RF System on a Chip - SoC – Mouser Dominican Republic

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EFR32FG28 BLUETOOTH® SoCs

Silicon Labs EFR32FG28 BLUETOOTH® SoCs are an ideal dual-band Sub-GHz + 2.4GHz BLE SoC solution for “Internet of Things” applications in smart homes, security, lighting, building automation,and metering. This dual-band solution combines a high-performance Sub-GHz radio with long-range capabilities and a 2.4GHz BLE radio for increased design flexibility. The EFR32FG28 also adds an AI/ML Hardware accelerator for more efficient and accurate calculations at the edge. With memory options up to 256kB of RAM and 1024 kB of Flash, the Silicon Labs EFR32FG28 is ideal for more resource-intensive applications and stacks like Wi-SUN and Amazon Sidewalk, allowing users to support more ecosystems with simpler hardware designs.

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Part #

RF System on a Chip - SoC FG28, Sub-GHz +20, 2.4 GHz +10, 1024kB Flash, 256kB RAM, +20 dBm, Secure Vault-Mid, QFN68

EFR32FG28A122F1024GM68-A
Silicon Labs
1: $9.95
650In Stock

Mfr. Part #
EFR32FG28A122F1024GM68-A

Mouser Part #
634-FG28A122FGM68A

Silicon Labs

RF System on a Chip - SoC FG28, Sub-GHz +20, 2.4 GHz +10, 1024kB Flash, 256kB RAM, +20 dBm, Secure Vault-Mid, QFN68

Learn More

Datasheet

650In Stock

$9.95

$7.74

$7.19

$6.58

View

Min.: 1
Mult.: 1

Sub-GHz

ARM Cortex M33

20 dBm

- 125.8 dBm

1.71 V

3.8 V

6.1 mA

26.2 mA

1 MB

- 40 C

+ 85 C

QFN-68

Tray

RF System on a Chip - SoC FG28, Sub-GHz, 1024kB Flash, 256kB RAM, +20 dBm, Secure Vault-Mid, QFN48

EFR32FG28A120F1024GM48-AR
Silicon Labs
1: $10.15
2,330In Stock

Mfr. Part #
EFR32FG28A120F1024GM48-AR

Mouser Part #
634-FG28A120FGM48AR

Silicon Labs

RF System on a Chip - SoC FG28, Sub-GHz, 1024kB Flash, 256kB RAM, +20 dBm, Secure Vault-Mid, QFN48

Learn More

Datasheet

2,330In Stock

Cut Tape

$10.15

$8.25

$7.70

$7.02

View

Reel

$5.25

Min.: 1
Mult.: 1

: 2,500

Sub-GHz

ARM Cortex M33

20 dBm

- 125.8 dBm

1.71 V

3.8 V

6.1 mA

26.2 mA

1 MB

- 40 C

+ 85 C

QFN-48

Reel, Cut Tape

RF System on a Chip - SoC FG28, Sub-GHz +14, 2.4 GHz +10, 1024kB Flash, 256kB RAM, +14 dBm, Secure Vault - High, MVP, QFN68

EFR32FG28B312F1024IM68-A
Silicon Labs
1: $10.96
536In Stock

Mfr. Part #
EFR32FG28B312F1024IM68-A

Mouser Part #
634-FG28B312FIM68A

Silicon Labs

RF System on a Chip - SoC FG28, Sub-GHz +14, 2.4 GHz +10, 1024kB Flash, 256kB RAM, +14 dBm, Secure Vault - High, MVP, QFN68

Learn More

Datasheet

536In Stock

$10.96

$8.89

$8.52

$6.71

Quote

Min.: 1
Mult.: 1

Sub-GHz

ARM Cortex M33

14 dBm

- 125.8 dBm

1.71 V

3.8 V

6.1 mA

26.2 mA

1 MB

- 40 C

+ 125 C

QFN-68

Tray

RF System on a Chip - SoC FG28, Sub-GHz +20, 2.4 GHz +10, 1024kB Flash, 256kB RAM, +20 dBm, Secure Vault - High, MVP, QFN48

EFR32FG28B322F1024IM48-A
Silicon Labs
1: $11.10
1,484In Stock

Mfr. Part #
EFR32FG28B322F1024IM48-A

Mouser Part #
634-FG28B322FIM48A

Silicon Labs

RF System on a Chip - SoC FG28, Sub-GHz +20, 2.4 GHz +10, 1024kB Flash, 256kB RAM, +20 dBm, Secure Vault - High, MVP, QFN48

