Power Metal Film Flame-Proof Resistors (FMF)

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Power Metal Film Flame-Proof Resistors (FMF)

DeMint Electronics is a global engineering electronics supplier for performance-critical applications, introducing the (FMF) series of Power Metal Film Flame-Proof Resistors. Offering a combination of high precision and handling high power conditions, this resistor is ideal for measuring power line voltage for power condition and energy metering monitoring.

DeMint (FMF) Flame-Proof Resistor is desogned to provide an alternative options between Power Metal Oxide Resistors (RSS, RSN) and Precision Metal-Film Resistors (MF). The (FMF) takes the power handling with flame-proof advantage of metal oxide resistors and inherits the precision tolerance of (MF) metal film resistors to provide a solution for customers looking for an industrial grade flame-proof resistors.

The power of Flame-Proof Resistor (FMF) is rated at 1/4, 1/2WS, 1/2W, 1W, 2WS, 2W, 3WS, 3W, 5WS, 5W, and 7WS respectively. Standard values from 0.1Ω to 10MΩ are available, E24, E-96, and E-192 nominal standard series provides adequate "‘close value match" choice for designers. Maximum overload voltage specifies up to 1000V at 5W normal size or 7WS minimum size.

The (FMF) resistors have excellent high power characteristics to improve reliability and reduce faults. With precision levels of ±0.1% resistance tolerance and ±15ppm/°C TCR they free up designers’ error budgets, enabling savings elsewhere in the circuit. Accuracy is ± 0.1%, ± 0.25%, ± 0.5%, ± 1%, ± 2%, and ± 5% precision tolerance, which saves the designer's error budget and free up other parts of the circuit.

Structurally the resistors include a homogeneous sputtered metal alloy film on a high-aluminum ceramic rod and protect with flame-proof coating. The resistance value in the film was adjusted to the final value by laser spiral cutting. The terminals on both ends of the resistor are covered with a pure tin coating to avoid aging the contacts and a low melting point solder can be used thereon.

Download Metal Film Non-Flammable Resistor (FMF) in PDF.

Features :

High power in small packages, Low electrical noise.
Outstanding stability under a wide range of electrical and environmental stresses.
Pure tin plating provides compatibility with lead (Pb)-free and lead containing soldering processes.
Compatible with “Restriction of the use of Hazardous Substances” (RoHS) directive 2011/65/EU.

Applications :

Ballasts, Amplifiers, Power Supplies, Telecommunications
Household Appliances, Automotive, Computer, Precision Controls
Test Equipment and Instrumentation, Medical Equipment, Security Monitoring

Specifications & Dimensions (Unit: mm) (FMF)

Specifications & Dimensions (Unit: mm) (FMF)

Style
FMF

Dimensions (Unit: mm)

Operating Temp. Range (℃)

Max Working Voltage (V)

Max Overload Voltage (V)

Normal

Mini

d ± 0.1

Normal

Mini

Normal

Mini

1/4W

1/2WS

6.3±0.5

2.3±0.3

28±2.0

0.55

-55 ~ +155

300

200

500

400

1/2W

1WS

9.0±1.0

3.2±0.5

26±3.0

0.65

350

250

600

500

2WS

11.5±1.0

4.5 ±0.5

33 ±3.0

0.78

350

300

700

600

3WS

15.5±1.0

5.0±0.5

32±3.0

0.78

350

700

5WS

17.5±1.0

6.5±0.5

35±3.0

0.78

500

350

1000

700

7WS

24.5±1.0

8.5±0.5

35±3.0

0.78

600

500

1000

800

Remark:
The maximum value of D.C. voltage or A.C. voltage (commercial frequency effective value) capable of being applied
continuously to resistors at the rated ambient temperature. Rated voltage shall be calculated from the following formula.
However, it shall not exceed the maximum working voltage.
Rated Voltage (RCWV) = √Rated Power (W) x Nominal Resistance Value (Ω)

