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

Taiwan Semiconductor Corporation SS1H4LS

Name: SS1H4LS
Brand: Taiwan Semiconductor Corporation
SKU: SS1H4LS
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SS1H4LS

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: SOD-123H

Datasheet:: SS1H4LS.pdf

Description:: 1A, 40V, SCHOTTKY RECTIFIER

Quantity:: RFQ Add To RFQ list

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Inventory:8,757

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Product details

Overview

SS1H4LS from Taiwan Semiconductor is a 1A, 40V Schottky barrier surface-mount rectifier in SOD-123HE package, featuring 0.65V max forward voltage at 1A/25°C, 30A peak surge current, and ultra-low 1.0µA reverse leakage at 25°C - optimized for high-efficiency DC-DC converters and compact AC-DC adapters.

For engineers reviewing the SS1H4LS datasheet, SS1H4LS pinout, SS1H4LS application, or SS1H4LS equivalent, key selection criteria include its 40V V_RRM, SOD-123HE thermal resistance (R_θJL = 20°C/W), cathode-band polarity marking, and J-STD-020 Level 1 moisture sensitivity rating.

Technical Context

This Schottky rectifier uses a single-die construction with low-barrier metal-semiconductor junction to minimize forward conduction loss and enable fast switching without minority-carrier recovery. Its 0.65V V_F at 1A directly reduces power dissipation versus silicon PN diodes in high-frequency SMPS outputs.

The SOD-123HE package delivers 72°C/W junction-to-ambient thermal resistance and supports automated placement with <0.85mm profile. Polarity is unambiguously indicated by a cathode band, and terminals meet J-STD-002 solderability and JESD201 Class 2 whisker resistance requirements.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	40 V - maximum repetitive reverse blocking voltage; defines safe operating range in 36–42V input rails
I_F	1 A continuous - rated average forward current at 75°C lead temperature; supports 5–12W DC-DC output stages
V_F @ 1A	≤0.65 V - low conduction loss enables >92% efficiency in 5V/1A buck converter outputs
I_R @ 25°C	≤1.0 µA - minimal leakage preserves standby power in always-on adapter circuits
I_FSM	30 A - withstands 8.3ms line surges common in universal-input offline SMPS
T_J max	+150°C - allows operation in thermally constrained enclosed power supplies
R_θJL	20 °C/W - enables direct heat transfer to PCB copper, reducing need for thermal vias

Pinout & Package

SOD-123HE surface-mount package with 2-terminal configuration: anode and cathode. Matte tin-plated leads ensure reliable solder joint formation per J-STD-002; polarity marked by visible cathode band on body.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to lower-potential side (e.g., switch node in synchronous buck); must route with low-inductance trace
Cathode	Forward current exit / reverse blocking terminal	Connected to output rail; cathode band identifies this terminal for correct PCB orientation and automated optical inspection

Key Features

Feature	Design Value
Ultra-low forward voltage	V_F ≤ 0.65 V at 1A/25°C reduces conduction loss by ~40% vs. comparable 1A silicon rectifiers
High surge robustness	30A I_FSM withstands repeated 8.3ms half-sine surges without degradation in 115/230VAC input stages
Low-profile packaging	SOD-123HE height < 0.85 mm enables use in space-constrained USB-C PD adapters and slim IoT power modules
Moisture resilience	J-STD-020 Level 1 rating eliminates bake requirement before reflow, simplifying SMT line integration
Halogen-free compliance	Meets IEC 61249-2-21, supporting RoHS-compliant industrial and consumer end-equipment certifications

