SI4455-B1A-FM

The SI4455-B1A-FM is Silicon Labs’ SI4455 transceiver, a highly integrated, low‑power sub‑GHz RF transceiver (EZRadio family) intended for ISM/industrial links. It combines RF front‑end, fractional‑N synthesizer, baseband modem, and power regulators in a compact package, with an SPI control interface.
Key points:
- Frequency: suitable for common sub‑GHz ISM bands (roughly 240–960 MHz), configurable by region and variant.
- Modulation and data handling: supports GFSK, FSK, and OOK/ASK, with a built‑in packet engine (CRC, optional addressing) and RSSI/LQI reporting.
- Power and modes: designed for low power, with multiple sleep and power‑down states; TX/RX current depends on settings and data rate.
- Interface and packaging: controlled via SPI; available in small QFN/compact packages; “B1A-FM” denotes a specific revision/package variant.
Typical uses: long‑range remote controls, sensor networks, home/industrial automation, telemetry, and other low‑power wireless links.
For exact specs (voltage ranges, current, supported bands by region, and programming details), consult the SI4455 datasheet and application notes.

Here are the typical features of the SI4455-B1A-FM (Silicon Labs sub-GHz transceiver family):
- Fully integrated sub-GHz RF transceiver (front-end, PA, LNA, mixer, synthesizer) for ISM bands
- Frequency-agile multi-band operation (covering common sub-GHz ISM ranges via internal PLL)
- Modulation support: GFSK, FSK, 2-FSK, OOK/ASK (plus related modem options)
- On-chip baseband and packet engine (CRC, address filtering, length field, FIFO, framing)
- Programmable data rates spanning low to moderate speeds
- SPI control interface with GPIOs for MCU integration
- Configurable transmit power and high-sensitivity receive path
- Low-power operation with several power modes and fast wake-up
- Small package suitable for embedded applications (FM/B1A variant)
- Optional features typical to the Si445x family (e.g., low external parts count, RF diagnostics)
For exact band offerings, data rates, TX power, current consumption, and temperature range, consult the official SI4455 datasheet and the specific B1A-FM revision notes.

I don’t have live web access to look up SI4455‑B1A‑FM. Please provide the manufacturer or a datasheet/link, and I’ll identify the exact package type. Alternatively, paste the package section or a photo and I can tell you from that.

Pin count: 20 pins in a 4×4 mm QFN package (B1A-FM variant).
Function: 2.4 GHz RF transceiver with a digital interface. It uses SPI for control (SDI, SDO, SCLK, nSEL) and provides GPIOs (e.g., GDO0–GDO2), an RF differential I/O (RF_P, RF_N) for the antenna network, power pins (VDD, GND), and oscillator pins (XOSC_IN/XOSC_OUT). Suitable for wireless transceiver applications with configurable RF/modulation features per the datasheet.

Manufacturer: Vishay Intertechnology (sold under the Vishay Siliconix MOSFET brand).
What kind of company: Vishay is a multinational electronics components manufacturer specializing in discrete semiconductors (MOSFETs, diodes, transistors) and passive components (resistors, capacitors, inductors).

SI4455-B1A-FM is a low-power sub‑GHz transceiver for ISM-band wireless links. Typical applications:
- Industrial automation, asset tracking, telemetry
- Home/building automation (lighting, HVAC, sensors)
- Smart metering and energy monitoring
- Remote controls, alarms and security systems
- Wireless sensor networks and IoT devices (battery-powered)
- Agricultural and environmental monitoring

Functional equivalents (sub‑GHz FSK/OOK transceivers) to the Silicon Labs Si4455-B1A-FM include:
- Silicon Labs Si4463 / Si4464 (same family)
- TI CC1101
- Semtech SX1231 / SX1238
- Analog Devices ADF7021 / ADF7024
- Microchip (Atmel) AT86RF215 (multi‑band transceiver)
Check pinout, features and regulatory bands before substituting.