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Page <1> V1.015/09/14
Thick Film Chip Resistors
Features:
• High reliability and stability
• Reduced size of nal equipment
• Lower assembly costs
• Higher component and equipment reliability
Application:
• Consumer electrical equipment
• EDP, Computer application
• Telecom application
Description:
The resistors are constructed in a high grade ceramic body (aluminum oxide).
Internal metal electrodes are added at each end and connected by a resistive paste
that is applied to the top surface of the substrate. The composition of the paste is
adjusted to give the approximate resistance required and the value is trimmed to
within tolerance by laser cutting of this resistive layer.
The resistive layer is covered with a protective coat. Finally, the two external
end terminations are added. For ease of soldering the outer layer of these end
terminations is a Tin (lead free) alloy.
Item General Specication
Series No. MCWR12 MCWR08 MCWR06 MCWR04
Size code 1206(3216) 0805(2012) 0603(1608) 0402(1005)
Resistance Range 1Ω to10MΩ 1% tolerance
Resistance Tolerance 1%
E96/E24
TCR (ppm/°C)
10MΩ ≥R >10
R≤10Ω
≤ ± 100
-200 to +400
Max. dissipation
@ Tamb=70°C 1/4 W 1/8 W 1/10 W 1/16 W
Max. Operation
Voltage (DC or RMS) 200V 150V 50V 50V
Max. Overload
Voltage (DC or RMS) 400V 300V 100V 100V
Climatic category 55/155/56
Quick Reference Data
Note :
1. Max. Operation Voltage : So called RCWV (Rated Continuous Working Voltage) is determined by
RCWV = Rated Power × Resistance Value or Max. RCWV listed above, whichever is lower.
2. The resistance of Jumper is dened <0.05Ω.
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Page <2> V1.015/09/14
Thick Film Chip Resistors
MCWR12 MCWR08 MCWR06 MCWR04
L3.1 ± 0.1 2 ± 0.1 1.6 ± 0.1 1 ± 0.05
W1.6 ± 0.1 1.25 ± 0.1 0.8 ± 0.1 0.50 ± 0.05
T0.6 ± 0.15 0.5 ± 0.15 0.45 ± 0.15 0.35 ± 0.05
Tb 0.45 ± 0.2 0.4 ± 0.2 0.3 ± 0.15 0.25 ± 0.1
Tt 0.5 ± 0.2 0.4 ± 0.2 0.3 ± 0.1 0.2 ± 0.1
Dimensions : Millimetres
Mounting
Due to their rectangular shapes and small tolerances, Surface Mountable Resistors are suitable for handling by automatic
placement systems.
Chip placement can be on ceramic substrates and printed-circuit boards (PCBs).
Electrical connection to the circuit is by individual soldering condition.
The end terminations guarantee a reliable contact.
Functional Description:
Product characterization
Standard values of nominal resistance is E96 series for resistors with a tolerance of ±1%.
Derating
The power that the resistor can dissipate depends on the operating temperature; see Fig.2
Figure 2 Maximum dissipation in percentage of rated power as
a function of the ambient temperature for MCWR12,
MCWR08, MCWR06, MCWR04
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Page <3> V1.015/09/14
Thick Film Chip Resistors
MCWR12 X 472_ J T L
Size code
MCWR12 : 1206
MCWR08 : 0805
MCWR06 : 0603
MCWR04: 0402
Type code
X :
±1%, 10Ω to 1MΩ
W :
±1%, < 10Ω; >1MΩ
Resistance code
4.7Ω =4R7_
10Ω =100_
220Ω =221_
Jumper =000_
("_" means a blank)
±1%, E24+E96: 3 signicant
digits followed by no. of
zeros
102Ω =1020
37.4KΩ =3742
Tolerance
F : ±1%
P : Jumper
Packaging code
T : 7" Reeled taping
Q : 10" Reeled taping
G : 13" Reeled taping
H : 13" reel 50Kpcs
only for 0402
B : Bulk
D : 7" reel 20Kpcs
only for 0402
A : 7" reel 15Kpcs
only for 0402
Termination
code
L = Sn base
(lead free)
Catalogue Numbers:
The resistors have a catalogue number starting with
MCWR12, MCWR08, MCWR06:
