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Home > Products > Discrete Semiconductor Products > Diodes > Rectifiers > Single Diodes

Taiwan Semiconductor Corporation S1KLS

Name: S1KLS
Brand: Taiwan Semiconductor Corporation
SKU: S1KLS
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: S1KLS

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: SOD-123H

Datasheet:: S1KLS.pdf

Description:: 1.2A, 800V, STANDARD RECOVERY RE

Quantity:: RFQ Add To RFQ list

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Inventory:20,000

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Product details

Overview

S1KLS from Taiwan Semiconductor is a 1.2A, 800V repetitive peak reverse voltage (V_RRM) standard surface-mount silicon rectifier diode in SOD-123HE package, designed for high-efficiency DC/DC conversion and switching-mode power supplies where compact size, low forward voltage (≤1.3 V at 1.2 A), and 50 A surge capability are critical.

For engineers reviewing the S1KLS datasheet, S1KLS pinout, S1KLS application, or S1KLS equivalent, key selection factors include its 800 V V_RRM, 1.2 A average forward current rating, SOD-123HE thermal performance (R_θJA = 86 °C/W), and cathode-band polarity marking for reliable automated placement in high-volume PCB assembly.

Technical Context

The S1KLS is a single-die, planar-passivated silicon PN junction rectifier optimized for fast recovery and low conduction loss in medium-voltage SMPS front-end and output stages. Its 800 V V_RRM and 50 A I_FSM support robust operation under transient overvoltage and inrush conditions.

Thermal design is enabled by its SOD-123HE package with matte tin-plated leads and 46 °C/W junction-to-lead resistance, validated on 5 mm × 5 mm Cu pad test board per JESD 51-3. Reverse leakage remains ≤5 µA at 25 °C and ≤150 µA at 125 °C under rated VR.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	800 V - Maximum non-repetitive reverse voltage the device blocks without breakdown; defines usable input voltage range in AC/DC and DC/DC converters.
I_F	1.2 A - Continuous average forward current at T_A = 25 °C; sets steady-state power handling in rectification paths.
I_FSM	50 A - Peak non-repetitive surge current (8.3 ms half-sine); enables survival during cold-start or short-circuit transients.
V_F	≤1.3 V @ 1.2 A, 25 °C - Forward voltage drop directly impacts conduction loss and thermal rise in high-current paths.
T_J max	+175 °C - Maximum junction temperature; supports operation in thermally constrained industrial and automotive under-hood environments.
R_θJA	86 °C/W - Junction-to-ambient thermal resistance on standard PCB; determines required copper area and airflow for thermal management.

Pinout & Package

Package: SOD-123HE - Surface-mount plastic package with gull-wing leads, UL 94V-0 molding compound, moisture sensitivity level 1, and cathode band polarity indicator. Weight: 0.022 g.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to lower-potential side of AC source or switch node; must be routed with adequate current-carrying trace width.
Cathode	Forward current exit point	Marked by visible band; connects to output capacitor or load return; polarity error causes open-circuit failure.

Key Features

Feature	Design Value
High surge current capability	50 A I_FSM enables reliable operation during line surges and inrush events without derating.
Low forward voltage	V_F ≤ 1.3 V at full rated current reduces conduction loss and improves system efficiency in 12–48 V output rails.
Compact SOD-123HE footprint	Enables high-density layout in space-constrained DC/DC modules and adapter PCBs without sacrificing thermal performance.
Moisture sensitivity level 1	Eliminates bake requirements prior to reflow, reducing manufacturing cost and cycle time in automated SMT lines.

Applications

AC/DC Adapter Input Rectification	DC/DC Converter Output Stage
Use Scenario: Rectifying 100–240 VAC input in universal-input offline adapters powering consumer electronics. IC Role / Device Role / Timing Role: Standard rectifier diode conducting during positive half-cycle; provides unidirectional current path to bulk capacitor. Use Value: 800 V V_RRM ensures margin against line spikes and differential-mode transients up to ±1 kV.	Use Scenario: Secondary-side rectification in isolated flyback or forward converters delivering 5–24 V outputs. IC Role / Device Role / Timing Role: Freewheeling/rectifying diode synchronized with primary-side switching; handles continuous 1.2 A load current. Use Value: Low V_F minimizes conduction loss and improves efficiency in low-voltage, high-current output stages.
Industrial Power Supply Front-End	Automotive DC/DC Module Input Protection
Use Scenario: Input bridge rectification in 24/48 V industrial PSUs operating in ambient temperatures up to 85 °C. IC Role / Device Role / Timing Role: Single-phase rectifier in discrete bridge configuration; withstands sustained 1.2 A average current and thermal cycling. Use Value: +175 °C T_J max and 86 °C/W R_θJA allow stable operation without forced cooling in enclosed enclosures.	Use Scenario: Input rectification and reverse-polarity protection in 12 V automotive DC/DC modules for infotainment systems. IC Role / Device Role / Timing Role: Polarity-sensitive rectifier placed before buck converter; blocks reverse battery connection. Use Value: Cathode-band marking and RoHS/halogen-free compliance meet automotive OEM sourcing and safety requirements.

AC/DC Adapter Input Rectification

DC/DC Converter Output Stage

Use Scenario: Rectifying 100–240 VAC input in universal-input offline adapters powering consumer electronics.

IC Role / Device Role / Timing Role: Standard rectifier diode conducting during positive half-cycle; provides unidirectional current path to bulk capacitor.

Use Value: 800 V V_RRM ensures margin against line spikes and differential-mode transients up to ±1 kV.

Use Scenario: Secondary-side rectification in isolated flyback or forward converters delivering 5–24 V outputs.

IC Role / Device Role / Timing Role: Freewheeling/rectifying diode synchronized with primary-side switching; handles continuous 1.2 A load current.

