SMD Power Resistors
Type 3521 Series
Key Features
n 2 Watts at 70C
n Small Size to Power Ratio
n Supplied on Tape
n Available via Distribution
n Value Marked on Resistor
n 500 Volt Maximum Overload
n 250 Volt Working Voltage
n Low Profile
n Terminal Finish -
Matte Sn over Ni
n MSL Level 2
TEConnectivityispleasedtointroducethislowcosthighpowerdevice,suitableforauto
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
4000pieces.
Characteristics - Electrical
Power Rating: 2 Watts at 70C**
Max. RCWV*: 250V
Max. Overload Voltage: 500V
Resistance Tolerance(%): 1%
Resistance Range: 1R0 - 1M0
Temperature Coefficient: <10R = 200PPM
10R 1M0 = 100PPM
>1M0 = 200PPM
Operating Temperature: -55C 155C
* 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
60
40
20
0
0 20 40 60 70 80 100 120 140 155
Ambient Temperature (C)
For resistors operated in ambient temperatures above 70C,
power rating must be derated in accordance with this curve.
9-1773463-5 CIS WR 03/2012 Dimensions are in millimeters Dimensions are shown for For email, phone or live chat, go to: te.com/help
and inches unless otherwise reference purposes only.
specified. Values in brackets Specifications subject
are standard equivalents. to change.
Rated Power (%)SMD Power Resistors
Type 3521 Series
Dimensions
L
a
W
t
b
LW a b t
6.30 3.20 0.60 0.50 0.55
0.20 0.20 0.20 0.20 0.10
Marking
4 digit marking system. First three digits are significant figures of resistance, fourth denotes number of zeros eg.
3302 = 33K 33,000.
For values below 10 the letter R is used as decimal point eg. 1R20 = 1R2 = 1.2
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 1K0 FT
Common Part Resistance Value Tolerance Pack Style
1 ohm
1000 milli ohms
1R0
3521 1K ohm F - 1%
T - 4000 / reel
1000 ohms
1K0
1 Meg ohm
1000000 ohms
1M0
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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.