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HomeProductsConnectors, InterconnectsCard Edge Connectors - Edgeboard Connectors346-040-558-202
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346-040-558-202 - EDAC Inc.

Manufacturer Part Number
346-040-558-202
Manufacturer
EDAC Inc.
Allelco Part Number
98D-346-040-558-202
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
31,652 pcs available, New & Original
Parts Description
CONN EDGE DUAL FMALE 40POS 0.125
Package
Box
Data sheet
346-040-558-202.pdf

Environmental Information

EDAC REACH.pdf
RoHs Status
ROHS3 Compliant
Compare
Our certification
In stock: 31652
  • Unit Price: $10.776
  • Subtotal: $0.00

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Quantity Unit Price Ext. Price
1+ $10.776 $10.78
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

346-040-558-202 Tech Specifications
EDAC Inc. - 346-040-558-202 technical specifications, attributes, parameters and parts with similar specifications to EDAC Inc. - 346-040-558-202

Product Attribute Attribute Value
Manufacturer EDAC Inc.
Termination Rows 2
Termination Solder, Wire Wrap
Series 346
Read Out Dual
Pitch 0.125" (3.18mm)
Package Box
Operating Temperature -40°C ~ 105°C
Number of Rows 2
Number of Positions/Bay/Row 20
Number of Positions 40
Mounting Type Through Hole, Right Angle
Product Attribute Attribute Value
Material - Insulation Polyester Thermoplastic
Gender Female
Flange Feature Flush Mount, Top Opening, Unthreaded, 0.128" (3.25mm) Dia
Features -
Contact Type Cantilever
Contact Material Copper Alloy
Contact Finish Thickness 10.0µin (0.25µm)
Contact Finish Gold
Color Green
Card Type Non Specified - Dual Edge
Card Thickness 0.054" ~ 0.070" (1.37mm ~ 1.78mm)
Base Product Number 346-040

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
REACH Status REACH Unaffected
ECCN EAR99
HTSUS 8536.69.4040

Frequently Asked Questions(FAQ)

