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PRODUCT DATA SHEET
MICROPROFILE LINE MATCHING TRANSFORMER
Features
Surface Mount Lead-free (Pb-free) RoHS compliant 7mm seated height Vacuum encapsulated IEC 60950 and UL 60950 certified UL Recognized Component
P2781
Applications
Telecommunications V.22bis and V.32bis modems Line matching Portable computers Instrumentation
DESCRIPTION
P2781 is a microprofile transformer for applications where high performance and safety isolation to international standards are required in an extremely small case size. Designed specifically as a surface mount device, the P2781 features a 7mm seated height and is vacuum encapsulated and tested to 6500VDC. The part is compliant with RoHS Directive 2002/95/EC, and suitable for lead-free and conventional placement and reflow. At moderate transmit power levels (e.g. -10dBm) performance to V.32bis may be achieved. In instrumentation applications, the P2781 offers a wideband frequency response from 50Hz to 40kHz. P2781 is certified to IEC 60950 and UL 60950. P2781 is a UL Recognized Component, and is supported by an IEC CB Test Certificate.
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.
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P2781
SPECIFICATIONS
Electrical
At T = 25C and as circuit Fig. 1 unless otherwise stated. Parameter Insertion Loss Frequency response Conditions f = 2kHz, RL = 600 f = 2kHz, RL = 430 -3dB LF cutoff -3dB HF cutoff 200Hz - 4kHz 200Hz - 4kHz f = 450Hz 0dBm in line 3rd Harmonic DC - 5kHz Method TG25 Excitation 50Hz 250Vrms Output voltage across line 50Hz DC Ambient temperature -25 -40 +85 +125 95 C C %R.H. Min 18 Typ 50 40 Max 2.0 4.0 0.2 Units dB dB Hz kHz dB dB
Return Loss Distortion
(1)
80
-60 -
-54 -
dBm dB
Balance Saturation
3.88 5.5
-
10 65 -
Vrms Vpeak kVrms kV
Voltage Isolation (2) Operating range: Functional Storage(5) Humidity
Lumped equivalent circuit parameters as Fig. 1 DC resistance, RDC(3) Sum of windings Leakage inductance L Shunt inductance Lp(4) Shunt loss Rp(4) 10mV 200Hz 10mV 1kHz 10mV 200Hz 10mV 1kHz
205 4.2 1.4 5 -
1.8 10
245 4.9 3.5 15 -
mH H H k k
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P2781
Notes 1. Third harmonic typically exceeds other harmonics by 20dB. 2. Components 100% tested at 6.5 kVDC. 3. Caution: do not pass DC through windings. Telephone line current, etc. must be diverted using choke or semiconductor line hold circuit. 4. At signal levels greater than 100mV, Lp will increase and Rp will decrease slightly but the effect is usually favourable to the return loss characteristic. 5. Excludes shipping materials. Components are dry-packed and sealed as shipped. Handle in accordance with IPC/JEDEC J-STD-033 procedure for components classified as IPC/JEDEC J-STD-020 Moisture Sensitivity Level 5a.
Equivalent Circuit
F1 ig
IDEAL 1:1
ETALDOC 240/14
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P2781
PERFORMANCE
600 MATCH
Recommended Circuit
F2 ig
6.8 F 20%*
Return Loss
F4 ig
-14 -18
600
LINE
6.8nF + 5% _
6.8nF + 5% _
430 + 2% _
dB -22
-26 -30
Worst Case T ypic al
* If return loss > 16d B, 300Hz - 4kHz is acc eptable, b loc king c ap a citor ma y b e rela xed to 4.7 F + 50% _
20%
100Hz
200 300
500
1kHz 2 Frequency
3
45
10
F requency R esponse
F3 ig
0
T hird Harmonic Distortion vs. S ignal Level
F5 ig
-60 Funda mental 450Hz T ic al yp
T hird Harmonic dBc
1kHz 2 Frequency 3 45 10
-0.1
-65
-0.3 -0.4 100Hz
W or st
Ca
dB -0.2
y T
se
a p ic
l
-70
-75
200 300
500
-80 -15
-10 -5 Fundamental P ower (dBm)
0
Frequency response driven by terminal equipment (voltage scource with 430 series resistance) measured across 600 is within 0.2dB 200Hz to 4kHz
Note: To obtain harmonic distortion power in dBm, add fundamental power in dBm to third harmonic in dBc e.g. at -10dBm power in line at 450Hz, third harmonic power is -10 + (-74) = -84dBm typical.
