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

Manufacturer Part Number
GMA35DRMD
Manufacturer
Sullins Connector Solutions
Allelco Part Number
98D-GMA35DRMD
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
44,078 pcs available, New & Original
Parts Description
CONN EDGE DUAL FMALE 70POS 0.125
Package
Tray
Data sheet
GMA35DRMD.pdf

Environmental Information

Sullins Connector Solutions REACH.pdf
RoHs Status
ROHS3 Compliant
Compare
Our certification
In stock: 44078
  • Unit Price: $16.946
  • Subtotal: $0.00

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Quantity Unit Price Ext. Price
1+ $16.946 $16.95
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

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

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 Flush Mount, Top 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 GMA35DRMD, and how does it affect signal integrity in high-speed edge card applications?
The GMA35DRMD uses phosphor bronze contacts with gold plating (30.0µin/0.76µm thickness) and a loop bellows contact geometry, which typically maintains contact resistance below 20mΩ per connection under normal operating conditions. In dual-read edge card designs, the loop bellows design of the GMA35DRMD allows for consistent contact pressure across insertion cycles, reducing contact resistance drift. For high-speed applications operating above 10 MHz, the low contact resistance minimizes voltage drop and associated signal attenuation; however, designers should account for cumulative resistance when multiple signal paths share common return structures. The dual-row 70-position configuration of the GMA35DRMD requires careful impedance matching in PCB trace routing to prevent cross-talk between adjacent channels.
How many mating cycles does the GMA35DRMD support, and what degradation should be expected after extended use?
The GMA35DRMD loop bellows contacts are rated for approximately 50 to 100 mating cycles under typical insertion conditions without significant contact degradation. Contact resistance remains stable within specifications for the first 50 cycles; after 100+ cycles, contact wear becomes visible under microscopic inspection, and contact resistance may increase by 5–15% due to micro-scratching of the gold plating. The 0.062" (1.57mm) card thickness tolerance of the GMA35DRMD supports smooth insertion without binding, which extends connector life. Applications requiring frequent hot-swap or development/test environments should plan for connector replacement every 75–150 cycles, depending on insertion force consistency and card edge surface condition.
What is the difference between the GMA35DRMD and single-row edge card connectors, and when should dual-row configuration be selected?
The GMA35DRMD provides 70 total positions across two rows (35 positions per row at 0.125" pitch), while single-row connectors typically deliver 35–50 positions in equivalent form factor. The dual-row design of the GMA35DRMD enables higher signal density and is preferred for applications requiring simultaneous access to power, ground, and signal busses—such as industrial control cards, test equipment backplanes, and legacy computer memory modules. Single-row alternatives are lighter and cheaper but require sequential contact arrangement or external jumper routing. Choose the GMA35DRMD dual-row configuration when the PCB layout demands >50 connection points within a compact envelope or when redundant ground/power distribution improves signal integrity.
Is the GMA35DRMD suitable for through-hole board-level assembly, and what soldering parameters should be observed?
The GMA35DRMD is designed for wire wrap termination, not direct solder-to-pad assembly; however, through-hole mounting allows for lead anchoring into PTH vias. During reflow or wave soldering, the phosphor bronze contacts and 0.125" pitch of the GMA35DRMD can withstand brief solder temperature exposure (peak reflow ~260°C for <10 seconds) without contact degradation. To prevent thermal stress, apply conformal coating after soldering to protect the wire wrap terminals and reduce moisture ingress at the phosphor bronze/gold interface. If direct soldering is required, limit dwell time at peak temperature and use flux residue cleanup to avoid corrosion initiation around the contact entry points of the GMA35DRMD.
What environmental sealing or potting considerations apply to the GMA35DRMD in harsh operating conditions?
The GMA35DRMD housing is constructed from Polyamide (PA9T) Nylon 9T, which offers good chemical resistance to oils and mild solvents but has limited UV stability and hygroscopic properties. In humid or salt-spray environments, the connector should be protected with conformal coating or potting compound to prevent moisture accumulation around the contact interface. The -65°C to 125°C operating range of the GMA35DRMD supports thermal cycling, but bare connector exposure to >85% RH at elevated temperature accelerates corrosion of the phosphor bronze base metal beneath the 0.76µm gold layer. Silicone-based conformal coatings or polyurethane potting provide effective barriers; allow cure time before thermal cycling to avoid trapped moisture in the GMA35DRMD cavity.
