PIC18F1320-I/ML: especificaciones, pinout, alternativas y abastecimiento del MCU de 8 bits de Microchip (2026)

What is the PIC18F1320-I/ML and what does it offer?

The PIC18F1320-I/ML is a Microchip 8-bit PIC18 Harvard RISC microcontroller in a 28-pin QFN (6x6 mm) surface-mount package, integrating 8 KB (4K x 16) of Enhanced Flash program memory, 256 bytes of SRAM, and 256 bytes of EEPROM on a single die. The PIC18 core runs up to 40 MHz at 10 MIPS peak instruction throughput from a wide 2.0 V to 5.5 V supply, with the industrial -I suffix rating the part from -40 °C to +85 °C. On-chip peripherals include a 10-bit ADC with up to 7 channels, an enhanced USART, an MSSP module that handles both SPI and I²C, and Capture/Compare/PWM (CCP) timers, while Microchip's nanoWatt Technology drops standby current to 0.1 µA typical in Sleep mode. As of 2026-10-06, the part carries an ACTIVE lifecycle status with 99,999 units in stock at XAIPART, and tiered distributor pricing runs from $3.85 at quantity 1 down to $2.31 per unit at 1,000 pieces on the same date. The 28-QFN (6x6 mm) footprint targets compact layouts in industrial sensor nodes, HVAC peripherals, low-power remote controls, and portable medical wearables. See the PIC18F1320-I/ML product page for current stock and pricing.

How do you design a working circuit with the PIC18F1320-I/ML?

Designing with the PIC18F1320-I/ML starts with its two VDD/VSS pin pairs (pins 9-10 and pins 19-20), which feed the core logic and the I/O drivers. Place a 100 nF X7R ceramic decoupling capacitor within 5 mm of each VDD pin and bulk-decouple with at least 10 µF near the regulator output. The device runs from a 2.0 V to 5.5 V supply, so it accepts 3.3 V regulated rails, 2xAA battery stacks, or rectified 5 V mains without level shifters. MSL Level 1 means unlimited floor life below 30 °C / 85 % RH, which simplifies incoming inspection and assembly-line handling. RoHS compliance is confirmed, and the lead-free finish supports standard lead-free reflow profiles up to a 260 °C peak.

Oscillator configuration is the next design decision. The PIC18F1320-I/ML offers ten software-selectable oscillator modes via the FOSC3:FOSC0 configuration bits, including an internal 31 kHz LF oscillator and an internal 8 MHz HF oscillator, plus external HS, XT, and LP crystal modes and EC (external clock) inputs. PLL options are available for higher system clock speeds at lower external crystal frequencies. For cost-sensitive, space-constrained sensor pods, the internal 31 kHz LF oscillator eliminates the crystal entirely and lets the device wake from Sleep on interrupt-on-change events on RB4-RB7 (pins 15-18).

For analog designs, the 10-bit ADC draws from up to 7 channels multiplexed onto PORTA pins (RA0-RA5, plus RA6/RA7). The ADC references are dedicated: VREF+ sits on RA3/AN3 (pin 4) and VREF- sits on RA2/AN2 (pin 3). Driving VREF+ from a low-noise reference rather than VDD materially improves ADC accuracy on noisy rails, especially in HVAC and industrial-sensor environments where switching supplies couple onto the supply. Acquisition time and conversion clock are configured in firmware via ADCON registers; keep the source impedance below 10 kΩ to settle within the acquisition window.

Digital communication uses the enhanced USART on RC6/TX (pin 27) and RC7/RX (pin 28) for RS-232, RS-485 (with external transceiver), or LIN slave links. The MSSP module on RC3/SCK/SCL and RC4/SDI/SDA supports both SPI (4-wire, including RC5/SDO) and I²C (master or slave, 7-bit or 10-bit addressing). Add 4.7 kΩ pull-ups on the I²C SCL/SDA lines for standard-mode (100 kHz) and fast-mode (400 kHz) bus operation. The enhanced USART supports auto-baud detection, which simplifies LIN and DMX firmware stacks.

PWM and timing come from the Timer0/1/2 modules and two CCP channels: CCP1 maps to RC2/CCP1 (pin 23) and CCP2 maps to RC1/CCP2 (pin 22). Timer1 can run from an external 32.768 kHz watch crystal on RC0/T1OSO (pin 21) and RC1/T1OSI (pin 22) for real-time-clock duty cycles with sub-second resolution. External interrupt inputs are INT0 on RB0 (pin 11) and INT1 on RB1 (pin 12), useful for zero-crossing detection on AC line-powered HVAC boards. The 16 digital I/O pins provide ample headroom for keypad scanning, LED driving, and parallel-interface glue logic without external expanders.

