ATMEGA48PB-ANR - 8-Bit AVR 20MHz 4KB MCU | Microchip
MPN: ATMEGA48PB-ANR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.42 | $1.42 |
| 10 | $1.28 | $12.80 |
| 100 | $1.14 | $114.00 |
| 500 | $1.02 | $510.00 |
| 1,000 | $0.94 | $940.00 |
| 3,000 | $0.86 | $2,580.00 |
ATMEGA48PB-ANR Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (Flash), data memory (SRAM), non-volatile data storage (EEPROM), and peripherals such as timers, serial interfaces, and analog comparators. Within the semiconductor taxonomy, the ATmega48PB sits at microcontroller -> embedded processor -> integrated circuit -> semiconductor, and it belongs to the AVR family of RISC cores that execute most instructions in a single clock cycle. The picoPower architecture reduces active and sleep current, making the device suitable for battery-powered and energy-harvesting designs.
Key features include 4 KB ISP Flash with read-while-write capability, 256 B EEPROM for parameter storage, 512 B SRAM, 27 GPIO lines, three flexible timer/counters with compare modes, a USART with wake-up on start of transmission, an SPI and TWI (I2C) interface, a 10-bit ADC, and an internal calibrated RC oscillator. The device operates from 1.8 V to 5.5 V and is rated for the industrial temperature range up to 105 C, as indicated by the Mouser listing "20 MHZ, TQFP, 105C, GREEN T&R".
The ATmega48PB uses Microchip's AVR 8-bit RISC core with 32 general-purpose working registers and a two-stage pipeline, achieving up to 20 MIPS at 20 MHz. The picoPower technology combines a low-leakage process with flexible clock gating and multiple sleep modes, allowing designers to trade throughput for current consumption. The PB series adds an improved USART, an enhanced analog comparator, a factory-programmed serial number, and Functional Safety (FuSa) documentation support.
Typical applications include industrial control and sensor nodes, consumer appliance control panels, battery-powered IoT endpoints, motor control front-ends, lighting controllers, and automotive body electronics. The 32-pin TQFP footprint and 27 I/O lines give enough peripheral headroom for designs that need multiple timers, PWM channels, and serial interfaces simultaneously.
When designing with the ATMEGA48PB-ANR, note that migrating from the older ATmega48PA/88PA/168PA requires attention to modified pin functionality: per Microchip application note 00002605A, pin 3 must not be actively driven if connected to GND and ACO is enabled, and pin 6 must not be actively driven if connected to VCC. Decouple VCC with a 100 nF ceramic capacitor close to the pin and use a 10 uF bulk capacitor on the board rail.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, including migration conditions from the PA series and package-compatible sibling devices in the ATmega48PB/88PB/168PB family.
Drop-in alternatives for ATMEGA48PB-ANR — 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 ATMEGA48PB-ANR (same form factor and footprint) — differing in Serial Interfaces, EEPROM, Packaging, SRAM, Package.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATMEGA48PB-AN
✅ Drop-In✓ In Stock
$0.42 / Unit
View Datasheet →ATMEGA48PA-AU
✅ Drop-In✓ In Stock
$1.38 / Unit
View Datasheet →ATMEGA48PA-AN
✅ Drop-In✓ In Stock
$0.83 / Unit
View Datasheet →ATMEGA88PB-ANR
✅ Drop-In✓ In Stock
$1.38 / Unit
View Datasheet →ATMEGA168PB-ANR
✅ Drop-In✓ In Stock
$0.72 / Unit
View Datasheet →ATMEGA48PB-ANR Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit AVR RISC |
| Program Memory Size | 4 KB (2K x 16) ISP Flash |
| EEPROM Size | 256 B |
| SRAM Size | 512 B |
| Maximum Clock Frequency | 20 MHz |
| General Purpose I/O Lines | 27 |
| General Purpose Working Registers | 32 |
| Operating Voltage Range | 1.8 V to 5.5 V |
| Operating Temperature Range | -40 C to +105 C |
| Package | 32-pin TQFP (7x7 mm) |
| Mounting Type | Surface Mount |
| Timer/Counters | 3 flexible timer/counters with compare modes |
| Serial Interfaces | USART, SPI, TWI (I2C) |
| ADC | 10-bit successive approximation ADC |
| Analog Comparator | Yes (enhanced, with ACO) |
| Internal Oscillator | Calibrated internal RC oscillator |
| Power Technology | picoPower low-power technology |
| Packaging | Tape & Reel (T&R) |
| RoHS Status | Compliant (GREEN) |
ATMEGA48PB-ANR Pin Configuration
| Pin 1 | PD3 — Port D, bit 3 (also INT1/TXD alternate) |
| Pin 2 | PD4 — Port D, bit 4 (also XCK/T0 alternate) |
| Pin 3 | GND — Ground (must not be actively driven if ACO enabled per migration note) |
| Pin 4 | VCC — Digital supply voltage |
| Pin 5 | GND — Ground |
| Pin 6 | VCC — Digital supply voltage (must not be actively driven per migration note) |
