SMD Power Resistors
Type 3521 Series
Key Features
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2 Watts at 70°C
Small Size to Power Ratio
Supplied on Tape
Available via Distribution
Value Marked on Resistor
500 Volt Maximum Overload
250 Volt Working Voltage
Low Profile
Terminal Finish -
Matte Sn over Ni
MSL Level 2
TE Connectivity is pleased to introduce this low cost high power device, suitable for auto
placement in volume, and for most applications, including high frequency operations,
owing to the short lead structure. It is attractively priced and available on 7" reels of
4000 pieces.
Characteristics - Electrical
Power Rating:
Max. RCWV*:
Max. Overload Voltage:
Resistance Tolerance(%):
Resistance Range:
Temperature Coefficient:
2 Watts at 70°C**
250V
500V
± 1%
1R0 - 1M0
<10R = ± 200PPM
10R – 1M0 = ± 100PPM
>1M0 = ± 200PPM
-55°C – 155°C
Operating Temperature:
* Rated continuous working voltage (RCWV) shall be determined from
RCWV = Rated Power x Resistance Value, or Maximum RCWV listed above, whichever is less
** Recommended Circuit Board Design - If this device is anticipated to run at full continuous power then action
to improve the cooling should be taken. This can be a metal substrate, copper pad left under the chip, an
opening in the PCB or enlarged silver conductor pads each end.
Power Derating Curve
100
80
Rated Power (%)
60
40
20
0
0
20
40
60 70 80
100
120
140
155
Ambient Temperature (°C)
For resistors operated in ambient temperatures above 70°C,
power rating must be derated in accordance with this curve.
9-1773463-5 CIS WR 03/2012
Dimensions are in millimeters
and inches unless otherwise
specified. Values in brackets
are standard equivalents.
Dimensions are shown for
reference purposes only.
Specifications subject
to change.
For email, phone or live chat, go to:
te.com/help
SMD Power Resistors
Type 3521 Series
Dimensions
a
L
W
t
b
L
6.30
±0.20
W
3.20
±0.20
a
0.60
±0.20
b
0.50
±0.20
t
0.55
±0.10
Marking
4 digit marking system. First three digits are significant figures of resistance, fourth denotes number of zeros eg.
3302 = 33K – 33,000Ω.
For values below 10Ω the letter R is used as decimal point eg. 1R20 = 1R2 = 1.2Ω
Handling Recommendations
When flow soldering - the land width must be smaller than the Chip Resistor width to properly control the solder
application. Generally, the land width can be Chip Resistor width (W) x 0.7 to 0.8. When reflow soldering - solder
application amount can be adjusted. Thus the land width can be set to W x 1.0 to 1.3.
How to Order
3521
Common Part
1K0
Resistance Value
1 ohm
1000 milli ohms
1R0
3521
1K ohm
1000 ohms
1K0
1 Meg ohm
1000000 ohms
1M0
F - 1%
T - 4000 / reel
F
Tolerance
T
Pack Style
TE Connectivity, TE connectivity (logo) and TE (logo) are trademarks.
Other logos, product and Company names mentioned herein may be trademarks of their respective owners.
While TE has made every reasonable effort to ensure the accuracy of the information in this datasheet, TE does not guarantee that it is error-free, nor does TE make any other
representation, warranty or guarantee that the information is accurate, correct, reliable or current. TE reserves the right to make any adjustments to the information contained herein
at any time without notice. TE expressly disclaims all implied warranties regarding the information contained herein, including, but not limited to, any implied warranties of merchantabili-
ty or fitness for a particular purpose. The dimensions in this datasheet are for reference purposes only and are subject to change without notice. Specifications are subject to change
without notice. Consult TE for the latest dimensions and design specifications.
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