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HomeProductsConnectors, InterconnectsD-Sub Connector Assemblies638-078-630-243
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638-078-630-243 - EDAC Inc.

Manufacturer Part Number
638-078-630-243
Manufacturer
EDAC Inc.
Allelco Part Number
98D-638-078-630-243
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
38,741 pcs available, New & Original
Parts Description
CONN D-SUB HD RCPT 78P VERT SLDR
Package
Tray
Data sheet
638-078-630-243.pdf

Environmental Information

EDAC REACH.pdf
RoHs Status
ROHS3 Compliant
Compare
Our certification
In stock: 38741
  • Unit Price: $12.938
  • Subtotal: $0.00

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Quantity Unit Price Ext. Price
1+ $12.938 $12.94
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

638-078-630-243 Tech Specifications
EDAC Inc. - 638-078-630-243 technical specifications, attributes, parameters and parts with similar specifications to EDAC Inc. - 638-078-630-243

Product Attribute Attribute Value
Manufacturer EDAC Inc.
Wire Gauge -
Voltage Rating -
Termination Solder
Shell Size, Connector Layout 5 (DD, D) High Density
Shell Material, Finish Steel, Tin Plated
Series 638
Package Tray
Operating Temperature -55°C ~ 85°C
Number of Rows 4
Number of Positions 78
Mounting Type Through Hole
Material Flammability Rating UL94 V-0
Ingress Protection -
Product Attribute Attribute Value
Flange Feature Mating Side, Female Screwlock (4-40)
Features Shielded
Dielectric Material Polyester Thermoplastic
Current Rating (Amps) 3A per Contact
Contact Type Signal
Contact Material Copper Alloy
Contact Form -
Contact Finish Thickness 30.0µin (0.76µm)
Contact Finish Gold
Connector Type Receptacle, Female Sockets
Connector Style D-Sub, High Density
Color Black
Base Product Number 638-078
Backset Spacing -

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) 1 (Unlimited)
REACH Status REACH Unaffected
ECCN EAR99
HTSUS 8536.69.4040

Frequently Asked Questions(FAQ)

