ATMEGA32-16PU - 8-bit AVR MCU 16MHz 32KB Flash | Microchip
MPN: ATMEGA32-16PU β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.92 | $5.92 |
| 10 | $5.32 | $53.20 |
| 100 | $4.65 | $465.00 |
| 500 | $4.12 | $2,060.00 |
| 1,000 | $3.68 | $3,680.00 |
ATMEGA32-16PU Overview
An 8-bit AVR microcontroller is a single-chip computer built around the AVR advanced RISC architecture, in which a rich register file of 32 general purpose working registers is directly connected to the ALU so most instructions execute in a single clock cycle. Within the product hierarchy, it sits as an embedded MCU inside the broader families of microcontrollers, integrated circuits, and semiconductors, providing computation, memory, and peripherals in one package.
Key features include 131 powerful instructions with mostly single-cycle execution, an 8-channel 10-bit ADC for analog sensing, a JTAG interface for on-chip debugging and boundary-scan, and read-while-write ISP FLASH that allows firmware updates in the field without removing the chip. Four flexible timer/counters with PWM outputs, a USART for serial communication, an SPI interface, and a two-wire (I2C-compatible) interface round out the peripheral set.
Architecturally, the Harvard-structured AVR core fetches instructions and data over separate buses, achieving one MIPS per MHz of clock. The 32KB FLASH is organized as 16K x 16 bits and rated for in-system reprogramming, while lock bits protect the codebase. An on-chip RC oscillator allows clockless-board designs, or an external crystal up to 16 MHz can be used for maximum throughput.
Typical applications include university and vocational training labs, breadboard prototyping, industrial control panels, and legacy 5V embedded systems where through-hole mounting simplifies assembly and repair. The 4.5V to 5.5V supply range makes it a natural fit for 5V logic environments.
For design, remember that the PDIP package has higher thermal resistance than TQFP variants, and the ADC reference should use AVCC with proper filtering for accurate conversions. The device is socket-friendly, so field firmware updates via ISP are trivial.
This page adds value beyond the datasheet by synthesizing distributor pricing tiers, drop-in replacement options such as ATMEGA32A-PU, and practical design notes for prototyping and production planning.
Drop-in alternatives for ATMEGA32-16PU 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 ATMEGA32-16PU (same form factor and footprint) β differing in Operating Temperature, Debug Interface, Package, ADC, Instructions.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
ATMEGA32A-PU
β Drop-Inπ Reference alternative (not in catalog)
ATMEGA32-16PI
β Drop-In β οΈ εζ°εΎ ιͺθ―β In Stock
$2.75 / Unit
View Datasheet βATMEGA16-16PU
β Drop-In β οΈ εζ°εΎ ιͺθ―β In Stock
$3.88 / Unit
View Datasheet βATMEGA8535-16PU
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATMEGA324P-20PU
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATMEGA32-16PU Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit AVR RISC |
| Maximum Clock Frequency | 16 MHz |
| Flash Memory | 32KB (16K x 16) |
| EEPROM | 1KB |
| SRAM | 2KB |
| General Purpose I/O | 32 lines |
| Supply Voltage Range | 4.5 V to 5.5 V |
| Throughput | 16 MIPS at 16 MHz |
| Instructions | 131 instructions, most single-cycle |
| ADC | 8-channel 10-bit |
| Debug Interface | JTAG (on-chip debug and boundary-scan) |
| Programming Interface | ISP (In-System Programmable), read-while-write |
| Package | 40-PDIP |
| Mounting Type | Through Hole |
| Operating Temperature | 0C to +70C (commercial grade) |
| Product Family | AVR ATmega |
ATMEGA32-16PU Pin Configuration
| Pin 1 | PB0 (XCK/T0) β Port B bit 0 / USART external clock / Timer0 external clock |
| Pin 2 | PB1 (T1) β Port B bit 1 / Timer1 external clock |
| Pin 3 | PB2 (AIN0/INT2) β Port B bit 2 / analog comparator positive input / external interrupt 2 |
| Pin 4 | PB3 (AIN0/OC0) β Port B bit 3 / analog comparator negative input / Timer0 PWM output |
| Pin 5 | PB4 (SS) β Port B bit 4 / SPI slave select |
| Pin 6 | PB5 (MOSI) β Port B bit 5 / SPI master output |
