SiBar Thyristor
Surge Protectors
SA and SC series thyristor products for overvoltage protection
Tyco Electronics SiBar®thyristor
surge protectors are designed to
protect sensitive telecommunications
equipment from the hazards caused
by lightning, power contact, and power
induction. These devices have high
surge capability to protect against
transient faults and high off-state
impedance, rendering them
transparent during normal system
operation.
Target Applications:
SiBar thyristor surge protectors are
designed specifically for
telecommunications and computer
telephony applications, including:
Modems
Fax machines
PBX systems
Phones
POS systems
Analog and digital linecards
xDSL modes and splitters
Other customer premise and
network equipment requiring
protection
Benefits:
Effective protection for sensitive
telecom electronics
Low leakage current
Low power dissipation
Fast, reliable operation
No wear-out mechanisms
Helps designers meet worldwide
telecom standards
Reduced warranty and service costs
Easy installation; tape and reel per
EIA 481 standards
Features:
Bidirectional transient voltage protection
High off-state impedance
Low on-state voltage
High surge capability
Glass-passivated junctions
Short-circuit failure mode
Surface-mount technology
SiBar thyristor surge protectors
provide transient voltage protection
for telecommunications applications.
Fundamentals of SiBar Thyristor Surge Protection Devices
SiBar thyristor surge protectors are
bidirectional silicon devices that fold back in
the presence of transient overvoltage faults.
When the breakover voltage of a SiBar device
is exceeded, the device switches from high to
low impedance to protect sensitive
downstream equipment from harmful voltage
surges. The device remains latched in a low-
impedance state until the current decreases
below the hold current, at which point the
device returns to its high-impedance state.
SiBar devices may be used in conjunction
with PolySwitch®resettable fuses in
telecommunications applications, including
network equipment, customer premise
equipment, and primary protectors. Proper
selection of both devices can provide reliable
and cost-effective resettable overvoltage and
overcurrent protection. These devices help
designers to meet worldwide
telecommunications standards and to lower
equipment-service and warranty costs.
* Superseded by UL 1950, 3rd Edition for new designs.
Note: For more information on PolySwitch resettable fuses for overcurrent protection, please contact your local Raychem representative or visit our Web site
(www.circuitprotection.com)
Typical applications
Problem/solution
Industry standards and customer
specifications require telecommunications
equipment designers to protect against the
harmful effects of power cross, power
induction, and lightning surges. These
hazards can travel through the network and
local loop, resulting in equipment damage and
loss of service.
A SiBar thyristor surge protector, either by
itself or properly coordinated with a
PolySwitch overcurrent device, will assist in
protecting against these faults, minimizing
equipment damage and improving customer
satisfaction.
Customer premise equipment (CPE)
SiBar devices have been designed to assist
customer premise equipment manufacturers
meet the stringent requirements of
FCC part 68, UL1459/UL1950 3rd Edition,
UL497A, and ITU-T Recommendation K.21.
Examples of customer premise equipment
include:
PBX systems
Key telephone systems
Modems
Phone sets
POS equipment
Surge strips with communication ports
Network equipment
SiBar devices have been designed to assist
network equipment manufacturers meet the
stringent requirements of Telcordia GR-1089,
ITU-T Recommendations K.17, K.20, and K.45.
Examples of network equipment include:
Analog and digital linecards
Base stations
Meter monitoring systems
Multiplex/pairgain systems
Remote terminal units
Repeaters
Customer premise equipment protected with
SiBar and PolySwitch devices
Network equipment protected with SiBar and
PolySwitch devices
Symbol key:
SiBar thyristor surge protector (transient voltage protector)
PolySwitch resettable fuse (overcurrent protection device)
Grounded
T
R
Z
Z
T
Ungrounded
R
CPE CPE
Z
Z
T
Grounded
R
Z
Z
Z
Linecard
Note:
T-R SiBar thyristor is optional;
refer to SiBar application notes
(www.circuitprotection.com)
SiBar thyristor surge protectors and PolySwitch resettable fuses are designed to work together to effectively protect telecommunications equipment
from transient overcurrent and overvoltage faults defined by regional agency specifications.
