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HomeProductsConnectors, InterconnectsCircular Connectors - HousingsD38999/24SB2HN-LC
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D38999/24SB2HN-LC - Amphenol Aerospace Operations

Manufacturer Part Number
D38999/24SB2HN-LC
Manufacturer
Amphenol Aerospace Operations
Allelco Part Number
98D-D38999/24SB2HN-LC
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
30,140 pcs available, New & Original
Parts Description
CONN RCPT HSNG MALE 2POS PNL MT
Package
Data sheet
D38999/24SB2HN-.pdf
RoHs Status
Lead free / RoHS Compliant
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Our certification
In stock: 30140
  • Unit Price: $181.376
  • Subtotal: $0.00

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Quantity Unit Price Ext. Price
1+ $181.376 $181.38
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Specifications

D38999/24SB2HN-LC Tech Specifications
Amphenol Aerospace Operations - D38999/24SB2HN-LC technical specifications, attributes, parameters and parts with similar specifications to Amphenol Aerospace Operations - D38999/24SB2HN-LC

Product Attribute Attribute Value
Manufacturer Amphenol Aerospace Operations
Type For Male Pins
Shielding Shielded
Shell Size, MIL B
Shell Size - Insert 11-2
Shell Material Stainless Steel
Shell Finish Nickel
Series Military, MIL-DTL-38999 Series III, Tri-Start™ TV
Packaging Bulk
Other Names AAD38999/24SB2HN-LC
Orientation N (Normal)
Operating Temperature -65°C ~ 200°C
Number of Positions 2
Note Contacts Not Included
Mounting Type Panel Mount
Mounting Feature Bulkhead - Front Side Nut
Product Attribute Attribute Value
Material Flammability Rating -
Lead Free Status / RoHS Status Lead free / RoHS Compliant
Insert Material -
Ingress Protection -
Includes -
Housing Color Silver
Features Firewall Usage
Fastening Type Threaded
Detailed Description 2 Position Circular Connector Receptacle Housing Panel Mount Firewall Usage
Coupling Nut Material, Plating -
Coupling Nut Diameter -
Contact Type Crimp
Contact Size 16
Contact Shape Circular
Connector Type Receptacle Housing

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status Lead free / RoHS Compliant

Frequently Asked Questions(FAQ)

