4.0 ± 0.3
(.157 ± .012)
4.0 ± 0.3
(.157 ± .012)
MAX.
1.2
(.047)
1.65 ± 0.2
(.065 ± .008)
4.3
(.169)
0.9
(.035)
4.3
(.169)
Features
■ Semi-shielded construction
■ Low profi le: 1.2 mm
■ Inductance range: 0.47 to 22 µH
■ Rated current up to 3.2 A
■ RoHS compliant* and halogen free**
SRN4012 Series - Semi-shielded Power Inductors
*RoHS Directive 2002/95/EC Jan. 27, 2003 including annex and RoHS Recast 2011/65/EU June 8, 2011.
**Bourns follows the prevailing defi nition of “halogen free” in the industry. Bourns considers a product to be “halogen
free” if (a) the Bromine (Br) content is 900 ppm or less; (b) the Chlorine (Cl) content is 900 ppm or less; and (c) the
total Bromine (Br) and Chlorine (Cl) content is 1500 ppm or less.
Specifi cations are subject to change without notice.
The device characteristics and parameters in this data sheet can and do vary in different applications and actual device
performance may vary over time.
Users should verify actual device performance in their specifi c applications.
Operating Temperature
................................. -40 °C to +125 °C
(Temperature rise included)
Storage Temperature .. -40 °C to +125 °C
Resistance to Solder Heat
...............................+260 °C for 40 sec.
Temperature Rise .....40 °C at rated Irms
Rated Current
............ Inductance drops 30 % at Isat
Electrical Specifi cations @ 25 °C
Bourns Part No.
Inductance
@ 100 KHz / 0.1 V
DCR
(Ω)
Max.
Irms
(A)
Isat
(A)L (μH) Tol. %
SRN4012-R47M 0.47 20 0.03 3.2 4
SRN4012-1R0M 1.0 20 0.045 2.2 2.8
SRN4012-1R5M 1.5 20 0.06 2 2.2
SRN4012-2R2M 2.2 20 0.072 1.9 1.65
SRN4012-3R3M 3.3 20 0.101 1.7 1.4
SRN4012-4R7M 4.7 20 0.114 1.5 1.2
SRN4012-6R8M 6.8 20 0.15 1.3 0.9
SRN4012-100M 10 20 0.204 1.1 0.8
SRN4012-220M 22 20 0.48 0.62 0.5
General Specifi cations
Core ..............................................Ferrite
Wire ............................Enameled copper
Terminal Finish ...................................Sn
Coating .................Magnetic epoxy resin
Packaging ..... 4000 pcs. per 13-inch reel
Materials
Product Dimensions
Recommended Layout
Electrical Schematic
DIMENSIONS:
MM
(INCHES)
*RoHS COMPLIANT
How to Order
SRN4012 - R47M
Model
Value Code (see table)
Soldering Profi le
Max. Peak Temperature 260 ഒ40 sec. max.
Max. Time Above 217 ഒ: 60~150 sec. max.
Peak Temperature260 ഒ max.
25
Temperature (°C)
Time (Seconds)
Reflow Times: 3 Times Max.
Preheating Soldering Natural Cooling
217 °C
Peak Temperature (260 °C, 40 Sec. Max.)
200 °C
150°C
60~180
Sec.
480 Sec. Max.
60~150 Sec.
20~40 Sec.
1.0
This series is currently available, but
not recommended for new designs.
The Model SRN4012T Series is
the recommended alternative.
