Antec True380S (Sonata) PSU

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Dec 17, 2002 -- by Mike Chin

Product Antec True 380S PSU (with Sonata case)
Manufacturer Antec Inc.
MSP To be announced; see text

The Antec True 380S is currently available only with the Antec Sonata case reviewed elsewhere on our web site. The new Sonata will be released to market in January 2003. The True 380S in this case is not the same as the TruePower 380 in that it has only one 80mm fan. The second 92mm fan common to the rest of the TruePower line has been omitted, and the intake air vents on the inside of the PSU have been doubled in area.

There is a reason for the 1-fan configuration: It is quieter than two. This approach is in line with the objective of the Sonata to form the basis of a noise-reduced PC. It is not clear whether this PSU will be available apart from the Sonata case. It shares many of the features of the TruePower line.

  • Dedicated, independent circuits for 3.3V, 5V, and 12V output lines.
  • Voltage feedback detection, and tighter ±3% voltage regulation.
  • Antec Low Noise Technology, similar to that employed by other quiet PSUs, which increases fan speed in an exponential curve so that low noise operation is maintained to middle power levels yet the full cooling power of the fan is brought on line when need at maximum power.
  • Fan-only output provides other fans in the PC with the same thermally controlled voltage received by the PSU, keeping fan noise to a minimum until cooling is really needed. This is a very useful feature for quiet computing, especially as the nominal voltage supplied stays at a low 5V all the way up to ~100W!
  • "Convenience" 4-pin Molex power output connector on external back panel for peripheral or convenience use, like the TrueControl 550.

There are seven 4-pin Molex connectors and two floppy drive power connectors on three sets of cables, the longest of which is 33" long. The main ATX cable has a mesh cover to keep it tidy, and P4 12V cable are on ~18" cables. There is also a fan RPM monitoring output that plugs into any 3-pin motherboard fan header.

Under the Hood

The heatsinks are bigger than those in the 2-fan Antec PSUs. Quite simply, there is more room because the 92mm fan is not protruding in. The exhaust fan has an Antec label; one assumes it is made by Dynaeon Industrial of Taiwan like most fans used by Antec. There are no vent holes on the cover.


Maximum Power

380 Watts


ATX Logic on-off additional power rocker switch (115/230 Volt selector switch)

Special Connectors

AUX Power
3-pin Fan Sensor
Fan Only

Transient Response

+5V,+12V outputs return to within 5% in less than 1ms for 20% load change.

P. G. Signal


Over Voltage Protection
recycle AC to reset

+5V trip point < +6.5V
+3.3V trip point < +4.1V
+12V trip point < +14.4V

Overload Protection

Latching Protection
+5V @ < 47A
+3.3V @ < 48A
+12V @ < 18A

Leakage Current

<3.5mA @ 240VAC








Max. Load







Min. Load







Load Reg.







Ripple V(p-p)







* +5V, +3.3V & +12V maximum output 360 Watts max.

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