Diodes Incorporated DFLS120L-7

Overview

DFLS120L-7 from Diodes Incorporated is a 1.0A surface-mount Schottky barrier rectifier in PowerDI123 package, rated for 20V peak repetitive reverse voltage, 0.32V forward voltage at 1.0A, and 50A non-repetitive surge current; used in low-voltage DC/DC converter outputs and USB power rails where low conduction loss and fast switching are critical.

For engineers reviewing the DFLS120L-7 datasheet, DFLS120L-7 pinout, DFLS120L-7 application, or DFLS120L-7 equivalent, key selection criteria include forward voltage drop at rated current, thermal resistance junction-to-soldering (10°C/W), surge current capability (50A), RoHS/Green compliance, and cathode-band polarity marking for PCB layout verification.

Technical Context

This Schottky rectifier employs guard ring die construction to suppress transient-induced avalanche breakdown and patented interlocking clip design to sustain high surge currents without bond wire failure. Its low 0.32V VF at 1.0A and 75pF total capacitance at 10V enable high-efficiency operation in 5V/3.3V buck converter freewheeling paths.

The device operates across –55°C to +125°C with 10°C/W junction-to-soldering thermal resistance, optimized for direct thermal coupling to copper pads on FR-4 or GETEK boards. Reverse leakage remains ≤1.0mA at 20V and +25°C, supporting stable blocking in battery backup and load-switching circuits.

Key Specifications

Pinout & Package

Package: PowerDI123 - Surface-mount plastic package with exposed cathode tab for thermal and electrical connection; dimensions: 3.70mm × 2.80mm × 1.00mm (L × W × H); weight ≈ 0.01g; UL 94V-0 rated molding compound.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Schottky rectifier applications.

Compared with SB120-E3/54 and SS12, DFLS120L-7 delivers lower forward voltage (0.32V vs. ≥0.45V), superior surge robustness (50A vs. 30–40A), and quantified 10°C/W RθJS-enabling higher power density and more reliable operation in thermally demanding or transient-prone environments.

Availability

DFLS120L-7 is available at Aetrix Electronics and suitable for USB power delivery modules, 5V DC/DC converters, industrial sensor nodes, and automotive body control modules requiring stable component supply, RoHS/Green compliance, and consistent thermal performance.

Supply support for DFLS120L-7 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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.

The DFLS120L-7 belongs to Diodes' PowerDI® Schottky rectifier product line, engineered specifically for high-efficiency, low-voltage power conversion in space-constrained and thermally sensitive applications such as portable electronics and automotive subsystems.

FAQ

What is the maximum allowable junction temperature for DFLS120L-7?

The DFLS120L-7 has a maximum operating junction temperature of +125°C, verified per datasheet Section 2 (Thermal Characteristics). This rating applies under steady-state conditions with appropriate PCB copper area and airflow; derating is required above +85°C ambient unless thermal design meets RθJA ≤ 60°C/W on GETEK or ≤180°C/W on FR-4.

Does DFLS120L-7 support lead-free reflow soldering?

Yes-DFLS120L-7 features matte tin annealed over copper leadframe and is qualified for standard Pb-free reflow profiles per JEDEC J-STD-020, including peak temperatures up to 260°C. Its moisture sensitivity level is rated Level 1, permitting unlimited floor life at ≤30°C/60% RH without dry-pack requirements.

How is polarity identified on the DFLS120L-7 package?

Polarity is marked by a visible cathode band on the top surface of the PowerDI123 package, aligned with the cathode terminal (exposed metal tab on bottom). The band corresponds to the cathode side in the top-view mechanical drawing (DS30444 Rev. 7-2, Page 4), and must be oriented toward the circuit's ground or return path during placement.

Can DFLS120L-7 replace a standard silicon rectifier in a 5V supply?

Yes-its 20V VRRM and 1.0A IF(AV) rating make it suitable for 5V systems, and its 0.32V VF at 1.0A reduces conduction loss by ~55% versus a typical 1N4001 (VF ≈ 0.7V). However, reverse leakage (1.0mA at 20V) is higher than silicon, so verify standby current impact in ultra-low-power applications.