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Home Products Connectors, Interconnects Circular Connectors~~D38999/26FE6SN-UWSB3~~

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D38999/26FE6SN-UWSB3 - Amphenol Aerospace Operations

Manufacturer Part Number: D38999/26FE6SN-UWSB3

Manufacturer: Amphenol Aerospace Operations

Allelco Part Number: 98D-D38999/26FE6SN-UWSB3

Warranty: 1 Year Allelco Warranty - Find out more

Stock Status:: 33,613 pcs available, New & Original

Parts Description: CONN PLUG FMALE 6POS GOLD CRIMP

Package: Bulk

Data sheet: -

RoHs Status: ROHS3 Compliant

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In stock: 33613

Unit Price: $1.00
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Specifications

D38999/26FE6SN-UWSB3 Tech Specifications
Amphenol Aerospace Operations - D38999/26FE6SN-UWSB3 technical specifications, attributes, parameters and parts with similar specifications to Amphenol Aerospace Operations - D38999/26FE6SN-UWSB3

Product Attribute	Attribute Value
Manufacturer	Amphenol Aerospace Operations
Voltage Rating	-
Termination	Crimp
Shielding	Shielded
Shell Size, MIL	E
Shell Size - Insert	17-6
Shell Material	Aluminum
Shell Finish	Electroless Nickel
Series	Military, MIL-DTL-38999 Series III, Tri-Start™ TV
Primary Material	Metal
Package	Bulk
Orientation	N (Normal)
Operating Temperature	-65°C ~ 200°C
Number of Positions	6
Mounting Type	Free Hanging (In-Line)
Mounting Feature	-

Product Attribute	Attribute Value
Material Flammability Rating	-
Insert Material	-
Ingress Protection	Environment Resistant
Features	Backshell, Coupling Nut, Self Locking, Shielding Device, Shrink Boot
Fastening Type	Threaded
Current Rating (Amps)	-
Contact Material	Copper Alloy
Contact Finish Thickness - Mating	50.0µin (1.27µm)
Contact Finish - Mating	Gold
Connector Type	Plug, Female Sockets
Color	Silver
Cable Opening	-
Base Product Number	D38999/26FE
Backshell Material, Plating	Metal
Applications	Aviation, Marine, Military

Environmental & Export Classifications

ATTRIBUTE	DESCRIPTION
RoHs Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
ECCN	EAR99
HTSUS	8536.69.4020

Frequently Asked Questions(FAQ)

What makes the D38999/26FE6SN-UWSB3 suitable for aerospace applications where environmental exposure is a concern?: The D38999/26FE6SN-UWSB3 combines electroless nickel shell plating with gold-plated mating contacts (50.0µin thickness) and a shielded design, creating a multi-layer corrosion barrier critical for aviation and marine environments. The aluminum shell with electroless nickel finish resists salt spray and moisture ingress without the brittleness issues associated with some hard-anodized alternatives. The connector's environment-resistant ingress protection rating, coupled with its operating temperature range of -65°C to 200°C, allows deployment in both high-altitude cold exposure and engine compartment thermal stress without contact degradation.

How does the D38999/26FE6SN-UWSB3 compare to standard commercial circular connectors for military avionics harnesses?: The D38999/26FE6SN-UWSB3 is certified to MIL-DTL-38999 Series III specifications, meaning it meets mandatory military screening, vibration, and altitude testing requirements that commercial connectors bypass entirely. The Tri-Start™ TV mating feature ensures precise bayonet engagement even after repeated connect-disconnect cycles in vibration-prone environments. Unlike consumer-grade alternatives, the D38999/26FE6SN-UWSB3 provides documented traceability, lot-level quality records, and compliance with defense supply chain auditing—essential for retrofit or service bulletins where component provenance cannot be questioned.

Why is the 6-position, size 17-6 shell configuration of the D38999/26FE6SN-UWSB3 chosen for specific aircraft power distribution applications?: The D38999/26FE6SN-UWSB3's 6-position layout in shell size E (MIL designation 17-6) balances current capacity per pin against overall connector footprint—a critical trade-off in aircraft where panel real estate is limited. Six positions allow dual-redundancy power feeds plus shield and sense returns within a compact, threaded-coupling package that resists accidental disconnection during in-flight vibration. This configuration avoids the larger size 20 or 24 connectors while maintaining sufficient conductor cross-section for 28 VDC or 115 VAC aircraft bus applications without exceeding thermal limits.

