SI4432-B1-FMR is available for purchase but is not normally stocked.
Available Substitutes:

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Texas Instruments
In Stock: 64 857
Unit Price: kr 33,76000
Datasheet
IC RF TxRx Only General ISM < 1GHz 240MHz ~ 930MHz 20-VFQFN Exposed Pad
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SI4432-B1-FMR

DigiKey Part Number
SI4432-B1-FMR-ND - Tape & Reel (TR)
Manufacturer
Manufacturer Product Number
SI4432-B1-FMR
Description
IC RF TXRX ISM<1GHZ 20QFN
Customer Reference
Detailed Description
IC RF TxRx Only General ISM < 1GHz 240MHz ~ 930MHz 20-VFQFN Exposed Pad
Datasheet
 Datasheet
EDA/CAD Models
SI4432-B1-FMR Models
Product Attributes
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Category
Sensitivity
-121dBm
Mfr
Serial Interfaces
SPI
Packaging
Tape & Reel (TR)
GPIO
3
Part Status
Not For New Designs
Voltage - Supply
1.8V ~ 3.6V
DigiKey Programmable
Not Verified
Current - Receiving
18.5mA
Type
TxRx Only
Current - Transmitting
85mA
RF Family/Standard
General ISM < 1GHz
Operating Temperature
-40°C ~ 85°C
Modulation
FSK, GFSK, OOK
Mounting Type
Surface Mount
Frequency
Package / Case
20-VFQFN Exposed Pad
Data Rate (Max)
256kbps
Supplier Device Package
20-QFN (4x4)
Power - Output
20dBm (Max)
Base Product Number
Environmental & Export Classifications
Product Questions and Answers
Additional Resources
Substitutes (1)
Part NumberManufacturerQuantity AvailableDigiKey Part NumberUnit PriceSubstitute Type
CC1101RGPRTexas Instruments64 857296-35718-1-NDkr 33,76000Similar
Available To Order
Not recommended for new design, minimums may apply View Substitutes or Alternative Package Types
All prices are in SEK
Tape & Reel (TR)
QuantityUnit PriceExt Price
2 500kr 67,29746kr 168 243,65
Manufacturers Standard Package
Unit Price without VAT:kr 67,29746
Unit Price with VAT:kr 84,12183