PIC16LC72-04I/SS - 8-bit 4MHz MCU, 3.5KB OTP, 28-SSOP | Microchip
MPN: PIC16LC72-04I/SS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.1 | $4.10 |
| 10 | $3.78 | $37.80 |
| 100 | $3.25 | $325.00 |
| 500 | $2.95 | $1,475.00 |
| 1,000 | $2.72 | $2,720.00 |
PIC16LC72-04I/SS Overview
A microcontroller (MCU) is a single-chip computer containing a CPU, memory, and peripherals. Within the PIC family, the PIC16LC72 belongs to the mid-range architecture, which uses a 14-bit instruction word and Harvard memory structure. Low-dropout CMOS variants (LC) operate over an extended voltage range, making them appropriate for power-constrained embedded systems. In the broader hierarchy, an MCU falls under microcontrollers, then integrated circuits, then semiconductors.
Key features of the PIC16LC72-04I/SS include an industrial temperature grade (-40C to +85C), three timer/counter blocks (8-bit Timer0 with prescaler, 16-bit Timer1 with sleep-mode crystal increment capability, 8-bit Timer2), and synchronous serial port (SSP) supporting both SPI and I2C. Program memory is OTP (one-time programmable), which is suitable for high-volume production where firmware is fixed and code updates are not expected in the field.
The device uses Microchip's classic PIC RISC architecture with a small instruction set and deterministic timing. The integrated 8-bit ADC allows direct interfacing with analog sensors (temperature, light, voltage), while the I2C/SPI peripherals enable communication with external EEPROMs, sensors, and displays. The PIC16LC72 is widely used in legacy and cost-sensitive designs, including automotive subsystems, consumer appliances, and industrial control.
Typical applications for the PIC16LC72-04I/SS include low-power remote sensor nodes, white goods and home appliance motor drivers, HVAC control modules, automotive interior lighting controllers, and simple industrial timer/counter subsystems. The industrial temperature grade allows use in non-extreme factory environments.
When designing with this part, note that the OTP program memory means firmware cannot be field-updated. Engineers should use a flash-based sibling (such as the PIC16F72 family) during development and prototyping, then transition to the PIC16LC72-04I/SS for cost-optimized production. Ensure decoupling capacitors are placed close to VDD/VSS pins and that MCLR is properly biased for reliable resets.
Drop-in alternatives for PIC16LC72-04I/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 PIC16LC72-04I/SS (same form factor and footprint) — differing in Package, Timers, Operating Temperature, ADC, Watchdog Timer.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16LC72-04I/SP
✅ Drop-In✓ In Stock
$4.64 / Unit
View Datasheet →PIC16LC72I-04/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16LC711-04I/SO
✅ Drop-In✓ In Stock
$3.78 / Unit
View Datasheet →PIC16LC711-04/SO
✅ Drop-In✓ In Stock
$1.85 / Unit
View Datasheet →PIC16LC558T-04/SO
✅ Drop-In✓ In Stock
$2.65 / Unit
View Datasheet →PIC16LC558-04I/SO
✅ Drop-In✓ In Stock
$1.1 / Unit
View Datasheet →PIC16LC72-04I/SS Maximum Ratings & Electrical Characteristics
| Manufacturer | Microchip Technology |
| Series | PIC16LC72 |
| Core Processor | PIC |
| Core Size | 8-bit |
| Program Memory Size | 3.5 KB (2K x 14) |
| Program Memory Type | OTP (One-Time Programmable) |
| RAM Size | 128 x 8 bytes |
| Maximum Clock Frequency | 4 MHz |
| Number of I/O Pins | 22 |
| Supply Voltage Range | 2.5 V to 5.5 V |
| A/D Converter | 8-bit, 5 channels |
| Connectivity | I2C, SPI |
| Timers | Timer0 (8-bit), Timer1 (16-bit), Timer2 (8-bit) |
| Operating Temperature | -40C to +85C (Industrial) |
| Package | 28-SSOP (0.209 inch / 5.30mm width) |
| Mounting Type | Surface Mount |
| Terminal Form | GULL WING |
| Architecture | RISC, Harvard, Mid-Range |
PIC16LC72-04I/SS Pin Configuration
| Pin 1 | MCLR — Master Clear (Reset) input, active low |
| 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/VREF — PORTA bit 3 / Analog input 3 / Voltage Reference |
| Pin 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Pin 7 | RA5/AN4/SS — PORTA bit 5 / Analog input 4 / SPI Slave Select |
| Pin 8 | RE0/RD — PORTE bit 0 / Read control (parallel slave port) |
| Pin 9 | OSC1/CLKIN — Oscillator crystal input / external clock input |
| Pin 10 | OSC2/CLKOUT — Oscillator crystal output / clock output |
| Pin 11 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| Pin 12 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / Capture/Compare/PWM 2 |
| Pin 13 | RC2/CCP1 — PORTC bit 2 / Capture/Compare/PWM 1 |
| Pin 14 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Pin 15 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Pin 16 | RC5/SDO — PORTC bit 5 / SPI data out |
| Pin 17 | RC6 — PORTC bit 6 |
| Pin 18 | RC7 — PORTC bit 7 |
| Pin 19 | VSS — Ground reference |
| Pin 20 | VDD — Positive supply voltage |
| Pin 21 | RB0/INT — PORTB bit 0 / External interrupt input |
| 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 — PORTB bit 6 |
| Pin 28 | RB7 — PORTB bit 7 |
Typical Applications
PIC16LC72-04I/SS is suitable for 7 applications: Low-Power Remote Sensor Node, White Goods and Home Appliance Control, HVAC Control Module, Automotive Interior Lighting Controller, Industrial Timer/Counter Subsystem, Consumer Electronics Remote Control, Security and Access Control Panel.
