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Home > Products > Connectors, Interconnects > Card Edge Connectors - Edgeboard Connectors > 857-078-520-207
EDAC Inc.
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857-078-520-207

In Stock 317 pcs Reference Price(In US Dollars)
25+
$124.6938
Manufacturer Part Number:
857-078-520-207
Manufacturer / Brand
EDAC Inc.
Part of Description:
CONN EDGE DUAL FMALE 78POS 0.156
Datasheets:
857-078-520-207(1).pdf857-078-520-207(2).pdf
Lead Free Status / RoHS Status:
ROHS3 Compliant
Stock Condition:
New original, 317 pcs Stock Available.
ECAD Model:
Ship From:
Hong Kong
Shipment Way:
DHL/Fedex/TNT/UPS

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Part Number 857-078-520-207
Manufacturer / Brand EDAC Inc.
Stock Quantity 317 pcs Stock
Category Connectors, Interconnects > Card Edge Connectors - Edgeboard Connectors
Description CONN EDGE DUAL FMALE 78POS 0.156
Lead Free Status / RoHS Status: ROHS3 Compliant
Termination Rows 2
Termination Solder
Series 857
Read Out Dual
Pitch 0.156" (3.96mm)
Package Bulk
Operating Temperature -40°C ~ 125°C
Number of Rows 2
Number of Positions/Bay/Row 39
Number of Positions 78
Mounting Type Through Hole
Material - Insulation Polyphenylene Sulfide (PPS)
Gender Female
Flange Feature Flush Mount, Top Opening, Threaded Insert, M3
Features -
Contact Type Semi Bellows
Contact Material Copper Alloy
Contact Finish Thickness 10.0µin (0.25µm)
Contact Finish Gold
Color Black
Card Type Non Specified - Dual Edge
Card Thickness 0.054" ~ 0.070" (1.37mm ~ 1.78mm)
Base Product Number 857-078

Packaging & ESD

Industry-standard static shielding packaging is used for electronic components.Anti-static, light-transparent materials allow easy identification of ICs and PCB assemblies.
The packaging structure provides electrostatic protection based on Faraday cage principles.This helps protect sensitive components from static discharge during handling and transportation.


All products are packed in ESD-safe anti-static packaging. Outer packaging labels include part number, brand, and quantity for clear identification. Goods are inspected prior to shipment to ensure proper condition and authenticity.

ESD protection is maintained throughout packing, handling, and global transportation. Secure packaging provides reliable sealing and resistance during transit. Additional cushioning materials are applied when required to protect sensitive components.

QC(Part Testing by IC Components)Quality Warranty

We can offer worldwide express delivery service, such as DHLor FedEx or TNT or UPS or other forwarder for shipment.

Global Shipment by DHL/FedEx/TNT/UPS

Shipping Fees reference DHL/FedEx
1). You can offer your express delivery account for shipment, ifyou haven’t any express account for shipment, we can offer our account inadvance.
2). Use our account for shipment, Shipment charges(Reference DHL/FedEx, Different Countries has different price.)
Shipment charges： (Reference DHL and FedEX)
Weight(KG): 0.00kg-1.00kg Price(USD$) : USD$60.00
Weight(KG): 1.00kg-2.00kg Price(USD$) : USD$80.00
* The price of cost is reference with DHL/FedEx. The detail charges, please contact us. Different country the express charges are different.



We accept the payment terms: Telegraphic Transfer(T/T), Credit Card, PayPal and Western Union.

PayPal:

PayPal Bank Information:
Company Name : IC COMPONENTS LTD
Paypal ID: Info@IC-Components.com

BANK TRANSFAR (Telegraphic Transfer)

Payment For Telegraphic Transfers:
Company Name : IC COMPONENTS LTD Beneficiary Account Number : 549-100669-701
Beneficiary Bank name : Bank of Communications (Hong Kong) Ltd Beneficiary Bank Code : 382 (for local payment)
Beneficiary Bank SWIFT : COMMHKHK
Beneficiary Bank Address : Tsuen Wan Market Street Branch 53 Market Street, Tsuen Wan N.T., Hong Kong

Any inquires or questions, please kindly contact us Email: Info@IC-Components.com


