ATMEGA4808-XUR - 8-bit AVR MCU 20MHz 48KB Flash | Microchip
Référence : ATMEGA4808-XUR ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $1.68 | $1,68 |
| 10 | $1.51 | $15,10 |
| 100 | $1.29 | $129,00 |
| 500 | $1.14 | $570,00 |
| 1 000 | $0.98 | $980,00 |
ATMEGA4808-XUR Présentation
An 8-bit microcontroller is a self-contained computing IC integrating a CPU core, program memory (Flash), data memory (SRAM), non-volatile data storage (EEPROM), and a rich set of peripherals on a single die. Within the system hierarchy, the megaAVR 0-series sits in Microchip's general-purpose MCU portfolio, positioned below 32-bit ARM-based MCUs and above the tinyAVR and classic AVR families, serving the broader category of embedded processors and power-management/automation control ICs.
Key features of the ATMEGA4808 include 20 MHz maximum CPU frequency, 48 KB of Flash program memory with self-programmability, 6 KB of SRAM for data and stack, and 256 bytes of EEPROM for parameter retention. The megaAVR 0-series is rated for Functional Safety (FuSa) applications, an important differentiator for safety-relevant industrial designs. The AVR core includes a hardware multiplier for efficient arithmetic, and the series uses the latest AVR Core architecture with an event system and flexible peripherals.
The ATmega4808 is offered in 28- and 32-pin packages (the ATmega4809 extends the family to 40- and 48-pin packages with more I/O). Per the ATmega4808/4809 datasheet (DS40002173B), the family shares the same peripheral set across package options, which simplifies migration between memory and pin-count variants. The 28-pin SSOP package is a 0.65 mm-pitch wide-body outline that hand-solders easily and suits cost-sensitive board layouts.
Typical applications include industrial automation and control nodes, consumer appliances, IoT sensor endpoints, motor-control helpers, and general embedded products that need moderate Flash density (48 KB), hardware multiplier math capability, and Functional Safety support at low cost.
A key design consideration is the megaAVR 0-series register architecture, which differs from classic AVR parts such as the ATmega328P: code using direct port/register access is not binary-compatible, so library and toolchain migration (for example, MegaCoreX for Arduino) should be planned. Verify the full pinout in the manufacturer datasheet before PCB layout.
This page synthesizes distributor pricing, same-family drop-in alternatives, comparison tables, and practical design notes not found in the manufacturer datasheet, providing a single reference for selection and second-sourcing decisions.
Alternatives de remplacement direct pour ATMEGA4808-XUR — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec ATMEGA4808-XUR (même facteur de forme et même empreinte) — différant par Core Processor, Package, Flash Memory, Operating Temperature, Peripherals.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
ATMEGA4809-XUR
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
ATMEGA4808-XFR
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
ATMEGA3208-XUR
✅ Remplacement direct ⚠️ Spécifications non vérifiées✓ En stock
$0.82 / unité
Voir la fiche technique →ATMEGA1608-XUR
✅ Remplacement direct ⚠️ Spécifications non vérifiées✓ En stock
$0.86 / unité
Voir la fiche technique →ATMEGA808-XUR
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
ATMEGA4808-XUR Valeurs maximales et caractéristiques électriques
| Core Processor | AVR (megaAVR 0-series), 8-bit with hardware multiplier |
| Core Size | 8-bit |
| Fréquence d'horloge maximale | 20 MHz |
| Flash Memory Size | 48 KB (24K x 16) |
| SRAM Size | 6 KB |
| EEPROM Size | 256 bytes |
| Boîtier | 28-SSOP |
| Type de montage | Surface Mount |
| Product Family | megaAVR 0-series |
| Functional Safety (FuSa) | Yes (rated for Functional Safety applications) |
| Package Family Options | 28-pin and 32-pin (this variant: 28-pin) |
Guide de configuration des broches du ATMEGA4808-XUR 28-pin and 32-pin (this variant: 28-pin)
Configuration des broches du ATMEGA4808-XUR (boîtier 28-pin and 32-pin (this variant: 28-pin)). Ce circuit intégré numérique comprend des GPIO, des interfaces de communication (UART, SPI, I2C) et des broches d'alimentation. Consultez la fiche technique du fabricant pour les fonctions alternatives des broches et les options de configuration. Indispensable pour la conception de systèmes embarqués et la conception de circuits imprimés.
