STMicroelectronics BAS70KFILM

Overview

BAS70KFILM from STMicroelectronics is a single low-capacitance Schottky diode in SOD-523 package, rated for 70 V reverse voltage and 70 mA continuous forward current, with 2 pF capacitance and 30 Ω differential forward resistance at 100 MHz - optimized for RF signal detection and temperature compensation circuits.

For engineers reviewing the BAS70KFILM datasheet, BAS70KFILM pinout, BAS70KFILM application, or BAS70KFILM equivalent, this device is selected for high-frequency signal path integrity where low junction capacitance, minimal series inductance (1.5 nH), and fast switching response are critical in compact RF front-ends and bias networks.

Technical Context

The BAS70KFILM implements a planar Schottky barrier structure enabling negligible reverse recovery time and ultra-low conduction losses. Its 2 pF capacitance at 0 V and 1.5 nH series inductance support stable impedance matching up to UHF frequencies.

Thermal performance is defined by R_th(j-a) = 600 °C/W on epoxy PCB, with maximum junction temperature of 150 °C and storage range from –65 °C to +150 °C - suitable for thermally constrained surface-mount RF modules.

Key Specifications

Pinout & Package

Package: SOD-523 - ultra-compact surface-mount plastic case (0.6 mm × 1.6 mm footprint), lead-free, ECOPACK® compliant, designed for high-density RF PCB layouts with minimal thermal mass.

Key Features

Applications

Availability

BAS70KFILM is available at Aetrix Electronics and suitable for RF signal detection, temperature compensation networks, low-power bias generation, and ESD-sensitive RF input protection requiring stable component supply across high-mix production runs.

Supply support for BAS70KFILM 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 analog, power, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.

The BAS70 series belongs to ST's precision RF discrete portfolio, engineered specifically for high-frequency signal conditioning - emphasizing low capacitance, minimal inductance, and thermal robustness in miniature packages.

FAQ

What is the maximum reverse voltage rating for BAS70KFILM?

The BAS70KFILM has a repetitive peak reverse voltage (V_RRM) rating of 70 V, verified per Table 2 of STMicroelectronics Doc ID 12563 Rev 2. This rating applies at T_j = 25 °C and defines the maximum sustained reverse bias before breakdown under normal operating conditions.

Does BAS70KFILM have a specified junction-to-ambient thermal resistance?

Yes - R_th(j-a) is 600 °C/W for the SOD-523 package when mounted on an epoxy FR4 PCB with recommended pad layout, as listed in Table 3. This value assumes standard 35 µm copper thickness and accounts for thermal conduction through leads and package body.

How does the 2 pF capacitance impact RF performance at 2.4 GHz?

At 2.4 GHz, the 2 pF junction capacitance presents a reactance of ≈33 Ω, which is sufficiently high to avoid significant shunting of 50 Ω signal paths. Measured C vs. VR curves (Figure 5) confirm stable capacitance down to 0.1 pF variation across 0–30 V, supporting consistent impedance matching.

Is BAS70KFILM compatible with lead-free reflow soldering processes?

Yes - the device is qualified for lead-free assembly with a maximum soldering temperature of 260 °C (Table 2), and its ECOPACK® packaging meets RoHS and halogen-free requirements per ST's environmental compliance documentation.