I need a Ultrahigh-Speed Switching Diode

[Lou-19]

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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[Robie Elms]

I suggest contacting Kenwood.

Robie - AJ4F

----- Original Message -----
From: "Lou" <[hidden email]>
To: <[hidden email]>
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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[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" <[hidden email]>
To: "Lou" <[hidden email]>; <[hidden email]>
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" <[hidden email]>
> To: <[hidden email]>
> 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
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
> http://mailman.qth.net/mailman/listinfo/elecraft
>
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
> http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com 

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