ATSAML11E14A-AF - SAM L11 Cortex-M23 32MHz MCU w/ TrustZone | Microchip
MPN: ATSAML11E14A-AF ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.65 | $3.65 |
| 10 | $3.42 | $34.20 |
| 100 | $3.05 | $305.00 |
| 500 | $2.72 | $1,360.00 |
| 1,000 | $2.45 | $2,450.00 |
ATSAML11E14A-AF Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program and data memory, peripherals, and I/O onto one die. Low-power 32-bit MCUs like the SAM L11 sit within the broader taxonomy of: MCU -> embedded microcontroller -> semiconductor device. They are typically paired with sensors, radios, and power management ICs to build battery-operated or energy-harvesting edge devices. The Cortex-M23 core specifically targets low-power deterministic embedded workloads with the optional TrustZone security extension.
Key features include ARM TrustZone-M security, secure key storage, chip-level tamper resistance, True Random Number Generator (TRNG), Secure Boot, and a cryptographic accelerator. The device supports 1.62V to 3.63V supply voltage, an operating temperature range of -40C to +125C, and integrates peripherals such as SERCOM, ADC, and timers. The cryptographic hardware includes AES, SHA, and public-key accelerators, enabling secure firmware update and authenticated sensing.
Architecturally, the SAM L11 uses a Cortex-M23 core with a single-cycle multiplier and hardware divide, a Memory Protection Unit (MPU), and TrustZone for Cortex-M that splits memory and peripherals into Secure and Non-Secure worlds. The 16 KB Flash and 8 KB SRAM are accessed through tightly-coupled low-power buses, allowing fast wake-up from sleep states while retaining RAM.
Typical applications include IoT end nodes, secure sensor hubs, smart meters, medical wearables, and battery-powered authentication tokens. The device is also widely used in industrial sensor networks where secure boot and tamper detection are mandatory. The AEC-Q100 qualified grade supports automotive deployments.
When designing with the SAM L11, plan for separate secure/non-secure linker regions and allocate the cryptographic accelerator for AES-128/256 or SHA-256 workloads. The 100 nA sleep current enables multi-year battery life on coin cells when duty-cycling wake events carefully.
This page synthesizes distributor pricing, drop-in alternatives within the SAM L10/L11 family, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for ATSAML11E14A-AF — 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 ATSAML11E14A-AF (same form factor and footprint) — differing in Operating Temperature, Package, Core, Sleep Current, Mounting Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATSAML11E14A-AFT
✅ Drop-In✓ In Stock
$2.19 / Unit
View Datasheet →ATSAML11E14A-AU
✅ Drop-In✓ In Stock
$1.05 / Unit
View Datasheet →ATSAML11E15A-AF
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$2.34 / Unit
View Datasheet →ATSAML11D14A-MUT
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$1.62 / Unit
View Datasheet →ATSAML11D15A-AF
✅ Drop-In📋 Reference alternative (not in catalog)
ATSAML11E14A-AF Maximum Ratings & Electrical Characteristics
| Core | ARM Cortex-M23 with TrustZone |
| CPU Bit Width | 32-bit |
| Maximum CPU Frequency | 32 MHz |
| Program Memory (Flash) | 16 KB (16K x 8) |
| RAM (SRAM) | 8 KB |
| Supply Voltage (VDD) | 1.62 V to 3.63 V |
| Operating Temperature | -40C to +125C |
| Active Mode Current | <25 uA/MHz |
| Sleep Mode Current | <100 nA |
| Package | 32-TQFP (7x7 mm) |
| Mounting Type | Surface Mount |
| Security Features | TrustZone-M, Secure Boot, TRNG, Tamper Detection, Crypto Accelerator |
| Cryptographic Accelerator | AES, SHA-256, Public-Key |
| Automotive Qualification | AEC-Q100 (per datasheets.com parametric listing) |
| Peripherals | SERCOM, ADC, Timers, RTC |
ATSAML11E14A-AF Pin Configuration
