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Integrated Overcurrent/Overvoltage Protection Solutions for Telephony Equipment
APPLICATION NOTE
www.circuitprotection.com
Figure 1. Representative schematic for 2Pro
Figure 2. Representative schematic for 2Pro
devices in ungrounded system
devices in grounded system
(T)
(R)
Telecom
Line
2Pro Device
T
elecom
Equipment
Applications:
Cordless telephones
VoIP gateways
Fax machines
Data modems
Set-top boxes
Security systems
MDF modules
Analog and ISDN linecards
Raychem Circuit Protections 2Pro device is an integrated overcurrent/overvoltage
circuit protection device, designed to help protect cost-sensitive PSTN (Public
Switched Telephone Network) and VoIP (Voice over Internet Protocol) telephony
equipment from damage caused by lightning and ESD surges, power contact and
induction with AC lines. If left unprotected from these hazards, CPE (Customer
Premise Equipment) may fail or may pose a safety risk for subscribers and main-
tenance personnel.
The widespread adaptation of VoIP gateways in homes and enterprise environ-
ments has resulted in increasingly stringent safety requirements for CPE. The
2Pro device helps equipment manufacturers comply with UL 60950 and remain
operational after specified lightning tests. It also helps equipment comply with
surge tests per TIA-968-A, IEC 60950, and ITU-T K.20/K.21. The UL 497A listed
protector also helps provide ESD protection.
The RoHS-compliant 2Pro device incorporates PolySwitch PPTC (polymeric positive temperature coefficient) overcurrent
technology with an MOV (metal oxide varistor) component into one innovative, thermally protected device to help provide
resettable current limiting during overcurrent events and voltage clamping during overvoltage events. This single-device
approach to coordinated circuit protection helps reduce component count and improve equipment reliability.
Integrated Overcurrent/Overvoltage
Protection Solutions for Telephony Equipment
Benefits:
Single device helps reduce component
count and footprint
Helps reduce warranty returns
Helps equipment comply with surge
tests per: TIA-968-A, IEC 60950,
ITU-T K.20/K.21
Helps simplify UL 60950 testing
Helps equipment comply with UL 60950
Features:
Single overcurrent, overvoltage
and ESD protection device
Resettable overcurrent protection
UL 497A listed protector
(#E258475)
RoHS compliant
(T)
(R)
Telecom
Line
2Pro Device
2Pro Device
T
elecom
Equipment Voltageopen circuit
Currentshort circuit
Parameter
Voltage (V)
Waveform (
)
Current (A)
Waveform (
)
Repetitions
TIA-968 Lightning Type A Metallic
800
10 x 560
100.0
10 x 560
1 ea. Polarity
TIA-968 Lightning Type A Longitudinal
1500
10 x 160
200.0
10 x 160
1 ea. Polarity
TIA-968 Lightning Type B Metallic
1000
9 x 720
25.0
5 x 320
1 ea. Polarity
TIA-968 Lightning Type B Longitudinal
1500
9 x 720
37.5
5 x 320
1 ea. Polarity
ITU-T K.20/K.21
1500
10 x 700
37.5
5 x 310
5 ea. Polarity
Enhanced Lightning (TM2P-10271E only)
4000
1.2 x 50
0
333.0
8 x 20
0
5 ea. Polarity
Lightning Withstand for the Assembly (terminals 1 3) @ 20°C
Figure 3. Representative 2Pro device response under TIA-968-A
Figure 4. Representative 2Pro device response under
metallic Line Surge A
ITU-Tk.20/K.21 Surge
TM2P-10271 · TIA-968-A · 10/560
µs
R(source) = 8
, V(open circuit) = 800V
0
50
100
150
200
250
300
350
400
450
500
0.00
0.25
0.50
0.75
1.00
1.25
1.50
1.75
2.00
2.25
2.50
0
5
10
15
20
25
30
35
40
45
50
Voltage (pPTC)
Voltage (MOV)
Current (Input)
Cur
r
ent (A)
V
o
ltag
e (V)
Time (ms)
R
S
T
e
lecom
Equipment
U(t)
TM2P-10271 device · ITU-T K.20/K.21 · 10/700
µs
R(source) = 40
, V(open circuit) = 1.5kV
0
50
100
150
200
250
300
350
400
450
500
0.00
0.25
0.50
0.75
1.00
1.25
1.50
1.75
2.00
2.25
2.50
0
5
10
15
20
25
30
35
40
45
50
Voltage (pPTC)
Voltage (MOV)
Current (Input)
Cur
r
ent (A)
V
o
ltag
e (V)
Time (ms)
R
S
T
e
lecom
Equipment
U(t)
TM2P Electrical Characteristics
Electrical Schematic
Overcurrent (terminals 1 2)Performance ratings @ 20°C
Resistance
Time to Trip (s)
IHOLD
ITRIP
(
)
@ 1 A
(A)
(A)
R min.
R max.
R1 max*
Typ
Max
0.15
0.30
7.0
14.0
16.0
0.3
3
0.15
0.30
6.0
12.0
14.0
0.4
4
Part Number
TM2P-10271
TM2P-10271E
Part Number
TM2P-10271
TM2P-10271E
Overvoltage (terminals 2 3)
Varistor Voltage
DC Resistance
Maximum Clamping
Rated
V @ 1 mA
@ 100 V
Voltage @ 25 A
Wattage
DC (V)
Tolerance
(M
)
(V)
(W)
270
± 10%
>10
455
0.25
270
± 10%
>10
455
0.25
(3)
(2)
(1)
* Maximum device resistance at
20°C measured 1 hour post trip.
Corresponds to operation below
varistor voltages.
Data is preliminary.
2Pro, PolySwitch, Raychem, and Tyco are trademarks. All information, including illustrations, is believed to be reliable. Users, however, should independently evaluate the suitability of each product for their application.
Tyco Electronics Corporation makes no warranties as to the accuracy or completeness of the information, and disclaims any liability regarding its use. Tyco Electronics only obligations are those in the Companys
Standard Terms and Conditions of Sale for this product, and in no case will Tyco Electronics be liable for any incidental, indirect, or consequential damages arising from the sale, resale, use or misuse of the product.
Specifications are subject to change without notice. In addition, Tyco Electronics reserves the right to make changeswithout notification to Buyerto materials or processing that do not affect compliance with any
applicable specification.
Worldwide Headquarters
308 Constitution Drive, MS R21/2A
Menlo Park, CA USA 94025-1164
Tel
(800) 227-7040
(650) 361-6900
Fax
(650) 361-2508
www.circuitprotection.com
www.circuitprotection.com.hk (Chinese)
www.raychem.co.jp/polyswitch (Japanese)
© 2006 Tyco Electronics Corporation. Printed in USA. RCP0073.0606.xxx
Summary
Resettable circuit protection solutions help enable communications equipment to remain operational after electrical fault con-
ditions. The innovative 2Pro device addresses the need for an affordable resettable circuit protection solution option that can
help protect equipment from a multitude of overcurrent and overvoltage events.