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

Taiwan Semiconductor Corporation S3KB-K

Name: S3KB-K
Brand: Taiwan Semiconductor Corporation
SKU: S3KB-K
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: S3KB-K

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-214AA, SMB

Datasheet:: S3KB-K.pdf

Description:: 3A, 800V, STANDARD RECTIFIER

Quantity:: RFQ Add To RFQ list

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Inventory:2,357

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Product details

Overview

S3KB-K from Taiwan Semiconductor is a 3A, 800V repetitive peak reverse voltage (V_RRM) surface-mount standard rectifier diode in DO-214AA (SMB) package, featuring glass-passivated junction, low reverse leakage (≤5 µA at 25°C), and 0.93 V forward voltage at 3.0 A/25°C - used in DC-DC converters and switching-mode inverters.

For engineers reviewing the S3KB-K datasheet, S3KB-K pinout, S3KB-K application, or S3KB-K equivalent, key selection criteria include V_RRM = 800 V, I_F = 3 A, I_FSM = 80 A (8.3 ms), T_J max = 150°C, and SMB package thermal resistance R_θJA = 78°C/W on 10 mm × 10 mm Cu pad.

Technical Context

This single-die standard recovery rectifier operates with a maximum junction temperature of 150°C and supports surge currents up to 224 A for 1.0 ms. Its glass-passivated chip junction ensures stable reverse characteristics and low IR drift over temperature.

Electrical behavior is defined by forward voltage ranging from 0.87 V (3.0 A, 125°C) to 0.93 V (3.0 A, 25°C), and reverse current limited to 300 µA at 125°C under rated V_R, making it suitable for medium-frequency switching applications up to ~100 kHz.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	800 V - maximum repetitive reverse blocking voltage; defines safe operating limit in bridge or freewheeling configurations
I_F	3 A continuous average forward current - determines heatsink or PCB copper area requirements
I_FSM (8.3 ms)	80 A non-repetitive surge - supports inrush and transient overload handling without failure
V_F @ 3.0 A, 25°C	0.93 V typical - directly impacts conduction loss and thermal rise in power stage
R_θJA	78 °C/W - thermal resistance from junction to ambient on standard 10 mm × 10 mm Cu pad; guides thermal layout design
I_R @ 25°C	≤5 µA - low leakage preserves efficiency in high-impedance bias or hold-up circuits
T_J max	150 °C - maximum allowable junction temperature; sets derating curve for sustained operation

Pinout & Package

DO-214AA (SMB) surface-mount package with cathode-indicated band; matte tin-plated leads, moisture sensitivity level 1 (J-STD-020), UL 94V-0 molding compound, and 0.090 g mass.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to lower-potential side in rectification path; requires adequate trace width for 3 A RMS
Cathode	Forward current exit / reverse blocking terminal	Marked by band; ties to output rail or switching node; critical for polarity-sensitive layouts

Key Features

Feature	Design Value
Glass-passivated junction	Enables stable long-term reverse leakage performance and humidity resistance per J-STD-020 Level 1
Low V_F at high temperature	0.87 V @ 3.0 A/125°C reduces conduction loss drift in thermally stressed environments
Halogen-free construction	Complies with IEC 61249-2-21; eliminates corrosive outgassing during reflow and field operation
Automated placement compatibility	DO-214AA (SMB) footprint and lead geometry support high-yield pick-and-place assembly

Applications

DC-DC Converter	Switching Inverter
Use Scenario: Secondary-side rectification in isolated flyback or forward converters delivering 12–48 V output. IC Role / Device Role / Timing Role: Standard recovery rectifier conducting unidirectional current during transformer secondary half-cycle. Use Value: 800 V V_RRM provides margin against reflected transients; 3 A rating supports up to ~60 W output with forced-air cooling.	Use Scenario: Freewheeling diode across IGBTs or MOSFETs in motor drive H-bridge outputs. IC Role / Device Role / Timing Role: Provides low-loss current recirculation path during switch off-time in PWM-controlled inverters. Use Value: 80 A I_FSM handles motor stall surges; 0.93 V V_F limits conduction loss in 16–20 kHz switching range.
General-Purpose Power Supply	Industrial AC-DC Adapter
Use Scenario: Input-stage bridge rectification in offline 115/230 VAC SMPS with PFC pre-regulator. IC Role / Device Role / Timing Role: Single-diode element in discrete full-wave bridge configuration. Use Value: 150°C T_J max enables operation in compact enclosures; RoHS/halogen-free compliance meets regional safety mandates.	Use Scenario: Output rectification in universal-input 12 V/2 A wall adapters with tight thermal constraints. IC Role / Device Role / Timing Role: Primary output rectifier in self-oscillating or QR flyback topology. Use Value: Low 5 µA I_R at 25°C minimizes no-load power loss; SMB package allows high-density board layout.

DC-DC Converter

Switching Inverter

Use Scenario: Secondary-side rectification in isolated flyback or forward converters delivering 12–48 V output.

IC Role / Device Role / Timing Role: Standard recovery rectifier conducting unidirectional current during transformer secondary half-cycle.

Use Value: 800 V V_RRM provides margin against reflected transients; 3 A rating supports up to ~60 W output with forced-air cooling.

Use Scenario: Freewheeling diode across IGBTs or MOSFETs in motor drive H-bridge outputs.

