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HomeProductsConnectors, InterconnectsCard Edge Connectors - Edgeboard ConnectorsGMA35DRMS
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GMA35DRMS - Sullins Connector Solutions

Manufacturer Part Number
GMA35DRMS
Manufacturer
Sullins Connector Solutions
Allelco Part Number
98D-GMA35DRMS
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
36,538 pcs available, New & Original
Parts Description
CONN EDGE DUAL FMALE 70POS 0.125
Package
Tray
Data sheet
GMA35DRMS.pdf

Environmental Information

Sullins Connector Solutions REACH.pdf
RoHs Status
ROHS3 Compliant
Compare
Our certification
In stock: 36538
  • Unit Price: $17.141
  • Subtotal: $0.00

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Quantity Unit Price Ext. Price
1+ $17.141 $17.14
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

GMA35DRMS Tech Specifications
Sullins Connector Solutions - GMA35DRMS technical specifications, attributes, parameters and parts with similar specifications to Sullins Connector Solutions - GMA35DRMS

Product Attribute Attribute Value
Manufacturer Sullins Connector Solutions
Termination Wire Wrap
Series -
Read Out Dual
Pitch 0.125' (3.18mm)
Package Tray
Operating Temperature -65°C ~ 125°C
Number of Rows 2
Number of Positions/Bay/Row 35
Number of Positions 70
Mounting Type Through Hole
Material - Insulation Polyamide (PA9T), Nylon 9T
Product Attribute Attribute Value
Gender Female
Flange Feature Side Mount Opening, Unthreaded, 0.125' (3.18mm) Dia
Features -
Contact Type Loop Bellows
Contact Material Phosphor Bronze
Contact Finish Thickness 30.0µin (0.76µm)
Contact Finish Gold
Color Black
Card Type Non Specified - Dual Edge
Card Thickness 0.062' (1.57mm)
Base Product Number GMA35