| Pin 7 | PB0 — Port B, bit 0 (also ICP1/CLKO alternate) |
| Pin 8 | PB1 — Port B, bit 1 (also OC1A alternate) |
| Pin 9 | PB2 — Port B, bit 2 (also SS/OC1B alternate) |
| Pin 10 | PB3 — Port B, bit 3 (also MOSI/OC2A alternate) |
| Pin 11 | PB4 — Port B, bit 4 (also MISO alternate) |
| Pin 12 | PB5 — Port B, bit 5 (also SCK alternate) |
| Pin 13 | PB6 — Port B, bit 6 (also XTAL1/TOSC1 alternate) |
| Pin 14 | PB7 — Port B, bit 7 (also XTAL2/TOSC2 alternate) |
| Pin 15 | PD5 — Port D, bit 5 (also T1 alternate) |
| Pin 16 | PD6 — Port D, bit 6 (also AIN0 alternate) |
| Pin 17 | PD7 — Port D, bit 7 (also AIN1 alternate) |
| Pin 18 | PC0 — Port C, bit 0 (also ADC0 alternate) |
| Pin 19 | PC1 — Port C, bit 1 (also ADC1 alternate) |
| Pin 20 | PC2 — Port C, bit 2 (also ADC2 alternate) |
| Pin 21 | PC3 — Port C, bit 3 (also ADC3 alternate) |
| Pin 22 | PC4 — Port C, bit 4 (also ADC4 alternate) |
| Pin 23 | PC5 — Port C, bit 5 (also ADC5 alternate) |
| Pin 24 | PC6 — Port C, bit 6 (also RESET alternate) |
| Pin 25 | PD0 — Port D, bit 0 (also RXD alternate) |
| Pin 26 | PD1 — Port D, bit 1 (also TXD alternate) |
| Pin 27 | PD2 — Port D, bit 2 (also INT0 alternate) |
| Pin 28 | PD3 — Port D, bit 3 (also INT1 alternate) |
| Pin 29 | AVCC — Analog supply voltage for ADC |
| Pin 30 | AREF — Analog reference voltage for ADC |
| Pin 31 | GND — Ground |
| Pin 32 | PD4 — Port D, bit 4 (also XCK/T0 alternate) |
Typical Applications
ATMEGA48PB-ANR is suitable for 6 applications: Industrial Sensor Nodes, Battery-Powered IoT Endpoints, Consumer Appliance Control Panels, Motor Control Front-Ends, Lighting and LED Controllers, Automotive Body Electronics.
Industrial Sensor Nodes
The ATMEGA48PB-ANR fits industrial sensor nodes because its 27 GPIO lines, 10-bit ADC, and three timer/counters can service multiple analog and digital sensors simultaneously while the 20 MHz AVR core executes control loops in single clock cycles. The 1.8 V to 5.5 V supply range and 105 C temperature rating allow direct operation from 3.3 V or 5 V industrial rails without level shifting. In a typical node, the MCU samples a thermistor or pressure bridge through the ADC, filters the result in firmware, and reports over the USART or TWI bus to a gateway. The trade-off is that 4 KB of Flash limits the protocol stack to lightweight formats such as Modbus RTU or a custom frame, so designers needing TCP/IP should step up to the ATMEGA168PB-ANR.
Recommended
Battery-Powered IoT Endpoints
The ATMEGA48PB-ANR is suited to battery-powered IoT endpoints because picoPower technology and multiple sleep modes keep average current low, while the 1.8 V to 5.5 V operating range permits direct connection to two AA cells or a single Li-ion cell. In a typical endpoint, the MCU wakes on a timer or external interrupt, reads a sensor through the 10-bit ADC, transmits a short packet via SPI to a sub-GHz or BLE radio, then returns to power-down. The 512 B SRAM is adequate for packet buffers and state machines, but the 4 KB Flash constrains the radio stack, so designs using full BLE or LoRaWAN stacks should migrate to the ATMEGA168PB-ANR, which shares the 32-pin TQFP footprint.
Recommended
Consumer Appliance Control Panels
The ATMEGA48PB-ANR suits consumer appliance control panels because its 27 I/O lines drive buttons, LEDs, and relays directly, and the three timer/counters generate the PWM and timing signals needed for motor speed control and buzzer tones. The 4 KB Flash holds the user interface state machine and safety interlocks, while the 256 B EEPROM stores user settings across power cycles without an external memory device. In a washing machine or coffee maker, the MCU scans a keypad, drives a multiplexed display, and monitors a thermistor through the ADC. The 105 C rating provides margin inside warm appliance enclosures, and the 32-pin TQFP keeps the control board compact.
Recommended
Motor Control Front-Ends
The ATMEGA48PB-ANR works as a motor control front-end because its three flexible timer/counters with compare modes generate complementary PWM outputs for half-bridge gate drivers, and the enhanced analog comparator provides fast overcurrent detection without CPU intervention. The 20 MHz core executes the commutation loop quickly enough for brushed DC and simple BLDC control, while the 10-bit ADC samples current-sense shunts and back-EMF dividers. In a typical design, the MCU runs a PI speed loop at 1 kHz and updates the PWM duty cycle through timer registers. The 4 KB Flash is sufficient for a basic six-step commutation table, but field-oriented control algorithms generally require the larger ATMEGA168PB-ANR.
