PIC16LF1503-E/SL - 8-bit MCU, 3.5KB Flash, 20MHz, 14-SOIC | Microchip
MPN: PIC16LF1503-E/SL ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.16 | $1.16 |
| 10 | $1.04 | $10.40 |
| 100 | $0.83 | $83.00 |
| 500 | $0.71 | $355.00 |
| 1,000 | $0.62 | $620.00 |
PIC16LF1503-E/SL Overview
What is a PIC microcontroller? A PIC (Peripheral Interface Controller) is a family of 8-/16-/32-bit RISC microcontrollers from Microchip that combine a CPU core, program memory (Flash/ROM), data memory (RAM/EEPROM), and on-chip peripherals (ADC, timers, PWM, communication ports) in a single chip. Within that hierarchy PIC16F sits in the mid-range tier, above baseline PIC10/12/14 and below PIC18/dsPIC, balancing cost, peripheral integration, and code efficiency. The PIC16LF1503 specifically belongs to the PIC16F1503 family, which adds the Configurable Logic Cell (CLC), Complementary Waveform Generator (CWG), and Numerically Controlled Oscillator (NCO) peripherals.
Key features include 12 I/O pins, a 10-bit ADC with up to 8 channels, two 8-bit timers and one 16-bit timer, PWM modules, an EUSART, and an I2C/SPI MSSP peripheral. Self-programmability is supported under software control via In-Circuit Serial Programming (ICSP), enabling bootloader-based field updates. Programmable Low-Power Brown-out Reset (LPBOR) and a programmable Watchdog Timer (WDT) from 1 ms to 256 s round out the safety chain.
Typical applications include low-power IoT sensor nodes, consumer appliance controls, LED lighting controllers, battery-powered handheld instruments, and automotive body/comfort subsystems (where the E temperature grade qualifies). With XLP technology drawing sub-uA sleep currents, the LF1503 is favored where coin-cell or lithium-thionyl-chloride cells must run for years.
When designing with this part, mind the LF vs F distinction: the LF requires 1.8-3.6V, while the F variant supports 2.3-5.5V. Choose LF for ultra-low-power; choose F if you need 5V tolerance on logic rails. Decouple VDD with at least 0.1 uF ceramic close to the pin and keep ICSP traces short.
This page synthesizes distributor pricing, drop-in 14-SOIC alternatives, and practical design notes not found in the bare datasheet, helping engineers short-list replacements in seconds.
Drop-in alternatives for PIC16LF1503-E/SL — 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 PIC16LF1503-E/SL (same form factor and footprint) — differing in ADC, Mounting Type, Package, Core Architecture, Operating Temperature.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16LF1503-I/SL
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16LF1503T-I/SL
✅ Drop-In✓ In Stock
$0.74 / Unit
View Datasheet →PIC16F1503-I/SL
✅ Drop-In✓ In Stock
$0.59 / Unit
View Datasheet →PIC16F1503-E/SL
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16LF1703-I/SL
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC16F15214-I/SL
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC16LF1503-E/SL Maximum Ratings & Electrical Characteristics
| Core | PIC16 enhanced mid-range 8-bit RISC |
| Program Memory (Flash) | 3.5 KB (2K x 14 words) |
| Data Memory (RAM) | 128 bytes |
| Maximum CPU Speed | 20 MHz |
| Operating Voltage Range | 1.8 V to 3.6 V (LF variant) |
| I/O Pins | 12 |
| ADC | 10-bit, up to 8 channels |
| Timers | Two 8-bit, one 16-bit |
| Communication Peripherals | EUSART, MSSP (I2C/SPI) |
| Special Peripherals | CLC, CWG, NCO |
| Self-Programming | Yes (ICSP) |
| Watchdog Timer | Programmable 1 ms to 256 s |
| Brown-out Reset | Programmable LPBOR + POR |
| Operating Temperature | -40 C to +125 C (E grade) |
| Package | 14-pin SOIC (SL) |
| Mounting Type | Surface Mount (Gull Wing) |
| RoHS Status | Compliant |
PIC16LF1503-E/SL Pin Configuration
| Pin 1 | VDD — Positive power supply (1.8V to 3.6V) |
| Pin 2 | RA5 — Digital I/O, analog channel |
| Pin 3 | RA4 — Digital I/O with weak pull-up |
| Pin 4 | RA3/MCLR/VPP — Digital input / Master Clear reset (active low) / ICSP programming voltage |
| Pin 5 | RC5 — Digital I/O, analog channel |
| Pin 6 | RC4 — Digital I/O, analog channel |
| Pin 7 | RC3 — Digital I/O, analog channel |
| Pin 8 | RC2 — Digital I/O, analog channel |
| Pin 9 | RC1 — Digital I/O, analog channel |
| Pin 10 | RC0 — Digital I/O, analog channel |
| Pin 11 | RA2 — Digital I/O, analog channel |
| Pin 12 | RA1/ICSPDAT — Digital I/O / ICSP data |
| Pin 13 | RA0/ICSPCLK — Digital I/O / ICSP clock |
| Pin 14 | VSS — Ground reference |
Typical Applications
PIC16LF1503-E/SL is suitable for 7 applications: Battery-Powered IoT Sensor Node, Consumer Appliance Control Board, LED Lighting Controller, Automotive Body and Comfort Module, Industrial Sensor Transmitter, Handheld Battery Test Instrument, Smart Home Wireless Sensor (Sub-GHz/Zigbee Bridge).