Low-power firmware is where the PIC18F1320-I/ML earns its keep. The 0.1 µA typical Sleep current is achievable only with peripherals clock-gated, the WDT disabled in configuration bits, and the secondary oscillator turned off. Use the SEC_RUN and SEC_IDLE power-managed modes when running from the 31 kHz LF source between sensor reads. Wake on INT0, INT1, or RB port interrupt-on-change on RB4-RB7 (pins 15-18), take the ADC reading, transmit via MSSP or USART, and return to Sleep. A typical industrial sensor node draws 0.1 µA in Sleep with brief active bursts on the 8 KB Flash holding the firmware and the 256-byte EEPROM storing calibration constants.

Development tools are mature: MPLAB X IDE, the XC8 C compiler (free optimization levels), and MPLAB ICD debug probes program and debug the part through ICSP. For firmware updates in the field, the Enhanced Flash supports self-programming under software control, letting a bootloader pull new images over the USART or MSSP without an external programmer.

Engineer takeaway: Decouple within 5 mm of each VDD pin, drive VREF+ from a low-noise reference if ADC accuracy matters, and exploit nanoWatt Sleep aggressively between sensor events to hit the 0.1 µA standby figure the datasheet promises.

Which parts are drop-in alternatives to the PIC18F1320-I/ML?

Microchip publishes five direct alternatives in the same 28-QFN (6x6 mm) footprint, each differing by one parametric axis rather than by firmware or layout. The table below compares the four most useful substitutes; full parametric data for each part is on its product page.

PIC18LF1320-I/ML: The low-voltage variant shares the same die, 28-QFN footprint, and peripheral set, but caps VDD at 3.6 V instead of 5.5 V. Use it as a true drop-in when the system runs strictly from a 3.3 V rail or a single-cell Li-ion battery; if the design ever sees 5 V, stay with the F variant. See the PIC18LF1320-I/ML product page for current stock.

PIC18F1320T-I/ML: The T suffix denotes a tape-and-reel packaging code, not an electrical change. The die, footprint, and parametric data are identical, so the T variant is a procurement convenience for SMT assembly lines rather than a redesign path. Stocked on the PIC18F1320T-I/ML product page.

PIC18F1320-H/ML: The H suffix extends the operating range to -40 °C to +150 °C for under-hood automotive and harsh-industrial environments. Same die, same 8 KB Flash, same peripheral set — drop-in for designs that hit >85 °C. Available on the PIC18F1320-H/ML product page.

PIC18F1220-I/ML: The cost-down sibling halves Flash to 4 KB while keeping the 256-byte SRAM, 256-byte EEPROM, 10-bit ADC, and identical 28-QFN footprint. It is the right choice when firmware fits comfortably under 4 KB and BOM cost matters more than headroom. Documented on the PIC18F1220-I/ML product page.

PIC18F2320-I/ML: Also in the 28-QFN family but with an extended instruction set and different peripheral mapping. The database entry flags 'verify peripheral mapping' before substituting; do not assume register-for-register compatibility with the PIC18F1320.

For engineers weighing a different 8-bit MCU family entirely, the PIC16LF18313-I/SN Complete Guide covers the smaller-footprint PIC16 alternative with 7 KB Flash. Browse the XAIPART component catalog for full parametric filters across the PIC16, PIC18, and PIC24 families.

Engineer takeaway: Pick LF when VDD stays at 3.3 V, H when the box hits >85 °C, T for assembly-line convenience, and 1220 when firmware fits under 4 KB. Cross-check the catalog for current pricing before committing to a substitute.

What is the supply and lifecycle status of the PIC18F1320-I/ML?

The PIC18F1320-I/ML is in ACTIVE production lifecycle status at Microchip, with no announced obsolescence, EOL, or migration notices as of 2026-10-06. XAIPART's inventory feed shows 99,999 units in stock, and the part is listed across at least four major authorized channels: DigiKey (PN 529808), Mouser, LCSC Electronics (C184190), and the Octopart aggregator surfacing 13 distributors in total. Minimum order quantity is 1 piece, so prototypes and small builds are not gated by reel MOQs. The MSL Level 1 floor-life rating removes humidity-bake handling on incoming inspection.

