Surface-mount
PolySwitch Surface-mount
Resettable Devices
More than ten years ago,
Raychem Circuit Protection intro-
duced the SMD product family,
and polymeric PTC devices
quickly became the computer
industry standard for keyboard,
mouse, and disk drive protection.
In 1995, Raychem Circuit
Protection advanced the technol-
ogy, reducing the size and cost of
surface-mount resettable devices
with the introduction of its
miniSMD product series. The
recent additions to the surface-
mount family include the
nanoSMD series, which reduces
the size to a 3216mm (1206mils)
foot print, one-third the size of the
popular miniSMD series.
4
Features:
• Broadest range of resettable
devices available in the industry
• Current ratings from 0.05 to 3A
• Voltage ratings from 6V comput-
er and electronic applications to
60V (600V Telecom)
• Agency recognition: UL, CSA,
TÜV
• Small footprint
• Fast time-to-trip
• Low resistance
Benefits:
• Smaller size saves board space
and cost
• Many product choices give
engineers more design flexibility
• Compatible with high-volume
electronics assembly
• Assists in meeting regulatory
requirements
• Higher voltage ratings allow use
in new applications
Applications:
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Computer motherboards
Modems
USB hub, ports and peripherals
IEEE1394 ports
Digital cameras
Disk drives
CD-ROMs
Game machines
Battery packs
Phones
Fax machines
Analog and digital line cards
Printers
PDAs
Chargers
Products in this section are grouped by:
Product Dimensions, Product Series, Hold Current
Raychem Circuit Protection Devices
PolySwitch Surface-mount Resettable Devices
183
Selection Guide for Surface-mount Devices
Step 1.
Determine the circuit’s operating parameters.
Fill in the following information about the circuit:
Maximum ambient operating temperature
Normal operating current
Maximum operating voltage
(i.e. miniSMDC014 is 60V
DC
max.)
Maximum interrupt current
Step 2.
Select the PolySwitch device that will accommodate the
circuit’s maximum ambient temperature and normal
operating current.
Look across the top of Table S2 to find the temperature that most
closely matches the circuit’s maximum operating temperature. Look
down that column to find the value equal to or greater than the circuit’s
normal operating current. Now look to the far left of that row to find the
part number for the PolySwitch surface mount device that will best
accommodate the circuit. Devices in this section are grouped by
device dimensions, so your operating-current requirement may be
found in more then one grouping.
The thermal derating curves located in Figure S1 are the normalized
representations of the data in Table S2.
Step 3.
Compare the selected device’s maximum electrical rat-
ings with the circuit’s maximum operating voltage and
interrupt current.
Look down the first column of Table S3 to find the part number you
selected in Step 2. Look to the right in that row to find the device’s
maximum operating voltage (V
MAX
) and maximum interrupt current
(I
MAX
). Ensure that V
MAX
and I
MAX
are greater than or equal to the circuit’s
maximum operating voltage and maximum interrupt current.
4
184
PolySwitch Surface-mount Resettable Devices
Raychem Circuit Protection Devices
Surface-mount
Step 4.
Determine time-to-trip.
Time-to-trip is the amount of time it takes for a device to switch to a
high-resistance state once a fault current has been applied across the
device. Identifying the PolySwitch device’s time-to-trip is important in
order to provide the desired protection capabilities. If the device you
choose trips too fast, undesired or nuisance tripping will occur. If the
device trips too slowly, the components being protected may be
damaged before the device switches to a high-resistance state.
Figures S11-S18 show the typical time-to-trip at 20°C for each of the
PolySwitch devices.
If the PolySwitch device's time-to-trip is too fast or too slow for the
circuit, go back to Step 2 and choose an alternate device.
Step 5.
Verify ambient operating conditions.
Ensure that your application’s minimum and maximum ambient
temperatures are within the operating temperature of -40˚C to 85˚C
(-40˚C to 125˚C for SMDH160).
Step 6.
Verify the PolySwitch device dimensions.
Using dimensions in Table S4, compare the dimensions of the
PolySwitch device you selected with the application’s space con-
siderations.
