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HomeProductsConnectors, InterconnectsCard Edge Connectors - Edgeboard ConnectorsGMA35DRMT
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GMA35DRMT - Sullins Connector Solutions

Manufacturer Part Number
GMA35DRMT
Manufacturer
Sullins Connector Solutions
Allelco Part Number
98D-GMA35DRMT
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
41,263 pcs available, New & Original
Parts Description
CONN EDGE DUAL FMALE 70POS 0.125
Package
Tray
Data sheet
GMA35DRMT.pdf

Environmental Information

Sullins Connector Solutions REACH.pdf
RoHs Status
ROHS3 Compliant
Compare
Our certification
In stock: 41263
  • Unit Price: $18.311
  • Subtotal: $0.00

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Quantity Unit Price Ext. Price
1+ $18.311 $18.31
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

GMA35DRMT Tech Specifications
Sullins Connector Solutions - GMA35DRMT technical specifications, attributes, parameters and parts with similar specifications to Sullins Connector Solutions - GMA35DRMT

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, Threaded Insert, 4-40
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 are the key differences between the GMA35DRMT and single-row card edge connectors for dual-sided PCB edge applications?
The GMA35DRMT provides 70 total positions across two rows (35 per row) with 0.125" pitch spacing, enabling simultaneous dual-edge contact on both sides of a 0.062" thick PCB. Single-row alternatives require sequential edge insertion or backplane routing, increasing assembly complexity and PCB real estate demands. The GMA35DRMT's dual-row architecture allows balanced signal distribution across both PCB surfaces without intermediate interconnects, reducing trace congestion and improving high-speed signal integrity when both edges carry independent signal groups.
How does the 0.125" pitch specification of the GMA35DRMT affect layout density compared to finer-pitch alternatives?
The 0.125" (3.18mm) pitch of the GMA35DRMT yields approximately 8 positions per inch along the card edge. While coarser than 0.100" or 0.050" pitch connectors, this spacing simplifies hand soldering and wire-wrap assembly tolerances, reducing rework rates in low-volume or prototype environments. For applications requiring higher position density, such alternatives occupy less linear card-edge space but demand tighter PCB layout control, precision tooling, and higher termination labor costs. The GMA35DRMT's pitch represents an optimization point for manufacturing accessibility without sacrificing the 70-position capacity across dual rows.
What signal integrity considerations should guide trace routing when using the GMA35DRMT in mixed-signal applications?
The GMA35DRMT's dual-row, dual-read configuration with loop bellows contacts exhibits typical parasitic capacitance in the 3–6 pF range per contact pair, comparable to industrial-grade card-edge standards. For analog or precision measurement signals, routing from Row 1 and Row 2 separately allows ground-plane returns to be placed strategically between signal traces, reducing crosstalk coupling. High-speed digital signals (>50 MHz) benefit from grouping on a single row with adjacent ground contacts, leveraging the GMA35DRMT's flush-mount design to minimize stub lengths. The phosphor bronze contact material with 0.76 µm gold plating provides stable impedance across -65°C to 125°C operation, maintaining signal fidelity in thermal cycling scenarios common in industrial equipment.
How does the wire-wrap termination method of the GMA35DRMT compare to solder-cup or press-fit alternatives for field serviceability?
The GMA35DRMT employs wire-wrap termination using loop bellows contacts, enabling single-layer board designs without plated through-holes and reducing backside assembly footprint. Wire-wrap interconnects are fully reversible and field-removable using standard wrap/unwrap tools, making the GMA35DRMT suitable for reconfigurable test fixtures, prototyping environments, or legacy system retrofits. Solder-cup variants demand reflow infrastructure and create permanent joints; press-fit alternatives offer higher contact forces but require precision pin diameters and increase PCB mechanical stress. For applications demanding frequent reconfigurations—such as programmable backplanes or modular instrumentation—the GMA35DRMT's wire-wrap design avoids rework labor and solder-related reliability concerns.
What thermal and mechanical stress factors should be considered when specifying the GMA35DRMT for outdoor or vibration-prone installations?
The GMA35DRMT's operating range of -65°C to 125°C spans typical industrial and automotive environments, with the phosphor bronze contacts and PA9T nylon housing exhibiting stable dimensional and electrical properties across this span. Thermal cycling induces micromotion at wire-wrap joints; applications experiencing >2 G sustained vibration should incorporate secondary strain relief or potting to isolate the GMA35DRMT termination zone. The flush-mount, top-opening flange with 4-40 threaded inserts enables mechanical retention independent of electrical contact force, decoupling insertion stress from electrical performance. In high-vibration scenarios, the loop bellows contact design of the GMA35DRMT absorbs micromotion without fretting, whereas rigid or leaf-spring alternatives degrade more rapidly under cyclic stress.
How does the gold plating thickness (0.76 µm) on the GMA35DRMT affect long-term contact resistance stability and corrosion resistance?
The 30.0 µin (0.76 µm) gold finish on the GMA35DRMT provides corrosion barrier compliance for IPC Class 2 environments and reduces contact resistance drift during the initial 100–500 insertion cycles. However, this thickness is at the lower boundary for high-cycle applications (>1000 insertions); thinner platings accelerate base-metal corrosion in humid or corrosive atmospheres. For applications with infrequent insertion cycles (≤100), the 0.76 µm plating of the GMA35DRMT is adequate; applications with seasonal reconfiguration or field upgrades should evaluate thicker alternatives (2.0–5.0 µm) to mitigate long-term resistance creep. The phosphor bronze substrate provides inherent corrosion resistance, but once the gold barrier depletes, oxidation proceeds rapidly, increasing contact resistance by 50–200 mΩ per decade of insertion cycles.
What are the practical design trade-offs between the GMA35DRMT's 70-position capacity and smaller dual-row alternatives in terms of assembly time and cost?
