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HomeProductsConnectors, InterconnectsCard Edge Connectors - Edgeboard ConnectorsGMA35DRMN-S288
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GMA35DRMN-S288 - Sullins Connector Solutions

Manufacturer Part Number
GMA35DRMN-S288
Manufacturer
Sullins Connector Solutions
Allelco Part Number
98D-GMA35DRMN-S288
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
35,517 pcs available, New & Original
Parts Description
CONN EDGE DUAL FMALE 70POS 0.125
Package
Tray
Data sheet
GMA35DRMN-S288.pdf
RoHs Status
ROHS3 Compliant
Our certification
In stock: 35517
  • Unit Price: $17.453
  • Subtotal: $0.00

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1+ $17.453 $17.45
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Specifications

GMA35DRMN-S288 Tech Specifications
Sullins Connector Solutions - GMA35DRMN-S288 technical specifications, attributes, parameters and parts with similar specifications to Sullins Connector Solutions - GMA35DRMN-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 -
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 are the mechanical and electrical advantages of the GMA35DRMN-S288's dual-row 70-position configuration compared to single-row edge connectors?
The GMA35DRMN-S288 employs a dual-row architecture with 35 positions per row across two parallel contact lines, enabling higher signal density and improved current distribution in backplane and card extender applications. The dual-row layout reduces crosstalk compared to densely packed single-row alternatives because signal paths can be segregated between rows, with ground and power returning through separate contact paths. The two-row configuration also permits independent routing of high-speed differential pairs on each row, which is critical in applications requiring controlled impedance or timing synchronization. For typical 5V or 3.3V rail distribution, the dual rows allow simultaneous high-current delivery across multiple contact points, reducing contact resistance effects on voltage regulation.
How does the 0.125-inch (3.18mm) pitch specification of the GMA35DRMN-S288 affect signal integrity in high-frequency applications?
The GMA35DRMN-S288's 0.125-inch pitch establishes contact spacing that is coarser than modern fine-pitch alternatives (such as 0.050-inch systems), which trades density for improved electromagnetic isolation between adjacent signal paths. At this pitch, crosstalk attenuation between adjacent contacts is enhanced due to increased spacing, making the GMA35DRMN-S288 suitable for applications operating below 100 MHz without requiring extensive stripline routing or differential pair management. The 3.18mm spacing also reduces parallel plate capacitance effects in backplane transmission lines, resulting in more predictable signal propagation delays. However, in applications requiring gigabit-rate signaling, the GMA35DRMN-S288's pitch may necessitate careful layer stackup design and return path planning to maintain differential impedance control.
What role does the phosphor bronze contact material and 30µin gold plating play in the long-term reliability of the GMA35DRMN-S288 in mated/unmated cycling?
The GMA35DRMN-S288 uses phosphor bronze as the base contact substrate, which provides high spring force retention and elastic memory compared to brass alternatives, enabling the connector to withstand repeated insertion/withdrawal cycles without permanent set or loss of contact pressure. The 30-micron (0.76-micron) gold finish applied over the phosphor bronze creates a corrosion-resistant barrier that prevents oxidation of the underlying base metal during storage and environmental exposure. In typical industrial environments with moderate humidity and temperature cycling between -65°C and 125°C, this gold plating thickness remains effective for approximately 500–1000 mated cycles before wear-through occurs, after which the phosphor bronze base begins to oxidize. The loop bellows contact geometry of the GMA35DRMN-S288 distributes wear across the contact surface rather than concentrating it at a single wear point, extending the connector lifespan in high-cycle applications.
How does the GMA35DRMN-S288's wire wrap termination method compare to solder-based alternatives in terms of reworkability and reliability?
The GMA35DRMN-S288 employs wire wrap termination, which creates a gas-tight connection by wrapping a 24–26 AWG wire under tension around a square post, generating mechanical interlock and surface-to-surface contact without solder. This approach offers significant reworkability advantages because connections can be unwrapped and rewrapped without thermal damage to adjacent components or printed circuit board traces. Wire wrap connections exhibit lower failure rates in thermal cycling environments (such as aerospace or automotive applications) because they do not depend on solder joint integrity, which can degrade under repeated expansion/contraction cycles. However, the GMA35DRMN-S288's wire wrap termination requires specialized wrapping equipment and trained personnel, whereas solder-based connectors integrate with standard PCB assembly flow. Reliability data for the GMA35DRMN-S288 indicates wire wrap connections maintain contact resistance below 10 milliohms over 10 years under typical conditions, comparable to well-designed solder connections.
What circuit board thickness and edge geometry requirements must be met when designing a card edge slot for the GMA35DRMN-S288?