Applications

Switching Mode Power Supply (SMPS)	USB-C Power Adapter
Use Scenario: Secondary-side rectification in 36–48V output flyback or forward converters delivering up to 12W. IC Role / Device Role / Timing Role: Uncontrolled rectifier replacing synchronous MOSFETs where cost and simplicity outweigh marginal efficiency gains. Use Value: 0.65V V_F minimizes conduction loss while enabling compact heatsinkless design under full load.	Use Scenario: Output rectification in ultra-thin 20–30W USB-C PD wall adapters with height constraint <12mm. IC Role / Device Role / Timing Role: High-frequency freewheeling diode in quasi-resonant flyback topology operating at 65–130kHz. Use Value: SOD-123HE's <0.85mm profile and 20°C/W R_θJL allow direct thermal coupling to ground plane, eliminating discrete thermal pads.
DC-DC Buck Converter	Industrial Sensor Node Power
Use Scenario: Freewheeling path in 5–12V input, 3.3V/1A buck regulators powering FPGA I/O banks or microcontroller peripherals. IC Role / Device Role / Timing Role: Low-loss续流 diode synchronized with high-side switch dead-time; no reverse recovery delay. Use Value: Schottky architecture eliminates reverse recovery charge (Q_rr ≈ 0), reducing EMI and improving light-load efficiency.	Use Scenario: Input protection and reverse-polarity safeguard in battery-powered wireless sensor nodes using Li-ion or 2xAA primary cells. IC Role / Device Role / Timing Role: Reverse-blocking element placed between battery connector and PMIC input, preventing damage during hot-plug or misinsertion. Use Value: 1.0µA max I_R at 25°C ensures <1µW standby drain, extending shelf life of sealed sensor units beyond 10 years.

Switching Mode Power Supply (SMPS)

USB-C Power Adapter

Use Scenario: Secondary-side rectification in 36–48V output flyback or forward converters delivering up to 12W.

IC Role / Device Role / Timing Role: Uncontrolled rectifier replacing synchronous MOSFETs where cost and simplicity outweigh marginal efficiency gains.

Use Value: 0.65V V_F minimizes conduction loss while enabling compact heatsinkless design under full load.

Use Scenario: Output rectification in ultra-thin 20–30W USB-C PD wall adapters with height constraint <12mm.

IC Role / Device Role / Timing Role: High-frequency freewheeling diode in quasi-resonant flyback topology operating at 65–130kHz.

Use Value: SOD-123HE's <0.85mm profile and 20°C/W R_θJL allow direct thermal coupling to ground plane, eliminating discrete thermal pads.

DC-DC Buck Converter

Industrial Sensor Node Power

Use Scenario: Freewheeling path in 5–12V input, 3.3V/1A buck regulators powering FPGA I/O banks or microcontroller peripherals.

IC Role / Device Role / Timing Role: Low-loss续流 diode synchronized with high-side switch dead-time; no reverse recovery delay.

Use Value: Schottky architecture eliminates reverse recovery charge (Q_rr ≈ 0), reducing EMI and improving light-load efficiency.

Use Scenario: Input protection and reverse-polarity safeguard in battery-powered wireless sensor nodes using Li-ion or 2xAA primary cells.

IC Role / Device Role / Timing Role: Reverse-blocking element placed between battery connector and PMIC input, preventing damage during hot-plug or misinsertion.

Use Value: 1.0µA max I_R at 25°C ensures <1µW standby drain, extending shelf life of sealed sensor units beyond 10 years.

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-1EQH04HM3	Same 40V V_RRM, 1A I_F, but SOD-123 package (not HE); R_θJA = 110°C/W vs. 72°C/W	Higher thermal resistance limits power density in compact layouts; requires larger copper area for same T_J	Prefer SS1H4LS where board space or thermal performance is constrained
ON Semiconductor SB140	40V V_RRM, 1A I_F, DO-214AA package; V_F = 0.55V typ but 1.2mm height vs. 0.85mm	DO-214AA footprint incompatible with SOD-123HE land pattern; taller profile conflicts with low-profile enclosures	Choose SS1H4LS for automated SMT lines targeting ultra-thin form factors

Compared with VS-1EQH04HM3 and SB140, the SS1H4LS delivers superior thermal performance in minimal volume via SOD-123HE's 20°C/W R_θJL and sub-0.85mm height - critical for next-generation compact power designs where layout density and thermal headroom are limiting factors.

Availability

SS1H4LS is available at Aetrix Electronics and suitable for switching mode power supplies, USB-C adapters, and DC-DC buck converters requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.