Frequently Asked Questions

Is the 857-078-520-207 suitable if my card thickness is not exactly 1.6 mm?
The 857-078-520-207 is specified for card thicknesses from 0.054" to 0.070" (1.37 mm to 1.78 mm). For a design near the limits, verify insertion force, contact wipe, and retention in the actual assembly stack-up. If the card is thinner than the range, contact pressure can drop and intermittent connections may appear under vibration; if thicker, insertion damage or excessive stress on the contacts can occur.
Can the 857-078-520-207 be used when I need a dual-edge connector for a backplane or daughtercard interface?
Yes, the 857-078-520-207 is a 78-position female dual-edge card edge connector, so it fits designs where both sides of the card are used for signal routing. In practice, confirm that your pinout, keepouts, and connector orientation match the dual-edge readout scheme, because the electrical mapping and mechanical reference edge must line up with the board layout.
What PCB design constraints should I check before using the 857-078-520-207 in a new layout?
With the 857-078-520-207, the main checks are card thickness tolerance, edge bevel quality, through-hole footprint, and the flush-mount flange geometry with M3 threaded insert retention. You should also verify board edge clearance for the top-opening entry path and confirm the connector body height does not interfere with adjacent components or enclosure features.
Is the 857-078-520-207 appropriate for industrial equipment or high-temperature environments?
The 857-078-520-207 is rated for -40°C to 125°C and uses PPS insulation, which makes it a reasonable fit for industrial assemblies exposed to elevated ambient temperatures. For long-term use, confirm the full system limit includes solder joint stress, nearby heat sources, and any temperature cycling that could affect the PCB edge plating or mechanical retention.
How does the gold contact finish on the 857-078-520-207 affect reliability in low-level signal applications?
The 857-078-520-207 uses gold-plated contacts with 10.0 µin thickness over a copper alloy base, which generally helps maintain stable contact resistance in low-current or low-voltage signal paths. For very low-level signals, keep the mating surfaces clean and avoid environmental contamination, since connector performance is often limited more by fretting or oxidation on the board edge than by the contact alloy itself.
Can I replace the 857-078-520-207 with another 78-position card edge connector from a different brand?
A replacement for the 857-078-520-207 needs to match more than the pin count. You need the same 0.156" pitch, dual-edge female format, compatible 1.37 mm to 1.78 mm card thickness window, and a footprint that preserves the flush-mount threaded insert arrangement. Different brands can also vary in contact geometry and insertion force, which can change board retention and mating reliability.
What should I compare if I am migrating from the 857-078-520-207 to a lower-cost connector?
When moving away from the 857-078-520-207, compare contact plating thickness, contact spring style, retention hardware, and rated temperature range. Lower-cost parts sometimes reduce gold thickness, change the contact wipe path, or omit threaded mounting features, which can be acceptable in benign environments but less forgiving in systems with vibration, frequent service, or long service life.
Is the 857-078-520-207 a good choice for high-vibration equipment?
The 857-078-520-207 includes a flush-mount threaded insert with M3 hardware support, which helps mechanical anchoring compared with purely friction-retained connectors. For vibration-prone equipment, also evaluate the card support strategy, strain relief on the PCB, and whether the mating edge maintains enough normal force after repeated thermal and mechanical cycling.
What failure modes should I watch for when using the 857-078-520-207 over many mating cycles?
With the 857-078-520-207, the common long-term concerns are contact wear, reduced spring force, and contamination on the card edge. Gold plating helps, but repeated insertion still changes contact behavior over time, so designs with frequent service should include maintenance access, controlled insertion alignment, and inspection of the edge plating condition.
Can the 857-078-520-207 be used for power as well as signals?
The 857-078-520-207 can carry power only if the current, spacing, and thermal rise stay within your system limits. Card edge connectors often work well for mixed signal and moderate power distribution, but you should validate current per contact, total pin loading, and heat dissipation in the final enclosure rather than assuming the connector can handle all pins equally.
Is the 857-078-520-207 suitable for replacing older 78-position edge connectors in legacy equipment?
The 857-078-520-207 can be a practical replacement in legacy systems when the pitch, card thickness, and mounting style match the original design. The critical check is board-edge geometry: even small differences in bevel, insertion depth, or flange position can affect mating reliability, especially in older assemblies that were designed around a specific connector family.
What should I verify before choosing the 857-078-520-207 for a production design?
Before standardizing on the 857-078-520-207, verify footprint compatibility, mating card thickness tolerance, required retention force, and environmental exposure. For production use, it is also worth checking availability strategy, since bulk-pack components can be easy to source for prototyping but should still be qualified against your long-term supply and second-source plan.

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857-078-520-207

857-078-520-207

EDAC Inc.

CONN EDGE DUAL FMALE 78POS 0.156

In Stock: 317

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