ATMEGA88PB-AN - 8KB AVR MCU 20MHz TQFP-32 | Microchip
MPN: ATMEGA88PB-AN ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.52 | $0.52 |
| 10 | $0.48 | $4.80 |
| 100 | $0.44 | $44.00 |
| 500 | $0.41 | $205.00 |
| 1,000 | $0.38 | $380.00 |
ATMEGA88PB-AN Overview
An 8-bit microcontroller (MCU) is a single-chip processor that integrates a CPU core, program memory, data memory, and peripherals such as timers, UARTs, and ADCs on one die. Within the semiconductor hierarchy it belongs to the embedded processor family: microcontroller -> embedded MCU -> semiconductor integrated circuit. AVR is the classic Harvard-architecture RISC family originally developed by Atmel, now part of Microchip Technology, and the ATmega line is its mid-range tier between the ATtiny and the higher-memory ATmega328/644 series.
Key features include Microchip picoPower technology for sub-uA sleep currents, a USART with wake-up on start condition, three flexible timer/counters with compare modes, a 10-bit ADC with internal 1.1V/2.56V references, a byte-oriented two-wire interface (TWI/I2C), SPI, and an analog comparator. Functional Safety (FuSa) documentation support is available, and the device is rated to 105C ambient (Mouser: TQFP, 105C, GREEN).
The AVR core executes most instructions in a single clock cycle through a two-stage pipeline with 32 general-purpose working registers, giving deterministic timing valued in industrial control. Read-while-write Flash allows the self-programming bootloader to run while erasing or writing program memory.
Typical applications include industrial sensor nodes, consumer appliance controls, battery-powered meters, HVAC controls, and general embedded control boards where the ATmega88 family is a de-facto standard, including Arduino-compatible designs.
Design-wise, keep VCC and AVCC decoupled with 100 nF ceramics close to pins 4/6 and 18, and plan the pin 29 RESET pin for ISP programming via the 6-pin ICSP header supported by MPLAB SNAP or PICkit programmers.
This page synthesizes distributor pricing, same-brand drop-in alternatives, pinout data, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for ATMEGA88PB-AN — 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 ATMEGA88PB-AN (same form factor and footprint) — differing in Package, Flash Memory, RoHS Status, Operating Temperature, ADC.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATMEGA88PA-ANR
✅ Drop-In✓ In Stock
$0.92 / Unit
View Datasheet →ATMEGA88PA-AUR
✅ Drop-In✓ In Stock
$0.82 / Unit
View Datasheet →ATMEGA88A-AU
✅ Drop-In✓ In Stock
$1.52 / Unit
View Datasheet →ATMEGA88-20AU
✅ Drop-In✓ In Stock
$2.33 / Unit
View Datasheet →ATMEGA168PB-AU
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$1.27 / Unit
View Datasheet →ATMEGA88PB-AN Maximum Ratings & Electrical Characteristics
| Core | AVR 8-bit RISC |
| Core Size | 8-bit |
| Max Clock Frequency | 20 MHz |
| Flash Memory | 8 KB (4K x 16), ISP, read-while-write |
| EEPROM | 512 B |
| SRAM | 1 KB |
| I/O Lines | 27 |
| Working Registers | 32 general purpose |
| Timers/Counters | 3 (with compare modes) |
| Communication Interfaces | USART, SPI, TWI (I2C) |
| Package | 32-TQFP (7x7 mm), A suffix |
| Mounting Type | Surface Mount |
| Low Power Technology | picoPower |
| Functional Safety Support | Yes (FuSa) |
| Programming Interface | ICSP (ISP), supported by MPLAB SNAP |
| RoHS Status | GREEN (per Mouser listing) |
ATMEGA88PB-AN Pin Configuration
| Pin 1 | PD3 — Port D, bit 3 (GPIO / PCINT19) |
| Pin 2 | PD4 — Port D, bit 4 (GPIO / PCINT20 / XCK/T0) |
| Pin 3 | GND — Ground |
| Pin 4 | VCC — Digital supply voltage |
| Pin 5 | GND — Ground |
| Pin 6 | VCC — Digital supply voltage |
| Pin 7 | PB6 — Port B, bit 6 (GPIO / XTAL1 / TOSC1 / PCINT6) |
| Pin 8 | PB7 — Port B, bit 7 (GPIO / XTAL2 / TOSC2 / PCINT7) |
| Pin 9 | PD5 — Port D, bit 5 (GPIO / T1 / PCINT21) |
| Pin 10 | PD6 — Port D, bit 6 (GPIO / AIN0 / PCINT22) |
