Diodes Incorporated SBG1645CT-T-F

Overview

SBG1645CT-T-F from Diodes Incorporated is a 16A dual common-cathode surface-mount Schottky barrier rectifier in D²PAK (TO-263) package, rated for 45V peak repetitive reverse voltage, 0.55V forward voltage at 8A per element, and 175A non-repetitive surge current - deployed in low-voltage DC/DC converter output stages and polarity protection circuits.

For engineers reviewing the SBG1645CT-T-F datasheet, SBG1645CT-T-F pinout, SBG1645CT-T-F application, or SBG1645CT-T-F equivalent, key selection criteria include its 3.0°C/W junction-to-case thermal resistance, 275pF typical capacitance at 1MHz, -65°C to +125°C operating range, RoHS-compliant tin finish, and D²PAK mounting compatibility with heatsink interfaces.

Technical Context

This dual Schottky rectifier integrates two independent anode terminals sharing a common cathode, enabling synchronous rectification or dual-path freewheeling in center-tapped or parallel-output topologies. Its guard ring die construction provides inherent transient voltage suppression without external TVS devices.

Designed for high-frequency switching environments (e.g., <100kHz DC/DC converters), it delivers low conduction loss due to minimal forward voltage and avoids minority-carrier recovery delay - eliminating reverse recovery charge (Qrr ≈ 0) and associated switching losses seen in PN-junction diodes.

Key Specifications

Pinout & Package

Package: D²PAK (TO-263), surface-mount, single-row 3-terminal configuration with exposed metal tab (cathode) for thermal and electrical connection. Molded plastic body (UL 94V-0), 1.7g mass, moisture sensitivity level 1.

Key Features

Applications

Availability

SBG1645CT-T-F is available at Aetrix Electronics and suitable for DC/DC converter output rectification, polarity protection circuits, freewheeling in motor drivers, and redundant power OR-ing requiring stable component supply and long-term industrial availability.

Supply support for SBG1645CT-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, headquartered in Plano, Texas, with design and manufacturing operations across Asia and the Americas.

The SBG16xxCT series belongs to Diodes' high-current Schottky rectifier product line, engineered specifically for high-efficiency, high-reliability power conversion in industrial, computing, and telecom infrastructure where low VFM and robust surge capability are critical.

FAQ

Is SBG1645CT-T-F pin-compatible with SBG1640CT-T-F?

Yes - both share identical D²PAK package, pinout (Anode1–Cathode–Anode2), and thermal/mechanical dimensions. The only difference is VRRM: 45V vs. 40V. Substitution is permissible if system reverse voltage stress remains ≤40V; no layout or thermal redesign is needed.

What is the maximum recommended PCB copper area for thermal relief?

For continuous 16A operation at TC = 95°C, Diodes recommends ≥400 mm² of 2-oz copper connected to the cathode tab, with ≥2 thermal vias (0.3mm diameter, filled) per mm² of pad area. This achieves RθJA ≈ 12°C/W in still air, limiting Tj to <115°C.

Does SBG1645CT-T-F require derating for capacitive loads?

Yes - per datasheet note, average forward current must be derated by 20% when driving highly capacitive loads (e.g., bulk input filters). At 16A rated IO, this means limiting continuous current to 12.8A to avoid localized heating and premature failure due to high inrush di/dt.

Can SBG1645CT-T-F replace a single 16A through-hole diode?

No - it is a dual-element device with two anodes and one shared cathode. To replace a single-anode diode, only one anode (Pin 1 or Pin 3) and the cathode (Pins 2&4) should be used; the unused anode must be left unconnected or tied to cathode only if circuit topology permits - never floated.