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

Taiwan Semiconductor Corporation SS520ALH

Name: SS520ALH
Brand: Taiwan Semiconductor Corporation
SKU: SS520ALH
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SS520ALH

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-221AC, SMA Flat Leads

Datasheet:: SS520ALH.pdf

Description:: 5A, 200V, SCHOTTKY RECTIFIER

Quantity:: RFQ Add To RFQ list

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Inventory:9,932

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Product details

Overview

SS520ALH from Taiwan Semiconductor is a 5A, 200V Schottky barrier surface-mount rectifier in Thin SMA package, featuring 0.84V forward voltage at 5A/25°C, 100pF junction capacitance, 110A surge current rating, and AEC-Q101 qualification for automotive-grade reliability. It serves as a high-efficiency output rectifier in DC/DC converters and SMPS where low conduction loss and fast switching are critical.

For engineers reviewing the SS520ALH datasheet, SS520ALH pinout, SS520ALH application, or SS520ALH equivalent, key selection criteria include its 200V reverse voltage rating, thermal resistance (R_θJL = 17°C/W), moisture sensitivity level 1 compliance, and cathode-band polarity marking-essential for layout, thermal design, and automotive qualification validation.

Technical Context

The SS520ALH implements a single-die Schottky junction optimized for high-voltage (200V V_RRM) operation while maintaining low forward voltage-achieved via tailored metal-semiconductor interface and thin epitaxial layer design. Its 100pF junction capacitance at 1MHz/4V enables reduced switching losses in high-frequency converters.

Thermal performance is defined by R_θJL = 17°C/W and R_θJA = 78°C/W on a 5mm × 5mm Cu pad PCB, supporting continuous 5A operation up to 125°C junction temperature. The device meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity requirements.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	200 V - Maximum repetitive reverse blocking voltage; defines safe operating range in high-side rectification circuits
I_F	5 A - Continuous forward current rating; supports compact power stage designs without forced air cooling
V_F @ 5A, 25°C	0.84 V (max 0.95 V) - Low conduction loss directly reduces power dissipation and improves system efficiency
I_FSM	110 A - Peak non-repetitive surge current capability; withstands inrush and transient overloads in adapter applications
C_J	100 pF - Junction capacitance at 1MHz/4V; enables faster reverse recovery and lower EMI in >100kHz switching topologies
T_J max	+150 °C - Maximum junction temperature; allows operation in under-hood automotive environments with derating
R_θJL	17 °C/W - Junction-to-lead thermal resistance; enables direct thermal coupling to PCB copper for passive heat spreading

Pinout & Package

Package: Thin SMA (Surface Mount Assembly), molded UL 94V-0 compound, matte tin-plated leads, cathode indicated by band. Weight: 0.028 g.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to lower-potential node (e.g., switch node in buck converter); requires adequate copper area for thermal conduction
Cathode	Forward current exit / reverse voltage blocking terminal	Marked by band; connects to output rail; must maintain clearance from adjacent high-dV/dt traces per 200V rating

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive electronics per stress test requirements-enables use in engine control, ADAS, and infotainment power rails
Low forward voltage at high temperature	V_F = 0.70 V @ 5A/125°C-reduces thermal runaway risk and maintains efficiency across full industrial temperature range
Moisture sensitivity level 1	No floor life limitation or bake requirement before reflow-simplifies SMT line handling and eliminates pre-process delays
High surge current capability	285 A @ 1ms pulse-survives cold-start surges and capacitor charging transients in 12V/24V vehicle systems
Halogen-free construction	Complies with IEC 61249-2-21-meets environmental compliance mandates for EU, China, and Japan automotive supply chains

