COMPONENT PACKAGES

WSON Component Package

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Overview

NameWSON (Plastic Small-outline No-lead Package)
Synonyms
  • DMB/PWSON (Texas Instruments)
  • DQD (Texas Instruments)
VariantsVarying number of pins.
Similar ToSOICUSON
MountingSMD
Pin Count8 (all also have exposed thermal pad)
PitchVaries. Many are 1.27mm (just like SOIC, for example the Cypress WSON 8L package), the TI DMB package as a pitch of 1.0mm, and the TI DQD package as a pitch of 0.4mm.
SolderabilityHard to solder with a soldering iron due to underside thermal pad.
Thermal Resistance
Dimensions

WSON-8

  • Package: 6.0x5.0x0.80mm (wlh, Winbond package code ZP)
  • Recommended Land Pattern: 6.10x5.10mm (31.11mm2)
3D Models
Common Uses
  • Flash memory ICs
  • Secondary-side bias regulators for DC-DC converters

Comments

The WSON package has a exposed thermal pad on the underside. However, it is not normally electrically connected to anything, and is optionally soldered to the PCB. It is recommended to be soldered when the PCB has a large amount of flex, else left unconnected.

Below is an “odd shaped” SON package used by Numonyx flash chips that goes under the name VDFPN8. Notice the half-round appearance of the pins.

Outline and dimensions for the VDFPN8 (SON-8) component package of a Numonyx flash IC.Image from http://www.micron.com/~/media/Documents/Products/Data%20Sheet/NOR%20Flash/Serial%20NOR/M25P/M25P128.pdf.

Outline and dimensions for the VDFPN8 (SON-8) component package of a Numonyx flash IC.Image from http://www.micron.com/~/media/Documents/Products/Data%20Sheet/NOR%20Flash/Serial%20NOR/M25P/M25P128.pdf.

Atmel produces a document titled PCB Design Considerations when Changing from 6-pin SOT23 to 6-pin WSON Atmel Products. It is a good read if you are migrating from larger SOT-23 packages to the smaller WSON package.

The DMB/PWSON Package (Texas Instruments)

The DMB package (also called PWSON) is a variant of the WSON package used by Texas Instruments. It has a pitch of 1mm. The HDC1080 datasheet is an example of a TI component which comes in the DMB package.

The DQD Package (Texas Instruments)

The DQD package is a variant of the WSON package used by Texas Instruments. The TPD8F003 datasheet is an example of a TI component which comes in the DQD package.

The pin diagram for three different TPD8F003 family components which come in the WSON package (the TI synonym for WSON is DQD).

The pin diagram for three different TPD8F003 family components which come in the WSON package (the TI synonym for WSON is DQD).

3D model exist for some of the DQD packages on 3DContentCentral, for example:

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