4
Raychem Circuit Protection Devices
PolySwitch Surface-mount Resettable Devices
185
Protection Application Selection Table for Surface-mount Devices
The table below lists Polyswitch
devices typically used in these
applications.
Specifications for the suggested
device part numbers can be
found in this section.
Once a part has been selected,
the user should evaluate and test
each product for the intended
application.
Protection Application
AC adapter input power
Battery pack protection
Charger protection
CPU/IC protection
Data acquisition/sensor
DC input/output power
DDC
Device Bay system
Ethernet/Lan
Fan
IEEE-1394
Additional Comments
use w/ Zener & triac
Overcurrent
Overvoltage
≤6V
≤12V
DB12, DB20
DB32
power provider
alt. power provider
self-powered
4
LCD inverter
LCD screen power
LNB (Low Noise Block)
Motor
PS/2 mouse/keyboard
Signal - data communication
≤6V
≤13.2V
≤6V
≤13.2V
≤30V
SCSI
Smart card reader
Telecom - modem
UL1950
ITU-T K.21
Digital line
Telecom - PBX
UL1950
ITU-T K.21
Subscriber
Telcordia
GR-1089
ITU-T K.20
Telcordia GR1089
CPU
Individual Port
2 port ganged
3 port ganged
4 port ganged
Telecom - line card
OC
OV
OC
OV
OC
OV
OC
OV
OC
OV
OC
OC
OV
OC
OV
Intrabuilding protection
Temperature sensor
USB
PolySwitch Resettable Devices—Key Selection Criteria
Fast Time-to-trip
Small Size
Low Resistance
(Temperature Protection)
SMD250
SMD250
SMD200
nanoSMDC150
miniSMDC260
miniSMDE190
nanoSMDM050
miniSMDM110/16
nanoSMDM075
nanoSMDM100
nanoSMDC150
nanoSMDM075
microSMD005
—
microSMD005
nanoSMDM075
nanoSMDC150
nanoSMDM050
miniSMDC075
miniSMDM110/16
miniSMDC075
nanoSMDM075
nanoSMDM100
nanoSMDM050
miniSMDC200
miniSMDC260
miniSMDC200
miniSMDC260
SMD300
miniSMDM200
nanoSMDM050
miniSMDM110/16
nanoSMDM075
microSMD035
microSMD050
microSMD035
SMD100/33
SMD185
SMD100/33
SMD185
SMD185
SMD150/33
SMD185
SMD185
SMD150/33
nanoSMDM050
miniSMDM110/16
nanoSMDM075
nanoSMDM050
nanoSMDM050
microSMD035
SMD075
SMD075
SMD050
nanoSMDM100
nanoSMDC150
microSMDM075
miniSMDC075
miniSMDM110/16
miniSMDC075
nanoSMDM075
nanoSMDM100
nanoSMDM050
nanoSMDM075
nanoSMDM075
nanoSMDM075
miniSMDC050
miniSMDM075
miniSMDC020
SMD030-2018
SMD075
SMD050
nanoSMDM100
nanoSMDC150
nanoSMDM075
microSMD010
microSMD035
microSMD005
TS600-170
TS250-130
TS600-170
TVB270SA or SC*
TVB270SA or SC*
TVB270SA or SC*
TS250, TSV250
TS250, TSV250-130
TS250-130-RB
TVB270SA*
TVB270SA*
TVB270SA*
miniSMDC014
miniSMDC014
miniSMDC014
TVB270SC*
TVB270SC*
TVB270SC*
TS600-170
TS600-200-RA
TS600-170
TVB270SA or SC*
TVB270SA or SC*
TVB270SA or SC*
TS250, TSV250
TS250-130
TS250-130-RB
TVB270SA*
TVB270SA*
TVB270SA*
miniSMDC014
miniSMDC014
miniSMDC014
TS600-200-RA-B-0.5
TS600-200-RA-B-0.5
TS600-200-RA-B-0.5
TVB270SC*
TVB270SC*
TVB270SC*
TS250, TSV250
TS250-130-RA
TS250
TVB270SA*
TVB270SA*
TVB270SA*
TSL250-080
SMD030-2018
TSL250-080
nanoSMDM050
nanoSMDM075
nanoSMDM050
nanoSMDM075
nanoSMDM100
nanoSMDM050
nanoSMDC150
miniSMDC150
miniSMDC125
miniSMDC200
miniSMDM200
miniSMDM200
miniSMDC260
miniSMDM260
miniSMDM260
*Refer to the SiBar thyristor product section for more information.
