HSMS-285B-TR1G Avago Technologies US Inc., HSMS-285B-TR1G Datasheet - Page 9

• Manufacturer Part Number: HSMS-285B-TR1G
• Description: DIODE SCHOTTKY DETECT SS SOT-323
• Manufacturer: Avago Technologies US Inc.

Specifications of HSMS-285B-TR1G

• Diode Type: Schottky - Single
• Voltage - Peak Reverse (max): 2V
• Capacitance @ Vr, F: 0.3pF @ 1V, 1MHz
• Package / Case: SC-70-3, SOT-323-3
• Diode Case Style: SOT-323
• No. Of Pins: 3
• Peak Reflow Compatible (260 C): Yes
• Leaded Process Compatible: Yes
• Forward Voltage: 250mV
• Repetitive Reverse Voltage Vrrm Max: 2V
• Pin Count: 3
• Forward Current If: 1mA
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Max: -
• Power Dissipation (max): -
• Resistance @ If, F: -
• Lead Free Status / Rohs Status: Compliant

SMT Assembly
Reliable assembly of surface mount components is a
complex process that involves many material, process,
and equipment factors, including: method of heating
(e.g., IR or vapor phase reflow, wave soldering, etc.)
circuit board material, conductor thickness and pattern,
type of solder alloy, and the thermal conductivity and
thermal mass of components. Components with a low
mass, such as the SOT packages, will reach solder reflow
temperatures faster than those with a greater mass.
Avago’s diodes have been qualified to the time-tem-
perature profile shown in Figure 17. This profile is repre-
sentative of an IR reflow type of surface mount assembly
process.
After ramping up from room temperature, the circuit
board with components attached to it (held in place
with solder paste) passes through one or more preheat
Figure 17. Surface Mount Assembly Profile.
9
Tp
T
25
L
Lead-Free Reflow Profile Recommendation (IPC/JEDEC J-STD-020C)
Note 1: All temperatures refer to topside of the package, measured on the package body surface
Reflow Parameter
Average ramp-up rate (Liquidus Temperature (T
Preheat
Ts(max) to TL Ramp-up Rate
Time maintained above:
Peak Temperature (T
Time within 5 °C of actual
Peak temperature (t
Ramp-down Rate
Time 25 °C to Peak Temperature
Ts
Ts
min
max
t 25
Preheat
P
°
P
)
ts
)
C to Peak
Temperature Min (T
Temperature Max (T
Time (min to max) (t
Temperature (T
Time (t
Ramp-up
Time
L
)
S(max)
L
)
to Peak)
Ramp-down
tp
S(min)
S(max)
S
)
zones. The preheat zones increase the temperature of
the board and components to prevent thermal shock
and begin evaporating solvents from the solder paste.
The reflow zone briefly elevates the temperature suffi-
ciently to produce a reflow of the solder.
The rates of change of temperature for the ramp-up and
cool-down zones are chosen to be low enough to not
cause deformation of the board or damage to compo-
nents due to thermal shock. The maximum temperature
in the reflow zone (T
These parameters are typical for a surface mount assem-
bly process for Avago diodes. As a general guideline, the
circuit board and compo nents should be exposed only to
the minimum temperatures and times necessary to achieve
a uniform reflow of solder.
)
t
)
L
Lead-Free Assembly
3°C/ second max
150°C
200°C
60-180 seconds
3°C/second max
217°C
60-150 seconds
260 +0/-5°C
20-40 seconds
6°C/second max
8 minutes max
Critical Zone
T
L
to Tp
MAX
) should not exceed 260°C.