ATMEGA88A-MUR - 8-bit AVR MCU, 8KB Flash 20MHz | Microchip
MPN: ATMEGA88A-MUR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.31 | $2.31 |
| 10 | $2.08 | $20.80 |
| 100 | $1.85 | $185.00 |
| 500 | $1.67 | $835.00 |
| 1,000 | $1.49 | $1,490.00 |
| 3,000 | $1.38 | $4,140.00 |
ATMEGA88A-MUR Overview
An 8-bit AVR microcontroller is a complete self-contained computing system on a single chip, combining a RISC processor core, program memory, SRAM, EEPROM, timers, and analog peripherals such as ADC and analog comparators. Microcontrollers sit at the lowest level of the embedded systems hierarchy: microcontroller -> embedded processor -> MCU families like the AVR ATmega series, which are programmed in C or assembly through development tools such as MPLAB X and AVR-GCC, and debugged in-circuit via ICSP using tools like the MPLAB SNAP.
Key features of the ATMEGA88A include 8KB ISP Flash with read-while-write capability, 512B EEPROM, 1KB SRAM, 23 general-purpose I/O lines, and 32 general-purpose working registers. The AVR enhanced RISC core executes 130 powerful instructions, most in a single clock cycle, delivering up to 20 MIPS throughput at 20MHz. The picoPower technology provides multiple sleep modes with very low active and idle power consumption.
The ATmega88A architecture includes three flexible timers/counters with compare modes (two 8-bit and one 16-bit), internal and external interrupt sources, a serial programmable USART, an SPI serial interface, a two-wire interface (I2C-compatible), an 8-channel 10-bit ADC with differential mode, and an internal calibrated RC oscillator. The wide supply voltage range of 1.8V to 5.5V supports battery-powered designs as well as 5V industrial systems.
Typical applications include industrial automation and sensor nodes, home appliance and HVAC control boards, and battery-powered portable devices where low standby power matters. The 32-VQFN (5x5 mm) package saves board area versus TQFP while retaining full peripheral access.
When designing with this device, reserve the PC6/RESET pin for in-circuit serial programming and follow the datasheet power-supply decoupling recommendations for the exposed pad.
This page synthesizes verified distributor pricing, drop-in alternatives, pinout data, and practical design notes not consolidated in the manufacturer datasheet.
Drop-in alternatives for ATMEGA88A-MUR — 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 ATMEGA88A-MUR (same form factor and footprint) — differing in Package, Operating Temperature, ADC Resolution, Communication Interfaces, Flash Memory.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATMEGA88PA-MUR
✅ Drop-In✓ In Stock
$0.71 / Unit
View Datasheet →ATMEGA88A-MU
✅ Drop-In📋 Reference alternative (not in catalog)
ATMEGA88-20MU
✅ Drop-In✓ In Stock
Contact for price
View Datasheet →ATMEGA168A-MUR
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$1.85 / Unit
View Datasheet →ATMEGA48PA-MUR
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$0.98 / Unit
View Datasheet →ATMEGA88A-MUR Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit AVR RISC |
| Program Memory Size | 8 KB (4K x 16) Flash |
| EEPROM Size | 512 B |
| SRAM Size | 1 KB |
| Maximum Clock Speed | 20 MHz |
| Supply Voltage Range | 1.8 V to 5.5 V |
| General Purpose I/O | 23 I/O lines |
| Working Registers | 32 x 8-bit |
| ADC Resolution | 10-bit, 8 channels |
| Timers/Counters | Two 8-bit, one 16-bit |
| Communication Interfaces | USART, SPI, TWI (I2C-compatible) |
| Package | 32-VQFN (5x5 mm) with exposed pad |
| Mounting Type | Surface Mount |
| Operating Temperature | -40C to +85C (industrial) |
| Sleep Modes / Power Technology | picoPower, multiple sleep modes |
| RoHS Status | Compliant (green package) |
| Debug / Programming | ICSP via MPLAB SNAP (debugWIRE) |
ATMEGA88A-MUR Pin Configuration
| Pin 1 | PD3 — Port D, bit 3 (GPIO / analog comparator negative input) |
| Pin 2 | PD4 — Port D, bit 4 (GPIO / analog comparator positive input) |
| Pin 3 | GND — Ground |
| Pin 4 | VCC — Digital supply voltage |
| Pin 5 | GND — Ground |
| Pin 6 | VCC — Digital supply voltage |
| Pin 7 | PB6/XTAL1/TOSC1 — Port B bit 6 / crystal oscillator input / timer oscillator input |
| Pin 8 | PB7/XTAL2/TOSC2 — Port B bit 7 / crystal oscillator output / timer oscillator output |
