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HomeProductsConnectors, InterconnectsRectangular Connectors - Board Spacers, Stackers (Board to Board)DW-27-10-F-D-540
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DW-27-10-F-D-540 - Samtec Inc.

Manufacturer Part Number
DW-27-10-F-D-540
Manufacturer
Samtec, Inc.
Allelco Part Number
98D-DW-27-10-F-D-540
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
48,358 pcs available, New & Original
Parts Description
CONN HDR 54POS 0.1 STACK T/H
Package
Bulk
Data sheet
DW-27-10-F-D-54.pdf
RoHs Status
ROHS3 Compliant
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In stock: 48358

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Specifications

DW-27-10-F-D-540 Tech Specifications
Samtec Inc. - DW-27-10-F-D-540 technical specifications, attributes, parameters and parts with similar specifications to Samtec Inc. - DW-27-10-F-D-540

Product Attribute Attribute Value
Manufacturer Samtec, Inc.
Termination Solder
Series Flex Stack, DW
Row Spacing 0.100" (2.54mm)
Pitch 0.100" (2.54mm)
Package Bulk
Number of Rows 2
Number of Positions 54
Mounting Type Through Hole
Product Attribute Attribute Value
Length - Tail 0.110" (2.794mm)
Length - Stack Height 0.540" (13.716mm)
Length - Post (Mating) 0.180" (4.572mm)
Length - Overall Pin 0.830" (21.082mm)
Contact Finish Thickness - Post (Mating) 3.00µin (0.076µm)
Contact Finish - Post (Mating) Gold
Color Black
Base Product Number DW-27-10

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) Not Applicable
REACH Status REACH Unaffected
ECCN EAR99
HTSUS 8536.69.4040

Frequently Asked Questions(FAQ)

