PRODUCT DATA SHEET
MICROPROFILE LINE P2781
MATCHING TRANSFORMER
Features Applications
Surface Mount Telecommunications
Lead-free (Pb-free) V.22bis and V.32bis modems
RoHS compliant Line matching
7mm seated height Portable computers
Vacuum encapsulated Instrumentation
IEC 60950 and UL 60950 certified
UL Recognized Component
DESCRIPTION
P2781 is a microprofile transformer for applications At moderate transmit power levels (e.g. -10dBm)
where high performance and safety isolation to performance to V.32bis may be achieved.
international standards are required in an extremely
small case size. In instrumentation applications, the P2781 offers a
wideband frequency response from 50Hz to
Designed specifically as a surface mount device, the 40kHz.
P2781 features a 7mm seated height and is vacuum
encapsulated and tested to 6500VDC. The part is P2781 is certified to IEC 60950 and UL 60950.
compliant with RoHS Directive 2002/95/EC, and P2781 is a UL Recognized Component, and is
suitable for lead-free and conventional placement supported by an IEC CB Test Certificate.
and reflow.
Despite the subminiature size, the performance is
the equal of that of much larger components. The
P2781 offers reinforced insulation, is ideal for voice
telecommunications and for data communications to
medium speed, and can be matched to both 600
and complex impedance telephone lines.
ETALDOC 240/14 Page 1 of 5 October 2007
P2781
SPECIFICATIONS
Electrical
At T = 25C and as circuit Fig. 1 unless otherwise stated.
Parameter Conditions Min Typ Max Units
Insertion Loss - - 2.0 dB
f = 2kHz, R = 600
L
- - 4.0 dB
f = 2kHz, R = 430
L
Frequency response -3dB LF cutoff - 50 - Hz
-3dB HF cutoff - 40 - kHz
200Hz - 4kHz - - 0.2 dB
Return Loss 200Hz - 4kHz 18 - - dB
(1)
f = 450Hz
Distortion
0dBm in line
3rd Harmonic - -60 -54 dBm
Balance DC - 5kHz 80 - - dB
Method TG25
Saturation Excitation 50Hz
250Vrms
Output voltage - - 10 Vrms
across line - - 65 Vpeak
Voltage 50Hz 3.88 - - kVrms
(2)
DC 5.5 kV
Isolation
Operating range: Ambient temperature
Functional - +85 C
-25
(5)
- +125 C
Storage
-40
- 95 %R.H.
Humidity
-
Lumped equivalent circuit parameters as Fig. 1
(3)
DC resistance, R Sum of windings 205 - 245
DC
Leakage 4.2 - 4.9 mH
inductance L
Shunt 10mV 200Hz 1.4 - 3.5 H
(4)
10mV 1kHz - 1.8 - H
inductance Lp
(4)
10mV 200Hz 5 - 15
Shunt loss Rp k
10mV 1kHz - 10 -
k
ETALDOC 240/14 Page 2 of 5 October 2007