1. Reeled tape packaging : 8mm width paper taping 5,000pcs per 7" reel, 10kpcs per 10" reel, 20kpcs per 13" reel.
2. Bulk packaging : 5,000pcs per poly-bag
MCWR04:
1. Reeled tape packaging : 8mm width paper taping 10,000pcs per 7" reel, 20,000pcs per 10" reel. 70,000pcs per 13" reel.
2. Bulk packaging : 10,000pcs per poly-bag
Soldering Condition:
The robust construction of chip resistors allows them to be completely immersed in a solder bath of 260°C for 10 seconds.
Therefore, it is possible to mount Surface Mount Resistors on one side of a PCB and other discrete components on the
reverse (mixed PCBs).
Surface Mount Resistors are tested for solderability at 235°C during 2 seconds. The test condition for no leaching is 260°C for
30 seconds. Typical examples of soldering processes that provide reliable joints without any damage are given in Fig 3.
Fig 3. Infrared soldering prole for Chip Resistors
For SnAgCu series solder pase
480 Sec max to Peak
60–120 Sec 60–150 Sec
30 sec min Time
260
245
217
150
200
25
Temp. (DegC)
max. ramp up rate = 3°C/s
max. ramp down rate = 6°C/s
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Thick Film Chip Resistors
Test and Requirements:
Essentially all tests are carried out according to the schedule of IEC publication 115-8, category LCT/UCT/56 (rated
temperature range : Lower Category Temperature, Upper Category Temperature; damp heat, long term, 56 days). The testing
also meets the requirements specied by EIA, EIAJ and JIS.
The tests are carried out in accordance with IEC publication 68, "Recommended basic climatic and mechanical robustness
testing procedure for electronic components" and under standard atmospheric conditions according to IEC 60068-1,
subclause 5.3. Unless otherwise specied, the following value supplied :
Temperature: 15°C to 35°C.
Relative humidity: 45% to 75%.
Air pressure: 86kPa to 106 kPa (860 mbar to 1060 mbar).
All soldering tests are performed with midly activated ux.
Test Procedure / Test Method
Requirement
Resistor 0Ω
Electrical
Characteristics
JISC5201-1: 1998
Clause 4.8
- DC resistance values measurement
- Temperature Coefcient of Resistance (T.C.R)
Natural resistance change per change in degree centigrade.
R1 : Resistance at reference temperature (20°C +5°C / -1 °C)
R2 : Resistance at test temperature (-55°C or +155°C)
Within the specied
tolerance Refer to
"QUICK REFERENCE
DATA"
<50mΩ
Resistance to
soldering heat(R.S.H)
JISC5201-1:1998
Clause 4.18
Un-mounted chips completely immersed for 10 ±1second in a
SAC solder bath at 260°C ±5°C
±1%: ∆R/Rmax.
±(0.5%+0.05Ω )
no visible damage
<50mΩ
Solderability
JISC5201-1: 1998
Clause 4.17
Un-mounted chips completely immersed for 10 ±1second in a
SAC
solder bath at 235°C ±5°C
95% coverage min., good
tinning and no visible damage
Temperature cycling
JISC5201-1: 1998
Clause 4.19
30 minutes at -55°C ±3°C, 2-3 minutes at 20°C +5°C -1°C,
30 minutes at
+155°C ±3°C, 2-3 minutes at 20°C +5°C -1°C, total 5 continuous
cycles
±1%: ∆R/Rmax.
±(0.5%+0.05Ω)
No visible damage
<50mΩ
High Temperature
Exposure
MIL-STD-202
method 108
1,000 +48/-0 hours; without load in a temperature chamber
controlled 155 ±3°C
±1%:∆R/
Rmax.±(1%+0.1Ω)
No visible damage
<50mΩ
Bending strength
JISC5201-1: 1998
Clause 4.33
Resistors mounted on a 90mm glass epoxy resin PCB(FR4),
bending once 3mm for 10sec, 5mm for MCWR04
±1%:∆R/
Rmax.±(1%+0.05Ω)
No visual damaged
<50mΩ
Adhesion
JISC5201-1: 1998
Clause 4.32
Pressurizing force: 5N, Test time:
10
±
1sec.
