HSN-1000 NUCLEAR EVENT DETECTOR

DDC’s HSN-1000 radiation-hardened Hybrid Nuclear Event Detector (NED) senses ionizing radiation pulses generated by a nuclear event, such as the detonation of a nuclear weapon, and rapidly switches its output from the normal high state to a low state with a propagation delay time of less than 20ns. The active low Nuclear Event Detection signal (NED) is used to initiate a wide variety of circumvention functions, thus preventing upset and burnout of electronic components. The NED output is also used to initiate both hardware and software recovery. This high-speed, 14-pin hybrid detector is used in electronic systems as a general-purpose circumvention device to protect memory, stop data processing, and drive power supply switches as well as signal clamps.

The HSN-1000 is guaranteed to operate through three critical environments: ionizing dose rate [10¹² rad(Si)/s], gamma total dose [10⁶ rad(Si)], and neutron fluence [5 x 10¹³ n/cm²]. In addition, the device is designed to function throughout the transient neutron pulse. The hybrid’s discrete design ensures a controlled response in these radiation environments as well as immunity to latch-up. Each HSN-1000’s detection level and functionality are tested in an ionizing dose rate environment. A certificate is provided with each serialized hybrid, reporting the radiation test results and guaranteeing its performance. The device is also a lot qualified in the total dose and neutron environments to ensure performance.

The detection threshold of the HSN-1000 is adjustable within the range of 2 x 10⁵ rad(Si)/s to 2 x 10⁷ rad(Si)/s. This detection level can be preset by DDC or adjusted by the user. Less than a 30% variation in detection threshold can be expected over the entire operating temperature range.

Features:

• Detects ionizing radiation pulses
• 100% tested/certified detection threshold level
• Adjustable circumvention period
• 100% testable with built-in test
• Detection threshold adjustability
• Single +5V operation
• Radiation hardness guaranteed
• Compliant to MIL-PRF-38534 Class H
• Flat pack (F) or DIP (L) packages

Radiation Hardness Characteristics:

• Dose Rate (operate-through): 1 x 10¹² rad(Si)/sec
• Total Dose: 1 x 10⁶ rad(Si)
• Neutron Fluence: 5 x 10¹³ n/cm2
• Approximate Detection Range: 2 x 10⁵ – 2 x 10⁷ rad(Si)/sec
• DDC Specified, Controlled, Tested and Guaranteed

Source:  HSN-1000 NUCLEAR EVENT DETECTOR