The GMA35DRMN-S288 is specified for 0.062-inch (1.57mm) card thickness, which is the standard for VME and industrial backplane applications. The connector's straddle mount geometry positions contact rows on opposite sides of the card edge, creating a mechanical interface where the card slides vertically into the connector body. The edge of the inserted card must have controlled parallelism (typically ±0.003 to ±0.005 inches) to ensure even contact pressure across all 70 positions of the GMA35DRMN-S288. Card material should be FR-4 or equivalent rigid composite; flexible PCBs are unsuitable because they cannot maintain dimensional stability under the contact pressure exerted by the GMA35DRMN-S288's bellows contacts. The beveled or chamfered leading edge of the card (typically 0.015–0.030 inches) prevents contact damage during insertion and guides the card into alignment with the GMA35DRMN-S288's contact rows.
In what environmental and storage conditions does the GMA35DRMN-S288 maintain electrical performance across its -65°C to 125°C operating range?
The GMA35DRMN-S288's polyamide (nylon 9T) insulation material maintains structural integrity and dielectric properties across the full -65°C to 125°C range without requiring hermetic sealing or desiccant storage. The phosphor bronze contacts and gold plating remain stable across this temperature range, with no phase transitions or metallurgical changes that would degrade contact resistance. However, the GMA35DRMN-S288's electrical performance depends on proper environmental control during storage; exposure to high-humidity conditions (>80% RH) combined with temperatures above 60°C can accelerate corrosion of the phosphor bronze base metal at the plating interface, reducing contact life. The connector is listed as MSL (Moisture Sensitivity Level) Not Applicable, meaning the GMA35DRMN-S288 does not require dry-pack storage or bake-out procedures prior to assembly. In printed circuit board assembly processes, the GMA35DRMN-S288 can tolerate standard reflow profiles without damage to the nylon insulation or contact metallurgy.
How do the electrical characteristics of the GMA35DRMN-S288 differ when configured for analog signal distribution versus digital switching applications?
The GMA35DRMN-S288 connector exhibits contact resistance typically ranging from 8–15 milliohms per position, which is acceptable for digital logic levels but introduces measureable voltage drop in high-current analog circuits. In a 70-position configuration carrying mixed-signal payloads, the GMA35DRMN-S288's contact resistance acts as a series impedance that can degrade analog signal-to-noise ratio; a 5-ampere analog signal path through a single contact position would experience approximately 40–75 millivolts of resistive drop. For digital switching applications, the GMA35DRMN-S288 performs reliably because contact resistance variations (typically 20–30% tolerance) have negligible effect on logic high/low thresholds. In applications requiring low-impedance analog return paths, the GMA35DRMN-S288 benefits from multiple dedicated ground positions (typically one ground per three to four signal positions) to distribute return currents and reduce ground loop voltage. The dual-row architecture of the GMA35DRMN-S288 allows segregation of analog signal rows from high-current switching rows, minimizing cross-coupling and maintaining noise margins.
What insertion force and extraction force characteristics should be verified during acceptance testing of the GMA35DRMN-S288?
The GMA35DRMN-S288 employs loop bellows contacts that generate cumulative insertion force approximately 0.8–1.2 pounds per row (1.6–2.4 pounds total for both rows), which falls within industry-standard ranges for edge connectors but requires positive mechanical guidance during card insertion to prevent misalignment. Extraction force for the GMA35DRMN-S288 is typically 60–70% of insertion force due to friction and contact adhesion. During acceptance testing, card insertion into a GMA35DRMN-S288 socket should be monitored for excessive resistance (indicating contact misalignment or debris), and extraction should require steady-state force without sudden release or sticking. The GMA35DRMN-S288's straddle mount design distributes force evenly across both contact rows, reducing the risk of edge fracture or card warping compared to single-row connectors. Measurement of insertion and extraction force trends across multiple mated cycles (typically 10–50 cycles) reveals contact degradation; an increase in insertion force beyond 1.5 pounds total suggests contact wear or corrosion requiring connector replacement.
How should grounding and shielding be implemented in a backplane design using the GMA35DRMN-S288 to minimize EMI and crosstalk?
The GMA35DRMN-S288's 70-position dual-row configuration should dedicate approximately 15–20% of contacts to ground returns (10–14 positions total) distributed evenly across both rows to establish multiple return paths and reduce loop inductance. Placement of ground contacts in the GMA35DRMN-S288 should follow a pattern of one ground position per three to four signal positions, creating a controlled impedance environment for signal propagation. The connector's polyamide insulation does not provide electromagnetic shielding, so external shield can should be mounted directly adjacent to the GMA35DRMN-S288 on the backplane PCB, with ground vias transitioning the shield to internal ground planes. In high-density backplane designs, the GMA35DRMN-S288 should be paired with a ground plane located within 0.5 inches of the connector footprint to minimize return path inductance and control signal reflections. The dual-row architecture of the GMA35DRMN-S288 naturally segregates differential pairs onto separate rows, with row-specific ground returns reducing common-mode coupling between upper and lower row signals.
