Orange Dipped Radial Film Capacitor, 0.039uF 100V 10%, Maker Not Identified
Never used. The original pack has been opened, or the quantity was split off a full reel or tube. Leads are original and unclipped.
New old stock, open stock on the grading scaleSend the quantity you need. You get a quote back with shipping before anything is charged.
Video
Filmed on the bench. Sound is stripped from product clips.
- 0:05
Specifications
| Specification | Value |
|---|---|
| Identification | |
| Part number | RJF7RSJN |
| Manufacturer | Not recorded |
| Condition | New old stock, open stock |
| Date code | Not recorded |
| Package | Radial leaded, squared off dipped body |
| Country of origin | Not recorded |
| Family | Not recorded |
| Stock number | RJF7RSJN |
| Markings as read | |
| Marking, first line | Digit 2 inside a printed circle, then 067 |
| Marking, second line | .039K |
| Marking, third line | 100V |
| Brand name on body | None |
| Type or catalogue number on body | None |
| What the markings establish | |
| Capacitance | 0.039microfarad |
| Capacitance in picofarads | 39,000 pF, the usual 393 code written out in full |
| Capacitance tolerance | 10% |
| Tolerance band at nominal | 35,100 to 42,900 pF |
| DC voltage rating | 100VDC |
| Form, observed | |
| Body | Orange epoxy dipped coating, squared off rectangular profile |
| Lead style | Radial, two leads from one face |
| Dielectric | Not stated on the body. This form is normally built on polyester film |
| Outer foil band | None printed on this body |
| Sprague 225P at the same rating, reference only, not verified for this part | |
| Reference part number | 225P39391W |
| Reference body size | 0.70 by 0.42 by 0.30 in (17.8 by 10.7 by 7.6 mm) |
| Reference AC rating | 70 VAC RMS at 60 Hz for the 100 VDC part |
About this part
Three printed lines, and it is worth being exact about what they establish. A digit 2 inside a circle, then 067. Then.039K. Then 100V. The last two are unambiguous: 0.039 microfarad, K for plus or minus 10 percent, 100 volts DC. The rest is inference, labelled as inference.
The body carries no brand name and no type number, and that absence is the point. The squared off orange dipped shape is the one everybody associates with the Sprague Orange Drop, but Sprague printed its own name and the series number on those, and neither is here. A shape is not a maker's mark.
The two unexplained codes, as probabilities rather than facts. 067 is most likely a lot or house number: it fits no capacitance, tolerance, voltage or date code convention, and parts built to a customer drawing routinely carry the customer's number alone. The circled digit is most likely a plant or line mark.
A meter settles the rest. Capacitance should read between 35,100 and 42,900 pF, and a dissipation factor of a few tenths of a percent at 1 kHz is normal for polyester film. A Sprague 225P at this rating measures 0.70 by 0.42 by 0.30 inches, so calipers will tell you whether the case matches, and never who made it.
Nine pieces from one lot, unused. Check the coating for chips and hairline cracks, since it is the moisture barrier, and check the leads for tarnish. Work to 100 volts DC: the body states no AC rating.
Questions about this part
Who made this capacitor?
Not established. The body carries a value, a tolerance letter, a voltage, a circled digit and a three digit number, and no maker name and no series number. It is sold as an unbranded part and is priced as one.
Is this a Sprague Orange Drop?
Unverified, and it is not sold as one. The squared off orange dipped radial form is the Orange Drop shape, but Sprague printed both SPRAGUE and the series number, for example 225P, on the face of its parts, and this body has neither. The form is consistent with that family. Consistent with is not the same claim as is.
What does the circled 2 mean?
Most probably a plant, line or inspection mark rather than anything electrical. Sellers of vintage stock do list Sprague 225P Orange Drops of this period as circle 2 parts, so a circled 2 is a marking that appears on that family, but a circled digit on its own identifies nobody and we have found no manufacturer document that defines it. Another capacitor from the same source carries the same circled 2 and is identified as a Sprague by its own printed type designation, which makes a Sprague house mark a more plausible reading than it was, though two parts sharing a mark is evidence about a shelf and still puts no name on this body.
What does 067 mean?
Most probably a lot, run or house number. It matches no capacitance code, no tolerance letter, no voltage code and no standard four digit year and week date code. Capacitors built to a customer drawing very often carry the customer's number in place of the maker's, which would also explain the missing brand. That is a probability, not a finding, so dateCode is left empty on this listing.
What does .039K tell me?
The value written out rather than coded: 0.039 microfarad, which is 39,000 picofarads or 39 nanofarads. K is the standard tolerance letter for plus or minus 10 percent, so a good part measures between 35,100 and 42,900 pF.
How do I verify one before I fit it?
Measure capacitance on a bridge and expect it inside the 10 percent band. Measure dissipation factor at 1 kHz, where a few tenths of a percent is normal for polyester film and a high figure suggests moisture in the winding. Check insulation resistance at rated voltage. Inspect the coating for chips and hairline cracks, since that coating is the moisture barrier.
How many are there and are they all the same?
Nine pieces, unused, from one lot with the same printing on each. They are sold individually at the per piece price. If you need a matched set for a tone stack or a filter, say so on the order and they can be measured and picked from the nine.