Specs on a couple of old parts needed

Hello John,

From the 1972 Philips Pocketbook, page B39:

BTW47 1000RW

Vdrm !000V If(av) 14A If(rms) 25A Itrm 150A Itsm 220A Tj 125 deg C

I remember the PA40 but can't put my finger on any data at the moment.

-- Regards, Chas.

To Email, replace 'xxx' with tango papa golf.

"John Crighton"

** From a Philips General Cat: 1976:

BTW47RM = a 16 amp (average), 1000 volt thyristor.

TO48 pack, metric thread, anode to case.

Triggering: 100mA @ 3.5 volts (worst case)

** From memory, that one is a 25 amp, 400 volt job.

Think I used one ( or was it a PA25 ?) in a Playmaster 128 stereo power amp in 1971.

Anyone remember that design ??

.............. Phil

On Wed, 08 Jun 2005 10:35:28 GMT, john snipped-for-privacy@tpg.com.au (John Crighton) put finger to keyboard and composed:

It is substituted by an NTE5342 (40A, 600V):

Note that the NTE part will have a rating equal to or better than the original.

- Franc Zabkar

--
Please remove one 's' from my address when replying by email.

800V 25A

If you don't have to use a stud type a suitable substitute would become much cheaper -- eg 2N6509 from Wes (TO220).

No idea, but anything else that meets or exceeds the voltage and current spec ought do the job as a rectifier. There's no shortage of options unless you're bound by some sort of odd encapsulation.

1995 actually, International Diode and Thyristor Index.

-- John H

Oops... that's 1000V 25A. Looks like you're stuck with a stud type. Wiltronics are a good source for a substitute.

-- John H

BTW47 1000RM:

1000V 14A, 3V drop @ rated I, made by AEI and Mullard

Hello John H, Frank, Mark, Chas and Phil, thanks for your efforts in looking up the info in your data books. I appreciate that. Regards, John Crighton Hornsby