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

Diodes Incorporated US1A-13

Name: US1A-13
Brand: Diodes Incorporated
SKU: US1A-13
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: US1A-13

Manufacturer:: Diodes Incorporated

Category:: Single Diodes

Package:: DO-214AC, SMA

Datasheet:: US1A-13.pdf

Description:: ULTRAFAST SMA 50V 1A 50NS 150C

Quantity:: RFQ Add To RFQ list

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Inventory:4,839

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Product details

Overview

US1A-13 from Diodes Incorporated is a 1.0A surface-mount ultra-fast rectifier diode in SMA package, rated for 50V peak repetitive reverse voltage (V_RRM), 1.0V forward voltage drop at 1.0A (V_FM), and 50ns reverse recovery time (t_rr), used in high-frequency switching power supplies and AC/DC adapters.

For engineers reviewing the US1A-13 datasheet, US1A-13 pinout, US1A-13 application, or US1A-13 equivalent, key selection criteria include its ultra-fast recovery (50ns), low thermal resistance (30°C/W), RoHS-compliant matte tin plating, and suitability for automated SMT assembly in compact power conversion stages.

Technical Context

This device operates as a unidirectional current-conducting junction diode with glass-passivated die construction, enabling stable performance under repetitive surge conditions up to 30A (8.3ms half-sine). Its ultra-fast recovery minimizes switching losses in high-frequency rectification circuits above 20kHz.

The SMA package provides mechanical robustness and thermal dissipation capability (R_θJT = 30°C/W), while the cathode band polarity marking ensures correct orientation during automated placement. Reverse leakage remains ≤5.0µA at 25°C and ≤100µA at 100°C under rated blocking voltage.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	50 V - Maximum non-repetitive reverse voltage before breakdown; sets safe operating limit in flyback or boost converter output stages.
I_O	1.0 A - Average rectified current at T_T = +75°C; defines continuous DC output capability in SMPS secondary-side rectification.
t_rr	50 ns - Measured at I_F = 0.5A, I_R = 1.0A, I_rr = 0.25A; enables efficient operation in 100–500kHz switching topologies.
V_FM	1.0 V @ 1.0A - Forward voltage at rated DC current; directly impacts conduction loss and thermal design in low-voltage output rails.
I_FSM	30 A - Non-repetitive surge rating (8.3ms); supports inrush current handling during cold-start or line transients.
R_θJT	30 °C/W - Junction-to-terminal thermal resistance; determines temperature rise over ambient when mounted on PCB copper area.

Pinout & Package

SMA (DO-214AC) surface-mount package with molded plastic case (UL 94V-0), cathode band marking, and matte tin-plated terminals solderable per MIL-STD-202, Method 208.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Current entry terminal during forward conduction	Connected to transformer secondary or switch node; must withstand peak forward surge (30A) and thermal cycling.
Cathode	Current exit terminal during forward conduction; marked by band	Connected to output filter capacitor; polarity-sensitive placement required for correct rectification direction.

Key Features

Feature	Design Value
Glass passivated die	Enhances long-term reliability and moisture resistance without hermetic sealing; critical for industrial-grade power modules.
Ultra-fast recovery (50ns)	Reduces reverse recovery charge (Q_rr) and associated switching losses in high-frequency converters (>100kHz).
Lead-free, halogen-free "Green" construction	Meets RoHS 2 (2011/65/EU) and Diodes Inc.'s <900ppm Br/Cl, <1000ppm Sb requirements for eco-compliant manufacturing.
Automated assembly optimized	Standardized SMA footprint and tape-and-reel packaging (5,000/reel) support high-speed pick-and-place with >99.9% placement yield.

Applications

AC/DC Adapters

Switch-Mode Power Supplies

Use Scenario: Secondary-side rectification in 5–24V wall adapters for consumer electronics.

IC Role / Device Role / Timing Role: Ultra-fast discrete rectifier replacing slower standard diodes to reduce heat and improve efficiency.

Use Value: 50ns t_rr cuts switching loss by ~35% vs. 100ns diodes at 250kHz, enabling smaller heatsinks and higher power density.

Use Scenario: Output rectification in isolated DC-DC converters for telecom and industrial equipment.

IC Role / Device Role / Timing Role: High-current, low-V_F rectifier in synchronous or quasi-resonant topologies.

Use Value: 1.0V V_FM at 1.0A reduces conduction loss by 0.2W vs. 1.2V alternatives, lowering thermal stress on PCB layout.

LED Drivers

Automotive Infotainment Power Rails

Use Scenario: Bridge rectification in constant-current LED driver front-ends for indoor/outdoor lighting.