| Pin 9 | PD5 — Port D, bit 5 (GPIO) |
| Pin 10 | PD6 — Port D, bit 6 (GPIO) |
| Pin 11 | PD7 — Port D, bit 7 (GPIO) |
| Pin 12 | PB0 — Port B, bit 0 (GPIO / ICP1 input capture) |
| Pin 13 | PB1 — Port B, bit 1 (GPIO / OC1A PWM output) |
| Pin 14 | PB2 — Port B, bit 2 (GPIO / SS SPI slave select) |
| Pin 15 | PB3/MOSI/OC2A — Port B bit 3 / SPI master output / Timer2 PWM output |
| Pin 16 | PB4/MISO — Port B bit 4 / SPI master input |
| Pin 17 | PB5/SCK — Port B bit 5 / SPI clock |
| Pin 18 | AVCC — ADC supply voltage |
| Pin 19 | ADC6 — ADC input channel 6 |
| Pin 20 | AREF — ADC analog reference |
| Pin 21 | GND — Ground |
| Pin 22 | ADC7 — ADC input channel 7 |
| Pin 23 | PC0/ADC0 — Port C bit 0 / ADC channel 0 |
| Pin 24 | PC1/ADC1 — Port C bit 1 / ADC channel 1 |
| Pin 25 | PC2/ADC2 — Port C bit 2 / ADC channel 2 |
| Pin 26 | PC3/ADC3 — Port C bit 3 / ADC channel 3 |
| Pin 27 | PC4/ADC4/SDA — Port C bit 4 / ADC channel 4 / TWI data |
| Pin 28 | PC5/ADC5/SCL — Port C bit 5 / ADC channel 5 / TWI clock |
| Pin 29 | PC6/RESET — Reset input / debugWIRE pin |
| Pin 30 | PD0/RXD — Port D bit 0 / USART receive |
| Pin 31 | PD1/TXD — Port D bit 1 / USART transmit |
| Pin 32 | PD2/INT0 — Port D bit 2 / external interrupt 0 |
Typical Applications
ATMEGA88A-MUR is suitable for 6 applications: Industrial Automation and Sensor Nodes, Home Appliance Control, Battery-Powered Portable Devices, Motor Control (Small DC and Stepper), Embedded HMI and Display Control, Hobby, Maker, and Educational Boards.
Industrial Automation and Sensor Nodes
The ATMEGA88A-MUR fits factory floor sensor nodes because its industrial temperature rating, 1.8V to 5.5V supply tolerance, and 10-bit ADC allow direct connection of analog transducers without external conversion. The SPI and TWI interfaces link to external EEPROM or network transceivers, while the 16-bit Timer/Counter1 generates PWM for actuator control. Its picoPower sleep modes let battery-backed nodes idle at microamp-level current between polling cycles. With 8KB Flash, a Modbus-style UART protocol plus sensor conditioning firmware fits comfortably; if the application grows, the pin-compatible ATMEGA168A-MUR doubles program memory with no PCB change.
Recommended
Home Appliance Control
Appliance and HVAC control boards benefit from the ATMEGA88A-MUR's robust 5V operation, 23 GPIO lines, and multiple PWM-capable timers. A typical design drives triac or relay outputs from GPIO, reads NTC temperature sensors through the 10-bit ADC, and handles user buttons and LED indicators on the remaining ports. The internal calibrated RC oscillator removes the crystal from cost-sensitive boards, and the watchdog timer plus brown-out detection improve safety in mains-powered environments. Because 20 MIPS at 20MHz is far above the compute need of most appliance loops, the core spends most time in idle sleep, reducing conducted EMI and power consumption on standby rails.
Recommended
Battery-Powered Portable Devices
For portable and coin-cell powered products, the ATMEGA88A-MUR's picoPower architecture with multiple sleep modes and a 1.8V low-end supply range extends battery life. The device wakes from sleep on external interrupts or watchdog timeouts, samples a sensor through the 10-bit ADC, and transmits over USART or TWI before returning to sleep. Operating at reduced clock near 1.8V keeps the system within the frequency-versus-VCC safe operating curve. The 512B EEPROM preserves calibration data through battery replacement. Designers targeting maximum sleep efficiency should consider the pin-compatible ATMEGA88PA-MUR, whose P-die further reduces active and idle consumption.
Recommended
Motor Control (Small DC and Stepper)
The ATMEGA88A-MUR controls small DC motors and steppers using PWM outputs from its 8-bit and 16-bit timers driving external MOSFET or H-bridge drivers. The 10-bit differential ADC reads shunt current or back-EMF feedback, and input capture on Timer1 can decode encoder or Hall signals with hardware timestamping. At 20MHz, a closed-loop PI controller runs at kilohertz rates with large margin. The wide 1.8V to 5.5V supply allows the MCU to share the logic rail of the gate driver. For applications requiring CAN or a programmable serial controller, Microchip's ATmega64M1 family provides an upgrade path within the same AVR ecosystem.
