Datasheet TCO3A-200.TC Datasheet (Semtech)

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1

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TC03A-200

Battery Tracking TransClamp

™™

™™

™

For SLIC Linecard Protection

PRELIMINARY

Description

Features

Circuit Diagram Schematic & PIN Configuration

Revision 9/2000

The battery tracking TransClamp series of transient
voltage suppressors (TVS) are designed to protect
subscriber line interface circuits (SLIC) from transient
voltages resulting from lightning strikes and AC power
line disturbances. The TC03A-200 integrates all the
components necessary to protect SLIC ICs from line to
ground for positive and negative transients.

For negative transient events, the T VS thyristor will
crowbar or “fire” when the line voltage exceeds the
gate reference voltage. The gate voltage is referenced
to the battery voltage ( -V

BAT

) plus the VF of the series

rectifier. The device firing voltage range is -5V to

-100V. External diodes are used to shunt positive
transients to ground.

These devices are designed to meet industry standard
transient immunity requirements such as Bellcore TR­NWT-001089, FCC Par t 68, ITU K17-K20, and IEC
61000-4-5. The high surge capability is advantageous
in harsh environments, and offers better reliability than
"low surge" rated devices. The integrated design saves
board space and increases equipment reliability by
replacing multiple discrete components. The device
may be used to protect any SLIC and is particularly
suited for those with integrated ring generators.

Applications

Mechanical Characteristics

! Subscriber Line Interface Circuit (SLIC) Protection
! Central Office Equipment
! ISDN Terminal Adaptor s
! Cable Telephony
! Small Office Home Office (SOHO) Applications
! Wireless Local Loop (WLL)

! Transient protection for telecommunications lines to

Bellcore 1089 (long haul), VDE 0433, ITU K20
IEC 61000-4-5 (Lightning), and FCC Part 68

! High surge current rating (100A, tp = 10/1000µs)
! Protects up to two Tip & Ring line pairs
! Gate firing voltage is referenced to the system

battery voltage

! Wide firing voltage range: -5V to -100V
! High holding current: 200mA
! Replaces discrete components
! Solid-state TVS process technology

! JEDEC SOT-89 package
! Molding compound flammability rating:

UL 94V-0

! Marking : Part number, date code, logo
! Packaging : Tape and Reel per EIA 481

SOT-89 (Top View)

GND

-VBat

Line

2

3

1

123

LINE GND GATE

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TCO3A-200

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Absolute Maximum Rating

Electrical Characteristics

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TCO3A-200

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Typical Characteristics

Impulse Derating Curve

0

10

20

30

40

50

60

70

80

90

100

110

0 25 50 75 100 125 150

Ambient Temperature - T

A

(oC)

% of Rated Power or I

PP

Normalized Holding Current vs. Temperature

Reverse Leakage Current vs. temperature Normalized Gate Trigger Current vs. temperature

Diode Forward Voltage vs. Forward Current Impulse Response Characteristic

0

0.2

0.4

0.6

0.8

1

1.2

1.4

0 255075100125150

Junction temperature - TJ (

o

C)

Normalised Holding Curren

t

IH (TJ)/IH (25oC)

0.1

1

10

100

1000

0 25 50 75 100 125 150

Temperature (oC)

Reverse Leakage Current - I

DRM

(uA)

V

DRM

=-100V

0

0.2

0.4

0.6

0.8

1

1.2

0 20 40 60 80 100 120 140

Temperature (

o

C)

Normalised Gate Trigger Curren

0

1

2

3

4

5

6

0 20406080100120140160

Forward Current - IF (A)

Forward Voltage - V

F

(V)

1.2x50uSec 920V @ 50A with 0.1uFd

-95

-85

-75

-65

-55

-45

-35

-25

-15

-5

2.5 3.5 4.5 5.5 6.5 7.5 8.5 9.5 10.5 11.5 12.5

Time in uSe c

Volts

-50V Bias

-60V Bias

-70V Bias

-80V Bias

-90V Bias

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TCO3A-200

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SLIC Operating Voltages (Unbalanced Ringing)

Balanced Ringing

SLIC protection ConceptsSLIC protection Concepts

SLIC protection ConceptsSLIC protection Concepts

SLIC protection Concepts
Transient immunity standards require telecommunica-

tions equipment be surged in all of its operating states.
This refers to the “on-hook” state (ring generator or
ring detection monitoring) and the “off-hook” state
(operational state). The On-Hook state must allow for
operation of the normal battery voltage and ring
voltage without interference. The Off-Hook state only
allows for operation of the battery voltage plus opera­tion signals.

