Diodes Incorporated SBM1040-13

Overview

SBM1040-13 from Diodes Incorporated is a 10A, 40V low forward voltage Schottky barrier rectifier in POWERMITE3 package, designed for low-voltage, high-frequency inverters, freewheeling, and polarity protection. Confirmed parameters: VF = 0.47 V (typ) at 8A/25°C, VRRM = 40 V, IO = 10 A, IFSM = 150 A, RJS = 2.5 °C/W.

For engineers reviewing the SBM1040-13 datasheet, SBM1040-13 pinout, SBM1040-13 application, or SBM1040-13 equivalent, key selection considerations include thermal resistance (2.5 °C/W junction-to-solder point), low VF performance across temperature (0.41–0.51 V), reverse leakage (≤12.5 mA at 100°C), and mandatory PCB-level connection of Pins 1 & 2.

Technical Context

This Schottky rectifier uses guard ring die construction for transient protection and operates with minimal power loss due to its low forward voltage drop and very low leakage current. It supports single-phase, half-wave 60Hz operation under resistive or inductive loads, with 20% current derating required for capacitive loads.

Thermal management is defined by a fixed junction-to-solder-point thermal resistance of 2.5 °C/W, and its maximum junction temperature rating is +150°C. The device exhibits stable capacitance (700 pF at 4 V, 1 MHz) and maintains reverse breakdown ≥40 V at IR = 1 mA.

Key Specifications

Pinout & Package

Package: POWERMITE3 - Molded plastic case (UL 94V-0), 3-pin surface-mount, bottom-side heat sink, weight ≈ 0.072 g. Dimensions per DS30255 Rev. 11: A = 4.03–4.09 mm, B = 6.40–6.61 mm, C = 0.864–0.914 mm, D = 1.83 mm (nom), E = 1.10–1.14 mm, G = 0.173–0.203 mm, H = 5.01–5.17 mm, J = 4.37–4.43 mm, K = 0.173–0.203 mm, L = 0.71–0.77 mm, M = 0.36–0.46 mm, P = 1.73–1.83 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SBM1040-13, PDS1040-13 offers superior conduction efficiency and thermal headroom in the same footprint, while SS1040-13 trades performance for legacy package compatibility but requires significant thermal redesign.

Availability

SBM1040-13 is available at Aetrix Electronics and suitable for DC-DC converter output rectification, automotive polarity protection, and high-frequency inverter freewheeling requiring stable component supply and RoHS-compliant manufacturing.

Supply support for SBM1040-13 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, signal integrity, and protection solutions for industrial and automotive markets.

The SBM1040 belongs to Diodes' Schottky rectifier product line, engineered specifically for high-efficiency, low-voltage power conversion in space-constrained applications where thermal resistance and forward voltage directly impact system efficiency.

FAQ

Why must Pins 1 and 2 be connected on the PCB?

Pins 1 and 2 are both anode terminals internally tied to the same semiconductor die region. Connecting them externally ensures current sharing and prevents localized overheating or bond wire failure under full 10A load. Failure to connect causes uneven current distribution and premature thermal runaway.

What is the significance of RJS = 2.5 °C/W?

RJS defines thermal resistance from junction to solder point-not ambient or case. It enables accurate junction temperature calculation using measured solder pad temperature (TJ = TSOLDER + (P × 2.5)), critical for reliability validation in thermally isolated PCB zones without heatsinks.

Can SBM1040-13 replace standard PN-junction rectifiers in 12V systems?

Yes-its 0.47 V VF delivers ~40% lower conduction loss than a typical 1N5822 (VF ≈ 0.75 V) at 8A, reducing heat generation and improving efficiency. However, its 40V VRRM limits use to ≤12V nominal systems with controlled transients; it is not rated for 24V+ or unclamped inductive spikes.

Is SBM1040-13 suitable for new designs?

No-the datasheet explicitly states "NOT RECOMMENDED FOR NEW DESIGNS USE PDS1040". PDS1040 offers higher current rating (12A), lower VF (0.42 V), and identical packaging. SBM1040-13 remains viable for legacy repair, obsolescence bridging, or cost-sensitive volume production where PDS1040 is unavailable.