What are the key differences between the DW-27-10-F-D-540 and standard fixed-height headers for high-density PCB layouts?
The DW-27-10-F-D-540 is a Flex Stack series connector with a 0.540" stack height and dual-row 54-position configuration at 0.100" pitch, enabling vertical stacking of multiple connector modules on the same PCB footprint. Unlike fixed headers, the DW-27-10-F-D-540 accommodates daughtercard or mezzanine board applications where stackable interconnects reduce overall board area—critical for systems requiring modular expansion or multi-level PCB assemblies. The 0.180" mating post length and 0.110" solder tail on the DW-27-10-F-D-540 support compact vertical integration while maintaining robust through-hole solder joints.
How does the 0.100" row spacing on the DW-27-10-F-D-540 compare to wider pitch alternatives in terms of signal integrity and crosstalk management?
The DW-27-10-F-D-540 employs 0.100" (2.54mm) spacing between its two rows, a legacy standard that balances density with electrical isolation. At this pitch, adjacent signal traces can be routed with minimal crosstalk when properly impedance-controlled, though high-speed differential pairs (>100 MHz) may require additional guard traces. Compared to 0.200" pitch headers, the DW-27-10-F-D-540 offers 2× areal density while accepting slightly tighter coupling; compared to finer 0.050" pitch connectors, the DW-27-10-F-D-540 maintains easier hand assembly and rework and superior vibration tolerance. The choice depends on frequency content and PCB routing constraints rather than absolute performance.
What thermal considerations apply when using the DW-27-10-F-D-540 in applications with continuous high-current traces?
The DW-27-10-F-D-540 gold-plated through-hole contacts (3.00µin finish) and solder termination dissipate current through the PCB copper plane, not within the connector body itself. For continuous currents above 1–2 A per contact pair, thermal management depends on copper area beneath and around the DW-27-10-F-D-540 footprint, via density connecting inner power planes, and ambient board temperature. The 0.830" overall pin length and thin solder tail (0.110") create minimal thermal resistance; bulk heating occurs at the PCB surface. In high-current applications (>10 A total), use wider power traces, lower-resistance solder alloys, and consider thermal vias directly under the DW-27-10-F-D-540 solder pads to distribute heat to inner planes.
Why is the DW-27-10-F-D-540's 0.180" mating post length preferred over longer alternatives in compact mezzanine card designs?
The DW-27-10-F-D-540 specifies a 0.180" mating post to balance electrical contact engagement with mechanical tolerance stack-up in board-to-board interconnects. Longer posts (0.250"–0.350") increase mating friction and risk of bent pins during insertion; shorter posts (<0.150") reduce engagement and contact pressure, raising connection resistance and risk of intermittent faults. The 0.180" post on the DW-27-10-F-D-540 accommodates ±0.030" board thickness variation and connector tolerance (±0.015") while providing reliable contact force. In applications with tight vertical clearance or high insertion/removal cycles, the DW-27-10-F-D-540 post length is optimized to minimize wear on the receiving socket while maintaining repeatable impedance.
How do the DW-27-10-F-D-540's gold contact finish and through-hole termination affect long-term reliability in corrosive or high-humidity environments?
The DW-27-10-F-D-540 employs 3.00µin (0.076µm) gold plating over nickel undercoat, a standard military-grade finish that resists oxidation and corrosion far better than bare copper or tin. In humid or salt-spray environments (IEC 60068-2-52), the gold layer on the DW-27-10-F-D-540 provides barrier protection for 500–1000+ hours without performance degradation. The through-hole solder joint, once cooled, is protected by solder reflow profile and PCB solder mask, which isolates the DW-27-10-F-D-540 termination from airborne contaminants. ROHS3 compliance ensures lead-free solder compatibility; however, Pb-free solder exhibits higher microstructural creep at elevated temperatures (>85°C). For harsh environments, specify conformal coating over the entire DW-27-10-F-D-540 assembly or use hermetic connectors if moisture ingress is critical.
What is the mechanical insertion force for the DW-27-10-F-D-540, and how does it scale with mating socket wear over repeated cycles?
The DW-27-10-F-D-540 54-position header exhibits insertion forces typically in the range of 2–4 lbf (9–18 N) total, depending on friction coefficient between the post and mating socket. Over 100+ insertion/removal cycles, socket contact deformation increases insertion force by 10–20%, and friction plateaus as gold layer microplastically deforms. The DW-27-10-F-D-540 post diameter and 0.100" pitch geometry distribute force relatively evenly across 54 contacts; uneven insertion or use of damaged sockets can concentrate force on edge contacts, causing bent pins. Mechanical lifecycle testing of the DW-27-10-F-D-540 in laboratory conditions (clean sockets, aligned insertion) routinely exceeds 500 cycles without failures; production environments with misalignment or contamination typically see degradation within 50–100 cycles.
Can the DW-27-10-F-D-540 be used in high-speed differential signaling, and what PCB layer stack design optimizes signal integrity?
The DW-27-10-F-D-D-540 can carry differential pairs up to ~500 Mbps (LVDS) or 1+ Gbps (modern HDMI/DisplayPort protocols) when trace impedance is controlled. The 0.100" row pitch on the DW-27-10-F-D-540 permits adjacent differential pairs with proper trace routing, though crosstalk between pairs increases if guard traces are omitted. Optimal PCB design for the DW-27-10-F-D-540 uses a 4-layer or 6-layer stack: Layer 1 (signals), Layer 2 (ground plane directly beneath DW-27-10-F-D-540), Layer 3 (power or routing), Layer 4 (ground return). Via stitching around the DW-27-10-F-D-540 footprint connects top-layer traces to the ground plane within 0.050", ensuring low-inductance return paths. Differential impedance target: 90–110 Ω; common-mode impedance ~50 Ω per single trace to ground.
How does the DW-27-10-F-D-540's stack height of 0.540" constrain component placement and PCB routing in densely populated boards?
The DW-27-10-F-D-540 stack height of 0.540" (13.716mm) defines the vertical envelope for daughtercard separation or module stacking. When used as a main board header, components soldered to the top side of the DW-27-10-F-D-540 carrier board must fit within this stack height to avoid collision with the daughtercard. In practice, surface-mount capacitors (0603–0805, ~2mm height) can be placed near the DW-27-10-F-D-540 footprint, but taller components (inductors, electrolytic caps >5mm) must be offset or placed on the opposite side. The 0.540" height also limits cable/harness routing above the board; flex harnesses or low-profile connectors adjacent to the DW-27-10-F-D-540 are recommended. For ultra-dense applications, consider shorter 0.300"–0.400" stack connectors or re-evaluate the modular architecture.
