27 28 1 2 bottom view—exposed pad uf package 28-lead plastic qfn (4mm · 4mm) reference ltc dwg # 05-08-1721 rev a) 2.64 ± 0.10 (4-sides) 0.75 ± 0.05 r = 0.115 typ 0.20 ± 0.05 0.40 bsc 0.200 ref 0.00 – 0.05 (uf28) qfn 0106 reva recommended solder pad pitch and dimensions apply solder mask to areas that are not soldered 0.70 ±0.05 0.20 ...

Flat no-leads packages such as quad-flat no-leads (QFN) [1] and dual-flat no-leads (DFN) physically and electrically connect integrated circuits to printed circuit boards.

EFM8BB22F16I-C-QFN28 – CIP-51 8051 Busy Bee Microcontroller IC 8-Bit 50MHz 16KB (16K x 8) FLASH 28-QFN (5x5) from Silicon Labs. Pricing and Availability on millions of electronic components from Digi-Key Electronics.

Order today, ships today. CP2103-GM – USB Bridge, USB to UART USB 2.0 UART Interface 28-QFN (5x5) from Silicon Labs. Pricing and Availability on millions of electronic components from Digi-Key Electronics.

DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE.

CP2102N-A02-GQFN28 – USB Bridge, USB to UART USB 2.0 UART Interface 28-QFN (5x5) from Silicon Labs. Pricing and Availability on millions of electronic components from Digi-Key Electronics.

Mouser offers inventory, pricing, & datasheets for QFN-28 I/O Controller Interface IC.

Mouser offers inventory, pricing, & datasheets for QFN-28 Power Management ICs.

QFN-28 RF Transceiver are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for QFN-28 RF Transceiver.

QFN-28 8-bit Microcontrollers - MCU are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for QFN-28 8-bit Microcontrollers - MCU.