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Tektronix 5A21N
1 MHz differential amplifier
5A21N front view

Compatible with 5000-series scopes

Produced from 1971 to 1991

Manuals – Specifications – Links – Pictures

The Tektronix 5A21N is a high-gain differential amplifier plug-in for 5000-series scopes. In addition to inverting and noninverting differential inputs, it also features a current probe input for 125-turn probes such as the P6021. Unlike more advanced differential amplifier plug-ins, it has neither a DC offset control nor a built-in comparison voltage source, and the HF bandwidth limit is fixed to 10 kHz when active.


Bandwidth 1 MHz
Deflection 50 μV/Div to 5 V/Div or 0.5 mA/Div to 0.5 A/Div, 1-2-5
Input impedance 1 MΩ // 47 pF