IPC-SM-782A-表面贴装焊盘图形设计标准.pdf.pdf - 第148页

4.0 COMPONENT DIMENSIONS Figure 2 provides the component dimensions for PQFP components. PQFP Component Identiﬁer (Pin Count) L (mm) S (mm) W (mm) T (mm) A (mm) B (mm) E (mm) H (mm) min max min max min max min max max ma…

1.0 SCOPE

This subsection provides the component and land pattern

dimensions for PQFP (Plastic Quad Flat Pack) components.

Basic construction of the PQFP device is also covered. At the

end of this subsection is a listing of the tolerances and target

solder joint dimensions used to arrive at the land pattern

dimensions.

2.0 APPLICABLE DOCUMENTS

See Section 11.0 and the following for documents applicable

to the subsections.

Electronic Industries Association (EIA)

JEDEC Publication 95

Registered and Standard Outlines for

Solid State and Related Products, ‘‘Low Profile Plastic Quad

Flat Pack Family 0.025 Lead Spacing (Gullwing), Outline

MO-086, issue ‘‘B,’’ dated 6/90

Application for copies should be addressed to:

Global Engineering Documents

1990 M Street N.W.

Washington, DC

3.0 COMPONENT DESCRIPTIONS

Flatpacks are widely used in a variety of applications for com-

mercial, industrial, or military electronics.

3.1 Basic Construction See Figure 1. PQFPs have leads

on a 0.635 mm pitch.

3.1.1 Termination Materials Leads must be solder-

coated with a tin/lead alloy. The solder should contain

between 58 to 68% tin. Solder may be applied to the leads by

hot dipping or by plating from solution. Plated solder termina-

tions should be subjected to post-plating reflow operation to

fuse the solder. The tin/lead finish should be at least 0.0075

mm [0.0003 in] thick.

3.1.2 Marking All parts shall be marked with a part number

and an index area. The index area shall identify the location of

pin 1.

3.1.3 Carrier Package Format The carrier package for-

mat for PFQPs is the tube format; however, packaging trays

provide the best handling capability.

3.1.4 Process Considerations PQFPs are usually pro-

cessed using standard solder reflow processes. Parts should

be capable of withstanding ten cycles through a standard

reflow system operating at 215°C. Each cycle shall consist of

60 seconds exposure at 215°C.

IPC-782-11-1-1

Figure 1 PQFP construction

IPC-SM-782

Surface Mount Design

and Land Pattern Standard

Date

5/96

Section

11.1

Revision

Subject

PQFP

Page1of4

4.0 COMPONENT DIMENSIONS

Figure 2 provides the component dimensions for PQFP components.

PQFP

Component

Identiﬁer

(Pin Count)

L (mm) S (mm) W (mm) T (mm) A (mm) B (mm) E (mm) H (mm)

min max min max min max min max max max basic max

PQFP 84 19.55 20.05 17.55 18.16 0.20 0.30 0.75 1.00 16.80 16.80 0.635 4.57

PQFP 100 22.10 22.60 20.10 20.71 0.20 0.30 0.75 1.00 19.35 19.35 0.635 4.57

PQFP 132 27.20 27.70 25.25 25.81 0.20 0.30 0.75 1.00 24.40 24.40 0.635 4.57

PQFP 164 32.25 32.75 30.25 30.86 0.20 0.30 0.75 1.00 29.40 29.40 0.635 4.75

PQFP 196 37.35 37.85 35.35 35.96 0.20 0.30 0.75 1.00 34.40 34.40 0.635 4.57

PQFP 244 41.65 42.15 39.65 40.26 0.20 0.30 0.75 1.00 45.40 45.40 0.635 4.57

Figure 2 PQFP dimensions

IPC-782-11-1-2

IPC-SM-782

Subject

PQFP

Date

5/96

Section

11.1

Revision

Page2of4

5.0 LAND PATTERN DIMENSIONS

Figure 3 provides the land pattern dimensions for PQFP com-

ponents. These numbers represent industry consensus on the

best dimensions based on empirical knowledge of fabricated

land patterns.

In the table, the dimensions shown are at maximum material

condition (MMC). The least material condition (LMC) should

not exceed the fabrication (F) allowance shown on page 4.

The LMC and the MMC provide the limits for each dimension.

The dotted line in Figure 3 shows the grid placement court-

yard which is the area required to place land patterns and

their respective components in adjacent proximity without

interference or shorting. Numbers in the table represent the

number of grid elements (each element is 0.5 by 0.5 mm) in

accordance with the international grid detailed in IEC publica-

tion 97.

RLP No.

Component

Identiﬁer

(Pin Count) Z (mm) G (mm) X (mm)

Y (mm) C (mm) D (mm) E (mm)

Placement Grid

(No. of Grid

Elements)

ref ref ref basic

530A PQFP 84 20.60 17.00 0.35 1.80 18.80 12.70 0.63 44X44

531A PQFP 100 23.20 19.60 0.35 1.80 21.40 15.24 0.63 50X50

532A PQFP 132 28.20 24.60 0.35 1.80 26.40 20.32 0.63 58X58

533A PQFP 164 33.40 29.80 0.35 1.80 31.60 25.40 0.63 68X68

534A PQFP 196 38.40 34.80 0.35 1.80 36.60 30.48 0.63 80X80

535A PQFP 244 42.80 39.20 0.35 1.80 41.00 38.10 0.63 88X88

Figure 3

▼

Full radius optional

▼

Grid

placement

courtyard

▼

DGCZ

IPC-782-11-1-3

IPC-SM-782

Subject

PQFP

Date

5/96

Section

11.1

Revision

Page3of4