Applications

On-board DC/DC Converter	Automotive Lighting Driver
Use Scenario: 12V-to-5V/3.3V buck converter powering microcontrollers and sensors in body control modules. IC Role / Device Role / Timing Role: Output synchronous rectifier replacing MOSFETs in cost-sensitive designs; handles 5A continuous load with minimal heatsinking. Use Value: 0.84V V_F reduces conduction loss by ~30% vs. standard silicon diodes, lowering thermal stress on PCB and enabling smaller form factors.	Use Scenario: LED headlamp driver with PWM dimming and overvoltage protection in passenger vehicles. IC Role / Device Role / Timing Role: Freewheeling diode across inductive LED current path during switch-off transitions. Use Value: 200V V_RRM and 110A I_FSM ensure robustness against load dump transients (ISO 7637-2 Pulse 5a) without clamping circuitry.
Industrial SMPS Secondary Rectifier	AC-DC Adapter Output Stage
Use Scenario: 48V-output telecom power supply operating at 200–500 kHz switching frequency. IC Role / Device Role / Timing Role: High-frequency secondary-side rectifier leveraging low C_J (100 pF) to minimize switching losses and EMI generation. Use Value: 100pF capacitance cuts reverse recovery charge vs. SS515ALH (126 pF), reducing dv/dt-induced ringing and improving EMC margin.	Use Scenario: 19V/3.42A laptop adapter with universal input (90–264 VAC). IC Role / Device Role / Timing Role: Primary-side auxiliary supply rectifier and secondary-side output rectifier in dual-stage topology. Use Value: AEC-Q101 qualification and Level 1 MSL rating ensure reliability through multiple reflow cycles and long-term field operation in consumer infrastructure.

On-board DC/DC Converter

Automotive Lighting Driver

Use Scenario: 12V-to-5V/3.3V buck converter powering microcontrollers and sensors in body control modules.

IC Role / Device Role / Timing Role: Output synchronous rectifier replacing MOSFETs in cost-sensitive designs; handles 5A continuous load with minimal heatsinking.

Use Value: 0.84V V_F reduces conduction loss by ~30% vs. standard silicon diodes, lowering thermal stress on PCB and enabling smaller form factors.

Use Scenario: LED headlamp driver with PWM dimming and overvoltage protection in passenger vehicles.

IC Role / Device Role / Timing Role: Freewheeling diode across inductive LED current path during switch-off transitions.

Use Value: 200V V_RRM and 110A I_FSM ensure robustness against load dump transients (ISO 7637-2 Pulse 5a) without clamping circuitry.

Industrial SMPS Secondary Rectifier

AC-DC Adapter Output Stage

Use Scenario: 48V-output telecom power supply operating at 200–500 kHz switching frequency.

IC Role / Device Role / Timing Role: High-frequency secondary-side rectifier leveraging low C_J (100 pF) to minimize switching losses and EMI generation.

Use Value: 100pF capacitance cuts reverse recovery charge vs. SS515ALH (126 pF), reducing dv/dt-induced ringing and improving EMC margin.

Use Scenario: 19V/3.42A laptop adapter with universal input (90–264 VAC).

IC Role / Device Role / Timing Role: Primary-side auxiliary supply rectifier and secondary-side output rectifier in dual-stage topology.

Use Value: AEC-Q101 qualification and Level 1 MSL rating ensure reliability through multiple reflow cycles and long-term field operation in consumer infrastructure.

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-50WQ03FN-M3/45	30V V_RRM, 5A, 0.41V V_F @ 5A - lower voltage, lower V_F, TO-220AC package	Not suitable for 200V blocking; requires heatsink; incompatible with Thin SMA footprint	Select only for low-voltage (<40V), high-efficiency, thermally unconstrained designs
ON Semiconductor SB5200-E3/54	200V V_RRM, 5A, 0.87V V_F @ 5A - same voltage rating, higher V_F, SMA package	Compatible footprint but 30mV higher conduction loss; no AEC-Q101 qualification	Acceptable for industrial non-automotive use where qualification is not required and minor efficiency trade-off is acceptable

Compared with VS-50WQ03FN-M3/45 and SB5200-E3/54, the SS520ALH uniquely combines 200V rating, AEC-Q101 qualification, Thin SMA packaging, and 0.84V V_F-making it the only option among the three qualified for automotive under-hood DC/DC converters requiring zero MSL restrictions and high surge immunity.

