Two 0.50 mm FPC Connectors, Two Tail Thicknesses

Freeze the exact receiving connector before drawing the tail

Ask the OEM board team for the connector manufacturer, full order number, current customer drawing and board-placement orientation. A family name may include different circuit counts, contact positions or dimensions. The same nominal pitch can also appear in housings with different actuator and cable-stack requirements. A converter should not infer the complete insertion end from the words '0.50 mm ZIF.'

Place the connector drawing alongside the flexible-tail artwork. Mark circuit one, insertion edge, contact face, exposed-contact length, width, pad pitch and any specified insertion depth. Distinguish the inserted mating zone from a thicker supported area elsewhere in the tail. If the housing, strain support or stiffener continues toward the connector, show where its edge falls relative to the connector mouth and the intended bend region.

Molex's FlatLock-90 data sheet identifies the 221378 series as a 0.50 mm, six-circuit right-angle connector with a 0.20 ± 0.03 mm FFC/FPC thickness specification. The 503480 FBH1 data sheet includes the six-circuit 5034800640 variant at 0.50 mm pitch and lists 0.30 mm nominal FFC/FPC thickness. Those figures describe the named Molex series, not every 0.50 mm connector or a membrane-switch standard.

Read the two customer drawings before comparing thickness

For order number 2213780067, Molex customer drawing 2213780001-SD Rev B, released July 3, 2025, lists six circuits and an applicable FPC thickness of 0.20 ± 0.03 mm. The arithmetic interval is 0.17–0.23 mm. It is the drawing's mating-FPC condition, not a measurement of an HYR tail or permission to use that connector in a specific application.

For order number 5034800640, Molex customer drawing SD-503480-003 Rev C, released February 27, 2023, lists six circuits. Its applicable FPC recommended dimension for 30 or fewer circuits gives thickness 0.30 ± 0.05 mm. For this six-circuit example, that interval is 0.25–0.35 mm. The lower end of the second listed window exceeds the upper end of the first by 0.02 mm. A shared pitch and six-position count therefore do not produce one common finished-tail thickness specification.

The drawing comparison is intentionally narrow. It does not say every tail outside either listed window will physically fail, and it is not a drop-in interchangeability analysis. The two connectors differ in other geometry and 0.90 versus 1.00 mm listed mated height. For a real project, the OEM must choose and control the actual part, read its current drawing, and have the responsible engineering team resolve all mating dimensions and validation criteria.

Specify finished thickness where the connector contacts the tail

A base-film callout does not equal the final stack at the insertion end. Conductors, coverlay openings, plating and a stiffener can change local thickness or geometry; the connector maker's drawing may also show a recommended layer structure. Name the layer stack and finished thickness at the actual mating zone, with its tolerance and measurement locations. Ask whether the quoted value includes the stiffener and whether any adhesive edge or burr intrudes on the exposed-contact zone.

Give the converter a controlled side-view and plan-view of the tail end rather than a pitch-only sketch. The plan view should define pad count, pitch, width, first-contact location, tail width and insertion edge. The side view should define contact face, finished stack, supported/stiffened region and bend or transition boundary. Keep dimensions tied to a datum and drawing revision so a change in adhesive, film or stiffener thickness does not silently change the accepted interface.

Molex's drawings illustrate why the details matter: the 221378 drawing includes a recommended FPC structure and warns against excess adhesive reaching the contact zone; the 503480 drawing also provides a recommended FPC structure and its own contact-related dimensional notes. These are the connector maker's examples, not a declaration that HYR uses those materials, a universal stack recipe or a substitute for the OEM's chosen-part drawing.

Turn the drawing into incoming and installed-sample evidence

Agree on the checking sequence before quoting an acceptance result. First, identify the connector and tail revisions and measure the finished insertion zone against the selected customer drawing and OEM-approved tolerance. Record the instrument or method, measurement points, sample identifiers and who can accept a deviation. A nominal film thickness alone is not an incoming mating-end measurement.

Then use representative connector and tail specimens in the intended board and housing arrangement. Observe insertion orientation, full seating and actuator closure without treating a visual latch as proof of electrical function. Apply only the project-selected handling and retention checks, and verify the required circuit map or continuity under the OEM's defined electrical conditions. If assembly or service will involve repeated mating, have the OEM and connector supplier decide whether a mating-cycle check is needed; do not turn a data-sheet durability rating into an HYR guarantee.

Finally, record the exact configuration that was observed: connector order number and revision, tail drawing and lot, board and housing revision, sample count, conditions, readings, exceptions and disposition owner. A pass on one mounted stack cannot be transferred automatically to a different stiffener, connector, contact face or enclosure route. The sequence is an HYR editorial buyer worksheet, not a released test protocol or evidence of an HYR production lot.

Challenge five realistic RFQ handoff gaps

These are hypothetical documentation and assembly risks, not observed HYR defects or customer cases. Each has a specific record or check that can resolve the question before an OEM accepts the interface.

• The RFQ says only 'six-pin, 0.50 mm ZIF.' Add the exact connector order number and current customer drawing; the two cited Molex examples already have different drawing-listed mating-end thickness windows.
• The drawing calls out a base-film thickness but not the finished inserted stack. Define and measure the complete local thickness, including the chosen stiffener and process tolerances, at the connector contact zone.
• A tail appears to enter a similar housing, so the quotation assumes contact compatibility. Confirm contact face, exposed length, pad position, insertion depth and actuator behavior against the chosen part's drawing on representative samples.
• An unmounted coupon passes continuity, so the assembled product is accepted. Check the controlled board/housing routing and required electrical state after insertion and latch closure under the OEM's conditions.
• The connector or stiffener changes without changing the RFQ title. Reissue the affected drawing and ask the designated OEM engineer whether incoming and mounted evidence must be repeated; do not transfer the earlier result by name alone.

Send one controlled tail-and-connector RFQ

Place the actual connector's manufacturer drawing beside the proposed membrane-switch tail drawing. Give every supplier the same circuit map, stack cross-section, insertion orientation, board/housing location and expected service or environmental conditions. Require returned quotations to identify assumptions and exclusions, including which party owns the connector, the tail-end dimensional evidence and the installed electrical confirmation.

Use the comparison matrix below as a question template, not as a selector between the two Molex products. The OEM must define numeric acceptance limits, measurement methods, sampling, connector substitution policy and approval authority for its design. If those inputs are open, flag them in the RFQ rather than describing a tail as 'connector ready' on pitch alone.

For an HYR engineering inquiry, send the controlled connector drawing and proposed tail/assembly documents through the secure RFQ. Ask for project-specific review of the material stack, mating-end geometry and sample plan. No public connector drawing or parent-company image proves that a particular HYR build has passed mating validation.