STMicroelectronics BAT46WFILM

Overview

BAT46WFILM from STMicroelectronics is a single high-voltage small-signal Schottky diode in SOT-323 package, rated for 100 V repetitive peak reverse voltage, 150 mA continuous forward current, and 6 pF typical junction capacitance at 1 V reverse bias. It delivers low forward voltage drop (0.45 V at 10 mA, 25 °C) and negligible switching losses, making it suitable for high-frequency signal routing and ESD-sensitive input protection in portable audio interfaces.

For engineers reviewing the BAT46WFILM datasheet, BAT46WFILM pinout, BAT46WFILM application, or BAT46WFILM equivalent, key selection criteria include its 100 V VRRM rating, 0.45 V VF at 10 mA, 6 pF C_j, 150 °C max junction temperature, and SOT-323 thermal resistance of 550 °C/W on epoxy PCB.

Technical Context

The BAT46WFILM employs a planar Schottky barrier structure optimized for low conduction loss and fast recovery without minority-carrier storage. Its low 0.45 V forward voltage at 10 mA enables efficient clamping in low-power signal paths, while its 6 pF capacitance supports operation up to ~200 MHz in RF detector or antenna switch applications.

Thermal performance is defined by R_th(j-a) = 550 °C/W on standard epoxy FR4 with recommended pad layout, and maximum junction temperature is limited to 150 °C. Reverse leakage remains below 0.8 µA at 10 V and 25 °C, rising to 7.5 µA at 60 °C - critical for battery-powered sensor front-ends requiring stable bias.

Key Specifications

Pinout & Package

Package: SOT-323 - surface-mount plastic package with 3 terminals, 6 mg weight, ECOPACK® lead-free interconnect, UL94 V0 rated epoxy body.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NSR0230HT1G and BAT54CW, BAT46WFILM uniquely balances 100 V robustness, 6 pF low capacitance, and 0.45 V low forward drop in a single-diode SOT-323 - optimal for high-voltage signal integrity and low-leakage biasing where dual-channel or lower-voltage alternatives fall short.

Availability

BAT46WFILM is available at Aetrix Electronics and suitable for USB 2.0 interface protection, low-voltage sensor bias clamping, RF envelope detection, and dual-rail power OR'ing requiring stable component supply across production lifecycles.

Supply support for BAT46WFILM 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, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

The BAT46 series belongs to ST's small-signal Schottky diode product line, engineered specifically for high-frequency signal routing, low-loss clamping, and ESD protection in space-constrained portable and industrial electronics.

FAQ

What is the maximum reverse voltage the BAT46WFILM can block reliably?

The BAT46WFILM has a guaranteed repetitive peak reverse voltage (VRRM) rating of 100 V, verified per IEC 60747-2 under standard test conditions. This rating applies continuously at Tj ≤ 150 °C and ensures no breakdown occurs during transient overvoltage events up to this level in properly designed PCB layouts with adequate creepage clearance.

Does BAT46WFILM have a specified reverse recovery time (t_rr)?

No t_rr value is specified in the official datasheet because the BAT46WFILM is a majority-carrier Schottky diode with no minority-carrier storage. Its switching is governed solely by junction capacitance discharge, resulting in effectively zero reverse recovery time - confirmed by absence of t_rr in Table 4 and dynamic characterization figures showing no tail current.

Can BAT46WFILM be used in place of BAT54 series diodes?

Only in single-diode configurations where 100 V VRRM is required and 6 pF capacitance is acceptable. BAT54 variants (e.g., BAT54C) offer common-cathode dual topology and higher capacitance (10–12 pF), so direct substitution is invalid for dual-line or RF-critical applications. Pin compatibility does not imply functional equivalence due to differing C_j and thermal resistance.

Is BAT46WFILM RoHS and REACH compliant?

Yes - BAT46WFILM is supplied in ECOPACK® packaging with lead-free second-level interconnect, fully compliant with RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. The inner box label and package marking confirm compliance per JEDEC JESD97, and no SVHC substances above threshold are present.