Diodes Incorporated SBL1635

Overview

SBL1635 from Diodes Incorporated is a 16A, 35V Schottky barrier rectifier in TO-220AC package, featuring low forward voltage drop (0.75V @ 16A, 25°C), high surge capability (275A, 8.3ms), and thermal resistance of 3.5°C/W. It serves as a primary output rectifier in low-voltage DC-DC converters and free-wheeling diode in synchronous buck controllers for industrial power supplies.

For engineers reviewing the SBL1635 datasheet, SBL1635 pinout, SBL1635 application, or SBL1635 equivalent, key selection criteria include forward voltage at rated current, junction-to-case thermal resistance, peak repetitive reverse voltage, and surge current rating under capacitive load derating conditions.

Technical Context

This device uses guard ring die construction to enhance transient protection and reduce leakage during voltage transients. Its Schottky barrier architecture enables zero minority-carrier storage, supporting high-frequency switching up to several hundred kHz without reverse recovery losses.

The TO-220AC package provides direct metal case thermal path to heatsink, enabling sustained 16A conduction at TC = 95°C per derating curve. Pin 1 is anode (+), Pin 2 is cathode (–), and the metal tab is electrically connected to the cathode terminal.

Key Specifications

Pinout & Package

Package: TO-220AC molded plastic case (UL 94V-0), with metal tab electrically tied to cathode. Mounting position unrestricted; terminals tin-plated, solderable per MIL-STD-202 Method 208.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-16CTQ035 and MBR1635CT, the SBL1635 offers balanced trade-offs: slightly higher VFM than Vishay but wider availability and simpler single-diode integration versus ON's dual configuration, making it optimal for new single-output designs where supply chain stability matters.

Availability

SBL1635 is available at Aetrix Electronics and suitable for server VRMs, industrial DC-DC converters, and automotive body control modules requiring stable component supply across multi-year production cycles.

Supply support for SBL1635 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 centers across Asia and manufacturing in China, Taiwan, and the US.

The SBL16xx series belongs to Diodes' high-current Schottky rectifier product line, engineered specifically for high-efficiency, low-voltage power conversion in computing, industrial, and telecom infrastructure where thermal performance and surge robustness are critical.

FAQ

Is SBL1635 suitable for use in automotive applications?

Yes, SBL1635 meets AEC-Q101 stress test requirements for discrete semiconductors and operates across –65°C to +150°C. Its 35V VRRM exceeds ISO 7637-2 pulse 5a (30V), and its guard ring construction improves transient immunity in 12V battery systems. However, final qualification depends on board-level ESD and EMC testing per vehicle OEM specifications.

What is the maximum allowable case temperature for continuous 16A operation?

The datasheet specifies IO = 16A at TC = 95°C, confirmed by Fig. 1 derating curve. Exceeding 95°C case temperature requires linear derating: at TC = 100°C, max IO drops to ~14.8A; at TC = 110°C, it falls to ~12.2A. Maintaining TC ≤ 95°C requires a heatsink with thermal resistance ≤ 1.9°C/W including interface material.

Can SBL1635 replace SBL1640 in an existing design?

Yes, SBL1635 can substitute SBL1640 if the circuit's maximum reverse voltage does not exceed 35V. The lower VRRM reduces voltage margin by 5V but maintains identical package, pinout, thermal resistance, and forward characteristics at rated current. Verify transient voltage spikes remain within 35V during all operating modes before replacement.

Does the metal tab require electrical isolation from the heatsink?

No - the metal tab is electrically connected to the cathode (Pin 2), so isolation is required only if the heatsink is at a different potential than the cathode net. In most applications where the cathode connects to system ground or output rail, insulating pads or shoulder washers must be used to prevent short circuits when mounting to grounded chassis or shared heatsinks.