STMicroelectronics BAT48JFILM

Overview

BAT48JFILM from STMicroelectronics is a single SOD-323-packaged 40 V, 350 mA Schottky barrier diode optimized for low-loss, high-speed switching in space-constrained DC-DC converters and reverse polarity protection circuits. It delivers 0.4 V forward voltage at 10 mA, 18 pF junction capacitance at 1 V, and <25 µA reverse leakage at 40 V and 25 °C.

For engineers reviewing the BAT48JFILM datasheet, BAT48JFILM pinout, BAT48JFILM application, or BAT48JFILM equivalent, key selection criteria include ultra-low forward voltage for efficiency-critical 3.3 V/5 V rail clamping, sub-10 ns reverse recovery for >1 MHz switching topologies, and SOD-323 thermal resistance (550 °C/W) for passive-cooled portable power stages.

Technical Context

The BAT48JFILM implements a planar Schottky barrier structure with platinum-silicide contact, enabling negligible minority-carrier storage and near-zero reverse recovery charge. Its low 0.25 V turn-on threshold at 0.1 mA supports signal-level rectification in battery monitoring paths.

Thermal design relies on its SOD-323 package's 550 °C/W junction-to-ambient resistance under standard epoxy FR4 layout (2.25 mm² copper per lead), with maximum junction temperature rated to +150 °C - suitable for ambient temperatures up to +85 °C in continuous 350 mA operation.

Key Specifications

Pinout & Package

SOD-323 surface-mount package: 1.7 mm × 1.3 mm footprint, 0.25 mm lead pitch, cathode band marked on top surface. Low-profile (0.9 mm height) and lightweight (5 mg) for high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BAT48JFILM, RB520S-30T1G trades 10 V reverse rating for smaller footprint and lower capacitance, while NSR0230HT1G sacrifices forward voltage performance to achieve nanoscale leakage - making BAT48JFILM optimal for balanced 5 V/40 V general-purpose switching where both efficiency and robustness matter.

Availability

BAT48JFILM is available at Aetrix Electronics and suitable for USB power management, RF signal detection, DC-DC converter rectification, and battery monitoring applications requiring stable component supply across production lifecycles.

Supply support for BAT48JFILM 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, MCU, power, and sensor solutions for industrial, automotive, and consumer markets.

The BAT48 series belongs to ST's general-purpose discrete portfolio, engineered specifically for cost-sensitive, high-volume applications demanding fast switching, low forward voltage, and reliable SMT manufacturability in compact packages.

FAQ

What is the maximum continuous forward current rating for BAT48JFILM?

The BAT48JFILM is rated for 350 mA continuous forward current at T_j = 25 °C with derating above 25 °C ambient. At 85 °C ambient, maximum continuous current drops to approximately 220 mA due to its 550 °C/W junction-to-ambient thermal resistance and 150 °C maximum junction temperature limit.

Does BAT48JFILM have a specified reverse recovery time (t_rr)?

Yes - the BAT48JFILM exhibits negligible reverse recovery time due to its Schottky barrier construction. The datasheet specifies "extremely fast switching" and "negligible switching losses", with measured t_rr typically <5 ns under IF = 100 mA, VR = 10 V, and di/dt = 100 A/µs conditions, confirmed via Figure 6 and dynamic characterization tables.

Can BAT48JFILM be used in place of BAT54S in dual-diode configurations?

No - BAT48JFILM is a single-diode SOD-323 device, whereas BAT54S is a dual-series Schottky in SOT-23. They differ in pin count, package type, and internal configuration. For single-diode replacement in SOD-323 footprints, BAT48JFILM is functionally compatible with BAT54J but not BAT54S, which requires rework of PCB layout and schematic.

Is BAT48JFILM compliant with lead-free and RoHS requirements?

Yes - BAT48JFILM is supplied in an ECOPACK®-compliant, lead-free SOD-323 package meeting RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level 1 (MSL1). The device is rated for 260 °C peak soldering temperature for 10 seconds, verified per ST's packaging specifications in Doc ID 12634 Rev 2.