PIC18LF27K40T-I/SO - 64MHz 8-Bit XLP MCU 128KB Flash | Microchip
MPN: PIC18LF27K40T-I/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.42 | $3.42 |
| 10 | $3.08 | $30.80 |
| 100 | $2.74 | $274.00 |
| 500 | $2.41 | $1,205.00 |
| 1,000 | $2.07 | $2,070.00 |
PIC18LF27K40T-I/SO Overview
A microcontroller (MCU) is a single-chip computer containing a CPU core, non-volatile program memory (Flash), working RAM, and a rich set of on-chip peripherals such as timers, ADC/DAC, communication interfaces, and GPIO. Within the broader semiconductor taxonomy, an MCU sits inside the digital IC family, which itself is part of the integrated circuits hierarchy. The PIC18 family is Microchip's 8-bit mainstream architecture, distinguished by a RISC-like instruction set, deterministic interrupt latency, and the XLP (eXtreme Low Power) feature set designed for battery-powered products.
Key features of the PIC18LF27K40 include the wide 1.8V to 5.5V operating range that supports both 3.3V and 5V rails, deep-sleep currents in the nanoamp range for XLP applications, hardware CRC and memory scan blocks for functional safety, and the 64 MHz internal oscillator that eliminates the need for an external crystal in cost-sensitive designs. The 28-pin SOIC package is a JEDEC-standardized wide-body outline (.300 inch / 7.5 mm body width) widely supported by hand-solder and reflow processes.
The device leverages the PIC18 enhanced mid-range core with a modified Harvard architecture, providing separate program and data buses for predictable instruction throughput. Its Core Independent Peripherals, such as the CWG (Complementary Waveform Generator), allow complex waveform synthesis without CPU intervention, while the configurable logic cell enables glue-logic replacement. Hardware math accelerators and zero-cycle context switching help optimize real-time performance.
Typical applications include low-power IoT sensor nodes, battery-powered consumer electronics, industrial control and HMI nodes, USB-to-UART bridge dongles, automotive body and interior modules, and white-goods motor control. The combination of XLP nanoWatt sleep modes, ample Flash, and rich analog peripherals makes it suitable for any 5V-tolerant design where energy budget is critical.
When designing with this device, choose the appropriate operating voltage range (1.8V-3.6V for LF, or up to 5V for F variant) and provide adequate decoupling on VDD/AVDD. The 28-pin SOIC footprint simplifies hand-prototyping, and the on-chip debug (ICD) interface allows in-circuit programming without removing the device from the board.
This page synthesizes distributor pricing, drop-in alternative cross-references, and practical design notes not found in the manufacturer datasheet, enabling engineers to evaluate the PIC18LF27K40T-I/SO quickly for new designs and BOM substitutions.
Drop-in alternatives for PIC18LF27K40T-I/SO — 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 PIC18LF27K40T-I/SO (same form factor and footprint) — differing in ADC, Package, Operating Temperature, I/O Pins, EEPROM.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18LF27K40-I/SO
✅ Drop-In✓ In Stock
$2.55 / Unit
View Datasheet →PIC18LF27K40T-I/ML
✅ Drop-In✓ In Stock
$1.85 / Unit
View Datasheet →PIC18LF27K40-I/ML
✅ Drop-In✓ In Stock
$1.18 / Unit
View Datasheet →PIC18LF26K40-I/SP
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC18F27K40T-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18LF26K42-I/SO
✅ Drop-In✓ In Stock
$1.92 / Unit
View Datasheet →PIC18LF27K40T-I/SO Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC18 8-bit enhanced mid-range |
| Operating Frequency | 64 MHz |
| Flash Program Memory | 128 KB (64K x 16) |
| RAM | 4 KB |
| EEPROM | 256 B |
| Operating Voltage Range | 1.8 V to 3.6 V (LF variant) |
