Diodes Incorporated B140S1F-7

Overview

B140S1F-7 from Diodes Incorporated is a 1.0A, 40V Schottky barrier rectifier in SOD123F package, featuring a maximum forward voltage of 0.50 V at 1 A and 25°C, reverse leakage current ≤0.2 mA at 40 V/25°C, and thermal resistance R_θJA of 100 °C/W - optimized for boost, blocking, and recirculating diode roles in DC-DC converters and power supplies.

For engineers reviewing the B140S1F-7 datasheet, B140S1F-7 pinout, B140S1F-7 application, or B140S1F-7 equivalent, key selection criteria include low VF for efficiency-critical 1A rectification, high-temperature IR stability up to +150°C, SOD123F footprint compatibility, and RoHS/Green compliance for industrial and consumer power designs.

Technical Context

This Schottky rectifier uses a planar epitaxial construction with a low-barrier metal-semiconductor junction to achieve fast switching (no minority-carrier storage) and minimal forward conduction loss. Its 40 V V_RRM rating supports input stages in 24 V and 36 V systems, while the 30 A I_FSM surge capability handles transient load dumps.

The device exhibits strong thermal robustness: reverse leakage remains ≤6.14 mA at 125°C and ≤0.012 mA at 25°C under 40 V bias, and derating allows 0.6 A continuous operation at +100°C ambient per Figure 4 - critical for thermally constrained PCB layouts.

Key Specifications

Pinout & Package

Package: SOD123F - surface-mount plastic case (2.70 mm × 1.80 mm × 1.15 mm), matte tin-plated copper leadframe, cathode band marking, UL 94V-0 rated molding compound, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SS14 and MBR140, B140S1F-7 delivers the lowest VF (0.50 V), tightest thermal resistance (100 °C/W), and smallest SOD123F footprint - making it optimal for space- and efficiency-constrained 1A rectification where high-temperature leakage stability is required.

Availability

B140S1F-7 is available at Aetrix Electronics and suitable for DC-DC boost converters, solar charge controllers, relay driver protection circuits, and low-voltage AC-DC adapters requiring stable component supply, consistent parametric performance, and RoHS-compliant sourcing.

Supply support for B140S1F-7 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, manufacturing, and sales operations across Asia, Europe, and North America.

The B140S1F-7 belongs to Diodes' Schottky Rectifier product line, engineered specifically for high-efficiency, high-reliability low-voltage power conversion in consumer, industrial, and automotive applications.

FAQ

What is the maximum junction temperature for continuous operation of B140S1F-7?

The B140S1F-7 is rated for continuous operation from –55°C to +150°C junction temperature. At 1 A DC load and 25°C ambient, junction temperature rises ~100°C (per R_θJA = 100 °C/W), reaching 125°C - well within the safe operating range. Derating to 0.6 A is recommended at +100°C ambient per Figure 4.

Does B140S1F-7 have a specified reverse recovery time (t_rr)?

No - as a Schottky barrier rectifier, B140S1F-7 has no minority-carrier storage and therefore no defined reverse recovery time. Its switching is governed by junction capacitance (C_T = 50 pF @ 4 V), enabling near-zero switching loss in high-frequency DC-DC topologies up to several MHz.

Is B140S1F-7 suitable for use in automotive under-hood applications?

Yes - its –55°C to +150°C operating range, stable high-temperature leakage (≤6.14 mA at 125°C), and AEC-Q200-unqualified but automotive-grade construction (green molding, matte tin plating, J-STD-020 Level 1 MSL) make it suitable for non-safety-critical under-hood functions like HVAC blower control or lighting drivers, pending system-level qualification.

How does the SOD123F package differ from standard SOD-123?

SOD123F is a flattened variant of SOD-123 with reduced height (max 1.15 mm vs. 1.6 mm) and tighter dimensional tolerances (e.g., E = 2.60–2.80 mm vs. 2.6–3.0 mm). It improves coplanarity and solder joint reliability in fine-pitch automated assembly, while maintaining full electrical equivalence to SOD-123 devices like SS14.