PIC18F2520-E/SP - 8-bit MCU, 32KB Flash, 28-SPDIP | Microchip
MPN: PIC18F2520-E/SP ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.5 | $7.50 |
| 10 | $6.85 | $68.50 |
| 100 | $6.12 | $612.00 |
| 500 | $5.55 | $2,775.00 |
| 1,000 | $5.1 | $5,100.00 |
PIC18F2520-E/SP Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (Flash/ROM), data memory (RAM), and a fixed set of peripherals (I/O, timers, ADC, communication) into one package. PIC microcontrollers use a Harvard RISC architecture with a small, fixed instruction set optimized for C code generation, sitting in the broader hierarchy: 8-bit MCU -> microcontroller -> embedded controller -> semiconductor device.
Key specifications include 25 digital I/O pins, a 10-bit ADC with up to 10 input channels, two 8-bit and three 16-bit timers, two USART modules, one MSSP (SPI/I2C) peripheral, two analog comparators, and a nanoWatt power-managed sleep mode drawing sub-microamp currents. The enhanced flash supports in-circuit serial programming (ICSP) via two pins, enabling field firmware updates without removing the part from the board.
The 28-pin SPDIP package is preferred for hobbyist, educational, and through-hole prototype designs, while SOIC, QFN and QFP variants cover surface-mount boards. Hardware features such as the Fail-Safe Clock Monitor, Watchdog Timer with dedicated RC oscillator, and wide operating voltage make the PIC18F2520-E/SP a robust general-purpose choice for embedded control applications.
Typical uses include industrial sensor interfaces, motor control signal conditioning, consumer appliance control boards, HVAC thermostats, and battery-powered instrumentation. The combination of nanoWatt low-power modes and AC-driven operation makes the part flexible for both line-powered and energy-harvesting designs.
When designing with this MCU, note that the SPDIP package requires through-hole PCB layout; for reflow-soldered production, use the SO or QFN equivalents in the same PIC18F2520 family. Always provide a 100 nF decoupling capacitor adjacent to VDD and ensure the MCLR reset circuit uses a 10 kohm pull-up with a diode to VDD to allow in-circuit programming.
This page synthesizes drop-in alternatives in the same 28-SPDIP footprint, application notes, and pricing not found in a single distributor listing.
Drop-in alternatives for PIC18F2520-E/SP — 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 PIC18F2520-E/SP (same form factor and footprint) — differing in Package, Operating Temperature, Program Memory (Flash), Timers, Internal Oscillator.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F2520-I/SP
✅ Drop-In✓ In Stock
$3.33 / Unit
View Datasheet →PIC18F2525-I/SP
✅ Drop-In✓ In Stock
$5.45 / Unit
View Datasheet →PIC18F2420-I/SP
✅ Drop-In✓ In Stock
$5.22 / Unit
View Datasheet →PIC18F2480-I/SP
✅ Drop-In✓ In Stock
$4.1 / Unit
View Datasheet →PIC18F2580-I/SP
✅ Drop-In✓ In Stock
$4.55 / Unit
View Datasheet →PIC18F2520-E/SP Maximum Ratings & Electrical Characteristics
| Device Family | PIC18F |
| Core | 8-bit PIC RISC |
| Program Memory (Flash) | 32 KB |
| RAM | 3968 bytes |
| EEPROM | 256 bytes |
| Maximum CPU Speed | 40 MHz (10 MIPS) |
| Operating Voltage (Vdd) | 2.0 V to 5.5 V |
| I/O Pins | 25 |
| ADC | 10-bit, up to 10 channels |
| Timers | 2 x 8-bit, 3 x 16-bit |
| Communication | 2 x USART, 1 x MSSP (SPI/I2C) |
| Analog Comparators | 2 |
| Package | 28-SPDIP (Skinny PDIP, through-hole) |
| Temperature Grade | Extended -40C to +125C |
| Technology | nanoWatt low-power |
PIC18F2520-E/SP Pin Configuration
| Pin 1 | MCLR — Master Clear (reset) input, programming voltage entry |
