BOURNS SM74120

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Features
Applications
■ Dual SMD package with transmit and
■ Telecom
receive transformer
■ Low height of only 6.2 mm
■ Lead free version available (see How to
Order)
■ Lead free versions are RoHS compliant*
SM74120 - T1/CEPT/ISDN-PRI Transformer
Electrical Specifications @ 25 °C
Primary Pins
Core A ........................................16-14
Core B ............................................6-8
Ratio (±2 %)
Core A ..............................1:1 & 1:1.26
Core B ....................................1CT:2CT
OCL (mH) min.
Core A & B ......................................1.2
Leakage Inductance (µH) max.
Core A & B ....................................0.60
Cww (pF) max.
Core A & B ........................................30
DCR of primary (Ω) max.
Core A & B ....................................0.70
DCR of secondary (Ω) max.
Core A............................................0.80
Core B............................................1.00
HIPOT (VAC) ....................................1500
Operating Temperature (°C) ........0 to +70
Product Dimensions
Electrical Schematic
12.0
MAX.
(.472)
CORE A
1
16
16
9
8.76 - 9.52
(.345 - .375)
7.0
(.276)
MAX.
SM74120
XXYY
1
2
8
3
14
0.46 ± .51
(.018 ± 0.02)
1.27
(.050)
TYP.
CORE B
6
11
7
10
8
9
*CT : center tap
Packaging Specifications
Tape & Reel* ........................700 pcs./reel
*“E” suffix at end of part number
designates tape & reel packaging, e.g.
SM74120E.
6.22
(0.245)
MAX.
DIMENSIONS ARE:
1.02
(0.040)
MM
(INCHES)
How to Order
SM74120E __
Model
TOLERANCE: ±
0.254
(.010)
Termination
Blank = Tin-lead
L = Tin only (lead free)
03/05
*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.