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A250F and A250F/NF High Density Charge Sensitive Preamplifiers

The A250F and A250F/NF are high density versions of the Amptek A250 Charge Sensitive Preamplifier.

The A250F includes the input FET (IFN152).

The A250F/NF does NOT include the input FET, it must be added externally.

Please refer to the A250 specifications for further information

Return to Hybrid Selection Guide

  • A250F +


    A250F – with Internal FET

    The A250F is a high density version of the Amptek A250 Charge Sensitive Preamplifier.

    The A250F includes the input FET (IFN152).

    A250F Pin Configuration

    Pin 1 Input
    Pin 2 FET Drain
    Pin 3 Ground and Case
    Pin 4 -Vs (-6 V Typical)
    Pin 5 +Vs (+6 V Typical)
    Pin 6 Output

    NOTES

    1. The internal feedback resistor Rf = 1 Gohm
    2. The internal feedback capacitor Cf = 0.25 pF
      Sensitivity (gain) = 175 mV/MeV (Si)
      4 V/pC
      0.64 µV/electron
    3. For lower sensitivity applications, Cf can be increased externally
    4. The internal 1 kohm resistor from Pin 2 to Pin 5 provides the FET with a drain current of IDS = 2.75 ma
      IDS can be increased by adding an external resistor (R < 1 kohm) from Pin 2 to Pin 5

  • A250F/NF +


    A250F/NF – with External FET

    The A250F/NF is a high density version of the Amptek A250 Charge Sensitive Preamplifier.

    The input FET is not included and must be added externally.

    A250F/NF Pin Configuration

    Pin 1 Feedback
    Must be connected to Gate of the FET.
    Pin 2 Input
    Must be connected to Drain of the FET.
    Pin 3 Ground and Case
    Pin 4 -Vs (-6 V Typical)
    Pin 5 +Vs (+6 V Typical)
    Pin 6 Output

    NOTES

    1. The internal feedback resistor Rf = 1 Gohm
    2. The internal feedback capacitor Cf = 0.25 pF
      Sensitivity (gain) = 175 mV/MeV (Si)
      4 V/pC
      0.64 µV/electron
    3. For lower sensitivity applications, Cf can be increased externally
    4. The external 1 kohm resistor from Pin 2 to Pin 5 provides the FET with a drain current of IDS = 2.75 ma
      IDS can be increased by reducing R < 1 kohm

  • PC250F Test Board +


    PC250F Test Board for the A250F or the A250F/NF

    Dimensions: 1.75 in X 1.75 in (4.5 cm X 4.5 cm)

  • Mechanicals +


    PC250F Test Board for the A250F or the A250F/NF

    Weight: 1.6 g with leads cut to 0.100 in (2.5 mm).

  • Documentation +