Learn More

Datasheet

1,484In Stock

$11.10

$9.08

$8.49

$7.76

View

Min.: 1
Mult.: 1

Sub-GHz

ARM Cortex M33

20 dBm

- 125.8 dBm

1.71 V

3.8 V

6.1 mA

26.2 mA

1 MB

- 40 C

+ 125 C

QFN-48

Tray

RF System on a Chip - SoC FG28, Sub-GHz +20, 2.4 GHz +10, 1024kB Flash, 256kB RAM, +20 dBm, Secure Vault - High, MVP, QFN68

EFR32FG28B322F1024IM68-A
Silicon Labs
1: $11.29
1,205In Stock

Mfr. Part #
EFR32FG28B322F1024IM68-A

Mouser Part #
634-FG28B322FIM68A

Silicon Labs

RF System on a Chip - SoC FG28, Sub-GHz +20, 2.4 GHz +10, 1024kB Flash, 256kB RAM, +20 dBm, Secure Vault - High, MVP, QFN68

Learn More

Datasheet

1,205In Stock

$11.29

$9.18

$8.57

$7.84

View

Min.: 1
Mult.: 1

Sub-GHz

ARM Cortex M33

20 dBm

- 125.8 dBm

1.71 V

3.8 V

6.1 mA

26.2 mA

1 MB

- 40 C

+ 125 C

QFN-68

Tray

RF System on a Chip - SoC FG28, Sub-GHz, 1024kB Flash, 128kB RAM, +14 dBm, Secure Vault-Mid, QFN68

EFR32FG28A010F1024GM68-A
Silicon Labs
1: $8.84
399In Stock

Mfr. Part #
EFR32FG28A010F1024GM68-A

Mouser Part #
634-FG28A010FGM68A

Silicon Labs

RF System on a Chip - SoC FG28, Sub-GHz, 1024kB Flash, 128kB RAM, +14 dBm, Secure Vault-Mid, QFN68

Learn More

Datasheet

399In Stock

$8.84

$6.85

$6.35

$5.81

View

Min.: 1
Mult.: 1

Sub-GHz

ARM Cortex M33

14 dBm

- 125.8 dBm

1.71 V

3.8 V

6.1 mA

26.2 mA

1 MB

- 40 C

+ 85 C

QFN-68

Tray

RF System on a Chip - SoC FG28, Sub-GHz, 1024kB Flash, 256kB RAM, +14 dBm, Secure Vault-Mid, QFN48

EFR32FG28A110F1024GM48-A
Silicon Labs
1: $9.78
418In Stock

Mfr. Part #
EFR32FG28A110F1024GM48-A

Mouser Part #
634-FG28A110FGM48A

Silicon Labs

RF System on a Chip - SoC FG28, Sub-GHz, 1024kB Flash, 256kB RAM, +14 dBm, Secure Vault-Mid, QFN48

Learn More

Datasheet

418In Stock

$9.78

$7.72

$7.20

$6.57

View

Min.: 1
Mult.: 1

Sub-GHz

ARM Cortex M33

14 dBm

- 125.8 dBm

1.71 V

3.8 V

6.1 mA

26.2 mA

1 MB

- 40 C

+ 85 C

QFN-48

Tray

RF System on a Chip - SoC FG28, Sub-GHz, 1024kB Flash, 256kB RAM, +20 dBm, Secure Vault-Mid, QFN48

EFR32FG28A120F1024GM48-A
Silicon Labs
1: $9.30
258In Stock

Mfr. Part #
EFR32FG28A120F1024GM48-A

Mouser Part #
634-FG28A120FGM48A

Silicon Labs

RF System on a Chip - SoC FG28, Sub-GHz, 1024kB Flash, 256kB RAM, +20 dBm, Secure Vault-Mid, QFN48

Learn More

Datasheet

258In Stock

$9.30

$7.52

$7.01

$6.39

View

Min.: 1
Mult.: 1

Sub-GHz

ARM Cortex M33

20 dBm

- 125.8 dBm

1.71 V

3.8 V

6.1 mA

26.2 mA

1 MB

- 40 C

+ 85 C

QFN-48

Tray

RF System on a Chip - SoC FG28, Sub-GHz, 1024kB Flash, 256kB RAM, +20 dBm, Secure Vault - High, MVP, QFN68

