參數(shù)資料
型號(hào)： HSDL-3612-038
英文描述： IrDA Data Compliant 115.2kb/s 3V to 5V Infrared Transceiver
中文描述： IrDA數(shù)據(jù)符合115.2kb / s的3V至5V的紅外收發(fā)器
文件頁(yè)數(shù)： 14/25頁(yè)
文件大?。?/td> 356K
代理商： HSDL-3612-038
14
The reflow profile is a straight-
line representation of a nominal
temperature profile for a
convective reflow solder process.
The temperature profile is divided
into four process zones, each
with different
T/
time
temperature change rates. The
T/
time rates are detailed in the
above table. The temperatures
are measured at the component
to printed circuit board
connections.
In
process zone P1
, the PC
board and HSDL-3612
castellation I/O pins are heated
to a temperature of 125
°
C to
activate the flux in the solder
paste. The temperature ramp
up rate, R1, is limited to 4
°
C per
second to allow for even heating
of both the PC board and
HSDL-3612 castellation I/O pins.
Process zone P2
should be of
sufficient time duration (> 60
seconds) to dry the solder paste.
The temperature is raised to a
level just below the liquidus point
of the solder, usually 170
°
C
(338
°
F).
Process zone P3
is the solder
reflow zone. In zone P3, the
temperature is quickly raised
above the liquidus point of solder
to 230
°
C (446
°
F) for optimum
results. The dwell time above the
liquidus point of solder should be
between 15 and 90 seconds. It
usually takes about 15 seconds to
assure proper coalescing of the
solder balls into liquid solder and
the formation of good solder
connections. Beyond a dwell time
of 90 seconds, the intermetallic
growth within the solder
connections becomes excessive,
resulting in the formation of weak
and unreliable connections. The
temperature is then rapidly
reduced to a point below the
solidus temperature of the solder,
usually 170
°
C (338
°
F), to allow
the solder within the connections
to freeze solid.
Process zone P4
is the cool
down after solder freeze. The
cool down rate, R5, from the
liquidus point of the solder to
25
°
C (77
°
F) should not exceed
-3
°
C per second maximum. This
limitation is necessary to allow
the PC board and HSDL-3612
castellation I/O pins to change
dimensions evenly, putting
minimal stresses on the
HSDL-3612 transceiver.
Reflow Profile
0
t-TIME (SECONDS)
P2
SOLDER PASTE DRY
T
200
183
170
150
125
100
50
50
150
100
200
250
300
230
P1
HEAT
UP
P3
SOLDER
REFLOW
P4
COOL
DOWN
25
R1
R2
R3
R4
R5
90 sec.
MAX.
ABOVE
183°C
MAX. 245°C
Process Zone
Heat Up
Solder Paste Dry
Symbol
P1, R1
P2, R2
P3, R3
DT
25
°
C to 125
°
C
125
°
C to 170
°
C
170
°
C to 230
°
C
(245
°
C at 10 seconds max.)
230
°
C to 170
°
C
170
°
C to 25
°
C
Maximum DT/Dtime
4
°
C/s
0.5
°
C/s
4
°
C/s
Solder Reflow
P3, R4
P4, R5
-4
°
C/s
-3
°
C/s
Cool Down
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