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

Taiwan Semiconductor Corporation SK33AH

Name: SK33AH
Brand: Taiwan Semiconductor Corporation
SKU: SK33AH
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SK33AH

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-214AC, SMA

Datasheet:: SK33AH.pdf

Description:: DIODE SCHOTTKY 30V 3A DO214AC

Quantity:: RFQ Add To RFQ list

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Inventory:8,529

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Product details

Overview

SK33AH from Taiwan Semiconductor is a 3A, 30V AEC-Q101-qualified Schottky barrier rectifier in DO-214AC (SMA) package, featuring 0.55V forward voltage at 3A/25°C, 70A surge current capability, and 150°C maximum junction temperature. It serves as a freewheeling or reverse-battery protection diode in automotive lighting and DC/DC converters.

For engineers reviewing the SK33AH datasheet, SK33AH pinout, SK33AH application, or SK33AH equivalent, key selection criteria include its 30V V_RRM, low VF for thermal efficiency, AEC-Q101 qualification for automotive use, and DO-214AC mechanical compatibility with automated SMT placement.

Technical Context

The SK33AH uses a single-die Schottky junction optimized for low forward voltage and fast switching, enabling high-efficiency operation in 20–100 kHz DC/DC topologies. Its guard ring structure provides over-voltage robustness, and moisture sensitivity level 1 ensures reflow compatibility without dry-pack requirements.

Thermal performance is defined by R_θJL = 25°C/W and R_θJA = 66°C/W, supporting continuous 3A conduction at ambient temperatures up to +85°C with standard PCB copper area. The cathode band marking and matte tin-plated leads comply with J-STD-002 solderability standards.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	30 V - Maximum repetitive reverse voltage; sets upper limit for safe blocking in 24V automotive systems
I_F	3 A - Continuous forward current rating; defines steady-state power handling in freewheeling paths
V_F @ 3A, 25°C	0.55 V - Low conduction loss; reduces power dissipation to ≤1.65W at full load
I_FSM	70 A - Non-repetitive surge rating; withstands inrush or fault currents in automotive load dumps
T_J max	150 °C - Junction temperature limit; enables operation in under-hood environments with margin
R_θJL	25 °C/W - Junction-to-lead thermal resistance; supports direct heat transfer to PCB copper or heatsink pad
I_R @ 30V, 25°C	500 μA - Low leakage; minimizes standby power loss in battery-critical applications

Pinout & Package

DO-214AC (SMA) surface-mount package with molded plastic body (UL 94V-0), matte tin-plated leads, and cathode polarity indicated by a visible band.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry	Connected to lower-potential node (e.g., switch node in buck converter)
Cathode	Forward current exit / reverse voltage reference	Marked by band; ties to output rail or ground return path

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan
Guard ring structure	Enhances edge termination robustness against transient over-voltage events without derating
Moisture sensitivity level 1	Zero bake requirement before reflow; compatible with standard J-STD-020 profile
Halogen-free & RoHS compliant	Meets EU Directive 2011/65/EU and IEC 61249-2-21 for environmentally restricted substances
High surge current capability	70A I_FSM supports 8.3ms half-sine surges common in automotive load-dump transients

Applications

Automotive LED Lighting	12V DC/DC Buck Converter
Use Scenario: Reverse polarity protection for headlamp or DRL modules powered from vehicle battery. IC Role / Device Role / Timing Role: Discrete Schottky rectifier used as series-blocking diode on input rail. Use Value: 0.55V V_F limits voltage drop to <0.6V at 3A, preserving >95% of supply voltage for LED drivers.	Use Scenario: Freewheeling path in synchronous or non-synchronous buck regulator supplying infotainment SoC rails. IC Role / Device Role / Timing Role: Uncontrolled rectifier providing low-loss current recirculation during high-side FET off-time. Use Value: 70A I_FSM handles peak inductor current surges during startup or overload without failure.
Reverse Battery Protection	Low-Voltage Inverter Output Stage
Use Scenario: Input protection circuit preventing damage when jumper cables are incorrectly connected. IC Role / Device Role / Timing Role: Series-connected Schottky diode blocking reverse current flow into system electronics. Use Value: 30V V_RRM exceeds 24V nominal battery systems with margin for ISO 7637-2 pulse 1 (−100V/50ms), while low V_F avoids excessive heating.	Use Scenario: Output rectification in 24V-to-48V bi-directional LLC resonant inverter for mild-hybrid 48V systems. IC Role / Device Role / Timing Role: High-frequency unidirectional rectifier operating at 50–100 kHz switching frequency. Use Value: Fast recovery and low Q_rr (inferred from Schottky architecture) minimize switching losses and EMI generation.

Automotive LED Lighting

12V DC/DC Buck Converter

Use Scenario: Reverse polarity protection for headlamp or DRL modules powered from vehicle battery.

IC Role / Device Role / Timing Role: Discrete Schottky rectifier used as series-blocking diode on input rail.

Use Value: 0.55V V_F limits voltage drop to <0.6V at 3A, preserving >95% of supply voltage for LED drivers.

Use Scenario: Freewheeling path in synchronous or non-synchronous buck regulator supplying infotainment SoC rails.

IC Role / Device Role / Timing Role: Uncontrolled rectifier providing low-loss current recirculation during high-side FET off-time.

Use Value: 70A I_FSM handles peak inductor current surges during startup or overload without failure.

Reverse Battery Protection

Low-Voltage Inverter Output Stage

Use Scenario: Input protection circuit preventing damage when jumper cables are incorrectly connected.

IC Role / Device Role / Timing Role: Series-connected Schottky diode blocking reverse current flow into system electronics.

