AERO MS27484T14F35SB

The AERO MS27484T14F35SB is a Shell Size 14, MIL-DTL-38999 Series II RFI grounding straight plug with insert 14-35, 37 size #20 crimp socket contacts, and polarizing position F-B. The B keying sub-variant physically prevents mating with adjacent F-A keyed receptacles of the same shell size and insert arrangement — the critical differentiator for system integrators deploying multiple identical-footprint connectors in a single avionics panel or satellite equipment bay. Like all MS27484-family connectors, the integral grounding spring delivers 360° cable shield bonding at the connector interface, achieving 45dB EMI attenuation from 100MHz to 10GHz without a separate backshell shield clamp.

For comparison with related MIL-DTL-38999 Series II connectors in our inventory:

Military-Grade Reliability & Performance

Built to MIL-DTL-38999 Revision N under Aero-Electric’s AS9100:2016-certified manufacturing program, the MS27484T14F35SB passes the full Series II qualification suite: 500-hour salt spray, thermal shock from −65°C to +175°C, mechanical shock and random vibration per MIL-STD-810, and 1,500 VRMS dielectric withstanding voltage. The RFI grounding spring finger array creates a consistent low-impedance shell-to-shell ground bond at every mating cycle, which is particularly valuable in systems where cable assembly technicians may not reliably perform backshell shield grounding during field reconnection. The B keying master key is positioned at a fixed angular offset from the A variant, standardized across all QPL-qualified manufacturers, ensuring that SB-keyed plugs sourced from Aero-Electric, Amphenol, TE Connectivity, or Souriau are interchangeable at the system level.

Supply Chain & Quality Assurance

The MS27484T14F35SB is manufactured by Aero-Electric Connector, Inc. (Conesys), a QPL-qualified, AS9100:2016-certified connector manufacturer. Full cross-source compatibility with Amphenol Aerospace (JTG06R equivalent, keying B), TE Connectivity Deutsch, Souriau, ITT Cannon, and Glenair ensures supply chain flexibility for multi-year defense and satellite programs. Every shipment includes certificates of conformance, lot traveler records, and incoming inspection documentation. Inventory is stored in ESD-compliant and MSL-rated packaging with full date code traceability per AS6081 counterfeit avoidance requirements.

Selection Guide & Application Notes

The MS27484T14F35SB is specified wherever the MS27484T14F35SA is also present in the same harness zone and circuit segregation requires hardware-enforced mis-mate protection. Mating receptacles must be keyed to position F-B — compatible types include MS27472T14F35PB (front wall mount), MS27497T14F35PB (jam nut), and equivalents from all QPL manufacturers. Note that the B-keyed plug cannot mate with any A-keyed, C-keyed, or N-keyed receptacle of the same shell size, even under applied force — this is by design. Specify the pin-contact variant MS27484T14F35PB when the mating receptacle loads socket contacts. A SAE-AS85049 backshell is mandatory for all cable terminations; an EMI backshell with 360° shield clamp supplements the integral grounding spring for maximum low-frequency shielding performance.

FAQ

What is the only difference between MS27484T14F35SB and MS27484T14F35SA?

Solely the keying sub-variant — B versus A. All electrical parameters (37 contacts, #20 size, socket type, 45dB EMI shielding), environmental ratings (−65°C to +175°C, IP67, 500-hr salt spray), and mechanical specifications are identical. The B keying positions the master key at a different angular offset, preventing the SB plug from mating with any SA-keyed receptacle.

When should I specify the B keying instead of A?

Specify B when the same connector type (MS27484T14F35S) appears more than once in the same panel zone and circuit segregation is required. The A/B keying pair is the standard approach for protecting adjacent identical-footprint connectors — such as primary and redundant avionics channels, or signal and power circuits — against cross-connection during maintenance and AIT operations.

Can an MS27484T14F35SB mate with an MS27472T14F35SA receptacle?

No. The B-keyed plug physically cannot engage with an A-keyed receptacle of any type. The master key and keyway are mechanically incompatible between different sub-variants, regardless of applied force. This is an intentional design feature of the MIL-DTL-38999 keying system.

What does the integral RFI grounding spring add over the standard MS27473 plug?

The grounding spring creates a 360° low-impedance bond between the cable shield and connector shell at the mating interface, providing 45dB EMI attenuation from 100MHz to 10GHz. The MS27473 (standard plug) has no grounding spring, leaving cable shield continuity entirely dependent on the backshell termination — which may be inconsistently applied in field maintenance.

What backshell is required and does the grounding spring replace it?

A SAE-AS85049 strain relief backshell is mandatory regardless of the grounding spring. The spring addresses high-frequency EMI at the connector interface; the backshell provides mechanical strain relief and low-frequency shield termination. For severe EMI environments below 100MHz, supplement with an EMI backshell with a dedicated 360° cable shield clamp.

Which receptacles are compatible with the MS27484T14F35SB?

Any MIL-DTL-38999 Series II receptacle in Shell Size 14, insert 35, keying position F-B — including MS27472T14F35PB (front wall mount), MS27497T14F35PB (jam nut), and equivalents from Amphenol, Souriau, TE Connectivity, Glenair, and ITT Cannon.

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