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2011 ROHM Co., Ltd. All rights reserved.

2011.12 - Rev.G

Low Ohmic Thick Film Chip Resistors

MCR18 (3216 size (1206 size) : 1 / 4W)

Features

1) Power rating of 1 / 4W

2) Highly reliable chip resistor Ruthenium oxide dielectric offers superior resistance to the elements.

3) Electrodes not corroded by soldering

Thick film makes the electrodes very strong.

4) ROHM resistors have approved ISO9001- / ISO/TS 19649- certification.

Ratings

Design and specifications are subject to change without notice. Carefully check the specification sheet before using or ordering

it.

0.25W (1 / 4W)

−55

at 70

Item

Conditions

Specifications

Rated power

Rated voltage

Operating temperature

Nominal resistance

See Table 1.

Power must be derated according to the power derating curve in

Figure 1 when ambient temperature exceeds 70

The voltage rating is calculated by the following equation.

If the value obtained exceeds the limiting element voltage,

the voltage rating is equal to the maximum operating voltage.

E: Rated voltage (V)

P: Rated power (W)

R: Nominal resistance (

Ω)

E

= P×R

0

20

40

60

80

100

−55

0

70

100

155

AMBIENT TEMPERAT

URE (

°C)

Fig.1

Limiting element voltage

1.51(9.1

Ω)

F(

±1%)

J (

±5%)

0.15 to 9.1

(E24)

(E24)

(E24)

(E24)

±250

0.1 to 0.13

(E24)

400

±200

0.047 to 0.091 (E24)

500

±300

0.1 to 0.13

400

±200

0.15 to 0.91

±250

500

±300

0.047 to 0.091

Table 1

Resistance tolerance

Resistance range

(

Ω)

Special

specification

L

L

S

L

L

S

Resistance temperature coefficient

(ppm/

°C)

component in the mounted state. In addition, the reliability and performance of this component cannot be guaranteed if it is used with a steady state voltage that

is greater than its rated voltage.