What are the mechanical tolerances I need to verify when designing a PCB edge slot for the 346-040-558-202 connector?
The 346-040-558-202 accepts cards with a thickness range of 0.054" to 0.070" (1.37–1.78mm), which establishes the critical dimension for your edge slot. The connector features a 0.125" (3.18mm) pitch across 40 positions arranged in 2 rows, so your PCB edge must fit within the dual-row geometry without binding. The flange has a 0.128" (3.25mm) diameter unthreaded opening for alignment. Slot depth and width should be verified against your specific PCB material and the connector's cantilever contact design to ensure proper seating without mechanical stress that could affect electrical continuity over thermal cycles.
How does the gold contact finish thickness on the 346-040-558-202 affect long-term reliability in industrial environments?
The 346-040-558-202 specifies a 10.0µin (0.25µm) gold contact finish over copper alloy substrates. This plating thickness is a thin noble layer suitable for low-energy insertion cycles and environments with moderate humidity. In industrial settings with frequent mechanical insertion cycles, thermal shock, or high-moisture exposure, the thin gold layer may wear through to the copper alloy substrate more quickly than thicker plating (typically 50–100µin). Copper oxidation at contact interfaces becomes a concern if the gold layer is compromised, particularly at operating temperatures near the upper limit of -40°C to 105°C. Evaluate insertion cycle count, ambient humidity, and thermal cycling frequency when assessing field reliability of the 346-040-558-202.
Can the 346-040-558-202 accommodate both wire wrap and solder termination simultaneously on the same connector instance?
The 346-040-558-202 supports both solder and wire wrap termination methods, but these are alternative termination technologies rather than methods that mix on a single connector instance. The two termination rows on the 346-040-558-202 provide 20 positions each, allowing you to design a backplane architecture where one row uses solder termination for permanent board attachment and the other row uses wire wrap for signal distribution or test points. However, individual contact positions on the 346-040-558-202 are not designed to accept both termination types simultaneously. Your PCB layout must designate each row's termination method in advance to accommodate the different contact geometries and hole patterns required.
What is the practical current rating per contact on the 346-040-558-202, and how does dual-edge configuration affect thermal management?
The 346-040-558-202 datasheet does not specify a discrete per-contact current limit; however, the cantilever contact design and copper alloy material with thin gold finish typically support 1–3 amperes per contact in standard applications. The dual-edge, dual-row architecture of the 346-040-558-202 distributes signals and power across 40 positions, which reduces current concentration compared to single-row connectors. Thermal dissipation depends on contact spring force, insertion depth, and the proximity of adjacent contacts carrying return currents. At operating temperatures approaching 105°C, verify that your signal integrity and power distribution plan does not cluster high-current paths on the 346-040-558-202, as localized heating at contact interfaces can accelerate gold layer degradation and increase contact resistance.
How does the 0.125" pitch of the 346-040-558-202 compare to standard 0.100" pitch connectors for high-density designs?
The 346-040-558-202 uses a 0.125" (3.18mm) pitch, which is 25% coarser than the common 0.100" pitch found in many modern edge connectors. This larger pitch provides wider contact spacing on the 346-040-558-202, which improves crosstalk immunity and simplifies PCB trace routing in the edge area compared to 0.100" designs. However, the 0.125" pitch of the 346-040-558-202 results in lower overall density: 40 positions fit within a connector footprint that a 0.100" pitch design would accommodate with approximately 50 positions. For applications prioritizing signal integrity and thermal management over spatial density, the 346-040-558-202 is advantageous; for compact backplane systems, consider whether the larger pitch of the 346-040-558-202 aligns with your density requirements or requires a different connector series.
What are the design implications of the green color and flush-mount, top-opening flange on the 346-040-558-202?
The 346-040-558-202 features a green polyester thermoplastic insulation body with a flush-mount, top-opening flange. The flush-mount design minimizes stack height on the backplane, which is valuable in confined mechanical envelopes. The top-opening flange on the 346-040-558-202 allows card insertion from above without side-access constraints, simplifying assembly and field replacement workflows. Green insulation is standard for the Mercury 346 series and has no functional significance; however, it provides visual identification during assembly and troubleshooting. The unthreaded flange design means the 346-040-558-202 relies on friction fit and PCB-edge contact pressure for mechanical retention rather than screw-down clamping, which is typical for edge connectors but requires careful PCB edge preparation and insertion technique to prevent misalignment.
What precautions should be taken when transitioning designs from the 346-040-558-202 to higher-temperature or aerospace-qualified connector alternatives?
The 346-040-558-202 is rated for -40°C to 105°C operation and carries RoHS3 compliance, making it suitable for commercial and industrial applications but not inherently rated for aerospace or extended temperature ranges. If your design requires qualification above 105°C or certification under MIL-SPEC or AS9100 standards, migration from the 346-040-558-202 to a higher-performance connector series will involve multiple design changes: contact pitch may differ, requiring PCB edge geometry revision; contact materials and plating thickness typically increase, affecting mechanical tolerances; flange design and mounting style may change; and lead times and supply availability differ significantly. Early prototyping and thermal validation of the 346-040-558-202 in your specific application will help identify thermal margins and inform whether a connector upgrade is necessary before committing to production layouts.
How does the right-angle mounting orientation of the 346-040-558-202 affect signal routing and impedance control?
The 346-040-558-202 is configured for right-angle, through-hole mounting, meaning the connector body extends perpendicular to the PCB surface. This geometry routes signals away from the plane of the card edge, allowing backplane traces to distribute signals vertically through the PCB stack. Right-angle mounting of the 346-040-558-202 simplifies multilayer backplane design by eliminating the need for edge connectors that would otherwise occupy PCB trace routing layers at the card edge. However, the right-angle orientation introduces trace length differences between contact positions on the 346-040-558-202, which affects impedance matching for high-speed signals. Shorter traces from flange-proximal contacts will have different delay and characteristic impedance compared to traces from far-end contacts, requiring careful PCB stackup design and trace length tuning to maintain signal integrity across all 40 positions on the 346-040-558-202.
What is the card insertion force and wiping action behavior of the cantilever contacts on the 346-040-558-202?
The 346-040-558-202 uses cantilever contact springs, which means each contact deflects as the edge card is inserted, creating a wiping action that clears light oxidation and contaminants from contact surfaces. Cantilever designs on the 346-040-558-202 typically generate 15–25 grams of insertion force per contact, resulting in cumulative insertion force of 600–1000 grams for the full 40-position connector. This moderate insertion force is accessible by hand during field card replacement but requires calibrated insertion fixtures in manufacturing environments to prevent excessive force that could damage PCB edges or misalign contacts on the 346-040-558-202. Wiping action on the 346-040-558-202 improves reliability for infrequently mated connectors; however, insertion force increases slightly with each cycle due to gold layer compression, so verify that insertion tooling and operator training accommodate force variations over the product lifecycle.
How should the polyester thermoplastic insulation material of the 346-040-558-202 be handled during assembly, rework, and thermal testing?
The 346-040-558-202 body is constructed from polyester thermoplastic, which softens gradually between 80–110°C and can distort or shrink under sustained heat. This material selection limits rework procedures: wave soldering or reflow temperatures must be controlled, and the 346-040-558-202 should not be exposed to sustained temperatures above 100°C during assembly unless thermal testing is already completed. The polyester thermoplastic material on the 346-040-558-202 can absorb moisture in humid environments, potentially affecting dielectric properties over time; storage in controlled humidity (20–60% RH) is recommended. During thermal cycling between -40°C and 105°C, polyester exhibits slight dimensional change, which can contribute to creep in contact pressure over extended field service. For applications with frequent thermal cycling or high-humidity exposure, periodic contact resistance monitoring of the 346-040-558-202 should be considered as part of preventive maintenance protocols.
What are the key differences between the dual-edge architecture of the 346-040-558-202 and single-edge connector designs?
The 346-040-558-202 is configured as a dual-edge connector with two rows of 20 positions each, allowing a single edge card to interface with the backplane through 40 contact points. Dual-edge designs like the 346-040-558-202 reduce physical card length compared to single-edge connectors that would require equivalent contact count, which saves vertical space in compact backplane systems. The dual-row architecture of the 346-040-558-202 also improves current distribution and thermal management by spreading signal and power across more contact points than a single-row design. However, the dual-edge geometry of the 346-040-558-202 requires precise alignment of the card edge with both connector rows, increasing sensitivity to PCB flatness, edge squareness, and insertion technique. For applications with relaxed space constraints, single-edge connectors may offer simpler assembly and lower risk of insertion misalignment compared to the dual-edge 346-040-558-202.
What environmental compliance testing should be performed on products using the 346-040-558-202 before release to production?
The 346-040-558-202 is RoHS3 compliant and REACH unaffected, satisfying regulatory requirements in EU and similar markets. However, compliance of the finished assembly depends on the complete bill of materials and solder alloy used in the 346-040-558-202 termination process. Environmental testing recommendations for products using the 346-040-558-202 include thermal cycling (-40°C to 105°C per applicable standards), thermal shock, humidity exposure (85% RH, elevated temperature), and salt-spray testing if marine or corrosive environments are anticipated. Contact resistance measurements on the 346-040-558-202 should be verified before and after environmental exposure to detect degradation in the thin gold plating or contact spring performance. Mechanical insertion cycle testing of the 346-040-558-202 (typically 100–500 cycles) is recommended to establish expected contact resistance evolution and predict field maintenance intervals.
How does the Mercury 346 series base design of the 346-040-558-202 affect component lead time and inventory strategy?
The 346-040-558-202 is part of the Mercury 346 base series, which indicates a long-established connector family with broad industry adoption. The base product number 346-040 encompasses multiple configurations, including the dual-edge, 40-position variant represented by the 346-040-558-202. Broad series adoption often means improved lead-time stability compared to specialized or newer connector families; however, manufacturer discontinuation schedules should be verified with Mercury United Electronics, Inc. because even established series are subject to lifecycle phases. For designs currently using the 346-040-558-202, establishing secondary sources or equivalent alternatives from other manufacturers (such as Amphenol or Molex dual-edge connectors at 0.125" pitch) is prudent to mitigate supply disruption risk. Lead-time sensitivity for the 346-040-558-202 is typically moderate compared to specialty connectors, making it suitable for products with 6–12 month demand forecasting but not suitable for just-in-time supply chains without inventory buffers.

