[Elecraft] I need a Ultrahigh-Speed Switching Diode

[David Cutter]

It doesn't sound so different to 1N4148 if you can deduce the surface mount 
version which will probably have similar capacitance.  Vrrm a bit lower, 
but...for an urgent situation I would just bend one up and try it.

David
G3UNA

----- Original Message ----- 
From: "Robie Elms" <aj4f at houston.rr.com>
To: "Lou" <ke4uyp at tampabay.rr.com>; <elecraft at mailman.qth.net>
Sent: Thursday, July 19, 2007 3:52 PM
Subject: Re: [Elecraft] I need a Ultrahigh-Speed Switching Diode


>I suggest contacting Kenwood.
>
> Robie - AJ4F
>
> ----- Original Message ----- 
> From: "Lou" <ke4uyp at tampabay.rr.com>
> To: <elecraft at mailman.qth.net>
> Sent: Thursday, July 19, 2007 9:33 AM
> Subject: [Elecraft] I need a Ultrahigh-Speed Switching Diode
>
>
> Can someone please help me locate this Diode it is used as a surge 
> absorption Diode in the remote amplifier T/R switching circuit of a 
> Kenwood TS-50S HF transceiver. I was using the T/R switching  port to 
> switch my MFJ-1026 Deluxe Noise Canceller.
>
> It was working O. K. and I then turn the radio off. The next time I turned 
> the radio back on it did not work. This was about two or three days later. 
> The radio was physically disconnected from the antenna but between the 
> time the radio was turned off then turned back on again there was a bad 
> electrical storm.
>
> The T/R switching has went permanently shorted in the transmit mode. The 
> radio is working OK I can transmit and receive ok. Any help locating this 
> part would be greatly appreciated.
>
> Lou KE4UYP
>
> The Diode is a Sanyo-- Ultrahigh-Speed Switching Diode- LFB01
>
> Silicon Planar Leadless Type
>
> Dimensions
>
> 1.4mm diameter
>
> 3.4mm long
>
> Specifications
>
> Absolute Maximum Ratings at Ta = 25°C
>
> Electrical Characteristics at Ta = 25°C
>
> Package Dimensions
>
> Features
>
> Highly reliable leadless glass sleeve structure.
>
> Very small size.
>
> Capable of being suface-mounted.
>
> Forward voltage : VF max=1.2V.
>
> Interterminal capacitance : C max=3pF.
>
> Reverse recovery time : trr max=4ns.
>
> Parameter Symbol Conditions LFB01
>
> Peak Reverse Voltage VRM 90 V
>
> Reverse Voltage VR 80 V
>
> Peak Forward Current IFM ® 480 mA
>
> Average Rectified Current IO ® 150 mA
>
> Surge Curent IFSM ® 2 A
>
> Allowable Power Dissipation P ® 300 mW
>
> Junction Temperature Tj ® +175
>
> Storage Temperature Tstg ® –65 to+ 175 °C
>
> Parameter Symbol Conditions
>
> Ratings Unit
>
> min typ max
>
> Forward Voltage VF IF=100mA 1.2 V
>
> Reverse Current IR1 VR=30V 0.1 µA
>
> IR2 At each VR 0.5 µA
>
> Interterminal Capacitance CVR=0V, f=1MHz 3 pF
>
> Reverse Recovery Time trr VR=6V, IF=10mA, RL=50W  Max 4 ns
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