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Taiwan Semiconductor Corporation S1KLW
- Part No.:
- S1KLW
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- SOD-123W
- Datasheet:
-
S1KLW.pdf
- Description:
- DIODE GEN PURP 800V 1A SOD123W
- Quantity:
- Payment:
- Shipping:
Inventory:2,694
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Product details
Overview
S1KLW from Taiwan Semiconductor is a 1 A, 800 V repetitive peak reverse voltage surface-mount standard rectifier diode in SOD-123W package, featuring 30 A non-repetitive surge current capability, 1.1 V max forward voltage at 1 A, and 1 µA max reverse leakage at 25°C - used in DC-DC converters and switching-mode power supplies.
For engineers reviewing the S1KLW datasheet, S1KLW pinout, S1KLW application, or S1KLW equivalent, key selection criteria include VRRM=800 V, IFSM=30 A, VF≤1.1 V @ 1 A, TJ(max)=175°C, and SOD-123W thermal resistance (RθJA=80°C/W), critical for high-efficiency, space-constrained power conversion designs.
Technical Context
The S1KLW is a single-die, silicon planar junction standard rectifier optimized for medium-voltage, medium-current switching applications. It operates with a maximum junction temperature of 175°C and exhibits low capacitance (CJ=8 pF @ 1 MHz, VR=4 V), supporting fast transient response in high-frequency converters.
Its SOD-123W package delivers enhanced thermal performance over standard SOD-123 (RθJL=25°C/W), while maintaining JEDEC-compliant lead finish and J-STD-020 Level 1 moisture sensitivity - enabling robust reflow compatibility without baking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 800 V - supports input stages up to 560 V RMS in offline SMPS designs |
| IF | 1 A continuous - suitable for output rectification in ≤15 W isolated flyback or buck-derived topologies |
| IFSM | 30 A (8.3 ms half-sine) - withstands startup surges and short-circuit transients without failure |
| VF | ≤1.1 V @ IF=1 A, TJ=25°C - limits conduction loss to ≤1.1 W per device at full load |
| IR | ≤1 µA @ VR=800 V, TJ=25°C - ensures minimal standby power loss in high-impedance bias networks |
| RθJA | 80°C/W - enables 1 A operation on 1-in² 1-oz copper with <50°C rise above ambient |
| CJ | 8 pF @ 1 MHz, VR=4 V - reduces high-frequency switching noise coupling in gate-drive or feedback paths |
Pinout & Package
Package: SOD-123W - molded plastic case with matte tin-plated leads, UL 94V-0 rated compound, cathode indicated by band, weight ≈0.019 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 switch node return) |
| Cathode | Current exit point during forward conduction; marked by band | Connected to output rail or filter capacitor positive terminal; polarity must be observed for rectification |
Key Features
| Feature | Design Value |
|---|---|
| High surge current rating (IFSM = 30 A) | Enables reliable operation under repeated line surges or output short-circuit events without bond-wire fusing |
| Low forward voltage (VF ≤ 1.1 V) | Reduces conduction losses by ~15% vs. comparable 1 A/800 V rectifiers with VF ≥ 1.25 V |
| Junction-to-lead thermal resistance (RθJL = 25°C/W) | Allows direct heat transfer to PCB copper pour or thermal pad, improving long-term reliability at elevated ambient |
| Moisture sensitivity level 1 (J-STD-020) | Eliminates pre-bake requirement before reflow, reducing manufacturing cycle time and cost |
| Halogen-free & RoHS compliant | Meets IPC-1752A material declaration requirements for industrial and consumer end-equipment |
Applications
| AC-DC Adapter Output Rectification | Isolated Flyback Secondary Side |
|---|---|
Use Scenario: 12 V/1 A output stage in universal-input (90–264 VAC) wall adapters for IoT sensors and smart home devices. IC Role / Device Role / Timing Role: Standard rectifier converting transformer secondary AC to regulated DC; placed directly after secondary winding. Use Value: 800 V VRRM provides 2× safety margin over reflected 400 V peak, while 1.1 V VF keeps efficiency >85% at full load. | Use Scenario: Output rectification in 5 V/0.8 A flyback converter powering microcontroller-based industrial controllers. IC Role / Device Role / Timing Role: Uncontrolled rectifier conducting only during transformer reset phase; no timing or control function. Use Value: 30 A IFSM tolerates 10× overload during cold-start into large bulk capacitors without degradation. |
| DC-DC Buck-Derived Supply | Switching Inverter Auxiliary Rail |
Use Scenario: 3.3 V/0.5 A post-regulated rail derived from a 12 V intermediate bus using discrete buck + synchronous rectification. IC Role / Device Role / Timing Role: Freewheeling diode in asynchronous buck topology; conducts during low-side switch off-time. Use Value: 8 pF junction capacitance minimizes reverse recovery ringing, easing EMI filter design. | Use Scenario: 15 V auxiliary supply for gate drivers and logic in 400 V DC-link inverters used in HVAC compressors. IC Role / Device Role / Timing Role: Input rectifier feeding unregulated DC bus for isolated DC-DC modules powering driver ICs. Use Value: 175°C TJ(max) allows operation in sealed enclosures with ambient up to 105°C without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar standard rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MUR108 | VRRM=800 V, IF=1 A, VF=1.25 V typ @ 1 A, RθJA=75°C/W, DO-214AC package | Larger footprint (DO-214AC vs. SOD-123W); higher VF increases conduction loss by ~140 mW at 1 A | Prefer S1KLW for space-constrained layouts; choose MUR108 only if legacy board uses DO-214AC pads |
| Vishay VS-1N4937GP-E3/54 | VRRM=800 V, IF=1 A, VF=1.05 V max @ 1 A, SOD-123 package (not SOD-123W), RθJA=100°C/W | Same pin count but smaller SOD-123 body; lower VF but worse thermal resistance limits sustained 1 A operation | S1KLW preferred for thermally demanding environments; VS-1N4937GP-E3/54 acceptable only with forced airflow or reduced duty cycle |
Compared with MUR108 and VS-1N4937GP-E3/54, the S1KLW uniquely balances compact SOD-123W packaging, competitive VF, and superior thermal resistance - making it optimal for high-density, convection-cooled 1 A rectification where board area and thermal headroom are constrained.
