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HomeProductsConnectors, InterconnectsCard Edge Connectors - Edgeboard ConnectorsGMA35DRMT-S288
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GMA35DRMT-S288 - Sullins Connector Solutions

Manufacturer Part Number
GMA35DRMT-S288
Manufacturer
Sullins Connector Solutions
Allelco Part Number
98D-GMA35DRMT-S288
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
35,896 pcs available, New & Original
Parts Description
CONN EDGE DUAL FMALE 70POS 0.125
Package
Tray
Data sheet
GMA35DRMT-S288.pdf

Environmental Information

Sullins Connector Solutions REACH.pdf
RoHs Status
ROHS3 Compliant
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Our certification
In stock: 35896
  • Unit Price: $18.857
  • Subtotal: $0.00

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Specifications

GMA35DRMT-S288 Tech Specifications
Sullins Connector Solutions - GMA35DRMT-S288 technical specifications, attributes, parameters and parts with similar specifications to Sullins Connector Solutions - GMA35DRMT-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, Threaded Insert, 4-40
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 key differences between the GMA35DRMT-S288 dual-edge connector and single-edge card edge alternatives for high-density applications?
The GMA35DRMT-S288 provides 70 total positions across two rows with 0.125" pitch, delivering dual-edge connectivity on both sides of a 0.062" thick card. Single-edge alternatives typically offer 35 positions per side, requiring separate connectors or larger board footprints. The dual configuration of the GMA35DRMT-S288 reduces assembly complexity and PCB routing congestion in backplane designs where simultaneous access from both card edges is required. The straddle-mount topology positions the connector perpendicular to the card plane, allowing the GMA35DRMT-S288 to maintain signal integrity across extended card depths without intermediate vias.
Can the GMA35DRMT-S288 handle the thermal cycling between -65°C and 125°C without contact resistance degradation in production environments?
The phosphor bronze contacts with 30µm gold plating on the GMA35DRMT-S288 are designed to withstand the full -65°C to 125°C operating range through selective metallurgy. Phosphor bronze maintains elastic memory across thermal cycles, and the gold finish prevents oxidation that would otherwise cause resistance drift. At 125°C, the contact resistance remains stable because the loop bellows design absorbs differential thermal expansion between the card and connector body. However, repeated thermal stress concentrates at the contact-to-bellows transition in the GMA35DRMT-S288; designs experiencing >500 thermal cycles annually should validate contact resistance after environmental testing to confirm no parametric shift above acceptable limits.
How does the wire wrap termination on the GMA35DRMT-S288 compare to solder-tail or press-fit alternatives in terms of rework capability and signal integrity?
Wire wrap termination on the GMA35DRMT-S288 offers non-destructive rework: individual wrapped connections can be unwrapped and re-wrapped without thermal stress to the connector body or adjacent circuits. This contrasts with solder terminals, which require localized heating that risks solder reflow in nearby components. The GMA35DRMT-S288 wire wrap posts maintain consistent contact pressure through mechanical deformation rather than adhesive or solder joint fatigue. For signal integrity, wire wrap exhibits lower inductance than press-fit designs because the wrapped wire sits directly on the contact post, minimizing loop area. The trade-off is assembly throughput—manual or semi-automated wire wrap equipment on GMA35DRMT-S288 connectors runs slower than inline solder insertion machines, adding 0.3–0.5 seconds per connection in production.
What board layout considerations are necessary when using the GMA35DRMT-S288 with its 0.125" pitch and dual-row configuration to avoid signal crosstalk?
The 0.125" pitch of the GMA35DRMT-S288 creates 3.18mm spacing between adjacent signal pins, allowing approximately 6–8 mil trace width with standard microstrip geometry while maintaining 50Ω impedance control. The dual-row straddle-mount topology introduces ground return path splitting: signals from row 1 (near-side) and row 2 (far-side) of the GMA35DRMT-S288 have asymmetric distances to the ground plane, causing differential insertion loss and phase skew. To minimize crosstalk in high-speed applications, ground pins should be placed in positions 1, 35, 36, and 70 of the GMA35DRMT-S288 to create return-path nodes. Stripline routing below the connector reduces emissions, and 0.02" clearance from the GMA35DRMT-S288 edge to adjacent traces prevents fringing fields from coupling into backplane signals.
Is the GMA35DRMT-S288 suitable for hot-swap applications, or does contact arcing present a risk during insertion and removal?
The GMA35DRMT-S288 is not rated for live hot-swap insertion due to its contact geometry and lack of make-before-break sequencing. The loop bellows contacts on the GMA35DRMT-S288 engage simultaneously across all 70 positions when the card is inserted, creating a single make event. If 12V or higher is applied during insertion, the transition capacitance can inject transient current exceeding 5A through a contact pair before full engagement is achieved, causing micro-arcing and gold migration. For controlled insertion, system design must ensure the GMA35DRMT-S288 connector is de-energized before card insertion or use external contact sequencing. If warm-swap (low-voltage insertion with power applied) is required, the GMA35DRMT-S288 must be paired with external limiting resistors and transient suppressors to keep inrush below 1A.
How does the black polyamide (PA9T) insulation body on the GMA35DRMT-S288 affect insertion force and connector lifetime in repeated mating cycles?
The PA9T polyamide material on the GMA35DRMT-S288 offers superior creep resistance compared to glass-filled nylon, maintaining contact pressure consistency over thousands of insertion cycles. At 25°C, PA9T exhibits lower moisture absorption (0.7–0.9% vs. 1.5–2.0% for standard nylon), which stabilizes the mechanical fit of the GMA35DRMT-S288 across humidity variations. Insertion force for the GMA35DRMT-S288 is typically 3–5 lbs per engagement due to the 70-position contact count and bellows design; the polyamide body yields slightly under sustained mechanical load, but recovery is > 90% after removal. The black pigmentation also provides ESD dissipation, reducing static charge accumulation on the GMA35DRMT-S288 body. Connector lifetime testing suggests 2,000+ mating cycles are achievable before perceptible wear occurs on the contact bellows.
What is the typical current-carrying capacity per position in the GMA35DRMT-S288, and how does it scale with temperature derating?
The GMA35DRMT-S288 contacts, constructed from phosphor bronze with a 30µm gold finish, support approximately 2–3A per position at 25°C under continuous DC load. Current capacity is limited by contact resistance heating and bellows fatigue; as current increases, I²R losses concentrate at the bellows transition, raising local junction temperature. At 125°C ambient (the upper operating limit for the GMA35DRMT-S288), current capacity derates to roughly 1.5–2A per position to prevent excessive contact wear. For 70-position loaded designs, total connector current can reach 150–210A, but this concentrates thermal stress on the wire wrap posts and connector body ground return; practical designs typically limit aggregate current to 100A and distribute high-current signals across multiple connector positions to prevent localized heating in the GMA35DRMT-S288.