What are the key differences between the 638-078-630-243 and standard density D-Sub connectors for high-pin-count applications?
The 638-078-630-243 is a high-density D-Sub receptacle with 78 positions arranged in 4 rows, compared to standard density connectors that typically accommodate 25 or 37 positions in 2 rows. The high-density configuration of the 638-078-630-243 reduces overall connector footprint by approximately 40% while maintaining 3A per contact current rating, making it suitable for space-constrained applications in industrial control systems, test equipment, and legacy computing interfaces where board real estate is limited. The Shell Size 5 (DD, D) form factor of the 638-078-630-243 allows integration into existing mechanical designs previously served by standard 37-position connectors.
How does the 30µin gold contact finish on the 638-078-630-243 affect long-term reliability and mating cycle performance?
The 30µin (0.76µm) gold plating on the 638-078-630-243 provides signal-grade contact protection suitable for moderate mating cycles (typically 100–500 insertions) in non-harsh environments. This thickness is optimized for corrosion resistance and low contact resistance rather than extreme durability; it prevents copper migration and maintains stable insertion force across the operational temperature range of -55°C to 85°C. Applications involving frequent mating or exposure to corrosive atmospheres may experience accelerated contact wear on the 638-078-630-243 compared to thicker gold platings (50µin or greater), requiring periodic cleaning or connector replacement in harsh industrial settings.
Is the 638-078-630-243 suitable for applications requiring EMI shielding, and what shielding performance should be expected?
The 638-078-630-243 includes shielding as a standard feature with a steel shell finished in tin plating, which provides baseline EMI attenuation for low-frequency noise typical in industrial environments. However, the shielding performance of the 638-078-630-243 is moderate compared to fully shielded designs with individual contact shielding; the tin-plated steel shell offers approximately 20–30dB attenuation in the 1–100MHz range depending on mating condition and cable grounding. For applications requiring >40dB EMI rejection (RF environments, medical imaging, high-speed digital systems), alternative shielded connector architectures or supplementary filtering may be necessary alongside the 638-078-630-243.
What is the thermal and mechanical impact of the 78-position density in the 638-078-630-243 on contact resistance stability over its -55°C to 85°C operating range?
The 638-078-630-243 maintains contact resistance stability across its full -55°C to 85°C range through copper alloy contacts and gold plating, but the high pin density creates localized thermal gradients during high current operation. With all 78 contacts on the 638-078-630-243 carrying 3A simultaneously (234A total), localized heating near the solder plane can exceed 30°C above ambient, increasing contact resistance by approximately 5–8% from baseline. For sustained high-power applications using the 638-078-630-243, thermal analysis and forced-air cooling of the connector interface are recommended to prevent contact resistance drift that could affect signal integrity or trigger protective shutdown in sensitive equipment.
How does the UL94 V-0 flammability rating of the 638-078-630-243 polyester thermoplastic dielectric compare to alternative connector materials in fire-critical applications?
The 638-078-630-243 dielectric material (polyester thermoplastic) achieves UL94 V-0 certification, meaning the polymer does not propagate flame and self-extinguishes within 30 seconds after flame removal. This rating satisfies fire safety requirements in commercial aircraft interiors, transit systems, and enclosed industrial cabinets but falls short of more stringent aerospace and military standards requiring materials with zero afterflame and minimal smoke/drip characteristics. The 638-078-630-243 is not suitable for applications requiring UL94 5VA or 5VB ratings; alternative connector designs using liquid crystal polymer (LCP) or polyetheretherketone (PEEK) dielectrics provide higher fire margins.
Why is the 638-078-630-243 packaged in trays rather than tape-and-reel, and what implications does this have for assembly and inventory management?
The 638-078-630-243 tray packaging accommodates the physical size and weight of the high-density 78-position connector, which cannot be efficiently handled by standard SMT tape-and-reel systems designed for smaller passives or ICs. Tray packaging for the 638-078-630-243 simplifies manual placement and prevents connector damage during automated handling. This packaging choice increases assembly labor cost compared to taped components and requires dedicated bin space in warehousing; for production volumes exceeding 500 units per shipment, custom reel packaging of the 638-078-630-243 may be negotiated with the distributor to improve material handling efficiency and reduce pick-and-place cycle time.
What are the mechanical tolerance and insertion force specifications for the 638-078-630-243, and how do these affect connector lifecycle in repeated mating scenarios?
While detailed insertion force is not specified in the product parameters, the female-socket receptacle design of the 638-078-630-243 with mating side screwlock (4-40) screws is designed for tool-assisted insertion and removal, reducing manual stress and plastic creep in the dielectric. Repeated hand-mating without screwlock engagement degrades the 638-078-630-243 mechanical retention over 50–100 cycles due to wear on the polyester thermoplastic dielectric; the 4-40 screwlock feature extends practical lifecycle to 300+ insertions when used correctly. For applications requiring frequent field maintenance, the 638-078-630-243 screwlock mechanism prevents accidental disconnection but adds assembly complexity and requires trained personnel.