EFR32FG28B320F1024IM68-A
Silicon Labs
1: $10.55
151In Stock

Mfr. Part #
EFR32FG28B320F1024IM68-A

Mouser Part #
634-FG28B320FIM68A

Silicon Labs

RF System on a Chip - SoC FG28, Sub-GHz, 1024kB Flash, 256kB RAM, +20 dBm, Secure Vault - High, MVP, QFN68

Learn More

Datasheet

151In Stock

$10.55

$8.68

$8.13

$7.47

View

Min.: 1
Mult.: 1

Sub-GHz

ARM Cortex M33

20 dBm

- 125.8 dBm

1.71 V

3.8 V

6.1 mA

26.2 mA

1 MB

- 40 C

+ 125 C

QFN-68

Tray

RF System on a Chip - SoC FG28, Sub-GHz +20, 2.4 GHz +10, 1024kB Flash, 256kB RAM, +20 dBm, Secure Vault - High, MVP, QFN68

EFR32FG28B322F1024IM68-AR
Silicon Labs
1: $10.52
1,423In Stock

Mfr. Part #
EFR32FG28B322F1024IM68-AR

Mouser Part #
634-FG28B322FIM68AR

Silicon Labs

RF System on a Chip - SoC FG28, Sub-GHz +20, 2.4 GHz +10, 1024kB Flash, 256kB RAM, +20 dBm, Secure Vault - High, MVP, QFN68

Learn More

Datasheet

1,423In Stock

Cut Tape

$10.52

$8.21

$7.63

$7.00

$6.78

Reel

$6.77

Min.: 1
Mult.: 1

: 2,500

Sub-GHz

ARM Cortex M33

20 dBm

- 125.8 dBm

1.71 V

3.8 V

6.1 mA

26.2 mA

1 MB

- 40 C

+ 125 C

QFN-68

Reel, Cut Tape

RF System on a Chip - SoC FG28, Sub-GHz, 1024kB Flash, 256kB RAM, +14 dBm, Secure Vault-Mid, QFN68

EFR32FG28A110F1024GM68-A
Silicon Labs
1: $9.98
130In Stock

Mfr. Part #
EFR32FG28A110F1024GM68-A

Mouser Part #
634-FG28A110FGM68A

Silicon Labs

RF System on a Chip - SoC FG28, Sub-GHz, 1024kB Flash, 256kB RAM, +14 dBm, Secure Vault-Mid, QFN68

Learn More

Datasheet

130In Stock

$9.98

$7.76

$7.21

$6.60

View

Min.: 1
Mult.: 1

Sub-GHz

ARM Cortex M33

14 dBm

- 125.8 dBm

1.71 V

3.8 V

6.1 mA

26.2 mA

1 MB

- 40 C

+ 85 C

QFN-68

Tray

RF System on a Chip - SoC FG28, Sub-GHz, 1024kB Flash, 256kB RAM, +20 dBm, Secure Vault - High, MVP, QFN48

EFR32FG28B320F1024IM48-A
Silicon Labs
1: $10.89
143In Stock

Mfr. Part #
EFR32FG28B320F1024IM48-A

Mouser Part #
634-FG28B320FIM48A

Silicon Labs

RF System on a Chip - SoC FG28, Sub-GHz, 1024kB Flash, 256kB RAM, +20 dBm, Secure Vault - High, MVP, QFN48

Learn More

Datasheet

143In Stock

$10.89

$8.64

$8.07

$6.86

View

Min.: 1
Mult.: 1

Sub-GHz

ARM Cortex M33

20 dBm

- 125.8 dBm

1.71 V

3.8 V

6.1 mA

26.2 mA

1 MB

- 40 C

+ 125 C

QFN-48

Tray

RF System on a Chip - SoC FG28, Sub-GHz +14, 2.4 GHz +10, 1024kB Flash, 256kB RAM, +14 dBm, Secure Vault - High, MVP, QFN48

