Diodes Incorporated MBRD835L-T-F

Overview

MBRD835L-T-F from Diodes Incorporated is an 8A, 35V low forward-voltage Schottky barrier rectifier in DPAK package, designed for high-efficiency freewheeling, polarity protection, and low-voltage DC-DC conversion. It features 0.41V typical V_F at 8A/125°C, 75A non-repetitive surge rating, and junction-to-case thermal resistance of 6.0°C/W.

For engineers reviewing the MBRD835L-T-F datasheet, MBRD835L-T-F pinout, MBRD835L-T-F application, or MBRD835L-T-F equivalent, key selection factors include its low V_F at elevated temperature, DPAK thermal performance with PCB heatsinking, and mandatory PCB-level connection between pins 1 and 3 for current sharing and thermal path integrity.

Technical Context

This device implements a single-phase, half-wave Schottky rectifier structure with guard-ring die construction for transient voltage immunity. Its 35V V_RRM and 8A I_F(AV) at T_C = 88°C support operation in 24V and 36V industrial power rails.

Thermal design requires mounting on ≥14 mm² copper pad per JEDEC Method 208; junction-to-ambient R_JA is 80°C/W in free air but drops significantly when pins 1 and 3 are electrically joined on PCB to enhance heat spreading from the cathode terminals.

Key Specifications

Pinout & Package

Package: DPAK (TO-252AA), surface-mount, with exposed thermal pad connected to cathode (pins 1 & 3). Pins 1 and 3 must be electrically joined on PCB to ensure current sharing and optimal thermal transfer.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STPS835D and SS8P3L, the MBRD835L-T-F delivers superior thermal stability at high junction temperature and verified transient resilience via guard-ring die-critical for automotive and industrial power stages where reliability under stress is non-negotiable.

Availability

MBRD835L-T-F is available at Aetrix Electronics and suitable for industrial motor drives, automotive body electronics, telecom power supplies, and embedded DC-DC converters requiring stable component supply across multi-year production cycles.

Supply support for MBRD835L-T-F 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 and signal integrity solutions for industrial, automotive, and computing markets.

The MBRD835L belongs to Diodes' low-V_F Schottky rectifier product line, engineered specifically for efficiency-critical 24V–48V power conversion and robustness in harsh electrical environments.

FAQ

What is the correct PCB layout requirement for pins 1 and 3?

Pins 1 and 3 must be electrically connected via a low-impedance copper trace or common pad on the PCB. This dual-cathode configuration reduces effective series resistance and improves thermal spreading from the die to the board. Failure to join them violates the rated 8A current specification and risks localized overheating.

Can MBRD835L-T-F replace a standard PN-junction rectifier in a 24V supply?

Yes-it replaces 1N5408 or similar 3A–6A PN rectifiers in higher-current applications. With 8A average rating and 0.41V forward drop at 125°C, it cuts conduction losses by ~60% versus a PN diode, reducing thermal stress and improving efficiency in 24V linear or switching supplies.

Is the exposed pad (Pin 4) electrically isolated?

No-the exposed thermal pad is internally connected to the cathode. It must be soldered to a cathode net and cannot be left floating or grounded separately. Proper soldering to ≥14 mm² copper area is required to achieve the specified 6.0°C/W R_JC and full 8A current rating.

Does this device require derating for capacitive loads?

Yes-per datasheet, average forward current must be reduced by 20% when used with capacitive-input filters. For example, maximum I_F(AV) drops from 8A to 6.4A at T_C = 88°C to prevent excessive peak forward current and junction overheating during capacitor charging surges.