NASA Standard Initiator Equivalent

When your mission includes million dollar systems…
you can rely upon our space initiators to deliver.

The latest in our broad portfolio of initiators is the 103377-500, designed to meet or exceed the performance requirements of the NASA Standard Initiator. In mission-critical space and defense applications, a Space Standard Initiator provides a fast-acting, small-package energy source for converting electrical signals to a gas pressure output or high temperature flame and hot particles. We have engineered hundreds of variations of our high-quality, highly reliable Space Standard Initiators in the 103377 family. In particular, our 103377-500 meets stringent test and flight requirements while maintaining low cost and ease of availability.


Our Space Standard Initiators are designed for consistent reliability with a heritage dating back to the original Atlas Standard Initiator.


Manufacturing initiators for over half a century, ours perform at an incredibly low temperatures (-260°F to a high of +300°F). Our non-ITAR initiator provides high pressure energy for actuators, cutters, energetic trains and separations systems.

Have more questions about our Space Standard Initiator?

We would love to learn more about your program needs and how we can help support your mission.

Units readily available.


Using a two-pin, single bridgewire design, the 103377-500 Space Standard Initiator is engineered for maximum efficiency in harsh space environments. The initiator is electrically actuated by a minimum 3.5 amps application of all-fire current, producing a hot flame and gas output pressure of 525 to 775 psig within 10 milliseconds in a 10cc closed volume. In addition, the initiator is also designed to meet or exceed the performance requirements of the NASA Standard Initiator.


Since 1948, PacSci EMC has researched and engineered reliable, fast-acting energetic solutions for manned and unmanned space and launch vehicles, missiles and rocketsmilitary and commercial aircraft emergency safety systems, vehicle restraint systems and oil field exploration. Our legacy includes 55+ years of space flight history (beginning with the Titan – landing on Mars – and working on the next generation of launch vehicles) and over 1,000,000 space initiators delivered. Being on every successful consecutive ULA launch, 100+ and counting, while meeting and exceeding the same requirements as the NASA Standard Initiator (NSI) means you can fly with confidence. A quick overview of the space programs we have provided ordnance products for include:

  • X-15
  • Discoverer XII
  • NASA Space Shuttle
  • Atlas V
  • Delta IV
  • Titan IV
  • Taurus
  • Mars Rover
  • Wide-field Infrared Survey Explorer (WISE)


That’s right. Four nines is the demonstrated reliability for the PacSci EMC heritage initiator product family (103377-xxx) to date. With ZERO FAILURES to function 103377-Family, overall (~500 dash numbers)


*probability to function based on testing completed in-house
(DLAT, Qualification or Delta-Qualification)


  • All-Fire
    3.5 amps
  • No-Fire
    >5 Minutes @ 1 amp/1 watt
  • Bridgewire Resistance
    1.05 ± 0.10 ohms
  • Insulation Resistance
    50 Megaohms min. @500VDC
  • Electrostatic Discharge
    25 KV /500pF / 5000 ohm
  • Operating Temperature
    -260 °F to +300 °F
  • Hermetic Sealing
    1 x 10-6 cc/sec HE at 1 atm differential
  • Thermal Cycling
    -260 °F to +300 °F
  • Shock
    2600 G’s
  • Vibration (Random)
    -50.0 g RMS, 3 minutes/axis
  • Thermal Vacuum
    At 10-6 Torr from +300 °F to -260 °F for 2 hours
  • Thermal Stability
    -320 °F to ambient
  • Electrical Connection
  • Output Thread
  • Torque
    150 inch pounds
  • Header Integrity / Burst Pressure
    >35,000 lbs/in2
  • Applicable Specifications
    Qualified to
    Compliant with MIL-STD-1901A
    Considerations and Laboratory Tests


103377 Space Standard Initiator Evolution

For the past several decades, PSEMC has researched, designed and manufactured a line of fully reliable initiator solutions for space and defense missions — including those in the 103377 initiators family.
The 103377-500 Space Standard Initiator is a member of the 103377 initiators family. The baseline initiator of the family, 103377-3, was qualified in 1976 to MIL-I-23659, Revision C, General Design Specification for Electric Initiators.

The following year, a combination of four initiators (103377-3, 103377-5, 103377-7, and 103377-9), identical except for varying output was qualified to MIL-STD-1512, Design Requirements and Test Methods for Electrically Initiated Electro-Explosive Subsystems.

In 1990, the 103377-191 was designed to meet the envelope and functional performance requirements of the NASA Standard Initiator (NSI) and was qualified for use on the Boeing Delta launch vehicles. The success of the initiator family continued to grow as it was selected for a number of space and missile programs.

Since its original design, PSEMC has manufactured over 1,000,000 103377-family initiators, and is currently manufacturing 103377 initiators at a rate of 20,000± initiators per year.


103377-family of initiators can be tailored to fit many customized envelopes.
NSI Initiator 10337-500 Envelope

Our Space Standard Initiator is derived directly from the heritage of the Single Bridgewire Apollo Standard Initiator – instrumental in the success of the Apollo programs at NASA.

Apollo Standard Initiator Heritage