Aucune donnée de brochage détaillée disponible pour ATMEGA4808-XUR.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
ATMEGA4808-XUR convient pour 6 applications: Industrial Automation and Control Nodes, Consumer Appliance Control, IoT Sensor Endpoints, Motor Control Support and PWM Generation, Test and Measurement Accessories, Home Automation and Smart Devices.
Industrial Automation and Control Nodes
The ATMEGA4808-XUR fits industrial automation nodes because its Functional Safety (FuSa) rating, 20 MHz AVR core with hardware multiplier, and 48 KB Flash support control loops, protocol stacks, and safety-relevant logic in a single low-cost device. In a typical node it runs MODBUS/UART or I2C communication, handles sensor polling and PWM actuator output, and retains calibration data in the 256-byte EEPROM. The 6 KB SRAM accommodates ring buffers and modest state machines. Placed on a 28-SSOP footprint, it hand-solders for prototyping and reflows reliably in production, and the 0-series event system reduces CPU load in deterministic polling designs.
Recommandé
Consumer Appliance Control
Appliance boards need low unit cost, adequate Flash for UI logic, and reliable non-volatile storage - exactly the ATMEGA4808-XUR profile. The 48 KB Flash holds menu structures, display drivers, and communication code without external memory, while the 256-byte EEPROM preserves user settings across power cycles. The hardware multiplier accelerates scaling math for sensor linearization (NTC lookups, PID terms). With a 20 MHz clock, button scanning, LED/LCD driving, and buzzer timing run comfortably within interrupt budgets. The 28-SSOP wide-body package with 0.65 mm pitch keeps assembly costs low on two-layer consumer PCBs, and family pin-compatibility allows 8 KB or 16 KB variants on cost-reduced models.
Recommandé
IoT Sensor Endpoints
For battery- and line-powered IoT sensor endpoints, the ATMEGA4808-XUR provides the processing headroom to run sensor drivers, packet framing, and light encryption, while its AVR architecture supports low-power sleep modes between samples (per datasheet DS40002173B peripheral/sleep features). The 48 KB Flash accommodates a communication stack plus firmware-update headroom, and the 6 KB SRAM buffers multiple sensor payloads before a radio burst. The hardware multiplier speeds up fixed-point filtering and CRC computation. On the 28-SSOP footprint, the MCU pairs cleanly with a UART/I2C radio module, keeping the endpoint BOM to two ICs, and the FuSa rating helps when endpoints feed safety-monitored systems.
Recommandé
Motor Control Support and PWM Generation
The ATMEGA4808-XUR is well suited as the PWM generator and supervisory MCU in small motor-control boards. The 20 MHz AVR core with hardware multiplier executes fixed-point PI loops quickly, and 0-series timers produce multi-channel PWM outputs for MOSFET gate drivers. The 48 KB Flash leaves room for fault diagnostics, communication (UART to a host controller), and field firmware updates, while the 256-byte EEPROM stores configuration and fault counters. Its FuSa rating is an advantage when the motor subsystem requires documented safety justification. Use the 28-SSOP variant for boards where hand-inspection of QFP packages is impractical; 6 KB SRAM handles multi-axis state tracking for small drive designs.
Recommandé
Test and Measurement Accessories
Bench accessories - sensor bridges, calibrators, front-panel controllers - benefit from the ATMEGA4808-XUR's balance of math performance and memory. The hardware multiplier and 20 MHz core support fixed-point averaging, scaling, and calibration corrections at sample rates suitable for panel displays; the 48 KB Flash stores multi-language UI strings and self-test routines, and the EEPROM keeps calibration constants without external NVM. The FuSa designation suits test equipment feeding safety workflows. On a 28-SSOP footprint the part integrates with USB-UART bridges or SPI display controllers on a two-layer board. Its register-level compatibility with the rest of the megaAVR 0-series lets one firmware codebase span accessory tiers built on the 808/1608/3208 variants.
