One call our customer service department has been getting more of recently is, people thinking they have gotten the wrong resistor because the body of the resistor is smaller than similar resistors they have received in the past. Often when the customer reviews the physical specifications in the data sheet they find they have the correct part.
Many of the through hole resistor manufacturers have started to come out with mini lines to meet an ever growing demand for smaller and smaller parts. You will find that certain series of resistors are able to have the same resistance values and power ratings in a package size that is smaller that previously built.
Take for example Stackpole part S100KQCT-ND and Stackpole part CF14JT100KCT-ND as you see in the below chart there two parts are electrically the same part, however physically the S100KQCT-ND is much smaller.
|Power||1/4 watt||1/4 watt|
|Composition||Carbon Film||Carbon Film|
|Features||Flame retardant Coating
|Flame retardant Coating
|Oper Temp||-55°C to 155°C||-55°C to 155°C|
|Physical Size||2.3mm x 6mm||1.7mm x 3.3mm|
Here is a picture of the two resistors mentioned above next to one another.
If you have concerns over the values of your specific resistor please refer to the individual data sheet.