company blog about ST LEOAC32PT-D Rad-Hard Plastic Quad Two-Input Logic Gate for Inaerospace Environments

Shenzhen Mingjiada Electronics Co., Ltd. supplies and recycles the ST LEOAC32PT-D, a radiation-hardened plastic four-channel dual-input logic gate suitable for aerospace environments.

The ST LEOAC32PT-D is a radiation-hardened plastic four-channel dual-input logic gate specifically developed for the harsh operating conditions of low Earth orbit (LEO) in the aerospace sector; it forms part of the ST-LEO series of radiation-hardened integrated circuits designed for space applications. This device breaks through the industry limitations of traditional aerospace logic chips, which rely on ceramic packaging. With high-reliability plastic packaging as its core advantage, it combines radiation resistance, wide temperature adaptability and cost-effectiveness. It is primarily suited to high-end aerospace electronic applications such as low-Earth orbit satellites, airborne control systems and space telemetry and control equipment, serving as a core foundational logic device for lightweight, low-cost aerospace electronic systems.

I. Core Positioning and Design Specifications of the LEOAC32PT-D

The ST LEOAC32PT-D is a four-channel, dual-input CMOS OR gate circuit, integrating four independent two-input OR logic units. It can simultaneously perform logic processing on multiple digital signals, meeting the fundamental computational requirements of aerospace systems for multi-channel signal routing, logical evaluation and timing control. The product strictly adheres to the ST-LEO space radiation resistance specifications and is compatible with the AEC-Q100 standard for high-reliability electronic components. It is specifically optimised for harsh operating conditions such as the radiation environment of low Earth orbit, extreme temperature cycling in aviation, and mechanical vibration and shock. Unlike standard industrial-grade logic chips, it offers aerospace-grade reliability and environmental resilience.

Compared with traditional ceramic-packaged aerospace logic chips, this device utilises a lightweight plastic packaging solution. Whilst ensuring aerospace-grade radiation resistance and high stability, it significantly reduces the chip’s volume, weight and production costs. It perfectly aligns with the current development requirements for miniaturisation, weight reduction and cost-effectiveness in microsatellites, commercial space equipment and lightweight aviation avionics systems, making it a core logic device for large-scale application in the commercial space sector.

II. LEOAC32PT-D: Core Radiation-Hardened Performance for Aerospace Applications

Cosmic rays, protons and electron radiation in the space environment can easily cause faults in standard semiconductor devices, such as single-event flip-flops, single-event lock-ups and total dose degradation, leading to the failure of electronic systems. Through proprietary chip processes and structural optimisation, the ST LEOAC32PT-D possesses outstanding aerospace-grade radiation resistance, enabling it to operate reliably under near-Earth orbit radiation conditions:

Thanks to its specialised radiation-hardened design, the device effectively withstands the effects of total dose radiation and single-event effects in space, ensuring long-term stable operation under typical near-Earth orbit radiation intensities and preventing issues such as logic operation errors and device failure. Furthermore, the internal circuitry of the chip has been optimised for interference resistance, enabling it to withstand space-borne electromagnetic radiation and electromagnetic interference from on-board equipment. This ensures the precision of logic operations in aerospace electronic systems within complex electromagnetic environments, eliminating faults such as signal distortion and timing shifts.

Leveraging ST’s mature aerospace-grade semiconductor processes, this device addresses the shortcomings of traditional plastic-encapsulated chips—namely, their weak radiation resistance and susceptibility to ageing and failure—by achieving compatibility between plastic packaging and aerospace-grade radiation resistance, making it the preferred choice for low-cost aerospace electronic systems.

III. Key Electrical and Environmental Parameters of the LEOAC32PT-D

The ST LEOAC32PT-D offers wide-range, highly stable electrical and environmental adaptability, comprehensively meeting the operational parameter requirements of aerospace equipment. The core parameter specifications are as follows:

1. Power Supply and Power Consumption Characteristics

Featuring a wide-voltage supply design, the operating supply voltage range is 1.65 V to 6 V, with an absolute maximum rated voltage of 7 V, making it suitable for the low-dropout differential power supply and wide-range voltage fluctuations typical of aerospace equipment. Manufactured using a low-power CMOS process, the chip has extremely low quiescent power consumption, effectively reducing the power load on aerospace equipment. It is well-suited to scenarios with limited energy supplies, such as satellites and airborne equipment, thereby enhancing system endurance and operational stability.

