ATMEGA169PA-MNR - 8-bit AVR MCU 16KB Flash 16MHz | Microchip
MPN: ATMEGA169PA-MNR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.93 | $5.93 |
| 10 | $5.34 | $53.40 |
| 100 | $4.45 | $445.00 |
| 500 | $3.56 | $1,780.00 |
| 1,000 | $1.8 | $1,800.00 |
ATMEGA169PA-MNR Overview
An 8-bit AVR microcontroller is a Harvard-architecture processor that executes most instructions in a single clock cycle. In the power-management hierarchy, it sits as a complete embedded system-on-chip: CPU, program memory (flash), data memory (SRAM and EEPROM), peripherals, and I/O integrated in one IC, positioned above bare logic ICs and below 32-bit application processors.
Key features include the advanced RISC architecture with 133 powerful instructions, in-system programmable (ISP) flash with read-while-write capability, and the picoPower technology family (PA suffix) that reduces active and sleep-mode current consumption versus the original ATmega169P. Supply voltage spans 2.7 V to 5.5 V, allowing operation from two-cell battery stacks or 5 V industrial rails.
The device integrates a 10-bit ADC with up to 8 single-ended channels, an analog comparator, a USI-compatible serial interface with SPI options, two 8-bit and one 16-bit timer/counters with PWM, and a programmable watchdog timer with on-chip oscillator. The JTAG-style boundary-scan and on-chip debug capability on ATmega169-class parts, together with In-Circuit Serial Programming (ICSP), shortens development cycles using tools such as the MPLAB SNAP programmer.
Typical applications include LCD-segment-driven appliances, battery-powered meters, industrial control panels, and consumer electronics where the 54 I/O lines and low picoPower sleep currents are decisive.
Design consideration: keep VCC within 2.7-5.5 V and decouple every supply pad of the 64-QFN with 100 nF ceramics placed directly under the exposed ground paddle.
This page synthesizes distributor pricing, same-package alternatives, and pinout guidance not found in a single manufacturer page.
Drop-in alternatives for ATMEGA169PA-MNR — 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 ATMEGA169PA-MNR (same form factor and footprint) — differing in Instruction Set, Supply Voltage Range, Core Processor, Package, Packaging.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATMEGA169PA-MN
✅ Drop-In✓ In Stock
$3.05 / Unit
View Datasheet →ATMEGA165PA-MNR
✅ Drop-In✓ In Stock
Contact for price
View Datasheet →ATMEGA649P-MU
✅ Drop-In📋 Reference alternative (not in catalog)
ATMEGA329PA-MU
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$5.18 / Unit
View Datasheet →ATMEGA325PA-MU
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
ATMEGA169PA-MNR Maximum Ratings & Electrical Characteristics
| Core Processor | AVR ATmega, 8-bit RISC |
| Core Size | 8-Bit |
| Max Clock Frequency | 16 MHz |
| Flash Memory Size | 16 KB (8K x 16) |
| EEPROM Size | 512 B |
| SRAM Size | 1 KB |
| Supply Voltage Range | 2.7 V to 5.5 V |
| General Purpose I/O | 54 I/O lines |
| Instruction Set | 133 powerful instructions, mostly single-cycle |
| Package | 64-QFN (MLF), 9 x 9 mm |
| Mounting Type | Surface Mount |
| Programming Interface | ISP / ICSP |
| Technology | picoPower low-power AVR |
| Timers | 2 x 8-bit, 1 x 16-bit with PWM |
