Introduction to SLIC Overvoltage

Protection Devices

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Outline

Littelfuse SLIC Protection– The SLIC & Ringing Functions– Fixed Negative Solutions

P0641SC Family

– LCAS Solutions P1200CC / P2000CC / A1220

– Negative Tracking B1101UC Family

– VoIP Solutions P0641DF-1E Family

– Positive / Negative Tracking B3104UC Family

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SLIC Overvoltage Protection SLIC & Ringing Functions

POTS (Plain Old Telephone Service) requires two distinct signal types for telephones:

Subscriber Line Interface Circuit

-48V

H.V. Ring∿∿∿∿∿

∿ Generato

r

Ring Relay

TelephoneLine

SLIC Protection

POTS Protection

SLIC provides “Off-Hook” services. Ring Generator provides high voltage

ringing signal.

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SLIC Overvoltage Protection Fixed Negative Solutions

POTS (Plain Old Telephone Service) requires two distinct signal types for telephones:

Positive Surges Taken to Ground by the Diode. Negative Surges (beyond VBO) Taken to Ground by the SIDACtor.

Subscriber Line Interface Circuit

-48V

SLIC Protection

Subscriber Line Interface Circuit

-48V

SLIC Protection

-48V

Positive Surge Pulse

Negative Surge Pulse

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SLIC Overvoltage Protection Fixed Negative Solutions – P0641SC Family

The P0641SC Family of Fixed Negative SIDACtor Solutions:

P0641CA2

VBO

SLIC A: TO-220C: CompakS: SMB PkgQ22: QFNU: MS-013

A: ITU SurgeC: GR-1089 Surge

SIDACtor

Optional Circuit Count

e.g. P0641SC

e.g. P1701AC2

e.g. P1101CA2

e.g. P0901UC

e.g. P0641Q22C

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LCAS (Solid-State Relay) Protection

LCAS (Line Circuit Access Switch) is a solid-state relay that replaces the mechanical ring relay.

Subscriber Line Interface Circuit

-48V

H.V. Ring∿∿∿∿∿

∿ Generato

r

TelephoneLine

SLIC Protection

LCAS Protection

LCAS Relays are more delicate than mechanical ring relays.

LCAS Relays require specialized VBO protection devices.

LCASTip

Ring

120V

200V or 250V

Tip

Ring

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VBO#2 10

VBO#1 10

SLIC Overvoltage Protection LCAS Solutions

Littelfuse Fixed Voltage SIDACtor Solutions:

P2500SC

VBO

Bidirectional

SMB Pkg

A: ITU SurgeB: TIA-968-A SurgeC: GR-1089 Surge

SIDACtor

e.g. P1200SC e.g. A1220UC4

A1220UC

MS-013 Pkg

A: ITU SurgeB: TIA-968-A SurgeC: GR-1089 Surge

Asymmetric SIDACtor

·l·

·l·

2 Ports per Device2 Devices per Port

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Self-Ringing SLICsBattrax® Negative Tracking Devices

Self-Ringing SLICs require protection that tracks the variable DC supply voltage:

-VVariable

DC Supply

+

TelephoneLine

Battrax Protection

Self-Ringing

SLIC

-V

Positive Surge Pulse

Negative Surge Pulse

Gate Current

Positive Surges Taken to Ground by the Diode. Negative Surges (beyond -V) Taken to Ground by the SCR.

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SLIC Overvoltage Protection Negative Tracking Battrax® Solutions

The B1101UC Family of Fixed Negative SIDACtor Solutions:

B1101UC4

SLIC MS-013

C: GR-1089 Surge

Battrax®Optional Circuit Counte.g. B1161UC

e.g. B1201UC4

IH 10

·l·

Neg Tracking

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VoIP SLICs

VoIP (Voice over Internet Protocol) SLICs create telephone lines at the customer’s premises but connect to the PSTN via an internet connection.

Subscriber Line Interface Circuit

8 – 40V

TelephoneLine

Fixed Voltage

SLIC Protection

The SLIC provides ringing signal from a low voltage battery using an integrated DC-DC converter.

The ring voltage may be software controlled, but is usually fixed for any particular application.

Therefore, fixed voltage protection is the best solution.

Integrated DC-DC

Converter

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SLIC Overvoltage Protection VoIP SLICs - P0641DF-1E Family

The P0641DF Family of Fixed Negative SIDACtor Solutions:

P0641DF-1E

VBO

SLIC

MS012 (SO-8) Package

ITU K.20 / K.21 & GR-1089 Intra-Building Surge Rating

SIDACtor

Single

Optional Enhanced Diode Performance

Pin-to-Pin compatible with industry standard SO-8 tracking devices.

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Positive / Negative Ringing SLICsFor Long Telephone Lines

Ringing long telephone lines requires extra voltage.

Sometimes a positive / negative ringing SLIC is used:

-48V

+VPositive

DC Supply

-

TelephoneLine

Battrax Protection

Self-Ringing

SLIC-V

Positive Surge Pulse

Negative Surge Pulse

Gate Current+Negative

DC Supply

-V

Gate Current

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SLIC Overvoltage Protection Positive / Negative Tracking Solutions

The B3000 Family of Pos / Neg Tracking Battrax® Solutions

B3104UC

SCR Count

MS-013

A: ITU SurgeC: GR-1089 Surge

Battrax®

e.g. B3164UCIH 10

·l·Pos / Neg Tracking

Discrete Pos / Neg Tracking Battrax® Solutions

B2050CC

SingleA: ITU SurgeC: GR-1089 Surge

Battrax®

IH 10

·l·

Pos Tracking

B1100CC

SingleA: ITU SurgeC: GR-1089 Surge

Battrax®

IH 10·l·Neg TrackingCompak Compak

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Thank You!

Introduction toSLIC Overvoltage Protection