When Milliseconds Matter™

Electronic Ignition Safety Device (eISD).

eISD | eSAD | eSAF | ISD | FUZE | Multi-point

PacSci EMC / Products / Safe and Arm Devices / Electronic Ignition Safety Device (eISD)

Electronic Ignition Safety Device

How An Electronic Ignition Safety Device Works

The electronic Ignition Safety Device (eISD) contains an integral Exploding Foil Initiator (EFI) co-located in the same mechanical package, and therefore is close coupled (extremely low inductance and resistance) for extremely high Reliability functioning. The eISD is part of a distributed Electronic Safe and Arm Device (ESAD) with one Central ESAD and multiple Remote eISDs. The remote eISDs are Arm/Fire devices that receive a high voltage low current input from the central ESAD and charge up the high voltage circuitry to a desired voltage, then when commanded, eisd electronic igition safety devicedischarge this energy into an EFI. PacSci EMC has an EFI design that includes an internal Thru Bulkhead Initiator (TBI) capable of withstanding rocket motor back-pressure after functioning.

The eISD includes High Side Static P-Channel Switch, Low Side Static N-Channel Switch and an N-Channel Dynamic switch to comply with MIL-STD-1901A. These inhibits are unique to meet the safety board requirements. The dynamic inhibit is controlled by the proper sequence of the other two inhibits. A communication bus is utilized to select the appropriate remote ISD to function. Each networked bus allows for up to 48 multiple point remote eISDs to be connected. Each eISD is independently Armed and Fired with very precise timing of events. The unique inhibits can be controlled from Acceleration, Break-wires, switches etc. The PacSci EMC designs can be completely interchangeable with most standard legacy ISD designs.

What Our Electronic Ignition Safety Device Does

The eISD in used for mission critical applications where a reliable initiation device that can be networked from a central ESAD can be utilized for multi-point initiation. This architecture saves the customer weight and cost by utilizing one set of common sensors to share among multiple ignition safety devices. Traditionally, each eISD would have its own accelerometer and other environmental sensors. In addition to ignition systems this technology is directly applicable to fuzing applications. The safety requirements for multi-point fuzing is the same as for ignition. The differences are the utilization of a detonating EFI rather than a deflagrating EFI in each remote ESAD.

Where A PacSci EMC Electronic Ignition Safety Device Can Be Found

PacSci EMC has qualified, and is in production, on a dual output eISD for various missile platforms for over 15 years. This heritage was utilized to develop this new multi-point eISD (both Series 255 and Series 100 shown), with much of the same qualified components and processes from the production programs.

For product specific questions or to obtain data sheets, please email missiles@psemc.com or call (888) 995-5143 for immediate assistance.

Performance Characteristic Performance Level
Available Inputs
Dynamic Inhibit: The proper sequence of ENABLE and ARM will remove the dynamic inhibit
Ordnance Power: 28VDC
ARM: 10vac signal created from a safety switch
Enable: 30Bit encoded digital signal created from a proper Acceleration Profile
FIRE: SEA network bus, serial bus with 4 analog levels and encoded signals for device selection, status and FIRE
Output Time to first pressure: < 4milliseconds
Output pressure: 600 to 1500 psia (10cm3 test bomb)
The output can be tailored to meet specific application needs
No-Fire ≥ 500 Volts, 0.001 probability to fire at 95% SS lower confidence
Backpressure Capable of withstanding up to 10kpsi backpressure
Packaged Weight 37-50 grams
Operating Temperature -54°C to +71°C
Applicable Specifications Qualified to MIL-DTL-23659
MIL-STD-1901A for motor ignition
MIL-STD-1316 for fuzing applications
EFI qualifited to MIL-DTL-23659D

The eISD is a hermetic package with 1.22″ diameter and 3.51″ over-all length. The ISD utilizes a MIL-C-38999 13 pin connector, but other smaller connector styles can be substituted.eisd-technical

Performance Characteristic Performance Level
Available Inputs
Dynamic Inhibit: The proper sequence of ENABLE and ARM will remove the dynamic inhibit
Ordnance Power: 28VDC
ARM: Input Signal of varying voltage interfaces available
Enable: Input Signal of varying voltage interfaces available
FIRE: Input Signal of varying voltage interfaces available
Output Time to first pressure: < 4milliseconds
Output pressure: 600 to 1500 psia (10cm3 test bomb)
The output can be tailored to meet specific application needs
No-Fire ≥ 500 Volts, 0.001 probability to fire at 95% SS lower confidence
Backpressure Capable of withstanding up to 10kpsi backpressure
Packaged Weight 37-50 grams
Operating Temperature -54°C to +71°C
Applicable Specifications MIL-STD-1901A for Motor Ignition
Mil- Std-1316 for fuzing applications
EFI qualified to MIL-DTL-23659D

The eISD is a hermetic package with 0.75″ diameter and 1.5″ long.

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