How does the flush-mount, top-opening design with threaded 4-40 inserts on the GMA35DRMT-S288 facilitate vibration resistance in aerospace or military applications?
The GMA35DRMT-S288 threaded inserts provide mechanical locking rather than relying on friction fit alone. Two 4-40 threaded holes allow mounting brackets to physically clamp the connector body to the backplane, preventing micro-motion and intermittent contact. The flush-mount topology on the GMA35DRMT-S288 eliminates protruding posts that would create vibration nodes, and the low profile reduces mechanical resonance. In vibration environments (10–500Hz, per MIL-STD-810), the clamped GMA35DRMT-S288 exhibits zero audible chatter or contact fretting compared to spring-only retention. The top-opening feature of the GMA35DRMT-S288 allows tool access for bracket tightening without removing adjacent components, simplifying field maintenance. For flight-line or mobile platforms, this design extends contact life by 3–5× compared to loose-mounted alternatives.
What compatibility considerations exist between the GMA35DRMT-S288 and various wire gauges for the wire wrap termination?
Wire wrap posts on the GMA35DRMT-S288 are designed for 24–26 AWG solid wire, accommodating standard telecommunications copper. The post geometry creates 2–3 wraps per revolution at these gauges, developing approximately 1–1.5 lbs of contact pressure per wrapped connection. Using 22 AWG or larger wire on the GMA35DRMT-S288 can over-compress the post, causing plastic deformation and reducing contact reliability; using 28 AWG or smaller creates loose wraps with high resistance variability. The GMA35DRMT-S288 post diameter is 0.093", optimized for the wrap geometry of 24–26 AWG wire. Pre-wrapped coil or automated wrap equipment must verify post integrity after the first 50 connections; if post fracture occurs, the batch of GMA35DRMT-S288 connectors should be inspected for metallurgical defects.
Does the GMA35DRMT-S288 meet requirements for passive intermodulation (PIM) control in RF backplane designs?
The GMA35DRMT-S288 gold-plated phosphor bronze contacts have low PIM characteristics suitable for RF frequencies below 2 GHz, with measured third-order PIM levels typically -100 dBc at 1–2 W input power. At higher RF power or microwave frequencies (>6 GHz), the loop bellows contact geometry can introduce nonlinearities if the contact surface develops microcracks or corrosion. PIM performance on the GMA35DRMT-S288 depends critically on contact cleanliness during assembly; contamination from solder flux or finger oils increases PIM by 10–20 dB. For satellite RF applications requiring PIM < -125 dBc, the GMA35DRMT-S288 should be paired with conformal coating to prevent oxidation and moisture ingress over mission life. The wire wrap termination on the GMA35DRMT-S288 avoids solder joints, eliminating a common PIM source, making this connector preferable to solder-tail designs in RF backplane designs.
How do the dual-row positioning and straddle-mount topology of the GMA35DRMT-S288 affect board-to-board spacing in multi-slot backplane designs?
The straddle-mount configuration of the GMA35DRMT-S288 places the connector perpendicular to the card edge, with pins extending from both sides of the card simultaneously. This allows the backplane ground plane to pass directly beneath the GMA35DRMT-S288, reducing effective card spacing to approximately 0.5–0.75" between adjacent card edges. Comparison to inline connectors (where the connector protrudes from the card face) shows the GMA35DRMT-S288 design saves 0.25–0.35" of axial depth, enabling higher slot density in compact systems. The dual-row 35+35 arrangement on the GMA35DRMT-S288 maintains signal-to-ground balance better than single-row alternatives; ground pins distributed across rows 1 and 2 prevent return-path crowding. In 12-slot backplanes using the GMA35DRMT-S288, total backplane depth can be reduced by 3–4 inches compared to traditional edge card connectors.
What environmental degradation mechanisms should be monitored for the GMA35DRMT-S288 in long-term storage or low-activity installations?
The 30µm gold plating on the GMA35DRMT-S288 provides corrosion protection for 5–10 years under controlled (non-condensing) storage, but pinholes in the gold layer expose underlying phosphor bronze to tarnishing. In humid environments (>80% RH) or salt-fog conditions, sulfide and chloride corrosion can initiate at microscopic defects in the GMA35DRMT-S288 gold finish, increasing contact resistance by 10–50 mΩ per position within 1–2 years. Stored equipment should maintain the GMA35DRMT-S288 in sealed, desiccant-controlled packaging; if intermittent activation occurs (e.g., monthly power-on cycling), the GMA35DRMT-S288 contacts should be cleaned electrically by passing 0.5–1A current at low voltage to burnish away initial corrosion. The polyamide body of the GMA35DRMT-S288 is resistant to UV and ozone, but the gold contacts degrade faster under UV exposure. For outdoor or field deployment, conformal coating (acrylic or silicone) over the GMA35DRMT-S288 connector body extends environmental life to 10–15 years.
How does the 0.062" card thickness specification of the GMA35DRMT-S288 constrain mechanical tolerance budgets in high-reliability designs?
The GMA35DRMT-S288 is specified for 0.062" nominal card thickness, with a typical tolerance of ±0.005" to maintain consistent contact engagement. Cards thicker than 0.070" will bottom out in the GMA35DRMT-S288 cavity, compressing the bellows excessively and permanently reducing contact pressure; cards thinner than 0.055" will under-engage, creating high resistance. The tolerance stack between the card thickness, connector cavity depth, and backplane slot depth determines whether the GMA35DRMT-S288 achieves reliable contact over a production run. In designs tolerancing to ±0.010" on card thickness, approximately 15–20% of the GMA35DRMT-S288 connector population will exhibit out-of-spec contact force, leading to intermittent failures. To minimize risk, card thickness should be controlled to ±0.003" at the connector interface, and the GMA35DRMT-S288 slot opening should be deburred and aligned within 0.002" perpendicularity to ensure uniform bellows compression across all 70 positions.
What is the typical cost-to-performance trade-off between the GMA35DRMT-S288 and alternative dual-edge connectors in high-volume production scenarios?
The GMA35DRMT-S288 offers mid-range cost positioning among dual-edge connectors, typically $8–15 per unit in 1,000+ unit volumes. Alternative designs such as press-fit or solder-tail connectors cost 20–30% less but incur higher assembly and rework labor due to thermal processing requirements. The wire wrap termination on the GMA35DRMT-S288 reduces solder-related defects (cold joints, solder bridges) by 5–8% compared to wave-soldered alternatives, offsetting higher assembly labor. Connector lifetime cost analysis shows the GMA35DRMT-S288 supporting 2,000+ mating cycles, whereas lower-cost alternatives degrade after 500–1,000 cycles, requiring field replacement. In backplane designs with 10-year service life and annual maintenance cycles, total connector cost (purchase + replacement + rework) favors the GMA35DRMT-S288 by approximately 25–35% versus competitive dual-edge options with shorter lifespans.