EFR32FG28B310F1024IM68-A
Silicon Labs
1: $10.94
1,163In Stock

Mfr. Part #
EFR32FG28B310F1024IM68-A

Mouser Part #
634-FG28B310FIM68A

Silicon Labs

RF System on a Chip - SoC FG28, Sub-GHz +14, 2.4 GHz +10, 1024kB Flash, 256kB RAM, +14 dBm, Secure Vault - High, MVP, QFN48

Learn More

Datasheet

1,163In Stock

$10.94

$8.68

$8.14

$7.82

View

Min.: 1
Mult.: 1

Sub-GHz

ARM Cortex M33

14 dBm

- 125.8 dBm

1.71 V

3.8 V

6.1 mA

26.2 mA

1 MB

- 40 C

+ 125 C

QFN-68

Tray

RF System on a Chip - SoC FG28, Sub-GHz, 1024kB Flash, 256kB RAM, +14 dBm, Secure Vault - High, MVP, QFN48

EFR32FG28B310F1024IM48-AR
Silicon Labs
2,500: $5.81
Non-Stocked Lead-Time 12 Weeks

Mfr. Part #
EFR32FG28B310F1024IM48-AR

Mouser Part #
634-EFR32FG28B31-AR

Silicon Labs

RF System on a Chip - SoC FG28, Sub-GHz, 1024kB Flash, 256kB RAM, +14 dBm, Secure Vault - High, MVP, QFN48

Learn More

Datasheet

Non-Stocked Lead-Time 12 Weeks

Reel

$5.81

Min.: 2,500
Mult.: 2,500

: 2,500

ARM Cortex M33

2 Mbps

1.71 V

3.8 V

5.1 mA

156.8 mA

1024 kB

- 40 C

+ 125 C

QFN-48

Reel

RF System on a Chip - SoC FG28, Sub-GHz +14, 2.4 GHz +10, 1024kB Flash, 256kB RAM, +14 dBm, Secure Vault - High, MVP, QFN48

EFR32FG28B310F1024IM68-AR
Silicon Labs
2,500: $6.08
Non-Stocked Lead-Time 12 Weeks

Mfr. Part #
EFR32FG28B310F1024IM68-AR

Mouser Part #
634-EFR32FG28B310-AR

Silicon Labs

RF System on a Chip - SoC FG28, Sub-GHz +14, 2.4 GHz +10, 1024kB Flash, 256kB RAM, +14 dBm, Secure Vault - High, MVP, QFN48

Learn More

Datasheet

Non-Stocked Lead-Time 12 Weeks

Reel

$6.08

Min.: 2,500
Mult.: 2,500

: 2,500

ARM Cortex M33

2 Mbps

1.7 V

3.8 V

5.1 mA

156.8 mA

1024 kB

- 40 C

+ 125 C

QFN-68

Reel

RF System on a Chip - SoC FG28, Sub-GHz, 1024kB Flash, 128kB RAM, +14 dBm, Secure Vault-Mid, QFN48

EFR32FG28A010F1024GM48-AR
Silicon Labs
2,500: $4.69
Non-Stocked Lead-Time 12 Weeks

Mfr. Part #
EFR32FG28A010F1024GM48-AR

Mouser Part #
634-FG28A010FGM48AR

Silicon Labs

RF System on a Chip - SoC FG28, Sub-GHz, 1024kB Flash, 128kB RAM, +14 dBm, Secure Vault-Mid, QFN48

Learn More

Datasheet

Non-Stocked Lead-Time 12 Weeks

Reel

$4.69

Min.: 2,500
Mult.: 2,500

: 2,500

Sub-GHz

ARM Cortex M33

14 dBm

- 125.8 dBm

1.71 V

3.8 V

6.1 mA

26.2 mA

1 MB

- 40 C

+ 85 C

QFN-48

Reel

RF System on a Chip - SoC FG28, Sub-GHz, 1024kB Flash, 128kB RAM, +14 dBm, Secure Vault-Mid, QFN68

EFR32FG28A010F1024GM68-AR
Silicon Labs
2,500: $4.96
Non-Stocked Lead-Time 12 Weeks

Mfr. Part #
EFR32FG28A010F1024GM68-AR

Mouser Part #
634-FG28A010FGM68AR

Silicon Labs

RF System on a Chip - SoC FG28, Sub-GHz, 1024kB Flash, 128kB RAM, +14 dBm, Secure Vault-Mid, QFN68