Parts with Similar Specifications

The three parts on the right have similar specifications to EDAC Inc. 346-040-558-202

Product Attribute 346-040-558-602 346-040-558-207 346-040-558-204 346-040-558-203
Part Number 346-040-558-602 346-040-558-207 346-040-558-204 346-040-558-203
Manufacturer EDAC Inc. EDAC Inc. EDAC Inc. EDAC Inc.
Pitch - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Gender - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Mounting Type - Surface Mount Through Hole Surface Mount
Series - - - -
Card Type - - - -
Number of Positions - - - -
Termination - - - -
Termination Rows - - - -
Contact Finish Thickness - - - -
Number of Positions/Bay/Row - - - -
Flange Feature - - - -
Features - - - Simultaneous Sampling
Contact Type - - - -
Contact Material - - - -
Read Out - - - -
Color - - - -
Number of Rows - - - -
Material - Insulation - - - -
Card Thickness - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Contact Finish - - - -

346-040-558-202 Datasheet PDF

Download 346-040-558-202 pdf datasheets and EDAC Inc. documentation for 346-040-558-202 - EDAC Inc..

Datasheets
346-040-558-202 Drawing.pdf 346,396 Series Ordering Guiide.pdf
Environmental Information
EDAC REACH.pdf

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    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.

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346-040-558-202 Image

346-040-558-202

EDAC Inc.
98D-346-040-558-202

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