Manufacturer: Tri-M Technologies

The HESC-SERD is a high efficiency, high-performance DC to DC 60 watt embedded power supply that supplies +5V, -5V, +12V & -12V outputs. The HESC-SERD also includes a flash-based microcontroller that supplies advanced power management, smart battery charger and an RS232 serial port. The HESC-SERD is designed for low noise embedded computer systems, has a wide input range of 6-50V(>8:1) and is ideal for battery or unregulated input applications. The HESC-SERD is specifically designed for vehicular applications and has heavy-duty transient suppressors (9000W) that clamp the main input voltage to safe levels while maintaining normal power supply operation.

The HESC-SERD is a state-of-the-art Mosfet based design that provides outstanding line and load regulation with efficiencies up to 95 percent. Organic Semiconductor Capacitors provide filtering that reduces ripple noises below 20mV. The low noise design makes the HESC-SERD ideal for use aboard aircraft or military applications or wherever EMI or RFI must be minimized. The +5VDC and +12VDC outputs are controlled by a constant off-time current-mode architecture regulator that provides excellent line and load transient response.

The HESC-SERD provides up to four stages of battery charging and can charge Lead-Acid, NiCd, and NiMh batteries and is also SMBus level 3 compatible. Charge currents are up to 4A, and battery charging voltages from 9.5 to 35V.

The HESC-SERD has advanced power management functions that allow timed on/off control of the HESC-SERD, notification of changes to main power and changes in the battery status. For example, the HESC-SERD can be programmed to power off the outputs in 60 seconds, and then turn on again 12 hours later.

The HESC-SERD size is 3.55 x 3.775 inches, which is the same size as the PC/104 standard and has the same mounting holes pattern as the PC/104 standard. However, the HESC-SERD does not supply the PC/104 bus connectors. (For a fully compliant PC/104 embedded power supply, please see Tri-M's HESC104.) All generated voltages are provided to a removable pluggable header. The removable plug allows the HESC-SERD to be easily installed. The RS232 serial port is provided on a 2x5 row pin header.

The HESC-SERD can be configured to meet almost any power supply and battery charging need for embedded applications, whether that be a simple +5V application, or providing power for backlighted LCD panels, or a full UPS (uninterruptible power supply configuration).


  • High efficiency
  • Extended temperature operation
  • Rugged design
  • Transient suppression
  • Power/OS
  • Smart charging
  • PC104 size


Input6V to 50V DC
Output(s)+5V output* 12.0A
+12V output 2.5A
-5 output 0.4A
-12V output 0.5A

Peak to Peak ripple* <20mV
Load Regulation** <60mV
Line Regulation** 40mV
Output Temp. Drift** <40mV
Output Ripple** 20mV
Quiescent Current*** 2mA
Soft Start: 5V start up risetime = 10 msec
EfficiencyUp to 95%
BatteryCharge Current 0A to 4.0 A
Charging Voltage 10V to 35V
OtherOpto-isolated on/off input (SD), allowing for remote control


ExpansionHESC-SERD does not have any bus interfaces
Electrical6V to 50V DC - see above for more details
MechanicalDimensions: 90mm x 96mm (3.55" x 3.775"), standard PC/104 sized
Conformal CoatingOn request
TemperatureTemperature range (operation): -40°C to +85°C
Temperature range (storage): -40°C to +85°C
Weight7.30oz / 206.95g
MTBF127,189 hours (14.5 years)
Warranty1 Year



PC/104 size, In 6-50VDC, Out 60 watt, +5V, + 12V, -5V, -12V, -40 to +85C, Smart Charging, Serial Interface, wide input range +6VDC~+50VDC, (-40 to +85°C)
-CH Add suffix for Humiseal conformal coating and epoxy (factory installed)
-CS Add suffix for Silicon conformal coating and epoxy (factory installed)
-CU Add suffix for Urethane conformal coating and epoxy (factory installed)
Recab UK
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