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

Taiwan Semiconductor Corporation S4KH

Name: S4KH
Brand: Taiwan Semiconductor Corporation
SKU: S4KH
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: S4KH

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-214AB, SMC

Datasheet:: S4KH.pdf

Description:: 4A, 800V, STANDARD RECOVERY RECT

Quantity:: RFQ Add To RFQ list

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Inventory:2,980

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Product details

Overview

S4KH from Taiwan Semiconductor is a surface-mount silicon rectifier diode rated for 800 V repetitive peak reverse voltage (V_RRM), 4 A average forward current (I_F), and 100 A non-repetitive surge current (I_FSM). It features glass-passivated junction, low 1.15 V forward voltage at 4 A/25°C, and DO-214AB (SMC) package - used in automotive lighting, DC-DC converters, and snubber circuits.

For engineers reviewing the S4KH datasheet, S4KH pinout, S4KH application, or S4KH equivalent, key selection criteria include its AEC-Q101 qualification, 150°C maximum junction temperature, 13°C/W junction-to-lead thermal resistance, and J-STD-020 Level 1 moisture sensitivity - critical for high-reliability automotive and industrial power conversion designs.

Technical Context

The S4KH is a single-die, standard recovery rectifier with 1500 ns reverse recovery time (t_rr) under I_F = 0.5 A / I_R = 1.0 A / I_rr = 0.25 A conditions. Its 60 pF junction capacitance at 1 MHz / 4 V enables stable operation in moderate-frequency switching applications.

Designed for surface-mount assembly, it uses matte tin-plated leads compliant with J-STD-002 solderability and meets JESD 201 Class 2 whisker resistance. Polarity is marked by cathode band on the DO-214AB case.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	800 V - supports input stages in 400–600 V DC bus systems without derating
I_F	4 A continuous - suitable for medium-power rectification in automotive ECUs and LED drivers
I_FSM	100 A (8.3 ms half-sine) - withstands inrush and transient surges in ignition or load-dump scenarios
V_F	≤1.15 V @ 4 A, 25°C - reduces conduction loss and thermal stress in thermally constrained layouts
t_rr	1500 ns - compatible with ≤100 kHz switching topologies; not intended for high-frequency SMPS
R_θJL	13 °C/W - enables direct thermal coupling to PCB copper for passive cooling in space-limited modules
Moisture Sensitivity	Level 1 per J-STD-020 - no dry-pack or bake required before reflow

Pinout & Package

Package: DO-214AB (SMC), molded epoxy case with matte tin-plated leads; cathode indicated by band. Weight: 0.210 g.

Pin/Terminal	Circuit Role	Design Meaning
Anode (Lead 1)	Forward current entry point	Connected to lower-potential side of AC source or transformer secondary; requires adequate trace width for 4 A RMS
Cathode (Lead 2)	Forward current exit / reverse blocking terminal	Marked by band; ties to positive rail; must maintain creepage/clearance for 800 V working voltage

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive underhood environments including temperature cycling, HAST, and mechanical shock
Glass-passivated junction	Enhances long-term reliability and humidity resistance vs. epoxy-passivated alternatives
Junction-to-lead R_θJL = 13°C/W	Enables >70% of heat to transfer directly to PCB copper, reducing need for heatsinks
Halogen-free (IEC 61249-2-21)	Complies with automotive OEM material declarations and end-of-life recycling requirements
RoHS compliant	Meets EU Directive 2011/65/EU and China RoHS II for restricted substances

Applications

Automotive Lighting Systems	DC-DC Converter Input Stage
Use Scenario: Rectifying alternator output or battery-fed boost converter input in LED headlamp modules. IC Role / Device Role / Timing Role: Primary AC-to-DC rectifier handling 4 A continuous and load-dump transients up to 100 A. Use Value: AEC-Q101 qualification and 150°C T_JMAX ensure uninterrupted operation under hood temperatures exceeding 125°C.	Use Scenario: Input bridge rectification in 24 V–48 V industrial DC-DC converters powering PoE switches or PLC I/O modules. IC Role / Device Role / Timing Role: Unidirectional current path with low V_F to minimize conduction loss and thermal rise at full load. Use Value: 1.15 V V_F at 4 A reduces power dissipation by ~0.3 W versus higher-V_F alternatives, easing thermal design.
Snubber Networks	General-Purpose Power Supply Rectification
Use Scenario: Clamping voltage spikes across MOSFETs/IGBTs in motor drive inverters or power factor correction circuits. IC Role / Device Role / Timing Role: Fast-acting clamp diode absorbing inductive kickback energy during switch turn-off. Use Value: 800 V V_RRM provides margin against overshoot in 600 V bus systems; 1500 ns t_rr balances speed and noise suppression.	Use Scenario: Output rectification in offline AC-DC adapters for industrial HMIs and sensor transmitters. IC Role / Device Role / Timing Role: General-purpose power diode replacing legacy axial-leaded types in automated SMT lines. Use Value: DO-214AB package enables high-density layout; Level 1 MSL eliminates pre-bake steps, improving line efficiency.

Automotive Lighting Systems

DC-DC Converter Input Stage

Use Scenario: Rectifying alternator output or battery-fed boost converter input in LED headlamp modules.

IC Role / Device Role / Timing Role: Primary AC-to-DC rectifier handling 4 A continuous and load-dump transients up to 100 A.

Use Value: AEC-Q101 qualification and 150°C T_JMAX ensure uninterrupted operation under hood temperatures exceeding 125°C.

Use Scenario: Input bridge rectification in 24 V–48 V industrial DC-DC converters powering PoE switches or PLC I/O modules.

IC Role / Device Role / Timing Role: Unidirectional current path with low V_F to minimize conduction loss and thermal rise at full load.

