Systems, Subsystems & Solutions

7444 Series Passive Audio Bandpass Filter

The 7444 series are passive bandpass filters designed for use in signalling, monitoring and supervisory systems where safety is critical and the filter must be stable over the range of temperatures experienced in an unheated, non air-conditioned vehicle exposed to all North American environmental conditions.

Features: 
  • The safety critical design feature provides that if any internal component becomes an open or short circuit, the output signal falls by at least 18 dB below normal.
  • The temperature stability is enhanced by selecting the resonant components such that the temperature coefficient of inductance is the inverse of the temperature coefficient of capacitance.  The components are subjected to prolonged temperature cycling, before tuning, so as to minimize the disaccommodation factor of the ferrite materials.
  • The filters are hermetically sealed in a plated steel can for long life under a wide range of environmental conditions including high relative humidity.
  • All filters will tolerate 350 volts peak-to-peak at out of band frequencies.
  • The filters are PC board mountable with solderable pins in glass to metal seals.  There are four 8-32 threaded inserts for secure mounting when subjected to vibration.

7443 Series Passive Audio Bandpass Filter

The 7443 series are passive bandpass filters which have been designed for safety critical applications.  They are used in signalling, monitoring and supervisory systems where the information is carried by signals, typically in the audio frequency band.  The filters are designed to operate over the range of temperature experienced in a non air-conditioned, unheated vehicle exposed to the temperature extremes found anywhere in North America.

Features: 
  • Safety critical feature provides output signal level falls by at least 18 dB below normal if any internal component becomes shorted or opens
  • Filters are mounted in hermetically sealed steels cans that provide a long life under adverse environmental conditions including high relative humidity.
  • Temperature stability is maximized by prolonged temperature cycling, prior to tuning, to reduce the disaccommodation factor of the ferrite core materials.  Capacitors are selected whose temperature coefficient of capacitance is the inverse of the temperature coefficient of inductance of the coils or transformers.
  • All filters tolerate 350 volts peak-to-peak at frequencies outside the pass band
  • Filters are fitted with an octal plug to make the input and output connections.  The filters have four 8-32 studs to provide secure mounting and withstand vibration.

7439-7440 Series 1000 Base T Dual Port Magnetic Modules

The 7439-7440 Series 1000 Base T Dual Port Magnetic Modules is designed for Ethernet 100/1000 Base-T full duplex applications.

Features: 
  • Supports 4 pairs of category 5 UTP cable
  • Cable interface for isolation and low common mode emissions
  • Compliant with IEEE 802.3ab standard for 1000 Base-T
  • Supports 1:1 Turns Ratio Transceivers
  • Isolation voltage: 1500 Vrms

7431 Input/Output Transformer

The 7431 Input/Output Transformer is designed to interface with the Motorola MC145423 which combines the functionality of the UDLT-1 and UDLT-2.

Features: 
  • Low cost
  • Tape and reel available for high volume production

7398 Coil Suppressor Assembly

The 7398 Coil Suppressor Assembly offers flexible leads for internal mounting across coil and high energy loss in Zener diode assures rapid contact release.

Features: 
  • Fully tested after burn in
  • High resistance to shock and vibration

7390 Hybrid Transformer

The 7390 Hybrid Transformer is designed to be used in a 2-coil hybrid transformer configuration.

Applications:

  • Hybrid interface between the 2-wire loop and the 4-wire circuit, and where DC handling capability is required on the 2-wire side
Features: 
  • Low Insertion Loss
  • High Return Loss
  • DC capability
  • High Transhybrid Loss

7366 Ultra Wideband Transformer

The 7366 Ultra Wideband Transformer is used as a noise injection transformer.

Features: 
  • Operating temperature range 0 to 70°C
  • Low cost

7352 Modem Transformer

The 7352 Modem Transformer is designed for V.90 applications.

Features: 
  • Designed to reflect 600 ohms on PRI with 290 ohms on SEC
  • Low distortion, specifically designed for V.90 applications

7336-1 RF Wideband Transformer

The 7336-1 RF Wideband Transformer is a compact SMD wideband transformer with excellent dielectric strength to meet North American and European standards for reinforced insulation.

Features: 

Meets safety codes:

  • UL 1950
  • CSA C22.2 No.950
  • BSI & TUV EN 60950

7329-7325 Series Isolation Transformers for 10 Base-T

The 7329-7325 Series Isolation Transformers for 10 Base-T are available with common mode chokes for EMI suppression.

Features: 
  • Exceeds IEEE 802.3, 10 Base-T specifications
  • Isolation voltage 2000 Vrms
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