MMF25SFRF18R Yageo, MMF25SFRF18R Datasheet - Page 5

• Manufacturer Part Number: MMF25SFRF18R
• Description: RES MELF MET 18 OHM 1/4W 1%
• Manufacturer: Yageo
• Series: MMFr

Specifications of MMF25SFRF18R

• Resistance (ohms): 18
• Power (watts): 0.25W, 1/4W
• Composition: Metal Film
• Temperature Coefficient: ±100ppm/°C
• Tolerance: ±1%
• Size / Dimension: 0.055" Dia x 0.138" L (1.40mm x 3.50mm)
• Lead Style: Surface Mount (SMD - SMT)
• Package / Case: MELF, 0204
• Resistance In Ohms: 18.0
• Case: MELF
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Height: -

6. DIMENSIONS
7. ENVIRONMENTAL CHARACTERISTICS
(1) Short Time Over Load Test
(2) Temperature Coefficient Test
MMF-12
MMF-25
MMF-50
At 2.5 times of the rated voltage. ( If the voltage exceeds the maximum load voltage, the maximum load
voltage will be used as the rated voltage ) applied for 5 seconds, the resistor should be free from defects
after the resistor is released from load for about 30 minutes
Short Time Overload Voltage =
The change of the resistance value should be within ± 0.25 % + 0.05Ω (for normal size )
The change of the resistance value should be within ± 0.50 % + 0.05Ω ( for miniature size )
Test of resistors above room temperature 100°C ± 2°C ( Testing Temperature 115°C to 130°C ) at the
constant temperature silicon plate for over 5 minutes. Then measure the resistance value.
The Temperature Coefficient is calculated by the following equation and its value should be within the
range of requested.
Normal
Re
sistor
R ＝ Resistance value under the testing temperature
R
t
t
o
0
＝ Resistance value at the room temperature
＝ The testing temperature
＝ Room temperature
MMF25S
MMF50S
STYLE
Temperatur
MMF1WS
Miniature
MMF204
MMF207
e
C
Coefficien
2
5 .
*
3.50 ± 0.2
5.90 ± 0.2
8.50 ± 0.2
Power Rati
L
L
Page-5
t
=
R
R
−
ng
R
0
×
0
D
×
Resistance
DIMENSION
1.40 ± 0.15
2.20 ± 0.1
3.20 ± 0.2
t
−
1
D
t
0
×
10
Value
6
Unit：mm
C (Min)
0.5
0.5
0.5