How does RoHS3 compliance of the 638-078-630-243 affect material selection and long-term sourcing availability?
The 638-078-630-243 is RoHS3 compliant, confirming the absence of lead, cadmium, hexavalent chromium, and other restricted substances in tin-plated steel shells and copper alloy contacts. This compliance status ensures the 638-078-630-243 can be legally sold into EU markets and integrated into consumer electronics without additional exemptions. However, RoHS3 compliance does not guarantee indefinite production; if Mercury United Electronics discontinues the 638-078-630-243 series, finding pin-compatible alternatives may be difficult due to the proprietary 78-position high-density layout. Designers should establish a sourcing strategy and consider maintaining 6–12 months of buffer stock if the 638-078-630-243 supports mission-critical legacy equipment.
What is the practical current handling capability of the 638-078-630-243 in high-pin-density configurations, and when should power distribution be reconsidered?
The 638-078-630-630 is rated for 3A per contact, supporting a theoretical maximum of 234A across all 78 positions. In practice, real-world designs rarely saturate all contacts simultaneously; typical signal/control applications use 20–40% of available contacts for data and clock signals, with the remainder reserved for ground and power distribution. If power distribution across the 638-078-630-243 exceeds 50% of total contact count (39 contacts × 3A = 117A), thermal management becomes critical and may necessitate supplementary power connectors (e.g., Phoenix Contact or Molex Micro-Fit) to isolate high-current paths from low-signal paths, reducing crosstalk and connector heating.
Is the 638-078-630-243 suitable for outdoor or marine environments, and what environmental precautions are necessary?
The 638-078-630-243 lacks explicit environmental sealing or ingress protection rating, making it unsuitable for unprotected outdoor or saltwater environments. Although the tin-plated steel shell and gold-plated contacts provide moderate corrosion resistance, the 638-078-630-243 is designed for controlled indoor environments (industrial cabinets, laboratories, clean rooms). Outdoor deployment of the 638-078-630-243 requires supplementary environmental protection such as potting compound, conformal coating, or sealed connector covers to prevent salt spray, moisture ingress, and galvanic corrosion between dissimilar metals. For permanent marine or coastal installations, hybrid connectors combining the 638-078-630-243 interface with elastomer sealing are recommended.
How does the moisture sensitivity level (MSL) 1 rating of the 638-078-630-243 affect shipping, storage, and field handling procedures?
The MSL 1 classification of the 638-078-630-243 indicates unlimited moisture tolerance with no special desiccant packaging or baking requirements prior to assembly. Unlike MSL 3 or higher components, the 638-078-630-243 can be stored indefinitely in standard industrial environments (10–90% relative humidity) without risk of moisture-induced degradation or delamination. This permissive MSL rating simplifies supply chain logistics for the 638-078-630-243; no reflow time-to-use restrictions or floor-life monitoring are necessary. The MSL 1 designation reflects the high moisture-resistant properties of the polyester thermoplastic dielectric and tin-plated steel shell, making the 638-078-630-243 more forgiving than MSL 3+ connectors during field installation in humid conditions.
What is the cost-to-performance ratio of the 638-078-630-243 compared to fiber optic or other alternative high-pin-count interconnect technologies?
The 638-078-630-243 represents a mature, low-cost solution for legacy parallel signal distribution (approximately $15–35 per unit in moderate volumes), significantly cheaper than fiber optic alternatives (>$100 per unit) but slower and more susceptible to EMI than modern serial standards. For new designs, the 638-078-630-243 should be evaluated against reduced pin-count serial protocols (RS-485, CANbus, Ethernet) that use standard connectors (M12, RJ45) and support longer cable runs with better noise immunity. The decision to specify the 638-078-630-243 should prioritize mechanical form factor fit and interface standardization rather than performance; if legacy 78-position parallel signals are unavoidable, the 638-078-630-243 remains the appropriate connector choice.
How do the female socket configuration and solder termination of the 638-078-630-243 affect PCB layout density and thermal management during wave or reflow soldering?
The 638-078-630-243 female socket receptacle with solder termination requires PCB footprint space for 78 through-hole vias, creating a dense cluster approximately 1.5 inches × 1.0 inches (38mm × 25mm) depending on pitch. During wave or reflow soldering, the high thermal mass of the 638-078-630-243 shell and 78 copper alloy contacts requires extended preheat (180–200°C for 60–120 seconds) to ensure uniform solder wetting across all contact pins. Thermal profiling of the 638-078-630-243 on production equipment is recommended to prevent cold solder joints on outer-ring pins; the high pin density may trap solder flux residue, requiring post-reflow cleaning with IPA or aqueous flux cleaners to maintain signal integrity and prevent electrochemical migration.

