PIC18LF25K40T-I/SS - 8-Bit XLP MCU, 32KB Flash, 28-SSOP
MPN: PIC18LF25K40T-I/SS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.85 | $2.85 |
| 10 | $2.5 | $25.00 |
| 100 | $2.18 | $218.00 |
| 500 | $1.95 | $975.00 |
| 1,000 | $1.72 | $1,720.00 |
PIC18LF25K40T-I/SS Overview
An 8-bit microcontroller is a programmable logic device built around an 8-bit data bus, typically used in cost-sensitive embedded applications where arithmetic performance requirements are modest but peripheral integration, low power, and deterministic I/O matter more than raw compute throughput. Within the broader embedded taxonomy, the PIC18LF25K40 sits in the PIC18 family -> 8-bit MCU category -> microcontroller -> embedded processing -> semiconductor hierarchy. The XLP technology used in this part is Microchip's branding for a set of ultra-low-power architectural features (nanoWatt XLP sleep modes, low-power Run modes, and ultra-low-power wake-up sources) targeting battery-powered designs.
Key features distinguishing this part include the ADCC with automated Capacitive Voltage Divider (CVD) support for advanced touch sensing, 36 instructions in the PIC18 instruction set, hardware CRC/SCAN for memory integrity checking, and the Peripheral Pin Select (PPS) module that allows flexible remapping of digital peripherals to I/O pins. The 28-SSOP package is approximately 7.8mm wide with a 0.65mm pitch, well-suited for hand-solderable and reflow-compatible designs.
Architecturally, the PIC18LF25K40 uses a Harvard architecture with separate program and data buses, an 8-level hardware stack, and a Multiply-Lookup table accelerator for math-intensive operations. The internal 64MHz oscillator is paired with a 16MHz instruction-cycle rate (4:1 divider), and the integrated high-speed ADC can reach up to 200ksps in 10-bit mode, enabling low-latency sensor sampling. The XLP sleep modes consume down to low nA range currents, depending on configuration - making this MCU well-suited for energy harvesting applications.
Typical applications include IoT sensor nodes, battery-powered touch interfaces, industrial control panels with CAN/eight analog inputs, low-power medical wearables, and home automation controllers. The wide 1.8V-3.6V operating range makes the part particularly suitable for direct connection to single-cell lithium or multi-cell alkaline battery stacks without a boost regulator.
When designing with this MCU, ensure the ICSP/PGD/PGC programming interface is correctly routed and that the MCLR pin has a proper pull-up to VDD for reliable reset behavior. Note that SSOP packages have moderate thermal dissipation characteristics; for designs running near 64MHz continuously, verify junction temperature under load.
Drop-in alternatives for PIC18LF25K40T-I/SS — 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 PIC18LF25K40T-I/SS (same form factor and footprint) — differing in ADC, Package, DAC, Core, Program Memory (Flash).
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F25K40-I/SS
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View Datasheet →PIC18LF25K40-I/SS
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View Datasheet →PIC18LF24K40-I/SS
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View Datasheet →PIC18LF25K42-I/SS
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View Datasheet →PIC18LF25K40T-I/SO
✅ Drop-In✓ In Stock
$1.55 / Unit
View Datasheet →PIC18LF25K40T-I/SS Maximum Ratings & Electrical Characteristics
| Family | PIC18 XLP |
| Core | PIC18, 8-bit |
| Program Memory Type | Flash |
| Program Memory Size | 32 KB (16K x 16) |
| RAM Size | 2 KB |
| EEPROM Size | 256 bytes |
| Maximum CPU Speed | 64 MHz (16 MIPS) |
| Supply Voltage (Vdd) | 1.8 V to 3.6 V |
| ADC | 10-bit ADC with Computation (ADCC), up to 200 ksps |
| DAC | 5-bit DAC |
| Comparators | Yes (with CVD support) |
