TSSOP-14 PCB Footprint: Dimensions, DFM, and Assembly Guide

TSSOP-14 is a gull wing package used for surface mount assembly, also seen labeled thin shrink small outline 14, MO-153 variants. A dependable footprint follows the exact orderable-device drawing rather than the family name: nominal body About 5.0 × 4.4 mm, overall span About 6.4 mm lead span, seated height Typically 1.0–1.2 mm, pitch 0.65 mm, pin count 14, and exposed pad Normally none.

Select the exact 4.4 mm-body TSSOP variant and check lead length; do not stretch a shorter eight-pin land pattern.

Typical uses include quad amplifiers, logic buffers, sensor interfaces. A common TSSOP-14 uses 0.65 mm pitch and about a 4.4 mm body width; exact length and lead geometry are device-specific.

• Seven leads per side make row straightness and 0.65 mm pitch accumulation important; the body is typically wider than an eight-pin TSSOP.
• Gull-wing package names cover families of drawings; body width, lead span, lead length, and seated height must all match the orderable part.

Route repeated channels consistently, keep analog inputs away from digital outputs, and provide a short return for every local bypass capacitor.

• 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 controlled drag soldering. Watch for cumulative row misalignment and bridges hidden by excess flux.

• Use fab-compatible mask dams and paste apertures along the full row; one shifted aperture can bridge several adjacent leads.
• 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:

• Check end-lead registration, then scan the whole row at an oblique angle for lifted feet and bridges before channel-by-channel test.
• All lead toes should be optically accessible. Inspect alignment, heel/toe wetting, bridges, lifted leads, and orientation before functional test.

Common mistakes:

• Mirroring a bottom-side TSSOP footprint or placement rotation without checking pin-one convention reverses the entire multi-channel pin map.
• Never infer functional pin numbering from another IC in the same mechanical family; verify symbol, footprint, and datasheet together.

1. Before approving TSSOP-14, compare the exact orderable-device drawing with the library item: body range (About 5.0 × 4.4 mm), terminal or lead span (About 6.4 mm lead span), pitch (0.65 mm), pin count (14), height (Typically 1.0–1.2 mm), and exposed-pad definition (Normally none). 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 cumulative row misalignment and bridges hidden by excess flux with the assembler, confirm that stencil reflow or controlled 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. All fourteen pins, power units, no-connect decisions, and footprint rotation must survive schematic-to-PCB parity checking.
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.