Pulse Amplifier A275

The A275 is a high performance hybrid differential op-amp developed as a pulse amplifier for spaceborne nuclear instrumentation.


Its low power dissipation (15 mW), high slew rate (100 V/µs), and low input noise (4 nV/Ö Hz), make it ideal for use in a wide range of op-amp applications. The A275 is packaged in a standard 14-pin hybrid DIP and is also available in a SIP as the A275F. 


  • Power 15 mW
  • Slew Rate 100 V/µs
  • Input Noise 4 nV/ÖHz
  • Stable DC Operation
  • 200 MHz Gain- Bandwidth Product
  • High Reliability Screening
  • Unity Gain Stable 


  • Space Instrumentation
  • Portable Instrumentation
  • Portable Instrumentation
  • Nuclear Instrumentation
  • Precision Active Filter Design
  • Pulse Shaping

Connection diagramm:

Application Notes

Operating Notes

Circuit Layout Considerations
Due to the high bandwidth of the A275, care should be taken in circuit layout. In general, ground plane construction is recommended. Input and output lines should be well separated and in most cases shielding will be necessary. Grounding the physical case of the A275 (in addition to Pin 7) to the ground plane
can be used to avoid oscillations or electronic pick-up.
The A275 can be tested as a shaping amplifier by using the circuit shown in the next page. The PC-275 Test Board (shown below) accommodates three (3) A275s and a BLR1 and produces a 5 pole pulse with 1 μs risetime (2.3 μs peaking time).