Learn More

Datasheet

Non-Stocked Lead-Time 12 Weeks

Reel

$4.96

Min.: 2,500
Mult.: 2,500

: 2,500

Sub-GHz

ARM Cortex M33

14 dBm

- 125.8 dBm

1.71 V

3.8 V

6.1 mA

26.2 mA

1 MB

- 40 C

+ 85 C

QFN-68

Reel

RF System on a Chip - SoC FG28, Sub-GHz, 1024kB Flash, 256kB RAM, +14 dBm, Secure Vault-Mid, QFN68

EFR32FG28A110F1024GM68-AR
Silicon Labs
2,500: $5.66
Non-Stocked Lead-Time 12 Weeks

Mfr. Part #
EFR32FG28A110F1024GM68-AR

Mouser Part #
634-FG28A110FGM68AR

Silicon Labs

RF System on a Chip - SoC FG28, Sub-GHz, 1024kB Flash, 256kB RAM, +14 dBm, Secure Vault-Mid, QFN68

Learn More

Datasheet

Non-Stocked Lead-Time 12 Weeks

Reel

$5.66

Min.: 2,500
Mult.: 2,500

: 2,500

Sub-GHz

ARM Cortex M33

14 dBm

- 125.8 dBm

1.71 V

3.8 V

6.1 mA

26.2 mA

1 MB

- 40 C

+ 85 C

QFN-68

Reel

RF System on a Chip - SoC FG28, Sub-GHz +14, 2.4 GHz +10, 1024kB Flash, 256kB RAM, +14 dBm, Secure Vault-Mid, QFN48

EFR32FG28A112F1024GM48-A
Silicon Labs
2,450: $5.95
Non-Stocked Lead-Time 12 Weeks

Mfr. Part #
EFR32FG28A112F1024GM48-A

Mouser Part #
634-FG28A112FGM48A

Silicon Labs

RF System on a Chip - SoC FG28, Sub-GHz +14, 2.4 GHz +10, 1024kB Flash, 256kB RAM, +14 dBm, Secure Vault-Mid, QFN48

Learn More

Datasheet

Non-Stocked Lead-Time 12 Weeks

$5.95

Min.: 2,450
Mult.: 2,450

Sub-GHz

ARM Cortex M33

14 dBm

- 125.8 dBm

1.71 V

3.8 V

6.1 mA

26.2 mA

1 MB

- 40 C

+ 85 C

QFN-48

Tray

RF System on a Chip - SoC FG28, Sub-GHz +14, 2.4 GHz +10, 1024kB Flash, 256kB RAM, +14 dBm, Secure Vault-Mid, QFN48

EFR32FG28A112F1024GM48-AR
Silicon Labs
2,500: $5.94
Non-Stocked Lead-Time 12 Weeks

Mfr. Part #
EFR32FG28A112F1024GM48-AR

Mouser Part #
634-FG28A112FGM48AR

Silicon Labs

RF System on a Chip - SoC FG28, Sub-GHz +14, 2.4 GHz +10, 1024kB Flash, 256kB RAM, +14 dBm, Secure Vault-Mid, QFN48

Learn More

Datasheet

Non-Stocked Lead-Time 12 Weeks

Reel

$5.94

Min.: 2,500
Mult.: 2,500

: 2,500

Sub-GHz

ARM Cortex M33

14 dBm

- 125.8 dBm

1.71 V

3.8 V

6.1 mA

26.2 mA

1 MB

- 40 C

+ 85 C

QFN-48

Reel

RF System on a Chip - SoC FG28, Sub-GHz +14, 2.4 GHz +10, 1024kB Flash, 256kB RAM, +14 dBm, Secure Vault-Mid, QFN68

EFR32FG28A112F1024GM68-A
Silicon Labs
1,300: $6.54
Non-Stocked Lead-Time 12 Weeks

Mfr. Part #
EFR32FG28A112F1024GM68-A

Mouser Part #
634-FG28A112FGM68A

Silicon Labs

RF System on a Chip - SoC FG28, Sub-GHz +14, 2.4 GHz +10, 1024kB Flash, 256kB RAM, +14 dBm, Secure Vault-Mid, QFN68