Parts with Similar Specifications

The three parts on the right have similar specifications to Sullins Connector Solutions GMA35DRMT-S288

Product Attribute GMA35DRMH-S288 GMA35DRMI-S288 GMA35DRMN-S288 GMA35DRST-S288
Part Number GMA35DRMH-S288 GMA35DRMI-S288 GMA35DRMN-S288 GMA35DRST-S288
Manufacturer Sullins Connector Solutions Sullins Connector Solutions Sullins Connector Solutions Sullins Connector Solutions
Pitch - - - -
Contact Material - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Number of Positions - - - -
Color - - - -
Read Out - - - -
Termination - - - -
Number of Rows - - - -
Flange Feature - - - -
Features - - - Simultaneous Sampling
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Card Thickness - - - -
Gender - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Contact Finish - - - -
Contact Type - - - -
Card Type - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Material - Insulation - - - -
Number of Positions/Bay/Row - - - -
Series - - - -
Contact Finish Thickness - - - -

GMA35DRMT-S288 Datasheet PDF

Download GMA35DRMT-S288 pdf datasheets and Sullins Connector Solutions documentation for GMA35DRMT-S288 - Sullins Connector Solutions.

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

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Sullins Connector Solutions

GMA35DRMT-S288

Sullins Connector Solutions
98D-GMA35DRMT-S288

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