Product Overview
Cornell Dubilier CM05ED560JO3 Dipped Mica Capacitor - 56 pF, 500 V
Condition
New. The photo shows a representative unit from our stock. Same or next business day shipping from our Idaho warehouse. Honest pricing, no nonsense. Online since 1999. We are here for our customers, with a no-hassle satisfaction guarantee.
Product Overview
A dipped mica capacitor in a dark red-brown moulded body, printed in silver-white ink across three lines: CM05 ED, then 560 JO3, then ADI. The character after the tolerance letter J is the letter O, not a zero, and it is the temperature-range character in the CM ordering grammar, so JO3 is correct as printed and correcting it to J03 would be the error. No brand name or logo appears on the face photographed; the owner catalogues these as Cornell Dubilier, and the marking follows the published CM ordering grammar for the CM case style, a code several makers used. Dipped micas in the CM05 case are the stable, low-drift small-value part in RF tuning and timing positions.
Key Features
- Capacitance 56 pF, from the code 560 read as 56 x 1 pF (per Cornell Dubilier's published dipped mica coding)
- Tolerance +/- 5 percent, from the tolerance letter J
- 500 V DC, from the voltage letter D
- Temperature range -55 to +125 C, from the letter O after the tolerance; characteristic E is the -20 to +100 C grade with drift of +/- (0.1 percent + 0.1 pF); the trailing 3 is the vibration grade (all per Cornell Dubilier's published CM ordering information)
- CM05 radial-leaded silvered mica case style: lead spacing 0.234 inch, about 5.9 mm, case length 0.500 inch +/- 0.012, maximum height 0.709 inch (published case data for the CM05 style, not measured here)
- Marking quoted verbatim: CM05 ED / 560 JO3 / ADI. No published table we located decodes ADI, so it is quoted and left alone
- Verify against Cornell Dubilier's published CM series ordering data before designing in.
Applications
- RF tank and tuning circuits that need a stable small value
- Oscillator and timing networks where drift matters
- Restoration of military-style and instrument boards built around CM case sizes
- Filter positions needing 56 pF at a comfortable 500 V margin
Frequently Asked Questions
How many should I order? Take what the circuit needs now; only 10 of these are on the shelf, so if a build calls for several it is worth ordering them together rather than coming back for the rest. Shipping is $8 flat rate and free on orders over $28, so small parts like this ship smartest as part of a larger order.
Is the part number JO3 or J03? It is JO3, with the letter O. In the CM ordering grammar the character following the tolerance letter is the temperature-range letter, and O is the -55 to +125 C range (P would be -55 to +150). The ink on this body reads equally as a zero or an O, but the grammar settles it, so search and order it as CM05ED560JO3.
A dipped mica in a case code the military wrote, still legible in silver ink after all this time.
