TQFP-32 7×7 mm Footprint: DFM, Layout, and Assembly Guide

TQFP-32 7×7 mm is a gull wing package used for surface mount assembly, also seen labeled 32-TQFP, 7 mm square QFP, 0.8 mm-pitch QFP. A dependable footprint follows the exact orderable-device drawing rather than the family name: nominal body 7.0 × 7.0 mm nominal, overall span About 9.0 mm including leads, seated height Typically 1.0–1.2 mm, pitch 0.8 mm, pin count 32; 8 per side, and exposed pad None on standard TQFP.

Encode body size, lead span, pitch, and pin count in the footprint name; QFP-32 alone is ambiguous.

Typical uses include microcontrollers, educational boards, mixed-signal control. TQFP-32 commonly exists in 7 × 7 mm, 0.8 mm-pitch form, but exact lead dimensions and height follow the selected package code.

• Eight 0.8 mm-pitch gull-wing leads per side are visually accessible and hand-reworkable, but the 9 mm overall lead span controls placement.
• Gull-wing package names cover families of drawings; body width, lead span, lead length, and seated height must all match the orderable part.

Fan each side by peripheral bank, place clock and bypass parts at their pins, and keep a continuous return plane beneath digital signal groups.

• Route away from the lead toe, preserve visible solder fillets, and keep the pin-one cue unambiguous on copper, silkscreen, and the assembly drawing.

Hand assembly is rated moderate. Stencil reflow or flux-rich drag soldering. Watch for bent corner leads and confusing 7 mm with smaller 5 mm body variants.

• Protect protruding leads during handling and keep nearby tall parts outside the drag-solder and inspection path.
• Use symmetric paste apertures and a real component courtyard so placement does not rotate or crowd neighboring parts.
• Do not lengthen every pad for hand soldering on the production footprint; excessive toe extension consumes routing and can increase solder movement.

Inspection focus:

• Inspect corner lead coplanarity, pin-one rotation, bridges, and every toe fillet; boundary or functional tests should cover each I/O bank.
• All lead toes should be optically accessible. Inspect alignment, heel/toe wetting, bridges, lifted leads, and orientation before functional test.

Common mistakes:

• A 0.8 mm-pitch QFP-32 can share pin count with 0.5 mm or smaller-body packages that are mechanically incompatible.
• Never infer functional pin numbering from another IC in the same mechanical family; verify symbol, footprint, and datasheet together.

1. Before approving TQFP-32 7×7 mm, compare the exact orderable-device drawing with the library item: body range (7.0 × 7.0 mm nominal), terminal or lead span (About 9.0 mm including leads), pitch (0.8 mm), pin count (32; 8 per side), height (Typically 1.0–1.2 mm), and exposed-pad definition (None on standard TQFP). Record the source drawing revision and every intentional courtyard, toe, heel, side, mask, or paste adjustment.
2. Treat the moderate hand-solder rating as a prototype-planning input, not proof of production yield. Review bent corner leads and confusing 7 mm with smaller 5 mm body variants with the assembler, confirm that stencil reflow or flux-rich drag soldering is compatible with the build, and require the S1 connectivity gate plus relevant S2 geometry checks to pass against the released footprint and selected fabrication profile.

Manufacturing gate checks:

1. S1Pad count, numbering, and schematic parity. Body size, overall span, 0.8 mm pitch, thirty-two pad numbers, and pin-one orientation all need explicit parity checks.
2. S2Lead-to-pad alignment and solder-mask web. Pitch, toe extension, and mask slivers must fit the selected assembly capability without hiding a lead.
3. S2Courtyard and body clearance. The body, leads, placement tolerance, rework access, and nearby height limits all belong in the manufacturing review.