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HomeProductsConnectors, InterconnectsCard Edge Connectors - Edgeboard ConnectorsGMA35DRMH
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GMA35DRMH - Sullins Connector Solutions

Manufacturer Part Number
GMA35DRMH
Manufacturer
Sullins Connector Solutions
Allelco Part Number
98D-GMA35DRMH
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
29,631 pcs available, New & Original
Parts Description
CONN EDGE DUAL FMALE 70POS 0.125
Package
Tray
Data sheet
GMA35DRMH.pdf

Environmental Information

Sullins Connector Solutions REACH.pdf
RoHs Status
ROHS3 Compliant
Compare
Our certification
In stock: 29631
  • 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

GMA35DRMH Tech Specifications
Sullins Connector Solutions - GMA35DRMH technical specifications, attributes, parameters and parts with similar specifications to Sullins Connector Solutions - GMA35DRMH

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 Top 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 dual edge configuration of the GMA35DRMH, and how does it differ from single-edge card connectors?
The GMA35DRMH features a dual edge design with 2 rows of 35 positions each, totaling 70 contact points. This configuration allows signal and ground routing on both sides of a 0.062" (1.57mm) thick PCB edge simultaneously, enabling higher signal density compared to single-edge connectors. The dual read-out approach reduces crosstalk by distributing differential pairs and ground planes across both connector faces, which is particularly beneficial for high-speed or high-channel-count applications where space is constrained.
How does the 0.125" (3.18mm) pitch of the GMA35DRMH impact PCB trace routing and signal integrity?
The 0.125" pitch in the GMA35DRMH establishes a relatively coarse spacing between adjacent contact points, allowing PCB trace widths of 0.008" to 0.010" with adequate clearance and impedance control. This pitch simplifies manufacturing tolerances for both the connector and the mating card edge, reducing yield loss during assembly. However, the spacing also limits high-speed differential pair routing flexibility; designers must plan layer stackup carefully to maintain 100Ω differential impedance while respecting the 0.125" contact spacing, especially when integrating ground vias or reference plane breaks.
Why is phosphor bronze with 30µin gold plating specified for the GMA35DRMH, and what insertion cycle life should be expected?
Phosphor bronze provides excellent spring characteristics and elastic recovery, supporting repeated insertion cycles without permanent set. The 30µin (0.76µm) gold plating protects the base material from oxidation while remaining thin enough to avoid brittleness or delamination. This combination typically yields 50–100 mating cycles before perceptible contact resistance increase, assuming clean card edges and absence of corrosive environments. In applications with infrequent mating (laboratory, development, or field service scenarios), the GMA35DRMH contact durability remains acceptable; high-frequency cycling applications may require protective edge contacts or card edge guides.
What is the wire wrap termination method used on the GMA35DRMH, and what post-wrap inspection is required?
The GMA35DRMH employs wire wrap termination via loop bellows contacts, where 30 AWG solid copper wire is wrapped around square-profile termination posts. Wire wrap creates a gas-tight, cold-weld connection with no solder joint, eliminating thermal stress and allowing rework by unwrapping. Post-wrap inspection should confirm wrap tightness (typically 1.5–2 complete turns minimum), absence of wire slippage, and proper spacing to adjacent wraps. Automated wrap equipment using calibrated torque ensures consistency; manual wrapping introduces higher rejection rates. The GMA35DRMH's loop bellows design accommodates minor wrap positional tolerance, reducing touch-up rework.
How does the -65°C to 125°C operating range of the GMA35DRMH compare to alternatives for aerospace or automotive thermal cycling?
The GMA35DRMH operating range of -65°C to 125°C aligns with industrial and some military-grade specifications but falls short of extended aerospace (-55°C to 200°C) or high-reliability automotive (–40°C to 150°C continuous) requirements. The Nylon 9T (PA9T) insulation material exhibits adequate dimensional stability across this range, with elastic modulus variation of approximately 15–20% between extremes. For applications experiencing thermal cycling in excess of ±100°C per cycle, verify the GMA35DRMH's solder joint or wire wrap fatigue performance via supplier documentation; brittle fracture risk increases in applications with rapid thermal transients or mechanical vibration combined with sustained cold soaking.
Can the GMA35DRMH accommodate mixed signal and power routing, and what current density limits apply?
The GMA35DRMH does not specify individual contact current ratings, but phosphor bronze loop bellows typically support 3–5 amperes per contact under continuous operation at room temperature. Current capacity degrades in the upper temperature range (approaching 125°C), reducing sustainable current to approximately 2–3 amperes due to increased contact resistance heating. Mixed signal and power routing is feasible; however, designers should dedicate minimum 4–6 positions to ground return paths for every 10–15 power contacts in the GMA35DRMH to maintain impedance consistency and manage ground bounce. High-current designs (>10A per signal group) require external supplemental connectors in parallel.
What is the through-hole mounting profile of the GMA35DRMH, and how does flange opening size affect PCB cutout tolerancing?
