STMicroelectronics BAT46CFILM

Overview

BAT46CFILM from STMicroelectronics is a common-cathode dual Schottky diode in SOT-23 package, rated for 100 V repetitive peak reverse voltage and 150 mA continuous forward current, with typical junction capacitance of 6 pF at 1 V and forward voltage drop of 0.45 V at 10 mA - used in high-speed polarity protection and signal routing in compact DC/DC converter feedback paths.

For engineers reviewing the BAT46CFILM datasheet, BAT46CFILM pinout, BAT46CFILM application, or BAT46CFILM equivalent, key selection criteria include low VF for efficiency-sensitive bias networks, common-cathode configuration for dual-rail clamping, thermal resistance (500 °C/W) in SOT-23 layout, and 150 °C max junction temperature for automotive under-hood signal conditioning.

Technical Context

The BAT46CFILM integrates two independent Schottky diodes sharing a single cathode terminal, enabling simultaneous clamping or steering of two input signals to a common reference rail. Its low 0.45 V forward voltage at 10 mA and negligible switching losses support high-frequency operation up to 100 MHz in RF detector and sample-and-hold circuits.

Designed for surface-mount reliability in space-constrained applications, it features a 100 V VRRM rating suitable for 24 V and 48 V industrial bus protection, and exhibits stable reverse leakage (<2 µA at VR = 50 V, Tj = 25 °C) across its –65 °C to +150 °C operating range.

Key Specifications

Pinout & Package

Package: SOT-23 - 3-pin plastic surface-mount package with gull-wing leads, 1.0 mm pitch, JEDEC TO-236AB compliant, ECOPACK® lead-free finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NSR0230HT1G and BAT54C, BAT46CFILM uniquely balances 100 V VRRM, 0.45 V VF, and 6 pF capacitance in a true common-cathode SOT-23 - making it the only option among the three qualified for 24–48 V industrial signal routing with sub-100 MHz bandwidth.

Availability

BAT46CFILM is available at Aetrix Electronics and suitable for industrial power supplies, USB-C port protection, precision op-amp front-ends, and isolated DC/DC converter feedback networks requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for BAT46CFILM 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power devices, sensors, and analog ICs for industrial, automotive, and consumer markets.

The BAT46 Series belongs to ST's high-reliability small-signal Schottky portfolio, engineered specifically for low-loss signal routing and transient protection in space- and power-constrained embedded systems.

FAQ

What is the maximum surge current rating for BAT46CFILM?

The BAT46CFILM has a non-repetitive surge forward current (IFSM) rating of 1 A for 10 ms sinusoidal pulses. This rating applies to both anodes simultaneously when current flows through either anode-to-common-cathode path, and is validated per IEC 61000-4-5 surge test conditions with appropriate PCB thermal relief.

Can BAT46CFILM be used in place of BAT54C in a 5 V logic clamp?

Yes, BAT46CFILM can replace BAT54C in 5 V logic clamping, but with trade-offs: its higher VF (0.45 V vs. 0.24 V) increases conduction loss, while its 100 V VRRM and lower capacitance (6 pF vs. 10 pF) improve noise immunity and high-frequency performance - ideal for noisy industrial 5 V buses.

Is BAT46CFILM RoHS-compliant and halogen-free?

Yes, BAT46CFILM is manufactured in ST's ECOPACK®-compliant SOT-23 package with lead-free second-level interconnect and fully complies with RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level 1. Halogen content is below 900 ppm total, meeting IEC 61249-2-21 requirements.

What is the recommended pad layout for thermal performance in SOT-23?

For optimal thermal performance, ST recommends a minimum 2.5 mm × 2.5 mm copper pour connected to each SOT-23 lead via ≥2 thermal vias (0.3 mm diameter) per pad, using 35 µm copper thickness on FR4. This achieves the specified Rth(j-a) = 500 °C/W and prevents junction temperature exceedance at 150 mA continuous load.