component

SX1280IMLTRT

Public Unreviewed

by Ray

SEMTECH RF Transceiver ICs, QFN-24-EP(4x4). Datasheet-verified pinout, KiCad symbol/footprint/3D.

componentrf and wirelesssx1280imltrt
Overview Files Discover Packages Releases Dependencies Issues Breadcrumbs Pull Requests Activity

3D Model

Open in new tab ↗
Loads on click. Unloads when scrolled away or the tab is hidden.

Symbol & Footprint

Schematic Symbol

Open full view ↗
Loads on click. Unloads when scrolled away or the tab is hidden.

PCB Footprint

Open full view ↗
Loads on click. Unloads when scrolled away or the tab is hidden.

Datasheet

Open in new tab ↗
Loads on click. Unloads when scrolled away or the tab is hidden.
Download PDF
Contents

README

markdown

SX1280IMLTRT

SEMTECH · RF Transceiver ICs · QFN-24-EP(4x4)

SX1280IMLTRT from SEMTECH, in a QFN-24-EP(4x4). Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
0 GND power_in Exposed ground pad on the underside of the QFN-24 package. Must be soldered to the PCB ground plane for electrical and thermal performance.
1 VR_PA power_in Regulated supply for the internal power amplifier (PA). Requires external decoupling per reference design.
2 VDD_IN power_in Regulated supply input. Must be connected externally to pin 12 (DCC_FB) so the internal regulator feeds the digital core.
3 NRESET input Active-low reset input with internal 50 kΩ pull-up. Drive low to reset the transceiver.
4 XTA passive Reference oscillator connection to external 52 MHz crystal, or single-ended input from an external TCXO.
5 GND power_in Ground return.
6 XTB passive Second reference oscillator connection to external 52 MHz crystal. Leave unconnected when driving from a TCXO on XTA.
7 BUSY output Transceiver busy indicator. Asserted while the chip is unable to accept a new command; the host must wait until BUSY is low before issuing SPI/UART commands.
8 DIO1 bidirectional Optional multi-purpose digital I/O. Typically configured as an interrupt output (e.g., TxDone/RxDone) via SetDioIrqParams.
9 DIO2 bidirectional Optional multi-purpose digital I/O configurable as an IRQ or RF switch control output.
10 DIO3 bidirectional Optional multi-purpose digital I/O configurable as an IRQ or TCXO supply control output.
11 VBAT_IO power_in Supply for the digital I/O interface, 1.8 V to 3.7 V. Must be ≤ VBAT.
12 DCC_FB power_out Regulated output voltage from the internal regulator. Tie externally to VDD_IN (pin 2) with the recommended decoupling.
13 GND power_in Ground return.
14 DCC_SW power_out DC-DC switcher output node. Connect the external buck inductor between this pin and the DC-DC filter capacitor per the reference design.
15 VBAT power_in Main supply for the RFIC, 1.8 V to 3.7 V. Must be ≥ VBAT_IO.
16 MISO_TX output SPI slave data output when the host interface is SPI, or UART Transmit when the host interface is UART.
17 MOSI_RX input SPI slave data input when the host interface is SPI, or UART Receive when the host interface is UART.
18 SCK_RTSN input SPI clock input (up to 18 MHz) when the host interface is SPI, or UART Request-To-Send when the host interface is UART.
19 NSS_CTS input SPI Slave Select (active low) when the host interface is SPI, or UART Clear-To-Send when the host interface is UART.
20 GND power_in Ground return.
21 GND power_in Ground return.
22 RFIO bidirectional Single-ended RF transmit output and receive input for the 2.4 GHz band. Requires the matching/filter network per the Semtech reference design.
23 GND power_in Ground return.
24 GND power_in Ground return.

Key specifications

Parameter Value
Manufacturer SEMTECH
Package QFN-24-EP(4x4)
Category RF And Wireless
Pins 25

Ordering variants

Same part, different packaging or reel option.

  • SX1280IMLTRT

CAD (KiCad official)

  • Symbol: SX1280IMLTRT
  • Footprint: Package_DFN_QFN:QFN-24-1EP_4x4mm_P0.5mm_EP2.7x2.7mm
  • 3D model: QFN-24-EP(4x4) (KiCad packages3D, STEP)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: SEMTECH datasheet (158 pp, sha256 ff541551f0d9ac7c, retrieved 2026-08-17, tier: lcsc)
  • Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF