Diodes Incorporated SBL1640PT

Overview

SBL1640PT from Diodes Incorporated is a 16A, 40V TO-3P-packaged Schottky barrier rectifier with 0.55V forward voltage drop at 8.0A/25°C, 250A non-repetitive surge capability, and 3.5°C/W junction-to-case thermal resistance-designed for low-voltage, high-frequency inverters and polarity protection circuits.

For engineers reviewing the SBL1640PT datasheet, SBL1640PT pinout, SBL1640PT application, or SBL1640PT equivalent, key selection criteria include its 40V blocking rating, 16A average output current at 95°C case temperature, low V_F for efficiency-critical DC-DC stages, and TO-3P mechanical compatibility with heatsink-mounting requirements.

Technical Context

This discrete Schottky rectifier uses guard-ring die construction to suppress transient-induced failure and supports single-phase half-wave rectification under 60Hz resistive/inductive loads. Its 700pF typical junction capacitance (measured at 1MHz, 4V reverse bias) enables use in high-frequency switching topologies up to ~100kHz.

The device operates across –65°C to +150°C junction temperature range and requires derating to 12.8A for capacitive loads per manufacturer guidance. Thermal performance is defined with heatsink mounting, yielding 3.5°C/W R_θJC, enabling stable operation at full rated current with adequate heatsinking.

Key Specifications

Pinout & Package

TO-3P package: 3-terminal molded plastic case (UL 94V-0), lead-free bright tin-plated terminals, polarity marked on body. Mounts to heatsink via center tab (cathode).

Key Features

Applications

Availability

SBL1640PT is available at Aetrix Electronics and suitable for DC motor protection, 12V automotive power supplies, and industrial AC-DC front-ends requiring stable component supply despite end-of-life status.

Supply support for SBL1640PT 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 SBL16xxPT series belongs to Diodes' high-current Schottky rectifier product line, engineered specifically for efficiency-critical, high-surge industrial and automotive power conversion where low V_F and robust thermal performance are mandatory.

FAQ

Is SBL1640PT still in production?

No. Diodes Incorporated has officially discontinued the SBL1640PT, marking it "OBSOLETE – PART DISCONTINUED" in DS23046 Rev. 5 (August 2015). No alternate part is offered by the manufacturer, and no second-source equivalents are documented.

What is the correct pin configuration for TO-3P mounting?

The TO-3P package has two anode leads (leads 1 and 2) and one cathode-connected center tab. The tab is electrically the cathode and must be isolated from grounded heatsinks using mica or polymer washers unless circuit topology permits common-cathode grounding.

Can SBL1640PT replace SBL1635PT or SBL1645PT in existing designs?

Yes-SBL1640PT is pin- and footprint-compatible with other SBL16xxPT variants. Its 40V V_RRM sits between the 35V of SBL1635PT and 45V of SBL1645PT; substitution requires verifying that 40V meets system transient margin and that 0.55V V_F aligns with thermal budget.

What thermal derating applies above 95°C case temperature?

Per Figure 1 (Forward Current Derating Curve), current must be linearly reduced from 16A at 95°C to zero at 150°C. At 125°C case temperature, maximum allowable I_O is approximately 9.6A. Capacitive loads require additional 20% derating regardless of temperature.