Acromag QPCe7340 Puts Four VITA 93 QMC Sockets on a PCIe Carrier

Acromag's QPCe7340 Series carrier card puts four VITA 93 QMC mezzanine sockets on a three-quarter-length PCIe card with a x4 PCIe Gen 3 interface, giving developers a lab platform for I/O configurations that can later migrate unchanged to custom rugged carriers. The card serves designs built on VITA 93, the small-form-factor mezzanine standard aimed at defense platforms such as drones and at industrial robots.

What is VITA 93 QMC?

VITA 93 QMC defines a small-form-factor mezzanine module for rugged and industrial applications. The standard specifies Samtec connectors and standard thermal support, and its standard heatsink configuration allows modules to drop into both conduction-cooled and convection-cooled systems. That combination of a rugged connector design, defined cooling, and bandwidth is what separates the standard from other small-form-factor modules such as M.2 and Mini-PCIe, which lack all three, according to the vendor's positioning of the format.

Larger QMC formats trade board area for capability. The standard defines four module formats, and the larger ones deliver more I/O connections and throughput while physically accommodating larger chips such as AI accelerators or FPGAs.

How does the carrier card handle multiple modules?

The QPCe7340 organizes its four sockets in a 3-slot and 1-slot arrangement. The card supports four configurations:

• four single modules
• one double plus two single modules
• one triple plus one single module
• one double module configuration (per the vendor's supported combinations)

I/O from each slot reaches the outside world through back-panel connectors, so the carrier works as a complete bench interface system rather than a bare evaluation board. An on-board FPGA provides individual timing support to each socket, which matters for applications where multiple I/O modules must run on independent clocks or trigger schemes. FPGA and QMC debugging runs through a standard 14-pin JTAG programming header, and optical isolation is available on two of the slots.

What performance do the QMC modules deliver?

Acromag builds its module line on measured converter specifications. The digital I/O modules carry 32 isolated channels or bipolar solid-state relays that handle AC or DC signals. The analog module maintains 20 channels into a 16-bit ADC sampling at 1 MHz.

The multifunction module combines several converter blocks:

• eight channels through a 16-bit ADC with a 1.264-µs conversion time, equivalent to 791 kHz
• a 1,026-sample FIFO buffer on the ADC path
• a four-channel 16-bit DAC with a 7.5-µs output settling time
• 16 input/output channels with TTL-compatible thresholds
• a 32-bit counter/timer for tasks such as waveform generation and quadrature position measurement

Each channel on the multifunction module is individually configurable, which lets one board serve mixed acquisition and control duties in a single slot.

These figures are vendor datasheet values; the source material does not state independent bench test conditions, so buyers designing to tight accuracy budgets should confirm them against Acromag's calibration documentation.

Why does the lab-to-deployment path matter?

The modular approach separates design iteration from deployment hardware. An engineer can prototype and test a configuration on the PCIe carrier in the lab, then deploy the identical set of modules on a custom carrier board built for the target environment. That migration path avoids re-qualifying the I/O electronics when only the host interface changes, a meaningful cost consideration in defense programs where conduction-cooled custom carriers are the norm.

The development raises a practical adoption question for rugged-system architects: whether VITA 93's defined thermal and connector infrastructure, combined with carrier cards like the QPCe7340, will displace the ad hoc M.2 and Mini-PCIe integration work that many current drone and industrial-robot designs still rely on.