Specifications PolySwitch Resettable Fuse SiBar Surge Protector
ITU-T K.20 TR250, TS250, TSV250 TVB170SA, TVB200SA, TVB270SA
ITU-T K.21 TR250, TS250, TSV250 TVB170SA, TVB200SA, TVB270SA
ITU-T K.45 TR250, TS250, TSV250 TVB170SA, TVB200SA, TVB270SA
FCC Part 68 TR600-150, TS600-170 TVB270SA
UL 1459* TR600-150, TS600-170 TVB270SA
UL 1950 TR600-150, TS600-170 TVB270SA
Telcordia GR1089 TR600-160-RA, TS600-200-RA TVB170SC, TVB200SC, TVB270SC
Telcordia GR1089 Intrabuilding TR250, TS250, TSV250 TVB170SA, TVB200SA, TVB270SA
Selection Guide
Follow these steps to select the proper SiBar
thyristor surge protectors for your application:
1. Define the operating parameters for
the circuit:
Maximum ambient operating
temperature
Maximum system operating current
Maximum operating voltage
(DC bias + peak ringing voltage)
Maximum fault current
System voltage damage threshold
2. Select a SiBar device with an off-state voltage
rating (VDM) above the maximum operating
voltage and a peak pulse current rating above
the maximum fault current.
3. Verify that the minimum hold current of the
device is above the maximum short-circuit
current of the system.
4. Verify that the maximum breakover voltage of
the device is below the system damage
threshold.
5. Verify that the circuit’s ambient operating
temperatures are within the SiBar device’s
operating temperature range.
6. Verify that the SiBar device’s dimensions fit
the application’s space considerations.
7. Independently evaluate and test the suitability
and performance of the SiBar device in the
application.
VDM VBO IHVTC1ITSM Lightning Current Wave Forms
Part max. max. min. max. typ min. FCC Telcordia ITU
number (V) (V) (mA) (V) (pF) (A) 5x320 µs 10x560 µs 10x160 µs 10x1000 µs 2x10 µs 5x310 µs
TVB270SC 270 370 175 5.0 50 60 100 100 200 100 500 100
TVB200SC 200 320 175 5.0 50 60 100 100 200 100 500 100
TVB170SC 170 265 175 5.0 50 60 100 100 200 100 500 100
TVB270SA 270 370 175 5.0 20 22 90 70 100 50 - 90
TVB200SA 200 320 175 5.0 20 22 90 70 100 50 - 90
TVB170SA 170 265 175 5.0 20 22 90 70 100 50 - 90
Notes (1) (2) (3) (4) (5) (5) (5) (5) (5) (5) -
Notes:
1. VDM measured per UL497B pulse requirements; max. off-state leakage current (IDM) = 5 µA.
2. Measured at a typical breakover current (IBO) = 230 mA.
3. C, measured at f = 1 MHz, 50-VDC bias, 1 VRMS
4. Peak on-state surge current (60 Hz, one cycle).
5. Refer to application notes (www.circuitprotection.com) for further details.
Electrical Characteristics (25° C, Unless Otherwise Specified)
Electrical Characteristics (25° C, Unless Otherwise Specified)
Parameter Symbol Unit TVBxxxSA TVBxxxSC
Peak on-state surge current
(60Hz, one cycle) ITSM A2260
Critical rate-of-rise of on-state current
(max. 2 x 10-µs waveform, ISC =120A) di/dt A/µs 150 250
Critical rate-of-rise of off-state voltage
(linear waveform, VD= Rated VBO, Ti= 25°C) dv/dt V/µs 2000 2000
Storage temperature °C65 to 150 65 to 150
Operating temperature °C40 to 125 40 to 125
Junction temperature °C 175 175
Symbol Parameter Definition
VBO Breakdown voltage Maximum voltage across the device at breakdown
measured under a specified voltage and current rate of rise.
IBO Breakdown current Instantaneous current flowing at the breakover voltage (VBO)
IHHold current Minimum current required to maintain the device in the on-state condition.