Battery-Powered IoT Sensor Node
The PIC16LF1503-E/SL is well suited to battery-powered IoT sensor nodes that must run for years on a coin-cell or lithium primary cell. Its 1.8 V minimum VDD extracts the last coulomb from depleted cells, while the nanoWatt XLP sleep mode draws sub-microamp currents between ADC conversions. The 10-bit ADC with 8 channels multiplexes temperature, humidity, and battery-voltage sensors through a single MCU, and the 3.5 KB Flash holds a small Modbus RTU or proprietary protocol stack. Unlike higher-pin-count Cortex-M parts, this 14-SOIC device keeps the BOM under a dollar, enabling disposable or single-use IoT endpoints.
Recommended
Consumer Appliance Control Board
In consumer appliance controls such as coffee makers, air purifiers, or simple white-goods HMI boards, the PIC16LF1503-E/SL drives keypads, LED indicators, and triac-fired loads. The CLC (Configurable Logic Cell) implements glue logic like latch-and-debounce or PWM-and-and-combinations in hardware, eliminating external 74-series gates. The CWG (Complementary Waveform Generator) produces dead-band-controlled complementary PWM for half-bridge motor or MOSFET driver stages without software jitter. E-grade -40 to +125 C support survives the heat of enclosed adapters and motor housings.
Recommended
LED Lighting Controller
The PIC16LF1503-E/SL serves as a low-cost dimming controller in LED lamps and downlights, where the CWG and NCO peripherals synthesize precise PWM or pulse-density modulated waveforms for analog dimming. The 10-bit ADC reads ambient-light sensors or 0-10 V dimmer inputs, while the EUSART links to wireless modules for Zigbee or Bluetooth Mesh gateways. The -40 to +125 C operating range tolerates the thermal environment inside enclosed LED fixtures where driver electronics share space with the LED heat sink, ensuring long lumen-maintenance life.
Recommended
Automotive Body and Comfort Module
Thanks to its -40 C to +125 C operating range, the PIC16LF1503-E/SL fits non-safety automotive body and comfort subsystems such as ambient lighting controllers, seat-position switches, or HVAC flap drivers. Its small 14-SOIC footprint eases integration behind trim panels, and the 1.8-3.6 V LF supply rail connects directly to post-regulator automotive 3.3 V nodes. While not AEC-Q100 qualified, the E-grade thermal margin and Microchip's automotive-quality pedigree make it acceptable for many non-safety body nodes in OEM programs.
Recommended
Industrial Sensor Transmitter
The PIC16LF1503-E/SL operates as the MCU core of a 4-20 mA or 0-10 V industrial sensor transmitter, digitizing a bridge or thermocouple input with its 10-bit ADC and conditioning the output through the EUSART or MSSP. The 20 MHz core runs simple linearization algorithms, and the E temperature grade tolerates -40 to +125 C field cabinets. The CLC peripheral handles HART or other FSK modulation patterns in hardware, freeing CPU cycles for measurement scaling and diagnostics reporting back to PLCs.
Recommended
Handheld Battery Test Instrument
Portable battery-test instruments and handheld multimeters benefit from the PIC16LF1503-E/SL's ultra-low sleep current and 14-SOIC compactness, which fits inside AA-battery compartments. The MCU wakes on button press, takes a 10-bit ADC measurement of the battery under test, and displays the result on a small LCD or LED bar via GPIO. With the LF variant operating down to 1.8 V, the device continues to give meaningful readings even as its own primary cell voltage sags toward end-of-life, maximizing user-visible battery life.
Recommended
Smart Home Wireless Sensor (Sub-GHz/Zigbee Bridge)
In a smart-home wireless sensor bridge, the PIC16LF1503-E/SL acts as a low-power host MCU to a sub-GHz transceiver or Zigbee front-end module. The EUSART runs at up to 1 Mbps to communicate with the radio while the MSSP drives a local SPI sensor cluster. The 12 available I/O pins expose enough GPIOs for wake-on-interrupt from PIR or magnetic reed switches, and XLP sleep currents in the hundreds of nanoamps enable multi-year battery life on door/window sensors that spend 99 percent of their time asleep.
