AERO MS27508E20F16PB
- 16-position male receptacle connector with box mount configuration
- Complies with MIL-DTL-38999 Series II military specifications
- Hermetically sealed construction for harsh environment operation
- Crimp termination for reliable wire connections
- Shell size 20-16 with quick-disconnect bayonet coupling
In the demanding world of aerospace and defense, every component must deliver uncompromising reliability. The AERO MS27508E20F16PB connector is engineered to meet this challenge, providing robust electrical connections for avionics systems, satellite platforms, and ground defense equipment. Built to the rigorous standards of MIL-DTL-38999 Series II, this connector ensures consistent performance in environments where vibration, temperature extremes, and moisture are constant threats.
This 16-position receptacle features a box mount design that simplifies integration into complex electronic systems. Its hermetic sealing provides protection against dust, moisture, and other contaminants, making it suitable for both airborne and spaceborne applications. The crimp termination method ensures excellent electrical continuity while allowing for efficient installation and maintenance operations.
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The AERO MS27508E20F16PB is a Shell Size 20, MIL-DTL-38999 Series II rear panel box mount receptacle with insert 20-16, 16 size #20 crimp pin contacts, and polarizing position F-B. Its defining characteristic is the absence of rear accessory threads: unlike the front box mount MS27499E14F35PB which accepts a backshell on its rear, the MS27508 presents a flat rear profile that minimizes the depth occupied behind the panel face — the critical design advantage when PCBs, heat sinks, or structural frames constrain the available space immediately inside the enclosure wall. The four-hole square flange mounts from the rear of the panel, and the front face presents a standard Series II bayonet interface compatible with all MIL-DTL-38999 Series II plugs.
Why the MS27508 When the MS27499 Exists?
The two receptacle types serve distinct mechanical scenarios. The MS27499 (front box mount) is installed from outside the enclosure — the flange faces outward, backshell threads on the rear allow strain relief accessories to be fitted, and the harness is fully manageable from the exterior. The MS27508 (rear box mount) is installed from inside the enclosure — the flange faces inward against the panel, the wire termination sits flush against the rear, and the low-profile shell delivers the minimum possible projection inside the equipment bay. System integrators specify the MS27508 when internal PCB spacing or component clearance prohibits the rear protrusion a backshell would require, or when the enclosure design mandates internal-access-only connector installation during assembly.
Technical Specifications and Supply Chain
With Shell Size 20 and a 16-contact insert, the MS27508E20F16PB supports mixed-function signal harnesses where the lower contact count of insert 20-16 is sufficient — making it lighter and more compact than larger insert alternatives while maintaining the standard Series II environmental qualification: 500-hour salt spray per Class E (bright cadmium), IP67 sealing, −65°C to +175°C, and 45dB EMI attenuation from 100MHz to 10GHz. Manufactured by Aero-Electric (Conesys) under AS9100:2016 and ISO 9001:2015 certification, the part is cross-sourceable from Amphenol Aerospace, TE Connectivity, Souriau, ITT Cannon, and Glenair. Every shipment includes certificates of conformance, lot traveler records, and incoming inspection documentation. No backshell is required or attachable; a protective dust cap is recommended when the receptacle is unmated.
FAQ
What is the key difference between MS27508 and MS27499?
The MS27508 is a rear panel box mount with no backshell accessory threads — designed for minimum depth behind the panel when installed from inside the enclosure. The MS27499 is a front box mount with backshell threads — designed for external installation with strain relief accessories. Both accept the same Series II bayonet plugs from the front face.
Does the MS27508E20F16PB accept a backshell?
No. The MS27508 low-profile rear design intentionally omits accessory threads. This is the feature that enables its ultra-compact depth behind the panel. A protective dust cap is recommended to protect pin contacts when the receptacle is unmated.
How many contacts does this connector support?
16 size #20 crimp pin contacts per insert arrangement 20-16. Size #20 contacts are compatible with AWG 20–24 wire, rated for 500 mating cycles per SAE-AS39029.
Which plugs mate with the MS27508E20F16PB?
Any MIL-DTL-38999 Series II plug in Shell Size 20, insert 16, polarizing position F-B — including MS27473T20F16SB (standard plug) and MS27484T20F16SB (RFI grounding plug) from any QPL-qualified manufacturer.
Why specify Shell Size 20 with insert 16 rather than a smaller shell with a higher-density insert?
Insert 20-16 provides 16 contacts in Shell Size 20, which yields a larger contact pitch and supports heavier wire gauges (AWG 16–20 range for power contacts in mixed arrangements) compared to high-density inserts in smaller shells. It is the appropriate choice when current-carrying capacity per circuit or wire gauge constraints rule out smaller #22-size contacts.
Is the F-B keying on the MS27508 compatible with F-B keyed plugs from other manufacturers?
Yes. The F-B keying angular offset is standardized in MIL-DTL-38999 and is identical across all QPL-qualified manufacturers. An F-B keyed plug from Amphenol, Souriau, TE Connectivity, or Glenair will mate with the MS27508E20F16PB and refuse to mate with any other keying variant.