What are the key differences between the D38999/24SB2HN-LC and other D38999 Series III connectors for aerospace applications?
The D38999/24SB2HN-LC is configured as a 2-contact circular MIL-spec connector with #16 AWG wire capacity, designed for applications requiring compact form factor with reliable environmental sealing. Within the D38999 Series III family, variations exist in contact count, pin/socket configuration, and wire gauge ratings. The D38999/24SB2HN-LC's two-contact arrangement makes it suitable for paired signal or power distribution in space-constrained environments such as aircraft instrumentation, avionics subsystems, or remote sensor interfaces where redundancy or differential signaling is employed. The receptacle (RECP) configuration of the D38999/24SB2HN-LC indicates it is mated to a plug connector, establishing the mechanical interface in a specific installation orientation. Compared to higher-contact-count D38999 variants, the D38999/24SB2HN-LC reduces interconnect complexity and cost while maintaining full MIL-spec performance and environmental rating.
Is the D38999/24SB2HN-LC suitable for high-frequency signal transmission in avionics systems?
The D38999/24SB2HN-LC, as a two-contact MIL-spec circular connector rated for #16 AWG conductors, is engineered for reliable signal integrity in aerospace environments but is not optimized for high-frequency or RF applications requiring controlled impedance. The D38999/24SB2HN-LC's design prioritizes environmental sealing, vibration resistance, and thermal cycling stability rather than impedance-matched transmission line characteristics. For avionics applications involving precision analog signals (such as temperature sensors, pressure transducers, or discrete signal distribution), the D38999/24SB2HN-LC performs reliably within audio and low-frequency ranges. However, avionics systems requiring GHz-level RF transmission or precision differential signaling would benefit from specialized connectors offering controlled impedance and shielding topology, rather than the D38999/24SB2HN-LC's general-purpose architecture.
What environmental sealing and protection level does the D38999/24SB2HN-LC provide during aircraft operation?
The D38999/24SB2HN-LC, as a MIL-spec circular connector certified to aerospace standards, incorporates sealed environmental protection suitable for pressurized and unpressurized aircraft compartments. The connector's design withstands thermal cycling across wide temperature ranges, maintains contact reliability under vibration and mechanical shock typical of flight operations, and resists moisture ingress during ground storage and high-altitude exposure. The D38999/24SB2HN-LC's hermetic sealing characteristics protect against salt-fog corrosion, fungal growth, and rapid pressure transients. The receptacle configuration of the D38999/24SB2HN-LC ensures mating surfaces remain protected when disconnected, reducing contamination risk during maintenance or component replacement. While the D38999/24SB2HN-LC meets military environmental specifications, installation location (pressurized cabin, unpressurized avionics bay, external pylon-mounted equipment) affects exposure duration and maintenance intervals.
How does the #16 AWG wire gauge limitation of the D38999/24SB2HN-LC affect power distribution capability?
The D38999/24SB2HN-LC's #16 AWG contact rating establishes practical current-carrying capacity determined by conductor cross-sectional area, insulation material, and ambient thermal environment. A #16 AWG solid copper conductor nominally supports 10–13 amperes under continuous operation at 20°C ambient, with reduced ratings in enclosed or high-temperature installations. For the two-contact configuration of the D38999/24SB2HN-LC, total power distribution is limited to paired circuits, each operating within the #16 AWG ampacity envelope. The D38999/24SB2HN-LC is therefore suited for low-power signal distribution, discrete instrumentation circuits, or secondary power distribution requiring thermal margin. Applications demanding high-current power distribution (>15 amperes per contact) would require multi-contact D38999 Series III variants or specialized high-ampacity connectors. The D38999/24SB2HN-LC's two-contact, #16 AWG specification reflects its design role in low-power avionic sensor networks rather than primary power architecture.
Can the D38999/24SB2HN-LC be used interchangeably with commercial-grade circular connectors in aerospace applications?
The D38999/24SB2HN-LC is manufactured to MIL-DTL-38999 specification, requiring design verification, material traceability, manufacturing process control, and performance testing that exceed commercial connector standards. Commercial circular connectors typically lack equivalent environmental certification, vibration qualification, or documented performance under aerospace thermal and pressure cycling. Substituting a commercial connector for the D38999/24SB2HN-LC introduces undocumented risk: contact durability under thermal cycling may be unverified, plating composition may not meet corrosion specifications, and manufacturing lot-to-lot variation may exceed aerospace tolerances. Original Equipment Manufacturers (OEMs) and maintenance facilities must use MIL-spec qualified components such as the D38999/24SB2HN-LC to satisfy airworthiness certification, spare parts documentation, and liability requirements. The D38999/24SB2HN-LC's MIL-spec designation ensures compatibility with approved materials, manufacturing facilities, and quality control protocols specific to aerospace supply chains.
What is the mating cycle life specification for the D38999/24SB2HN-LC, and how does it compare to other MIL-spec connectors?
MIL-DTL-38999 connectors, including the D38999/24SB2HN-LC, are rated for a minimum of 500 mating cycles under controlled laboratory conditions, with contact resistance verified at initial assembly, mid-life (250 cycles), and end-of-life (500 cycles). The D38999/24SB2HN-LC's two-contact configuration exhibits relatively low wear progression because mechanical engagement forces are distributed across fewer contact pairs, reducing cumulative stress on individual contacts. Actual field mating cycles for the D38999/24SB2HN-LC depend on maintenance frequency, connector protection during storage, and mating force application technique. Avionics systems with regular maintenance intervals (every 500–1000 flight hours) may cycle the D38999/24SB2HN-LC only 20–50 times annually, suggesting useful life extending 10–25 years under normal operation. The D38999/24SB2HN-LC's mating cycle performance is comparable to other two-contact D38999 Series III variants; higher contact-count configurations may exhibit slightly shorter cycle life due to increased sliding wear across all contact pairs simultaneously.
How should the D38999/24SB2HN-LC be stored and handled to prevent degradation before installation?
The D38999/24SB2HN-LC should be stored in a controlled environment (15–25°C, 30–60% relative humidity) protected from condensation, salt spray, and corrosive chemical exposure. The connector's contacts are typically plated with materials vulnerable to moisture-induced oxidation and tarnishing; storing the D38999/24SB2HN-LC in sealed, desiccant-packed containers extends shelf life and preserves contact resistance. The D38999/24SB2HN-LC should not be stored in pressurized aircraft cabins, maintenance hangars with high humidity, or near salt-water environments without protective packaging. Mating force requirements for the D38999/24SB2HN-LC are calibrated during manufacturing; applying excessive insertion force or overtightening the coupling nut may damage internal contact springs or misalign contact pairs. Before installation, the D38999/24SB2HN-LC receptacle should be inspected for bent pins (if applicable to configuration), corrosion, or contamination; any debris should be removed using dry, compressed air rather than solvents that may compromise contact platings.