| Data Bus Width | 8 Bit |
| Lifecycle Stage | Active |
| Packaging | Tape and Reel (MNR) |
ATMEGA169PA-MNR Pin Configuration
| Pin 1 | PB0 — Port B, general purpose I/O |
| Pin 2 | PB1 — Port B, general purpose I/O |
| Pin 3 | PB2 — Port B, general purpose I/O |
| Pin 4 | PB3 — Port B, general purpose I/O |
| Pin 5 | PB4 — Port B, general purpose I/O |
| Pin 6 | PB5 — Port B, general purpose I/O |
| Pin 7 | PB6 — Port B, general purpose I/O |
| Pin 8 | PB7 — Port B, general purpose I/O |
| Pin 9 | VCC — Digital supply voltage |
| Pin 10 | GND — Ground |
| Pin 11 | PC0 — Port C, general purpose I/O |
| Pin 12 | PC1 — Port C, general purpose I/O |
| Pin 13 | PC2 — Port C, general purpose I/O |
| Pin 14 | PC3 — Port C, general purpose I/O |
| Pin 15 | PC4 — Port C, general purpose I/O |
| Pin 16 | PC5 — Port C, general purpose I/O |
| Pin 17 | PC6 — Port C, general purpose I/O |
| Pin 18 | PC7 — Port C, general purpose I/O |
| Pin 19 | PD0 — Port D, general purpose I/O |
| Pin 20 | PD1 — Port D, general purpose I/O |
| Pin 21 | PD2 — Port D, general purpose I/O |
| Pin 22 | PD3 — Port D, general purpose I/O |
| Pin 23 | PD4 — Port D, general purpose I/O |
| Pin 24 | PD5 — Port D, general purpose I/O |
| Pin 25 | PD6 — Port D, general purpose I/O |
| Pin 26 | PD7 — Port D, general purpose I/O |
| Pin 27 | VCC — Digital supply voltage |
| Pin 28 | GND — Ground |
| Pin 29 | PE0 — Port E, general purpose I/O |
| Pin 30 | PE1 — Port E, general purpose I/O |
| Pin 31 | PE2 — Port E, general purpose I/O |
| Pin 32 | PE3 — Port E, general purpose I/O |
| Pin 33 | PE4 — Port E, general purpose I/O |
| Pin 34 | PE5 — Port E, general purpose I/O |
| Pin 35 | PE6 — Port E, general purpose I/O |
| Pin 36 | PE7 — Port E, general purpose I/O |
| Pin 37 | PF0 — Port F / ADC input |
| Pin 38 | PF1 — Port F / ADC input |
| Pin 39 | PF2 — Port F / ADC input |
| Pin 40 | PF3 — Port F / ADC input |
| Pin 41 | PF4 — Port F / ADC input |
| Pin 42 | PF5 — Port F / ADC input |
| Pin 43 | PF6 — Port F / ADC input |
| Pin 44 | PF7 — Port F / ADC input |
| Pin 45 | AVCC — Analog supply voltage for ADC |
| Pin 46 | GND — Ground |
| Pin 47 | AREF — Analog reference for ADC |
| Pin 48 | RESET — Reset input / ICSP programming line |
| Pin 49 | PG0 — Port G, general purpose I/O |
| Pin 50 | PG1 — Port G, general purpose I/O |
| Pin 51 | PG2 — Port G, general purpose I/O |
| Pin 52 | PG3 — Port G, general purpose I/O |
| Pin 53 | PG4 — Port G, general purpose I/O |
| Pin 54 | PG5 — Port G, general purpose I/O |
| Pin 55 | PA0 — Port A / ADC input |
| Pin 56 | PA1 — Port A / ADC input |
| Pin 57 | PA2 — Port A / ADC input |
| Pin 58 | PA3 — Port A / ADC input |
| Pin 59 | PA4 — Port A / ADC input |
| Pin 60 | PA5 — Port A / ADC input |
| Pin 61 | PA6 — Port A / ADC input |
| Pin 62 | PA7 — Port A / ADC input |
| Pin 63 | XTAL1 — Clock oscillator input |
| Pin 64 | XTAL2 — Clock oscillator output |
Typical Applications
ATMEGA169PA-MNR is suitable for 6 applications: Segment-LCD Appliances and Metering Displays, Battery-Powered Portable Instruments, Industrial Control Panels and Automation Nodes, Consumer Electronics and White-Goods Controls, Sensor Hubs and Data Acquisition Front-Ends, RF Module and Remote Control Boards.
