Need a replacement for an out of stock part

[bart]

I made a newbe error!
I designed a circuit, ordered the PCBs and, as I was about to place my order for the components, only then I discovered I had included a part that is out of stock. It’s not due in for 7 months. I have looked at alternative parts and found what should be 9 or 10 parts that look to me to be direct replacements but am confused because usually your web site recommends drect replacements but didn’t in this case.

The part in question is 255-1117-ND
Panasonic part JW2SN-DC12V

It has a 12 volt coil with DPDT connections for output. The current capacity for the points is 5 amps. This capacity is more than I need. 2 amps would be just fine. I do need a reliable unit. It is really important the the physical dimensions duplicate the Panasonic part! I really don’t want to reorder the boards.

The prospective parts I have looked at are:
SPR2CDC12K
PR16-12V-540-2C
PR21-12V-400-2C
PC375-2C-1254-X
J114FL2CSB12VDC.4
JW2SN-B-DC12V
G2RL-2 DC12
G2RL-2-CF DC12
RT 424012

They all seem to have a contact form of 2 form C. Is that the “footprint” for the holes on the PCB?

I’m overwhelmed by the number of items I found. I’m thinking I must be doing this wrong.

Bart

[PaulHutch]

@bart

They all seem to have a contact form of 2 form C. Is that the “footprint” for the holes on the PCB?

No, that’s the contact arrangement, see:

Understanding Form A, Form B, Form C Contact Configuration

What does it mean in relays or reed switches when the contacts are listed as Form A, Form B or Form C? This is a short hand way of describing contact configuration. A “Form A” would mean the contacts are normally open when the coil of the relay is not energized or the there is no magnetic field nearby in a reed switch. A “Form B” would mean the contacts are normally Closed when the coil of the relay is not energized or the there is no magnetic field nearby in a reed switch. A “Form C” would …

AFAIK, to find a matching PCB footprint requires manually comparing the drawings for the alternatives to the original. This is one of those incredibly long boring tasks I end up doing before PCB layout so that there are known substitutes for my employers products’.

[rick_1976]

@PaulHutch

to find a matching PCB footprint requires manually comparing the drawings for the alternatives to the original.

Pretty much, yes. This is one area in which the print catalog (RIP) mopped the floor with modern web presentations.

@bart

because usually your web site recommends drect replacements

Suggested substitutions are only suggestions, and should never be taken at face value without verification from the relevant datasheets.

FWIW, PB968-ND has a similar pattern, albeit on inchified dimensions. Might be close enough for non-production purposes.