IC Role / Device Role / Timing Role: Input-stage ultra-fast diode handling 50/60Hz AC input with minimal ripple-induced heating.

Use Value: 30A I_FSM withstands lamp cold-start surges; glass passivation prevents degradation in humid environments.

Use Scenario: Auxiliary power supply rectification in head unit or display module power management units.

IC Role / Device Role / Timing Role: Compact, RoHS-compliant rectifier meeting automotive temperature (-40°C to +125°C ambient) and vibration specs.

Use Value: -65°C to +150°C T_J range and 30°C/W R_θJT ensure stable operation under under-hood thermal cycling.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH1L06S	600V V_RRM, 55ns t_rr, TO-277 package (lower R_θJA but larger footprint)	Higher voltage rating suits 400V PFC stages; not drop-in for 50V designs	Select only if system requires >100V blocking or improved thermal dissipation via stud mounting.
ON Semi MUR105	50V V_RRM, 75ns t_rr, DO-41 through-hole package	Larger size and manual assembly requirement; unsuitable for high-density SMT layouts	Use only for legacy through-hole designs where rework or prototyping favors axial leads.

Compared with STTH1L06S and MUR105, US1A-13 offers optimal balance of 50V rating, 50ns speed, and SMA footprint-enabling compact, automated, thermally efficient rectification where voltage stress is low and board space is constrained.

Availability

US1A-13 is available at Aetrix Electronics and suitable for AC/DC adapters, switch-mode power supplies, and LED drivers requiring stable component supply, consistent parametric performance, and full RoHS compliance.

Supply support for US1A-13 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-efficiency power management, signal integrity, and protection solutions.

The US1x series belongs to Diodes' ultra-fast rectifier product line, designed specifically for high-frequency switching power conversion where low forward voltage, fast recovery, and SMT manufacturability are essential.

FAQ

What is the maximum junction temperature for US1A-13?

The US1A-13 has an operating junction temperature range of –65°C to +150°C. Its thermal resistance (R_θJT = 30°C/W) means that at 1.0A average current and 1.0V forward drop, junction temperature rise above terminal temperature is approximately 30°C-well within safe limits when mounted on ≥1 cm² of 1oz copper.

Is US1A-13 suitable for use in automotive applications?

Yes-US1A-13 meets AEC-Q200 stress test recommendations for passive components and operates across –65°C to +150°C. Its halogen-free, RoHS-compliant construction and 30A surge rating make it appropriate for infotainment and body control module auxiliary power rails, provided board-level thermal design maintains T_J ≤ 150°C.

How does US1A-13 differ from standard recovery rectifiers like 1N4007?

US1A-13 features 50ns reverse recovery time versus 30µs for 1N4007-a 600× improvement-making it viable for >100kHz switching. It also delivers lower V_FM (1.0V vs. ~1.1V) and higher I_FSM (30A vs. 30A, but with faster thermal response due to SMA package).

Can US1A-13 be used in parallel for higher current handling?

No-parallel operation is not recommended without external balancing resistors or active current sharing. The US1A-13's V_F tolerance (±0.1V) and thermal coupling limitations can cause current imbalance; for >1.0A continuous loads, select a higher-rated part such as US2A-13 (2.0A) instead.

US1A-13 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: DO-214AC, SMA

Packaging:: Tape & Reel (TR)

Product Status:: Discontinued at Digi-Key

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 50 V

Current - Average Rectified (Io):: 1A

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

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

Reverse Recovery Time (trr):: 50 ns

Current - Reverse Leakage @ Vr:: 5 µA @ 50 V

Capacitance @ Vr, F:: 20pF @ 4V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SMA

Operating Temperature - Junction:: -65°C ~ 150°C

US1A-13 FAQ

1.How can I place an order for US1A-13 through Aetrix?

Please submit a Request for Quotation (RFQ) for US1A-13 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 US1A-13 reliable?

The price and inventory of US1A-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for US1A-13 is usually 5 days.

3.What payment methods are accepted for US1A-13?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for US1A-13 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for US1A-13?

US1A-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your US1A-13 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 US1A-13?

For technical support, including US1A-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your US1A-13 requirements.

6.How does Aetrix verify that US1A-13 is sourced from the original manufacturer or authorized distributors?

All US1A-13 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 US1A-13 meets industry standards.

7.What is the process for return or replacement of US1A-13?

All US1A-13 units undergo pre-shipment inspection (PSI). If there is an issue with US1A-13, 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 US1A-13 part is unused and in its original packaging.

Return procedure for US1A-13:

1.Submit a request within 90 days.

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

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