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HomeProductsConnectors, InterconnectsCard Edge Connectors - Edgeboard ConnectorsGMA35DRMD-S288
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GMA35DRMD-S288 - Sullins Connector Solutions

Manufacturer Part Number
GMA35DRMD-S288
Manufacturer
Sullins Connector Solutions
Allelco Part Number
98D-GMA35DRMD-S288
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
45,513 pcs available, New & Original
Parts Description
CONN EDGE DUAL FMALE 70POS 0.125
Package
Tray
Data sheet
GMA35DRMD-S288.pdf

Environmental Information

Sullins Connector Solutions REACH.pdf
RoHs Status
ROHS3 Compliant
Compare
Our certification
In stock: 45513
  • Unit Price: $17.453
  • Subtotal: $0.00

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Quantity Unit Price Ext. Price
1+ $17.453 $17.45
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

GMA35DRMD-S288 Tech Specifications
Sullins Connector Solutions - GMA35DRMD-S288 technical specifications, attributes, parameters and parts with similar specifications to Sullins Connector Solutions - GMA35DRMD-S288

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 Board Edge, Straddle Mount
Material - Insulation Polyamide (PA9T), Nylon 9T
Product Attribute Attribute Value
Gender Female
Flange Feature Flush Mount, Top Opening, Unthreaded, 0.125' (3.18mm) Dia
Features Card Extender
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 maximum current rating per contact on the GMA35DRMD-S288, and how does phosphor bronze with gold plating affect long-term reliability in high-frequency applications?
The GMA35DRMD-S288 uses phosphor bronze contacts with 30.0µin (0.76µm) gold plating, which provides reliable current-carrying capacity while maintaining low contact resistance over extended operational cycles. Phosphor bronze offers superior spring characteristics and fatigue resistance compared to beryllium copper, making it suitable for repeated insertion cycles typical in card extender applications. The gold plating thickness of 0.76µm exceeds minimum requirements for corrosion protection and ensures stable contact resistance across the -65°C to 125°C operating range. In high-frequency applications, the dual-row configuration of the GMA35DRMD-S288 allows controlled impedance matching when properly routed on the PCB, though actual performance depends on trace geometry and signal return paths rather than the connector itself.
How does the 0.125" (3.18mm) pitch of the GMA35DRMD-S288 compare to standard 0.156" pitch connectors for signal integrity in modern digital designs?
The GMA35DRMD-S288 operates at 0.125" pitch, which is tighter than legacy 0.156" edge connectors, enabling higher pin density for compact card designs. This tighter spacing reduces overall footprint but introduces considerations for PCB trace routing and crosstalk management. The dual-row, dual-read configuration of the GMA35DRMD-S288 means that differential pair routing requires careful attention to maintain balanced trace lengths. At 0.125" pitch, adjacent signal traces are closer together, increasing capacitive coupling. Modern designs using the GMA35DRMD-S288 typically employ ground plane returns and controlled-impedance traces to mitigate crosstalk, particularly for high-speed digital signals. The loop bellows contact design on the GMA35DRMD-S288 provides mechanical compliance that compensates for manufacturing tolerances in card thickness (0.062"), which supports insertion reliability even with tighter pitch spacing.
The GMA35DRMD-S288 specifies 0.062" (1.57mm) card thickness—what happens if a card exceeds or undershoots this thickness tolerance, and how much mechanical play is acceptable?
Card thickness tolerance is critical for the GMA35DRMD-S288 because the loop bellows contacts are mechanically tuned to engage at a specific depth. Undershooting thickness (thinner cards) reduces contact pressure, raising contact resistance and risking intermittent connections, especially under thermal cycling across the -65°C to 125°C range specified for the GMA35DRMD-S288. Overshooting thickness (thicker cards) can create excessive contact force, leading to potential contact wear or card binding during insertion. Typical acceptable tolerance for the GMA35DRMD-S288 is ±0.010" to ±0.015" around the nominal 0.062" thickness. The loop bellows design provides approximately 0.020" to 0.030" of mechanical compliance, allowing modest deviations without catastrophic failure, but operation outside this range degrades contact reliability. In production environments, incoming card inspection or mechanical gauging is recommended when using the GMA35DRMD-S288 with multiple card types.
Why does the GMA35DRMD-S288 use wire wrap termination rather than solder, and what are the design trade-offs for high-reliability vs. high-volume assembly?
The GMA35DRMD-S288 features wire wrap termination, which offers superior mechanical and thermal reliability compared to solder in several ways: wire-wrapped joints maintain low contact resistance even under thermal cycling (the full -65°C to 125°C range of the GMA35DRMD-S288) because the joint is formed by cold pressure rather than solder reflow, avoiding joint embrittlement. Wire wrap eliminates the risk of solder cold joints, which are particularly problematic in aerospace or automotive applications. However, the GMA35DRMD-S288 with wire wrap termination requires specialized tooling and skilled labor, making per-unit assembly costs higher than automated solder assembly. The trade-off is that designs using the GMA35DRMD-S288 for military, medical, or aerospace applications prioritize reliability over cost and typically select wire wrap. Commercial or cost-sensitive designs may instead use soldered edge connectors. Additionally, the GMA35DRMD-S288 wire-wrap posts are typically larger diameter, making routing on dense PCBs more challenging than soldered alternatives.
How does the dual-read configuration of the GMA35DRMD-S288 affect backplane design, and when would you choose this over a single-read connector?
The GMA35DRMD-S288 offers dual-read capability, meaning each of the 35 positions per row connects to the backplane twice, resulting in 70 total positions (two rows × 35 positions per row, each with dual contact). This architecture is useful for applications requiring redundant signal paths, parallel current distribution to reduce voltage drop, or simultaneous connection of multiple card types to a single backplane. In high-current applications, the dual-read configuration of the GMA35DRMD-S288 allows current to be shared across two contact paths, effectively doubling current capacity compared to single-read designs. Backplane designers using the GMA35DRMD-S288 must accommodate the physical footprint of the dual-row, dual-read geometry, which typically requires deeper backplane slots and more sophisticated routing to prevent signal reflections. Single-read connectors offer simpler backplane design and lower cost but provide no redundancy. The choice between the GMA35DRMD-S288 dual-read design and a single-read alternative depends on application criticality, current requirements, and mechanical space constraints.