What RoHS compliance status does the D38999/24SB2HN-LC carry, and how does this affect aerospace supply chain qualification?
The D38999/24SB2HN-LC carries RoHS compliance (Restriction of Hazardous Substances, EU Directive 2011/65/EU and 2015/863/EU amendments), indicating absence of lead, cadmium, mercury, hexavalent chromium, and flame-retardant materials above specified thresholds. RoHS certification for the D38999/24SB2HN-LC does not contradict MIL-spec aerospace qualification; many aerospace manufacturers have transitioned to RoHS-compliant MIL-spec components to streamline global supply chains and reduce environmental liability. However, the D38999/24SB2HN-LC's RoHS status affects material compatibility downstream: lead-free solder used in printed circuit board assembly must be qualified with lead-free contact platings on the D38999/24SB2HN-LC to prevent tin whisker formation or brittle intermetallic joint degradation. OEMs integrating the D38999/24SB2HN-LC should verify that RoHS transition did not alter contact plating thickness or composition compared to legacy non-RoHS D38999 variants, as reduced plating thickness may reduce mating cycle life marginally.
How does the D38999/24SB2HN-LC perform in cryogenic or extreme-altitude aerospace environments?
The D38999/24SB2HN-LC's material selection—typically brass contacts, stainless steel shells, and polymer insulators—maintains mechanical and electrical properties across wide temperature ranges encountered in high-altitude and cryogenic environments. At 40,000+ feet altitude, ambient temperatures drop to –55°C or lower; the D38999/24SB2HN-LC's contact spring tension remains mechanically stable, and contact resistance does not degrade due to temperature-induced material embrittlement. The connector's polymer housing and elastomeric seals do not become brittle or crack under sustained cryogenic exposure. However, rapid thermal cycling—such as ground-level storage at 20°C followed by high-altitude exposure at –55°C—may cause differential expansion between the D38999/24SB2HN-LC's internal contacts and shell, potentially introducing microscopic gaps. The D38999/24SB2HN-LC's design accommodates thermal cycling through precision tolerances and compliant contact elements; MIL-spec testing validates performance after specified temperature transients. For extended cryogenic operation (hypersonic vehicles, upper-stage rocket guidance systems), the D38999/24SB2HN-LC should be integrated with thermally isolated connector enclosures or active heating elements to minimize thermal stress.
What is the contact resistance specification for the D38999/24SB2HN-LC, and how does it relate to signal fidelity in instrumentation circuits?
MIL-DTL-38999 circular connectors, including the D38999/24SB2HN-LC, specify maximum initial contact resistance of 0.005–0.015 ohms per contact pair, measured under defined mechanical load and electrical current. For the D38999/24SB2HN-LC's two-contact configuration operating at milliampere signal levels typical of aerospace sensors (thermocouples, pressure transducers, discrete logic signals), the contact resistance of 0.01 ohm represents negligible voltage drop (<1 millivolt at 100 mA), preserving signal fidelity. However, environmental cycling, thermal stress, and oxidation may degrade contact resistance to 0.02–0.05 ohm over the D38999/24SB2HN-LC's operational life; design margins should account for this gradual increase. Signal integrity circuits using the D38999/24SB2HN-LC should incorporate high-impedance input stages (>1 megaohm) to minimize loading effects and apply guarding or shielding if operating in high-noise environments. The D38999/24SB2HN-LC's contact resistance performance is adequate for analog instrumentation but insufficient for precision resistance measurement applications requiring sub-milliohm accuracy.
Are there timing or installation constraints when replacing a failed D38999/24SB2HN-LC on aircraft in maintenance?
Replacing a failed D38999/24SB2HN-LC in field maintenance requires coordination with aircraft maintenance documentation, electrical schematic verification, and functional testing protocols. The D38999/24SB2HN-LC's two-contact configuration means circuit integrity depends on correct polarity and wire routing during reconnection; reversed polarity or crossed connections may cause control system malfunction or sensor output inversion. Before disconnecting the D38999/24SB2HN-LC, technicians must isolate circuit power to prevent arcing or logic state corruption in digital avionics. After installing the replacement D38999/24SB2HN-LC, contact resistance should be measured to verify proper seating; if resistance exceeds 0.02 ohm, the connector may not be fully mated or contacts may be contaminated. Aircraft maintenance schedules often allow 2–4 hours for connector replacement including functional testing; installing the D38999/24SB2HN-LC during unscheduled maintenance may delay aircraft return to service. Maintenance planning should stock qualified replacement D38999/24SB2HN-LC units with full traceability documentation to accelerate repair cycles.
What connector mating orientation conventions apply to the D38999/24SB2HN-LC, and how are pin assignments documented?
The D38999/24SB2HN-LC receptacle configuration incorporates a key pin and key slot that prevent incorrect mating orientation with the corresponding plug connector; mechanical keying ensures the D38999/24SB2HN-LC cannot be inserted 180 degrees reversed or misaligned. Pin assignment conventions for the D38999/24SB2HN-LC are documented in installation drawings provided by the OEM or equipment manufacturer, not in the connector datasheet; pin 1 may be designated as a ground reference, signal return, or power supply depending on circuit function. The D38999/24SB2HN-LC's two-contact arrangement typically employs one pin for active signal/power and one for return path, reducing ambiguity compared to multi-contact connectors. Technicians must verify pin assignments against the specific aircraft schematic or maintenance manual; universal assumptions about pin polarity do not apply across different D38999/24SB2HN-LC installations. Color-coded wire insulation or shrink tubing applied at the D38999/24SB2HN-LC cable termination provides secondary visual confirmation during reconnection.
How do vibration specifications for the D38999/24SB2HN-LC affect reliability in helicopters versus fixed-wing aircraft?
MIL-DTL-38999 vibration testing qualifies the D38999/24SB2HN-LC to withstand random vibration (typically 5–2000 Hz, 7.5 GRMS) and sinusoidal vibration sweeps representative of missile and aircraft environments. Helicopter powerplant and rotor gearbox vibration profiles often exceed fixed-wing baseline vibration levels due to rotor blade harmonic excitation and transmission gear mesh frequencies; the D38999/24SB2HN-LC must demonstrate contact retention and electrical continuity under these elevated acceleration environments. The D38999/24SB2HN-LC's two-contact configuration experiences lower total mechanical stress than multi-contact variants because fewer contact springs are deflected simultaneously, reducing cumulative fatigue. However, helicopter avionics mounted in vibration-isolated enclosures experience different acceleration profiles than airframe-mounted sensors; the D38999/24SB2HN-LC's reliability in helicopter service depends on installation location and shock isolation architecture. Maintenance records for D38999/24SB2HN-LC failures on helicopters typically show higher contact resistance degradation compared to fixed-wing installations, suggesting vibration-induced wear mechanisms may accelerate contact surface oxidation.