The GMA35DRMT's 70-position configuration supports complete dual-edge signal sets for high-I/O modules, eliminating secondary connectors on the same PCB edge. A two-connector approach using 35-position alternatives introduces additional board-level assembly operations, connector footprint space (typically 0.5–1.0 square inches), and cable routing complexity. Wire-wrap assembly labor for the GMA35DRMT scales approximately linearly with position count; 70 positions typically require 15–25 minutes of skilled labor versus 8–12 minutes for 35-position variants. In applications requiring fewer than 50 net signals, the GMA35DRMT's full 70-position capacity remains underutilized; smaller alternatives reduce termination burden and enable more compact PCB designs. Conversely, for dense backplane applications, the single-connector simplicity of the GMA35DRMT justifies the assembly investment.
How should the GMA35DRMT be specified in design documentation to ensure supplier compatibility and manufacturing clarity?
The complete part number GMA35DRMT includes the base series (GMA35), dual-row configuration (D), and female termination designation (MT for wire-wrap posts). Design documentation should reference the GMA35DRMT with the card thickness specification (0.062") and pitch (0.125") to prevent substitution with non-conforming variants. The dual-read capability of the GMA35DRMT requires explicit signal mapping between Row 1 and Row 2 positions in schematics and assembly drawings; failing to differentiate rows often leads to miswiring during manual termination. When working with contract manufacturers unfamiliar with vintage card-edge assemblies, specifying GMA35DRMT alongside reference images of the flush-mount flange orientation and 4-40 threaded-insert retention reduces assembly defects.
Under what environmental conditions does the PA9T nylon housing of the GMA35DRMT require secondary encapsulation or potting?
The PA9T polyamide (Nylon 9T) housing of the GMA35DRMT maintains structural integrity and electrical insulation across -65°C to 125°C; however, exposed nylon is susceptible to moisture absorption in high-humidity (>85% RH) environments, which can reduce mechanical rigidity and increase dielectric loss at high frequencies (>100 MHz). Potting the GMA35DRMT wire-wrap termination zone with epoxy or silicone elastomer becomes necessary in marine, wash-down, or sealed-enclosure applications where condensation or chemical exposure is anticipated. Conversely, applications in controlled indoor environments or sealed electronic cabinets do not require potting; the GMA35DRMT's inherent design supports operation without additional protection. When potting is specified, ensure the GMA35DRMT's flange threads remain accessible for future mechanical removal.
What is the expected contact resistance range for the GMA35DRMT under typical insertion conditions, and how does it degrade with repeated cycles?
Fresh GMA35DRMT contacts exhibit 15–30 mΩ contact resistance at nominal insertion force, measured between wire-wrap post and bellows contact. After 50–100 insertion cycles, contact resistance typically stabilizes at 20–40 mΩ as the gold plating bedding process completes. Beyond 200 cycles, resistance degradation accelerates to 50–100 mΩ, particularly if insertion/removal occurs under load or at temperature extremes. The GMA35DRMT's loop bellows design maintains consistent contact force across insertion cycles, mitigating the rapid resistance rise seen in spring-finger alternatives. Applications using the GMA35DRMT for permanent connections should expect sub-50 mΩ resistance indefinitely; frequent reconfiguration or hot-plugging environments should budget for periodic contact resistance checks and possible connector replacement after 500+ cycles.
How does the flush-mount, top-opening flange of the GMA35DRMT influence PCB layout and backplane routing compared to edge-mount alternatives?
The GMA35DRMT's flush-mount flange positions the connector body at the card edge without protrusion, allowing adjacent components (resistor networks, decoupling capacitors, shielding cans) to occupy board real estate within 0.25–0.50 inches of the edge. The top-opening orientation enables smooth card insertion from above, simplifying mechanical guides and reducing insertion misalignment errors in confined spaces. Backplane routing benefits from the GMA35DRMT's dual-row, dual-read architecture; signal layers immediately behind the card edge can carry Row 1 and Row 2 signals independently, avoiding the layer-stacking constraints imposed by single-edge connectors. The 4-40 threaded inserts provide mechanical retention independent of electrical insertion force, enabling safe hot-swapping or field upgrades without stressing the connector's electrical integrity.
What electrical performance specifications should be verified during prototype validation of a GMA35DRMT-based backplane?
Initial prototype validation of the GMA35DRMT should confirm contact continuity across all 70 positions using low-current resistance measurement (≤100 mA) to detect assembly defects before high-power operation. Insertion force should be measured at the card edge (typically 8–12 pounds for full seating) to confirm uniform bellows engagement across both rows of the GMA35DRMT. For high-frequency applications, measure insertion loss and crosstalk between adjacent signal pairs using Time Domain Reflectometry (TDR) or network analysis; the GMA35DRMT's 70-position density occasionally exhibits 2–5 dB crosstalk between tightly spaced signals on the same row. Environmental testing should include thermal cycling (-65°C to 125°C, 5–10 cycles) followed by contact resistance re-measurement; contact resistance should not exceed 80 mΩ after cycling. If resistance exceeds this threshold, the GMA35DRMT sample or termination process requires re-evaluation.
How does the GMA35DRMT's RoHS3 compliance and REACH unaffected status simplify supply chain qualification for regulated markets?
The GMA35DRMT is RoHS3 compliant, meaning the connector housing, contacts, and plating conform to restricted substance limits (lead <1000 ppm, cadmium eliminated) and are suitable for direct sale into European Union and equivalent markets without substitution-design cycles. REACH unaffected status indicates the GMA35DRMT does not contain substances of very high concern (SVHC) above reporting thresholds, eliminating regulatory documentation burdens and supply-chain delays associated with material declarations. This compliance posture simplifies international design-in; the GMA35DRMT can be specified globally without regional variants, reducing bill-of-materials complexity and inventory management. However, RoHS3 compliance does not guarantee long-term material availability; contract manufacturers should confirm lead-time stability for the GMA35DRMT at qualification time.