Recommended Circuit
Fig 6
Recommended Circuit
F7 ig
The circuit of Fig. 6 gives good TX and RX flatness (0.3dBm 200Hz - 4kHz). An alternative arrangement, using existing PCB sites, is shown in Fig. 7. Note, however, that TX flatness will be degraded with the topology.
ETALDOC 240/14 Page 4 of 5 October 2007
P2781
CONSTRUCTION
Connections
Fig 9
Dimensions
F8 ig
2.54 2.54 (0.1) (0.1)
e3
9.0 max (0.36) 7.0 max (0.28)
13.0 max (0.51)
1 2 3
6 5 4
1.77 (0.07) 1.32 (0.052)
1.5 (0.06)
NOT : E
Dimensions shown are in millimetres (inches)
T olerance 0.3mm T erminals electroplated pure tin (S 5m minimum. n) JES D97 Category = e3. T erminal size : 1.5 (0.06) long, 1.32 (0.05) wide
Dimensions shown are in millimetres (inches). Geometric centres of outline and pad grid coincide within a tolerance circle of 0.3mmO. Windings may be used interchangeably as primary or secondary.
SAFETY
Manufactured from materials conforming to flammability requirements of UL94V-0. Distance through reinforced insulation 0.4mm minimum. Creepage and clearances in circuit are 7mm minimum where PCB pads do not exceed 3mmO. Construction complies with IEC 60950-1, EN 60950-1 and UL 60950-1, reinforced insulation, 250Vrms maximum working voltage.
CERTIFICATION
Certified by BSI to IEC 60950 Third Edition (1999) (IEC CB Test Certificate No. GB592W) sub-clauses 1.5, 1.5.1, 1.5.2, 2.9, 2.9.1, 2.9.2, 2.9.3, 2.9.4, 2.9.5, 2.10, 2.10.1, 2.10.2, 2.10.3, 2.10.3.1, 2.10.3.2, 2.10.4, 2.10.5, 2.10.5.1, 2.10.7, 2.10.8, 4.7, 4.7.3, 4.7.3.1, 4.7.3.4, (Flammability Class V-0) ,5.2, 5.2.1, and 5.2.2 for a maximum working voltage of 250Vrms, nominal mains supply voltage not exceeding 250Vrms and a maximum operating temperature of +85C in Pollution Degree 2 environment, reinforced insulation. Recognized under the Component Recognition Program of Underwriters Laboratories Inc. to US and Canadian requirements CAN/CSA C22.2 No. 60950-1-03/UL60950-1, First Edition, based on IEC 60950-1, First Edition, maximum working voltage 250Vrms, Pollution Degree 2, reinforced insulation. UL File number E203175. Additionally, Profec Technologies certifies all transformers as providing voltage isolation of 3.88kVrms, 5.5kV DC minimum. All shipments are supported by a Certificate of Conformity to current applicable safety standards.
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P2781
ABSOLUTE MAXIMUM RATINGS
(Ratings of components independent of circuit). Short term isolation voltage (2s) DC current Storage temperature Soldering temperature Profile peak 4.6 kVrms, 6.5kVDC 100A -40C to +125C 260C 10s
COPYRIGHT
ETAL and P2781 are Trade Marks of Profec Technologies Ltd. The Trade Mark ETAL is registered at the UK Trade Marks Registry. Profec Technologies Ltd. is the owner of the design right under the Copyright Designs and Patents Act 1988 and no rights or licences are hereby granted or implied to any third party. British Patent No. 2283195 US Patent No. 5879598 European Patent No. 0725719 (c) 1997 - 2005 Profec Technologies Ltd. Reproduction prohibited.
Recommended peak body temperature 245C in accordance with IPC/JEDEC J-STD-033.
ORDERING CODE P2781
TR = Tape and Reel (Blank) = Bulk in tubes. Carrier tape width 24mm, 500 parts per 13" reel.
E203175
ETAL Group Oy, Kuormatie 14, FIN-03101, Nummela Telephone: +358 (0)20 7500 330 Fax: +358 (0)20 7500 333 Website: www.etalgroup.com Email: etalgroup@egruppen.com
ISO 9001 FM 25326
ETALDOC 240/14
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October 2007

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