smd resistor

SMD Resistor?

Surface Mount Device

·         SMD Resistor (surface mount technology),

·         SMD resistor stands for Surface Mounted Device,

·         smd resistor a type of tiny chip resistor,

·         Smd resistors not have color band,

·         Smd resistor have a numerical based resistance value,

·         Smd resistor have 3 digit value, 4digit value, and EIA-96 value.

Smd resistor calculation three digit:

   3-digit smd resistor

Surface mount Device Three Digit

·         The first two digit numbers will indicate the significant digits,

·         Third digit indicate multiplier, (power of ten 1ô) the number of zeros

·         Letter R, K, M is indicate Decimal Point, example-- 2R2 mean by 2.2Ω

·         R is indicate for smd resistor resistance value under 1000

·         K is indicate for smd resistor resistance value under 1000(kilo)

·         M is indicate for smd resistor resistance value under millions (Mega)

Examples:

·         330 = 33 x 10⁰   => 33 x 1 = 33Ω

·         100 = 10 x 10⁰   => 10 x 1 = 10Ω

·         102 = 10 × 10²   => 10 x 100 = 1000Ω or 1kΩ

·         524 = 52 x 10⁴   => 52 x 10000 = 520kΩ

·         2R2 = 2.2Ω

·         R23 = 0.23Ω

·         3M2 = 3.2mΩ

§  5.7Ω resistor value, written as--- 5R7

§  1Ω resistor value, written as -----1R or 1R0

§  0.67Ω resistor value written as -----R67or 0R67

Smd resistor calculation:four digit

4 Digit smd resistor:

Surface mount Device Four Digit

·         The first three digit numbers will indicate the significant digits,

·         Fourth digit is the multiplier, (power of ten 10^ô) the number of zeros

·         Letter R is indicate Decimal Point,

·         R is indicate for smd resistor resistance value under 1000

·         K is indicate for smd resistor resistance value under 1000(kilo

·         M is indicate for smd resistor resistance value under millions (Mega)

Examples:

·         5000 = 500 x 10⁰      => 500 x 10     = 5000 = 500Ω

·         4502 = 450 x 10²      => 450 x 100   = 45000 = 45kΩ

·         22R2   => 22.2Ω

·         R103   => 0.103Ω

      2M20  => 2.20mΩ

EIA-96, Smd resistor calculation:

·         EIA-96 SMD resistor

·         First two digit value find out in eia96 table

·         Third digit is the multiplier.

Example:

Surface mount Device 

·         26c   => 182 x 100 = 18.2kΩ

·         65f   => 464 x 100000 = 46.4mΩ

·         Note (first two digit ie 26 EIA96 value is 182 see the above table

And letter c value is 100)

EIA-96 smd resistor numerical and letter code below:-

letter codes below:-

Advantage of SMD resistor:

·         Very Smaller components.

·         Initial cost low      

·         Simply and faster automated assembly.

·         Better performance

Disadvantages of SMD resistor:

·         Repair is more difficult

·         Cannot used with breadboards

·         Damaged during the soldering

·         Unsuitable for large, high-power circuit

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