Looking for part # suggestions for a slug resistor. Need one part for 15K and one part for 20K OHM resistance. RESISTOR, 4.8K - 1/4 WATT
Hello @sblockowicz
Can you clarify what wattage you are needing and physical dimensions you may require for the 15K and 20K “slug resistor”.
Regarding the 4.8K ohm 1/4W are you needing a standard axial leaded such as RNF14BTD4K81-ND unfortunately these specifications were not in stock for 4.8K ohm 1/4W axial leaded.
Resistor body should be approx. 0.113" L x .065" Diameter. Each End cap should be approx .060" L x .085" Diameter. Total length of 0.233" L. The wattage on the drawing says 0.25 watts. Other info on drawing “4800 OHM, Carbon film core slug with end caps”
Can you clarify what you mean by “slug resistor”? I don’t recall ever hearing that term. Is it related to a particular family of end products, or does it have particular unique characteristics?
Is there a way to attach or paste a photo?
Is that a cylindrical surface mount (no leads) part?
No leads that I’m aware of
OK, that’s typically referred to as a “MELF” (Metal Electrode Leadless Face) resistor.
Ok can supply a few part #'s that would work for both 15K and 20K ohm resistance? Thanks
Both of these are 0.087" Dia x 0.228" L (2.20mm x 5.80mm) MELF package carbon film resistors.
- CMB02070X2002GB200 RES SMD 20K OHM 2% 1W 0207
- CMB02070X1502GB200 RES SMD 15K OHM 2% 1W 0207
If you can use thin film rather than carbon film, here are a few more options, and with higher quantities of the 15k option available than for carbon film.
Just to be clear, did you also need a 4.8k part, or was that just incidental in your drawing?
Here is are some possible options for MELF resistor of the requested size near the value of 4.8K ohm 1/4W.
Part Number MMF-25FRE4K75
4.75K ohm
Part Number MMF-25FRE4K87
4.87K ohm
I believe our best stocking option is 4.75K ohm 1W .087" diameter x .228" length.
Part number 749-MMB02070C4751FB200CT-ND
This is incidental. The drawing is almost 30 yrs old we just needed a similar resistor with the higher resistance values
OK, gotcha. The two I mentioned above should fit the bill then.
Do the two mentioned above have crystalloid coating?
The datasheet does not mention “crystalloid” coating explicitly. I’m not confidant that one will find a resistor which explicitly states that it has a crystalloid coating today, but I could certainly be wrong on that.
This is what it states about the coating:
DESCRIPTION
Production is strictly controlled and follows an extensive set of instructions established for reproducibility. A homogeneous and dense carbon film is deposited on a high grade ceramic body (Al2O3). Nickel plated steel termination caps are firmly pressed on the coated rods. Where applicable, a special laser is used to achieve the target value by smoothly cutting a helical groove in the resistive layer without damaging the ceramics. The resistors are covered by protective coating designed for electrical, mechanical and climatic protection. The terminations receive a final pure matte tin on nickel plating. Four (E24), respectively five (E96) color code rings designate the resistance value and tolerance in accordance with IEC 60062 (1).
The result of the determined production is verified by an extensive testing procedure performed on 100% of the individual resistors. This includes full screening for the elimination of products with a potential risk of early life failures according to EN 140401-803, 2.1.2.2. Only accepted products are laid directly into the blister tape in accordance with IEC 60286-3, Type 2a (1).
Here is a link to the product page for the CMB 0207 series on the Vishay website. There are a number of technical documents presented there, including the following one which extols the high reliability of the MELF package, in general. They also have a link there for technical questions where you may be able to inquire about crystalline coatings, specifically.
MELF Resistors - The World’s Most Reliable and Predictable, High-Performing Film Resistors