| Pin 7 | PB6 (MISO) β Port B bit 6 / SPI master input |
| Pin 8 | PB7 (SCK) β Port B bit 7 / SPI serial clock |
| Pin 9 | RESET β Active-low reset input |
| Pin 10 | VCC β Digital supply voltage (4.5V to 5.5V) |
| Pin 11 | GND β Ground |
| Pin 12 | XTAL2 β Inverting oscillator amplifier output |
| Pin 13 | XTAL1 β Inverting oscillator amplifier input / external clock input |
| Pin 14 | PD0 (RXD) β Port D bit 0 / USART receive |
| Pin 15 | PD1 (TXD) β Port D bit 1 / USART transmit |
| Pin 16 | PD2 (INT0) β Port D bit 2 / external interrupt 0 |
| Pin 17 | PD3 (INT1) β Port D bit 3 / external interrupt 1 |
| Pin 18 | PD4 (OC1B) β Port D bit 4 / Timer1 output compare B / PWM |
| Pin 19 | PD5 (OC1A) β Port D bit 5 / Timer1 output compare A / PWM |
| Pin 20 | PD6 (ICP1) β Port D bit 6 / Timer1 input capture |
| Pin 21 | PD7 (OC2) β Port D bit 7 / Timer2 output compare / PWM |
| Pin 22 | PC0 (SCL) β Port C bit 0 / two-wire serial clock |
| Pin 23 | PC1 (SDA) β Port C bit 1 / two-wire serial data |
| Pin 24 | PC2 (TCK) β Port C bit 2 / JTAG test clock |
| Pin 25 | PC3 (TMS) β Port C bit 3 / JTAG test mode select |
| Pin 26 | PC4 (TDO) β Port C bit 4 / JTAG test data output |
| Pin 27 | PC5 (TDI) β Port C bit 5 / JTAG test data input |
| Pin 28 | PC6 (TOSC1) β Port C bit 6 / Timer2 oscillator input |
| Pin 29 | PC7 (TOSC2) β Port C bit 7 / Timer2 oscillator output |
| Pin 30 | AVCC β ADC supply voltage |
| Pin 31 | GND β Ground |
| Pin 32 | AREF β ADC reference voltage |
| Pin 33 | PA7 (ADC7) β Port A bit 7 / ADC channel 7 |
| Pin 34 | PA6 (ADC6) β Port A bit 6 / ADC channel 6 |
| Pin 35 | PA5 (ADC5) β Port A bit 5 / ADC channel 5 |
| Pin 36 | PA4 (ADC4) β Port A bit 4 / ADC channel 4 |
| Pin 37 | PA3 (ADC3) β Port A bit 3 / ADC channel 3 |
| Pin 38 | PA2 (ADC2) β Port A bit 2 / ADC channel 2 |
| Pin 39 | PA1 (ADC1) β Port A bit 1 / ADC channel 1 |
| Pin 40 | PA0 (ADC0) β Port A bit 0 / ADC channel 0 |
Typical Applications
ATMEGA32-16PU is suitable for 6 applications: Education and University Labs, Breadboard Prototyping, Industrial Control Panels, Legacy 5V Embedded System Maintenance, Sensor Measurement Front Ends, Hobby and Maker Projects.
Education and University Labs
The ATMEGA32-16PU is a mainstay of electronics education because its 40-pin PDIP package plugs into cheap ZIF sockets and breadboards, and its 5V operation matches legacy lab bench supplies. With 32KB FLASH and the MightyCore Arduino support package, students can flash programs over ISP in seconds and debug via JTAG. The 32 GPIO lines across four ports allow LED matrices, keypads, and motor labs on a single chip. Unlike QFP MCUs, a damaged DIP part is replaced in under a minute, minimizing lab downtime and cost - a decisive advantage where hundreds of students handle hardware weekly.
Recommended
Breadboard Prototyping
For rapid prototyping, the ATMEGA32-16PU's 0.1-inch DIP-40 pin pitch connects directly to solderless breadboards without adapter boards. The 4.5V to 5.5V supply range accepts common USB-derived 5V rails, and the internal RC oscillator lets the chip run without an external crystal for quick tests. Its 8-channel 10-bit ADC reads sensors directly, while USART and SPI interfaces link to modules and displays. Engineers can iterate firmware over ISP in-circuit, and the generous 32KB FLASH accommodates trial code plus a serial bootloader simultaneously, eliminating chip swapping during development cycles.
Recommended
Industrial Control Panels
In industrial 5V and 24V environments, the ATMEGA32-16PU drives relay outputs, reads pushbuttons, and communicates over RS-485 via its USART. The 16 MIPS throughput handles real-time loop control, and the 10-bit ADC monitors potentiometers and analog transducers. Through-hole DIP mounting withstands vibration better than fine-pitch SMD in some panel designs and permits field replacement by technicians without hot-air rework. For deployments facing wider ambient temperatures, the pin-identical ATMEGA32-16PI industrial-grade variant covers -40C to +85C with no PCB or firmware changes required.
