1© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard T2072_T551 • 10/21/2020
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
Built Into Tomorrow
Benets
• Includes F-Tech anode, which eliminates hidden defects in
the dielectric
• 100% simulated breakdown screening
• Maximum operating temperature of +125°C
• Polymer cathode technology
• ≤0.0075CV(µA)atratedvoltageafter5minutes
• Extremely low ESR
• High frequency and low temperature capacitance retention
• 100%constantvoltageconditioning(240hours)
• 100% surge current tested
• Volumetricallyecient
• Use at up to 80% of rated voltage
• Non-ignition failure mode
• Approximately 25% lighter than equivalent wet tantalum
• T551 case dimensions equivalent to
MIL-PRF-39006/22/25/30/31
• T556surfacemountdesign(seedimensionsdiagram)
Overview
The T551 axial leaded and T556 surface mount polymer
hermeticallysealed(PHS)devicesaretantalumcapacitors
with a Ta anode and Ta
2
O
5
dielectric. A conductive,
organic polymer replaces the traditionally used MnO
2
or
wet electrolyte as the cathode plate of the capacitor. The
result is very low ESR and improved capacitance retention
at high frequency and low temperature. The PHS device
also exhibits a benign failure mode, which eliminates the
case breach that can occur in wet tantalum capacitors.
Additionally, the part may be operated at voltages up to
80% of rated voltage, with equivalent or better reliability
than traditional MnO
2
or wet tantalum capacitors operated
at 50% of rated voltage.
PHS capacitors molded also offer higher ripple current
handling capability and a lower ESR range than wet
tantalums. With reduced ESR and enhanced capacitance
retention at higher frequencies and low temperatures, these
parts provide the highest total capacitance and the most
economical solution for high power applications, all within an
approximately 25% lighter package than the equivalent wet
tantalum capacitor.
Tantalum Polymer Capacitors – Hermetically Sealed
T551 Axial & T556 Surface Mount 125°C
2© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard T2072_T551 • 10/21/2020
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
Tantalum Polymer Capacitors – Hermetically Sealed
T551 Axial & T556 Surface Mount 125°C
Applications
Typicalapplicationsincludehighvoltagepowermanagement,suchasbuck/boostconverters,ltering,hold-upcapacitors,
and other high ripple current applications.
Ordering Information
T 551 B 107 M 025 A T 4251
Capacitor
Class
Series
Case
Size
Capacitance
Code(pF)
Capacitance
Tolerance
RatedVoltage
(VDC)
Product
Level
Termination
Finish
Surge Option*
Packaging*
T =
Tantalum
551 =
Axial
Leaded
PHS
556 =
Surface
Mount
PHS
B First two
digits
represent
signicant
gures.
Third digit
species
number of
zeros.
K = ±10%
M = ±20%
006 = 6.3
008 = 8
010 = 10
015 = 15
025 = 25
030 = 30
040 = 40
050 = 50
060 = 60
075 = 75
A = N/A T = 100% tin
(Sn)-plated
H = Tin/
lead(SnPb)
solder
coated(5%
Pbminimum)
Blank = 25°C ±5°C, 10
cycles, after constant
voltage conditioning
(KEMETstandard)
4251 = Surge current, 10
cycles, –55°C and +85°C
4252 = 10 cycles,
–55°C and +85°C
before constant voltage
conditioning
Blank = Bulk/
Sleeved
0100 = Bulk/
Unsleeved
7200 = Tape &
Reel/Sleeved
7293 = Ammo/
Sleeved
7443 = Ammo/
Sleeved
* Only for T551 (Surge options/packaging)
Performance Characteristics
Item Performance Characteristics
Operating Temperature −55°Cto125°C
Rated Capacitance Range 20–680μFat120Hz/25°C*
Capacitance Tolerance Ktolerance��(10%),Mtolerance(20%)
RatedVoltageRange 6.3–75V
DF(120Hzat25°C) RefertoPartNumberElectricalSpecicationTable
ESR(100kHzat25°C) RefertoPartNumberElectricalSpecicationTable
Leakage Current
RefertoPartNumberElectricalSpecicationTable
(ratedvoltageupto+85°Cand66%ofratedvoltageappliedat125°C)
Packaging T551 according to MIL-PRF-39006, T556 bulk
KEMET does not recommend storage above 85°C.
* Additional case sizes and capacitance/voltage are under development.