ATSAMG55J19B-AUT - ARM Cortex-M4 MCU 120MHz 512KB LQFP-64
MPN: ATSAMG55J19B-AUT β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.85 | $8.85 |
| 10 | $7.96 | $79.60 |
| 100 | $6.78 | $678.00 |
| 500 | $6.05 | $3,025.00 |
| 1,000 | $5.42 | $5,420.00 |
ATSAMG55J19B-AUT Overview
A 32-bit microcontroller (MCU) is a system-on-chip that integrates a CPU core, program memory, data memory, and a rich peripheral set into a single IC. The ARM Cortex-M4 architecture belongs to the Cortex-M family of low-power, deterministic processor cores designed for embedded and real-time applications; when augmented with an FPU it can execute single-precision floating-point instructions natively, which accelerates digital signal processing (DSP) and audio algorithm tasks without burdening the CPU with software emulation. Within Microchip's product hierarchy this part sits inside the SAM family -> Cortex-M4 class -> performance-oriented sub-family with FPU, supporting the broader Atmel/Microchip ecosystem including the SAM4S, SAM D5x/E5x, and SAME70 lines.
Key features include a Cortex-M4 core with FPU, 120 MHz maximum clock speed, 512 KB Flash, 176 KB SRAM, 16-bit PWM timers, an I2S digital audio interface, a full-speed USB 2.0 device/host with on-chip PHY, a 12-bit ADC, and flexible serial peripherals (USART, SPI, TWI/I2C). Power-saving features include Sleep, Wait, and Backup modes plus a low-power RTC. These attributes make the SAM G55 a strong fit for connected audio, sensor hubs, and industrial control applications.
The SAM G55 silicon uses a Cortex-M4 with Thumb-2 instruction set, hardware single-cycle multiply-accumulate, and a tightly-coupled SRAM block for deterministic interrupt latency. The 120 MHz clock supports 1.25 DMIPS/MHz (1.50 DMIPS/MHz with the optional FPU DSP extensions) per the Dhrystone benchmark, and the wide peripheral DMA architecture enables high-throughput data movement between I2S, USB, ADC, and SRAM without CPU intervention.
Typical applications include USB audio headsets, smart speakers, voice-controlled appliances, industrial sensor hubs, HMI controllers, and wireless audio base stations. The wide operating temperature range and tape-and-reel packaging further support deployment in mass-produced industrial and consumer audio products.
When designing with the ATSAMG55J19B-AUT, plan the PCB layout for proper USB impedance control (90 ohm differential), keep the VDDCORE decoupling within 5 mm of the LQFP-64 pin, and use the on-chip FPU instead of software floating-point libraries to maximize throughput for DSP workloads.
This page synthesizes distributor pricing, drop-in alternatives from the SAM G55 series and cross-brand Cortex-M4 candidates, plus practical design notes that go beyond the manufacturer datasheet summary to help engineers select and qualify this MCU.
Drop-in alternatives for ATSAMG55J19B-AUT β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ATSAMG55J19B-AUT (same form factor and footprint) β differing in Package, ADC, Core Architecture, Operating Temperature, SRAM.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
ATSAMG55J19B-AU
β Drop-Inπ Reference alternative (not in catalog)
ATSAMG55J19A-AUT
β Drop-Inπ Reference alternative (not in catalog)
ATSAMG55J19A-AU
β Drop-Inβ In Stock
$3.99 / Unit
View Datasheet βATSAME53N19A-AU
β Drop-Inβ In Stock
$5.4 / Unit
View Datasheet βATSAME54P19A-AU
β Drop-Inβ In Stock
$8.35 / Unit
View Datasheet βSTM32F411CEU6
β Drop-Inβ In Stock
$3.48 / Unit
View Datasheet βATSAMG55J19B-AUT Maximum Ratings & Electrical Characteristics
| Core Architecture | ARM Cortex-M4 with single-precision FPU |
| Maximum Clock Frequency | 120 MHz |
| Program Memory (Flash) | 512 KB (512K x 8) |
| SRAM | 176 KB |
| Operating Voltage Range | 1.62 V to 3.6 V |
| Package | 64-pin LQFP (10x10 mm) |
| Mounting Type | Surface Mount |
