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Taiwan Semiconductor Corporation S1KAL
- Part No.:
- S1KAL
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
S1KAL.pdf
- Description:
- DIODE GEN PURP 800V 1A THIN SMA
- Quantity:
- Payment:
- Shipping:
Inventory:7,000
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Product details
Overview
S1KAL from Taiwan Semiconductor is a 1A, 800V repetitive peak reverse voltage standard surface-mount silicon rectifier diode in a Thin SMA package, featuring glass-passivated junction, 30A surge capability (8.3ms), and 150°C max junction temperature-used in DC-DC converters and switching-mode inverters.
For engineers reviewing the S1KAL datasheet, S1KAL pinout, S1KAL application, or S1KAL equivalent, key selection criteria include its 800V VRRM, low forward voltage (0.96V @ 1A/25°C), thermal resistance (RθJL = 29°C/W), moisture sensitivity level 1 compliance, and RoHS/halogen-free qualification.
Technical Context
The S1KAL is a single-die, unidirectional standard recovery rectifier optimized for high-voltage, medium-current switching power supplies. Its glass-passivated junction ensures stable reverse leakage (<1 µA @ 25°C) and robustness against humidity and thermal cycling.
Thermal performance is characterized with RθJA = 82°C/W on a 5mm × 5mm Cu pad PCB, supporting continuous 1A conduction up to 125°C ambient when derated per Fig.1. Junction capacitance is 8 pF at 1 MHz / 4V, minimizing high-frequency switching noise.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 800 V - Maximum repetitive reverse blocking voltage; defines safe operating limit in flyback or boost topologies |
| IF | 1 A - Continuous average forward current rating at TA = 25°C; derates linearly above 25°C |
| IFSM (8.3ms) | 30 A - Non-repetitive surge current handling; supports inrush and fault transient immunity |
| VF @ 1A/25°C | 0.96 V (max) - Forward drop directly impacts conduction loss and thermal design in SMPS output stages |
| RθJL | 29 °C/W - Junction-to-lead thermal resistance; enables direct heatsinking via PCB copper pour |
| IR @ 800V/25°C | ≤1 µA - Low reverse leakage preserves efficiency in high-impedance bias networks |
| CJ | 8 pF - Junction capacitance at 1 MHz/4V; affects EMI and snubber sizing in high-frequency converters |
Pinout & Package
Package: Thin SMA (Surface Mount Axial), molded in UL 94V-0 compound, with pure tin-plated leads and cathode band polarity marking. Weight: 0.029 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential side of circuit (e.g., transformer secondary center-tap or switch node) |
| Cathode | Forward current exit point | Marked by band; connects to output capacitor or load return; carries full output current |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enables stable long-term reliability under humid conditions and repeated thermal stress without encapsulation degradation |
| Moisture sensitivity level 1 | Eliminates bake requirement prior to reflow; compatible with standard SMT assembly lines without special handling |
| Low profile Thin SMA package | Height ≤1.1 mm enables compact board stacking and fits tight clearance constraints in slim power adapters |
| RoHS and halogen-free compliance | Meets IEC 61249-2-21 and EU RoHS directives; supports environmentally regulated industrial and consumer shipments |
| J-STD-002 solderability & JESD 201 Class 2 whisker resistance | Ensures consistent wetting during lead-free reflow and prevents tin whisker growth in long-life applications |
Applications
| DC–DC Converter Output Rectification | Switching Inverter Freewheeling Diode |
|---|---|
Use Scenario: Used as secondary-side rectifier in isolated 12V/24V DC–DC modules delivering up to 1A load current. IC Role / Device Role / Timing Role: Unidirectional current valve converting transformer AC output to regulated DC; operates in discontinuous conduction mode. Use Value: 0.96V VF minimizes conduction loss; 800V VRRM provides margin against reflected voltage spikes in flyback designs. | Use Scenario: Placed across inductive motor windings in 24V–48V brushless DC inverters for energy recirculation. IC Role / Device Role / Timing Role: Freewheeling path during MOSFET off-time; clamps inductive kickback and reduces switching losses. Use Value: 30A IFSM withstands motor startup surges; 150°C TJMAX supports operation in sealed enclosures with limited airflow. |
| AC–DC Adapter Secondary Rectifier | Industrial Sensor Power Supply Clamp |
Use Scenario: Rectifies 12V AC from toroidal transformer in wall-mounted AC–DC adapters rated ≤12W. IC Role / Device Role / Timing Role: Full-wave or half-wave rectifier feeding bulk capacitor; conducts only during positive half-cycles. Use Value: Low-profile Thin SMA fits height-constrained plastic housings; moisture level 1 avoids pre-bake delays in high-volume manufacturing. | Use Scenario: Protects 3.3V/5V sensor supply rails from transient overvoltage induced by nearby relay switching. IC Role / Device Role / Timing Role: Reverse-biased clamp limiting negative excursions; conducts only during fault events. Use Value: ≤1 µA IR at 25°C prevents loading of precision reference circuits; 800V rating covers worst-case inductive coupling in factory environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar standard rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH1R08 | Same 1A/800V rating; faster recovery time (~75ns vs. ~2µs), higher VF (1.15V typ) | Better suited for high-frequency PFC stages; less optimal for low-loss output rectification | Prefer S1KAL where low VF and cost matter more than speed; STTH1R08 where EMI reduction is critical |
| SB180 | Same Thin SMA package; lower VRRM (80V), higher IF (1A), Schottky construction | Only suitable for low-voltage DC–DC; cannot replace S1KAL in 800V systems | Not interchangeable-SB180 lacks required voltage rating; use only in sub-100V applications requiring ultra-low VF |
Compared with STTH1R08 and SB180, the S1KAL delivers optimal balance of voltage rating, conduction loss, and manufacturability for 800V-class medium-power rectification-without requiring layout changes or thermal redesign when substituting within its family (S1DAL–S1MAL).
