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BALF-SPI2-02D3: Features, Specs & More

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BALF-SPI2-02D3: Features, Specs & More

In the dynamic world of electronics, innovation is the key to staying ahead. One component that exemplifies this ethos is the STMicroelectronics BALF-SPI2-02D3 RF Transformer. In this comprehensive article, we'll delve into the intricacies of the BALF-SPI2-02D3, uncovering its definition, key features, specifications, applications, and a closer look at its manufacturer.

BALF-SPI2-02D3's Overview

At its core, the STMicroelectronics BALF-SPI2-02D3 is a Balun Transformer, designed to facilitate seamless RF signal transmission in electronic circuits. This Surface Mount device boasts six terminals, ensuring versatile connectivity and integration within circuitry. Its compact form factor, with dimensions of 2.1mm (L) x 1.55mm (D) x 0.63mm (H), makes it ideal for applications where space is at a premium.

Pinout diagram.png

△ Pinout diagram - Top view

Key Features

Let's delve into the standout features that make BALF-SPI2-02D3 a game-changer:

· With a maximum insertion loss of 2.2 dB, the BALF-SPI2-02D3 ensures minimal signal degradation, maintaining signal integrity even in demanding environments.

· Solder leads provide robust electrical connections, enhancing reliability in surface mount applications.

· Designed for surface mount installation, offering flexibility and ease of integration into PCB layouts.

· Featuring six terminals, this transformer facilitates versatile connectivity options, catering to diverse circuit configurations.

· Operating efficiently in temperatures ranging from -40°C to 105°C, the BALF-SPI2-02D3 ensures reliable performance across a wide spectrum of operating conditions.

· Housed in a compact flip chip package and delivered in tape and reel packaging, the BALF-SPI2-02D3 ensures convenient handling and assembly processes.

· With dimensions of 2.1mm (L) x 1.55mm (D) x 0.63mm (H) and a weight of 0.0034 grams, this transformer offers a compact footprint without compromising performance.



Now, let's delve into the technical specifications that make the BALF-SPI2-02D3 a standout choice for electronic projects:



Transformer Type

Balun Transformer

Maximum Insertion Loss (dB)


Lead Style



Surface Mount

Number of Terminals


Minimum Operating Temperature (°C)


Maximum Operating Temperature (°C)


Package Type

Flip Chip


Tape and Reel

Product Weight (g)


Product Length (mm)


Product Depth (mm)


Product Height (mm)




The versatility of the BALF-SPI2-02D3 extends across various electronic applications, including but not limited to:

· Wireless Communication Systems: Facilitating seamless RF signal transmission in wireless communication devices such as smartphones, tablets, and IoT devices.

· RFID Systems: Enhancing the performance and reliability of Radio Frequency Identification (RFID) systems, ensuring accurate data capture and transmission.

· Medical Devices: Playing a vital role in medical equipment such as patient monitoring systems and diagnostic devices, where precision and reliability are paramount.

· Automotive Electronics: Enabling efficient RF signal processing in automotive applications, including keyless entry systems, tire pressure monitoring, and vehicle-to-vehicle communication systems.

ST S2-LP application diagram example.png

ST S2-LP application diagram example


BALF-SPI2-02D3's Manufacturer

STMicroelectronics, often abbreviated as ST, is a global semiconductor manufacturer with a long-standing reputation for producing innovative and high-quality electronic components. With headquarters in Geneva, Switzerland, and a strong international presence, STMicroelectronics is a leading player in the semiconductor industry. They specialize in designing and manufacturing a wide range of semiconductor devices, including microcontrollers, sensors, power management solutions, and more. STMicroelectronics is trusted by industries worldwide, including automotive, consumer electronics, industrial, and telecommunications, for their cutting-edge technology and commitment to advancing the field of electronics.


In conclusion, the STMicroelectronics BALF-SPI2-02D3 represents a pinnacle of innovation in RF transformer technology. Its advanced features, robust specifications, and diverse applications for uncompromised performance and reliability in their electronic systems.


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