1N3024B case DO-41 - Page 1
Forum section: electronics / general

author: frantisek
author_rank: Regular Contributor
timestamp: September 26, 2019, 09:26:56 am
content: Hello and please help. For repair I need 1 - 2 pieces of diode 1N3024B, case DO-41. Only this type. Please help !!

author: coromonadalix
author_rank: Super Contributor
timestamp: September 26, 2019, 10:02:23 am
content: its a standard 15v 1w zenner you should be able to find it easily on any part suplier ?

author: frantisek
author_rank: Regular Contributor
timestamp: September 26, 2019, 10:33:42 am
content: Standard is definitely not. It takes a look at the datasheet. Mouser does not have in stock, plus a minimum of 262 pieces, excluding the nonsensical and exaggerated price.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: September 26, 2019, 10:53:06 am
content: I don't get it, how is it different from a 1N4744B?Tim

author: amspire
author_rank: Super Contributor
timestamp: September 26, 2019, 10:56:17 am
content: Quote from: frantisek on September 26, 2019, 10:33:42 amIt is a standard part - suppliers often don't bother stocking every type of 15V 5% 1W zener ever made since they tend to be totally interchangeable. If you cannot find the 1N3024B, it is probably because it is an obsolete device.Is there any reason not to use the easily available 15V 5% 1W DO41 zeners such as the 1N4744A or the BZX85C15?

author: frantisek
author_rank: Regular Contributor
timestamp: September 26, 2019, 11:50:59 am
content: These are the temperature coefficient and other parameters. If I put there any of your recommended, it's voltage not 15, but 16.5V. The diodes are two in series, plus minus 15V.https://cz.mouser.com/datasheet/2/268/LDS-0285-1592720.pdf

author: YU7C
author_rank: Regular Contributor
timestamp: September 26, 2019, 12:13:22 pm
content: https://eu.mouser.com/ProductDetail/Microchip-Microsemi/JANTX1N3024B-1?qs=sGAEpiMZZMtQ8nqTKtFS%2FEsjzpfGwHO1dBfi2%252Bi8KItQziNCYgHfqQ%3D%3DI see 41 can dispatch.

author: jaromir
author_rank: Unknown
timestamp: September 26, 2019, 12:58:07 pm
content: If you insist on using original diode (instead of jelly-bean 5c zener) and want to order from Mouser and want to avoid shipping expenses and customs, you may use EU aggregator/reseller -http://www.mausel.eu/?lang=csI used their services a few times, with no problems whatsoever.

author: amspire
author_rank: Super Contributor
timestamp: September 26, 2019, 01:11:47 pm
content: Quote from: frantisek on September 26, 2019, 11:50:59 am1N3024B: 15V +/- 5% at 17mA Coefficient: 0.088 %/C MaximumBZX85C15 15V +/- 5% at 15mA Coefficient: 0.09 %/C MaximumThe lower test current will mean at 17mA, the BZX85C15 will be about 15.02V +/- 5%There is no difference. These diodes are as close to identical as you can have for a 5% device. Where are you getting the 16.5V from? I do not know what you mean by "The diodes are two in series". The 1N3024B is just a single junction with a normal diode drop voltage less then a volt in the forward direction. It is not a special zener diode in any way.If two of either diode are back to back in series, you will get about 15.6V with a slightly lower temperature coefficient. The positive coefficient of the reverse zener will swamp out the negative coefficient of the forward zener.

author: frantisek
author_rank: Regular Contributor
timestamp: September 26, 2019, 05:35:50 pm
content: t was the first thing I did that I replaced the defective 1N BZX. The result was 16.5V instead of 15V. It is a source plus minus 15V, the center of these diodes is on the ground. That's why I started looking for the original.

author: thm_w
author_rank: Super Contributor
timestamp: September 26, 2019, 09:44:26 pm
content: Post a schematic, double check you have the right part, maybe test it out of circuit.

author: amspire
author_rank: Super Contributor
timestamp: September 26, 2019, 11:17:20 pm
content: Quote from: frantisek on September 26, 2019, 05:35:50 pmIf you have 16.5v across a 15V zener, there is something wrong with the circuit. The diodes are rated at 1W which means a maximum current of 66mA. In practice, you would have under 30mA. To get 16.5V, you have to be putting much more then 66mA through the zener diodes and the diodes will fail.