Nemco Electronics Part Numbering System - Manual

PCT Series
Example: PCT10/16CK
PCT 10 16 C K (optional)
TB Series
Example: TB10/35K1
TB 10 35 K 1 (optional) (optional)
Series Capacitance Voltage Tolerance Lead spacing LF TR = Tape & Reel Packaging
in microfarads code TA = Ammo Packaging
36
Part Numbering
Series Capacitance Voltage Case Size Tolerance
in microfarads
LSR Series
Example: LSR470/10HK100
LSR 470 10 H K 100 (optional)
Series Capacitance Voltage Case Size Tolerance Max ESR
in microfarads milliohms
MCT and CGT Series
Examples: MCT1/16RM7500 or CGT1/16RM7500
MCT or CGT 1 16 R M 7500
Series Capacitance Voltage Case Size Tolerance Max ESR
in microfarads milliohms
LF = lead free, RoHS compliant
LF = lead free, RoHS compliant
Tolerances
M (+ 20%)
K (+ 10%)
J (+ 5%) may be
available upon request,
contact the factory
Case Sizes
PCT / LSR MCT / CGT
A (3216-18) P (1005-07)
B (3528-21) R (1608-10)
C (6032-28)
D (7343-31)
H (7343-43)
Z (7361-37)
Low Profile
XL (2012-12)
AL (3216-12)
BL (3528-12)
CL (6032-15)
DL (7343-20)
Lead Spacing
Codes
TB
1 ( 0.1 inches )
2 ( 0.2 inches )
250 ( 0.25 inches )
E1 ( 0.1 snap in )
E2 ( 0.2 snap in )
F ( 0.1 inches )
Voltages
PCT MCT
LSR CGT TB
4 2 6 (6.3)
6 (6.3) 3 10
10 4 16
16 5 20
20 6 (6.3) 25
25 10 35
35 16 50
50 25
Standard packaging is tape and reel, 7” diameter reel. (For 13” dia. reel please contact the factory for ordering information)
Standard packaging is tape and reel, 7” diameter reel. (For 13” dia. reel please contact the factory for ordering information)
Only available in M tolerance.
Only available lead-free, RoHS compliant.
Standard packaging is tape and reel, 4” diameter reel. (For 7” dia. reel please contact the factory for ordering information)
All Nemco products are manufactured lead-free and RoHS compliant.
The use of the “LF” suffix code is optional when customers choose to establish a unique part number.
(forward slash)
(forward slash)
(forward slash)
(forward slash)
Standard packaging is bulk.
Catalog data relates to an ambient temperature of +25°C measured at 125 Hz, 0.5V RMS unless otherwise specified.
Substitutions of higher voltage ratings, lower ESR values, tighter capacitance tolerances and higher temperature rated devices
will increase performance and reliability.
Advantages of tantalum capacitors are:
•
High volumetric efficiency.
• Stable electrical performance over temperature (T.C. 12%).
• Operating temperature range –55°C to +125°C, 2/3 Vr (linear derating) above +85°C, CGT series is derated above +40°C.
• Better frequency characteristics than aluminum electrolytics.
• Self-Healing, no wear out mechanism. No degradation in performance or reliability.
• No limitation on shelf life.
Surge voltages may be applied up to ten times in an hour for periods up to 30 seconds at a time. They are not intended for
continuous operation and should not be used as a parameter for design. See table below.
Voltage derating improves the operating reliability of a tantalum capacitor. Select a higher voltage rated part (30% to 70%)
than the maximum line voltage. In the case of low impedance circuits, the tantalum capacitor is likely to be stressed by current
surges. In circuits which undergo rapid charge/discharge, a protective resistor of 1.0 ohm per applied volt is recommended. If
this is impossible, a voltage-derating factor of up to 70% is recommended. A combination of tantalum capacitors can be
connected in series to increase working voltage of the equivalent capacitor. In many power supply topologies where the di/dt
through the capacitor is limited, such as most implementations of buck (current mode), forward converter and flyback, the
requirement for series resistance is decreased to 0.1 ohm per applied volt. This level of resistance is used as a basis for the series
resistance variable in a 1%/1000 hours 60% confidence level reference. This is what steady state life tests are based on. Certain
test circuits such as ICT are likely to subject the capacitor to large voltage and current transients, which will not be seen in
normal use. This should be taken into account when considering the capacitors rated voltage.
A small amount of reverse voltage is permissible for short periods. It is not intended to cover continuous operation.
Maximum reverse voltages are:
+25°C 10% of rated voltage not exceeding 1.0 volt
+85°C 3% of rated voltage not exceeding 0.5 volt
+125°C 1% of rated voltage not exceeding 0.1 volt
Tantalum capacitors are polar devices. A non-polar effect can be created by connecting two devices, arranged back-to-back (-
to -). The capacitance value of each part should be twice the required capacitance value, equal tolerance and rated voltage. For
example, two PCT10/35DK devices connected in a back-to-back configuration would result in a non-polar 5ufd, 35volt device.
In DC-DC converters, the input side is typically fed from voltage sources, which are not regulated and are of nominally low imped-
ance. This type of application severely stresses the capacitor. A higher than normal failure rate level may be experienced.
Maximum voltage derating and use of low ESR devices is recommended.
Higher capacitances and even lower ESR
Values can be achieved by connecting tantalum capacitors in parallel.
Electrostatic Discharge
Tantalum capacitors demonstrate no sensitivity to ESD.
Flammability UL Rating UL94 VO, Oxygen Index 35%. Epoxy, Hysol MG 33.
Tips for Design and Use
Rated Derated
Working Surge DC Surge
Voltage Voltage Voltage Voltage
+85°C +85°C +125°C +125°C
2 2.7 1.3 1.7
3 3.9 2.0 2.6
4 5.2 2.7 3.2
5 6.5 3.3 4.0
6 8 4 5
10 13 7 8
16 20 10 12
20 26 13 16
25 32 17 20
35 46 23 28
50 65 33 40