Aerospace-Grade Radiation Hardened Product Family Offers Designers New Solutions for Emerging Low-Earth Orbit Commercial Applications

One of the more exciting things about the emerging new space sector is the launch of a large number of low-Earth orbit (LEO) satellites that are small and economically viable, while also being radiation-hardened and reliable, enhancing communications around the world and connect. Unlike in the previous satellite realm, where most missions were performed in geosynchronous orbits as high as 22,236 miles from Earth and expected to last more than 10 years, LEO satellites orbit much closer to Earth, no more than 1,300 miles away. . Because these satellites are relatively easy to replace, their working life is typically less than seven years.

Aerospace-Grade Radiation Hardened Product Family Offers Designers New Solutions for Emerging Low-Earth Orbit Commercial Applications

Author: Texas Instruments

One of the more exciting things about the emerging new space sector is the launch of a large number of low-Earth orbit (LEO) satellites that are small and economically viable, while also being radiation-hardened and reliable, enhancing communications around the world and connect. Unlike in the previous satellite realm, where most missions were performed in geosynchronous orbits as high as 22,236 miles from Earth and expected to last more than 10 years, LEO satellites orbit much closer to Earth, no more than 1,300 miles away. . Because these satellites are relatively easy to replace, their working life is typically less than seven years.

The main challenges for LEO satellite electronics design while staying within a tight budget and remaining competitive are:

• Reduce board size with smaller, more integrated components
• Find devices with short lead times for short cycle designs
• Use electronics that can withstand the harsh conditions of space

In addition to its existing product line of more than 250 Qualified Manufacturer List Class V (QMLV) confined space grade devices, TI recently introduced a new radiation tolerant product line (Space EP). The Aerospace EP product family includes plastic components designed for LEO satellites with a short operating life.

For designers new to space, space has specific challenges that terrestrial products cannot address, including:

• Radiation performance
• Typical control process and material variations in commercial off-the-shelf (COTS) devices
• Thermal cycling of satellites as they orbit the Earth
• Outgassing from unsealed plastic packages

TI’s Aerospace EP certification process addresses these challenges, eliminating the need for high-risk upgrade screening methods (previously used occasionally). Upgrade screening is the practice of electrical or environmental testing a device under conditions outside of the data sheet specifications. Screening for upgrades without a complete understanding of the device’s “recipe” and its test vectors can lead to field failures and the misconception that the satellite will function properly during the mission.

How Radiation Hardened Devices Reduce Risk

Using TI’s certified aerospace products, designers and device engineers can design and verify their boards without having to consider the specific considerations of satellites in the LEO aerospace environment. Some of the do’s and don’ts for aerospace EP products include:

• Controlled baseline process. TI manufactures each aerospace EP device in a single fabrication facility, assembly facility and test facility to reduce facility-to-fab variation in material mix, radiation tolerance and electrical specifications.
• Radiation lot acceptance testing. Aerospace EP devices are tested to ensure a total ionizing radiation dose (TID) of 20krad(Si) per wafer lot, eliminating any risk of lot-to-lot variability in radiation. These devices feature TIDs up to 30krad(Si) during qualification for additional radiation performance. (For projects requiring higher levels of TID performance, TI’s previous QMLV aerospace products are typically rated at 100krad(Si) or higher.)
• Gold Line. Aerospace EP devices use only gold bond wires, eliminating bond integrity and reliability issues that can occur with copper under tighter tolerance requirements.
• Wuxi whisker risk. Due to the harsh conditions in space, even with conformal coatings, tin whisker issues are a consideration. To avoid this risk, Aerospace EP products do not use terminals with high tin content. Instead, the coatings are nickel-palladium-gold or 63% tin/37% lead.
• range of working temperature. Aerospace environments typically require a temperature tolerance of -55°C to 125°C. Limiting aerospace EP devices to this temperature range eliminates the need for upgrade screening for the operating temperature range, which would void TI’s warranty and potentially damage devices used in flight.
• Harsh Environment Qualification. Aerospace EP products undergo supplemental certification processes specific to the aerospace environment, such as more stringent highly accelerated stress testing, temperature cycling testing for each device and reinforcement combination to meet NASA-led ASTM E-495 outgassing specification requirements.

Accelerate product launch timelines

With the quality and reliability of TI’s aerospace EP devices, designers can develop and validate new designs faster. In the device product folder on TI.com, we provide all radiation data as well as outgassing data and reliability reports for devices optimized for LEO requirements. Using our detailed reports can result in significant cost savings as significant expenditures are incurred in radiation testing, upgrade screening and defect-prone analysis when COTS products are used in LEO satellite applications.

Our reports include:

• Radiation report for TID including characterization data up to 30krad(Si) and radiation hardening assurance data up to 20krad(Si)
• Radiation reports for single-event effects, single-event lock-in data at 43MeVcm2/mg, and additional single-event transient characteristics for power management products.
• Outgassing and Reliability Reports that provide information on product flow, reliability data, traceability and outgassing testing. The information in this report helps to speed up board qualification and reduce the need for external qualification work, minimizing risk when choosing a new product and giving you confidence that your device will work right from the start.

Table 1 lists six aerospace EP devices in our product family, with more devices planned for major functional categories.

Table 1: Published Aerospace EP Devices

product

website

Order now from the TI store

TL7700-SEP Supply Voltage Monitor

data sheet

TL7700CMPWTPSEP

 

Radiation report

TPS73801-SEP 1A Low Noise Fast Transient Response Low Dropout Regulator

data sheet

TPS73801MDCQTPSEP

 

Radiation report

TLV1704-SEP Radiation Tolerant 2.2V to 36V Micropower Quad Comparator

data sheet

TLV1704AMPWPSEP

 

Radiation report

INA240-SEP 80V Low-Side or High-Side Zero-Drift Current Sense Amplifier with Enhanced PWM Rejection

data sheet

INA240PMPWTPSEP

 

Radiation report

SN55HVD233-SEP 3.3V Controller Area Network Transceiver with Standby Mode

data sheet

SN55HVD233MDTPSEP

 

Radiation report

SN65C1168E-SEP Dual Differential Driver and Receiver with ±8kV IEC ESD Protection

data sheet

SN65C1168EMPWSEP

 

Radiation report

For projects requiring a higher level of reliability or radiation tolerance assurance certification than the aerospace EP product line, TI will continue to invest in and offer the traditional aerospace product line in hermetic packaging.

The Links:   NL10276BC3034R LM190E08-TLH1 TFT-LCD

Bookmark the permalink.

Comments are closed.