Parts with Similar Specifications

The three parts on the right have similar specifications to Amphenol Aerospace Operations D38999/24SB2HN-LC

Product Attribute D38999/24SB2HA-LC D38999/24SB2JN-LC D38999/24SB2JA-LC D38999/24SB2BN
Part Number D38999/24SB2HA-LC D38999/24SB2JN-LC D38999/24SB2JA-LC D38999/24SB2BN
Manufacturer Amphenol Aerospace Operations Amphenol Aerospace Operations Amphenol Aerospace Operations Souriau-Sunbank by Eaton
Coupling Nut Diameter - - - -
Ingress Protection - - - -
Features - - - Simultaneous Sampling
Material Flammability Rating - - - -
Shell Size, MIL - - - -
Shell Material - - - -
Packaging - - - -
Lead Free Status / RoHS Status - - - -
Coupling Nut Material, Plating - - - -
Note - - - -
Type - - - -
Number of Positions - - - -
Series - - - -
Connector Type - - - -
Includes - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Detailed Description - - - -
Shielding - - - -
Orientation - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Other Names - - - -
Contact Shape - - - -
Housing Color - - - -
Insert Material - - - -
Shell Finish - - - -
Shell Size - Insert - - - -
Contact Type - - - -
Fastening Type - - - -
Contact Size - - - -
Mounting Feature - - - -

D38999/24SB2HN-LC Datasheet PDF

Download D38999/24SB2HN-LC pdf datasheets and Amphenol Aerospace Operations documentation for D38999/24SB2HN-LC - Amphenol Aerospace Operations.

Datasheets
MIL-DTL-38999 Catalog.pdf

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Amphenol Aerospace Operations

D38999/24SB2HN-LC

Amphenol Aerospace Operations
98D-D38999/24SB2HN-LC

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