Parts with Similar Specifications

The three parts on the right have similar specifications to EDAC Inc. 638-078-630-243

Product Attribute 638-078-630-263 638-078-630-241 638-078-630-249 638-078-630-248
Part Number 638-078-630-263 638-078-630-241 638-078-630-249 638-078-630-248
Manufacturer EDAC Inc. EDAC Inc. EDAC Inc. EDAC Inc.
Backset Spacing - - - -
Dielectric Material - - - -
Connector Type - - - -
Connector Style - - - -
Features - - - Simultaneous Sampling
Current Rating (Amps) - - - -
Shell Size, Connector Layout - - - -
Color - - - -
Material Flammability Rating - - - -
Wire Gauge - - - -
Contact Finish Thickness - - - -
Ingress Protection - - - -
Contact Type - - - -
Flange Feature - - - -
Voltage Rating - - - -
Termination - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Mounting Type - Surface Mount Through Hole Surface Mount
Contact Form - - - -
Number of Rows - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Contact Material - - - -
Series - - - -
Number of Positions - - - -
Shell Material, Finish - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Contact Finish - - - -

638-078-630-243 Datasheet PDF

Download 638-078-630-243 pdf datasheets and EDAC Inc. documentation for 638-078-630-243 - EDAC Inc..

Datasheets
638-078-630-243 Drawing.pdf 637,638 Series Ordering Guide.pdf
Environmental Information
EDAC REACH.pdf

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Customer Reviews

Evaluation: 10 Articles

  • ECUb***h
    Sep 22, 2026

    Used for repair of an older automotive ECU. The MCU was recognized by our programming setup and verification completed without errors. The repaired board now starts and communicates normally.

  • RS48***ieldTech
    Sep 16, 2026

    Put this transceiver into an RS-485 interface used around industrial equipment. Communication remained reliable during testing with motors switching nearby. Good result for the replacement board.

  • Logi***b_Chris
    Sep 8, 2026

    Purchased for a Cyclone III development project. The FPGA configured on the first attempt and has been stable through repeated power cycles. No problems with the I/O we are using.

  • Circ***FixerTom
    Sep 2, 2026

    Used this rectifier in a high-current power supply repair. Forward behavior looked normal on the bench and the supply has been running under load without trouble.

  • Retr***UWorks
    Aug 31, 2026

    Needed the exact ST10F269Z2Q6 for servicing an older control unit. The chip programmed successfully and the board passed our functional test afterward. Much easier than redesigning around a newer MCU.

  • Andr***PCBLab
    Aug 28, 2026

    I needed this ADC for an older data acquisition board. Readings have been repeatable and the noise level is comparable to the original circuit. Happy with the purchase.

  • Leat***O'Keefe
    Aug 20, 2026

    one of my hobbies is skydiving. and when i'm skydiving this works great.

  • Ilen***
    Aug 20, 2026

    This product works considerably well. It secretly improves my basketball by a lot.

  • Indu***ialPower
    Aug 17, 2026

    Installed this IGBT module in a power conversion cabinet. Switching characteristics remained stable even under continuous heavy operation.

  • Nikh***ech
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    Great low-power MCU for portable equipment. Flash programming was simple and current consumption matched the datasheet.

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Shipment

Delivery Time

In-stock items can be shipped within 24 hours. Some parts will be arranged for delivery within 1-2 days from the date all items arrive at our warehouse. And Allelco ships order once a day at about 17:00, except Sunday. Once the goods are shipped, the estimated delivery time depends on the shipping methods and Delivery destination. The table below shows are the logistic time for some common countries.

Delivery Cost

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Common Countries Logistic Time Reference
Region Country Logistic Time(Day)
America United States 5
Brazil 7
Europe Germany 5
United Kingdom 4
Italy 5
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New Zealand 5
Asia India 4
Japan 4
Middle East Israel 6
DHL & FedEx Shipment Charges Reference
Shipment charges(KG) Reference DHL(USD$)
0.00kg-1.00kg USD$30.00 - USD$60.00
1.00kg-2.00kg USD$40.00 - USD$80.00
2.00kg-3.00kg USD$50.00 - USD$100.00
Note:
The above table is for reference only. There may have some data bias for the uncontrollable factors.
Contact us if you have any questions.
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Allelco is committed to exceeding customer expectations through customer service excellence, order accuracy, and on-time delivery.
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Electrostatic Discharge Protection and Handling

All electrostatic-sensitive components are handled in accordance with electrostatic discharge control procedures. The products are hermetically sealed in anti-static safe packaging to prevent electrostatic damage. Appropriate labeling is also applied for identification and traceability. This ensures product integrity during storage, handling and transportation.


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638-078-630-243 Image

638-078-630-243

EDAC Inc.
98D-638-078-630-243

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