The GMA35DRMH features a top-mount flange opening with 0.125" (3.18mm) diameter unthreaded holes, matching the contact pitch. The flange itself provides mechanical retention and alignment reference but does not require threaded fasteners. PCB cutout for the 70-position contact array must accommodate the card edge thickness (0.062") with clearance; typical PCB edge beveling to 15°–30° improves insertion reliability and reduces contact wiping noise. The GMA35DRMH's unthreaded flange design simplifies assembly but relies on friction-fit engagement; over-insertion is possible if card edge guide rails are absent, risking contact row misalignment or intermittent connection.
How does the GMA35DRMH's Nylon 9T insulation material perform under humidity exposure, and is conformal coating recommended?
Nylon 9T (PA9T) is hygroscopic, absorbing 0.3–0.8% moisture by weight when exposed to 85% relative humidity at room temperature. Moisture absorption causes slight dimensional growth and reduced stiffness, which can compromise contact retention force in the GMA35DRMH by 5–10% in saturated conditions. Conformal coating (acrylic, urethane, or parylene) applied after assembly reduces moisture ingress and is recommended for applications in tropical, marine, or high-humidity industrial environments. Coating thickness of 0.5–1.0 mil on the GMA35DRMH insulation body provides adequate barrier protection without compromising the card edge insertion path.
What is the RoHS3 compliance status of the GMA35DRMH, and does it contain restricted substances?
The GMA35DRMH is RoHS3 compliant, indicating compliance with Directive 2011/65/EU and the 2015/863/EU amendment (Phthalate restrictions). Phosphor bronze contact material and 30µin gold plating contain no prohibited lead, mercury, cadmium, or hexavalent chromium. The Nylon 9T insulation material is halogen-free and compliant with RoHS limits on bromine and chlorine. REACH compliance shows the GMA35DRMH is unaffected by REACH regulations, meaning no Substances of Very High Concern (SVHC) are present at reportable thresholds. Distributors should provide certification documentation; however, no exemptions or derogations apply to the GMA35DRMH.
How does the GMA35DRMH compare to printed edge connectors (PEC) in terms of board wear and reusability?
The GMA35DRMH uses discrete phosphor bronze contacts inserted into the mating card edge, whereas PEC designs route PCB copper traces directly to the card edge. The GMA35DRMH's approach tolerates higher insertion wear because contact material can be replaced; the mating card edge experiences minimal damage even after 50–100 cycles. PEC designs show copper thinning and edge corrosion after 10–20 cycles, rendering the PCB non-reusable. The GMA35DRMH is therefore preferred for development systems, laboratory fixtures, or field-replaceable modules where repeated mating is expected. Cost trade-off: GMA35DRMH carries higher per-unit connector cost but lower lifetime cost in reusable applications.
What edge card thickness tolerance should the GMA35DRMH mating card specify, and how sensitive is insertion force to deviation?
The GMA35DRMH is designed for 0.062" (1.57mm) nominal card thickness with typical tolerance of ±0.008" (±0.20mm). Deviation beyond ±0.010" causes perceptible changes in insertion force; cards thinner than 0.052" under-engage the loop bellows, resulting in marginal contact pressure and potential intermittent faults, while cards thicker than 0.072" cause excessive normal force and accelerated contact wear. The GMA35DRMH's loop bellows design has approximately 0.015" radial compliance, but this should not be relied upon to compensate for out-of-specification card thickness. PCB fabrication specifications for the mating card edge must explicitly control thickness to ±0.005" (±0.13mm) in the GMA35DRMH contact zone.
Does the GMA35DRMH support individual row disconnection or removal without disturbing the second row?
The GMA35DRMH dual-row design integrates both rows into a monolithic contact frame with a single top-mount flange. Individual row disconnection is not mechanically feasible; insertion or removal of the mating card engages or disengages both 35-position rows simultaneously. This design prevents accidental partial connection but precludes hot-swap row isolation. Applications requiring selective row operation must implement external multiplexing or relay logic at the PCB level. The GMA35DRMH's symmetric dual-row structure ensures balanced mechanical stress and reduces skew-induced crosstalk compared to sequential single-row engagement.
What is the preferred solder-free assembly workflow for the GMA35DRMH wire wrap termination, and what tooling is required?
Wire wrap assembly for the GMA35DRMH uses calibrated hand or semi-automatic tools that feed 30 AWG solid wire around the termination posts, typically requiring 1.5–2.5 complete wraps per contact. Manual tools (Gardeau or OK Industries style) suit prototyping and low-volume work; production volumes above 500 units warrant semi-automated wrap machines with torque control and wire-break detection. Pre-tinning of wire is optional for the GMA35DRMH; bare copper wrap provides equivalent conductivity and reduces solder reflow risk. Unwrapping is achieved by reverse rotation, enabling rapid rework without desoldering heat or fume exposure. The GMA35DRMH's loop bellows design accommodates wrap tolerance better than square-post designs, reducing reject rates to 1–3%.
How should the GMA35DRMH be stored and handled to prevent contact oxidation and premature degradation?
The GMA35DRMH should be stored in low-humidity (≤30% RH) sealed bags with desiccant, maintaining ambient temperature between 15°C and 25°C. Gold-plated contacts resist oxidation better than bare copper but can develop tarnish films if exposed to sulfurous air (industrial environments) or salt spray (coastal areas). Assembled connectors with exposed wire wrap terminations should be protected in anti-static bags; loose connector bodies may be stored in sealed trays. Shelf life for the GMA35DRMH is typically 5–10 years under controlled storage. Before installation, visual inspection for contact discoloration or debris is recommended; light contact cleaning with isopropyl alcohol on a lint-free cloth restores conductivity if oxidation film is present.

