PIC16LF1509-I/SO - 8-bit MCU, 14KB Flash, 20MHz | Microchip
MPN: PIC16LF1509-I/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.18 | $2.18 |
| 10 | $1.97 | $19.70 |
| 100 | $1.62 | $162.00 |
| 500 | $1.34 | $670.00 |
| 1,000 | $1.18 | $1,180.00 |
PIC16LF1509-I/SO Overview
A microcontroller (MCU) is a single-chip computer containing a CPU, non-volatile program memory, volatile data memory, and configurable peripherals. The PIC16LF family belongs to Microchip's enhanced mid-range 8-bit core architecture, sitting within the broader PIC16F product hierarchy of low-power flash microcontrollers. Its 'LF' designation indicates a wide-voltage, low-power variant designed for battery and energy-harvesting applications where every microwatt of quiescent current matters.
Key features of the PIC16LF1509 include 14KB self-programmable Flash, 512 bytes SRAM, a 10-bit ADC with up to 12 channels, two 8-bit timers, one 16-bit timer, enhanced PWM, configurable logic cells (CLC), numerically controlled oscillator (NCO) and peripheral pin select (PPS). The 'LF' suffix supports operation down to 1.8V while the F-version extends to 5.5V, giving design flexibility across lithium-cell and 5V rails. Internal oscillator calibration and on-board ICD/debug support reduce BOM cost for prototypes.
The architecture uses a Harvard RISC core with a fixed instruction set optimized for C and assembly code density. Active current is typically a few hundred microamps at 1 MHz, while sleep current drops to a few tens of nA - directly enabled by Microchip's eXtreme Low Power (XLP) technology. This makes it well-suited to duty-cycled sensor nodes.
Typical applications include IoT sensor endpoints, battery-powered home automation, low-cost motor control, LED lighting controllers, and consumer white goods. The 10-bit ADC and PPS routing simplify mixed-signal front ends where most digital I/O are reassigned dynamically.
When designing with this MCU, plan a decoupling capacitor (100 nF) adjacent to every VDD/VSS pair and keep analog AVCC traces isolated from switching nodes. For ultra-low-power sleep modes, use the PPS module to wake only the required peripherals and configure unused pins as outputs to avoid floating-input leakage.
This page consolidates distributor pricing, drop-in alternative MPNs, and design notes curated beyond the manufacturer datasheet to accelerate sourcing and prototyping decisions.
Drop-in alternatives for PIC16LF1509-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 PIC16LF1509-I/SO (same form factor and footprint) — differing in Operating Temperature, Package, ADC, I/O Pins, Program Memory (Flash).
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16F1509-I/SO
✅ Drop-In✓ In Stock
$1.34 / Unit
View Datasheet →PIC16LF1508-I/SO
✅ Drop-In✓ In Stock
$0.5 / Unit
View Datasheet →PIC16LF1507-I/SO
✅ Drop-In✓ In Stock
$0.78 / Unit
View Datasheet →PIC16F1709-I/SO
✅ Drop-In✓ In Stock
$1.38 / Unit
View Datasheet →PIC16LF1554-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16LF1509-I/SO Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC® 8-bit RISC enhanced mid-range |
| Program Memory (Flash) | 14 KB (8K x 14) |
| Data Memory (SRAM) | 512 bytes |
| Maximum CPU Speed | 20 MHz (200 ns instruction cycle) |
| I/O Pins | 18 |
| Operating Voltage Range | 1.8 V to 3.6 V (LF family) |
| ADC | 10-bit, up to 12 channels |
| DAC | 5-bit |
| Timers | 2 x 8-bit, 1 x 16-bit |
| PWM Modules | Enhanced PWM |
| Peripheral Pin Select (PPS) | Yes |
| Configurable Logic Cells (CLC) | Yes |
| Numerically Controlled Oscillator (NCO) | Yes |
