HEN-1.5/25-D12M-C Murata Power Solutions Inc, HEN-1.5/25-D12M-C Datasheet - Page 10

• Manufacturer Part Number: HEN-1.5/25-D12M-C
• Description: DC/DC Converters & Regulators 37.5W 12V-1.5V 25A Eighth-Brick
• Manufacturer: Murata Power Solutions Inc
• Series: HENr

Specifications of HEN-1.5/25-D12M-C

• Output Power: 38 W
• Input Voltage Range: 10.2 V to 13.8 V
• Number Of Outputs: 1
• Output Voltage (channel 1): 1.5 V
• Output Current (channel 1): 25 A
• Package / Case Size: Eighth Brick
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: HEN-1.5/25-D12M-C

In the drawing below, these dimensions are intended for initial search for
these marks by your camera. There will be tiny variations in absolute posi-
tion from unit to unit.
If you use a camera above the pcb after placement on the solder paste, do
not rely on the inkjet marking on the heat shield to verify proper orientation.
Use the pin 1 notch instead.
Coplanarity: DATEL manufactures these converters with very flat mounting
leads (see coplanarity specs) however your host pcb must also be flat for a
successful mounting. Be aware of possible warping of the pcb under heat
gradients and/or humidity conditions. The solder paste will tolerate a small
amount of mismatch and will tend to “wet” the entire pad area by capillary
action if the temperatures are correct.
Vacuum Pickup: Select the vacuum collet on your SMT placement system
for the weight and size of the DC/DC converter. Note that units with
heatsinks are slightly heavier. Tests at DATEL have shown that excellent
acceleration and transit head speed are available for these converters if
the collet size is proper and the vacuum is sufficient. When positioning the
vacuum collet, use the geometric center of the heat shield as the pickup
area since the center of gravity is very close.
Soldering
Reflow technology works well for small parts. However, larger components
such as these DC/DC’s with higher thermal mass may require additional
Figure 7. Fiducial Mark Location
www.murata-ps.com
reflow time (but not enough to disturb smaller parts also being reflowed
concurrently with the DC/DC). When this is combined with higher tem-
perature lead-free solders (or solders with reduced heavy metals), there is
increased risk of reheating components inside the DC/DC enough so that
they either change positions (and possibly stop functioning) or the compo-
nents are damaged by the heat.
For these reasons, DATEL developed disposable heat shields using high
temperature plastic. The DC/DC is installed and reflowed with the shield in
place. After successful reflow and cooling, and before washing, the heat
shield should be removed.
Temperature Profiling
We wish to ramp the temperature up and down to successfully reflow the
solder without heat damage. Each reflow oven, humidity conditions, solder
paste type, oven feed rate, and the number of heat zones all require a dif-
ferent profile. Therefore you may have to experiment.
Since these converters are constructed using high temperature solders,
there will be no heat problems on your host pcb using traditional solder
with 63% lead and 37% tin with a melting point of +183°C. Device lead
temperature must remain below 230°C for less than 75 seconds, assuming
that the heat shield is in place. DATEL uses a 216°C melt lead-free tin/
silver/copper alloy to assemble these converters.
There are several lead-free solders suitable for your host pcb depending
on your SMT system and whatever local certification and environmental
regulations you must observe. Contact DATEL if you need specific advice.
Heat Shield
Careful thermocouple testing has shown that the interior of the DC/DC
under the heat shield is tens of degrees cooler than the outside ambient
temperature for typical reflow profiles. This protects internal components
and limits the amount of reflow where it is not desired. The heat shield also
includes marking for product identification and a date/lot code.
On LEN and HEN models, the heat shield is attached to the converter using
molded plastic pins on the heat shield interior which insert into recessed
dimples in the pinframe. An extra molded pin on the heat shield at the pin
1 location (and corresponding notch on the pcb) can only be installed one
way properly on the pinframe. If the shield accidentally comes loose, it may
be reinstalled by aligning the pins and dimples.
To remove the shield from the converter, after successful mounting and
cooling, squeeze the heat shield ears inward toward the converter body and
pull the shield upwards. Discard or recycle the shield. If you are using a flux
wash cycle, remove the heat shield before washing to avoid coming loose
inside the washer.
Single Output, Non Isolated, 12VIN, 0.8-5VOUT
Technical enquiries email: [e-mail], tel:
25 Amp, High di/dt DC/DC Converters
HEN D12 Models
MDC_HEN-D12.B01 Page 10 of 11
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