Learn More

Datasheet

Non-Stocked Lead-Time 12 Weeks

$6.54

View

Min.: 1,300
Mult.: 1,300

Sub-GHz

ARM Cortex M33

14 dBm

- 125.8 dBm

1.71 V

3.8 V

6.1 mA

26.2 mA

1 MB

- 40 C

+ 85 C

QFN-68

Tray

RF System on a Chip - SoC FG28, Sub-GHz +14, 2.4 GHz +10, 1024kB Flash, 256kB RAM, +14 dBm, Secure Vault-Mid, QFN68

EFR32FG28A112F1024GM68-AR
Silicon Labs
2,500: $5.90
Non-Stocked Lead-Time 12 Weeks

Mfr. Part #
EFR32FG28A112F1024GM68-AR

Mouser Part #
634-FG28A112FGM68AR

Silicon Labs

RF System on a Chip - SoC FG28, Sub-GHz +14, 2.4 GHz +10, 1024kB Flash, 256kB RAM, +14 dBm, Secure Vault-Mid, QFN68

Learn More

Datasheet

Non-Stocked Lead-Time 12 Weeks

Reel

$5.90

Min.: 2,500
Mult.: 2,500

: 2,500

Sub-GHz

ARM Cortex M33

14 dBm

- 125.8 dBm

1.71 V

3.8 V

6.1 mA

26.2 mA

1 MB

- 40 C

+ 85 C

QFN-68

Reel

RF System on a Chip - SoC FG28, Sub-GHz, 1024kB Flash, 256kB RAM, +20 dBm, Secure Vault-Mid, QFN68

EFR32FG28A120F1024GM68-A
Silicon Labs
1: $9.13
Non-Stocked Lead-Time 12 Weeks

Mfr. Part #
EFR32FG28A120F1024GM68-A

Mouser Part #
634-FG28A120FGM68A

Silicon Labs

RF System on a Chip - SoC FG28, Sub-GHz, 1024kB Flash, 256kB RAM, +20 dBm, Secure Vault-Mid, QFN68

Learn More

Datasheet

Non-Stocked Lead-Time 12 Weeks

$9.13

$7.07

$6.56

$6.13

Quote

Min.: 1
Mult.: 1

Sub-GHz

ARM Cortex M33

20 dBm

- 125.8 dBm

1.71 V

3.8 V

6.1 mA

26.2 mA

1 MB

- 40 C

+ 85 C

QFN-68

Tray

RF System on a Chip - SoC FG28, Sub-GHz, 1024kB Flash, 256kB RAM, +20 dBm, Secure Vault-Mid, QFN68

EFR32FG28A120F1024GM68-AR
Silicon Labs
2,500: $6.26
Non-Stocked Lead-Time 12 Weeks

Mfr. Part #
EFR32FG28A120F1024GM68-AR

Mouser Part #
634-FG28A120FGM68AR

Silicon Labs

RF System on a Chip - SoC FG28, Sub-GHz, 1024kB Flash, 256kB RAM, +20 dBm, Secure Vault-Mid, QFN68

Learn More

Datasheet

Non-Stocked Lead-Time 12 Weeks

Reel

$6.26

Min.: 2,500
Mult.: 2,500

: 2,500

Sub-GHz

ARM Cortex M33

20 dBm

- 125.8 dBm

1.71 V

3.8 V

6.1 mA

26.2 mA

1 MB

- 40 C

+ 85 C

QFN-68

Reel

RF System on a Chip - SoC FG28, Sub-GHz +20, 2.4 GHz +10, 1024kB Flash, 256kB RAM, +20 dBm, Secure Vault-Mid, QFN48

EFR32FG28A122F1024GM48-A
Silicon Labs
2,450: $6.32
Non-Stocked Lead-Time 12 Weeks

Mfr. Part #
EFR32FG28A122F1024GM48-A

Mouser Part #
634-FG28A122FGM48A

Silicon Labs

RF System on a Chip - SoC FG28, Sub-GHz +20, 2.4 GHz +10, 1024kB Flash, 256kB RAM, +20 dBm, Secure Vault-Mid, QFN48

Learn More

Datasheet

Non-Stocked Lead-Time 12 Weeks

$6.32

Min.: 2,450
Mult.: 2,450

Sub-GHz

ARM Cortex M33

20 dBm

- 125.8 dBm

1.71 V

3.8 V

6.1 mA

26.2 mA

1 MB

- 40 C

+ 85 C

QFN-48

Tray

EFR32FG28 BLUETOOTH® SoCs

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