Recommended
Legacy 5V Embedded System Maintenance
Many installed systems - HVAC controllers, vending machines, instrumentation - were designed around 5V logic where the ATmega32 was the standard choice. The ATMEGA32-16PU keeps these systems serviceable: it is socket-compatible with original PCBs, runs unmodified firmware, and remains actively manufactured. When original stock runs out, the ATMEGA32A-PU drops into the same socket with zero design changes. Its read-while-write FLASH allows firmware bug fixes through a field bootloader, extending product life without recalls. This continuity is why the part still ships today from major distributors.
Recommended
Sensor Measurement Front Ends
The integrated 8-channel 10-bit ADC makes the ATMEGA32-16PU a compact measurement controller: up to eight analog inputs are sampled under firmware control with AVCC or an external AREF reference. A 10-bit conversion resolves roughly 4.9 mV per step at a 5V reference - adequate for NTC thermistors, potentiometers, and light sensors. Timer-triggered conversions with interrupts enable regular sampling intervals, while the 2KB SRAM buffers measurement records. Digitized results stream out via USART or SPI to a PC or display, making the chip a one-IC datalogger front end for education and instrumentation.
Recommended
Hobby and Maker Projects
Makers favor the ATMEGA32-16PU for stand-alone Arduino-class projects: 32 GPIO lines drive large LED matrices, stepper motors via driver ICs, and character LCDs, while hardware PWM channels generate servo and tone outputs without CPU load. The DIP-40 body is easy to hand-solder and reusable across projects in a ZIF socket programmer. Community resources - MightyCore, AVR-GCC toolchains, and countless tutorials - shorten the learning curve. At hobbyist quantities the single-unit price near 6 USD undercuts many newer SMD MCUs once adapter boards and 3.3V level shifters are counted.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA32-16PU β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA32A-PU | ATMEGA32-16PI | ATMEGA16-16PU | ATMEGA8535-16PU | ATMEGA324P-20PU |
|---|---|---|---|---|---|---|
| Package | 40-PDIP | 40-PDIP - same | 40-PDIP - same | 40-PDIP - same | 40-PDIP - same | 40-PDIP - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 32KB (16K x 16) | 32KB | 32KB | 16KB | 8KB | 32KB |
| Maximum Clock Frequency | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 20 MHz |
| Supply Voltage | 4.5V to 5.5V | 4.5V to 5.5V | 4.5V to 5.5V | 4.5V to 5.5V | 4.5V to 5.5V | 4.5V to 5.5V |
| SRAM | 2KB | 2KB | 2KB | 1KB | 512B | 2KB |
| Operating Temperature | 0C to +70C (commercial) | 0C to +70C | -40C to +85C (industrial) | 0C to +70C | 0C to +70C | -40C to +85C |
| Firmware Compatibility | Baseline (ATmega32) | 100% - same die generation | 100% - same die | Recompile - 16KB limit | Recompile - 8KB limit | Recompile - register differences |
Key Differentiators
- Largest FLASH in the classic DIP-40 AVR line (vs ATMEGA16-16PU)
- Newer-generation successor available (vs ATMEGA32A-PU)
- Commercial-grade pricing vs industrial grade (vs ATMEGA32-16PI)
Design Notes
Decouple VCC and AVCC separately with 100nF ceramic capacitors placed within 5mm of each pin, plus 10uF bulk capacitance on the board. AVCC must be connected to VCC even if the ADC is unused. Estimated: at 5V and 16 MHz with all peripherals active, current draw is in the tens of mA range per the datasheet DC characteristics, so a 100mA-class regulator is sufficient for the MCU alone.
In the DIP-40 package, keep the crystal within 10mm of XTAL1/XTAL2 with direct ground returns for the 22pF load capacitors. Route the ADC analog ground as a star connection back to pin 31 (GND) separate from digital return currents, and filter AVCC through an LC network (10uH + 100nF) when ADC accuracy matters. AREF needs a 100nF capacitor to ground for stable conversions.
JTAG is enabled at factory on PC2-PC7, removing four port pins from general I/O use - disable JTAG via the JTD bit in MCUCSR (write twice per datasheet) or clear the JTAGEN fuse if all 32 I/O lines are needed. Also, RESET shares a pin with the ISP programmer: avoid strong external pull-ups other than the recommended 10k, and never drive PC5/PC6 (TOSC pins) if the asynchronous Timer2 is enabled.
Compliance Information
Compliance data not present in the provided web sources; verify RoHS/lead-free status on the Microchip product page for the exact orderable part number.