| Pin 2 | RA0/AN0 — PORTA bit 0 / ADC input 0 |
| Pin 3 | RA1/AN1 — PORTA bit 1 / ADC input 1 |
| Pin 4 | RA2/AN2/VREF- — PORTA bit 2 / ADC input 2 / negative reference |
| Pin 5 | RA3/AN3/VREF+ — PORTA bit 3 / ADC input 3 / positive reference |
| Pin 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Pin 7 | RA5/AN4/SS — PORTA bit 5 / ADC input 4 / SPI slave select |
| Pin 8 | VSS — Ground reference |
| Pin 9 | OSC1/CLKIN — Crystal oscillator input / external clock in |
| Pin 10 | OSC2/CLKOUT — Crystal oscillator output / clock out |
| Pin 11 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 clock I/O |
| Pin 12 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 |
| Pin 13 | RC2/CCP1 — PORTC bit 2 / CCP1 PWM output |
| Pin 14 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Pin 15 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Pin 16 | RC5/SDO — PORTC bit 5 / SPI data out |
| Pin 17 | RC6/TX/CK — PORTC bit 6 / USART TX / clock |
| Pin 18 | RC7/RX/DT — PORTC bit 7 / USART RX / data |
| Pin 19 | VSS — Ground reference |
| Pin 20 | VDD — Positive supply voltage |
| Pin 21 | RB0/INT0 — PORTB bit 0 / external interrupt 0 |
| Pin 22 | RB1/INT1 — PORTB bit 1 / external interrupt 1 |
| Pin 23 | RB2/INT2 — PORTB bit 2 / external interrupt 2 |
| Pin 24 | RB3/CCP2 — PORTB bit 3 / CCP2 (alt) |
| Pin 25 | RB4 — PORTB bit 4 |
| Pin 26 | RB5 — PORTB bit 5 |
| Pin 27 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Pin 28 | RB7/PGD — PORTB bit 7 / ICSP data |
Typical Applications
PIC18F2520-E/SP is suitable for 6 applications: Industrial Sensor Hub, Consumer Appliance Control, Automotive Under-Hood Sensor Interface, HVAC Thermostat Controller, Educational / Hobbyist MCU Training, Battery-Powered Data Logger.
Industrial Sensor Hub
The PIC18F2520-E/SP suits industrial sensor hubs where multiple analog inputs need 10-bit ADC conversion while staying within a 3.3V or 5V supply rail. Its 32 KB flash holds calibration tables and small protocol stacks, while the 3968 bytes of RAM buffer raw sensor frames before forwarding via USART to a gateway. The Fail-Safe Clock Monitor protects against crystal failure that would otherwise stall time-critical PLC interaction.
Recommended
Consumer Appliance Control
In washing machines, dishwashers and coffee makers the PIC18F2520-E/SP drives motor PWM, reads keypad inputs and toggles triac outputs via the 25 available I/O pins. The nanoWatt sleep modes cut standby current below regulatory 0.5 W limits between user interactions, while the 28-SPDIP package is ideal for hand-soldered repair-friendly appliance boards. ICSP allows late-stage firmware customization during production.
Recommended
Automotive Under-Hood Sensor Interface
The extended -40C to +125C temperature grade of PIC18F2520-E/SP allows placement in engine-bay sensor clusters where ambient heat exceeds commercial-grade limits. Its 10 MIPS throughput runs signal conditioning for knock sensors and throttle position, while the 10-bit ADC digitizes analog feedback at high sampling rates. Hardware Watchdog Timer with dedicated RC oscillator keeps the controller responsive during electrical transients.
Recommended
HVAC Thermostat Controller
Wall thermostats combine low power consumption with reliable analog measurement, both well served by the PIC18F2520-E/SP. The two analog comparators enable direct NTC thermistor reading without a buffer op-amp, while nanoWatt idle mode keeps two-AA battery designs alive for years. The 32 KB flash stores scheduling logic, while ICSP lets installers apply firmware patches in the field.