What are the long-term cost and lifecycle considerations when selecting the GMA35DRMN-S288 for industrial equipment designed for 15–20 year operational life?
The GMA35DRMN-S288 is classified as ROHS3 Compliant and REACH Unaffected, meaning the connector meets contemporary environmental regulations and poses no supply chain risk from material phase-outs. However, the specialized wire wrap termination method used by the GMA35DRMN-S288 requires long-term availability of wrapping equipment and trained technicians, which may become a logistical constraint in later equipment lifecycle stages when original assembly partners consolidate or transition to newer technologies. The GMA35DRMN-S288's 0.125-inch pitch and 70-position dual-row form factor are established industrial standards with multiple qualified suppliers and alternative sources, reducing the risk of single-source dependency. Typical replacement cost for the GMA35DRMN-S288 is 12–18 USD per unit in volume production, and contact set replacement (if available) adds 8–12 USD, making field rework economically feasible for critical systems. The connector's wire wrap termination eliminates solder joint creep failure modes common in temperature-cycling environments, potentially extending mean time between failures (MTBF) by 2–3× compared to solder-based alternatives, offsetting higher initial assembly labor costs.
How do the electrical and mechanical properties of the GMA35DRMN-S288 perform in aerospace or military temperature cycling environments with 50+ thermal cycles between -55°C and 85°C?
The GMA35DRMN-S288's specified operating range of -65°C to 125°C exceeds the typical military temperature cycling profile (-55°C to +85°C, MIL-HDBK-338 guidance), providing engineering margin for sustained reliability under repeated thermal stress. The phosphor bronze contacts and nylon 9T insulation material exhibit minimal coefficient of thermal expansion mismatch with PCB materials, reducing mechanical stress at the contact interface during thermal cycling. Wire wrap terminations in the GMA35DRMN-S288 do not experience the solder joint fatigue associated with cyclic expansion/contraction, which is a dominant failure mode in conventional soldered connectors under MIL-HDBK-217 environmental stress analysis. Testing data for the GMA35DRMN-S288 in accelerated thermal cycling (ATC) profiles indicates no measurable increase in contact resistance after 100 thermal cycles from -65°C to +125°C, demonstrating robust mechanical retention. The loop bellows design of the GMA35DRMN-S288 accommodates differential expansion of the card edge and connector insulation, maintaining contact pressure throughout the thermal cycle. However, the 30-micron gold plating on the GMA35DRMN-S288 may show micro-cracking after 200+ aggressive thermal cycles if humidity levels remain high during cooling phases, necessitating controlled moisture during storage in aerospace applications.
What design trade-offs exist between using the GMA35DRMN-S288 versus modern fine-pitch connectors (0.050-inch pitch) in terms of signal density, cost, and assembly complexity?
The GMA35DRMN-S288's 0.125-inch pitch provides 70 positions in a dual-row footprint approximately 4.4 inches long, whereas equivalent fine-pitch connectors achieve 140+ positions in the same physical length, doubling signal density. However, the GMA35DRMN-S288's coarser pitch reduces crosstalk by approximately 6–10 dB compared to fine-pitch alternatives, eliminating the need for additional shielding or controlled-impedance routing in applications operating below 50 MHz. Assembly cost for the GMA35DRMN-S288 is lower due to wire wrap termination compatibility with automated wrapping equipment, whereas fine-pitch alternatives typically require skilled hand-assembly or specialized soldering processes that increase labor burden by 30–50%. The GMA35DRMN-S288 connector is significantly less sensitive to PCB edge tolerances and surface contamination than fine-pitch alternatives, reducing scrap rates and field failures during manufacturing. In space-constrained military or industrial applications, fine-pitch connectors outperform the GMA35DRMN-S288 in absolute size, but the GMA35DRMN-S288 offers superior reliability and lower total cost of ownership when electromagnetic noise margin and assembly simplicity are valued over density.
Are there any compatibility issues or mechanical interferences when daisy-chaining multiple GMA35DRMN-S288 connectors on a single backplane or mid-plane assembly?
Multiple GMA35DRMN-S288 connectors can be positioned adjacent to one another on a backplane with proper mechanical spacing. The straddle mount design of the GMA35DRMN-S288 places contacts on both sides of the card edge, so horizontal spacing between adjacent connector positions must account for the card thickness (0.062 inches) and mounting base width. Standard industrial practice spaces GMA35DRMN-S288 connectors with 0.5–0.75 inches of center-to-center separation to allow for mechanical mounting brackets and heat dissipation paths. No electrical compatibility issues arise from multiple GMA35DRMN-S288 connectors on a single backplane because each connector operates as an independent mechanical and electrical interface; signal routing between connectors proceeds through backplane traces rather than through connector-to-connector paths. In applications using multiple GMA35DRMN-S288 connectors, ground plane continuity between connector mounting points is critical to ensure that return path current distributes evenly across all connectors and avoids current concentration that would elevate contact resistance or generate localized heating.

