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

Taiwan Semiconductor Corporation S1KALH

Name: S1KALH
Brand: Taiwan Semiconductor Corporation
SKU: S1KALH
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: S1KALH

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-221AC, SMA Flat Leads

Datasheet:: S1KALH.pdf

Description:: DIODE GEN PURP 800V 1A THIN SMA

Quantity:: RFQ Add To RFQ list

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Inventory:6,893

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Product details

Overview

S1KALH from Taiwan Semiconductor is a 1 A, 800 V standard surface-mount silicon rectifier diode in a Thin SMA package, featuring glass-passivated junction, AEC-Q101 qualification, and 30 A surge capability; used for freewheeling and snubber functions in automotive DC/DC converters.

For engineers reviewing the S1KALH datasheet, S1KALH pinout, S1KALH application, or S1KALH equivalent, key selection criteria include peak reverse voltage (800 V), forward voltage at 1 A (≤1.10 V @ 25°C), thermal resistance (R_θJA = 82 °C/W), AEC-Q101 qualification, and Thin SMA package compatibility with automated placement.

Technical Context

The S1KALH is a single-die, unidirectional silicon rectifier optimized for high-reliability automotive and industrial power conversion. Its glass-passivated junction ensures stable reverse leakage (<1 µA @ 25°C, <50 µA @ 125°C) and robustness against moisture and mechanical stress.

Thermal performance is defined for mounting on a 5 mm × 5 mm copper pad: R_θJL = 29 °C/W and R_θJC = 30 °C/W enable effective heat transfer in space-constrained layouts, while the 150 °C maximum junction temperature supports operation in under-hood environments.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	800 V - Maximum repetitive reverse voltage; defines safe blocking capability in 48 V–400 V bus applications.
I_F	1 A continuous - Rated average forward current; supports steady-state conduction in low-power DC/DC stages.
I_FSM (8.3 ms)	30 A - Surge current rating; withstands inductive turn-off transients without failure.
V_F @ 1 A, 25°C	≤1.10 V - Forward voltage drop; determines conduction loss and thermal load at full rated current.
R_θJA	82 °C/W - Junction-to-ambient thermal resistance on standard PCB; sets thermal derating slope for ambient temperature design.
Junction Temp Range	−55 °C to +150 °C - Operating range compatible with automotive under-hood and industrial control environments.
C_J @ 1 MHz, 4 V	8 pF - Junction capacitance; influences high-frequency switching behavior and EMI in snubber circuits.

Pinout & Package

Package: Thin SMA (Surface Mount Axial), low-profile, matte tin-plated leads, polarity indicated by cathode band, moisture sensitivity level 1 per J-STD-020.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to lower-potential side of circuit; must be routed with adequate copper area for thermal dissipation.
Cathode	Forward current exit / reverse voltage blocking terminal	Marked by band; ties to higher-potential node; critical for correct orientation in freewheeling paths.

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive electronics use, including temperature cycling, mechanical shock, and humidity testing per stress test requirements.
Glass-passivated junction	Enhances long-term reliability and stability of reverse leakage current across temperature and humidity variations.
Thin SMA package	Enables high-density PCB layout and compatibility with standard SMT pick-and-place equipment and reflow profiles.
Moisture sensitivity level 1	Eliminates need for dry-packaging or baking prior to assembly-reduces manufacturing overhead and handling risk.
Halogen-free construction	Complies with IEC 61249-2-21, supporting environmental compliance and safer end-of-life processing.

Applications

Automotive DC/DC Converters	Industrial Snubber Circuits
Use Scenario: Step-down conversion in 12 V/48 V dual-battery systems with inductive switching elements. IC Role / Device Role / Timing Role: Freewheeling diode providing current path during MOSFET off-time to clamp inductive kickback. Use Value: 800 V V_RRM and 30 A I_FSM ensure robust protection against voltage spikes up to 600 V transient events.	Use Scenario: RC snubber network across relay contacts or IGBTs in motor drives and PLC outputs. IC Role / Device Role / Timing Role: Fast-recovery rectifier absorbing energy during switch turn-off to suppress voltage overshoot. Use Value: Low C_J (8 pF) minimizes capacitive loading while maintaining low leakage (<1 µA @ 25°C) for stable snubber timing.
On-Board Charger Auxiliary Supplies	LED Driver Flyback Outputs
Use Scenario: Auxiliary bias supply derived from main transformer secondary in bidirectional OBC topologies. IC Role / Device Role / Timing Role: Output rectifier converting high-frequency AC to regulated DC for control ICs and gate drivers. Use Value: 150 °C T_JMAX and R_θJA = 82 °C/W allow reliable operation in thermally dense OBC modules without forced air.	Use Scenario: Secondary-side rectification in isolated flyback LED drivers for street lighting and signage. IC Role / Device Role / Timing Role: Main output rectifier delivering constant current to LED strings with minimal conduction loss. Use Value: V_F ≤ 1.10 V @ 1 A reduces power loss and improves efficiency over wide ambient temperature range (−40°C to +105°C).

Automotive DC/DC Converters

Industrial Snubber Circuits

Use Scenario: Step-down conversion in 12 V/48 V dual-battery systems with inductive switching elements.

IC Role / Device Role / Timing Role: Freewheeling diode providing current path during MOSFET off-time to clamp inductive kickback.

