RES: [sdiy] Left over transistor in a transistor array

[Luís Marka]

Hi David,
Actually there is a reccomendation for connecting the *emitter* of Q5 (pin 13) to the most negative point in the circuit in the component datasheet:

"NOTES:
1. The collector of each transistor of the CA3045 and CA3046 is isolated from the substrate by an integral diode. The substrate (Terminal 13) must
be connected to the most negative point in the external circuit to maintain isolation between transistors and to provide for normal transistor action."

http://www.alldatasheet.com/datasheet-pdf/pdf/66311/INTERSIL/CA3046.html

Luis Marka

-----Mensagem original-----
De: synth-diy-bounces at dropmix.xs4all.nl
[mailto:synth-diy-bounces at dropmix.xs4all.nl]Em nome de David Ingebretsen
Enviada em: sexta-feira, 26 de junho de 2009 15:44
Para: synth-diy at dropmix.xs4all.nl
Assunto: [sdiy] Left over transistor in a transistor array


I found a circuit I want to build which uses a CA3046 transistor array. One transistor is unused and in the schematic, the base and emitter are left disconnected and the collector is tied to -15 volts.

What is "good" practice for the pins of an unused transistor in an array like this? 

David


David M. Ingebretsen M.S., M.E.
Collision Forensics & Engineering, Inc.
2469 East Fort Union Blvd. STE 114
Salt Lake City, UT 84121
www.CFandE.com

801 733-5458 Office
801 842-5451 Cell

dingebre at CFandE.com
dingebre at 3dphysics.net




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