Recommended
Embedded HMI and Display Control
The ATMEGA88A-MUR serves as a keypad scanner and display controller for small embedded HMIs. Twenty-three GPIO lines drive a multiplexed seven-segment or character LCD arrangement and read a matrix keypad, while the USART or TWI port talks to a host processor or an OLED driver chip. Its 8KB Flash comfortably holds a lookup-table font, menu state machine, and serial protocol. The 16-bit timer generates backlight PWM dimming with hardware, offloading the core. In a typical split-HMI architecture, this MCU handles the real-time user interface locally while sleeping in idle mode between key events, keeping standby draw low on always-on appliances.
Recommended
Hobby, Maker, and Educational Boards
The ATMEGA88A family is a staple of maker and educational platforms because it is inexpensive, programmable via a low-cost ISP cable or MPLAB SNAP, and supported by the mature AVR-GCC and Arduino-compatible toolchains. The 32-VQFN (5x5 mm) MUR variant suits compact student PCBs, while the same silicon in DIP (ATMEGA88A-PU) supports breadboard teaching. The debugWIRE feature enables single-wire in-circuit debugging on the reset pin, which teaches professional workflows without extra pins. The internal RC oscillator, power-on reset, and brown-out detector mean a minimal working board needs only decoupling capacitors - ideal for first embedded design coursework.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA88A-MUR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA88PA-MUR | ATMEGA88A-MU | ATMEGA88-20MU | ATMEGA168A-MUR | ATMEGA48PA-MUR |
|---|---|---|---|---|---|---|
| Package | 32-VQFN (5x5 mm) | 32-VQFN (5x5 mm) - same | 32-VQFN (5x5 mm) - same | 32-VQFN (5x5 mm) - same | 32-VQFN (5x5 mm) - same | 32-VQFN (5x5 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory (Flash) | 8 KB | 8 KB | 8 KB | 8 KB | 16 KB | 4 KB |
| SRAM | 1 KB | 1 KB | 1 KB | 1 KB | 1 KB | 512 B |
| EEPROM | 512 B | 512 B | 512 B | 512 B | 512 B | 256 B |
| Maximum Clock Speed | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Supply Voltage Range | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 2.7 V to 5.5 V (per original die) | 1.8 V to 5.5 V | 1.8 V to 5.5 V |
| Power Optimization | picoPower-class (A revision) | picoPower (P die) - lowest current | picoPower-class (A revision) | original die, higher sleep current | picoPower-class (A revision) | picoPower (P die) |
| Packaging Format | Tape & Reel (R suffix) | Tape & Reel | Standard tray/tube qty | Standard tray/tube qty | Tape & Reel | Tape & Reel |
Key Differentiators
- picoPower sleep architecture (vs ATMEGA88-20MU)
- Upgrade path to double Flash without PCB change (vs ATMEGA168A-MUR)
- Cost reduction path for simpler firmware (vs ATMEGA48PA-MUR)
- Automated assembly packaging (vs ATMEGA88A-MU)
Design Notes
Clock frequency must derate with supply voltage: full 20MHz operation is only guaranteed at 4.5V to 5.5V per the ATmega88A datasheet frequency-versus-VCC curve. If your design runs at 3.3V, limit the system clock to the curve's safe region (roughly 10MHz class) or accept a fuse-verified lower clock. Enable the brown-out detector (BOD) via fuses so the MCU does not execute code corruptly during supply droop - critical in 5V appliance designs with slow-railing power supplies.
Connect AVCC (pin 18) to VCC through a low-pass RC network (typical 10 ohm / 100 nF) when ADC accuracy matters, and keep analog traces to ADC0-7 and AREF away from the SPI and USART switching lines. The exposed pad on the 32-VQFN should be soldered to a ground pour for mechanical reliability and thermal dissipation - it is the main ground return for the die. Place 100 nF decoupling capacitors at both VCC pins (4 and 6) within 2 mm of the pads.
PC6/RESET is used by debugWIRE for in-circuit debugging; do not connect external pull-up circuitry that fights the single-wire debug driver until firmware is stable. Reserve the 6-pin ICSP header (VCC, GND, RESET, SCK PB5, MOSI PB3, MISO PB4) on every production board, since field firmware updates require it. Also remember the A-revision fuse defaults: clock source fuses must be programmed before switching from the internal RC oscillator to external crystal, or the device may become unreachable.
At 20MHz and 5V with all 23 GPIOs driving capacitive loads, estimated dynamic current can approach the datasheet active-mode maximum, but the 32-VQFN exposed pad with a solid ground pour keeps junction rise minimal (well under 20C at typical 50 mA-class consumption, using estimated theta_JA values in still air). No heatsinking is required for normal operation; the main thermal consideration is solder-joint quality on the exposed pad, verified by X-ray for high-reliability assemblies.
Compliance Information
Distributor listings identify the package as Green (Microchip green designation, per FindIC listing: MLF/QFN, Ind Temp, Green, T&R). REACH and conflict minerals status not stated in provided data.