Availability
S1KLW is available at Aetrix Electronics and suitable for DC-DC converters, switching-mode inverters, and general-purpose power rectification requiring stable component supply across industrial, consumer, and embedded OEM programs.
Supply support for S1KLW 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 S1KLW belongs to TSC's S1xLW family of standard rectifiers - engineered specifically for cost-sensitive, high-volume AC-DC and DC-DC power conversion where reliability, thermal performance, and automated assembly compatibility are prioritized.
FAQ
What is the maximum repetitive peak reverse voltage (VRRM) rating for the S1KLW?
The S1KLW has a VRRM rating of 800 V, verified in the official Taiwan Semiconductor datasheet revision D2109. This value is fixed for the S1KLW variant and distinguishes it from other members of the S1xLW series (e.g., S1DLW = 200 V, S1MLW = 1000 V). Designers must ensure this rating exceeds the peak reverse voltage seen in circuit operation by at least 20% for reliability.
Does the S1KLW have a specified forward voltage (VF) at 1 A and 25°C?
Yes, the S1KLW specifies a maximum forward voltage of 1.1 V at IF = 1 A and TJ = 25°C, per the Electrical Specifications table in the Taiwan Semiconductor datasheet. This is a guaranteed upper limit under pulse test conditions (PW = 0.3 ms), not a typical value. The actual VF of a given S1KLW unit may be lower but will not exceed 1.1 V under those conditions.
What package type does the S1KLW use, and how does it differ from standard SOD-123?
The S1KLW uses the SOD-123W package - a widened-body variant of SOD-123 with improved thermal performance. Per the Mechanical Data section, SOD-123W features larger copper exposure and lower RθJA (80°C/W vs. ~120°C/W for standard SOD-123), enabling higher power dissipation in the same PCB footprint. The marking code "1KLW" is laser-etched on the cathode-banded side.
Is the S1KLW suitable for use in automotive applications?
The S1KLW is not qualified to AEC-Q101 or automotive-grade reliability standards. While its TJ(max) = 175°C and operating range (−55°C to +175°C) meet some environmental requirements, Taiwan Semiconductor explicitly states in the Notice section that these products are "not designed for use in medical, life-saving, or life-sustaining applications." Automotive use requires formal qualification and PPAP documentation not provided for the S1KLW.
What is the reverse leakage current (IR) specification for the S1KLW at 125°C?
At TJ = 125°C and VR = rated VRRM (800 V), the S1KLW specifies a maximum reverse leakage current of 50 µA, per the Electrical Specifications table. This value is measured under 30 ms pulse conditions and reflects worst-case behavior at elevated temperature. At room temperature (25°C), IR is limited to 1 µA maximum under the same voltage stress.
S1KLW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- SOD-123W
- 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:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123W
- Operating Temperature - Junction:
- -55°C ~ 175°C
S1KLW FAQ
1.How can I place an order for S1KLW through Aetrix?
Please submit a Request for Quotation (RFQ) for S1KLW 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 S1KLW reliable?
The price and inventory of S1KLW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for S1KLW is usually 5 days.
3.What payment methods are accepted for S1KLW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for S1KLW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for S1KLW?
S1KLW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your S1KLW 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 S1KLW?
For technical support, including S1KLW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your S1KLW requirements.
6.How does Aetrix verify that S1KLW is sourced from the original manufacturer or authorized distributors?
All S1KLW 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 S1KLW meets industry standards.
7.What is the process for return or replacement of S1KLW?
All S1KLW units undergo pre-shipment inspection (PSI). If there is an issue with S1KLW, 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 S1KLW part is unused and in its original packaging.
Return procedure for S1KLW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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