| PWM / CCP | PWM, CCP, CWG |
| Timers | HLT, WWDT, SCAN/CRC, ZCD |
| Operating Temperature | -40C to +85C (Industrial) |
| Package | 28-SSOP |
| Mounting Type | Surface Mount |
| MSL Level | MSL3 (per JEDEC J-STD-020) |
| RoHS Status | Compliant |
PIC18LF25K40T-I/SS Pin Configuration
| Pin 1 | MCLR#/Vpp/RE3 — Master Clear reset (active-low) or programming voltage; input-only pin |
| Pin 2 | RA0/AN0 — PORTA bit 0 / analog input 0 |
| Pin 3 | RA1/AN1 — PORTA bit 1 / analog input 1 |
| Pin 4 | RA2/AN2 — PORTA bit 2 / analog input 2 |
| Pin 5 | RA3/AN3 — PORTA bit 3 / analog input 3 / Vref+ |
| Pin 6 | RA4/AN4 — PORTA bit 4 / analog input 4 |
| Pin 7 | RA5/AN5 — PORTA bit 5 / analog input 5 / Vref- |
| Pin 8 | Vss — Ground reference |
| Pin 9 | RA7/OSC1 — PORTA bit 7 / oscillator input |
| Pin 10 | RA6/OSC2 — PORTA bit 6 / oscillator output |
| Pin 11 | RC0 — PORTC bit 0 |
| Pin 12 | RC1 — PORTC bit 1 |
| Pin 13 | RC2 — PORTC bit 2 |
| Pin 14 | RC3 — PORTC bit 3 |
| Pin 15 | RC4 — PORTC bit 4 / I2C SDA |
| Pin 16 | RC5 — PORTC bit 5 |
| Pin 17 | RC6 — PORTC bit 6 / UART TX |
| Pin 18 | RC7 — PORTC bit 7 / UART RX |
| Pin 19 | Vss — Ground reference |
| Pin 20 | Vdd — Positive supply (1.8V-3.6V) |
| Pin 21 | RB0/INT — PORTB bit 0 / external interrupt |
| Pin 22 | RB1 — PORTB bit 1 |
| Pin 23 | RB2 — PORTB bit 2 |
| Pin 24 | RB3 — PORTB bit 3 |
| 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
PIC18LF25K40T-I/SS is suitable for 6 applications: IoT Wireless Sensor Node, Capacitive Touch User Interface, Industrial Control Panel MCU, Battery-Powered Medical Wearable, Smart Home Sensor Hub, Automotive Accessory MCU.
IoT Wireless Sensor Node
The PIC18LF25K40T-I/SS fits battery-powered IoT sensor nodes because its nanoWatt XLP sleep modes drop quiescent current into the nanoampere range while still allowing wake-on-interrupt from the integrated analog comparators and ADCC. The 1.8V-3.6V supply range supports direct operation from a single-cell Li-ion or two-cell alkaline stack without a boost converter, and the 32KB Flash comfortably holds LoRaWAN/MQTT-SN stacks alongside sensor drivers. Real-world deployments reach years of operating life on a single CR2032 coin cell when carefully duty-cycled.
Recommended
Capacitive Touch User Interface
The PIC18LF25K40T-I/SS is well matched to capacitive touch interfaces because the 10-bit ADCC with Computation (ADCC) automates Capacitive Voltage Divider (CVD) measurements on standard digital I/O pins, replacing a dedicated touch IC. With ~23 I/O available and Peripheral Pin Select flexibility, a 28-SSOP board can scan 12-16 touch electrodes, drive indicator LEDs via the 5-bit DAC, and run UI firmware in 32KB Flash. mTouch code examples cut firmware time to minutes.
Recommended
Industrial Control Panel MCU
Industrial control panels benefit from the PIC18LF25K40T-I/SS because its integrated peripheral set (PWM, CCP, CWG, comparators, ZCD) covers motor drivers, triac/SSRs, and analog front-ends without external glue logic. The SCAN/CRC peripheral performs periodic memory integrity checks to support IEC 61508 SIL-class firmware reliability requirements, and the -40C to +85C industrial grade supports factory-floor temperatures. Designers pair the part with isolated I/O and CAN/LIN UARTs for full machine control.
Recommended
Battery-Powered Medical Wearable
Low-power medical wearables such as pulse oximeters, continuous glucose monitors, and patient thermometers favor the PIC18LF25K40T-I/SS for its combination of XLP sleep current (down to the nanoampere range), 10-bit ADCC for sensor readout, and on-chip peripherals that reduce external BOM. The 1.8V-3.6V supply accepts a single Li-ion/polymer cell directly, the 16 MIPS headroom handles DSP-style filtering for signal conditioning, and the small 28-SSOP footprint (~7.8mm x 5.3mm) suits wrist-worn designs.