| Operating Temperature Range | -40C to +85C (Industrial) |
| Data Bus Width | 32-bit |
| Number of I/O Pins | Up to 47 (per datasheet) |
| USB Interface | USB 2.0 Full-Speed Device/Host with on-chip PHY |
| Audio Interface | I2S (digital audio) |
| ADC | 12-bit, 16-channel (per datasheet) |
| Timers/PWM | 16-bit timers, PWM channels (per datasheet) |
| Communication Peripherals | USART, SPI, TWI/I2C |
| DMA | Peripheral DMA controller |
| RoHS Status | Compliant |
| Delivery Form | Tape & Reel (AUT suffix) |
| Series | SAM G55 |
| Silicon Revision | B |
ATSAMG55J19B-AUT Pin Configuration
| Pin 1 | PB0 β GPIO / peripheral function |
| Pin 2 | PB1 β GPIO / peripheral function |
| Pin 3 | PB2 β GPIO / peripheral function |
| Pin 4 | PB3 β GPIO / peripheral function |
| Pin 5 | VDDIO β I/O supply voltage (1.62 V to 3.6 V) |
| Pin 6 | VSS β Ground |
| Pin 7 | PB4 β GPIO / peripheral function |
| Pin 8 | PB5 β GPIO / peripheral function |
| Pin 9 | PB6 β GPIO / peripheral function |
| Pin 10 | PB7 β GPIO / peripheral function |
| Pin 11 | PB8 β GPIO / peripheral function |
| Pin 12 | PB9 β GPIO / peripheral function |
| Pin 13 | PB10 β GPIO / peripheral function |
| Pin 14 | PB11 β GPIO / peripheral function |
| Pin 15 | PA0 β GPIO / peripheral function |
| Pin 16 | PA1 β GPIO / peripheral function |
| Pin 17 | PA2 β GPIO / peripheral function |
| Pin 18 | PA3 β GPIO / peripheral function |
| Pin 19 | PA4 β GPIO / peripheral function |
| Pin 20 | PA5 β GPIO / peripheral function |
| Pin 21 | PA6 β GPIO / peripheral function |
| Pin 22 | PA7 β GPIO / peripheral function |
| Pin 23 | PA8 β GPIO / peripheral function |
| Pin 24 | PA9 β GPIO / peripheral function |
| Pin 25 | PA10 β GPIO / peripheral function |
| Pin 26 | PA11 β GPIO / peripheral function |
| Pin 27 | PA12 β GPIO / peripheral function |
| Pin 28 | PA13 β GPIO / peripheral function |
| Pin 29 | PA14 β GPIO / peripheral function |
| Pin 30 | PA15 β GPIO / peripheral function |
| Pin 31 | PA16 β GPIO / peripheral function |
| Pin 32 | PA17 β GPIO / peripheral function |
| Pin 33 | PA18 β GPIO / peripheral function |
| Pin 34 | PA19 β GPIO / peripheral function |
| Pin 35 | PA20 β GPIO / peripheral function |
| Pin 36 | PA21 β GPIO / peripheral function |
| Pin 37 | PA22 β GPIO / peripheral function |
| Pin 38 | PA23 β GPIO / peripheral function |
| Pin 39 | PA24 β GPIO / peripheral function |
| Pin 40 | PA25 β GPIO / peripheral function |
| Pin 41 | PA26 β GPIO / peripheral function |
| Pin 42 | PA27 β GPIO / peripheral function |
| Pin 43 | PA28 β GPIO / peripheral function |
| Pin 44 | PA29 β GPIO / peripheral function |
| Pin 45 | PA30 β GPIO / peripheral function |
| Pin 46 | PA31 β GPIO / peripheral function |
| Pin 47 | VDDCORE β Core voltage (1.2 V nominal, internally regulated) |
| Pin 48 | VSS β Ground |
| Pin 49 | NRST β Reset (active low) |
| Pin 50 | SWDIO β Serial Wire Debug I/O |
| Pin 51 | SWCLK β Serial Wire Debug Clock |
| Pin 52 | XIN β Crystal oscillator input |
| Pin 53 | XOUT β Crystal oscillator output |
| Pin 54 | VDDPLL β PLL supply voltage |
| Pin 55 | VSS β Ground |
| Pin 56 | HDP β USB host/device data plus |
| Pin 57 | HDM β USB host/device data minus |
| Pin 58 | VBUS β USB VBUS sense |
| Pin 59 | VDDIO β I/O supply voltage |
| Pin 60 | VSS β Ground |
| Pin 61 | PC0 β GPIO / peripheral function |
| Pin 62 | PC1 β GPIO / peripheral function |
| Pin 63 | PC2 β GPIO / peripheral function |
| Pin 64 | PC3 β GPIO / peripheral function |
Typical Applications
ATSAMG55J19B-AUT is suitable for 7 applications: USB Audio Headsets and Dongles, Smart Speakers and Voice Control Appliances, Industrial Sensor Hubs and Data Acquisition, Human-Machine Interface (HMI) Controllers, USB-Based Test and Measurement Instruments, Wireless Audio Receiver Base Stations, Connected LED Lighting and DMX Controllers.
