• –55°C to +85°C operation
• 19 to 36 VDC input or
16 to 36 VDC input typical
• Fully isolated
• Magnetic feedback
• Fixed frequency, 375 kHz typical
• Topology – Single Ended Forward
• 50 V for 50 ms transient protection
• Inhibit function
• Output trim
• Indefinite short circuit protection
• Radiation hardened to
neutrons/sq cm neutron fluence
rads(Si)/sec dose rate
rads(Si) total dose
• Meets MIL-STD-704E emergency
operation and transient standards
+5 & ±12
+5 & ±15
Size (max.): Non-flanged, case F3
1.950 x 1.350 x 0.455 inches (49.53 x 34.29 x 11.56 mm)
Flanged, case J3
2.720 x 1.350 x 0.455 inches (69.09 x 34.29 x 11.56 mm)
See Section B8, cases F3 and J3, for dimensions.
50 grams typical
Screening: Standard or ES. See Section C2 for screening options and Section
A5 for ordering information.
The MRH Series™ of DC/DC converters offers up to 15 watts of
power in a radiation hardened design. The low profile MRH
converters are manufactured in Interpoint’s fully certified and quali-
fied MIL-STD-1772 production facility and packaged in hermetically
sealed steel cases. They are ideal for use in programs requiring
high reliability, small size, and high levels of radiation hardening.
The MRH converters are switching regulators which use a quasi-
square wave, single ended forward converter design with a nominal
switching frequency of 375 kHz, typical. Close regulation (main
output line regulation is 0.05%) is maintained with advanced
constant frequency pulse width modulation design techniques.
With a 16 to 36 VDC input range and triple outputs of +5 VDC and
either ±12 or ±15 VDC, MRH converters are suitable for a wide
range of airborne, naval, and ground based applications. The
MRH’s feed-forward compensation topology provides high levels
(50 dB nominal) of input-to-output ripple rejection.
The MRH converters provide full power operation from –55°C to
+85°C with derated operation to +125°C. Flanged and non-flanged
package configurations are available with optional environmental
The MRH Series incorporates an inhibit terminal that can be used
to disable internal switching. The converter is inhibited when a logic
low (≤ 0.8 V) signal is applied to the TTL open collector compatible
inhibit pin. In the inhibit mode the inhibit pin current requirement is
less than –2 mA. The converter resumes normal operation when a
logic high (≥ 2.4 V) signal or open circuit is applied to the inhibit pin.
The open circuit voltage of the inhibit is 5 to 6 volts.
The output voltage on single output models can be trimmed upward
by as much as 5% of nominal by connecting a resistor between pin
3 and 4.
The MRH DC/DC converters are designed to provide continuous
normal operation through radiation levels associated with proximity
to thermonuclear events. The converters will operate normally in
environments with up to 10
neutrons per square centimeter
neutron fluence, 10
rads (Si) per second dose rate, and 10
(Si) total dose. These levels of radiation tolerance make the MRH
converters suitable for electronics in tactical programs where oper-
ation in high radiation environments is required.
At the highest dose rating (10
rads (Si)/sec dose rate) there will
be an upset resulting in a dip in the voltage. This is non-destructive
to the unit. The converter will operate through the upset.
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