2. Wide Operating Temperature Range

Aerospace equipment must withstand extremely high and low temperatures. This device has an operating temperature range of –40 °C to +125 °C, making it perfectly suited to extreme temperature conditions such as low temperatures at high altitudes, high temperatures caused by solar radiation in space, and high temperatures within the sealed environments of airborne equipment. It maintains stable logic operation accuracy throughout the entire temperature range, with no issues of temperature-induced drift, failure or parameter deviation, thereby meeting the requirements for all-weather operation under all conditions.

3. Operational Performance Specifications

Four independent logic channels operate in parallel without mutual interference, ensuring stable signal transmission rates and rapid logic response times. This meets the requirements for high-speed timing control and real-time signal discrimination in aerospace applications. The device’s input and output characteristics comply with aerospace digital circuit standards, offering strong compatibility and enabling seamless integration with various aerospace master control chips, signal acquisition modules and actuators.

IV. Packaging Process and Structural Advantages of the LEOAC32PT-D

The ST LEOAC32PT-D utilises a slim, shrink-fit TSSOP-20 plastic package with a 20-pin layout. Its compact overall size and slim profile meet the requirements for miniaturisation and high-density PCB routing in aerospace equipment, effectively saving internal space and reducing the overall weight of the system.

The package has been optimised using high-end specialised processes, with core materials and manufacturing processes offering exceptional reliability: the use of alloy bonding wire combined with nickel/palladium/gold lead plating completely eliminates the issue of whisker growth on the pins, thereby preventing short circuits and poor contact faults in the space environment; The plastic packaging material has undergone ageing and reinforcement testing in space environments, offering protection against moisture, oxidation, thermal shock and mechanical vibration. It can withstand the high-frequency vibrations and shock loads encountered during the space launch phase, as well as the long-term ageing conditions of space vacuum and temperature cycling, ensuring the packaging structure remains stable over the long term without damage or performance degradation.

V. Core Application Scenarios for the LEOAC32PT-D

Leveraging its comprehensive advantages of radiation resistance, wide-temperature stability, low power consumption and lightweight design, the ST LEOAC32PT-D is widely used in various high-reliability aerospace electronic systems. Core application scenarios include:

- Low Earth Orbit (LEO) microsatellites: satellite on-board control systems, logic evaluation of attitude sensor signals, data transmission timing scheduling, and power management logic control modules;

- Aircraft-mounted equipment: On-board telemetry and control systems for civil and military aircraft; logic processing of flight parameter acquisition; scheduling of on-board communication signals; fault diagnosis circuits for on-board equipment;

- Space telemetry and control equipment: Ground-based space telemetry and control terminals; low-altitude electronic systems for rockets; logic control units for space experiment payloads;

- Commercial space equipment: Basic logic operation circuits for low-cost networked satellites, space remote sensing equipment and small-scale space experiment platforms.

VI. Summary of the LEOAC32PT-D’s Product Advantages

As an aerospace-grade, radiation-hardened four-channel dual-input logic gate, the ST LEOAC32PT-D’s core advantages lie in three key areas: firstly, reliable performance, featuring aerospace-grade radiation resistance, an ultra-wide operating temperature range, and vibration and interference resistance, making it suitable for the extreme operating conditions of space and aviation; secondly, significant cost and weight-saving advantages: the use of plastic packaging in place of traditional ceramic packaging substantially reduces costs and weight, facilitating large-scale implementation in commercial space applications; thirdly, high adaptability: with a wide supply voltage range, low power consumption and a four-channel independent design, it meets the logic processing requirements of various aerospace digital systems, making it the preferred component for lightweight, highly reliable and low-cost logic circuits in today’s aerospace sector.