Recommended
Lighting and LED Controllers
The ATMEGA48PB-ANR fits lighting and LED controllers because its timer/counters produce multiple PWM channels for dimming, and the 27 GPIO lines can drive relay or MOSFET stages for multi-channel fixtures. The 1.8 V to 5.5 V supply range allows the MCU to run from the same 3.3 V rail as the LED driver logic, simplifying the power tree. In a typical fixture, the MCU receives a dimming command over TWI or USART, updates the PWM duty cycle, and monitors a temperature sensor through the ADC to protect the LEDs. The 4 KB Flash holds the dimming curves and communication protocol, while the 256 B EEPROM stores the last brightness level for power-on restore.
Recommended
Automotive Body Electronics
The ATMEGA48PB-ANR can serve automotive body electronics such as window, mirror, and seat control modules because the 105 C temperature rating and 1.8 V to 5.5 V supply range tolerate the automotive 5 V rail and cabin temperature extremes. The 27 GPIO lines interface with switches, Hall sensors, and relay drivers, while the enhanced analog comparator detects stall currents in small motors. In a typical module, the MCU debounces switch inputs, drives a relay through a low-side driver, and reports status over a LIN or CAN transceiver connected to the USART. Note that the ATMEGA48PB-ANR is not AEC-Q100 qualified, so safety-critical automotive designs should use a qualified variant.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA48PB-ANR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA48PB-AN | ATMEGA48PA-AU | ATMEGA88PB-ANR | ATMEGA168PB-ANR |
|---|---|---|---|---|---|
| Package | 32-pin TQFP (7x7 mm) | 32-pin TQFP (7x7 mm) - same | 32-pin TQFP (7x7 mm) - same | 32-pin TQFP (7x7 mm) - same | 32-pin TQFP (7x7 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 4 KB (2K x 16) | 4 KB | 4 KB | 8 KB | 16 KB |
| SRAM | 512 B | 512 B | 512 B | 1 KB | 1 KB |
| EEPROM | 256 B | 256 B | 256 B | 512 B | 512 B |
| Maximum Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Operating Voltage | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V |
| GPIO Lines | 27 | 27 | 27 | 27 | 27 |
| Packaging | Tape & Reel | Tray | Tray | Tape & Reel | Tape & Reel |
| Functional Safety (FuSa) Support | Yes (PB series) | Yes (PB series) | No (PA series) | Yes (PB series) | Yes (PB series) |
Key Differentiators
- PB-series feature set at 4 KB Flash (vs ATMEGA48PA-AU)
- Tape-and-reel packaging for automated assembly (vs ATMEGA48PB-AN)
- Lowest cost entry into the ATmegaPB family (vs ATMEGA168PB-ANR)
- picoPower low-power operation (vs ATMEGA48PA-AU)
Design Notes
Decouple every VCC pin (pins 4 and 6) with a 100 nF ceramic capacitor placed within 2 mm of the pin, and add a 10 uF bulk capacitor on the board rail. The AVCC pin (pin 29) should be filtered with a separate 100 nF capacitor plus a 10 uH inductor or ferrite bead from VCC to keep ADC noise low. AREF (pin 30) should be bypassed with 100 nF to GND when using the internal reference. Estimated: at 20 MHz and 5 V, the core draws roughly 10-12 mA, so the 100 nF capacitors must have low ESR to supply the switching transients.
When migrating a design from the ATmega48PA/88PA/168PA to the ATmega48PB, Microchip application note 00002605A requires two conditions: pin 3 must not be actively driven if it is connected to GND and the analog comparator output (ACO) is enabled, and pin 6 must not be actively driven if it is connected to VCC. Violating these conditions can cause excessive current or erratic operation. Review the schematic for any driven connection to pins 3 and 6 before substituting the PB device.
Route the 32-pin TQFP with a solid ground plane under the device and keep the crystal or resonator traces on pins 13 and 14 as short as possible, with a guard ring tied to GND. Place the 100 nF decoupling capacitors on the same side as the MCU to avoid via inductance. For the 10-bit ADC, keep analog input traces away from the PWM outputs on port B and use a star ground connection between AGND and DGND at the AVCC decoupling point.
The ATMEGA48PB-ANR is rated to 105 C ambient, but self-heating must be considered in sealed enclosures. Estimated: at 5 V and 12 mA the device dissipates about 60 mW, and the 32-pin TQFP theta_JA is roughly 60-70 C/W on a standard 2-layer board, giving a junction rise of only 4 C. Thermal design is therefore rarely the limiting factor; the 105 C rating is driven by process and reliability limits rather than power dissipation.
Compliance Information
Mouser lists the ATMEGA48PB-ANR as GREEN tape and reel, indicating RoHS compliance and lead-free construction. The device is not AEC-Q100 qualified, so it is not intended for safety-critical automotive applications. REACH, halogen-free, and conflict-minerals status were not stated in the retrieved data.
