STMicroelectronics BAT20JFILM

Overview

BAT20JFILM from STMicroelectronics is a 23 V, 2 A repetitive peak forward current Schottky barrier diode in SOD-323 package, featuring ultra-low reverse leakage (12 µA @ 15 V, 25 °C), low forward voltage (0.35 V typ. @ 100 mA), and 30 pF junction capacitance - optimized for step-up LED drivers and mobile phone power management.

For engineers reviewing the BAT20JFILM datasheet, BAT20JFILM pinout, BAT20JFILM application, or BAT20JFILM equivalent, key selection criteria include reverse leakage at elevated temperature, thermal resistance (600 °C/W on FR4), switching speed, conduction loss modeling (P = 0.32×IF(AV) + 0.23×IF²(RMS)), and SOD-323 board-level thermal derating.

Technical Context

This Schottky diode operates without minority-carrier storage, enabling negligible reverse recovery time and eliminating switching tail current. Its low barrier height yields sub-0.4 V forward drop at 100 mA while maintaining 23 V VRRM - a trade-off balanced for high-efficiency DC-DC conversion below 20 V input.

Thermal design relies on its 600 °C/W junction-to-ambient resistance on standard FR4 (2.25 mm² copper), with derated average forward current (1 A @ δ = 0.38) and surge capability (5 A, 10 ms sine half-wave) validated per JEDEC standards.

Key Specifications

Pinout & Package

SOD-323 surface-mount package: 1.7 mm × 1.3 mm footprint, 0.46 mm max height, gull-wing leads, 0.005 g unit weight, UL94 V-0 epoxy molding compound.

Key Features

Applications

Equivalent & Alternatives

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

Compared with RB520S-30T2R and NSR0230HT1G, BAT20JFILM offers tighter 23 V VRRM alignment with 18–22 V LED boost outputs, lower Cd for >1 MHz operation, and proven thermal behavior on FR4 - making it optimal for space- and frequency-constrained mobile power stages.

Availability

BAT20JFILM is available at Aetrix Electronics and suitable for mobile phone power management, white LED backlight drivers, portable medical sensor supplies, and USB-powered IoT node boost regulators requiring stable component supply across production lifecycles.

Supply support for BAT20JFILM 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 automotive, industrial, and consumer markets.

The BAT20J belongs to ST's high-efficiency Schottky diode product line, engineered specifically for low-voltage, high-frequency DC-DC conversion in battery-powered portable electronics.

FAQ

What is the maximum allowable ambient temperature for continuous 1 A operation?

At 1 A average forward current (IF(AV) = 1 A, duty factor δ = 0.38), the maximum ambient temperature is 65 °C on standard FR4 with 2.25 mm² copper, based on Rth(j-a) = 600 °C/W and Tj(max) = 150 °C. Derating curves in Figure 2 confirm this limit; exceeding it risks thermal runaway.

Can BAT20JFILM replace BAT54 in a 5 V USB charger boost circuit?

No - BAT54 has 30 V VRRM and higher VF (~0.8 V), while BAT20JFILM's 23 V VRRM is insufficient for 5 V input boost circuits generating ≥12 V output. Its lower VF (0.35 V) and leakage (12 µA) are advantageous only if VRRM margin is adequate per application voltage stress.

Is the SOD-323 package compatible with standard reflow profiles?

Yes - BAT20JFILM is qualified for lead-free reflow per J-STD-020, with maximum soldering temperature of 260 °C (TL). Its SOD-323 footprint matches IPC-7351B standard, and thermal mass allows compatibility with standard 240–260 °C peak profiles without delamination or voiding.

How does junction capacitance affect EMI in a 2 MHz boost converter?

At 2 MHz, 30 pF Cd forms a capacitive divider with PCB trace inductance, increasing high-frequency common-mode noise. Measured data (Figure 6) shows Cd drops to ~22 pF at 15 V bias - reducing displacement current and conducted EMI by ~3.2 dB compared to 40 pF alternatives, easing EMC filter sizing.