ams AS5040 magnetic rotary encoder IC (SSOP16) — package footprint and magnet alignment — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/ams-as5040-ssop16/  (sheet CC BY 4.0)
Basis: ams AS5040 datasheet package drawing (SSOP16 table, rev 2.10) and magnet specification (v2-12), cross-checked with the AS5140H SSOP16 table.
Catalog version: 2026-10-20

Overall (mm): length 7.8, width 6.2, height 1.73
- Exact nominal dimensions. Body 6.20 (D, along the pin rows) × 5.30 (E1) mm; lead tip span E = 7.80 mm; datum is the package centre, seating plane on z=0.
- 16 gull-wing leads, 8 per side, 0.65 mm pitch, lead width b 0.315 mm, foot length L 0.75 mm typ.
- Modelled height 1.73 mm (body thickness A2); the datasheet gives 1.86 mm maximum seated height (A) with a 0.13 mm standoff (A1).
- Magnet axis on the package centre; the Hall array is a Ø2.2 mm circle (radius 1.1) around the die centre, and the die may sit up to ±0.235 mm off the package centre. Keep the magnet axis within 0.25 mm of the package centre.
- Recommended magnet: diametrically magnetised cylinder Ø6 × 2.5 mm. SMD part, no mounting holes. Not modelled: lead bends, mould draft, pin-1 mark.

dimension  symbol  mm
body length  D  6.2
body width  E1  5.3
lead span  E  7.8
pitch  e  0.65
lead width  b  0.315
max height  A  1.86
standoff  A1  0.13
body thickness  A2  1.73

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- ams (datasheet, via elecfans): AS5040 datasheet rev 2.10 — package drawing — web — Publisher's page; dimensions are facts — https://pdf.elecfans.com/AMSCO/AS5040.html
- ams (datasheet, via chipsmall): AS5040 datasheet v2-12 — magnetic input specification — web — Publisher's page; dimensions are facts — https://datasheet.chipsmall.com/AS5040-ASSM/107764.pdf
- ams (datasheet, via dtsheet): AS5140H datasheet v1-08 — same SSOP16 table — web — Publisher's page; dimensions are facts — https://dtsheet.com/doc/1463506/pdf

Free files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/ams-as5040-ssop16/index.json
API: https://xemstudio.com/api/geometry?object=ams-as5040-ssop16