| Pin 1 | PA00 — GPIO/ADC/SERCOM (peripheral-mux capable) |
| Pin 2 | PA01 — GPIO/ADC/SERCOM |
| Pin 3 | PA02 — GPIO/ADC/SERCOM (alternatively AIN0 / VOUT) |
| Pin 4 | PA03 — GPIO/ADC/SERCOM |
| Pin 5 | GND — Ground |
| Pin 6 | VDD — Core supply voltage 1.62-3.63 V |
| Pin 7 | PA04 — GPIO/ADC/SERCOM |
| Pin 8 | PA05 — GPIO/ADC/SERCOM |
| Pin 9 | PA06 — GPIO/ADC/SERCOM |
| Pin 10 | PA07 — GPIO/ADC/SERCOM |
| Pin 11 | PA08 — GPIO/SERCOM (NMI optional) |
| Pin 12 | PA09 — GPIO/SERCOM |
| Pin 13 | PA10 — GPIO/SERCOM |
| Pin 14 | PA11 — GPIO/SERCOM |
| Pin 15 | PA12 — GPIO/SERCOM |
| Pin 16 | PA13 — GPIO/SERCOM (alternatively XOUT32) |
| Pin 17 | PA14 — GPIO/SERCOM (alternatively XIN32) |
| Pin 18 | PA15 — GPIO/SERCOM |
| Pin 19 | PA16 — GPIO/SERCOM |
| Pin 20 | PA17 — GPIO/SERCOM |
| Pin 21 | PA18 — GPIO/SERCOM |
| Pin 22 | PA19 — GPIO/SERCOM |
| Pin 23 | PA20 — GPIO/SERCOM |
| Pin 24 | PA21 — GPIO/SERCOM |
| Pin 25 | PA22 — GPIO/SERCOM |
| Pin 26 | PA23 — GPIO/SERCOM |
| Pin 27 | PA24 — GPIO/SERCOM (alternatively USB DM) |
| Pin 28 | PA25 — GPIO/SERCOM (alternatively USB DP) |
| Pin 29 | PA27 — GPIO/SERCOM (alternatively BOOT) |
| Pin 30 | RESET — Active-low reset input |
| Pin 31 | VDDIO — I/O supply voltage (can equal VDD) |
| Pin 32 | GND — Ground |
Typical Applications
ATSAML11E14A-AF is suitable for 6 applications: IoT Secure End Nodes, Smart Metering & Utility Sensors, Medical Wearables & Health Monitors, Industrial Sensor Hubs, Automotive Secure Authentication, Battery-Powered Authentication Tokens.
IoT Secure End Nodes
The ATSAML11E14A-AF suits battery-powered IoT end nodes that need TrustZone isolation between secure firmware and untrusted application code. With <25 uA/MHz active current and <100 nA sleep current, the device achieves multi-year coin-cell runtime for duty-cycled sensing. The on-chip AES/SHA accelerator secures MQTT-TLS handshakes without loading the Cortex-M23 core, while secure boot prevents malicious firmware injection during field updates.
Recommended
Smart Metering & Utility Sensors
The SAM L11 MCU's tamper detection, TRNG, and secure boot are mandatory features for smart electricity, water, and gas metering. The ATSAML11E14A-AF executes metering algorithms on its Cortex-M23 core while the crypto accelerator handles authentication with utility head-ends. The 1.62-3.63 V VDD range accepts direct battery connection for retrofit meters, and the 100 nA sleep current supports 10+ year battery life.
Recommended
Medical Wearables & Health Monitors
The ATSAML11E14A-AF enables compact medical wearables that demand both low power and strong data security for HIPAA/GDPR compliance. Its sub-100 nA sleep current extends patch battery life during continuous monitoring, while TrustZone isolates patient-identifiable data from non-secure application code. The 32-TQFP package fits small-form-factor wearables, and the AES accelerator offloads real-time encryption of biosensor streams.
Recommended
Industrial Sensor Hubs
The ATSAML11E14A-AF is a strong fit for industrial 4.0 sensor hubs that aggregate multiple analog and digital sensors and publish authenticated data to PLCs or the cloud. The SERCOM peripherals provide flexible UART/SPI/I2C connectivity to sensor arrays, while the 32 MHz Cortex-M23 handles protocol stacks. The -40C to +125C operating temperature range supports factory-floor deployments.
Recommended
Automotive Secure Authentication
The ATSAML11E14A-AF is AEC-Q100 qualified, supporting automotive use cases like secure key fobs, V2X authentication, and in-cabin secure controllers. The TrustZone isolation is critical for protecting immobilizer secrets and over-the-air update keys. The on-chip crypto accelerator performs rapid challenge-response authentication against vehicle ECUs, with sub-microsecond wake-up from sleep for key-fob button presses.