What is the functional difference between the crimp termination of the D38999/26FE6SN-UWSB3 and solder-contact alternatives in harsh vibration environments?: Crimp termination on the D38999/26FE6SN-UWSB3 creates a cold-weld bond that distributes mechanical stress across a wider conductor cross-section, reducing stress concentration compared to solder connections. In aircraft experiencing sustained vibration (typically 5–20 Hz in fuselage; 50+ Hz in engine compartments), crimped contacts experience lower fatigue crack initiation rates because the connection lacks the brittle intermetallic layer that solder joints develop. The D38999/26FE6SN-UWSB3's copper-alloy contacts with crimp termination also accommodate thermal cycling without the re-flow risk inherent in solder, maintaining contact pressure across the full -65°C to 200°C operating envelope.

How does the shielded design of the D38999/26FE6SN-UWSB3 affect EMI/RFI immunity in modern avionics systems?: The D38999/26FE6SN-UWSB3 incorporates a shielding device integrated into the coupling nut and backshell assembly, creating a Faraday-cage effect that attenuates radiated emissions at the connector interface. This is particularly effective for signals in the VHF/UHF range (30 MHz–1 GHz) common to aircraft communication and navigation systems. The shielded design of the D38999/26FE6SN-UWSB3 also prevents low-level analog sensor signals from coupling noise from adjacent high-current power harnesses—a common failure mode in unshielded connectors where intermittent avionics faults are difficult to diagnose.

What does the self-locking coupling mechanism on the D38999/26FE6SN-UWSB3 accomplish in terms of installation safety and maintenance?: The self-locking threaded fastening on the D38999/26FE6SN-UWSB3 uses a bayonet-and-turn engagement pattern that prevents accidental uncoupling under vibration without requiring separate safety wire or secondary locking devices. This eliminates a common maintenance error in military aircraft where improperly safetied connectors separate in flight. The D38999/26FE6SN-UWSB3's built-in locking feature also reduces turnaround time during depot-level maintenance, as technicians need not apply separate torque-verification seals or document safety-wire installation.

Why is MSL 1 (Unlimited) moisture sensitivity important for the D38999/26FE6SN-UWSB3 in long-term storage and field deployment?: MSL 1 designation on the D38999/26FE6SN-UWSB3 means the connector requires no desiccant packaging, humidity-controlled storage, or time-limited shelf life—a significant logistical advantage for military and marine applications where inventory may sit in non-climate-controlled depots for years. Unlike higher-MSL components that absorb moisture and risk reflow cracking during solder operations, the D38999/26FE6SN-UWSB3 can be procured in bulk, stored at ambient conditions, and deployed without pre-bake procedures. This reduces supply-chain complexity and total cost of ownership, particularly for forward-deployed or remote installations where climate control is unavailable.

How does the D38999/26FE6SN-UWSB3's gold contact plating thickness of 50.0µin affect long-term contact resistance and corrosion behavior?: The 50.0µin (1.27µm) gold plating on the D38999/26FE6SN-UWSB3 provides sufficient thickness to withstand approximately 50–100 mating cycles before base-metal contact exposure becomes risk, and maintains a low contact resistance (<50 mΩ per contact pair) across the full temperature range when properly mated. This thickness is intentionally conservative for aerospace applications where replacement cycles are infrequent but environmental corrosion risk is high. Thinner platings (10–20µm) would offer marginal cost savings but accelerate galvanic corrosion in salt-spray environments, particularly in the D38999/26FE6SN-UWSB3's interconnect pockets where moisture can concentrate.

What are the practical design considerations when integrating the D38999/26FE6SN-UWSB3 into a retrofit harness for older military aircraft?: When retrofitting with the D38999/26FE6SN-UWSB3, compatibility with existing in-service connector shells (typically earlier-generation MIL-DTL-38999 Series I or II) must be verified via published compatibility matrices, as the Tri-Start™ TV mating feature on the D38999/26FE6SN-UWSB3 may not physically engage older bayonet patterns. The connector's electroless nickel finish may also react differently than original anodized shells when exposed to dissimilar-metal couples in high-humidity environments, requiring isolation washers or conformal coating. Documentation and spare-parts logistics must account for the D38999/26FE6SN-UWSB3 as a distinct line item to prevent field mix-ups with non-interchangeable predecessor connectors.

How should the D38999/26FE6SN-UWSB3 backshell and shrink-boot assembly be specified to ensure proper strain relief and IP protection in shipboard or marine applications?: The D38999/26FE6SN-UWSB3's integral backshell provides mechanical strain relief and environmental sealing, but marine applications require careful specification of backshell material (typically plated steel or aluminum) and shrink-boot durability (elastomer type and UV resistance). In salt-spray environments, the backshell plating must match or exceed the shell nickel finish to prevent galvanic attack at dissimilar-metal interfaces. For subsurface or wet-deck installations, the D38999/26FE6SN-UWSB3 shrink boot should be specified with high-durometer elastomer (typically 70–90 Shore A) to resist ozone degradation and salt-fog penetration, adding 15–25% to component cost but reducing field failure risk by an order of magnitude.