| Pin 11 | PD7 — Port D, bit 7 (GPIO / AIN1 / PCINT23) |
| Pin 12 | PB0 — Port B, bit 0 (GPIO / ICP1 / CLKO / PCINT8) |
| Pin 13 | PB1 — Port B, bit 1 (GPIO / OC1A / PCINT9) |
| Pin 14 | PB2 — Port B, bit 2 (GPIO / SS / OC1B / PCINT10) |
| Pin 15 | PB3 — Port B, bit 3 (GPIO / MOSI / OC2A / PCINT11) |
| Pin 16 | PB4 — Port B, bit 4 (GPIO / MISO / PCINT12) |
| Pin 17 | PB5 — Port B, bit 5 (GPIO / SCK / PCINT13) |
| 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 — Port C, bit 0 (GPIO / ADC0 / PCINT14) |
| Pin 24 | PC1 — Port C, bit 1 (GPIO / ADC1 / PCINT15) |
| Pin 25 | PC2 — Port C, bit 2 (GPIO / ADC2 / PCINT16) |
| Pin 26 | PC3 — Port C, bit 3 (GPIO / ADC3 / PCINT17) |
| Pin 27 | PC4 — Port C, bit 4 (GPIO / ADC4 / SDA / PCINT18) |
| Pin 28 | PC5 — Port C, bit 5 (GPIO / ADC5 / SCL / PCINT19) |
| Pin 29 | PC6 — RESET (active-low, also GPIO if RSTDISBL fused) |
| Pin 30 | PD0 — Port D, bit 0 (GPIO / RXD / PCINT16) |
| Pin 31 | PD1 — Port D, bit 1 (GPIO / TXD / PCINT17) |
| Pin 32 | PD2 — Port D, bit 2 (GPIO / INT0 / PCINT18) |
Typical Applications
ATMEGA88PB-AN is suitable for 6 applications: Industrial Sensor Nodes, Consumer Appliance Control, Battery-Powered Meters and Remote Sensors, Hobbyist and Arduino-Compatible Boards, HVAC and Building Automation, Automotive Auxiliary Non-Safety Electronics.
Industrial Sensor Nodes
The ATMEGA88PB-AN fits industrial sensor nodes because its 27 GPIO lines, 10-bit ADC, TWI and SPI interfaces connect analog sensors and digital buses directly, while picoPower sleep modes keep battery or energy-harvesting nodes alive for long service intervals. A typical node reads a sensor through I2C or SPI, applies local filtering with the 1 KB SRAM, and reports over USART RS-485 or a radio module, all scheduled by the three timer/counters. Operating to 105C suits control cabinets and outdoor enclosures, and Functional Safety (FuSa) support eases documentation for monitored industrial equipment.
Recommended
Consumer Appliance Control
Appliance front-boards - cooktop interfaces, fan controls, dispenser units - use the ATMEGA88PB-AN because the AVR core's single-cycle execution delivers deterministic button-scan and relay-timing loops at 20 MHz, while 8 KB Flash holds state machines, LED multiplexing, and UI logic comfortably. The internal 8 MHz RC oscillator and internal ADC references remove external components, cutting BOM cost on high-volume boards, and the 512 B EEPROM stores calibration and user settings through power cycles. GREEN, RoHS-compliant TQFP-32 construction supports lead-free mass-assembly lines typical of appliance contract manufacturers.
Recommended
Battery-Powered Meters and Remote Sensors
The ATMEGA88PB-AN serves battery-powered metering through picoPower technology: power-down sleep with watchdog wake-up keeps average current at uA levels, extending coin-cell or lithium primary life to years. The USART wake-on-start-of-transmission feature lets a radio or wired link wake the MCU only when data arrives, and pin-change interrupts wake on user interaction without polling. A typical design sleeps with only the RTC timer active, samples a metering input via the 10-bit ADC every few seconds, and transmits in bursts. The 1.8V floor allows full use of a discharging cell.
Recommended
Hobbyist and Arduino-Compatible Boards
The ATmega88 family is a de-facto standard in open-source embedded platforms, and the ATMEGA88PB-AN drops directly onto Arduino-compatible TQFP-32 layouts. Hobbyists program it over ICSP with an Arduino-as-ISP or MPLAB SNAP using the same SPI programming pins (MOSI/MISO/SCK/RESET) found on UNO-class boards, and existing ATmega88/328 bootloaders port with minor memory-size constants. The 27 GPIO and three timers support shields, robotics, and LED projects, while sub-$1 volume pricing makes class kits and workshop batches economical. Community toolchains (avr-gcc, Arduino IDE) fully support the PB generation.