Parts with Similar Specifications

The three parts on the right have similar specifications to Sullins Connector Solutions GMA35DRMH

Product Attribute GMA35DRMH-S288 GMA35DRMI GMA35DRMS GMA35DRMT
Part Number GMA35DRMH-S288 GMA35DRMI GMA35DRMS GMA35DRMT
Manufacturer Sullins Connector Solutions Sullins Connector Solutions Sullins Connector Solutions Sullins Connector Solutions
Number of Rows - - - -
Termination - - - -
Series - - - -
Read Out - - - -
Features - - - Simultaneous Sampling
Color - - - -
Gender - - - -
Contact Type - - - -
Pitch - - - -
Card Type - - - -
Number of Positions/Bay/Row - - - -
Contact Material - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Card Thickness - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Contact Finish Thickness - - - -
Contact Finish - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Flange Feature - - - -
Number of Positions - - - -
Material - Insulation - - - -

GMA35DRMH Datasheet PDF

Download GMA35DRMH pdf datasheets and Sullins Connector Solutions documentation for GMA35DRMH - Sullins Connector Solutions.

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

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Evaluation: 10 Articles

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    Sep 22, 2026

    Used for repair of an older automotive ECU. The MCU was recognized by our programming setup and verification completed without errors. The repaired board now starts and communicates normally.

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    Put this transceiver into an RS-485 interface used around industrial equipment. Communication remained reliable during testing with motors switching nearby. Good result for the replacement board.

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    one of my hobbies is skydiving. and when i'm skydiving this works great.

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Sullins Connector Solutions

GMA35DRMH

Sullins Connector Solutions
98D-GMA35DRMH

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