TAJE337M004RNJ AVX Corporation, TAJE337M004RNJ Datasheet - Page 15

• Manufacturer Part Number: TAJE337M004RNJ
• Description: CAPACITOR TANT 330UF 4V 20% SMD
• Manufacturer: AVX Corporation
• Series: TAJr
• Type: Moldedr

Specifications of TAJE337M004RNJ

• Capacitance: 330µF
• Voltage - Rated: 4V
• Tolerance: ±20%
• Operating Temperature: -55°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 2917 (7343 Metric)
• Size / Dimension: 0.287" L x 0.169" W (7.30mm x 4.30mm)
• Height: 0.161" (4.10mm)
• Manufacturer Size Code: E
• Features: General Purpose
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Spacing: -
• Esr (equivalent Series Resistance): -
• Lead Free Status / RoHS Status: Compliant, Lead free / RoHS Compliant
• Other names: TAJE337M004R; TAJE337M004R

Technical Summary and
Application Guidelines
The heat generated inside a tantalum capacitor in a.c.
operation comes from the power dissipation due to ripple
current. It is equal to I
current at a given frequency, and R is the ESR at the same
frequency with an additional contribution due to the leakage
current. The heat will be transferred from the outer surface by
conduction. How efficiently it is transferred from this point is
dependent on the thermal management of the board.
The power dissipation ratings given in Section 2.1 are based
on free-air calculations. These ratings can be approached if
efficient heat sinking and/or forced cooling is used.
2.2 Thermal Management
2
R, where I is the rms value of the
LEAD FRAME
Thermal Impedance Graph with Ripple Current
140
120
100
SOLDER
80
60
40
20
0
Thermal Dissipation from the Mounted Chip
= PCB MAX Cu THERMAL
0
TEMPERATURE DEG C
0.1 0.2 0.3
236 C\WATT
X
X - RESULTS OF RIPPLE CURRENT TEST - RESIN BODY
X
X
POWER IN UNIT CASE, DC WATTS
C CASE SIZE CAPACITOR BODY
THERMAL IMPEDANCE GRAPH
0.4
PRINTED CIRCUIT BOARD
0.5 0.6
TANTALUM
ANODE
= PCB MIN Cu AIR GAP
121 C\WATT
0.7 0.8 0.9
In practice, in a high density assembly with no specific
thermal management, the power dissipation required to give
a 10°C rise above ambient may be up to a factor of 10
less. In these cases, the actual capacitor temperature should
be established (either by thermocouple probe or infra-red
scanner) and if it is seen to be above this limit it may
be necessary to specify a lower ESR part or a higher
voltage rating.
Please contact application engineering for details or contact
the AVX technical publication entitled “Thermal Management
of Surface Mounted Tantalum Capacitors” by Ian Salisbury.
1.0
73 C\WATT
1.1 1.2 1.3
= CAP IN FREE AIR
ENCAPSULANT
1.4
COPPER
43