Motorola Semiconductor Data Library, 5th Edition, 1970, p. 7-141.
MDA1332H, silicon (reference: MDA1330H family). Compensated
series-connected rectifier cells for high-voltage, single-phase, half-wave
circuit application. Each cell in the series string is shunted by a
high-voltage capacitor and resistor for equal distribution.
May also have a suffix: C - common cathode, U - common anode, D - voltage
doubler, or R reverse polarity
Specs:
Vrrm = 5kV (requires transient protection to operate here)
Vrms = 3.5 kV (at rated current from -55C to + 110C)
DC Blocking = 3 kV (established by Rshunt, not the diodes)
Ifsm = 250 A (peak single cycle surge)
Io = 2.5 A @ 40C
Avg Fwd Voltage Drop = 5.0 volts
Full cycle reverse current )max) = 3.0 mA
Conrad:
There are two pages of curves and one page mechanical drawing for this
horse. If you wish, I can scan them and email them to you.
73,
Dick K9FFK
-----Original Message-----
From: Dr. David Kirkby [SMTP:drkirkby@ntlworld.com]
Sent: Friday, April 12, 2002 7:05 PM
To: amps@contesting.com
Subject: [Amps] Re: [Moon-Net] Motorola HV rectifiers
Conrad G0RUZ wrote:
>
> I have been given some HV rectifiers which are probably c 1970-80s, they
> have the Motorola M logo and are marked MDA1332H. They are quite
substantial
> and I would like to know if anyone has any data for them.
>
> 73
>
> Conrad G0RUZ
I can't help you with data on those specific devices, but I would
personally be
wary of 1970's diodes that are 'quite substantial'.
...snip...
If your diodes have resistors across them, it is fairly easy to put an
upper
limit on ratings (recall P=V^2/R). That would be the DC holdoff voltage.
...snip...
--
Dr. David Kirkby PhD,
email: drkirkby@ntlworld.com
web page: http://www.david-kirkby.co.uk
Amateur radio callsign: G8WRB
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