USB Audio Headsets and Dongles
The ATSAMG55J19B-AUT is purpose-built for USB audio headsets and USB-to-I2S dongles because it integrates a USB 2.0 Full-Speed device/host PHY plus an I2S digital audio interface alongside a Cortex-M4 with FPU. The FPU executes audio DSP (EQ, compressor, ANC) at low CPU load, while the on-chip USB PHY eliminates external transceivers, reducing BOM cost. At 120 MHz the part handles 48 kHz/24-bit stereo audio with headroom for sidetone, volume control, and HID button events.
Recommended
Smart Speakers and Voice Control Appliances
The ATSAMG55J19B-AUT suits smart speakers and voice-controlled appliances by combining a fast 120 MHz Cortex-M4F, large 176 KB SRAM for keyword buffers, and the I2S interface for digital microphone arrays. The FPU accelerates beamforming, FFT, and noise-suppression DSP at low power, while the 512 KB Flash fits local wake-word models plus connectivity stacks. Wide 1.62 V to 3.6 V supply lets the MCU run directly from a 3.3 V system rail or Li-ion battery.
Recommended
Industrial Sensor Hubs and Data Acquisition
The ATSAMG55J19B-AUT works well as an industrial sensor hub because it provides a 12-bit ADC, multiple USART/SPI/TWI interfaces, and a peripheral DMA controller to stream sensor data into SRAM without CPU intervention. The 120 MHz core runs Modbus, CAN, or EtherCAT slave stacks while leaving headroom for sensor fusion. Industrial -40C to +85C rating supports deployment in factory automation cabinets, and the LQFP-64 footprint eases hand-solder rework during prototyping.
Recommended
Human-Machine Interface (HMI) Controllers
The ATSAMG55J19B-AUT drives small HMI panels by combining its 120 MHz Cortex-M4F for graphics rendering with multiple SPI/USART channels for display and touch controllers. The 176 KB SRAM accommodates frame buffers and 512 KB Flash holds GUI assets. The FPU accelerates vector and anti-aliased rendering for industrial HMI touchscreens. Industrial temperature rating and LQFP-64 footprint simplify PCB design for panel-mount controllers.
Recommended
USB-Based Test and Measurement Instruments
The ATSAMG55J19B-AUT is a strong fit for USB test instruments because it integrates a USB 2.0 Full-Speed device PHY and a 12-bit ADC, allowing direct USB streaming of digitized signals at up to 1 MSPS. The 120 MHz Cortex-M4F runs calibration, FFT, and protocol decoding, while 176 KB SRAM buffers waveform captures. Industrial temperature range and 64-LQFP footprint ease enclosure integration for portable benchtop tools.
Recommended
Wireless Audio Receiver Base Stations
The ATSAMG55J19B-AUT serves wireless audio receiver base stations where Bluetooth or proprietary 2.4 GHz radios feed I2S data into the MCU for processing and routing. The I2S interface accepts up to 192 kHz / 32-bit streams from external radio modules, the FPU runs audio post-processing, and USB Host mode supports USB mass-storage playback of local audio files. Wide supply range lets the MCU run directly from a 3.3 V regulated rail.
Recommended
Connected LED Lighting and DMX Controllers
The ATSAMG55J19B-AUT drives connected LED lighting systems by using its multiple PWM channels for color-mixing, plus USART for DMX512 / Art-Net protocol bridging. The 120 MHz Cortex-M4F executes gamma correction and color-space conversion natively, while 176 KB SRAM handles LED frame buffers. Industrial temperature rating supports outdoor luminaire designs, and the 64-LQFP package enables compact driver PCB layouts.
