SRP1055 Series - Shielded Power Inductors
*RoHS Directive 2002/95/EC Jan 27, 2003 including Annex.
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
Inductance vs. DC Superposition Characteristics
10.0
6.0
8.0
4.0
2.0
0 2.5 5
DC Current (A)
Inductance (µH)
7.5 10
8R8
7R2
5R7
4R3
3R2
3.0
2.0
1.0
0.0
01020
DC Current (A)
Inductance (µH)
30 40
2R2
1R4
R80
R36
Features
■Shielded construction
■Unit height of 5.5 mm
■Inductance range: 0.36 µH to 8.8 µH
■Current up to 28 A
■RoHS compliant*
Applications
■Input/output of DC/DC converters
■Power supplies for:
•Portable communications equipment
•Camcorders
•LCD TVs
•Car audio systems
Electrical Specifications
Product Dimensions
1R4
9.35 ± 0.30
(0.368 ± 0.012)
1.4
(0.055)
10.0
(0.394)
1.00
(0.039)
2.8
(0.110)
2.0
(0.079)
2.0
(0.079)
3.0
(0.118)
3.0
(0.118)
3.0
(0.118)
3.0
(0.118)
1.50
(0.059)
2.10
(0.083)
6.0
(0.236)
6.0
(0.236)
11.00 ± 0.30
(0.422 ± 0.012)
TYP.
TYP.
TYP.
TYP.
TYP.
5.8
(.228)
5.50 ± 0.30
(0.216 ± 0.012)
General Specifications
Test Voltage........................................1 V
Test Frequency ..........................100 KHz
Reflow Soldering.....230 ˚C; 50 sec max.
Operating Temperature ..-55 °C to +150 °C
(Temperature rise included)
Storage Temperature..-55 °C to +150 °C
Resistance to Soldering Heat
..............................+260 °C for 10 sec.
Materials
Core.........................................Ferrite ER
Wire .............................Enameled copper
Terminal.....................................Cu/Ni/Sn
Rated Current.......Ind. drops 25 % at I sat
Temperature Rise..........40 ˚C at rated I rms
Packaging .......300 pcs. per 13-inch reel
Recommended Layout
Electrical Schematic
Inductance I rms I sat DCR
Bourns Part No. L (µH) (A) (A) (mΩ) max.
SRP1055-R36Y 0.36 ± 30 % 28.0 26.0 1.7
SRP1055-R80M 0.80 ± 20 % 20.0 18.0 2.5
SRP1055-1R4M 1.40 ± 20 % 16.0 14.0 3.2
SRP1055-2R2M 2.20 ± 20 % 12.0 10.0 5.8
SRP1055-3R2M 3.20 ± 20 % 11.0 9.0 7.2
SRP1055-4R3M 4.30 ± 20 % 10.0 8.0 8.5
SRP1055-5R7M 5.70 ± 20 % 7.6 7.0 13.2
SRP1055-7R2M 7.20 ± 20 % 7.0 6.2 15.5
SRP1055-8R8M 8.80 ± 20 % 6.0 5.6 17.2
*RoHS COMPLIANT
DIMENSIONS: MM
(INCHES)
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
REV. 05/11
SRP1055 Series - Shielded Power Inductors
Packaging Specifications
26.0 + 0
(1.024 +0)
2.0 ± 0.5
(.079 ± .020)
50.0 - 0
(1.969 -0)
330.0
(13.00)
DIA.
13.0 ± 0.5
(.512 ± .020)DIA.
13.0 ± 0.5
(.512 ± .020)
DIA.
21.0 ± 0.8
(.827 ± .031)
EMBOSSED
CARRIER
EMBOSSED
CAVITY
0.10
(.004)
THICKNESS
MAX.
DIMENSIONS: MM
(INCHES)
4.0
(0.157)
16.0
(0.629)
END START
USER DIRECTION OF FEED
160
(6.299)
NO COMPONENT
MIN. MIN.
NO COMPONENT
COMPONENTS 400
(15.748)
1R41R4 1R4 1R4
Soldering Profile
25
75
125
175
225
275
0 50 100 150 200 250 300
Time (Seconds)
Temperature (°C)
120-150 seconds
60 seconds
maximum
260 °C peak
190°C
150 °C
220 °C
Ramp Down
5 °C/second
<1> 255 °C
<1>Maximum of 10 seconds
between +255 °C and +260 °C
Ramp Up
4 °C/second maximum
10 seconds minimum
