Aitech P221

MIL-STD-704A and D Input Compliance, 16 - 36 Volt DC Input Range

Manufacturer: Aitech
Aitech P221

Designed for harsh environment applications, the Aitech P221 is a versatile and reliable 6U VME power supply providing VME systems with an exceptionally wide input voltage range and all standard VME outputs and assures excellent load and line regulation.

The P221 input power voltage can vary from 16 Vdc to 36 Vdc, with a drop to 14 Vdc for up to 45 seconds, and fully complies MIL-STD 704A and D for 28 Vdc operation. For ultimate EMI reduction, an input line filter is used to reduce the input reflected ripple.

The power supply asserts four VME 64X compliant voltages, each featuring an extended hold-up time of 50 ms. The four outputs are provided by three DC-to-DC converters, with a total power rating of up to 175 W, and feature a minimum of 500 V isolation from input to output, thus eliminating any possibility of ground loops.

All outputs are individually protected against short-circuit and overvoltage. The power supply asserts all three VME 64x compliant control signals, namely SYSRST, SYSFAIL and ACFAIL. The 5 Vdc output carries sense lines for remote sensing.

The power supply provides temperature measurements and alarms, as well as DC fan output controlled by temperature. In addition, the P221 is equipped with a sophisticated BIT logic that monitors inputs and outputs, the temperatures, the fan status, and provides the VME and BIT status signals.

In addition, the P221 features four visible LEDs to show proper output voltages and an external ON/OFF signal for remote shutdowns.


Input16 - 36 Volt DC Input Range with Drop to 14 V for 45 Sec.
Output(s)5 V @ 30 A, ±12 V @ 1.0 A each, 3.3V @ 12 A
175 Watts Total Rated Power
OtherMIL-STD-704A and D Input Compliance
EMI/RFI Input Filter and Input Transient Protection
Output Over/Undervoltage and Short-Circuit Protections
~ACFAIL, ~SYSRST and ~SYSFAIL VME Output Signals
50 ms Hold-up Time
Input/Output and Chassis Isolation
Thermal Shutdown and Reverse Polarity Protection
External ON/OFF Control, DC Fan Output Drive and Control
Internal BIT Status and Alarms for Voltages, Currents, and Temperatures


ElectricalSee power specification
MechanicalConduction cooled
Conformal CoatingConformal coating on request
TemperatureSeries-200 Rugged
• Temperature range (operation): -40 to +71C
• Temperature range (storage): -50 to +100C

Series-400 Military
• Temperature range (operation): -55 to +85C
• Temperature range (storage): -62 to +125C

Ruggedisation level is determined in the part numbering scheme - refer to datasheet for further details
HumiditySeries-200 Rugged, Series-400 Military: 0-95% or 0 to 100% with coating
AltitudeSeries-200 Rugged, Series-400 Military: 70,000ft
VibrationSeries-200 Rugged
• Conduction-cooled: Random (g2/Hz): 20-2000Hz/0.1 g2/Hz
• Conduction-cooled: Sine (g PEAK): 50-500Hz/10g
• Air-Cooled: Random (g2/Hz): 20-2000Hz/0.04 g2/Hz
• Air-Cooled: Sine (g PEAK): 10-100Hz/2g

Series-400 Military
• Conduction-cooled: Random (g2/Hz): 20-2000Hz/0.1 g2/Hz
• Conduction-cooled: Sine (g PEAK): 50-500Hz/10g
• Air-Cooled: Random (g2/Hz): 20-2000Hz/0.04 g2/Hz
• Air-Cooled: Sine (g PEAK): 50-500Hz/5.5g
ShockSeries-200 Rugged: Conduction-cooled: 40g/11ms, 100g/6ms
Series-400 Military: Conduction-cooled: 40g/11ms, 100g/6ms
Warranty1 Year



BoardRefer to datasheet for ordering part number scheme
Recab UK
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