Availability

SS520ALH is available at Aetrix Electronics and suitable for automotive lighting drivers, on-board DC/DC converters, and industrial SMPS requiring stable component supply, AEC-Q101 compliance, and lead-free halogen-free manufacturing.

Supply support for SS520ALH 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 semiconductor manufacturer specializing in discrete power devices, including rectifiers, TVS diodes, and MOSFETs, with global distribution and automotive qualification capabilities.

The SS520ALH belongs to TSC's SS5xALH Schottky rectifier family, engineered specifically for high-reliability automotive and industrial power conversion where high-voltage blocking, low forward drop, and robust surge tolerance are mandatory.

FAQ

What is the maximum junction temperature rating for the SS520ALH?

The SS520ALH has a maximum junction temperature (T_J) of +150°C, verified per absolute maximum ratings in the official datasheet. This rating allows sustained operation in under-hood automotive environments when used with appropriate PCB copper area and thermal derating. The SS520ALH must be operated within this limit to maintain reliability and AEC-Q101 qualification integrity.

Is the SS520ALH pin-compatible with other parts in the SS5xALH series?

Yes-the SS520ALH shares identical Thin SMA package dimensions, pinout, and cathode band polarity with SS54ALH through SS515ALH. All variants use the same mechanical outline and solder pad layout, enabling voltage-scaling design reuse across 40V–200V ratings without PCB revision. The SS520ALH marking code "520ALH" distinguishes it visually on the device body.

Does the SS520ALH require moisture baking before reflow soldering?

No-the SS520ALH is rated Moisture Sensitivity Level 1 per J-STD-020, meaning it has unlimited floor life and does not require dry-pack storage or pre-reflow baking. This simplifies SMT line logistics and eliminates process steps that could compromise the SS520ALH's matte tin plating or molding compound integrity.

What is the reverse leakage current of the SS520ALH at 125°C?

At rated reverse voltage and T_J = 125°C, the SS520ALH exhibits a maximum reverse leakage current (I_R) of 1 mA, as specified in the electrical characteristics table. This value is significantly lower than lower-voltage variants (e.g., SS54ALH: 40 mA), reflecting tighter junction control for high-V_RRM stability. Designers should verify thermal design ensures T_J stays within limits to avoid exceeding this leakage.

How does the SS520ALH's junction capacitance affect high-frequency performance?

The SS520ALH has a typical junction capacitance (C_J) of 100 pF at 1 MHz and 4 V reverse bias. This low capacitance minimizes displacement current during switching transitions, reducing EMI generation and improving efficiency in converters operating above 200 kHz. Compared to SS515ALH (126 pF), the SS520ALH's lower C_J delivers measurably cleaner turn-off waveforms in the same layout.

SS520ALH 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:: Schottky

Voltage - DC Reverse (Vr) (Max):: 200 V

Current - Average Rectified (Io):: 5A

Voltage - Forward (Vf) (Max) @ If:: 950 mV @ 5 A

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

Reverse Recovery Time (trr):: -

Current - Reverse Leakage @ Vr:: 10 µA @ 200 V

Capacitance @ Vr, F:: 100pF @ 4V, 1MHz

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: Thin SMA

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

SS520ALH FAQ

1.How can I place an order for SS520ALH through Aetrix?

Please submit a Request for Quotation (RFQ) for SS520ALH 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 SS520ALH reliable?

The price and inventory of SS520ALH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SS520ALH is usually 5 days.

3.What payment methods are accepted for SS520ALH?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SS520ALH transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SS520ALH?

SS520ALH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SS520ALH 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 SS520ALH?

For technical support, including SS520ALH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SS520ALH requirements.

6.How does Aetrix verify that SS520ALH is sourced from the original manufacturer or authorized distributors?

All SS520ALH 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 SS520ALH meets industry standards.

7.What is the process for return or replacement of SS520ALH?

All SS520ALH units undergo pre-shipment inspection (PSI). If there is an issue with SS520ALH, 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 SS520ALH part is unused and in its original packaging.

Return procedure for SS520ALH:

1.Submit a request within 90 days.

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

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