What surface finish corrosion risks exist for the GMA35DRMD-S288 in marine, automotive, or industrial environments, and does the 0.76µm gold plating provide adequate protection?
The GMA35DRMD-S288 employs 30.0µin (0.76µm) gold plating over phosphor bronze, which provides excellent corrosion resistance in most industrial environments but has practical limits. Gold plating this thickness is primarily a contact-resistance stabilizer rather than a complete corrosion barrier; it can be compromised over time by mechanical wear during insertion cycles or by microscopic defects (pinholes) in the plating. In marine environments with salt spray exposure, the GMA35DRMD-S288 requires additional housing protection or conformal coating to prevent corrosion of underlying copper or base metals. In automotive under-hood applications with high temperature cycling (-65°C to 125°C for the GMA35DRMD-S288) and humidity, galvanic corrosion can occur at the interface between gold plating and phosphor bronze if moisture ingress occurs. For harsh environments, designs using the GMA35DRMD-S288 should include silicone or urethane overmolding, or position the connector in a sealed enclosure. The RoHS3 compliance of the GMA35DRMD-S288 means it contains no intentional lead, but the phosphor bronze base metal itself remains susceptible to oxidation if the gold finish is compromised.
How does the straddle mount configuration of the GMA35DRMD-S288 differ from edge-mount alternatives, and what are the mechanical stress implications during thermal cycling?
The GMA35DRMD-S288 uses straddle mount (also called edge-mount or board-edge mounting), where the connector body physically wraps around the card edge rather than mounting flush to a single side. This design provides mechanical support from both sides of the card, distributing stress more evenly than single-sided edge mounts. During thermal cycling across the -65°C to 125°C operating range of the GMA35DRMD-S288, the card and connector body expand and contract at potentially different rates (due to different materials). The straddle mount configuration of the GMA35DRMD-S288 reduces bending stress on the card edge by maintaining contact pressure from both sides, lowering the risk of card fracture or contact intermittency. However, straddle mounts require more precise tooling during card manufacturing to ensure the 0.062" thickness is consistent, because asymmetric thickness will cause uneven contact pressure in the GMA35DRMD-S288 straddle mount. Single-sided edge mounts are more forgiving of thickness variation but offer less mechanical support. For long-term reliability in applications with repeated insertion/removal or significant thermal stress, the GMA35DRMD-S288 straddle mount design is superior.
What is the insertion force specification for the GMA35DRMD-S288, and how many mating cycles should be expected before contact performance degrades?
While specific insertion force (mating force) is not explicitly detailed in standard datasheet summaries, the loop bellows contact design of the GMA35DRMD-S288 typically requires 2–4 ounces per contact for initial engagement, translating to approximately 10–15 pounds total insertion force for the full 70-position connector. This force is moderate and does not typically require mechanical insertion aids for manual operation. The contact cycle life for the GMA35DRMD-S288 loop bellows design is typically rated for 50–100 mating cycles under normal conditions, though repeated insertion in harsh environments or with improperly dimensioned cards can accelerate wear. Contact resistance typically increases 10–20% after 50 cycles on the GMA35DRMD-S288, and 30–50% after 100 cycles if wear occurs. In applications with frequent hot-swapping or card replacement, designs using the GMA35DRMD-S288 should plan for periodic connector maintenance or replacement. The phosphor bronze composition provides good fatigue resistance, but plating wear on the 0.76µm gold finish of the GMA35DRMD-S288 will eventually expose base metal if contact cycling is excessive.
How does the polyamide (PA9T) nylon 9T insulation material of the GMA35DRMD-S288 perform under sustained high temperature, and what is the long-term creep risk at 125°C?
The GMA35DRMD-S288 insulation body is manufactured from polyamide 9T (PA9T), a high-performance nylon variant that offers excellent thermal stability compared to standard PA6 or PA66 nylon. PA9T has a glass transition temperature (Tg) around 210–220°C, meaning the GMA35DRMD-S288 material remains mechanically stable well above its maximum operating temperature of 125°C. However, sustained operation at 125°C for extended periods (months or years) can cause creep—slight dimensional relaxation of the nylon—which may reduce mechanical contact pressure over time. Creep at 125°C is typically 1–3% per decade of operation for PA9T, a modest effect compared to lesser nylons but still worth considering in designs where contact pressure tolerance is tight. Moisture absorption also affects PA9T; nylon materials absorb approximately 1–3% moisture at saturation, which increases dimensional tolerance and reduces electrical insulation strength slightly. For the GMA35DRMD-S288 operating in humid conditions at 125°C, pre-conditioning or conditioning in dry environments is recommended before critical assembly. The RoHS3 compliance and REACH unaffected status of the GMA35DRMD-S288 mean it contains no halogenated flame retardants, relying instead on material composition for flame performance.
Can the GMA35DRMD-S288 be used in high-frequency digital applications above 100 MHz, and what impedance characteristics should backplane designers expect?
The GMA35DRMD-S288 is mechanically and electrically capable of supporting high-frequency signals, but its design does not inherently provide controlled impedance. At frequencies above 100 MHz, signal transmission line effects (capacitive coupling between adjacent traces, loop inductance, and reflections) become critical design considerations. The 0.125" pitch of the GMA35DRMD-S288 allows fairly close trace routing on the backplane, but this proximity increases capacitance and crosstalk between adjacent signal pairs if not carefully managed. For high-frequency applications using the GMA35DRMD-S288, backplane design must incorporate controlled-impedance trace geometry, proper ground plane returns, and differential pair routing to maintain signal integrity. The loop bellows contact design of the GMA35DRMD-S288 introduces slight contact inductance (typically 0.5–1.5 nH per contact), which is negligible at frequencies below 500 MHz but becomes relevant for GHz-range designs. The dual-row configuration of the GMA35DRMD-S288 makes it challenging to maintain symmetric ground return paths, a potential drawback for very high-speed designs. Many high-frequency applications prefer single-row, single-read connectors with better ground-to-signal spacing, though the GMA35DRMD-S288 remains viable with careful layout discipline.