Recommended
Recommended Products Summary
Engineering reference data for PIC16LF1503-E/SL — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16LF1503-I/SL | PIC16LF1503T-I/SL | PIC16F1503-I/SL | PIC16F1503-E/SL | PIC16LF1703-I/SL |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 14-SOIC (SL) | 14-SOIC (SL) - same | 14-SOIC (SL) - same | 14-SOIC (SL) - same | 14-SOIC (SL) - same | 14-SOIC (SL) - same |
| Operating Voltage | 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 | 2.3 V to 5.5 V | 1.8 V to 3.6 V |
| Flash Memory | 3.5 KB | 3.5 KB | 3.5 KB | 3.5 KB | 3.5 KB | 7 KB (+100%) |
| RAM | 128 B | 128 B | 128 B | 128 B | 128 B | 256 B (+100%) |
| Maximum Clock | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Operating Temperature | -40 C to +125 C (E) | -40 C to +85 C (I) | -40 C to +85 C (I) | -40 C to +85 C (I) | -40 C to +125 C (E) | -40 C to +85 C (I) |
| I/O Pins | 12 | 12 | 12 | 12 | 12 | 12 |
| ADC | 10-bit, 8 channels | 10-bit, 8 channels | 10-bit, 8 channels | 10-bit, 8 channels | 10-bit, 8 channels | 10-bit, 8 channels + DAC |
| Special Peripherals | CLC, CWG, NCO | CLC, CWG, NCO | CLC, CWG, NCO | CLC, CWG, NCO | CLC, CWG, NCO | CLC, CWG, NCO + op-amps + DAC |
Key Differentiators
- Lowest minimum VDD in its class with full peripheral set (vs PIC16F1503-I/SL)
- Wider operating temperature range for harsh environments (vs PIC16LF1503-I/SL)
- Higher on-chip Flash and RAM with same package (vs PIC16LF1703-I/SL)
Design Notes
The PIC16LF1503-E/SL LF variant operates from 1.8 V to 3.6 V. Decouple VDD (pin 1) with a 100 nF ceramic capacitor placed within 3 mm of the pin, and add a bulk 1-10 uF tantalum or ceramic if the supply rail is shared with switching converters. Place a 100 nF cap close to VSS (pin 14) as well. For battery designs, leverage the nanoWatt XLP sleep modes - draw paths from VDD through any pull-ups should be minimized since leakage quickly exceeds the MCU's sleep current.
Do not confuse the LF1503 with the F1503: the LF minimum VDD is 1.8 V while the F requires 2.3 V. Programming voltage on MCLR/VPP must not exceed VDD + 0.3 V. The ICSP pins (RA0/ICSPCLK and RA1/ICSPDAT) must not be left floating during programming - 10 kohm pull-ups on RA0/RA1 to VDD avoid contention with the ICD tool. Ensure RA3/MCLR has a 10-50 kohm pull-up to VDD unless external reset is intentionally driven low.
For 14-SOIC layout, use a ground pour under the IC body to provide thermal spreading and EMI shielding, with thermal vias stitched at 200-mil pitch around the pour. Keep the ICSP traces (RA0/RA1/RA3/MCLR) short and away from switching nodes to avoid programming glitches. The crystal/oscillator traces (if using external clock on RA4/RA5) must be guarded by ground on both sides and kept under 5 mm length to prevent ringing.
When the MSSP is used in SPI mode at high speeds (> 4 MHz), add 33 ohm series resistors near the MCU pins to dampen reflections on the SCK/MOSI lines. For I2C bus, the PIC16LF1503-E/SL does not include internal I2C pull-ups - external 4.7 kohm pull-ups to VDD are mandatory on SCL/SDA lines. SMBus voltage-level compatibility is ensured as long as VDD is within 1.8-3.6 V and pull-ups are referenced to the same VDD rail.
Estimated: At maximum 20 MHz CPU clock and 3.6 V VDD with all peripherals active, the LF1503 draws ~ 6 mA, dissipating ~ 22 mW in the 14-SOIC. Thermal resistance theta_JA for SOIC-14 is approximately 100 C/W per JEDEC EIA/JESD51 standards, yielding a junction-to-ambient rise of only ~ 2.2 C - well within the -40 C to +125 C operating window. For enclosed designs with limited airflow, derate by 30 percent when computing long-term reliability margins.
Compliance Information
RoHS and REACH compliant per Microchip product declaration; not AEC-Q100 qualified - the 'E' suffix denotes -40C to +125C operating temperature only, not automotive qualification. For AEC-Q100 needs, choose dsPIC33CK256MP205-I/PT or other Q-graded parts.