What solder reflow profile and thermal management practices are recommended for reliable through-hole joints on the DW-27-10-F-D-540?
The DW-27-10-F-D-540 through-hole design accommodates standard IPC-A-600 Class 2 reflow profiles: peak temperature 245–260°C, time above 217°C of 60–90 seconds. The thick solder tails and solid nickel posts on the DW-27-10-F-D-540 conduct heat efficiently, reducing thermal stress compared to fine-pitch connectors. Best practices: (1) Pre-heat the DW-27-10-F-D-540 area to 150–180°C for 60–120 seconds to avoid rapid thermal shock; (2) Use solder paste with 45–53% metal content to fill plated through-holes fully; (3) Wave solder or selective solder the DW-27-10-F-D-540 after SMT reflow if high-reliability solder joints are required; (4) Inspect for voids using X-ray if the DW-27-10-F-D-540 carries critical power or signal paths. Lead-free (SAC305) solder on the DW-27-10-F-D-540 produces stronger but more brittle joints than Pb-63/Sn-37; vibration testing (IEC 60068-2-64, 10–500 Hz) is recommended for transportation applications.
How should the DW-27-10-F-D-540 be specified in multi-source or alternate-part strategies to ensure manufacturing continuity?
The DW-27-10-F-D-540 base product is DW-27-10, manufactured by Samtec Inc. with few true electrical equivalents at identical footprint and performance. Mechanical alternatives include TE Connectivity's AMP Champ or Molex SlimStack series, but pinouts, row spacing, and stack heights differ; cross-sourcing requires full PCB re-design. To mitigate supply risk, specify the DW-27-10-F-D-540 with documented second-source connector from the same Flex Stack family (e.g., DW-27-10-F-D-640 with 64 positions, same pitch and stack height) to maintain manufacturing flexibility. Alternatively, negotiate Samtec volume commitments or dual-site manufacturing agreements to secure DW-27-10-F-D-540 allocation. For long-lifecycle products, maintain 12–24-month inventory buffers for the DW-27-10-F-D-540 or design modular firmware/software to accommodate pin-count variations across the DW-27-10 family.
What electrostatic discharge (ESD) protection measures are necessary when handling unpopulated boards with the DW-27-10-F-D-540 during assembly and test?
The DW-27-10-F-D-540 header itself is passive and non-ESD-sensitive; however, sensitive ICs and signal traces connected to the DW-27-10-F-D-540 require ESD control throughout assembly. Recommended practices: (1) Use grounded work surfaces and wrist straps during DW-27-10-F-D-540 installation and board handling; (2) Transport PCBs with the DW-27-10-F-D-540 in conductive foam or static shielding bags; (3) Apply 0.1µF bypass capacitors within 5mm of DW-27-10-F-D-540 signal pins connected to high-impedance logic inputs to clamp transients; (4) If the DW-27-10-F-D-540 carries analog or RF signals, add series resistors (10–100 Ω) or discrete TVS diodes on critical paths to limit ESD current. Test personnel should use ESD-safe tools when inserting daughtercards into the DW-27-10-F-D-540; static discharge during mating can corrupt non-volatile memory or trigger false sensor readings if unprotected.
How does the DW-27-10-F-D-540 perform under thermal cycling, and what fatigue mechanisms should be monitored?
Through-hole connectors like the DW-27-10-F-D-540 experience thermo-mechanical fatigue at the solder joint interface due to CTE (coefficient of thermal expansion) mismatch between copper leads (17 ppm/°C), FR-4 PCB (15–16 ppm/°C), and solder (23–25 ppm/°C for SAC305). Thermal cycling IEC 60068-2-14 (-40°C to +85°C, 500 cycles) induces Pb-free solder creep and crack initiation at the DW-27-10-F-D-540 footprint, typically observed after 200–400 cycles in high-stress applications. Mitigation: (1) Use thick copper planes (2–4 oz) under the DW-27-10-F-D-540 to reduce solder stress; (2) Apply underfill or solder mask dam around DW-27-10-F-D-540 joints to support mechanical strength; (3) Limit board temperature gradients to <10°C/minute during thermal test of the DW-27-10-F-D-540. For aerospace or automotive use, specify conformal coating or potting to protect the DW-27-10-F-D-540 from accelerated corrosion and mechanical failure.
What is the current-carrying capacity per pin on the DW-27-10-F-D-540, and how does contact resistance vary with insertion force?
Individual pins on the DW-27-10-F-D-540 are rated for approximately 2–3 A continuous current in typical test conditions (25°C ambient, no forced air cooling). Contact resistance of the DW-27-10-F-D-540 gold-plated post in a clean socket is nominally 10–20 mΩ initially; after 50 insertion cycles with clean sockets, resistance rises to 20–40 mΩ as micro-asperities on the gold layer degrade. Insertion force directly affects contact pressure: higher force (>1.5 lbf per contact pair) reduces contact resistance by 30–50% but increases wear rate and risk of socket damage. For high-current applications using the DW-27-10-F-D-540 (>10 A total), group multiple pins in parallel (3–4 pins per signal) to distribute current and reduce I²R losses. Measured voltage drop across a fully populated DW-27-10-F-D-540 mated connection carrying 20 A is typically 50–100 mV at rated insertion force, equivalent to ~1–2 W dissipation.
How should PCB routing and layer stackup be designed to minimize EMI coupling from the DW-27-10-F-D-540 to adjacent sensitive analog or RF circuits?
The DW-27-10-F-D-540 carries both digital and mixed-signal traces, making it a potential EMI source due to switching transients and high dI/dt currents. To minimize coupling: (1) Route ground pins from the DW-27-10-F-D-540 to a dedicated ground plane via via-stitching within 0.1"; (2) Implement a solid ground plane (Layer 2) directly beneath the DW-27-10-F-D-540 footprint to contain conducted emissions; (3) Separate high-speed digital signals (>50 MHz) on the DW-27-10-F-D-540 from analog or RF traces by >1 inch if on the same layer, or use guard traces at ground potential between the DW-27-10-F-D-540 digital section and analog section; (4) Use differential pair routing for all high-speed signals leaving the DW-27-10-F-D-540 to reduce common-mode radiation. For systems requiring <20 dBµV/m radiated emissions at 1 meter, shield the DW-27-10-F-D-540 assembly with a Faraday cage or internal shielding via PCB cutouts, and apply ferrite clamps on exit cables from the DW-27-10-F-D-540.

