When Milliseconds Matter™

103377-500 Space Standard Initiator.

Reliability defined

PacSci EMC / Products / Pyrotechnic Initiators / 103377-500 Space Standard Initiator

103377-500 Space Standard Initiator


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.

How A 103377-500 Space Standard Initiator Works

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 rockets, military 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)


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 10337 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.


  • All-Fire

    3.5 amps

  • No-Fire

    >5 Minutes @ 1 amp/1 watt

  • Bridgewire Resistance

    1.05 ± 0.10 ohms

  • Insulation Resistance

    50 Megohms 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 gRMS, 3 minutes/axis

  • Thermal Vacuum

    At 10-6 Torr from +300 °F to -260 °F for 2 hours

  • Thermal Stability

    -320 °F to ambiant

  • 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-family of initiators can be tailored to fit many customized envelopes.

10337-500 Space Standard Initiator Technical Envelope


Need more information or have a specific requirement you would like us to meet?
Please submit your information here or for immediate assistance call (888) 995-5659.

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