Sullins GRPB122VWQS-RC 1.27 mm SMT Dual-Row Header

• Dense, low-profile 24-pin header: 1.27 mm pitch, dual row, vertical SMT for tight layouts.
• Rugged materials: UL94V-0 nylon insulator, gold-flash brass contacts, 1 A/pin.
• Production-friendly: clear Pin-1 marking, proven Sullins footprint geometry for VWQS style.

Sullins Connector Solutions GRPB122VWQS-RC Overview, Specifications & Applications

Sullins’ GRPB122VWQS-RC is a compact, high-reliability, dual-row, 24-pin (12 × 2) 1.27 mm-pitch surface-mount male header engineered for dense boards and mezzanine/board-to-board interconnects. As part of Sullins’ 0.050 in (1.27 mm) headers family, it combines a vertical SMT form factor with a low profile, making it ideal when you need robust signal connections without sacrificing routing space.

Under the hood, the part code tells the story:

• GRPB = Sullins 0.050 in (1.27 mm) contact-center header family.

• 12 = positions per row; 2 = dual-row (total 24 pins).

• VWQ = surface-mount termination style (SMT).

• S = dual-row SMT without guide posts (with guide posts would be “P”).

• -RC = RoHS-compliant finish.

Materials and finishes are tuned for reliability in production: a UL94V-0 nylon insulator, brass contacts with gold-flash overall plating, and a 1 A per-contact current rating. Sullins provides detailed dimensional drawings for the VWQ/VWQS style (e.g., pin size ≈ 0.40 mm square, typical SMT stack heights), plus a part-number key confirming the meaning of “G/R/P/B … VWQ + S/P” options. (See Sullins catalog pages 94–95 for the VWQ/VWQS drawings, materials, UL rating, and part-number options.)

In typical designs, GRPB122VWQS-RC drops onto standard 1.27 mm footprints and mates with corresponding dual-row sockets/connectors that share the pitch and row spacing. The –40 °C to +105 °C operating range and the gold-flash plating support dependable low-level signal mating cycles in industrial controls, embedded modules, test gear, and compact consumer/medical electronics (non-life-support).

Specifications

Notes on dimensions: Sullins provides A/B/C body length values indexed by “positions.” For 12 positions per row (dual-row 24 contacts), the catalog table lists A/B/C as shown above. Always confirm against the latest drawing before committing to a footprint.

Applications

1) Embedded systems and single-board computers
When you’re laying out carrier boards, compute modules, or daughtercards, a 1.27 mm dual-row header gives you plenty of signal density without jumping to ultra-fine 1.00 mm. GRPB122VWQS-RC’s vertical SMT style keeps the interconnect low-profile while still offering room to route breakouts between pads on typical 4-layer digital designs. The gold-flash brass contacts handle low-level logic I/O comfortably, and the 1 A contact rating provides margin for rails such as sensor power or LED strings (within thermal limits).

2) Industrial controls and instrumentation
PLC add-on cards, data loggers, and measurement modules often need compact, field-replaceable headers for test leads or cable assemblies. The UL94V-0 nylon housing and −40 °C to +105 °C range align with many industrial environment expectations, and the 1.27 mm pitch balances size and durability (vs. 2.54 mm). Mating cycles remain reliable thanks to gold-flash, especially in moderate-humidity environments.

3) Medical and lab equipment (non-life-support)
Benchtop analyzers and portable diagnostics benefit from dense board-to-board jumpers during development and service. The family’s clear Pin-1 mark minimizes assembly errors; the VWQS variant’s lack of guide posts reduces keep-out area near sensitive analog sections.

4) Test fixtures and programming headers
Program/debug headers, in-circuit test points, and temporary mezzanine links often standardize on 1.27 mm pitch to conserve board space. GRPB122VWQS-RC’s 24 contacts support multi-interface blends (e.g., SWD/JTAG + UART + power) on a single connector.

Design & integration notes

• Footprint & keep-out: For the VWQS style, Sullins’ drawings show typical pad spacing, lead size (~0.40 mm square), and overall height; use those to size solder mask, paste apertures, and mechanical keep-outs. If you require additional mechanical retention in shock/vibration environments, consider the VWQP (with guide posts) mechanical variant and add corresponding holes to the PCB.

• Stack height and clearance: The VWQS insulator height is ~5.10 mm above the PCB (typ.), with ~2.10 mm standoff; confirm with the mated connector to achieve your target mezzanine gap.

• Current and thermal planning: While the family is rated 1 A per contact, stay conservative when ganging multiple power pins, especially in warm enclosures. Consider copper plane area under the connector for heat spreading, and derate for ambient temperatures near the +105 °C ceiling.

• Plating and signal integrity: Gold-flash over brass is well-suited for low-level logic and moderate mating cycles. If your design sees frequent insertions/removals or corrosive atmospheres, check with Sullins for heavier gold options within the same family.

• Pin-1 orientation: The drawings show Pin-1 indicators for SMT variants. Align silkscreen triangles/dots and orient the mating cable/socket accordingly to minimize assembly risk.

Why choose GRPB122VWQS-RC?

• Space efficiency: Dual-row, 1.27 mm centers give you 24 signals in a very small footprint while preserving enough pad area for robust SMT solder joints.

• Ecosystem breadth: The same family includes straight and right-angle through-hole/SMT options (VWV, VWC, MWC, VWT, VWQ), plus guide-post choices for the dual-row SMT style (VWQS vs. VWQP). That makes it easy to spin board variants or evolve from prototyping jigs to production harnesses without re-qualifying a new supplier.

• Proven construction: Brass contacts, nylon insulator, UL94V-0 rating, and gold-flash plating are well-established materials and finishes for long-term availability and predictable solderability.

Ordering information & decoding help

• GRPB 122 VWQ S - RC

  • G = Insulator: Nylon; R = Contact: Brass; P = Finish: Gold flash overall; B = Contact centers: 0.050 in (1.27 mm).

  • 12 = 12 positions per row; 2 = dual row (24 pins total).

  • VWQ = surface-mount termination type; S = SMT without guide posts (dual-row only).

  • -RC = RoHS-compliant.
    Sullins’ part-number map on p. 95 of the catalog confirms these fields and shows how VWQP adds guide posts.

If you need a companion receptacle (female) for board-to-board or cable assemblies, select a mating 1.27 mm dual-row socket with compatible height and polarization. Verify mechanical stack with your housing and enclosure tolerances.

Typical industries and use cases

• Industrial & IIoT: compact controller boards, IO modules, small HMI add-ons.

• Communications: mini backplane jumpers, transceiver mezzanines, low-power radio modules.

• Measurement & test: fixture harnesses, probe heads, calibration boards.

• Medical/Consumer: portable analyzers, wearables dev-kits, battery-powered devices (non-life-support).

• Automotive dev benches: lab/jig boards for ECUs and sensor evaluation (non-vehicle production use unless separately qualified).

Quality & compliance

• UL94V-0 insulator for flammability performance.

• RoHS compliant (-RC).

• Family rated 1 A per contact; materials/finish per catalog.

• Sullins recommends contacting the factory for stacking options and any customizations (e.g., special plating or pin cuts) shown in the catalog family notes.