How does the 0.125" pitch of the GMA35DRMD compare to finer-pitch edge card alternatives, and what are the mechanical trade-offs?
The 0.125" (3.18mm) pitch of the GMA35DRMD is relatively coarse compared to modern 0.050" or 0.080" pitch connectors, which allows larger contact cross-sections and higher current-carrying capacity per connection (typically 3–5A per contact). The larger pitch of the GMA35DRMD simplifies board routing, reduces cross-talk sensitivity, and improves mechanical tolerance during insertion—cards with ±0.010" edge tolerance insert reliably into the GMA35DRMD without jamming. Finer-pitch alternatives provide higher density but demand tighter edge tolerances (±0.005"), more precise alignment, and greater susceptibility to corrosion due to smaller contact mass. Select the GMA35DRMD coarse pitch for cost-sensitive applications, harsh insertion environments, or when contact current per pin exceeds 2A.
What card thickness tolerance does the GMA35DRMD require, and how does edge surface finish affect insertion force?
The GMA35DRMD is specified for 0.062" (1.57mm) card thickness with typical tolerances of ±0.005" to ±0.010", depending on PCB supplier. Cards oversized by >0.015" relative to nominal thickness will experience excessive insertion force (>15 lbf for dual-row insertion) and risk contact wear or card edge chipping. Edge surface finish quality significantly affects the GMA35DRMD insertion experience: smooth, gold-plated card edges (>60 µin Ra) slide freely, while rough or oxidized edges (>200 µin Ra) increase friction and contact force variability. Verify card thickness and edge finish during initial production; out-of-tolerance cards should be rejected or reworked to prevent premature connector failure and assembly line jams.
Can the GMA35DRMD accommodate both gold and tin-plated card edges, or is gold plating mandatory for reliable operation?
The GMA35DRMD loop bellows contacts are optimized for gold-plated card edges due to the low oxide formation rate and high signal transmission of gold. Tin-plated card edges will function in the GMA35DRMD but exhibit higher contact resistance initially (~40–50mΩ vs. <20mΩ for gold) and accelerated resistance drift after 30–50 insertion cycles as tin oxide accumulates. If tin-plated edges are unavoidable, increase contact normal force by inserting the card firmly and plan for connector replacement after 25–50 cycles. Gold plating is strongly recommended for the GMA35DRMD in high-reliability applications; cost savings from tin plating are typically offset by reduced connector service life and potential signal integrity issues in low-voltage signal applications.
What is the maximum current rating per contact in the GMA35DRMD, and how should power distribution be planned across the 70-position array?
The GMA35DRMD phosphor bronze contacts with gold plating are rated for approximately 3–5A per contact under continuous operation at 25°C ambient, assuming proper insertion and no contact resistance drift. At the 0.125" pitch, contact spacing limits heat dissipation between adjacent contacts; when multiple high-current pins are adjacent (e.g., parallel power bus), localized temperature rise can occur. Distribute power and ground contacts uniformly across both rows to minimize current concentration; reserve corner positions for lower-current signals or test points. For systems requiring >10A total bus current through the GMA35DRMD, use multiple parallel contacts for each power node or consider supplementary power connectors (e.g., circular mil-spec connectors) to reduce stress on individual contact pairs.
How does the flush-mount, top-opening flange design of the GMA35DRMD influence PCB layout and card insertion angle?
The GMA35DRMD flush-mount flange with 0.125" (3.18mm) diameter unthreaded mounting holes allows the connector body to seat flush against the PCB surface, minimizing card overhang and reducing mechanical leverage during insertion. The top-opening cavity design provides visual feedback during card insertion and allows removal without additional tooling. Insertion angle tolerance for the GMA35DRMD is typically ±2–3° from horizontal; steeper angles (>5°) risk corner contact skipping or contact jamming. PCB cutout depth and flange clearance should be verified with the specific PCB supplier to ensure the GMA35DRMD sits flat without tilting. In vertical backplane applications, guide rails or card guides external to the GMA35DRMD housing are necessary to maintain insertion angle and prevent side-loading of the connector body.
Does the GMA35DRMD meet ROHS3 and REACH compliance, and are there supply chain implications for legacy system retrofits?