Recommandé
Home Automation and Smart Devices
Smart plugs, thermostats, and lighting controllers use the ATMEGA4808-XUR as the main controller: its 48 KB Flash runs protocol handling and scheduling logic, the 20 MHz core with hardware multiplier manages real-time tasks such as zero-cross detection and dimming timing, and the EEPROM holds network configuration and schedules through power loss. The FuSa rating supports devices with safety-relevant shutoff features. The 28-SSOP package simplifies hand rework during certification iterations, and the shared footprint with ATMEGA808/1608/3208 lets one PCB design scale across a product line by changing only the MCU order code. The event system offloads peripheral-triggered tasks, improving responsiveness at low CPU load.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour ATMEGA4808-XUR — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | ATMEGA4809-XUR | ATMEGA4808-XFR | ATMEGA3208-XUR | ATMEGA1608-XUR |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SSOP | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same |
| Core / Architecture | 8-bit AVR, megaAVR 0-series, hardware multiplier | 8-bit AVR, megaAVR 0-series, hardware multiplier | 8-bit AVR, megaAVR 0-series, hardware multiplier | 8-bit AVR, megaAVR 0-series, hardware multiplier | 8-bit AVR, megaAVR 0-series, hardware multiplier |
| Max Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Flash Memory | 48 KB (24K x 16) | 48 KB | 48 KB | 32 KB | 16 KB |
| SRAM | 6 KB | 6 KB | 6 KB | 4 KB | 2 KB |
| Functional Safety (FuSa) | Yes | Yes | Yes | Yes | Yes |
| Temperature Grade (order code) | -U grade (XUR) | -U grade (XUR) | -F industrial grade (XFR) | -U grade (XUR) | -U grade (XUR) |
Principaux différenciateurs
- Functional Safety (FuSa) rating on a low-cost 8-bit MCU (vs ATMEGA328P-MU)
- Largest Flash in the pin-compatible 28-SSOP family (vs ATMEGA3208-XUR)
- Same die, multiple temperature grades on one layout (vs ATMEGA4808-XFR)
- More I/O than the 4808 for the same Flash (vs ATMEGA4809-XUR)
Notes de conception
The megaAVR 0-series register map is NOT compatible with classic AVRs (ATmega328P, ATmega32A). Code that writes directly to PORTB-style classic registers, or libraries written for classic AVR SFRs, will not compile or will behave incorrectly on the ATmega4808. Use the 0-series register API (PORT_t structures, event system) or a portable layer such as MegaCoreX for Arduino. Plan migration time into the schedule when porting legacy classic-AVR firmware - this is the single most common pitfall reported in community forums.
The 28-SSOP is a 0.65 mm-pitch wide-body outline; use the exact footprint from datasheet DS40002173B (or the IPC-recommended SSOP-28 land pattern) and do not copy footprints from the 32-pin or 48-pin family variants, as pin assignments differ by package. Place a 100 nF ceramic decoupling capacitor directly at each VDD pin with a short return path to GND, plus bulk capacitance per the Microchip datasheet power-supply recommendations. Expose GND through a solid ground plane to keep ADC and clock integrity.
Before locking the design, verify the supply-voltage versus maximum-frequency operating envelope in datasheet DS40002173B: the 20 MHz rating applies at the nominal supply voltage, and running the CPU near 20 MHz below the datasheet-specified voltage for that frequency is out of specification. If your design sleeps most of the time, consult the datasheet power-management chapter for sleep-mode peripheral availability. Estimated: for a 5 V, 20 MHz design, confirm VDD range per datasheet tables rather than assuming the classic-AVR 2.7-5.5 V spread.
Informations de conformité
Compliance status not stated in the provided web data. The -UR suffix on Microchip ordering codes conventionally denotes the Green/RoHS tape-and-reel variant, but this must be confirmed on the official Microchip product page before relying on it.
