MELF RESISTORS
Website: www.royalohm.com
Email: info@royalohm.com (Thailand 泰國ประเทศไทย)
info-sz@royalohm.com.cn (China Shenzhen 中國深圳 ประเทศจีน เซินเจิ้น)
• Resistors shall have a power rating based on continuous full
load operation at an ambient temperature of 70 ํc
•For temperature in excess of 70 ℃, the load shall be derated
•Resistors shall have a rated direct-current (DC) continuous
working voltage
•an approximate sine-wave root-mean-square (RMS) alternating-
current (AC) continuous working voltage at commercial-line
frequency and waveform curresponding to the power rating
11
1
Product Type: Resistance Value:
MC24 = MELF Carbon Film type 0204 E-24 series: the 1st digit is"0",
MC27 = MELF Carbon Film type 0207 the 2nd & 3r
d
di
g
its are for
the significant figures of the
resistance and the 4th indicate
Wattage: the number of zeros following:
Normal size: Small size: "J" ~ 0.1, "K" ~ 0.01
W8 = 1/8W S4 = 1/4W-S Ex.: 4.7Ω ~ 47J, 4.7KΩ ~ 472
W4 = 1/4W S2 = 1/2W-S
Packing Type:
Tolerance: T = Tape/Reel
G = ± 2%
J = ± 5% Packing Quantity:
2 = 2,000pcs
3 = 3,000pcs
Sample: B = 2,500pcs
MELF Carbon Film type 0204 1/4W-S +/- 5% 100Ω Tape/Reel 3,000 → MC24S4J0101T30
MELF Carbon Film type 0207 1/4W +/- 5% 100Ω Tape/Reel 2,000 → MC27W4J0101T20 Addition Information:
MELF Carbon Film type 0207 1/2W-S +/- 5% 100Ω Tape/Reel 2,000 → MC27S2J0101T20 0 = NIL
Ratings:
1 Power rating:
Resistors shall have a power rating based on continuous full load operation at an
ambient temperature of 70 ℃. For temperature in excess of 70 ℃ , the load shall be
derated as shown in the figure 1.
2 Voltage rating:
Resistors shall have a rated direct-current (DC) continuous working voltage or
an approximatesine-wave root-mean-square (RMS) alternating-current (AC) continuous working
voltage at commercial-line frequency and waveform curresponding to the power rating ,
as determined from the following formula :
RCWV = √P x R
Were : RCWV = Rated DC or RMS AC continuous working voltage at commercial-line frequency and
waveform (volt)
13
2
8
J201S00T
1210
Part Number System
Explanation of Part Number System
(MELF Carbon Film Resistors)
35796414
7M
1C
22
Temperature Range -55℃～ +155℃
Ambient Temperature 70 ℃
600 V
Max. Working Voltage 250 V 300 V 300 V
Max. Overload Voltage 500 V 600 V
MECF 0207 MECF 0207
Power Rating 0.25W (1/4W-S) 0.25W (1/4W) 0.50W (1/2W-S)
Type MECF 0204
P = Power Rating (watt)
R = Nominal Resistance (ohm)
In no case shall the rated DC or RMS AC continuous working voltage be greater
than the applicable maximum value.
Figure 1.
Construction :
No.