Does the D38999/26FE6SN-UWSB3 meet current RoHS3 compliance requirements for defense prime contractors, and what are the implications for supply-chain sourcing?: The D38999/26FE6SN-UWSB3 is RoHS3 Compliant, meaning it contains no lead, cadmium, hexavalent chromium, or other restricted substances listed under EU Directive 2011/65/EU. For U.S. defense contractors, this certification simplifies export documentation and reduces regulatory risk when the connector is used in international military programs or dual-use applications. However, RoHS3 compliance on the D38999/26FE6SN-UWSB3 does not automatically exempt it from ITAR (International Traffic in Arms Regulations) restrictions, as the connector's MIL-DTL-38999 Series III designation remains subject to export control. Procurement must verify ECCN classification (the D38999/26FE6SN-UWSB3 is EAR99, lower-risk) but cannot assume unrestricted international availability.

In what way does the free-hanging (in-line) mounting of the D38999/26FE6SN-UWSB3 differ from panel-mount alternatives, and how does this affect harness design?: The D38999/26FE6SN-UWSB3's free-hanging configuration means the connector body is not constrained by a panel bulkhead, requiring the backshell and strain relief to support the full weight of the mated cable harness. This design is preferred in aircraft where panel-mounted connectors would create stress concentrations at the bulkhead interface during vibration or sudden aircraft maneuvers. The free-hanging geometry of the D38999/26FE6SN-UWSB3 also allows the harness to flex and route through confined cable trays without sharp bends that would crack panel-mount connector shells. However, the design demands robust cable clamps and support brackets downstream to prevent the harness weight from translating into repetitive bending stress at the D38999/26FE6SN-UWSB3 termination interface.

How should the D38999/26FE6SN-UWSB3 be tested and inspected during incoming quality control to verify compliance with MIL-DTL-38999 requirements?: Incoming inspection of the D38999/26FE6SN-UWSB3 should include visual examination under magnification (10×) for proper plating coverage, contact alignment, and backshell attachment integrity. Functional testing requires mating cycles with a calibrated force gauge to verify the Tri-Start™ TV engagement torque (typically 8–15 in-lbs) and contact resistance measurement (<50 mΩ per pair at rated current). For high-reliability applications, the D38999/26FE6SN-UWSB3 should undergo salt-fog testing (ASTM B117, 96 hours) on a representative lot sample before production release, particularly if the connector is destined for coastal or marine environments where accelerated corrosion is probable. Documentation of plating thickness (50.0µin ±10%) and shell/backshell material certification completes the incoming quality verification for the D38999/26FE6SN-UWSB3.

Parts with Similar Specifications

The three parts on the right have similar specifications to Amphenol Aerospace Operations D38999/26FE6SN-UWSB3

Product Attribute
Part Number	D38999/26FE6SN-URSB3	D38999/26FE6SN-USBSB2	D38999/26FE6SN-U	D38999/26FE6SN-LC
Manufacturer	Amphenol Aerospace Operations	Amphenol Aerospace Operations	Amphenol Aerospace Operations	Glenair
Shell Size, MIL	-	-	-	-
Shell Size - Insert	-	-	-	-
Mounting Feature	-	-	-	-
Number of Positions	-	-	-	-
Contact Finish - Mating	-	-	-	-
Base Product Number	-	DAC34H84	MAX500	ADS62P42
Contact Material	-	-	-	-
Connector Type	-	-	-	-
Cable Opening	-	-	-	-
Termination	-	-	-	-
Features	-	-	-	Simultaneous Sampling
Package	-	Tape & Reel (TR)	Tube	Tape & Reel (TR)
Ingress Protection	-	-	-	-
Shielding	-	-	-	-
Insert Material	-	-	-	-
Series	-	-	-	-
Contact Finish Thickness - Mating	-	-	-	-
Mounting Type	-	Surface Mount	Through Hole	Surface Mount
Voltage Rating	-	-	-	-
Applications	-	-	-	-
Fastening Type	-	-	-	-
Material Flammability Rating	-	-	-	-
Color	-	-	-	-
Operating Temperature	-	-40°C ~ 85°C	0°C ~ 70°C	-40°C ~ 85°C
Shell Material	-	-	-	-
Primary Material	-	-	-	-
Current Rating (Amps)	-	-	-	-
Shell Finish	-	-	-	-
Orientation	-	-	-	-
Backshell Material, Plating	-	-	-	-

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America	Brazil	7
Europe	Germany	5
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Oceania	Australia	6
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