Use Value: 800 V V_RRM and 30 A I_FSM ensure robust protection against voltage spikes up to 600 V transient events.

Use Scenario: RC snubber network across relay contacts or IGBTs in motor drives and PLC outputs.

IC Role / Device Role / Timing Role: Fast-recovery rectifier absorbing energy during switch turn-off to suppress voltage overshoot.

Use Value: Low C_J (8 pF) minimizes capacitive loading while maintaining low leakage (<1 µA @ 25°C) for stable snubber timing.

On-Board Charger Auxiliary Supplies

LED Driver Flyback Outputs

Use Scenario: Auxiliary bias supply derived from main transformer secondary in bidirectional OBC topologies.

IC Role / Device Role / Timing Role: Output rectifier converting high-frequency AC to regulated DC for control ICs and gate drivers.

Use Value: 150 °C T_JMAX and R_θJA = 82 °C/W allow reliable operation in thermally dense OBC modules without forced air.

Use Scenario: Secondary-side rectification in isolated flyback LED drivers for street lighting and signage.

IC Role / Device Role / Timing Role: Main output rectifier delivering constant current to LED strings with minimal conduction loss.

Use Value: V_F ≤ 1.10 V @ 1 A reduces power loss and improves efficiency over wide ambient temperature range (−40°C to +105°C).

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH1R08	Same 1 A / 800 V rating; TO-277 package (higher R_θJA ≈ 100 °C/W); no AEC-Q101 qualification.	Preferred for non-automotive industrial use where board space is less constrained and qualification not required.	Select when cost sensitivity outweighs automotive qualification and thermal performance needs.
ES1J	1 A / 600 V; SMA package; AEC-Q101 qualified; lower V_RRM limits use to ≤400 V systems.	Suitable only in lower-voltage DC/DC stages where 600 V margin suffices.	Choose only if system peak reverse voltage remains below 420 V and automotive qualification is mandatory.

Compared with STTH1R08 and ES1J, the S1KALH uniquely combines AEC-Q101 qualification, 800 V blocking, Thin SMA footprint, and industry-leading R_θJA (82 °C/W), making it optimal for space- and reliability-critical automotive power supplies.

Availability

S1KALH is available at Aetrix Electronics and suitable for automotive DC/DC converters, industrial snubber networks, and LED driver flyback outputs requiring stable component supply, consistent lead times, and full traceability.

Supply support for S1KALH 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 automotive, industrial, and consumer markets since 1979.

The S1KALH belongs to TSC's AEC-Q101-qualified Thin SMA rectifier family, engineered specifically for high-reliability surface-mount power conversion in automotive and harsh-environment industrial applications.

FAQ

What is the peak repetitive reverse voltage rating of the S1KALH?

The S1KALH has a peak repetitive reverse voltage (V_RRM) rating of 800 V. This value is confirmed in the Absolute Maximum Ratings table on page 2 of the official Taiwan Semiconductor datasheet (Version B2103). It defines the maximum reverse voltage the device can block repeatedly without breakdown, making S1KALH suitable for 400 V-class bus applications with safety margin.

Is the S1KALH qualified for automotive applications?

Yes, the S1KALH is explicitly AEC-Q101 qualified, as stated in the FEATURES section of the Taiwan Semiconductor datasheet. This qualification covers stress tests including temperature cycling, high-temperature operating life, and unbiased highly accelerated stress testing-ensuring reliability in automotive under-hood and powertrain environments.

What is the forward voltage drop of the S1KALH at 1 A and 25°C?

The forward voltage (V_F) of the S1KALH is specified as a maximum of 1.10 V at I_F = 1 A and T_J = 25°C, per the Electrical Specifications table. The typical value is 0.96 V under those conditions. This parameter directly impacts conduction losses and thermal design in power supply output stages.

What package type does the S1KALH use, and what are its key mechanical attributes?

The S1KALH uses the Thin SMA package: a low-profile surface-mount axial outline with matte tin-plated leads, cathode band polarity marking, and UL 94V-0 compliant molding compound. Its weight is approximately 0.029 g, and it meets JESD 201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1.

Does the S1KALH have a specified junction-to-ambient thermal resistance?

Yes, the S1KALH has a junction-to-ambient thermal resistance (R_θJA) of 82 °C/W, measured on a standard 5 mm × 5 mm copper pad PCB per JEDEC test conditions. This value is critical for calculating allowable power dissipation and thermal derating curves in real-world layouts.

S1KALH 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:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: Thin SMA

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

S1KALH FAQ

1.How can I place an order for S1KALH through Aetrix?

Please submit a Request for Quotation (RFQ) for S1KALH 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 S1KALH reliable?

The price and inventory of S1KALH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for S1KALH is usually 5 days.

3.What payment methods are accepted for S1KALH?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for S1KALH transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for S1KALH?

S1KALH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your S1KALH 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 S1KALH?

For technical support, including S1KALH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your S1KALH requirements.

6.How does Aetrix verify that S1KALH is sourced from the original manufacturer or authorized distributors?

All S1KALH 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 S1KALH meets industry standards.

7.What is the process for return or replacement of S1KALH?

All S1KALH units undergo pre-shipment inspection (PSI). If there is an issue with S1KALH, 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 S1KALH part is unused and in its original packaging.

Return procedure for S1KALH:

1.Submit a request within 90 days.

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

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