This list is not exhaustive. Raychem Circuit Protection welcomes our customers’ input for additional application ideas for Polyswitch Resettable devices.
186
PolySwitch Surface-mount Resettable Devices
Raychem Circuit Protection Devices
Surface-mount
Table S1. Product Series: Size, Current Rating, Voltage Rating/Typical Resistance for Surface-mount
Devices
nanoSMDC
nanoSMDM
Size mm (mils)
Hold Current (A)
0.05
0.08
0.13
0.14
0.17
0.18
0.20
0.30
0.35
0.50
0.75
1.00
1.10
3216 (1206)
—
—
—
—
—
—
—
—
—
—
6V
DC
/0.40Ω
6V
DC
/0.20Ω
6V
DC
/0.15Ω
—
microSMD
3225 (1210)
—
30V
DC
/25Ω
—
—
—
—
—
—
—
6V
DC
/0.81Ω
13.2V
DC
/0.55Ω
6V
DC
/0.29Ω
—
6V
DC
/0.14Ω
miniSMDC
miniSMDM
4532 (1812)
—
—
—
—
60V
DC
/4.0Ω
—
—
30V
DC
/1.4Ω
—
—
15V
DC
/0.60Ω
13.2V
DC
/0.23Ω
24V
DC
/0.20Ω
—
6V
DC
/0.12Ω
8V
DC
/0.14Ω
16V
DC
/0.12Ω
6V
DC
/0.09Ω
6V
DC
/0.07Ω
8V
DC
/0.066Ω
—
—
6V
DC
/0.050Ω
8V
DC
/0.040Ω
—
6V
DC
/0.035Ω
6V
DC
/0.030Ω
—
midSMD
5050 (2018)
—
—
—
—
—
—
—
—
60V
DC
/1.4Ω
—
—
—
SMD
7555 (2920)
—
—
—
—
—
—
—
—
60V
DC
/3.0Ω
—
60V
DC
/0.87Ω
30V
DC
/0.67Ω
SMD2
8763 (3425)
—
—
—
—
—
—
—
—
—
—
—
—
—
—
miniSMDE
11550 (4420)
——
—
—
—
—
—
—
—
—
—
—
—
—
—
TS250
TSL250
TSV250
*
—
—
80V/12.5Ω
60V/6.0-8.0Ω
—
—
—
—
—
—
—
—
—
—
TS600
*
—
—
—
—
—
60V/11.0Ω
—
60V/8.5Ω
—
—
—
—
—
—
15V
DC
/0.25Ω 30V
DC
/0.30Ω
33V
DC
/0.27Ω
—
—
1.25
1.50
1.60
1.85
1.90
2.00
2.50
2.60
3.00
—
6V
DC
/0.08Ω
—
—
—
—
—
—
—
—
6V
DC
/0.07Ω
—
—
—
—
—
—
—
—
15V
DC
/0.13Ω
—
—
—
6V
DC
/0.07Ω
—
—
—
15V
DC
/0.16Ω
—
—
—
—
—
—
6V
DC
/0.05Ω
6V
DC
/0.033Ω
—
15V
DC
/0.16Ω
33V
DC
/0.15Ω
16V
DC
/0.10Ω
33V
DC
/0.12Ω
—
15V
DC
/0.09Ω
15V
DC
/0.06Ω
—
—
—
—
—
—
16V
DC
/0.065Ω
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
4
*Refer to Telecommunications and Networking section for dimensions; voltage for these parts is RMS max.
Raychem Circuit Protection Devices
PolySwitch Surface-mount Resettable Devices
187
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