1 Basic Body Rod Type Ceramics
2 Resistance Film Carbon Film
3 End Cap Steel (Tin plated iron surface)
4 Coating Insulated resin ( Color : Ivory )
5 Color Code Epoxy Resin
Power rating and dimensions
Dimension :
Power Rating :
Resistance Range
1Ω ~ 1MΩ
Power Rating at 70 ℃
0.25W(1/4W)
0.50W(1/2W-S)
± 5
± 5
± 5
Tolerance %
1Ω ~ 1MΩ
1Ω ~ 1MΩ
MECF 0207
MECF 0207
2.40.25WMECF 0207 2.2±0.1
MECF 0207
Type
MECF 0204 0.25W(1/4W-S)
Dimension (mm)
Type C Min D2 MaxD1L
Power
Ratin
g
D3 Max
0.5
2.10.5W 0.5 2.42.2±0.15.9±0.2
2.15.9±0.2
MECF 0204 1.251.551.40±0.150.53.5±0.20.25W
Name Material
11
0
Product Type: Resistance Value:
M24 = MELF Metal Film E-24 series: the 1st digit is"0",
type 0204 the 2n
d
& 3r
d
di
g
its are for
M27 = MELF Metal Filmx the significant figures of the
type 0204 resistance and the 4th indicate
the number of zeros following:
"J" ~ 0.1, "K" ~ 0.01
Wattage: Ex.: 4.7Ω ~ 47J, 4.7KΩ ~ 472
Normal size: Small size: E--96 Series: the 1st to 3rd digits
W8 = 1/8W S4 = 1/4W-S are significant figures of
W4 = 1/4W S2 = 1/2W-S resistance and the fourth
one denotes number of zeros
Tolerance: following:
B = ± 0.1% D = ± 0.5% G = ± 2% Ex.: 1.33KΩ = 1331
C = ± 0.25% F = ± 1% J = ± 5%
PPM requirement: Packing Type:
A = ± 10PPM F = ± 50PPM T = Tape/Reel
B = ± 15PPM G = ± 100PPM
C = ± 25PPM J = ± 200PPM Packing Quantity:
2 = 2,000pcs
3 = 3,000pcs
Sample: B = 2,500pcs
MELF Metal Film type 0204 1/4W-S +/- 1% 50PPM 100Ω Tape/Reel 3,000 → M24S4FF1000T30
MELF Metal Film type 0207 1/4W +/- 1% 50PPM 100Ω Tape/Reel 2,000 → M27W4FF1000T20 Addition Information:
MELF Metal Film type 0207 1/2W-S +/- 1% 50PPM 100Ω Tape/Reel 2,000 → M27S2FF1000T20 0 = NIL
Ratings:
1 Power rating:
Resistors shall have a power rating based on continuous full load operation at an
ambient temperature of 70 ℃. For temperature in excess of 70 ℃ , the load shall be
derated as shown in the figure 1.
Temperature Range -55℃～ +155℃
Ambient Temperature 70 ℃
Max. Overload Voltage 400 V 500 V 500 V
Max. Working Voltage 200 V 250 V 250 V
MEMF 0207 MEMF 0207
Power Rating 0.25W (1/4W-S) 0.25W (1/4W) 0.50W (1/2W-S)
Type MEMF 0204
0
Part Number System
Explanation of Part Number System
(MELF Metal Film Resistors)
23 7 10 14
W27M
1946 85
0
13
F
41F
12
T20
2 Voltage rating:
Resistors shall have a rated direct-current (DC) continuous working voltage or an approximate
sine-wave root-mean-square (RMS) alternating-current (AC) continuous working voltage at commercial-
line frequency and waveform curresponding to the power rating , as determined from the
following formula :
RCWV = √P x R
Were : RCWV = Rated DC or RMS AC continuous working voltage at commercial-line frequency and
waveform (volt)
P = Power Rating (watt)
R = Nominal Resistance (ohm)
In no case shall the rated DC or RMS AC continuous working voltage be greater
than the applicable maximum value.
Figure 1.
Construction :
No.
1 Basic Body Rod Type Ceramics
2 Resistance Fil
m
Metal Film
3 End Cap Steel (Tin plated iron surface)
4 Coating Insulated epoxy resin ( Color : Blue )
5 Color Code Epoxy Resin
Name Material
Power rating and dimensions
Dimension :
Power Rating at 70 ℃
Power Rating :
Type Tolerance % Resistance Range
MEMF 0204
MEMF 0207
MEMF 0207
0.25W(1/4W-S)
0.25W(1/4W)
0.50W(1/2W-S)
± 5
± 5
± 5
10Ω ~ 1MΩ
10Ω ~ 1MΩ
10Ω ~ 1MΩ
D3 Max
Power
Ratin
g
L D1 D2 MaxC Min
Dimension (mm)
Type
MEMF 0204 1.251.551.40±0.150.53.5±0.20.25W
2.1
2.1
MEMF 0207
MEMF 0207
0.5W
0.25W
0.5 2.4
2.4
2.2±0.1
2.2±0.10.5
5.9±0.2
5.9±0.2
