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2010 ROHM Co., Ltd. All rights reserved.

2010.07 - Rev.A

Fixed Thick Film Low Ohmic Chip Resistors For Current Detection

UCR03 (1608 size : 1 / 4W•1 / 5W)



Features

1) Superior rated power.

2) Stable, low resistance guaranteed regardless of the surrounding environment.

3) Thick film resistive elements were used to create this lineup of ultra-low resistance products ranging from 20m

 to 910m.

4) Chip resistors ideal for current detection.

5) ROHM resistors have approved ISO9001- / ISO/TS 16949- 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)

(0.02W

R

0.20W)

0.2W (1 / 5W)

(0.20W

R

0.91W)

−55°C to + 155°C

at 70

°C

Item

Conditions

Specifications

Rated power

Rated voltage

Operating temperature

Nominal resistance

See Table 1.

<

<

<

<

0

20

40

60

80

100

−55

0

70

100

155

AMBIENT TEMPERATURE (

°C)

Fig.1

The voltage rating is calculated by the following equation.

E= P

×R

Power must be derated according to the power derating curve in

Figure 1 when ambient temperature exceeds 70

°C.

I = P R

E: Rated voltage (V)

I : Rated current (A)

P: Rated power (W)

R: Nominal resistance (

Ω)

Table 1

Resistance tolerance

Special specification

Resistance range

(

Ω)

Resistance temperature

coefficient (ppm/

°C)

0 to 250

0 to 200

0 to 150

0.020 to 0.047 (E24)

0.051 to 0.091 (E24)

0.1 to 0.91(E24)

S

L

J (±5%)

F (±1%)



Before using components in circuits where they will be exposed to transients such as pulse loads (short–duration, high– level loads), be certain to evaluate the

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.