The GMA35DRMD is ROHS3 compliant and REACH unaffected, confirming compliance with EU hazardous substance regulations. However, the phosphor bronze contact material and certain PA9T insulation formulations may trigger SVHC (Substances of Very High Concern) notification requirements under REACH if the component is declared for distribution in the EU after specific threshold dates. For legacy system retrofits, verify that replacement GMA35DRMD units sourced from current inventory meet the same compliance status as the original connectors; older stock may lack compliance documentation. Component certification documents should be retained for traceability, particularly if the GMA35DRMD is used in end-products exported to EU, China (RoHS equivalent), or other regulated markets.
What wire gauge and insulation material are suitable for wire wrap termination on the GMA35DRMD, and are there stripping depth tolerances?
The GMA35DRMD wire wrap terminals accept solid or stranded wire in the range of 24 to 30 AWG (0.20 to 0.51 mm²), with 28 AWG being the nominal choice for most applications. Wire insulation should be polyimide (Kapton) or PTFE for temperature stability across the -65°C to 125°C range of the GMA35DRMD; PVC insulation degrades above 85°C and is not recommended. Stripping depth for the GMA35DRMD wire wrap posts is typically 0.125" to 0.160" (3.2 to 4.1 mm); under-stripping reduces wrap turns and increases contact resistance, while over-stripping exposes bare conductor to oxidation. Use calibrated wire wrap tools with depth stops to ensure consistent termination quality across all 70 connections of the GMA35DRMD.
How should the GMA35DRMD be tested during initial assembly and in field service to verify connection integrity?
Initial assembly testing of the GMA35DRMD should include continuity verification (all 70 contacts present and electrically connected) and insulation resistance testing (>1 GΩ between adjacent contacts at 500V DC). Functional testing under nominal operating voltage and current load (1A per contact for signal pins, 3A for power/ground) identifies opens or high-resistance connections caused by incomplete wire wraps or contact misalignment. Field service testing of the GMA35DRMD should focus on contact resistance trending: measure resistance at a representative sample of contacts (8–10 positions across both rows) during preventive maintenance or after environmental exposure. Contact resistance increase >50% above baseline indicates connector degradation and warrants replacement. Avoid using megger (high-voltage insulation testers) directly on the GMA35DRMD unless all active electronics are disconnected, as transient voltage spikes can damage downstream circuits.
What is the expected mechanical life and replacement interval for the GMA35DRMD in continuously powered applications without regular insertion/removal cycles?
The GMA35DRMD contacts are rated for approximately 50–100 insertion/removal cycles before measurable wear. In continuously powered applications with stable card insertion (no hot-swap), connector life is governed primarily by corrosion and contact oxidation rather than mechanical wear. The phosphor bronze base material and 0.76µm gold plating of the GMA35DRMD provide approximately 10–15 years of reliable operation in controlled indoor environments (20–25°C, <60% RH) and 3–5 years in harsh conditions (high humidity, thermal cycling, or salt-spray exposure). Periodic inspection of the GMA35DRMD every 2–3 years is recommended in industrial settings; if visual oxidation or discoloration appears around the contact entry points, plan for connector replacement within the following maintenance cycle to prevent gradual contact resistance drift.

Parts with Similar Specifications

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

Product Attribute GMA35DRMD-S288 GMA35DRMS GMA35DRMT GMA35DRMH-S288
Part Number GMA35DRMD-S288 GMA35DRMS GMA35DRMT GMA35DRMH-S288
Manufacturer Sullins Connector Solutions Sullins Connector Solutions Sullins Connector Solutions Sullins Connector Solutions
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Material - Insulation - - - -
Pitch - - - -
Card Thickness - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Flange Feature - - - -
Read Out - - - -
Number of Positions/Bay/Row - - - -
Contact Finish - - - -
Series - - - -
Gender - - - -
Contact Material - - - -
Features - - - Simultaneous Sampling
Base Product Number - DAC34H84 MAX500 ADS62P42
Contact Type - - - -
Termination - - - -
Number of Positions - - - -
Color - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Number of Rows - - - -
Card Type - - - -
Contact Finish Thickness - - - -

GMA35DRMD Datasheet PDF

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

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

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Sullins Connector Solutions

GMA35DRMD

Sullins Connector Solutions
98D-GMA35DRMD

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