| Operating Temperature | -40 C to +85 C (Industrial grade) |
| Package | 20-pin SOIC (SO), 7.50 mm body width |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Lead-Free | Yes |
PIC16LF1509-I/SO Pin Configuration
| Pin 1 | VDD — Positive power supply (1.8V to 3.6V) |
| Pin 2 | RA5 — Digital I/O / analog input / PPS |
| Pin 3 | RA4 — Digital I/O / analog input / PPS |
| Pin 4 | RA3/MCLR/VPP — Digital I/O / Master Clear (reset) / programming voltage |
| Pin 5 | RC5 — Digital I/O / analog input / PPS |
| Pin 6 | RC4 — Digital I/O / analog input / PPS |
| Pin 7 | RC3 — Digital I/O / analog input / PPS / SCL |
| Pin 8 | RC2 — Digital I/O / analog input / PPS |
| Pin 9 | RC1 — Digital I/O / analog input / PPS / SDA |
| Pin 10 | RC0 — Digital I/O / analog input / PPS |
| Pin 11 | RA2 — Digital I/O / analog input / PPS / DAC output |
| Pin 12 | RA1 — Digital I/O / analog input / PPS / DAC reference |
| Pin 13 | RA0 — Digital I/O / analog input / PPS |
| Pin 14 | VSS — Ground reference |
| Pin 15 | RA7 — Digital I/O / analog input / PPS / CLKIN |
| Pin 16 | RA6 — Digital I/O / analog input / PPS / CLKOUT |
| Pin 17 | RC7 — Digital I/O / analog input / PPS |
| Pin 18 | RC6 — Digital I/O / analog input / PPS |
| Pin 19 | RB7 — Digital I/O / analog input / PPS |
| Pin 20 | RB6 — Digital I/O / analog input / PPS / ICD PGC |
Typical Applications
PIC16LF1509-I/SO is suitable for 6 applications: Battery-Powered IoT Sensor Nodes, Home Automation and Smart Lighting, Low-Cost Motor Control, Consumer White Goods and Appliances, LED Lighting Drivers and Controllers, Industrial Sensor Conditioning.
Battery-Powered IoT Sensor Nodes
The PIC16LF1509-I/SO is purpose-built for IoT sensor endpoints where microamp sleep currents and small footprints determine battery life. Its 1.8 V minimum supply lets it run directly from a single CR2032 coin cell or two AA batteries, while the 14KB Flash and 512B RAM support BLE/Zigbee-ready sensor stacks and Modbus-like protocols. The 10-bit ADC with up to 12 channels handles temperature, humidity, and voltage monitoring without external converters. The XLP sleep current (tens of nA) extends battery life to multi-year levels when duty-cycled correctly. Designers should configure PPS to wake only required peripherals and use the CLC module for hardware event gating to maximize power efficiency.
Recommended
Home Automation and Smart Lighting
In home automation hubs and smart lighting controllers, the PIC16LF1509-I/SO delivers the right balance of GPIO count, ADC channels, and PWM outputs. The 18 I/O pins handle multiple switch inputs, dimmer outputs, and LED driver controls, while enhanced PWM modules support smooth dimming curves. The peripheral pin select (PPS) feature remaps peripherals dynamically, simplifying PCB routing in space-constrained wall switches. Designers benefit from the 1.8V-3.6V supply range which accepts direct 3.3V rails and supports battery-backed wireless sensor pairs in the same BOM.
Recommended
Low-Cost Motor Control
Small DC and stepper motor controllers in appliances and consumer products leverage the PIC16LF1509-I/SO's enhanced PWM and 16-bit timer for precise commutation. The 10-bit ADC samples current-sense amplifiers for closed-loop torque control, while the configurable logic cells (CLC) handle hardware commutation events without CPU intervention. The NCO module generates precise frequency outputs for stepper microstepping applications. The 20-pin SOIC package keeps cost low while providing adequate thermal performance for hobby robotics and small appliance designs under 500 mA drive currents.