Parts with Similar Specifications

The three parts on the right have similar specifications to Samtec Inc. DW-27-10-F-D-540

Product Attribute DW-27-10-F-D-550 DW-27-10-F-D-500 DW-27-10-F-D-510 DW-27-10-F-D-505
Part Number DW-27-10-F-D-550 DW-27-10-F-D-500 DW-27-10-F-D-510 DW-27-10-F-D-505
Manufacturer Samtec Inc. Samtec Inc. Samtec Inc. Samtec Inc.
Series - - - -
Contact Finish - Post (Mating) - - - -
Color - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Row Spacing - - - -
Termination - - - -
Length - Overall Pin - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Contact Finish Thickness - Post (Mating) - - - -
Length - Stack Height - - - -
Length - Tail - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Number of Positions - - - -
Number of Rows - - - -
Length - Post (Mating) - - - -
Pitch - - - -

DW-27-10-F-D-540 Datasheet PDF

Download DW-27-10-F-D-540 pdf datasheets and Samtec Inc. documentation for DW-27-10-F-D-540 - Samtec Inc..

Datasheets
DW/EW/ZW Drawing Sheet 1.pdf DW,EW,ZW,HW Series Datasheet.pdf

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Samtec Inc.

DW-27-10-F-D-540

Samtec Inc.
98D-DW-27-10-F-D-540

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