*RoHS Directive 2002/95/EC Jan. 27, 2003 including
annex and RoHS Recast 2011/65/EU June 8, 2011.
Specifications are subject to change without notice.
Users should verify actual device performance in their
specific applications.
The products described herein and this document are
subject to specific legal disclaimers as set forth on the
last page of this document, and at www.bourns.com/
docs/legal/disclaimer.pdf.
PWR221T-50 Series Power Resistor
Product Dimensions
3.18 ± 0.1
(.125 ± .004)
DIA.
10.41 ± 0.25
(.410 ± .010)
C
L
3.18 ± 0.25
(.125 ± .010)
1.38 ± 0.25
(.054 ± .010)
8.38 ± 0.25
(.330 ± .010)
CERAMIC
2.92 ± 0.25
(.115 ± .010)
CERAMIC
3.18 ± 0.25
(.125 ± .010)
16.26 ± 0.25
(.640 ± .010)
15.62 ± 0.25
(.615 ± .010)
REFERENCE
BOARD
SURFACE
LC
9.14 ± 0.25
(.360 ± .010)
CERAMIC
12.7 ± 1.27
(.500 ± .050)
2.54 ± 0.25
(.100 ± .010)
1.02 ± 0.25
(.040 ± .010)
CERAMIC
5.08 ± 0.25
(.200 ± .010)
0.72 ± 0.12
(.029 ± .005)
DIMENSIONS:
1.03 ± 0.25
(.041 ± .010)
MM
(INCHES)
0.38
TOLERANCE: ±
UNLESS OTHERWISE NOTED
(0.015)
Pulse Power Rating
100
How to Order
PWR 221 T - 50 - 10R0 F
Model
PWR = Power
Resistor
10
Package
221 = TO-220 Style
Pin Style
T = Through-hole
Energy in Joules
1
Power
50 = 50 W
0.1
0.01
10 -6
10 -5
10 - 4
10 - 3
10 - 2
Overload Duration in Seconds
The energy absorbed by the resistor expressed in Joules can be calculated by
multiplying the peak power of the pulse in watts times the length of the pulse in
seconds.
The energy should not exceed the limits shown in the graph. The overload voltage
should not exceed 1.5 times the maximum operating voltage.
Absolute Tolerance
J=5%
F = 1 %
(Available for most values.
Resistance Value
<100 ohms ... “R” represents decimal
point (examples: 7R50 =
7.5
Ω;
R500 = 0.5
Ω)
≥100
ohms.... First three digits are
significant, fourth digit
represents number of
zeros to follow (exam-
ples: 2000 = 200 ohms;
3002 = 30K ohms)
Check Popular Resistance
Values table.
Specifications are subject to change without notice.
Users should verify actual device performance in their specific applications.
The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf.
PWR221T-50 Series Power Resistor
Derating Curve
120
100
Power Ratio (%)
80
60
40
20
0
0
10
20
30
40
50
60
70
80
90
100 110 120
130
140 150 160
Case Temperature (°C)
Asia-Pacific:
Tel: +886-2 2562-4117 • Email: asiacus@bourns.com
EMEA:
Tel: +36 88 520 390 • Email: eurocus@bourns.com
The Americas:
Tel: +1-951 781-5500 • Email: americus@bourns.com
www.bourns.com
12/18
Specifications are subject to change without notice.
Users should verify actual device performance in their specific applications.
The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf.
Legal Disclaimer Notice
This legal disclaimer applies to purchasers and users of Bourns
®
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Unless otherwise expressly indicated in writing, Bourns
®
products and data sheets relating thereto are subject to change
and complete before placing orders for Bourns
®
products.
The characteristics and parameters of a Bourns
®
product set forth in its data sheet are based on laboratory conditions, and
statements regarding the suitability of products for certain types of applications are based on Bourns’ knowledge of typical
requirements in generic applications. The characteristics and parameters of a Bourns
®
®
product with other components
the actual performance of the Bourns
®
®
®
product as meeting the requirements of a particular industry
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of Bourns
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products are responsible for ensuring compliance with safety-related requirements and standards applicable to
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Bourns
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