No remarkable damage or
removal of the terminations
Short Time Overload
(STOL)
JISC5201-1: 1998
Clause 4.13
2.5 times RCWV or max. overload voltage, for 5seconds
±1%: ∆R/R max.
±(1%+0.05Ω)
No visible damage
<50mΩ
t1 : 20°C+5°C/-1 °C; t2 : -55°C or +155°C
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Page <5> V1.015/09/14
Thick Film Chip Resistors
Test Condition For Jumper (0 Ω)
Item MCWR12 MCWR08 MCWR06 MCWR04
Power Rating At 70°C 1/4W 1/8W 1/10W 1/16W
Resistance MAX. 50mΩ
Rated Current 2A 1.5A 1A 1A
Peak Current 5A 3.5A 3A 2A
Operating Temperature -55°C to +155° C
Test Procedure / Test Method
Requirement
Resistor 0Ω
Load life in Humidity
JISC5201-1: 1998
Clause 4.24
1000 +48/-0 hours, loaded with RCWV or Vmax in humidity
chamber controller at 40°C± 2°C and 90 to 95% relative humidity,
1.5hours on and 0.5 hours off
±1%: ∆R/R max.
±(1%+0.1Ω)
No visible damage
<50mΩ
Load life (endurance)
JISC5201-1: 1998
Clause 4.25
1000 +48/-0 hours, loaded with RCWV or Vmax in chamber
controller 70±2ºC, 1.5 hours on and 0.5 hours off
±1%: ∆R/R max.
±(1%+0.1Ω)
No visible damage
<50mΩ
Insulation Resistance
JISC5201-1: 1998
Clause 4.6
Apply the maximum overload voltage (DC) for 1minute R10GΩ
Dielectric Withstand
Voltage
JISC5201-1: 1998
Clause 4.7
Apply the maximum overload voltage (AC) for 1 minute No breakdown or ashover
Dimensions : Millimetres
Packaging:
Paper Tape specications
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Page <6> V1.015/09/14
Thick Film Chip Resistors
Series No. A B W F E
MCWR12 3.6 ±0.2 2 ±0.2
8 ±0.3 3.5 ±0.2 1.75 ±0.1
MCWR08 2.4 ±0.2 1.65 ±0.2
MCWR06 1.9 ±0.2 1.1 ±0.2
MCWR04 1.2 ±0.1 0.7 ±0.1
Series No. P1 P0 D
T
MCWR12/WR08
4 ±0.1
4 ±0.1 Φ1.5 +0.1
-0.0
Max. 1
MCWR06 0.65 ±0.05
MCWR04 2 ±0.1 0.4 ±0.05
7" Reel dimensions:
Important Notice : This data sheet and its contents (the “Information”) belong to the members of the Premier Farnell group of companies (the “Group”) or are licensed to it. No licence is granted
for the use of it other than for information purposes in connection with the products to which it relates. No licence of any intellectual property rights is granted. The Information is subject to change
without notice and replaces all data sheets previously supplied. The Information supplied is believed to be accurate but the Group assumes no responsibility for its accuracy or completeness, any
error in or omission from it or for any use made of it. Users of this data sheet should check for themselves the Information and the suitability of the products for their purpose and not make any
assumptions based on information included or omitted. Liability for loss or damage resulting from any reliance on the Information or use of it (including liability resulting from negligence or where the
Group was aware of the possibility of such loss or damage arising) is excluded. This will not operate to limit or restrict the Group’s liability for death or personal injury resulting from its negligence.
Multicomp is the registered trademark of the Group. © Premier Farnell plc 2012.
Symbol A B
C D
7" reel Φ178 ±2 Φ60 ±1 13 ±0.2 9 ±0.5
10" reel Φ254 ±2 Φ100 ±1 13 ±0.2 9 ±0.5
13" reel Φ330 ±2 Φ100 ±1 13 ±0.2 9 ±0.5
