Diodes Incorporated US1K-13

Overview

US1K-13 from Diodes Incorporated is an ultra-fast surface-mount silicon rectifier diode rated for 800 V peak repetitive reverse voltage, 1.0 A average rectified output current at T_T = +75°C, and 50 ns reverse recovery time. It features glass passivated die construction, 30 A non-repetitive peak forward surge capability, and is optimized for high-frequency switching power supplies and AC/DC adapters.

For engineers reviewing the US1K-13 datasheet, US1K-13 pinout, US1K-13 application, or US1K-13 equivalent, key selection criteria include its 800 V V_RRM, low 1.7 V forward voltage at 1.0 A, 50 ns trr, RoHS-compliant lead-free plating, and SMA package suitability for automated assembly in compact power conversion designs.

Technical Context

This device operates as a unidirectional power rectifier in single-phase, half-wave configurations with resistive or inductive loads. Its ultra-fast recovery (50 ns) minimizes switching losses in high-frequency SMPS topologies, while the 30 °C/W junction-to-terminal thermal resistance supports reliable operation up to +150°C junction temperature.

The SMA package enables surface-mount integration with defined thermal path and moisture sensitivity level 1 handling. Reverse leakage remains ≤100 µA at +100°C and rated blocking voltage, ensuring stable DC bus hold-up in offline converters.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH1R08 and ES1J, US1K-13 delivers best-in-class balance of low V_F (1.7 V), fast t_rr (50 ns), and standardized SMA thermal performance-making it optimal for space- and efficiency-critical 100–300 kHz offline power stages where thermal management is PCB-limited.

Availability

US1K-13 is available at Aetrix Electronics and suitable for AC/DC adapters, switch-mode power supplies, LED driver power stages, and offline battery chargers requiring stable component supply, consistent parametric performance, and RoHS-compliant sourcing.

Supply support for US1K-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-reliability power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.

The US1x series belongs to Diodes' ultra-fast rectifier product line, engineered specifically for high-efficiency, high-frequency AC/DC conversion where low forward drop, rapid recovery, and robust surge tolerance are critical.

FAQ

What is the maximum junction temperature for US1K-13?

The US1K-13 has a specified operating junction temperature range of –65°C to +150°C. Its thermal resistance (R_θJT = 30°C/W) allows safe operation at full 1.0 A load up to +75°C terminal temperature, with derating required above that per Figure 1 in DS16008 Rev. 11-2.

Is US1K-13 suitable for use in PFC circuits?

Yes-US1K-13 is commonly used in boost PFC front-ends as the output rectifier due to its 800 V V_RRM, 50 ns t_rr, and ability to handle 30 A surge currents. Its low Q_rr reduces turn-off losses and EMI, though synchronous rectification may be preferred for >95% efficiency targets.

Does US1K-13 have a cathode band or notch for polarity identification?

Yes-US1K-13 uses a visible cathode band on the body for polarity identification, consistent with SMA package conventions. The band marks the cathode terminal, and the opposite end is the anode. This marking is verified in the mechanical drawings and top-view diagrams of DS16008.

Can US1K-13 replace US1M-13 in a design?

No-US1M-13 has 1000 V V_RRM, while US1K-13 is rated for 800 V. Substitution is only acceptable if the circuit's peak reverse voltage never exceeds 800 V, including transients and reflected spikes. Derating guidelines require ≥20% margin, making US1K-13 unsuitable for nominal 1000 V designs.