Recommended
HVAC and Building Automation
Thermostats, damper controllers, and zone-control boards use the ATMEGA88PB-AN for its combination of a 10-bit ADC (for NTC temperature sensing and 0-10V feedback via dividers), timer/PWM outputs for triac or SSR drive, and TWI bus for display and expansion modules. The 105C ambient rating tolerates control-box environments near heating equipment, and the internal 1.1V/2.56V references enable ratiometric sensor measurement without external references. picoPower idle modes keep always-on thermostats within energy-standard budgets, while the EEPROM preserves setpoints and schedules across power outages without battery backup.
Recommended
Automotive Auxiliary Non-Safety Electronics
The ATMEGA88PB-AN appears in auxiliary vehicle electronics - lighting sequencers, gauge drivers, accessory controllers - where the wide supply tolerance, watchdog timer, and brown-out detector maintain robust operation with ignition transients, and the 105C rating covers cabin and engine-bay-adjacent enclosures. Its USART with wake-on-start suits LIN-style polled links when combined with a transceiver, and timer input-capture decodes variable-frequency sensors directly. FuSa (Functional Safety) support documentation assists tier suppliers integrating the device into monitored subsystems, though qualification-level requirements should always be verified against the specific OEM standard.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA88PB-AN — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA88PA-AN | ATMEGA88PA-AUR | ATMEGA88A-AU | ATMEGA88-20AU | ATMEGA168PB-AU |
|---|---|---|---|---|---|---|
| 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 | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 8 KB | 8 KB | 8 KB | 8 KB | 8 KB | 16 KB (2x) |
| Max Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| SRAM | 1 KB | 1 KB | 1 KB | 1 KB | 1 KB | 1 KB |
| EEPROM | 512 B | 512 B | 512 B | 512 B | 512 B | 512 B |
| Low Power Technology | picoPower (PB generation) | picoPower (PA generation) | picoPower (PA generation) | No picoPower | No picoPower | picoPower (PB generation) |
| Generation / Family | ATmega88PB (latest 88 generation) | ATmega88PA | ATmega88PA | ATmega88A | ATmega88 (original) | ATmega168PB |
Key Differentiators
- Latest ATmega88 generation with picoPower (vs ATMEGA88A-AU)
- Functional Safety (FuSa) documentation support (vs ATMEGA88-20AU)
- Direct memory upgrade path on the same footprint (vs ATMEGA168PB-AU)
Design Notes
Decouple VCC (pins 4/6) and AVCC (pin 18) with 100 nF X7R ceramics placed within 2 mm of each pin, plus one 4.7-10 uF bulk capacitor per supply rail. Tie AVCC to VCC through an LC filter (10 uH + 100 nF) when the ADC is used in noisy environments, and never leave AVCC unconnected even if the ADC is unused - the datasheet requires AVCC within 0.3 V of VCC. Connect pin 21 GND directly to a solid ground pour rather than a long trace.
Reserve the standard 6-pin ICSP header (MOSI PB3, MISO PB4, SCK PB5, RESET PC6, VCC, GND) on every production board even if field programming is not planned - in-circuit reprogramming via MPLAB SNAP or AVR ISP tools is the primary recovery path for firmware updates and bricked units. Keep the RESET trace short and add a 10 kOhm pull-up to VCC plus optional 100 nF to GND for noise immunity in electrically harsh environments, as spurious resets are the most common field failure mode.
When migrating between ATmega88 generations (88/88A/88PA/88PB), recompile firmware and review the device datasheet migration sections rather than reflashing the same binary: peripheral base registers are largely identical but feature bits and calibration bytes differ, and Microchip app note AVR094 ('Replacing ATmega8 by ATmega88') documents family migration methodology. Also note PB-generation picoPower sleep currents differ from PA - re-measure battery budget after substitution, and verify EEPROM retention code paths since EEPROM timing may vary slightly across generations.
Estimated: at 5 V and 20 MHz full-speed active operation, an ATmega88-class device draws roughly 5-6 mA, dissipating about 25-30 mW - negligible thermally for the TQFP-32 (theta JA around 100 C/W class, temperature rise under 3 C). The design constraint is sleep-mode average current, not power dissipation: budget uA-class power-down current plus watchdog wake-up duty cycle. Estimated: a node sleeping 99% of the time at 1 uA and active 1% at 5 mA averages about 51 uA, giving roughly 2 years on a 900 mAh cell.
Compliance Information
Mouser lists the device as 'TQFP, 105C, GREEN' - Microchip GREEN designation indicates RoHS-compliant, lead-free, halogen-free construction. REACH and conflict-minerals declarations not stated in provided data.