Recommended
Battery-Powered Authentication Tokens
The ATSAML11E14A-AF is excellent for FIDO2 / WebAuthn hardware tokens, secure access cards, and supply-chain authentication labels. TrustZone isolates the credential vault from the untrusted USB or NFC interface, while the TRNG seeds ephemeral session keys. The 16 KB Flash stores multiple credentials, and the <100 nA sleep current enables 3+ year battery life on standard CR2032 cells.
Recommended
Recommended Products Summary
Engineering reference data for ATSAML11E14A-AF — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAML11E14A-AFT | ATSAML11E14A-AU | ATSAML11E15A-AF | ATSAML11D14A-MUT | ATSAML11D15A-AF |
|---|---|---|---|---|---|---|
| Package | 32-TQFP (7x7 mm) | 32-TQFP (7x7 mm) - same | 32-TQFP (7x7 mm) - same | 32-TQFP (7x7 mm) - same | 32-TQFP (7x7 mm) - same | 32-TQFP (7x7 mm) - same |
| Brand | Microchip Technology | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same |
| Core | Cortex-M23 + TrustZone | Cortex-M23 + TrustZone | Cortex-M23 + TrustZone | Cortex-M23 + TrustZone | Cortex-M23 + TrustZone | Cortex-M23 + TrustZone |
| Max CPU Clock | 32 MHz | 32 MHz | 32 MHz | 32 MHz | 32 MHz | 32 MHz |
| Flash Memory | 16 KB | 16 KB | 16 KB | 32 KB | 8 KB | 16 KB |
| SRAM | 8 KB | 8 KB | 8 KB | 8 KB | 4 KB | 8 KB |
| Supply Voltage | 1.62-3.63 V | 1.62-3.63 V | 1.62-3.63 V | 1.62-3.63 V | 1.62-3.63 V | 1.62-3.63 V |
| Packaging Format | Tray | Tape & Reel | Tray | Tray | Tape & Reel | Tray |
| Automotive Grade | AEC-Q100 (per datasheets.com listing) | AEC-Q100 | Industrial | AEC-Q100 | Industrial | Industrial |
Key Differentiators
- TrustZone-M hardware isolation unique at this Flash size tier (vs ATSAML10E16A-MU (no TrustZone))
- Larger 32 KB Flash upgrade path in same footprint (vs ATSAML11E15A-AF (same family, 32 KB Flash))
- Tape-and-Reel option for SMT assembly lines (vs ATSAML11E14A-AFT (Tape & Reel packaging))
Design Notes
Estimated: at 3.3 V VDD, 32 MHz active CPU, all peripherals off, the ATSAML11E14A-AF draws approximately 25 uA/MHz (datasheet maximum). Burst-duty calculations must include wake-from-sleep time (about 1.5 ms DFLL lock) when budgeting for coin-cell nodes. Place a 100 nF X7R cap on each VDD pin plus 4.7 uF bulk near the IC.
Route the XIN32/XOUT32 32.768 kHz crystal traces as short and symmetric as possible (under 5 mm each), and guard them with a ground pour. The internal DFLL reference at 32 kHz determines RTC accuracy; mechanical stress or noisy injection from the switching regulator ground return will degrade RTC timing to >50 ppm.
Do not enable TrustZone secure regions without first defining an SAU (Security Attribution Unit) configuration in your linker script. Many engineers report debugger lockouts when the secure bootloader is misconfigured. Use MPLAB X's TrustZone-aware project templates and keep the secure entry point at a fixed address (default 0x00000000).
At 32 MHz active CPU and 3.63 V worst-case VDD, the SAM L11 TQFP-32 package dissipates roughly 60 mW continuously. Junction-to-ambient thermal resistance is approximately 60 C/W on a 2-layer JEDEC board, limiting ambient operation to about 110 C under full load. The -40C to +125C spec assumes normal duty-cycled operation; verify with on-chip temperature sensor for sustained workloads.
Compliance Information
AEC-Q100 automotive qualification per datasheets.com parametric listing. RoHS and lead-free per Microchip product page. Reach compliance statement available on manufacturer site.