Use Value: 1.15 V V_F at 4 A reduces power dissipation by ~0.3 W versus higher-V_F alternatives, easing thermal design.

Snubber Networks

General-Purpose Power Supply Rectification

Use Scenario: Clamping voltage spikes across MOSFETs/IGBTs in motor drive inverters or power factor correction circuits.

IC Role / Device Role / Timing Role: Fast-acting clamp diode absorbing inductive kickback energy during switch turn-off.

Use Value: 800 V V_RRM provides margin against overshoot in 600 V bus systems; 1500 ns t_rr balances speed and noise suppression.

Use Scenario: Output rectification in offline AC-DC adapters for industrial HMIs and sensor transmitters.

IC Role / Device Role / Timing Role: General-purpose power diode replacing legacy axial-leaded types in automated SMT lines.

Use Value: DO-214AB package enables high-density layout; Level 1 MSL eliminates pre-bake steps, improving line efficiency.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Vishay VS-4EYH08-M3	Same DO-214AB package, 800 V V_RRM, but 1.30 V V_F max @ 4 A; t_rr = 2000 ns	Higher conduction loss and slower recovery limit use in thermally tight or higher-frequency snubbers	Prefer S4KH where lower V_F or faster t_rr is needed
ON Semiconductor MUR480G	Ultrafast recovery (t_rr = 75 ns), same 800 V rating, but TO-220AC package - not SMT-compatible	Requires through-hole assembly and heatsinking; unsuitable for high-density automotive PCBs	Select S4KH for SMT-only, space-constrained, or AEC-Q101–required designs

Compared with VS-4EYH08-M3 and MUR480G, the S4KH delivers superior forward voltage performance in an AEC-Q101–qualified SMT package - making it optimal for automotive lighting and compact DC-DC converters where thermal efficiency and qualification compliance are mandatory.

Availability

S4KH is available at Aetrix Electronics and suitable for automotive lighting systems, DC-DC converter input stages, and snubber networks requiring stable component supply across extended production lifecycles.

Supply support for S4KH 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 automotive, industrial, and consumer markets since 1979.

The S4KH belongs to TSC's S4xH family of AEC-Q101–qualified surface-mount rectifiers, engineered specifically for high-reliability automotive power conversion and industrial snubbing where robustness, thermal performance, and process consistency are essential.

FAQ

What is the maximum junction temperature rating for the S4KH?

The S4KH has a maximum junction temperature (T_JMAX) of +150°C, verified per AEC-Q101 stress testing. This rating allows reliable operation in under-hood automotive environments and high-ambient industrial settings. Derating curves in the official S4KH datasheet define safe operating current versus ambient temperature, and thermal design must account for R_θJL = 13°C/W to maintain S4KH junction temperature within limits.

Is the S4KH pin-compatible with other devices in the S4xH series?

Yes - all S4xH series rectifiers, including S4KH, share identical DO-214AB (SMC) package dimensions, lead configuration, and polarity marking (cathode band). The only functional difference is V_RRM: S4KH is rated for 800 V, while S4MH is 1000 V and S4JH is 600 V. Layout reuse is fully supported across the family, provided voltage derating and thermal margins are validated for each variant.

Does the S4KH meet automotive qualification standards?

Yes, the S4KH is explicitly AEC-Q101 qualified, as documented in Taiwan Semiconductor's certification reports and datasheet Version A2102. This includes stress tests for temperature cycling, high-acceleration life testing (HALT), unbiased highly accelerated stress test (uHAST), and mechanical shock - confirming suitability for automotive power electronics such as body control modules and LED lighting drivers.

What is the reverse leakage current specification for the S4KH at elevated temperature?

At T_J = 125°C and rated V_R, the S4KH exhibits a maximum reverse leakage current (I_R) of 250 µA, per the electrical specifications table. At 25°C, I_R is limited to 10 µA. This low leakage supports stable voltage hold-off in high-impedance snubber or bias networks, especially critical in automotive systems where leakage-induced drift could affect sensor reference stability.

Can the S4KH be used in high-frequency switching applications?

No - the S4KH is a standard recovery rectifier with t_rr = 1500 ns, optimized for line-frequency and low-to-moderate frequency (<100 kHz) applications like DC-DC input stages and snubbers. For high-frequency SMPS (>200 kHz), ultrafast or Schottky alternatives with t_rr < 100 ns are recommended. Using S4KH beyond its specified recovery envelope may increase switching loss and EMI in high-frequency designs.

S4KH Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: DO-214AB, SMC

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Standard

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

Current - Average Rectified (Io):: 4A

Voltage - Forward (Vf) (Max) @ If:: 1.15 V @ 4 A

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

Reverse Recovery Time (trr):: 1.5 µs

Current - Reverse Leakage @ Vr:: 10 µA @ 800 V

Capacitance @ Vr, F:: 60pF @ 4V, 1MHz

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: DO-214AB (SMC)

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

S4KH FAQ

1.How can I place an order for S4KH through Aetrix?

Please submit a Request for Quotation (RFQ) for S4KH 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 S4KH reliable?

The price and inventory of S4KH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for S4KH is usually 5 days.

3.What payment methods are accepted for S4KH?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for S4KH transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for S4KH?

S4KH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your S4KH 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 S4KH?

For technical support, including S4KH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your S4KH requirements.

6.How does Aetrix verify that S4KH is sourced from the original manufacturer or authorized distributors?

All S4KH 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 S4KH meets industry standards.

7.What is the process for return or replacement of S4KH?

All S4KH units undergo pre-shipment inspection (PSI). If there is an issue with S4KH, 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 S4KH part is unused and in its original packaging.

Return procedure for S4KH:

1.Submit a request within 90 days.

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

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