Recommended
Consumer White Goods and Appliances
The PIC16LF1509-I/SO suits cost-sensitive consumer appliances like coffee makers, microwave ovens, and washing machine control panels. Its industrial temperature range (-40C to +85C) handles appliance environments, while 14KB Flash supports HMI state machines, fault detection, and EEPROM emulation routines. The 10-bit ADC reads keypads via resistive ladder and monitors NTC thermistors for safety shutdown. Designers use the peripheral pin select feature to optimize PCB layout when the MCU straddles display and power sections in split-board designs typical of home appliances.
Recommended
LED Lighting Drivers and Controllers
Architectural and signage LED lighting benefits from the PIC16LF1509-I/SO's multiple PWM channels and configurable logic cells. Each PWM channel drives a separate LED string via constant-current drivers, while the CLC module combines PWM signals for RGB color mixing without CPU overhead. The 5-bit DAC generates analog reference voltages for current control loops, and the ADC monitors LED temperature via thermistors for thermal protection. The XLP features extend battery life in solar-powered landscape lighting fixtures where energy budget is critical.
Recommended
Industrial Sensor Conditioning
The PIC16LF1509-I/SO excels in industrial 4-20 mA sensor transmitters and bridge-sensor signal conditioners. Its 10-bit ADC digitizes conditioned analog signals from strain gauges, pressure sensors, and RTDs, while the 5-bit DAC generates precision excitation voltages. The peripheral pin select allows designers to map SPI I/O for isolated digital outputs in hazardous-area applications. The wide -40C to +85C industrial temperature range ensures operation in factory floors and outdoor installations. The 20-SOIC package handles conformal coating and potting required for IP-rated industrial sensors.
Recommended
Recommended Products Summary
Engineering reference data for PIC16LF1509-I/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16F1509-I/SO | PIC16LF1508-I/SO | PIC16LF1507-I/SO | PIC16F1709-I/SO | PIC16LF1554-I/SO |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 20-SOIC | 20-SOIC - same | 20-SOIC - same | 20-SOIC - same | 20-SOIC - same | 20-SOIC - same |
| Program Memory (Flash) | 14 KB | 14 KB | 7 KB | 14 KB | 8 KB | 7 KB |
| Data Memory (SRAM) | 512 B | 512 B | 256 B | 256 B | 1 KB | 256 B |
| Maximum Clock Speed | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Operating Voltage Range | 1.8 V to 3.6 V | 1.8 V to 5.5 V | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 1.8 V to 5.5 V | 1.8 V to 3.6 V |
| I/O Pins | 18 | 18 | 17 | 18 | 18 | 17 |
| ADC Resolution | 10-bit | 10-bit | 10-bit | 10-bit | 10-bit | 10-bit |
Key Differentiators
- Ultra-low-power (XLP) sleep current in tens of nA (vs PIC16F1509-I/SO)
- 14KB Flash and 512B RAM (vs PIC16LF1508-I/SO)
- Peripheral Pin Select (PPS) flexibility (vs PIC16LF1507-I/SO)
Design Notes
Place a 100 nF decoupling capacitor as close as possible to the VDD pin (pin 1) and another 100 nF near VSS (pin 14) to suppress switching noise. For battery-powered designs, add a 10 uF bulk capacitor at the VDD rail to handle peak current transients from peripherals and ADC sampling events. The XLP technology enables sleep currents below 50 nA when properly configured.
Keep analog input traces short and isolated from digital switching signals. Use a ground plane under the MCU to reduce EMI susceptibility. Place the ICSP programming header (PGD/PGC on RB7/RB6) at the board edge for in-circuit debug access without disassembling the product. Route the MCLR pin through a 10 kohm pull-up resistor to VDD for reliable reset behavior.
Do not exceed the 3.6 V maximum supply voltage on the LF variant - the standard F version (PIC16F1509) is required for 5V systems. Configure all unused I/O pins as outputs with low state to avoid floating-input leakage currents that can degrade sleep-mode performance by several microamps per pin. The 5-bit DAC output reference must be enabled in software before use; leaving it floating can introduce noise on adjacent analog inputs.
Compliance Information
RoHS and lead-free per Microchip product page; not AEC-Q100 qualified (industrial grade only). For automotive applications, consider PIC16F1509-E/SO automotive variants.