Recommended
Recommended Products Summary
Engineering reference data for ATSAMG55J19B-AUT β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAMG55J19B-AU | ATSAMG55J19A-AUT | ATSAME53N19A-AU | ATSAME54P19A-AU | STM32F411CEU6 |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | STMicroelectronics |
| Package | 64-LQFP (10x10 mm) | 64-LQFP (10x10 mm) - same | 64-LQFP (10x10 mm) - same | 64-LQFP (10x10 mm) - same | 64-LQFP (10x10 mm) - same | 64-LQFP (10x10 mm) - same |
| Core | ARM Cortex-M4F | ARM Cortex-M4F | ARM Cortex-M4F | ARM Cortex-M4F | ARM Cortex-M4F | ARM Cortex-M4F |
| Max Clock Frequency | 120 MHz | 120 MHz | 120 MHz | 120 MHz | 120 MHz | 100 MHz |
| Flash Memory | 512 KB | 512 KB | 512 KB | 512 KB | 512 KB | 512 KB |
| SRAM | 176 KB | 176 KB | 176 KB | 192 KB | 192 KB | 128 KB |
| USB PHY | USB 2.0 Full-Speed on-chip | USB 2.0 Full-Speed on-chip | USB 2.0 Full-Speed on-chip | USB 2.0 Full-Speed on-chip | USB 2.0 Full-Speed on-chip | USB 2.0 Full-Speed on-chip |
| I2S Audio Interface | Yes (hardware I2S) | Yes | Yes | Yes (I2S with PDM) | Yes (I2S with PDM) | Yes (I2S, partial) |
| Operating Voltage | 1.62 V to 3.6 V | 1.62 V to 3.6 V | 1.62 V to 3.6 V | 1.62 V to 3.6 V | 1.62 V to 3.6 V | 1.7 V to 3.6 V |
| Delivery Form | Tape & Reel (AUT) | Tray (AU) | Tape & Reel (AUT) | Tray (AU) | Tray (AU) | Tray |
Key Differentiators
- On-chip USB 2.0 Full-Speed PHY (vs ATSAM4S16CA-AU)
- Integrated hardware I2S digital audio interface (vs ATSAM4S16CA-AU)
- Cortex-M4F with FPU for DSP workloads (vs STM32F411CEU6)
- Drop-in compatibility with SAM G55 family (vs ATSAMG55J19A-AUT)
Design Notes
Place a 100 nF decoupling capacitor as close as possible (within 3 mm) to each VDDIO and VDDCORE pin. Add a bulk 4.7 uF ceramic capacitor near the main VDDIO supply pin. Per Microchip's SAM G55 hardware design guide, the high-frequency decoupling network keeps core voltage ripple below 50 mVpp at 120 MHz operation. Route all power traces at least 0.5 mm wide to limit DC drop during USB current peaks.
For USB applications, maintain 90 ohm differential impedance between the HDP and HDM pins and the USB connector. Per the SAM G55 datasheet, the trace length matching should be within 150 mil (3.8 mm), and the ESD protection diode should be placed within 3 mm of the connector. Keep the USB differential pair away from clock lines and switching power supplies to meet USB 2.0 Full-Speed signal-integrity masks.
Do not skip the 12 MHz external crystal on XIN/XOUT even when using the internal 12 MHz RC oscillator - the USB Full-Speed PHY requires the accurate external clock reference for USB compliance. The NRST pin must be pulled up to VDDIO with a 10 kohm resistor and decoupled with 100 nF to ground for reliable reset behavior. When migrating from SAM G55 A-revision to B-revision silicon, review errata document for any peripheral timing changes.
Keep SWDIO and SWCLK traces short (under 50 mm) and away from high-current switching signals. Add 100 kohm pull-ups on SWDIO and NRST for robust debugger connection. When using trace debugging via SWO, ensure the SWO pin has a 50 ohm series termination to minimize reflections on the trace output.
Compliance Information
RoHS and REACH compliance per Microchip product page. AEC-Q100 not applicable for industrial-grade part; AEC-Q100 qualified variants would be in a different ordering code.