| Package | 28-pin SOIC (SO) 7.5 mm body |
| Pin Count | 28 |
| Mounting Type | Surface Mount |
| ADC | 10-bit |
| DAC | 5-bit |
| Operating Temperature | -40 C to +85 C (Industrial -I) |
| I/O Pins | 25 (approximate, depends on peripheral config) |
| Low-Power Technology | XLP nanoWatt |
| Peripherals | PWM, CCP, CWG, HLT, WWDT, SCAN/CRC, Comparators |
| MSL Level | 1 (unlimited at <=30 C/85% RH) |
| RoHS Status | Compliant |
PIC18LF27K40T-I/SO Pin Configuration
| Pin 1 | RA5/MCLR — GPIO RA5 / Master Clear (reset) input |
| Pin 2 | RA0 — GPIO RA0 / analog input |
| Pin 3 | RA1 — GPIO RA1 / analog input |
| Pin 4 | RA2 — GPIO RA2 / analog input |
| Pin 5 | RA3 — GPIO RA3 / analog input |
| Pin 6 | RA4 — GPIO RA4 / analog input |
| Pin 7 | VDD — Positive supply voltage |
| Pin 8 | VSS — Ground reference |
| Pin 9 | OSC1/RA7 — External oscillator input / GPIO RA7 |
| Pin 10 | OSC2/RA6 — External oscillator output / GPIO RA6 |
| Pin 11 | RC0 — GPIO RC0 |
| Pin 12 | RC1 — GPIO RC1 |
| Pin 13 | RC2 — GPIO RC2 |
| Pin 14 | RC3 — GPIO RC3 / SCL |
| Pin 15 | RC4 — GPIO RC4 / SDA |
| Pin 16 | RC5 — GPIO RC5 |
| Pin 17 | RC6 — GPIO RC6 / TX |
| Pin 18 | RC7 — GPIO RC7 / RX |
| Pin 19 | VSS — Ground reference |
| Pin 20 | VDD — Positive supply voltage |
| Pin 21 | RB0 — GPIO RB0 / interrupt-on-change |
| Pin 22 | RB1 — GPIO RB1 / interrupt-on-change |
| Pin 23 | RB2 — GPIO RB2 / interrupt-on-change |
| Pin 24 | RB3 — GPIO RB3 / interrupt-on-change |
| Pin 25 | RB4 — GPIO RB4 / interrupt-on-change |
| Pin 26 | RB5 — GPIO RB5 / interrupt-on-change |
| Pin 27 | RB6 — GPIO RB6 / ICD clock |
| Pin 28 | RB7 — GPIO RB7 / ICD data |
Typical Applications
PIC18LF27K40T-I/SO is suitable for 6 applications: Battery-Powered IoT Sensor Nodes, Industrial Control and HMI Nodes, USB-to-UART Bridge Dongles, Automotive Body and Interior Modules, White Goods and Small Appliance Control, Consumer Electronics and Wearables.
Battery-Powered IoT Sensor Nodes
The PIC18LF27K40T-I/SO's XLP nanoWatt sleep currents under 50 nA and 1.8V minimum supply make it ideal for years-of-life IoT sensor nodes on a single coin cell or 2x AA battery pack. Its hardware SCAN/CRC peripheral can periodically check ADC sensors without waking the CPU, while the 64 MHz HFINTOSC eliminates the external crystal cost. Compared to discrete sleep timer + MCU designs, the integrated solution cuts BOM cost and board area.
Recommended
Industrial Control and HMI Nodes
The 64 MHz PIC18 core and 128 KB Flash provide ample headroom for industrial control algorithms, Modbus stacks, and HMI menu graphics. The 10-bit ADC handles analog sensor conditioning, the comparators provide fast hardware overcurrent detection, and the CWG peripheral drives motor or solenoid PWM signals without CPU load. The wide -40 C to +85 C industrial temperature range and robust SOIC package suit factory-floor vibration environments.
Recommended
USB-to-UART Bridge Dongles
The 64 MHz core and 128 KB Flash comfortably fit USB CDC class drivers and protocol translation stacks for USB-to-UART bridge dongles. The on-chip 10-bit ADC and 5-bit DAC enable protocol-aware status LED dimming, while the 28-SOIC footprint fits inside compact dongle enclosures. The LF variant's 3.6V maximum supply aligns with USB 5V rail through a simple LDO, keeping BOM small and cost low.
Recommended
Automotive Body and Interior Modules
The PIC18LF27K40T-I/SO handles non-safety automotive body electronics such as interior lighting, seat controllers, and ambient temperature displays. Its industrial -40 C to +85 C rating covers most cabin environments, the 64 MHz core runs LIN node software stacks, and the 10-bit ADC reads sensor inputs directly. For under-hood or AEC-Q100 mandated designs, designers should select the PIC18F27K40 AEC-Q100 qualified equivalent instead.
