TOKEN
RFM High Frequency MELF Resistors
High Frequency
Non-Inductance
Melf Resistors
Non-Inductance MELF Offer Greater Choice
for High Frequency Applications
Preview
The RFM speciality series of high frequency non-inductance MELF resistor from Token Electronics has
been extended to offer more than GHz operation, making the devices more suitable for high frequency RF
applications.
They are the perfect choice in high frequency circuit designs where the parasitic inductance of regular, helical
trimmed resistors can not be accepted, but where also pulse energies apply. Typical applications are in the fields
of telecommunication equipment and industrial electronics.
These high stability, non-inductance MELF resistors have a footprint very close to comparable chip resistors
but maintain their tolerance and deliver higher stability over a wider temperature range. Sizes range from 5.7 x
2.1mm for the RFM74 MELF-0207, through 3.45 x 1.3mm for the RFM73 MELF-0204 down to 2.2 x 1.3mm for
the RFM72 MELF-0102.
Production is strictly controlled and follows and extensive set of instructions established for reproducibility.
The groove on the metal alloy film of high grade ceramic rod is special designed to achieve non inductance. The
resistor elements are covered by a protective coating designed for mechanical, electrical and climatic protection.
The terminations are covered with a final pure tin plating for keeping perfect solderability. Four or five color
code rings designate the resistance value and tolerance in accordance with IEC 60062.
Token’s RFM MELF standard series can be a replacement for Vishay, IRC, EBG, KAO, Panasonic Precision
Devices with more competitive price and short lead time. Contact us with your specific needs.
Features
- Lead (Pb)-free and RoHS compliant.
- Ower dissipation rating at 70°C up to 0.75W.
- Low-inductance non-helical trimmed product.
- Special metal film technology, DIN: 0102, 0204, 0207.
- Tolerance range: ±0.5% to ±5.0%; Resistance range: 25Ω to 200Ω.
- Suitable for more than GHz operation; Excellent overall stability:
Class 0.5.
Applications :
- Medical Equipment.
- Industrial electronics.
- Automatic Equipment Controller.
- Communication Device, Cell phone, GPS, PDA.
Version 2010
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- HF and pulse loading applications.
- Testing & Measurement Equipment.
- Consumer Product, Printer Equipment.
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RFM High Frequency MELF Resistors
Dimensions & Recommended Soldering Bath Dimensions
W
S
D1
L1
Type
Metric sizes
L±0.2
L1±0.2
D±0.2
K±0.1
D1±0.1
S
W
H
K
RFM72
DIN: 0102
2.2
1.2
1.3
0.4
D+0/D-0.15
1.0
2.0
2.0
RFM73
DIN: 0204
3.45
1.6
1.3
0.8 min
D+0/D-0.25
1.6
2.0
2.5
H
Dimension (mm)
Soldering bath
(recommended)
(mm)
RFM74
DIN: 0207
5.7
3.0
2.1
1.2 min
D+0/D-0.3
2.6
2.5
2.5
RFM75
DIN: 0207
6.0
3.3
2.1
1.2 min
D+0/D-0.3
2.8
2.5
2.5
Characteristics
Type
Metric sizes
Resistance range
Operating Temperature range
Resistance Tolerance (%)
Temperature coefficient (PPM/°C)
Rated dissipation (W) P
70
Operating mode
Climatic category (LCT/UCT/days)
Endurance,
Max, resistance change at P70,
ΔR/R max., after 1000h
Derating
Insulation voltage
Insulation resistance
RFM72
DIN: 0102
RFM73
RFM74
DIN: 0204
DIN: 0207
25Ω ~ 200Ω
-55°C ~ 125°C
D(±0.5); F(±1.0); J(±5.0)
C2(±50); C3(±25); C5(±15); C6(±10)
0.25
0.5
standard
standard
55/125/56
55/155/56
≤0.5% for Tol.=±1% & ≤1% for Tol.=±5%
standard type linear from 70°C to 125°C
500V
>1GΩ
RFM75
DIN: 0207
0.125
standard
55/125/56
0.75
power
55/155/56
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Version 2010
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