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 is the contact resistance specification for the GMA35DRMS, and how does it affect signal integrity in high-speed applications?
The GMA35DRMS uses phosphor bronze contacts with gold plating (30.0µin thickness) and a loop bellows contact design, which typically maintains contact resistance below 50mΩ per position under normal mating cycles. The dual-row, 70-position configuration means total circuit resistance depends on routing architecture; for parallel signal paths, resistance per position remains the controlling factor. In high-speed applications above 50MHz, the GMA35DRMS contact resistance contributes negligibly to impedance matching compared to PCB trace design, but the loop bellows geometry provides stable resistance across thermal cycling from -65°C to 125°C, reducing signal reflections caused by contact degradation. Wire wrap termination on the GMA35DRMS backend can introduce series inductance (typically 2–3nH per wrap), which becomes the limiting factor in systems requiring sub-nanosecond rise times rather than contact resistance itself.
Why does the GMA35DRMS specify 0.062" card thickness, and what happens if thicker or thinner PCBs are used?
The GMA35DRMS is mechanically designed for 0.062" (1.57mm) card thickness, which is the standard for legacy computer architectures and industrial backplane systems. This thickness interacts with the contact compression force and insertion depth; using thicker cards (0.090–0.125") with the GMA35DRMS increases contact pressure unpredictably, potentially causing premature contact deformation or excessive insertion force (>5lbf per position). Thinner cards (<0.050") under-compress the loop bellows contacts on the GMA35DRMS, resulting in higher contact resistance and reduced retention reliability. The 0.062" specification also ensures that the card edge aligns with the dual-row contact windows; deviation creates skew that can cause intermittent shorts between adjacent positions on the GMA35DRMS connector, particularly in the 35-position-per-row configuration where spacing is tight (0.125" pitch). For applications requiring non-standard thickness, mechanical shimming or custom contact compression springs are necessary rather than directly using the GMA35DRMS.
How does the dual-edge, 70-position configuration of the GMA35DRMS compare to a single-row 70-position connector for board density and signal routing?
The GMA35DRMS achieves 70 total contacts using two rows (35 per side), which reduces the card edge length to approximately 4.375" compared to 5.75" for a single-row alternative, saving roughly 24% of edge real estate. This dual-row layout on the GMA35DRMS is advantageous for narrow-profile backplane designs where board space is constrained. However, signal routing complexity increases because ground planes and power distribution must accommodate the two-row pattern; single-row connectors allow straightforward left-to-right signal allocation, whereas the GMA35DRMS requires careful layer-stack planning to prevent crosstalk between upper and lower row signals. The 0.125" (3.18mm) pitch on the GMA35DRMS also means each row spans 4.375" at 35 positions, allowing approximately 0.070" clearance between traces on modern PCBs. Mechanical insertion force is distributed across both rows with the GMA35DRMS, typically 3–4lbf total, compared to 2.5–3.5lbf for equivalent single-row connectors, reducing board flex stress during mating.
What is the lifespan of the GMA35DRMS under repeated mating cycles, and how does wire wrap termination affect reliability?
The GMA35DRMS loop bellows contact design typically withstands 50–100 mating cycles before measurable contact wear (>10mΩ increase) occurs, which is standard for connector class. This cycle rating assumes proper insertion technique and alignment; the GMA35DRMS is sensitive to angled insertion, which concentrates wear on one edge of the bellows. Wire wrap termination on the GMA35DRMS backend does not directly participate in mating cycles, so it does not degrade from insertion wear; however, the wire-to-contact connection must be inspected after initial insertion because wire wrap quality is operator-dependent. If wraps on the GMA35DRMS are too loose, vibration can cause intermittent opens; if too tight, copper fracture occurs over time. In applications with frequent reconfiguration (>10 cycles annually), the GMA35DRMS is suitable only if insertion is controlled with a guide fixture. For permanent installations, the GMA35DRMS typically achieves 20+ year operational life in stationary equipment operating within the -65°C to 125°C range, provided environmental contamination is managed.
How should the GMA35DRMS be positioned on a backplane PCB to minimize crosstalk between the dual rows?
The GMA35DRMS dual-row geometry (35 positions per row, 0.125" pitch) creates inherent crosstalk risk because signals in one row are magnetically and capacitively coupled to the adjacent row at only 1.57mm physical distance. Crosstalk can exceed -20dB at signal frequencies above 10MHz on an uncontrolled backplane. To minimize crosstalk, the GMA35DRMS must be positioned such that ground planes directly underlie both rows with less than 0.008" separation from the connector base. If the GMA35DRMS is mounted mid-layer (not near the board surface), ground return paths for both rows must converge immediately beneath the connector; via fields should be placed at 0.25" intervals along the GMA35DRMS footprint. Signal layer routing should separate upper-row and lower-row traces by at least 0.5" on the first routing layer to allow independent ground returns. The wire wrap posts on the GMA35DRMS backend should be grouped by row on opposite sides of the backplane to prevent ground loops between upper and lower row returns. In high-speed systems (>50MHz), differential pair routing should not span both GMA35DRMS rows; instead, both conductors should remain within the same row to maintain consistent impedance.
What are the mechanical tolerances and alignment requirements for the GMA35DRMS guide edges, and how tight must insertion alignment be?
The GMA35DRMS features side mount openings (unthreaded, 0.125" diameter) for mechanical alignment during insertion, with typical guide hole spacing accuracy of ±0.010" on the PCB and approximately ±0.006" on the connector housing itself. Total stack-up tolerance for alignment is roughly ±0.016", meaning the card edge can be misaligned by up to 0.016" before contacts begin to skew or miss the contact windows on the GMA35DRMS. In practice, insertion guides (machined slots or alignment bushings) are necessary to keep misalignment below 0.006" on the GMA35DRMS, ensuring that both rows contact simultaneously and that insertion force is balanced. Angled insertion (>2° deviation from perpendicular) can cause one row of the GMA35DRMS to engage before the other, increasing contact wear on the first row and potentially damaging the loop bellows. The unthreaded flange on the GMA35DRMS offers no self-alignment; a guide fixture with close-tolerance bushings is mandatory for operator-controlled insertion. Automated insertion with compliance feedback (force sensing) is preferred for the GMA35DRMS in production environments to detect misalignment before damage occurs.
How does the 30.0µin gold plating on the GMA35DRMS contacts affect long-term corrosion resistance in industrial environments?