Recommended
White Goods and Small Appliance Control
The PIC18LF27K40's CWG peripheral generates complementary PWM waveforms for small BLDC and brushed DC motor control in white goods such as washers, dishwashers, and coffee machines. The 128 KB Flash fits motor control state machines plus safety diagnostics, while the on-chip comparators implement hardware overcurrent and overtemperature shutdown. The 28-SOIC package is hand-solderable for prototyping and supports wave or reflow production soldering.
Recommended
Consumer Electronics and Wearables
The PIC18LF27K40T-I/SO is well-suited for fitness wearables, remote controls, and personal care devices where battery life, small size, and predictable real-time response matter. Its nanoWatt sleep currents extend shelf life and runtime, the wide 1.8V-3.6V supply accepts single-cell Li-ion or two AA batteries directly, and the on-chip 10-bit ADC reads battery voltage for accurate fuel-gauge reporting. The PIC18 instruction set is well documented and supported by Microchip's MPLAB X IDE.
Recommended
Recommended Products Summary
Engineering reference data for PIC18LF27K40T-I/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18LF27K40-I/SO | PIC18LF27K40T-I/ML | PIC18LF27K40-I/ML | PIC18LF26K40-I/SP | PIC18F27K40T-I/SO | PIC18LF26K42-I/SO |
|---|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SOIC (SO) | 28-SOIC (SO) - same | 28-QFN (ML) - different | 28-QFN (ML) - different | 28-SPDIP (SP) - different | 28-SOIC (SO) - same | 28-SOIC (SO) - same |
| Flash Memory | 128 KB | 128 KB | 128 KB | 128 KB | 64 KB | 128 KB | 64 KB |
| Operating Voltage | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 2.3 V to 5.5 V | 1.8 V to 3.6 V |
| Operating Frequency | 64 MHz | 64 MHz | 64 MHz | 64 MHz | 64 MHz | 64 MHz | 64 MHz |
| RAM | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB | 1 KB |
| EEPROM | 256 B | 256 B | 256 B | 256 B | 256 B | 256 B | 256 B |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
Key Differentiators
- Larger 128 KB Flash versus competitive 8-bit MCUs (vs PIC18LF26K42-I/SO)
- Wider operating voltage range when included in F variant (vs PIC18F27K40T-I/SO)
- More RAM than competitive 8-bit MCU (vs PIC18LF26K42-I/SO)
Design Notes
Place a 100 nF decoupling capacitor within 5 mm of each VDD pin (pins 7 and 20 on 28-SOIC) and a bulk 10 uF tantalum or ceramic on the main VDD rail. For ADC accuracy, also decouple AVDD separately when the analog supply is isolated. The LF variant operates from 1.8 V to 3.6 V; exceeding 3.6 V on VDD can permanently damage the part. When migrating between F and LF variants, verify that the chosen LDO output stays within the variant's supply window.
Route the ICSP/ICD signals PGC (RB6) and PGD (RB7) as short, parallel traces with a ground guard on each side to keep debug sessions stable. The 28-SOIC package's 1.27 mm pitch is hand-solderable with a fine-tip iron, but the wider 7.5 mm body still allows adequate clearance for reflow. Place the HFINTOSC-critical components away from switching power nodes; if a switching regulator is used, route its inductor away from the IC to avoid radiated noise coupling into the clock or ADC.
Do not connect MCLR directly to VDD without a pull-up; leaving MCLR floating allows noise to reset the part randomly. Tie MCLR to VDD through a 10 kohm pull-up and add a 100 nF cap to ground for noise immunity. The LF variant cannot be used in 5 V systems - confirm the supply rail before substituting with the F variant. Configuration word settings (FOSC, WDT, LVP) must be programmed in the IDE before the first firmware upload, otherwise the device may run with unintended defaults.
Compliance Information
RoHS compliant per Microchip product page. Not AEC-Q100 qualified - for automotive under-hood or safety applications, use AEC-Q100 qualified K40 variants. Industrial temperature grade -40 C to +85 C.