Segment-LCD Appliances and Metering Displays
The ATMEGA169PA-MNR fits segment-driven appliance and metering front-ends because its 54 GPIO lines and ATmega169-class peripheral set drive multi-segment glass displays directly while the picoPower core keeps standby current low. In a typical energy meter or cooker-control panel, the MCU runs at 1-8 MHz from a 3-5 V rail, multiplexes display segments through port lines, and sleeps between measurement cycles, extending battery life in unpowered-meter scenarios. The 16 KB flash stores lookup tables and localization strings, the 512 B EEPROM holds calibration constants across power cycles, and the 10-bit ADC feeds mains-sensing front-ends. Unlike a discrete LCD driver plus separate MCU, this integration cuts board area and BOM count; the trade-off is segment-count headroom, which should be verified against port capacity before finalizing the glass design.
Recommended
Battery-Powered Portable Instruments
For handheld meters, detectors, and loggers, the ATMEGA169PA-MNR combines picoPower sleep modes with a 2.7 V to 5.5 V supply window, allowing direct operation from two-cell alkaline or single-cell lithium stacks near end-of-discharge. The 10-bit ADC samples sensor bridges or dividers, the 16-bit timer with PWM controls buzzers or backlight, and 54 I/O lines handle keypads, status LEDs, and peripheral enables simultaneously - usually enough to avoid port expanders. Designers typically clock at 1-8 MHz from internal RC at low VCC and wake on pin-change interrupts, achieving multi-month runtimes; the EEPROM preserves user calibration in the field. Compared with the ATMEGA165PA-MNR, this part suits products whose roadmap includes display-based variants, keeping one firmware platform and one PCB footprint across the family.
Recommended
Industrial Control Panels and Automation Nodes
On 5 V industrial panels, the ATMEGA169PA-MNR's wide 2.7-5.5 V tolerance, watchdog timer with on-chip oscillator, and 54 GPIO make it a robust node controller for button/status-light clusters, relay logic, and sensor polling. The mostly single-cycle 133-instruction RISC core delivers deterministic timing at 16 MHz for scanning and debounce loops, while in-system programmable (ISP) flash with read-while-write permits field firmware updates over the ICSP interface using an MPLAB SNAP programmer - valuable for installed equipment. The 1 KB SRAM holds state machines and Modus-style ASCII buffers for short messages. Because the part ships on tape and reel (MNR), contract manufacturers can run automated pick-and-place at volume; the 64-pad MLF paddle must be soldered to a grounded pour for mechanical robustness in vibrating cabinets.
Recommended
Consumer Electronics and White-Goods Controls
Consumer appliance control boards benefit from the ATMEGA169PA-MNR's balance of cost, I/O count, and flash size. A washing-machine or coffee-maker controller typically uses port pins for touch keys, triac/relay drives, and seven-segment indicators, while the 16 KB flash accommodates wash-curve state machines and fault diagnostics, and the 512 B EEPROM stores cycle counters and last-used settings through power loss. The picoPower generation trims standby draw, supporting standby energy limits in modern regulations. Availability through broadline distributors (DigiKey, LCSC, Mouser) at around $1.80 per unit at 1000 pieces as of 2026-09-16 simplifies BOM planning for high-volume consumer programs. Engineering teams should lock the bootloader and fuse settings early, since the same 64-QFN footprint hosts larger-memory siblings for future feature uplifts without respin.
Recommended
Sensor Hubs and Data Acquisition Front-Ends
As a compact DAQ front-end, the ATMEGA169PA-MNR pairs its 10-bit ADC and analog comparator with the 16-bit timer to timestamp and digitize slow signals such as temperatures, pressures, and liquid levels. The 54 I/O lines drive channel-select muxes, relay multiplexers, and host handshaking, while SPI via the serial interface streams samples upstream. The 1 KB SRAM supports burst capture of hundreds of 10-bit readings, and read-while-write flash lets calibration tables update during operation. Running the ADC from AVCC with a clean reference and the 64-QFN paddle grounded through a solid pour preserves low-noise conversion accuracy. For deployments needing more resolution, capture depth, or channels, the pin-compatible ATMEGA329PA-MU and ATMEGA649P-MU provide migration without PCB changes - a key supply-chain and design-reuse advantage.