Recommended
Educational / Hobbyist MCU Training
The PIC18F2520-E/SP is widely adopted in university embedded courses because the 28-SPDIP package fits breadboards and the free MPLAB X IDE plus XC8 compiler support in-circuit debugging and C programming. The 32 KB headroom supports textbook exercises and modest student projects. ICSP lets instructors erase and reprogram chips in seconds, dramatically shortening lab iteration cycles.
Recommended
Battery-Powered Data Logger
Field-portable data loggers rely on the PIC18F2520-E/SP nanoWatt sleep mode that draws only sub-microamp currents between ADC samples. The 10-bit ADC at up to 10 channels captures multi-sensor data into the 3968-byte RAM buffer, then flushes records to EEPROM or external FRAM. The wide 2.0V to 5.5V Vdd range supports direct Li-ion, NiMH and alkaline packs without a boost regulator.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F2520-E/SP — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F2520-I/SP | PIC18F2525-I/SP | PIC18F2420-I/SP |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SPDIP | 28-SPDIP - same | 28-SPDIP - same | 28-SPDIP - same |
| Program Memory (Flash) | 32 KB | 32 KB | 48 KB | 16 KB |
| RAM | 3968 bytes | 3968 bytes | 3968 bytes | 3968 bytes |
| Maximum CPU Speed | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) |
| Operating Voltage | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V |
| Temperature Grade | Extended -40C to +125C | Industrial -40C to +85C | Industrial -40C to +85C | Industrial -40C to +85C |
| ADC Channels | 10 (10-bit) | 10 (10-bit) | 10 (10-bit) | 10 (10-bit) |
| Approx Unit Price (qty 1) | $7.50 | $7.20 | $8.30 | $6.40 |
Key Differentiators
- Extended temperature grade to +125C (vs PIC18F2520-I/SP)
- Higher flash density for richer firmware stacks (vs PIC18F2420-I/SP)
- Lower cost than the 64 KB PIC18F2620 (vs PIC18F2620)
- 28-SPDIP through-hole ease of prototyping (vs PIC18F2520-E/SO)
Design Notes
Place a 100 nF decoupling capacitor within 5 mm of the VDD pin (pin 20) and a bulk 10 uF tantalum or aluminum capacitor at the board supply entry. Add a 10 kohm pull-up resistor on MCLR (pin 1) and clamp it to VDD with a 1N4148 diode to support high-voltage ICSP entry. Keep crystal traces for OSC1/OSC2 short and ground them on both sides to suppress EMI. Source: Microchip PIC18F2520 datasheet and MPLAB ICD hardware design guide.
Use the nanoWatt sleep modes (SLEEP instruction) to drop supply current to sub-microamp levels between ADC samples. Estimated: at Vdd=3.3V and Watchdog Timer + Timer1 oscillator active, sleep current is typically 1-3 uA. Disable peripherals via PMDx registers before sleep and wake via external interrupt or RTCC alarm to maximize battery life.
Do not confuse the -E (extended temperature, -40C to +125C) suffix with the -I (industrial, -40C to +85C) suffix; only -E operates reliably in engine-bay environments. Always select the matching programming voltage entry scheme (low-voltage vs high-voltage ICSP) and ensure the PGC/PGD lines are not loaded with capacitive loads > 50 pF during debugging. Estimated: long PGC traces require a 100 ohm series terminator to prevent ringing during high-voltage ICSP entry.
Route the analog inputs (RA0-RA5) as far from the USART lines and PWM outputs as possible to avoid coupling noise into ADC readings. Use a dedicated analog ground pour connected at a single point to the digital ground near the regulator, and place a small RC filter (10 ohm + 100 nF) on each analog pin that connects to noisy external sensors. Source: Microchip analog design tips application note.
Compliance Information
RoHS and REACH compliant per Microchip product declaration; lead-free process. Not AEC-Q100 qualified - it is a general-purpose MCU rather than an automotive-grade part. Conflict-minerals declaration on file at Microchip.
