ECG81

Dual NPN Silicon Bipolar Transistor Differential Amplifier Pair originally distributed by Sylvania/Philips ECG. This specialized discrete component packages two fully matched high-speed NPN transistors sharing a common substrate inside a hermetically sealed 7-pin or 6-pin TO-78 metal can package. It functions by utilizing closely aligned thermal coefficients and electrical traits to amplify fragile differential sensor signals cleanly from DC up to 250 MHz without injecting systemic background drift or current offset distortion. It was universally deployed in the precision front-end input buffer stages of radio transceivers, active telemetry bandpass filters, medical instrumentation tracking blocks, and early multi-channel laboratory oscilloscope panels. (Industry Exact Equals: Philips ECG81, NTE81, Motorola MJE15028, RCA SK3856, National Semiconductor MD2369, Solid State Devices 2N3728). [1, 2, 3]