ITOn-state current Current through the device in the on-state condition.
VTOn-state voltage Voltage across the device in the on-state condition at a specified current (IT)
VDM Maximum off-state Maximum DC voltage that can be applied to the device while maintaining
voltage it in the off-state condition.
IDM Off-state current Maximum DC value of current that results from the application of the maximum
off-state voltage.
IPP Peak pulse current Rated peak pulse current of specified amplitude and waveshape.
that may be applied without damage.
di/dt, dv/dt Critical rate of rise of Maximum current and voltage rate of rise the device can withstand
on-state current and voltage without damage.
Voltage-Current Characteristics
VDM VBO
VT
IDM
IBO
IH
IT
IPP
I
V
The voltage-current (V-I) is useful in depicting
the electrical characteristics of the SiBar thyristor surge
protectors in relation to each other.
Typical Electrical Characteristics vs. Temperature
Off-state voltage vs. temperature
Temperature (°C)
Percentage of VDM at 25° C
50
120%
115%
110%
105%
100%
95%
90%
85% 25 0 25 50 75 100 125 150
Hold current vs. temperature
Temperature (°C)
Percentage of IH at 25° C
50
200%
180%
160%
140%
120%
100%
80%
60%
40%
20% 25 0 25 50 75 100 125 150
SiBar SA and SC devices are offered in industry-
standard “SMB” device packages for easy
installation.
All devices are bidirectional and may be oriented
in either direction during installation.
ABCD *
min. max. min. max. min. max. min. max.
Millimeters 4.06 4.57 3.30 3.81 1.90 2.41 1.96 2.11
Inches 0.160 0.180 0.130 0.150 0.075 0.095 0.077 0.083
HJKPS
min. max. min. max. min. max. ref. min. max.
Millimeters 0.051 0.152 0.15 0.30 0.76 1.27 0.51 5.21 5.59
Inches 0.002 0.006 0.006 0.012 0.030 0.050 0.020 0.205 0.220
* D dimension is measured within dimension P.
Typical Electrical Characteristics vs. Temperature (continued)
Breakover voltage vs. temperature
Temperature (°C)
Percentage of VBO at 25° C
25 50 75 100 125 15050
115%
110%
105%
100%
95%
90% 25 0
100
10
1
0.1
0.01
0.001
IDM (mA)
25 0 25 50 75 100 125 150
Temperature (°C)
Off-state current vs. temperature
Product Dimensions
C
H
J
P
K
A
S
DB
Product description
TVBXXXSA
TVBXXXSC
Devices per reel* 2500 pieces
Standard box quantity 10,000 pieces
Approximate box weight 3.5 lb
Recommended Pad Layout
The dimensions in the table below provide the
recommended pad layout for each SiBar device.
A
C
B
Pad dimensions
AB C
Millimeters 2.261 2.159 2.743
Inches 0.089 0.085 0.108
Part Marking System
Device code Part number*
REBD TVB270SC
RDBD TVB200SC
RCBD TVB170SC
REBB TVB270SA
RDBB TVB200SA
RCBB TVB170SA
Ordering Information
*Supplied in embossed tape and reel format per EIA 481-1 standards.
WARNING!
Operation beyond maximum ratings or improper use may result in device damage.
These devices are intended for protection against occasional overvoltage fault conditions and should not be used
when repeated fault conditions are anticipated.
Three-digit date code
Device code
Marking
Worldwide Headquarters
308 Constitution Drive
Menlo Park, CA 94025-1164
Tel (800) 227-7040
(650) 361-6900
Fax (650) 361-2508
www.circuitprotection.com
PolySwitch and SiBar are registered trademarks of Tyco Electronics Corporation.
All information, including illustrations, is believed to be reliable. Users, however, should independently evaluate the suitability of each product for their
application. Tyco Electronics 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 Company’s Standard Terms and Conditions of Sale for this product, and in no case will Tyco
Electronics be liable for any incident, 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 changes–without notification to Buyer–to materials or
processing that do not affect compliance with any applicable specification.
© 2001 Tyco Electronics Corporation RCP0023.0201.5000