Overcurrent protection
Rods, uncoated, 500 V
Applications
Overcurrent protection
Short circuit protection
For high operating voltages
Features
Leaded rod-type thermistor
Low mounting height
RoHS-compatible
Delivery mode
Bulk
Dimensional drawing
B404, B406
Dimensions (mm)
Type
B404
B406
General technical data
Max. operating voltage for B404 and B406
Rated voltage for B404 and B406
Switching cycles
Reference temperature
Operating temperature range
Operating temperature range
(T
A
= 60
°C)
V
max
V
R
N
T
ref
T
op
T
op
550
500
100
60
40/+125
0/+60
V DC or V AC
V DC or V AC
°C
°C
°C
a
3.5
±1.5
3.5
±1.5
12.5
±1
12.5
±1
l
max
17
17
(typ.)
(V = 0)
(V = V
max
)
Electrical specifications and ordering codes
Type
I
R
I
S
I
Smax
I
r
(V = V
max
) (typ.)
(V = V
max
)
A
mA
1.0
1.0
R
R
∆R
R
R
min
Ordering code
mA
mA
Ω
3500
5500
%
±16
±28
Ω
2880
3800
B59404B0060A040
B59406B0060A040
Rated voltage = 500 V DC or V AC
B404
4
9
0.4
B406
2.5
6.5
0.3
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 2 of 9
Overcurrent protection
Rods, uncoated, 500 V
Cautions and warnings
General
EPCOS thermistors are designed for specific applications and should not be used for purposes
not identified in our specifications, application notes and data books unless otherwise agreed
with EPCOS during the design-in-phase.
Ensure suitability of thermistor through reliability testing during the design-in phase. The ther-
mistors should be evaluated taking into consideration worst-case conditions.
Storage
Store thermistors only in original packaging. Do not open the package before storage.
Storage conditions in original packaging: storage temperature 25
°C
... +45
°C,
relative hu-
midity
≤75%
annual mean, maximum 95%, dew precipitation is inadmissible.
Avoid contamination of thermistors surface during storage, handling and processing.
Avoid storage of thermistor in harmful environment with effect on function on long-term opera-
tion (examples given under operation precautions).
Use thermistor within the following period after delivery:
Through-hole devices (housed and leaded PTCs): 24 months
Motor protection sensors, glass-encapsulated sensors and probe assemblies: 24 months
Telecom pair and quattro protectors (TPP, TQP): 24 months
Leadless PTC thermistors for pressure contacting: 12 months
Leadless PTC thermistors for soldering: 6 months
SMDs in EIA sizes 3225 and 4032, and for PTCs with metal tags: 24 months
SMDs in EIA sizes 0402, 0603, 0805 and 1210: 12 months
Handling
PTCs must not be dropped. Chip-offs must not be caused during handling of PTCs.
Components must not be touched with bare hands. Gloves are recommended.
Avoid contamination of thermistor surface during handling.
Soldering (where applicable)
Use rosin-type flux or non-activated flux.
Insufficient preheating may cause ceramic cracks.
Rapid cooling by dipping in solvent is not recommended.
Complete removal of flux is recommended.
Standard PTC heaters are not suitable for soldering.
B404, B406
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 5 of 9
Embedded System
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