Supply support for SS1H4LS 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 management and industrial markets since 1979.

The SS1H4LS belongs to TSC's SOD-123HE Schottky rectifier family, engineered specifically for high-efficiency, space-constrained AC-DC and DC-DC conversion in consumer and industrial power supplies.

FAQ

What is the maximum junction temperature rating for the SS1H4LS?

The SS1H4LS has a maximum junction temperature (T_J) rating of +150°C, verified per absolute maximum ratings in the official Taiwan Semiconductor datasheet. This allows reliable operation in enclosed power supplies where ambient temperatures reach 70–85°C, provided thermal design maintains junction temperature below this limit. The SS1H4LS achieves this with R_θJL = 20°C/W, enabling efficient heat transfer to PCB copper.

Does the SS1H4LS have a specified moisture sensitivity level (MSL)?

Yes, the SS1H4LS is rated MSL Level 1 per J-STD-020, meaning it may be stored indefinitely at ≤30°C/85% RH and does not require baking prior to reflow soldering. This simplifies SMT line handling and eliminates yield risk from moisture-induced popcorning - a key advantage over higher-MSL alternatives like many SOIC-packaged diodes.

What is the forward voltage specification for SS1H4LS at 1A and 125°C?

The SS1H4LS forward voltage is not explicitly specified at 125°C in the provided datasheet; only the 25°C condition (V_F ≤ 0.65 V at I_F = 1A) and reverse current values at elevated temperature are given. Engineers should consult the "Typical Forward Characteristics" curve (Fig.4) in the SS1H4LS – SS1H20LS datasheet to interpolate V_F behavior across temperature, noting that V_F decreases ~2 mV/°C for Schottky devices.

Is the SS1H4LS pin-compatible with other parts in the SS1HxLS series?

Yes, all SS1HxLS variants (SS1H4LS through SS1H20LS) share identical SOD-123HE package dimensions, pinout, and thermal characteristics - only V_RRM and associated parameters (e.g., V_F, I_R) differ. This allows drop-in voltage-scaling during design validation or BOM optimization without layout changes, provided the selected variant meets the circuit's reverse voltage stress requirements.

What marking code appears on the SS1H4LS device body?

The SS1H4LS is marked with "1H4LS" on its top surface, as confirmed in the Absolute Maximum Ratings table of the Taiwan Semiconductor datasheet. This 5-character laser marking distinguishes it from other members of the SS1HxLS family (e.g., "1H6LS" for SS1H6LS) and aligns with industry-standard SOD-123HE marking practices for automated optical inspection and traceability.

SS1H4LS Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: SOD-123H

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Schottky

Voltage - DC Reverse (Vr) (Max):: 40 V

Current - Average Rectified (Io):: 1A

Voltage - Forward (Vf) (Max) @ If:: 650 mV @ 1 A

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

Reverse Recovery Time (trr):: -

Current - Reverse Leakage @ Vr:: 1 µA @ 40 V

Capacitance @ Vr, F:: -

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOD-123HE

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

SS1H4LS FAQ

1.How can I place an order for SS1H4LS through Aetrix?

Please submit a Request for Quotation (RFQ) for SS1H4LS 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 SS1H4LS reliable?

The price and inventory of SS1H4LS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SS1H4LS is usually 5 days.

3.What payment methods are accepted for SS1H4LS?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SS1H4LS transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SS1H4LS?

SS1H4LS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SS1H4LS 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 SS1H4LS?

For technical support, including SS1H4LS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SS1H4LS requirements.

6.How does Aetrix verify that SS1H4LS is sourced from the original manufacturer or authorized distributors?

All SS1H4LS 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 SS1H4LS meets industry standards.

7.What is the process for return or replacement of SS1H4LS?

All SS1H4LS units undergo pre-shipment inspection (PSI). If there is an issue with SS1H4LS, 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 SS1H4LS part is unused and in its original packaging.

Return procedure for SS1H4LS:

1.Submit a request within 90 days.

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

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