IC Role / Device Role / Timing Role: Provides low-loss current recirculation path during switch off-time in PWM-controlled inverters.

Use Value: 80 A I_FSM handles motor stall surges; 0.93 V V_F limits conduction loss in 16–20 kHz switching range.

General-Purpose Power Supply

Industrial AC-DC Adapter

Use Scenario: Input-stage bridge rectification in offline 115/230 VAC SMPS with PFC pre-regulator.

IC Role / Device Role / Timing Role: Single-diode element in discrete full-wave bridge configuration.

Use Value: 150°C T_J max enables operation in compact enclosures; RoHS/halogen-free compliance meets regional safety mandates.

Use Scenario: Output rectification in universal-input 12 V/2 A wall adapters with tight thermal constraints.

IC Role / Device Role / Timing Role: Primary output rectifier in self-oscillating or QR flyback topology.

Use Value: Low 5 µA I_R at 25°C minimizes no-load power loss; SMB package allows high-density board layout.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH3L06S	V_RRM = 600 V, I_F = 3 A, V_F = 0.95 V @ 3 A, DO-214AA	Limited to ≤600 V systems; lower voltage margin than S3KB-K's 800 V rating	Select when cost sensitivity outweighs need for 800 V transient headroom
ES3J	V_RRM = 600 V, I_F = 3 A, V_F = 0.92 V @ 3 A, DO-214AA	Same package but 200 V lower V_RRM; higher I_R (10 µA typ.) at 25°C	Acceptable for fixed 230 VAC input designs where 600 V suffices and leakage is non-critical

Compared with STTH3L06S and ES3J, the S3KB-K delivers 200–400 V higher reverse voltage rating while maintaining identical 3 A current capability and SMB footprint - enabling direct substitution only where system-level transient margins require ≥800 V blocking.

Availability

S3KB-K is available at Aetrix Electronics and suitable for DC-DC converters, switching inverters, and industrial AC-DC adapters requiring stable component supply, consistent parametric performance, and RoHS-compliant manufacturing.

Supply support for S3KB-K 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 and protection markets since 1979.

The S3KB-K belongs to TSC's S3x-K series of standard recovery rectifiers designed specifically for cost-sensitive, medium-power industrial and consumer switching power supplies requiring robust thermal performance and JEDEC-compliant packaging.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) for the S3KB-K?

The S3KB-K has a V_RRM of 800 V, as confirmed in the Absolute Maximum Ratings table across all versions (D2102). This value is specific to the S3KB-K marking code and distinguishes it from adjacent variants like S3JB-K (600 V) and S3MB-K (1000 V). The S3KB-K must not be operated beyond this voltage in repetitive reverse-bias conditions.

Does the S3KB-K have a halogen-free construction?

Yes, the S3KB-K is halogen-free in accordance with IEC 61249-2-21, as explicitly stated in the FEATURES section. This applies to the molding compound and plating system, supporting environmentally regulated end equipment and reducing corrosive outgassing during soldering and field operation.

What is the forward voltage (V_F) of the S3KB-K at 3.0 A and 125°C?

The S3KB-K exhibits a typical forward voltage of 0.87 V at 3.0 A and 125°C, with a maximum of 0.99 V under those conditions. This data point is specified in the ELECTRICAL SPECIFICATIONS table and reflects reduced conduction loss at elevated temperatures compared to room-temperature operation.

Is the S3KB-K suitable for automated PCB assembly?

Yes, the S3KB-K is explicitly designed for automated placement, as noted in its FEATURES list. Its DO-214AA (SMB) package, matte tin-plated leads compliant with J-STD-002, and moisture sensitivity level 1 classification ensure reliable performance in high-volume SMT processes without baking or special handling.

What is the junction-to-ambient thermal resistance (R_θJA) of the S3KB-K?

The S3KB-K has an R_θJA of 78°C/W when mounted on a standard 10 mm × 10 mm copper pad, per the THERMAL PERFORMANCE table. This value assumes still air and is used to calculate steady-state junction temperature rise above ambient under given power dissipation conditions.

S3KB-K Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: DO-214AA, SMB

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 400 V

Current - Average Rectified (Io):: 3A

Voltage - Forward (Vf) (Max) @ If:: 1.15 V @ 3 A

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

Reverse Recovery Time (trr):: -

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

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: DO-214AA (SMB)

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

S3KB-K FAQ

1.How can I place an order for S3KB-K through Aetrix?

Please submit a Request for Quotation (RFQ) for S3KB-K 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 S3KB-K reliable?

The price and inventory of S3KB-K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for S3KB-K is usually 5 days.

3.What payment methods are accepted for S3KB-K?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for S3KB-K transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for S3KB-K?

S3KB-K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your S3KB-K 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 S3KB-K?

For technical support, including S3KB-K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your S3KB-K requirements.

6.How does Aetrix verify that S3KB-K is sourced from the original manufacturer or authorized distributors?

All S3KB-K 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 S3KB-K meets industry standards.

7.What is the process for return or replacement of S3KB-K?

All S3KB-K units undergo pre-shipment inspection (PSI). If there is an issue with S3KB-K, 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 S3KB-K part is unused and in its original packaging.

Return procedure for S3KB-K:

1.Submit a request within 90 days.

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

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