replacement of HS2KAF-T?
All HS2KAF-T units undergo pre-shipment inspection (PSI). If there is an issue with HS2KAF-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 HS2KAF-T part is unused and in its original packaging.
Return procedure for HS2KAF-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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