Pricing as of 2026-10-06 follows five published tiers: $3.85 at quantity 1, $3.46 at quantity 10, $2.95 at quantity 100, $2.62 at quantity 500, and $2.31 at quantity 1,000. That is a 40 % price erosion from 1-piece to 1,000-piece breaks, typical for an entrenched PIC18 product where volume discounts are standard. Industrial temperature grade (-I) is the most readily stocked variant; -E (extended) variants and -H (automotive) variants may carry longer lead times depending on the channel.

RoHS compliance is verified, lead-free is confirmed, and the surface-mount 28-QFN (6x6 mm) package is compatible with standard lead-free reflow profiles. For high-volume commitments, requesting a Microchip Direct quote locks multi-year supply and can include scheduling flexibility that distributor channels do not offer. Lead time for production orders of 5,000+ pieces is typically 6-10 weeks based on the 2026-10-06 distributor snapshot, with DigiKey and Mouser holding small reel quantities for immediate shipment.

The broader 8-bit MCU market is currently constrained on certain PIC16F and PIC18F SKUs due to wafer allocation cycles, but the PIC18F1320-I/ML has not been flagged in any allocation notice and is not on any PCN list as of 2026-10-06. Engineers can treat the part as a long-term staple for new designs through at least 2027.

Engineer takeaway: Active lifecycle, four-plus authorized channels, 99,999 in-stock units, and $2.31 per unit at 1,000-piece quantities as of 2026-10-06 make this a low-risk procurement for both prototypes and production runs. Request a Microchip Direct quote for multi-year supply commitments.

What trends should buyers of the PIC18F1320-I/ML watch?

Three trends will shape sourcing and design decisions for the PIC18F1320-I/ML through 2026-2027. First, the 8-bit MCU market is consolidating around low-power, low-cost nodes, and Microchip's nanoWatt Technology positioning reinforces the PIC18F1320-I/ML's role as a Sleep-mode workhorse for battery and energy-harvesting products. The verified 0.1 µA typical Sleep figure is a real procurement differentiator against PIC16 and competing 8-bit MCUs that typically land at 1-10 µA in equivalent Sleep modes, and it directly enables multi-year battery life on coin cells.

Second, the wide 2.0 V to 5.5 V supply range is increasingly valuable as designs move away from 5 V rails toward 3.3 V coin-cell and single-cell Li-ion chemistries. The PIC18F1320-I/ML supports both ends natively, while the LF variant (PIC18LF1320-I/ML) covers 3.6 V-constrained systems. When the system requires a single 5 V rail, the F variant must be specified — designers occasionally order the LF by mistake and discover it on the bench. Verify the VDD ceiling against your regulator's nominal-plus-tolerance output before committing.

Third, migration pressure toward 32-bit ARM Cortex-M0+ parts is real but uneven. There is no pin-compatible Cortex-M0+ in the same 28-QFN (6x6 mm) footprint, so a migration to 32-bit requires both footprint review and full firmware re-validation. Microchip's own SAM D10/D11 families are the natural path upward for compute-bound designs, but they do not drop into a PIC18F1320 socket. For most cost-sensitive, low-power designs that the PIC18F1320-I/ML targets, the 8-bit architecture remains fit-for-purpose. For designers exploring 16-bit alternatives, the MSP430G2210IDR Complete Guide covers TI's competing 16-bit family with 2 KB Flash, while the MSP430F5329IPN Complete Guide covers a higher-end 16-bit MCU with 128 KB Flash at 25 MHz.

Watch the Microchip PIC18F family product roadmap for Flash-density upgrades in the same 28-QFN footprint — the PIC18F2320-I/ML line hints at extended-instruction variants in this package family, though peripheral mapping must be verified before substituting. Pair the PIC18F1320-I/ML with Microchip's MCP6S28 SPI programmable-gain amplifier or the MCP4651 I²C digital potentiometer on the SPI/I²C bus for analog front-end designs in HVAC and instrumentation applications. Browse the XAIPART blog for sourcing updates and pairing recommendations.

Engineer takeaway: The PIC18F1320-I/ML is positioned to remain a stable 8-bit workhorse through 2027, but verify VDD ceilings, lock multi-year supply at Microchip Direct for high-volume builds, and budget for full firmware re-validation if you later migrate to a 32-bit ARM Cortex-M0+ part.