I think the LILYGO T-Beam I have uses this chip but I've not checked. It's not specified in the ailexpress listing.

https://www.semtech.com/products/wireless-rf/lora-connect/sx1276 SX1276/77/78/79

Specs from Semtec:

“Using Semtech’s patented LoRa modulation technique SX1276/77/78/79 can achieve a sensitivity of over -148dBm using a low cost crystal and bill of materials. The high sensitivity combined with the integrated +20dBm power amplifier”

  168dB maximum link budget
  +20dBm - 100mW constant RF output vs. V supply
  +14dBm high efficiency PA
  Programmable bit rate up to 300kbps
  High sensitivity: down to -148dBm
  Bullet-proof front end: IIP3 = -11dBm
  Excellent blocking immunity
  Low RX current of 9.9mA, 200nA register retention
  Fully integrated synthesizer with a resolution of 61Hz
  FSK, GFSK, MSK, GMSK, LoRa and OOK modulation
  Built-in bit synchronizer for clock recovery
  Preamble detection
  127dB Dynamic Range RSSI
  Automatic RF Sense and CAD with ultra-fast AFC
  Packet engine up to 256 bytes with CRC
  Built-in temperature sensor and low battery indicator

SX1276 Datasheet

“Better” than SX1276, according to comments on the internet / meshtastic people.

Used in most boards I have: Heltec, Waveshare Pi Pico module, but maybe not the LILYGO T-Beam, which is probably the SX1276.

Semtec specs:

  LoRa and FSK Modem
  170dB maximum link budget (SX1262 / 68)
  +22dBm or +15dBm high efficiency PA
  Low RX current of 4.6mA
  Integrated DC-DC converter and LDO
  Programmable bit rate up to 62.5kbps LoRa and 300kbps FSK
  High sensitivity: down to -148dBm
  88dB blocking immunity at 1MHz offset
  Co-channel rejection of 19dB in LoRa mode
  FSK, GFSK, MSK, GMSK, LoRa and Long Range FHSS modulations
  Built-in bit synchronizer for clock recovery
  Automatic Channel Activity Detection (CAD) with ultra-fast AFC

SX1262 Datasheet

e.g. STM32WLE5CCU6 (was in stock), ~$3 @ 100 at lcsc.

SOC with STM32L4 and LoRa radio.

Datasheet