www.circuitprotection.com

Applications:

• Cordless telephones

• VoIP gateways

• Fax machines

• Data modems

• Set-top boxes

• Security systems

• MDF modules

• Analog and ISDN linecards

Raychem Circuit Protection, the leader in innovative circuit protection solutions, has

introduced the industry’s first integrated overcurrent/overvoltage protection solu-

tion—the 2Pro device. The RoHS-compliant component incorporates PolySwitch

PPTC (Polymeric Positive Temperature Coefficient) and metal oxide varistor technol-

ogy in a single device to reduce board space requirements and component count.

Damage to telephony communications equipment can be caused by various

sources including lightning and ESD surges, power contact and induction with AC

lines. The 2Pro TM2P-10271 and TM2P-10271E devices help provide current limit-

ing during overcurrent events, and voltage clamping during overvoltage events.

After a fault condition is removed and power is cycled, 2Pro devices will reset so

that communications equipment remains operational.

With the introduction of the 2Pro devices Raychem Circuit Protection addresses the need for resettable circuit protection

devices for use in cost-sensitive PSTN (Public Switched Telephone Network) and VoIP (Voice over Internet Protocol) telepho-

ny equipment. The widespread use of VoIP gateways in homes and enterprise environments as the primary means of voice

delivery requires the utmost safety and reliability in equipment. 2Pro circuit protection devices are designed specifically to

help manufacturers comply with global safety standards, including UL 60950, TIA-968-A, IEC 60950, and ITU-T K.20/K.21. The

UL 497A listed protector also helps provide ESD protection.

2Pro Devices Help

Provide Reliable Connectivity

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

TM2P Electrical Characteristics

Electrical Schematic

Overcurrent (terminals 1 – 2)—Performance ratings @ 20°C

Resistance†

Time to Trip (s)†

IHOLD

ITRIP

(

Ω)@ 1A

(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

Ω)

(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.