Resistance & TCR Range (FMF)
Style		Tolerance(%)	TCR (ppm/℃)/ Ω
Normal	Mini	Tolerance(%)	±15	±25	±50	±100	±200
1/4W	1/2WS	±5%					0.1Ω~10MΩ
		±2%					0.1Ω~10MΩ
		±1%	10Ω~1MΩ	10Ω~10MΩ	10Ω~10M	0.1Ω~10MΩ	0.1Ω~10MΩ
		±0.5%	10Ω~1MΩ	10Ω~10MΩ	10Ω~10M	0.1Ω~10MΩ
		±0.25%	10Ω~1MΩ	10Ω~1MΩ	10Ω~1MΩ	0.1Ω~1MΩ
		±0.1%	10Ω~1MΩ	10Ω~1MΩ	10Ω~1MΩ
1/2W	1WS	±5%					0.1Ω~10MΩ
		±2%					0.1Ω~10MΩ
		±1%		10Ω~1MΩ	10Ω~10MΩ	0.1Ω~10MΩ	0.1Ω~10MΩ
		±0.5%		10Ω~1MΩ	10Ω~10MΩ	0.1Ω~10MΩ
		±0.25%		10Ω~1MΩ	10Ω~1MΩ	0.1Ω~1MΩ
		±0.1%		10Ω~1MΩ	10Ω~1MΩ
1W	2WS	±5%					0.1Ω~10M
		±2%					0.1Ω~10M
		±1%		10Ω~1MΩ	10Ω~10MΩ	0.1Ω~10MΩ	0.1Ω~10M
		±0.5%		10Ω~1MΩ	10Ω~10MΩ	0.1Ω~10MΩ
		±0.25%		10Ω~1MΩ	10Ω~1MΩ	0.1Ω~1MΩ
		±0.1%		10Ω~1MΩ	10Ω~1MΩ
2W	3WS	±5%					0.1Ω~10MΩ
		±2%					0.1Ω~10MΩ
		±1%		10Ω~1MΩ	10Ω~10MΩ	0.1Ω~10MΩ	0.1Ω~10MΩ
		±0.5%		10Ω~1MΩ	10Ω~10MΩ	0.1Ω~10MΩ
		±0.25%		10Ω~1MΩ	10Ω~1MΩ	0.1Ω~1MΩ
		±0.1%		10Ω~1MΩ	10Ω~1MΩ
3W	5WS	±5%					0.1Ω~10MΩ
		±2%					0.1Ω~10MΩ
		±1%				0.1Ω~100KΩ	0.1Ω~10MΩ
		±0.5%				10Ω~100KΩ
5W	7WS	±5%					0.1Ω~100KΩ
		±2%					0.1Ω~100KΩ
		±1%				0.1Ω~100KΩ	0.1Ω~100KΩ
		±0.5%				10Ω~100KΩ
* Resistance standard decade values E-24, E-96, E-192.

FMF

1/2W

100R

T52

Part Number

FMF

Rated Power (W)

1/4W

1/2WS

1/2W

2WS

3WS

5WS

7WS

Resistance Value (Ω)
10R	10Ω
100R	100Ω
1K	1KΩ
10K	10KΩ

Resistance Tolerance (%)
J	±5%
G	±2%
F	±1%
D	±0.5%
C	±0.25%
B	±0.1%

TCR(ppm/℃)
	±200ppm/℃
C1:	±100ppm/℃
C2:	±50ppm/℃
C3:	±25ppm/℃
C5:	±15ppm/℃

Package
T52	Taping 52mm/Box.
T73	Taping 73mm/Box.
T88	Taping 88mm/Box.

Electrical Performance (FMF)
Test Characteristics	Test Methods	Performance Requirement
Resistance	Measuring points at 10mm±1mm from the end cap.	Within regulated tolerance
T.C.R.	Room temperature /100°C up.	± 15, ± 25, ± 50, ± 100,± 200ppm/℃
Short Time Overload	Rated voltageX2.5 or Max. overload voltage for 5s whichever less.	±(2%+0.1Ω)
Solderability	260°C±5°C, 2s±0.5s	90% Coverage Min.
Terminal strength	DeMint load: 25N, 10s Twist test:360°, 5 times Bending test:5N, 90°, 2 times	No mechanical damages
Moisture resistance	40°C±2°C, 90%~95%RH, 1000Hrs, 1.5Hrs on/0.5Hr off cycle	±(5%+0.1Ω)
Load Life	70°C±2°C, 1000Hrs, 1.5Hr on/0.5Hr off cycle.	±(5%+0.1Ω)

Power Metal Film Flame-Proof Resistors (FMF)

Specifications & Dimensions (Unit: mm) (FMF)

Flame-Proof Resistor (FMF) Hot-Spot Temperature

Non-flammable Resistor (FMF) Derating Curve