Specifications

PCIe/104 and PCI/104-Express Specification Revision 3.0 February 17, 2015 Page 40
5. ELECTRICAL SPECIFICATION
5.1. Power and Ground
5.1.1 Connector A, PCIe/104, Power Capabilities
The power rails on Connector A are +5V_SB, +3.3V, +5V, and +12V. The +5V and +12V are carried on central
conductor planes which are dispersed among the three banks of Connector A. The +5V_SB is carried on individual pins.
The current carrying capacities of the central panes and pins are shown in Table 5-1 below. Current values include a 20%
industry standard de-rating factor at 85 °C. Note that at lower temperatures the current carrying capacities increase.
There is a 2.9 to 1 ratio of current ground to current voltages which helps ensure good current paths.
Table 5-1 Connector A Power Delivery (OneBank Option)
Voltage
Minimum
Voltage (V)
Maximum
Voltage (V)
Number of
Pins
Current per Pin
(A)
Total Current (A) Total Power (W)
+3.3V 3.00 3.60 2 (2) 1.8 3.6 (3.6) 11.9 (11.9)
+5V 4.75 5.25 2 (1) planes 8.4 16.8 (8.4) 84.0 (42.0)
+12V 11.40 12.60 1 (0) plane 8.4 8.4 (0.0) 100.8 (0.0)
+5V_SB 4.75 5.25 2 (2) 1.8 3.6 (3.6) 18.0 (18.0)
GND n/a n/a 46 (10) 1.8 82.8 (18.0) n/a
Standby power is supplied for wake capabilities. Because of the limited amount of power available during standby, it is
important for Device cards to be designed to minimize power consumption from the standby rail. Note that during full
power operation, the voltage on the Standby rail may exceed the voltage on the +5V rail. Therefore, if powering devices
from both the standby and the +5V rail, care must be taken not to exceed the current limits of the Standby rail during
normal operation. The +12V rail is intended to provide additional power for high power devices
5.1.2 Connector B, PCI-104, Power Capabilities
Table 5-2 Connector B Power Delivery
Voltage
Minimum
Voltage (V)
Maximum
Voltage (V)
Number of
Pins
Current per Pin
(A)
Total Current (A) Total Power (W)
+3.3V 3.00 3.60 10 1.0 10.0 33.0
+5V 4.75 5.25 8 1.0 8.0 40.0
+12V 11.4 12.6 1 1.0 1.0 12.0
-12V -12.6 -11.4 1 1.0 1.0 12.0
GND n/a n/a 23 1.0 23.0 n/a