Availability
S1KAL is available at Aetrix Electronics and suitable for DC–DC converters, switching inverters, and industrial sensor power supplies requiring stable component supply, RoHS-compliant sourcing, and J-STD-020 Level 1 assembly readiness.
Supply support for S1KAL 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 global power, automotive, and industrial markets since 1979.
The S1KAL belongs to TSC's S1xAL standard rectifier family, engineered for cost-sensitive, high-volume power conversion applications where reliability, thermal stability, and SMT compatibility are prioritized over ultrafast switching.
FAQ
What is the maximum repetitive peak reverse voltage (VRRM) for the S1KAL?
The S1KAL has a specified VRRM of 800 V, meaning it can reliably block up to 800 volts of reverse voltage in repetitive operation. This rating is confirmed in the Absolute Maximum Ratings table on page 2 of the official Taiwan Semiconductor datasheet (Version B2103). Exceeding this voltage risks avalanche breakdown and permanent device failure. The S1KAL is part of a family spanning 200V to 1000V, with S1KAL specifically designated for the 800V grade.
Does the S1KAL require moisture preconditioning before reflow soldering?
No, the S1KAL does not require moisture preconditioning. It is rated at Moisture Sensitivity Level (MSL) 1 per J-STD-020, which means it can be stored indefinitely at ambient conditions and placed directly into reflow without baking. This simplifies SMT line integration and eliminates yield risk from moisture-induced popcorning. The S1KAL's glass passivation and UL 94V-0 molding compound contribute to this robust MSL 1 classification.
What is the forward voltage (VF) of the S1KAL at 1A and 25°C?
The S1KAL exhibits a maximum forward voltage of 1.10 V at 1A and 25°C, with a typical value of 0.96 V under the same conditions. This is measured per the Electrical Specifications table (page 2 of datasheet B2103) using pulse testing (PW = 0.3 ms). At elevated junction temperatures (125°C), VF drops to 0.98 V (max), improving conduction efficiency in thermally stressed designs. The S1KAL's low VF directly reduces power loss in output rectification stages.
Is the S1KAL RoHS and halogen-free compliant?
Yes, the S1KAL is fully RoHS compliant and halogen-free per IEC 61249-2-21. This is explicitly stated in the FEATURES section of the Taiwan Semiconductor datasheet (Version B2103). Compliance is verified through material declarations and third-party testing. The S1KAL's pure tin-plated leads and halogen-free molding compound make it suitable for export to EU, China, and other regulated markets requiring strict environmental substance controls.
What is the thermal resistance from junction to ambient (RθJA) for the S1KAL?
The S1KAL has a junction-to-ambient thermal resistance (RθJA) of 82°C/W when mounted on a standard 5 mm × 5 mm copper pad test board, as specified in the Thermal Performance table (page 2 of datasheet B2103). This value assumes natural convection cooling and is used to estimate junction temperature rise under steady-state load. For improved thermal performance, designers may increase copper area or add thermal vias-RθJL is 29°C/W, indicating efficient heat transfer to the PCB leads.
S1KAL 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):
- 1A
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 1 A
- Speed:
- Standard Recovery >500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 1 µA @ 800 V
- Capacitance @ Vr, F:
- 8pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- Thin SMA
- Operating Temperature - Junction:
- -55°C ~ 150°C
S1KAL FAQ
1.How can I place an order for S1KAL through Aetrix?
Please submit a Request for Quotation (RFQ) for S1KAL 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 S1KAL reliable?
The price and inventory of S1KAL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for S1KAL is usually 5 days.
3.What payment methods are accepted for S1KAL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for S1KAL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for S1KAL?
S1KAL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your S1KAL 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 S1KAL?
For technical support, including S1KAL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your S1KAL requirements.
6.How does Aetrix verify that S1KAL is sourced from the original manufacturer or authorized distributors?
All S1KAL 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 S1KAL meets industry standards.
7.What is the process for return or replacement of S1KAL?
All S1KAL units undergo pre-shipment inspection (PSI). If there is an issue with S1KAL, 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 S1KAL part is unused and in its original packaging.
Return procedure for S1KAL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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