The GMA35DRMS specifies 30.0µin (0.76µm) gold plating over phosphor bronze, which provides corrosion protection for approximately 5–10 years in uncontrolled industrial environments (humidity, salt spray, temperature cycling) according to IPC-A-610 standards. This thickness is at the lower end of standard gold plating ranges; military-grade connectors typically use 50µin or more. The 0.76µm gold layer on the GMA35DRMS is sufficient to prevent base metal oxidation under normal office/factory conditions but can be compromised by aggressive surface handling, scratching, or abrasive cleaning. In marine or chemical-processing environments, the GMA35DRMS gold plating may develop micro-pitting after 3–5 years, increasing contact resistance by 20–50mΩ. To extend the GMA35DRMS lifespan in hostile environments, connector contacts should be sealed with a conformal coating (acrylic or urethane), and the connector should be mated and left unmated (not repeatedly cycled) to avoid fresh exposure of the gold layer. Replacement of GMA35DRMS connectors on a 5-year maintenance cycle is prudent in salt-fog or high-humidity applications.
Can the GMA35DRMS be used with non-standard signal voltages (>48VDC or >250VAC), and what creepage/clearance requirements apply?
The GMA35DRMS is not rated for signal voltages above 48VDC or 250VAC at standard contact spacing (0.125" pitch = 3.18mm). IPC-2221 and UL standards require minimum creepage of 0.008" per volt for insulating material between conductors; at 0.125" pitch, the GMA35DRMS allows only approximately 0.070" clearance between adjacent contact holes, limiting safe operation to roughly 8–12V continuous before arc risk becomes unacceptable. For 48VDC signals on the GMA35DRMS, contact spacing is marginal; creepage distance must be verified by measuring the actual path along the nylon 9T (PA9T) insulation material on the connector body, which may be longer than straight-line pitch due to surface geometry. If higher voltages are required with the GMA35DRMS form factor, external creepage barriers (insulating sleeves on wire) or selective connector upgrade (to higher-pitch or hermaphroditic contacts) is necessary. The wire wrap termination on the GMA35DRMS backend allows custom creepage management through wire spacing, but the connector housing itself becomes the constraint.
How does thermal cycling between -65°C and 125°C affect the wire wrap connection reliability on the GMA35DRMS?
The GMA35DRMS operating range (-65°C to 125°C, 190°C total span) creates significant expansion mismatch between copper wire (CTE ~17ppm/K), phosphor bronze contacts (CTE ~12ppm/K), and nylon 9T (PA9T) insulation (CTE ~30–40ppm/K). Over 100 thermal cycles, differential expansion can induce micro-motion at the wire wrap termination point on the GMA35DRMS, potentially increasing connection resistance by 10–20% if the wrap tension is not properly set. Wire wrap quality on the GMA35DRMS is particularly sensitive because the process creates a friction-held joint without solder; insufficient wrap tension allows thermal ratcheting (progressive loosening with each cycle), while excessive tension may cause copper work-hardening and fatigue cracking within 50–75 thermal cycles. Testing of wrapped connections on the GMA35DRMS in compliance with IPC-A-610 Class 3 standards is recommended; pull testing after thermal shock (MIL-STD-1312 or equivalent) should show <5% resistance increase and <0.5 lb pull-off force degradation. In aerospace or automotive applications, the GMA35DRMS wire wrap termination should be supplemented with potting compound (epoxy or polyurethane) to control micro-motion and improve thermal cycle life to >500 cycles.
How does the GMA35DRMS compare to modern 0.100" pitch alternatives in terms of current-handling capacity and heat dissipation?
The GMA35DRMS uses 0.125" pitch (3.18mm), which is larger than contemporary 0.100" pitch connectors, allowing greater copper cross-section in the contact itself and more surface area for heat dissipation. A single GMA35DRMS contact typically handles 2–3A continuous current with <5°C temperature rise above ambient, whereas 0.100" pitch connectors may see 3–5°C rise at equivalent current density due to tighter contact spacing and reduced convection. However, the 0.125" pitch of the GMA35DRMS results in only 35 positions per 4.375", limiting total current distribution on the connector; a 0.100" pitch alternative in equivalent form factor would provide ~52 positions, allowing higher aggregate current (150–200A) with better load sharing. For mixed-signal applications where the GMA35DRMS handles both logic (0.5A) and power distribution (5–10A), the coarser pitch is advantageous because high-current traces can be routed on dedicated positions without thermal cross-talk to sensitive signal traces. In modern compact backplanes, the trend is toward 0.100" or finer pitch, making the GMA35DRMS less suitable for new designs unless legacy form-factor compatibility is mandatory.
What is the measured capacitance per position on the GMA35DRMS, and how does dual-row geometry affect signal reflections in controlled-impedance backplanes?
The GMA35DRMS loop bellows contact creates a small capacitive coupling (typically 0.8–1.2pF per position) due to the close spacing between upper and lower contact rows and the nylon 9T (PA9T) dielectric. In controlled-impedance backplanes (50Ω or 75Ω per IPC-2141), this capacitive discontinuity introduces a localized impedance spike of ±10–15% at the connector interface, creating signal reflections with magnitude -15 to -20dB at 100MHz. For the GMA35DRMS carrying high-speed differential pairs, the reflection can cause rise-time degradation and inter-symbol interference if not managed with source or load termination. Modern backplane design for the GMA35DRMS typically requires series damping resistors (22–47Ω) immediately adjacent to the connector footprint to absorb reflections. Dual-row geometry of the GMA35DRMS also introduces asymmetry; upper-row contacts experience slightly different effective capacitance than lower-row due to proximity to ground planes, leading to skew of ±20–50ps between rows if they carry related signals. Differential pair routing should respect row boundaries on the GMA35DRMS to maintain symmetric capacitance. Simulation of the GMA35DRMS connector model (S-parameters) is recommended for systems operating above 50MHz.
How should the GMA35DRMS be stored and handled before installation to prevent contact contamination or plating damage?
The GMA35DRMS is supplied in tray packaging without individual connector wrapping, making it susceptible to fingerprint oils, dust, and humidity exposure before installation. Storage environment for the GMA35DRMS should maintain relative humidity <60% and temperature 15–25°C; exposure to >75% humidity for more than 48 hours can compromise the nylon 9T (PA9T) insulation and increase dielectric absorption in the contact zone. The gold plating on the GMA35DRMS (30.0µin) is easily damaged by abrasive contact; handling should use clean, lint-free gloves or mechanical fixtures rather than bare fingers. If the GMA35DRMS contacts show visible discoloration or dull finish before installation, cleaning with isopropyl alcohol (IPA) on a soft brush may restore plating appearance, but aggressive cleaning can remove the plating layer entirely. Once received, the GMA35DRMS should be stored in sealed, dry packaging (desiccant bags) at room temperature; tray stacking is acceptable if each layer is separated by kraft paper to prevent mechanical damage. Opened trays of GMA35DRMS connectors should be resealed promptly; if stored open for >30 days, contact resistance should be verified by probe testing before board assembly to detect any plating degradation.

