AEM, Inc. thick film fuses are produced for the aerospace industry in AEM’s MIL-STD-790 / AS9100 facility in San Diego, CA. AEM’s fuses have been selected by most major space programs and have been in orbit for the past 35-plus years with zero reported failures. AEM, Inc. is the sole QPL listed manufacturer of FM12/P600L series solid body fuses.
AEM’s High Reliability Solid Body Fuses
Benefits
- Thick film fusible element construction with glass arc suppressing system
- Designed and screened specifically for high reliability applications where failure is not an option
- QPL approved to MIL-PRF-23419/12
- Manufactured and screened entirely in AEM’s San Diego Facility
- Material and process traceability maintained for all fuse products (Group A and B screening and data standard)
- Supplied with gold plated or Sn/Pb terminal finishes
Features
- Operating temperature range of -55ºC to +125ºC
- Consistent minimum and maximum clearing times at overload currents regardless of vacuum conditions
- Solid body construction not subject to the de-rating factors of MIL-STD-975
- Solid body construction able to withstand greater vibration and shock exposure without damage
- Positive temperature coefficient of fusible element causing resistance to increase (prior to opening) preventing absolute short circuit to the power source
- Internal construction ensuring that arc, plasma, and vapor contained within the fuse package during clearing process
- Reliability plans for fuse products including ongoing 2000 hour life testing with over 10,000,000 life test hours completed with no failures reported
Applications
- Military and commercial satellites and spacecraft
- Protection of power supplies, batteries, and solar arrays
- Isolation of redundant and branch circuits
- Short circuit protection of squib and jettison circuitry
- Available in matched set configurations for higher current applications
Fuse Selection Considerations
- Applied DC voltage level
- Steady-state operating current level
- Ambient temperature/ PCB mount temperature
- Potential overload current levels and length of time at which fuse must open
- Surge in-rush and/or pulse currents
- Lead configuration required: radial, formed, surface mount, and flexible or solid leads
Fuse Model Options
FM12
- QPL listed to MIL-PRF-23419/12
- DC voltage ratings of 50V, 72V, and 125V
- Current ratings of 1/8A to 20A as single fuses
- Matched sets available for higher current requirements
- Formed, straight, and solder coated terminal options
- Overload interrupt and clearing time
- characteristics specified at 250%, 400%, and 600% levels
P600L 
- Commercial version of the QPL FM12 series fuses
- DC voltage ratings of 50V, 72V, 125V, 135V, and higher (consult factory)
- Current ratings of 1/8A to 20A as single fuses
- Matched sets available for higher current requirements
- Straight, flexible, and solder coated terminal options
- Overload interrupt and clearing time characteristics specified at 250%, 400%, and 600% levels
P700L 
- Surface mountable version
- Available on tape & reel for automated manufacturing processes
- Internal solder either standard (Sn96/Ag4
- (P700L) or high temp (Sn10/Pb88/Ag2
- (P700LH)
- DC voltage ratings of 50V, 72V, 125V, and higher (consult factory)
- Current ratings of 1/8A to 20A as single fuses
- Matched sets available for higher current requirements
- Wraparound reverse “J” tab terminal for surface mounting
- Overload interrupt and clearing time characteristics specified at 250%, 400%, and 600% levels
P800L 
- Slow blow version
- Designed to operate with slower clearing times
- DC voltages 72V and higher (consult factory)
- Current ratings of 2A to 15A as single fuses
- Matched sets available for higher current requirements
- Straight and solder coated terminal options
- Overload interrupt and clearing time characteristics specified at 250%, 400%, and 600% levels
SK406
- Formed terminal version of the P600L fuse models
- DC voltage ratings of 50V, 72V, 125V, 135V, and higher (consult factory)
- Current ratings of 1/8A to 20A as single fuses
- Matched sets available for higher current requirements
- Modified radial lead configuration allows for alternate surface mount flexibility
- Overload interrupt and clearing time characteristics specified at 250%, 400%, and 600% levels
SM1206
- Surface mount chip version (solid body construction)
- EIA 1206 case size
- DC voltages of 24V and 32V
- Current ratings 1/4A to 7A as single fuses
- Overload interrupt and clearing time characteristics specified at 250%, 400%, and 600% levels
- Sn/Pb plated end terminations
Non-Standard
For custom fuse model current ratings, voltage ratings, terminal finish, modules, and other alternate configurations, please contact the factory.