Recommended
RF Module and Remote Control Boards
In sub-GHz and 2.4 GHz remote controls and module hosts, the ATMEGA169PA-MNR acts as the protocol MCU: its single-cycle RISC core generates precise bit timing via the 16-bit timer, port pins sequence PA/LNA enable lines, and picoPower sleep modes stretch coin-cell or AA-battery life between keypress wakes. The 64-pad QFN keeps the controller footprint small behind an RF module, and 54 I/O leaves headroom for LEDs, battery monitors on the ADC, and roll-code EEPROM storage in the 512 B EEPROM. Design notes: keep XTAL1/XTAL2 and the ICSP/RESET traces short and away from the antenna feed to avoid coupling reset glitches during RF bursts, and decouple each VCC pad with 100 nF ceramic capacitors placed directly beneath the package paddle region for clean supply behavior during transmit current spikes.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA169PA-MNR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA169PA-MN | ATMEGA165PA-MNR | ATMEGA649P-MU | ATMEGA329PA-MU |
|---|---|---|---|---|---|
| Package | 64-QFN (MLF) 9x9 mm | 64-QFN (MLF) 9x9 mm - same | 64-QFN (MLF) 9x9 mm - same | 64-QFN (MLF) 9x9 mm - same | 64-QFN (MLF) 9x9 mm - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 16 KB | 16 KB | 16 KB | 64 KB | 32 KB |
| Max Clock Frequency | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 16 MHz |
| Supply Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V |
| SRAM | 1 KB | 1 KB | 1 KB | 4 KB | 2 KB |
| EEPROM | 512 B | 512 B | 512 B | 4 KB | 1 KB |
| Packaging Format | Tape and Reel (MNR) | Tray (MN) | Tape and Reel | Tape and Reel | Tape and Reel |
| Firmware Compatibility | Baseline (ATmega169 code base) | Identical - no changes | Recompile, peripheral remap | Recompile, memory map changes | Recompile, minor remap |
Key Differentiators
- Highest I/O density in the low-cost picoPower family here (vs ATMEGA168PA-MU)
- Flash upgrade headroom without respin (vs ATMEGA649P-MU)
- Tape-and-reel supply for automated assembly (vs ATMEGA169PA-MN)
- picoPower generation efficiency (vs ATMEGA165PA-MNR)
Design Notes
The 64-QFN (MLF) package has an exposed center paddle that must be soldered to a grounded pour - it serves as both the primary ground return and mechanical anchor. Use a 3x3 or 4x4 via array under the paddle to stitch to internal ground planes. Place 100 nF ceramic decoupling capacitors on each VCC/AVCC pad pair as close to the package edge as possible, and connect AVCC to VCC through an LC filter (ferrite bead plus 100 nF) when ADC accuracy matters.
Keep supply within the 2.7-5.5 V range and check the voltage-versus-maximum-frequency derating curve in the manufacturer datasheet before clocking at 16 MHz near 2.7 V. Brown-out detection should be enabled via fuses for battery applications so the MCU halts cleanly rather than corrupting EEPROM writes as the cell decays toward 2.7 V. Estimated: at 5 V and modest I/O loading, AVR ATmega active current at 16 MHz is typically in the tens of mA range - size the regulator with margin above quiescent plus worst-case I/O sink/source current.
RESET doubles as the ICSP programming line: do not load it with large capacitance or strong pull-downs, or the MPLAB SNAP programmer will fail to enter programming mode. Keep the RESET trace short with a 10 k pull-up. When substituting ATMEGA649P-MU or ATMEGA329PA-MU on this footprint, re-verify fuse defaults and register maps - they are pin-compatible but not register-identical, and shipping unverified firmware is the most common post-swap failure mode.
Route XTAL1/XTAL2 as short, guarded traces with the crystal ground guards returned directly to the nearest GND pad; keep RF or switching traces at least 3x the crystal trace width away from them. For ADC channels on ports A and F, avoid running digital PWM return currents under the analog traces - a moat around the AREF/AVCC region preserves the 10-bit converter's effective resolution in mixed-signal layouts.
Compliance Information
Verified web data classifies the part as Active and 'Green' packaging per FindIC, but explicit RoHS/REACH declarations were not present in the retrieved data - obtain certificates from Microchip's compliance portal before regulatory submission.