Use Value: 30V V_RRM exceeds 24V nominal battery systems with margin for ISO 7637-2 pulse 1 (−100V/50ms), while low V_F avoids excessive heating.

Use Scenario: Output rectification in 24V-to-48V bi-directional LLC resonant inverter for mild-hybrid 48V systems.

IC Role / Device Role / Timing Role: High-frequency unidirectional rectifier operating at 50–100 kHz switching frequency.

Use Value: Fast recovery and low Q_rr (inferred from Schottky architecture) minimize switching losses and EMI generation.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Vishay VS-3EY30-M3/57T	Same 3A/30V rating, but VF = 0.52V (typ) at 3A; slightly lower R_θJA = 60°C/W	Identical AEC-Q101 qualification; identical DO-214AC footprint	Preferred where sub-0.53V VF is critical for ultra-low-loss designs
ON Semiconductor SB330	VF = 0.54V (max) at 3A; I_FSM = 60A; no AEC-Q101 documentation confirmed	Used in industrial DC/DC; not validated for automotive temperature cycling or humidity testing	Select only for non-automotive applications requiring cost-sensitive sourcing

Compared with VS-3EY30-M3/57T and SB330, the SK33AH offers verified AEC-Q101 compliance and tighter VF consistency (0.55V typ) across production lots, making it the preferred choice for automotive lighting and battery-protection circuits where qualification traceability is mandatory.

Availability

SK33AH is available at Aetrix Electronics and suitable for automotive LED lighting, 12V DC/DC converters, and reverse battery protection circuits requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant sourcing.

Supply support for SK33AH 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 devices, rectifiers, and protection components.

The SK33AH belongs to TSC's AEC-Q101-qualified SKxAH Schottky rectifier family, designed specifically for automotive power conversion and protection applications demanding high surge robustness and low conduction loss.

FAQ

What is the maximum junction temperature rating for the SK33AH?

The SK33AH has a maximum junction temperature (T_J) rating of +150°C, verified per absolute maximum ratings table. This allows reliable operation in under-hood automotive environments when mounted on PCBs with adequate copper area. Thermal design must ensure that actual T_J remains below this limit under worst-case ambient and power dissipation conditions. The SK33AH's R_θJL of 25°C/W supports effective heat transfer to the PCB lead frame.

Is the SK33AH suitable for reverse battery protection in 24V commercial vehicles?

Yes, the SK33AH is suitable for reverse battery protection in 24V commercial vehicles. Its 30V V_RRM provides margin above nominal 24V systems and withstands ISO 7637-2 pulse 1 (−100V/50ms) when combined with appropriate clamping. The 0.55V forward voltage at 3A ensures minimal voltage drop and power loss, while AEC-Q101 qualification confirms robustness across automotive temperature and vibration profiles. The SK33AH's guard ring further enhances transient over-voltage tolerance.

Does the SK33AH have a specified reverse recovery time (t_rr)?

No, the SK33AH does not specify reverse recovery time (t_rr) because it is a Schottky barrier diode, which operates via majority-carrier conduction and exhibits negligible stored charge. Instead, its fast switching behavior is characterized by low junction capacitance (typ. 100–200 pF at 4V, per curve Fig.2) and absence of minority-carrier tail current. This makes the SK33AH inherently suitable for high-frequency DC/DC converters where t_rr-related losses would otherwise degrade efficiency.

What packaging and reel quantity is offered for the SK33AH?

The SK33AH is supplied in DO-214AC (SMA) package on 7,500-piece tape-and-reel format, per ordering code SK33AH and manufacturer's packing specification. The reel complies with EIA-481-D standards and includes moisture barrier bagging per J-STD-020 Level 1 requirements-no dry-pack or baking needed prior to SMT assembly. Each reel label carries full traceability including lot code, date code (YW), and factory code (F).

How does the SK33AH compare to the SK32AH in terms of electrical performance?

The SK33AH and SK32AH share identical forward characteristics (I_F = 3A, V_F = 0.55V typ at 3A/25°C, I_FSM = 70A), thermal specs (R_θJL = 25°C/W), and package (DO-214AC). Their sole difference is peak reverse voltage: SK32AH is rated at 20V V_RRM, while SK33AH is rated at 30V V_RRM. This makes the SK33AH appropriate for 24V systems with higher transient margins, whereas SK32AH suits tightly regulated 12V applications where lower V_RRM improves leakage performance.

SK33AH Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: DO-214AC, SMA

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Schottky

Voltage - DC Reverse (Vr) (Max):: 30 V

Current - Average Rectified (Io):: 3A

Voltage - Forward (Vf) (Max) @ If:: 550 mV @ 3 A

Speed:: Fast Recovery =< 500ns, > 200mA (Io)

Reverse Recovery Time (trr):: -

Current - Reverse Leakage @ Vr:: 500 µA @ 30 V

Capacitance @ Vr, F:: -

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: DO-214AC (SMA)

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

SK33AH FAQ

1.How can I place an order for SK33AH through Aetrix?

Please submit a Request for Quotation (RFQ) for SK33AH 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 SK33AH reliable?

The price and inventory of SK33AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SK33AH is usually 5 days.

3.What payment methods are accepted for SK33AH?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SK33AH transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SK33AH?

SK33AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SK33AH 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 SK33AH?

For technical support, including SK33AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SK33AH requirements.

6.How does Aetrix verify that SK33AH is sourced from the original manufacturer or authorized distributors?

All SK33AH 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 SK33AH meets industry standards.

7.What is the process for return or replacement of SK33AH?

All SK33AH units undergo pre-shipment inspection (PSI). If there is an issue with SK33AH, 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 SK33AH part is unused and in its original packaging.

Return procedure for SK33AH:

1.Submit a request within 90 days.

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

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