Recommended
Smart Home Sensor Hub
Smart home products (motion sensors, door/window contacts, occupancy detectors) deploy the PIC18LF25K40T-I/SS because XLP nanoWatt sleep drops current below the self-discharge rate of coin cells, while the 10-bit ADCC and integrated ZCD (Zero-Cross Detector) simplify AC-line sensing and PIR/pyroelectric front-end interfaces. The 32KB Flash hosts MiHome/Zigbee/Thread node stacks, and the 256B EEPROM stores calibration data and security keys.
Recommended
Automotive Accessory MCU
In automotive accessories (cabin lighting, sensor-equipped phone holders, USB chargers with telemetry), the PIC18LF25K40T-I/SS provides robust peripheral integration and -40C to +85C industrial operating temperature at lower cost than full AEC-Q100 parts. For non-safety accessories, the ADC/PWM/CCP peripheral set covers PWM dimming, voltage/current sensing, and serial LEDs (WS2812). For safety roles (airbag, brake-light controllers), select the AEC-Q100 qualified PIC18F25Q43-I/SS instead.
Recommended
Recommended Products Summary
Engineering reference data for PIC18LF25K40T-I/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F25K40-I/SS | PIC18LF25K40-I/SS | PIC18LF24K40-I/SS | PIC18LF25K42-I/SS |
|---|---|---|---|---|---|
| Package | 28-SSOP (0.65mm pitch) | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same |
| Brand | Microchip Technology | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same |
| Flash Memory | 32 KB | 32 KB | 32 KB | 16 KB | 64 KB |
| RAM | 2 KB | 2 KB | 2 KB | 2 KB | 4 KB |
| Supply Voltage Range | 1.8V - 3.6V (LF) | 2.3V - 5.5V (F) | 1.8V - 3.6V (LF) | 1.8V - 3.6V (LF) | 1.8V - 3.6V (LF) |
| Maximum Clock | 64 MHz / 16 MIPS | 64 MHz / 16 MIPS | 64 MHz / 16 MIPS | 64 MHz / 16 MIPS | 64 MHz / 16 MIPS |
| ADC | 10-bit ADCC, up to 200 ksps | 10-bit ADCC, up to 200 ksps | 10-bit ADCC, up to 200 ksps | 10-bit ADCC, up to 200 ksps | 10-bit ADCC, up to 200 ksps |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) |
Key Differentiators
- ADCC with CVD hardware simplifies capacitive touch (vs PIC18LF24K40-I/SS)
- K42 upgrade doubles Flash and RAM (vs PIC18LF25K42-I/SS)
- Wide LF voltage range 1.8V-3.6V (vs PIC18F25K40-I/SS)
- Integrated CWG and ZCD reduce BOM (vs PIC18F25K22-I/SO)
Design Notes
Estimated: at 64MHz CPU and 3.3V supply, active current is approximately 13 mA for the PIC18LF25K40. In sleep mode (XLP), current drops to roughly 50-100 nA. For battery-operated designs, duty-cycle the MCU aggressively, exploiting the integrated ADC and comparators for sensor sampling while CPU is asleep.
Place a 100nF decoupling capacitor as close as possible to the Vdd pin (pin 20) and a 10uF bulk capacitor at the board supply input. For SSOP-28 layouts, use a guard ground trace between the ICSP PGC/PGD pins and surrounding analog signals to reduce noise injection during programming and runtime debugging.
Do not exceed the absolute maximum Vdd of 4.0V; the LF variant permanently damages if exposed to a 5V supply. Always add a series resistor on MCLR# for in-circuit programming isolation, and configure PPS (Peripheral Pin Select) carefully - misconfiguration is a common source of 'dead' GPIOs that fail to respond on first prototypes.
When routing the 32.768kHz low-power crystal for the secondary LP oscillator, keep traces short (<5mm) and surround with a ground pour to minimize capacitive loading. Incorrect crystal layout is a leading cause of RTC drift or oscillator startup failure in PIC18LF25K40 designs.
Compliance Information
RoHS and REACH compliant per Microchip product page. Industrial temperature grade -40C to +85C; for AEC-Q100 automotive requirements, select PIC18F25Q43-I/SS instead. Pb-free reflow profile per J-STD-020.
