US1A-US1M - 1.0A SURFACE MOUNT ULTRA-FAST RECTIFIER - Datasheet

Q: What are the key features of the US1A-US1M rectifier?

It uses glass passivated die construction with ultra-fast recovery time for high efficiency, supports surge overload up to 30A peak, and is suited for automated assembly. It also offers lead-free finish and “Green” compliance (halogen and antimony free).

Q: How are the device variants and ordering codes structured?

The part number format is US1x-13-F for SMA packaging with 5,000 per tape and reel. Here, x denotes the device type (e.g., US1A-13-F), and US1x also maps to the product type marking code.

Q: What electrical and thermal parameters are provided for selecting the correct operating conditions?

The datasheet lists maximum ratings such as peak repetitive reverse voltage (VRRM), RMS reverse voltage, and forward surge current, plus thermal resistance (junction to terminal) and operating/storage temperature range. Electrical characteristics include forward voltage drop at specified forward currents, reverse current at blocking voltage, reverse recovery time, and typical total capacitance.

Oct 12, 2026

Upload by nayy☆

US1A-US1M is a 1.0A surface-mount ultra-fast rectifier in SMA case designed for high-efficiency applications. It features glass passivated die construction, ultra-fast recovery for reduced switching losses, and surge overload capability up to 30A peak. The datasheet specifies ordering codes (US1x-13-F), lead-free/halogen-and-antimony-free “Green” compliance, polarity markings, thermal limits, electrical parameters (VRRM/VRWM/VR, IRM, trr), and capacitance values for device variants including US1A through US1M.

LanguageEnglish

CategoryTechnology

FormatPDF

Pages5

Reading Time13 min

AccessFree to download

Features

Mechanical Data

Ordering Information

Marking Information

Maximum Ratings

Thermal Characteristics

Electrical Characteristics

Package Outline Dimensions

Suggested Pad Layout

Important Notice

US1A-US1M 1.0A SURFACE MOUNT ULTRA-FAST RECTIFIER Features 􀁸 Glass Passivated Die Construction 􀁸 Ultra-Fast Recovery Time for High Efficiency 􀁸 Surge Overload Rating to 30A Peak 􀁸 High Current Capability 􀁸 Ideally Suited for Automated Assembly 􀁸 Lead-Free Finish; RoHS Compliant (Note 1) 􀁸 Halogen and Antimony Free.“Green” Device (Note 2) Top View Mechanical Data 􀁸 Case: SMA 􀁸 Case Material: Molded Plastic. UL Flammability Classification Rating 94V-0 􀁸 Moisture Sensitivity: Level 1 per J-STD-020 􀁸 Terminals: Lead Free Plating (Matte Tin Finish) . Solderable per MIL-STD-202, Method 208 􀁸 Polarity: Cathode Band or Cathode Notch 􀁸 Weight: 0.064 grams (Approximate) Bottom View Ordering Information (Note 3) | Part Number* | Case | Packaging | | --- | --- | --- | | US1x-13-F | SMA | 5,000/Tape & Reel | *x = Device type, e.g. US1A-13-F. Notes: 1. EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. All applicable RoHS exemptions applied. 2. See [http://www.diodes.com/quality/lead_free.html](http://www.diodes.com/quality/lead_free.html) for more information about Diodes Incorporated’s definitions of Halogen-and Antimony-free, "Green"and Lead-free. 3. Halogen-and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and <1000ppm antimony compounds. Marking Information | | YWW
US1x | | | --- | --- | --- | US1x = Product Type Marking Code, ex: US1A = Manufacturers’ Code Marking YWW = Date Code Marking Y = Last Digit of Year (ex: 4 for 2014) WW = Week Code (01 to 53) US1A-US1M Document number: DS16008 Rev. 11-2 1 of 5 [www.diodes.com](www.diodes.com) December 2014 © Diodes Incorporated US1A-US1M Maximum Ratings (@TA = +25°C unless otherwise specified. ) Single phase, half wave, 60Hz, resistive or inductive load. For capacitance load, derate current by 20% . | Characteristic | Symbol | US1A | US1B | US1D | US1G | US1J | US1K | US1M | Unit | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | Peak Repetitive Reverse Voltage
Working Peak Reverse Voltage
DC Blocking Voltage (Note 4) | VRRM
VRWM
VR | 50 | 100 | 200 | 400 | 600 | 800 | 1000 | V | | RMS Reverse Voltage | VR(RMS) | 35 | 70 | 140 | 280 | 420 | 560 | 700 | V | | Average Rectified Output Current @ TT = +75°C | IO | 1.0 | | | | | | | A | | Non-Repetitive Peak Forward Surge Current 8.3ms Single Half Sine-Wave Superimposed on Rated Load | IFSM | 30 | | | | | | | A | Thermal Characteristics | Characteristic | Symbol | Value | Unit | | --- | --- | --- | --- | | Maximum Thermal Resistance, Junction to Terminal | R 􀁔JT | 30 | °C/W | | Operating and Storage Temperature Range | TJ, TSTG | -65 to +150 | °C | Electrical Characteristics (@TA = +25°C unless otherwise specified. ) | Characteristic | | Symbol | US1A | US1B | US1D | US1G | US1J | US1K | US1M | Unit | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | Forward Voltage Drop | @ IF = 1.0A | V FM | | 1.0 | | 1.3 | | 1.7 | | V | | Peak Reverse Current
at Rated DC Blocking Voltage (Note 4) | @ TA = +25°C
@ TA = +100°C | IRM | 5.0
100 | | | | | | | µA | | Reverse Recovery Time (Note 5) | | trr | | 5 | 0 | | | 75 | | ns | | Typical Total Capacitance (Note 6) | | CT | | 2 | 0 | | | 10 | | pF | Notes: 4. Short duration pulse test used to minimize self-heating effect. 5. Measured with IF = 0.5A, IR = 1.0A, Irr = 0.25A. See Figure 5. 6. Measured at 1.0MHz and applied reverse voltage of 4.0V DC. 25 50 75 100 125 150 TT , TERMINAL TEMPERATURE (°C) Fig. 1 Forward Current Derating Curve I ,F INSTANTANEOUS FORWARD CURRENT (A) 10 1.0 0.1 0.01 0 0.4 0.8 1.2 1.6 2.0 VF , INSTANTANEOUS FORWARD VOLTAGE (V) Fig. 2 Typical Forward Characteristics US1A-US1M Document number: DS16008 Rev. 11-2 2 of 5 [www.diodes.com](www.diodes.com) December 2014 © Diodes Incorporated

FAQs

What are the key features of the US1A-US1M rectifier?

It uses glass passivated die construction with ultra-fast recovery time for high efficiency, supports surge overload up to 30A peak, and is suited for automated assembly. It also offers lead-free finish and “Green” compliance (halogen and antimony free).

How are the device variants and ordering codes structured?

The part number format is US1x-13-F for SMA packaging with 5,000 per tape and reel. Here, x denotes the device type (e.g., US1A-13-F), and US1x also maps to the product type marking code.

What electrical and thermal parameters are provided for selecting the correct operating conditions?

The datasheet lists maximum ratings such as peak repetitive reverse voltage (VRRM), RMS reverse voltage, and forward surge current, plus thermal resistance (junction to terminal) and operating/storage temperature range. Electrical characteristics include forward voltage drop at specified forward currents, reverse current at blocking voltage, reverse recovery time, and typical total capacitance.

Oct 12, 2026

Upload by nayy☆