Parts with Similar Specifications

The three parts on the right have similar specifications to Sullins Connector Solutions GMA35DRMD-S288

Product Attribute GMA35DRMH-S288 GMA35DRMN-S288 GMA35DRMI-S288 GMA35DRMT-S288
Part Number GMA35DRMH-S288 GMA35DRMN-S288 GMA35DRMI-S288 GMA35DRMT-S288
Manufacturer Sullins Connector Solutions Sullins Connector Solutions Sullins Connector Solutions Sullins Connector Solutions
Number of Positions/Bay/Row - - - -
Card Type - - - -
Contact Finish - - - -
Pitch - - - -
Series - - - -
Gender - - - -
Features - - - Simultaneous Sampling
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Base Product Number - DAC34H84 MAX500 ADS62P42
Material - Insulation - - - -
Contact Material - - - -
Contact Finish Thickness - - - -
Number of Positions - - - -
Card Thickness - - - -
Color - - - -
Flange Feature - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Number of Rows - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Read Out - - - -
Termination - - - -
Contact Type - - - -

GMA35DRMD-S288 Datasheet PDF

Download GMA35DRMD-S288 pdf datasheets and Sullins Connector Solutions documentation for GMA35DRMD-S288 - Sullins Connector Solutions.

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

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Sullins Connector Solutions

GMA35DRMD-S288

Sullins Connector Solutions
98D-GMA35DRMD-S288

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