# PCB mounting guidelines

Source: [https://docs.qualcomm.com/doc/80-73475-1/topic/pcb-mounting-guidelines.html](https://docs.qualcomm.com/doc/80-73475-1/topic/pcb-mounting-guidelines.html)

## ELV and RoHS requirements

Source: [https://docs.qualcomm.com/doc/80-73475-1/topic/pcb-mounting-guidelines.html](https://docs.qualcomm.com/doc/80-73475-1/topic/pcb-mounting-guidelines.html)

The device meets the substance restriction requirements of the EU ELV directive and the
            EU RoHS directive. Its SnAgCu solder balls have SAC405 composition.

## SMT assembly guidelines

Source: [https://docs.qualcomm.com/doc/80-73475-1/topic/pcb-mounting-guidelines.html](https://docs.qualcomm.com/doc/80-73475-1/topic/pcb-mounting-guidelines.html)

For recommendations on SMT process development, see the [<cite class="cite">SMT Assembly Guidelines</cite>
                (SM80-P0982-1)](https://docs.qualcomm.com/bundle/SM80-P0982-1/resource/SM80-P0982-1.pdf)

## Daisy-chain components

Source: [https://docs.qualcomm.com/doc/80-73475-1/topic/pcb-mounting-guidelines.html](https://docs.qualcomm.com/doc/80-73475-1/topic/pcb-mounting-guidelines.html)

Daisy-chain packages use the same processes and materials as actual products; they are
            recommended for SMT characterization and board-level reliability testing. The SMT
            process recommendations described in [SMT assembly guidelines](https://docs.qualcomm.com/doc/80-73475-1/topic/pcb-mounting-guidelines.html#concept_kfr_ws5_tzb) can be
            performed using daisy-chain components.

For Daisy-chain PCB routing recommendations, see the [<cite class="cite">Daisy Chain Interconnect, FCBGA1326+HS, 25.0 ×
                    25.0 mm,</cite> (DS90-31845-R1)](https://createpoint.qti.qualcomm.com/search/contentdocument/stream/dcn/DS90-31845-R1).

Last Published: Jan 08, 2026

[Previous Topic
Carrier, storage, and handling information](https://docs.qualcomm.com/bundle/publicresource/80-73475-1/topics/carrier.md) [Next Topic
Part reliability](https://docs.qualcomm.com/bundle/publicresource/80-73475-1/topics/part-reliability.md)