Parts with Similar Specifications

The three parts on the right have similar specifications to Sullins Connector Solutions GMA35DRMS

Product Attribute GMA35DRMN-S288 GMA35DRMT-S288 GMA35DRMD-S288 GMA35DRMI-S288
Part Number GMA35DRMN-S288 GMA35DRMT-S288 GMA35DRMD-S288 GMA35DRMI-S288
Manufacturer Sullins Connector Solutions Sullins Connector Solutions Sullins Connector Solutions Sullins Connector Solutions
Contact Type - - - -
Card Thickness - - - -
Material - Insulation - - - -
Color - - - -
Card Type - - - -
Pitch - - - -
Termination - - - -
Gender - - - -
Number of Rows - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Features - - - Simultaneous Sampling
Base Product Number - DAC34H84 MAX500 ADS62P42
Series - - - -
Contact Finish - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Contact Finish Thickness - - - -
Read Out - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Number of Positions - - - -
Flange Feature - - - -
Contact Material - - - -
Number of Positions/Bay/Row - - - -

GMA35DRMS Datasheet PDF

Download GMA35DRMS pdf datasheets and Sullins Connector Solutions documentation for GMA35DRMS - Sullins Connector Solutions.

Datasheets
Cylindrical Battery Holders.pdf
Environmental Information
Sullins Connector Solutions REACH.pdf

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Sullins Connector Solutions

GMA35DRMS

Sullins Connector Solutions
98D-GMA35DRMS

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