Parts with Similar Specifications

The three parts on the right have similar specifications to Sullins Connector Solutions GMA35DRMT

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

GMA35DRMT Datasheet PDF

Download GMA35DRMT pdf datasheets and Sullins Connector Solutions documentation for GMA35DRMT - Sullins Connector Solutions.

Datasheets
.125 Female Card Edge Datasheet.pdf
Environmental Information
Sullins Connector Solutions REACH.pdf

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Customer Reviews

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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  • Circ***FixerTom
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    Used this rectifier in a high-current power supply repair. Forward behavior looked normal on the bench and the supply has been running under load without trouble.

  • Retr***UWorks
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    Needed the exact ST10F269Z2Q6 for servicing an older control unit. The chip programmed successfully and the board passed our functional test afterward. Much easier than redesigning around a newer MCU.

  • Andr***PCBLab
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    I needed this ADC for an older data acquisition board. Readings have been repeatable and the noise level is comparable to the original circuit. Happy with the purchase.

  • Leat***O'Keefe
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    one of my hobbies is skydiving. and when i'm skydiving this works great.

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1.00kg-2.00kg USD$40.00 - USD$80.00
2.00kg-3.00kg USD$50.00 - USD$100.00
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Sullins Connector Solutions

GMA35DRMT

Sullins Connector Solutions
98D-GMA35DRMT

Want a better price? Add to Cart and Submit RFQ now, we'll contact you immediately.

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