Use Value: Low V_F minimizes conduction loss and improves efficiency in low-voltage, high-current output stages.

Industrial Power Supply Front-End

Automotive DC/DC Module Input Protection

Use Scenario: Input bridge rectification in 24/48 V industrial PSUs operating in ambient temperatures up to 85 °C.

IC Role / Device Role / Timing Role: Single-phase rectifier in discrete bridge configuration; withstands sustained 1.2 A average current and thermal cycling.

Use Value: +175 °C T_J max and 86 °C/W R_θJA allow stable operation without forced cooling in enclosed enclosures.

Use Scenario: Input rectification and reverse-polarity protection in 12 V automotive DC/DC modules for infotainment systems.

IC Role / Device Role / Timing Role: Polarity-sensitive rectifier placed before buck converter; blocks reverse battery connection.

Use Value: Cathode-band marking and RoHS/halogen-free compliance meet automotive OEM sourcing and safety requirements.

Equivalent & Alternatives

The following parts are listed as comparable options for similar rectifier diode applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ON Semiconductor MUR120SFT1G	200 V V_RRM, 1.2 A I_F, faster recovery (~75 ns), TO-277 package	Lower voltage rating limits use to <200 V circuits; faster recovery suits higher-frequency topologies	Select when operating frequency exceeds 100 kHz and voltage stress is ≤200 V.
Vishay VS-1N4007-M3/54	1000 V V_RRM, 1 A I_F, DO-41 through-hole, 30 A I_FSM	Lower current rating and through-hole mounting restrict use to low-density, low-volume, or legacy designs	Choose only for prototyping or replacement in existing DO-41 layouts where SMD is not feasible.

Compared with MUR120SFT1G and VS-1N4007-M3/54, the S1KLS uniquely balances 800 V blocking, 1.2 A continuous current, SOD-123HE surface-mount compatibility, and industrial-grade thermal specs-making it optimal for modern, high-density, medium-voltage SMPS designs requiring no layout compromise.

Availability

S1KLS is available at Aetrix Electronics and suitable for DC/DC converters, switching-mode inverters, and general-purpose rectification requiring stable component supply, consistent parametric performance across production lots, and long-term lifecycle availability.

Supply support for S1KLS 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 diodes, MOSFETs, and LED drivers.

The S1KLS belongs to TSC's S1xLS family of standard rectifiers engineered for high-reliability, cost-effective AC/DC and DC/DC power conversion in industrial, computing, and consumer power supplies.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) for the S1KLS?

The S1KLS has a maximum repetitive peak reverse voltage (V_RRM) of 800 V, as specified in the Absolute Maximum Ratings table. This value is fixed for the S1KLS variant within the S1DLS–S1MLS series and defines the highest reverse-biased voltage the diode can block continuously without breakdown. It is verified per JEDEC test conditions and applies at T_A = 25 °C.

Does the S1KLS have a specified forward voltage (V_F) at full rated current?

Yes, the S1KLS has a maximum forward voltage (V_F) of 1.3 V at I_F = 1.2 A and T_J = 25 °C, per the Electrical Specifications table. This value is measured under pulsed conditions (PW = 0.3 ms) and represents the worst-case conduction loss under nominal load, critical for thermal and efficiency calculations in the S1KLS application.

What package type is used for the S1KLS, and what are its key mechanical attributes?

The S1KLS uses the SOD-123HE surface-mount package, featuring matte tin-plated gull-wing leads compliant with J-STD-002, UL 94V-0 molding compound, polarity indicated by a cathode band, and a weight of approximately 0.022 g. Its dimensions and pad layout are standardized per TSC's Package Outline Drawings, enabling direct integration into automated SMT lines.

Is the S1KLS RoHS and halogen-free compliant?

Yes, the S1KLS is RoHS compliant and halogen-free per IEC 61249-2-21, as explicitly stated in the FEATURES section of the official documentation. These compliance statements apply specifically to the S1KLS variant and are verified through material declarations and third-party testing per TSC's quality assurance process.

What is the peak forward surge current (I_FSM) rating for the S1KLS, and under what condition is it defined?

The S1KLS has a peak forward surge current (I_FSM) rating of 50 A, defined for an 8.3 ms single half-sine wave superimposed on rated load, per the Absolute Maximum Ratings table. This rating ensures the S1KLS can survive common power-line transients and inrush currents without degradation, provided junction temperature remains within limits during the event.

S1KLS Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: SOD-123H

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 800 V

Current - Average Rectified (Io):: 1.2A

Voltage - Forward (Vf) (Max) @ If:: 1.3 V @ 1.2 A

Speed:: Standard Recovery >500ns, > 200mA (Io)

Reverse Recovery Time (trr):: -

Current - Reverse Leakage @ Vr:: 5 µA @ 800 V

Capacitance @ Vr, F:: -

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOD-123HE

Operating Temperature - Junction:: -55°C ~ 150°C

S1KLS FAQ

1.How can I place an order for S1KLS through Aetrix?

Please submit a Request for Quotation (RFQ) for S1KLS 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 S1KLS reliable?

The price and inventory of S1KLS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for S1KLS is usually 5 days.

3.What payment methods are accepted for S1KLS?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for S1KLS transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for S1KLS?

S1KLS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your S1KLS 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 S1KLS?

For technical support, including S1KLS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your S1KLS requirements.

6.How does Aetrix verify that S1KLS is sourced from the original manufacturer or authorized distributors?

All S1KLS 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 S1KLS meets industry standards.

7.What is the process for return or replacement of S1KLS?

All S1KLS units undergo pre-shipment inspection (PSI). If there is an issue with S1KLS, 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 S1KLS part is unused and in its original packaging.

Return procedure for S1KLS:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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