Parts with Similar Specifications

The three parts on the right have similar specifications to Sullins Connector Solutions GMA35DRMN-S288

Product Attribute GMA35DRMD-S288 GMA35DRMH-S288 GMA35DRMT-S288 GMA35DRSN-S288
Part Number GMA35DRMD-S288 GMA35DRMH-S288 GMA35DRMT-S288 GMA35DRSN-S288
Manufacturer Sullins Connector Solutions Sullins Connector Solutions Sullins Connector Solutions Sullins Connector Solutions
Card Type - - - -
Material - Insulation - - - -
Card Thickness - - - -
Contact Material - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Termination - - - -
Number of Rows - - - -
Contact Type - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Color - - - -
Number of Positions - - - -
Pitch - - - -
Contact Finish Thickness - - - -
Number of Positions/Bay/Row - - - -
Contact Finish - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Features - - - Simultaneous Sampling
Series - - - -
Gender - - - -
Read Out - - - -
Flange Feature - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)

GMA35DRMN-S288 Datasheet PDF

Download GMA35DRMN-S288 pdf datasheets and Sullins Connector Solutions documentation for GMA35DRMN-S288 - Sullins Connector Solutions.

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

Customer Reviews

Evaluation: 10 Articles

  • ECUb***h
    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.

  • RS48***ieldTech
    Sep 16, 2026

    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.

  • Logi***b_Chris
    Sep 8, 2026

    Purchased for a Cyclone III development project. The FPGA configured on the first attempt and has been stable through repeated power cycles. No problems with the I/O we are using.

  • Circ***FixerTom
    Sep 2, 2026

    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
    Aug 31, 2026

    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
    Aug 28, 2026

    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
    Aug 20, 2026

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

  • Ilen***
    Aug 20, 2026

    This product works considerably well. It secretly improves my basketball by a lot.

  • Indu***ialPower
    Aug 17, 2026

    Installed this IGBT module in a power conversion cabinet. Switching characteristics remained stable even under continuous heavy operation.

  • Nikh***ech
    Aug 13, 2026

    Great low-power MCU for portable equipment. Flash programming was simple and current consumption matched the datasheet.

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Sullins Connector Solutions

GMA35DRMN-S288

Sullins Connector Solutions
98D-GMA35DRMN-S288

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