Diodes Incorporated SBL1645CT

Overview

SBL1645CT from Diodes Incorporated is a 16A dual common-cathode Schottky barrier rectifier in TO-220AB package, rated for 45V peak reverse voltage, 0.70V forward voltage at 8.0A/25°C, and 250A non-repetitive surge current - used in low-voltage DC-DC output stages, solar charge controllers, and polarity protection circuits.

For engineers reviewing the SBL1645CT datasheet, SBL1645CT pinout, SBL1645CT application, or SBL1645CT equivalent, key selection criteria include forward voltage drop at operating current, thermal resistance (3.5°C/W), junction-to-case mounting requirements, and transient surge capability under capacitive load derating.

Technical Context

This dual Schottky rectifier integrates two anode terminals (Pins 1 and 3) sharing a common cathode (Pin 2), enabling independent high-current paths with minimal conduction loss. Its guard ring die construction enhances transient immunity without external TVS components.

Designed for operation up to 150°C junction temperature, it requires heatsink mounting per RθJC = 3.5°C/W specification and exhibits 700pF typical junction capacitance at 4V reverse bias - critical for high-frequency switching noise control in SMPS outputs.

Key Specifications

Pinout & Package

Package: TO-220AB molded plastic case (UL 94V-0), with tin-plated terminals solderable per MIL-STD-202 Method 208. Mounting tab (case) is electrically connected to Pin 2 (cathode).

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-16CTH04-M3, SBL1645CT provides higher reverse voltage margin for 48V nominal systems; versus MBR1645CT, it offers slightly lower forward voltage and tighter IRM spec (0.5mA vs. 1.0mA), improving leakage-sensitive standby performance.

Availability

SBL1645CT is available at Aetrix Electronics and suitable for solar charge controllers, automotive polarity protection circuits, server PSU secondary-side rectification, and industrial DC motor freewheeling requiring stable component supply and long-lifecycle support.

Supply support for SBL1645CT 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 and manufacturing operations across Asia and the Americas.

The SBL16xxCT series belongs to Diodes' high-current Schottky rectifier product line, engineered specifically for efficiency-critical 12–48V power conversion systems where low VF, robust surge handling, and thermal reliability are mandatory.

FAQ

Is SBL1645CT RoHS compliant?

Yes, SBL1645CT features lead-free finish and complies with RoHS Directive 2011/65/EU (Revision 13.2.2003), including exemptions for glass and high-temperature solder per EU Annex Notes 5 and 7. Tin-plated terminals meet MIL-STD-202 Method 208 solderability requirements.

Can SBL1645CT be mounted directly to a heatsink without insulation?

No - the metal tab (case) is internally connected to Pin 2 (common cathode). Electrical isolation is required if the heatsink is grounded or at a different potential. Use mica washers or thermally conductive insulating pads compatible with 3.5°C/W RθJC target.

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

The rated IO = 16A applies only at TC = 95°C. Operation above this temperature requires derating per Figure 1 in DS23014 Rev. 8: at TC = 110°C, max IO drops to ~12.5A; at TC = 125°C, it falls to ~9.5A. Heatsink design must maintain case temperature ≤95°C under full load.

Does SBL1645CT support capacitive loads without derating?

No - the datasheet explicitly states "For capacitive load, derate current by 20%." At full 16A rating, capacitive loads require limiting to 12.8A average current to prevent overstress during inrush, due to lack of zero-crossing turn-on behavior inherent to Schottky devices.