Several SLIC types exist. The first type of SLIC requires
an external ring relay to disconnect the SLIC and
connect the ringing and trip bias power supply generat­ing the ringing signal. Protection must be provided for
the subsystem which includes the ringing relay and
ringing source. This type of ringing is sometimes called
unbalanced ringing. The ringing voltage is typically
inserted on the Ring (B-lead), while the Tip (A-lead) is
grounded. The SLIC may or may not be protected by
the ringing subsystem protection. Separate subsystem
protection may be needed and must have a minimum
operating voltage that exceeds the battery voltage and
the ring signal voltage. The SLIC IC is disconnected
from the line and the ring generator and does not see
the ringing voltages. Therefore, the protection element
for the SLIC must only have a minimum operating
voltage greater than the battery supply voltage. This
device must suppress all transients above ground and
below the battery voltage.

The second SLIC type has an integrated ring generation
capability. The protection device described in this
application information is particularly suited for use
with this SLIC type. Unlike the unbalanced system
described above, these SLIC devices generate a
balanced ring signal between Tip & Ring. The voltage on
either line falls between the battery voltage and
ground. Therefore, the SLIC protection device can have
an operating voltage that is very close to the battery
voltage. Since battery voltages may vary between talk
and ringing states, it is desirable to utilize a program­mable protection device so that the voltage across the
SLIC does not exceed the process limits and the stress
on the device is minimized.

Tip

Ring

Battery

0V

Applications Information

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Applications Information (continued)

Protecting One SLIC Line PairProtecting One SLIC Line Pair

Protecting One SLIC Line PairProtecting One SLIC Line Pair

Protecting One SLIC Line Pair
The TC03A-200 battery tracking TransClamp is specifi-

cally designed to protect subscriber line interface
circuits (SLICs). The protection voltage of the device is
referenced to the system’s DC battery voltage. There­fore, the protection voltage will be essentially the same
as the SLIC supply voltage, minimizing the stress on
the protected device. The TC03A-200 may be refer­enced to battery voltages ranging from -5V to -100V.
Pin 1 is connected to the line (A-lead or B-lead). The
battery feed voltage source is connected to the gate of
the internal SCR at pin 3. Pin 2 is connected to
ground. A 0.1µF capacitor is recommended between
the gate & ground to speed up the triggering of the
device.

Protecting SLIC with Integrated Ring GeneratorProtecting SLIC with Integrated Ring Generator

Protecting SLIC with Integrated Ring GeneratorProtecting SLIC with Integrated Ring Generator

Protecting SLIC with Integrated Ring Generator

TC03 Connection DiagramTC03 Connection Diagram

TC03 Connection DiagramTC03 Connection Diagram

TC03 Connection Diagram

TC03A-200

TC03A-200

123

LINE GND GATE

Protecting Multiple SLIC LinesProtecting Multiple SLIC Lines

Protecting Multiple SLIC LinesProtecting Multiple SLIC Lines

Protecting Multiple SLIC Lines
The TC03A-200 may be used in conjunction with

steering diodes to protect up to two SLIC Tip & Ring
line pairs. The steering diodes shunt positive surges to
ground. In this configuration, each line pair may be
surged to 100A (tp=10/100µs) independantly, or all
four pairs may be surged simultaneously up to 50A
(tp=10/100µs). This provides the designer with a
flexible, cost effective solution and increased reliability
over low current protection schemes.

Typical Applications

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Typical Applications (continued)

Protecting SLIC with External Ring Generator

Protecting Multiple SLIC’s with External Ring Generators

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TCO3A-200

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Land Pattern - SOT-89

Outline Drawing - SOT-89

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Contact Information

Semtech Corporation

Protection Products Division

652 Mitchell Rd., Newbury Park, CA 91320

Phone: [phone] FAX [phone]

Ordering Information

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