βM747

The βM747 series are dual operational amplifiers of the βA741 type, made by IPRS Băneasa [1].

The I.P.R.S. Băneasa Full Line Condensed Catalog (1990) lists the βM747E and βM747C, marked as preliminary data, as general purpose dual βA741-type operational amplifiers with internal frequency compensation, short-circuit protection, wide common-mode and differential voltage ranges, no latch-up, balanced offset null, and independent networks and V+ supply leads for a better isolation between the amplifiers and application flexibility [1]. In addition to the industry standard types, the I.P.R.S. series uses a thermally balanced input stage with cross-coupled transistor quads, which gives low VOS, TCVOS and TCIOS, insensitivity to output load conditions and a better channel separation; the βM747 can be used wherever several βA741-type amplifiers are used and where amplifier matching is required [1].

The catalog gives an input offset voltage of at most 3 mV (βM747E) and 6 mV (βM747C), an input bias current of at most 80 nA and 500 nA, a typical large signal voltage gain of 400 V/mV, a common-mode rejection ratio of at least 80 dB and 70 dB and a supply voltage rejection ratio of at least 86 dB and 77 dB [1]. Pins (TO-116, top view): 1 inverting input A, 2 non-inverting input A, 3 offset null A, 4 V−, 5 offset null B (printed „Offset nul B”), 6 non-inverting input B, 7 inverting input B, 8 offset null B, 9 V+ B, 10 output B, 11 NC, 12 output A, 13 V+ A, 14 offset null A [1].