Low-Power Remote Sensor Node
The PIC16LC72-04I/SS is well suited for battery-powered remote sensor nodes because it operates from 2.5V to 5.5V (compatible with 2x AA alkaline cells or a single lithium cell) and the LC variant has low quiescent current draw. Its integrated 8-bit 5-channel ADC allows direct connection of temperature, humidity, or light sensors without external ADC components. Timer1 can increment during sleep via an external 32.768 kHz crystal, enabling periodic wake-up duty cycling. The I2C/SPI SSP supports external sensor modules or EEPROM data logging.
Recommended
White Goods and Home Appliance Control
The PIC16LC72-04I/SS fits white goods (washing machines, dishwashers, microwave ovens, refrigerators) because its 22 I/O pins drive multiple loads, sensors, and user interface elements, while the industrial -40C to +85C temperature range tolerates kitchen/laundry thermal environments. OTP program memory reduces BOM cost for high-volume appliance production where firmware is locked at manufacturing. The I2C interface drives LCD or LED display modules and EEPROM for user setting storage.
Recommended
HVAC Control Module
The PIC16LC72-04I/SS works well in HVAC thermostat and damper control modules where its 8-bit ADC reads multiple temperature sensors (room, supply air, return air), digital I/O drives relay controls for fans and valves, and I2C connects to the LCD display and external EEPROM for setpoint storage. The industrial temperature grade handles indoor HVAC equipment thermal stress. Timer0/Timer1/Timer2 provide the precise timing needed for PID loop control and scheduling functions.
Recommended
Automotive Interior Lighting Controller
The PIC16LC72-04I/SS serves automotive dome-light, ambient lighting, and interior LED controller applications where 22 I/O pins drive multiple LED channels via PWM or simple GPIO control. The industrial temperature range covers cabin environments. I2C connects to body control modules for command input, and the 8-bit ADC monitors battery voltage or ambient light sensors for automatic on/off control. OTP memory locks the lighting pattern firmware at production.
Recommended
Industrial Timer/Counter Subsystem
The PIC16LC72-04I/SS fits industrial timer, counter, and process controller subsystems because its three timers (8-bit Timer0, 16-bit Timer1, 8-bit Timer2) handle multiple independent time bases for sequencing, debouncing, and PWM generation. The 8-bit ADC reads 4-20 mA process signals via a sense resistor, and the industrial temperature grade operates reliably in factory ambient conditions. 22 I/O pins drive relays, status LEDs, and keypad inputs.
Recommended
Consumer Electronics Remote Control
The PIC16LC72-04I/SS supports consumer IR/RF remote controls because its low-power CMOS design extends battery life across months of standby, and the integrated ADC reads battery voltage for low-battery warnings. The I2C/SPI SSP can drive external RF transceivers or IR modulator ICs. The 22 I/O pins scan a full matrix keypad (4x5 or 5x4) and drive status LEDs without external logic, keeping BOM cost minimal.
Recommended
Security and Access Control Panel
The PIC16LC72-04I/SS fits security alarm panels, door access controllers, and keypad-based entry systems because its I2C/SPI interface connects to external EEPROM for credential storage and to LCD displays for status indication. The 22 I/O pins scan matrix keypads (4x4 or larger), drive multiple zone-status indicators, and control relay outputs for door strikes or sirens. OTP memory prevents field firmware tampering in security applications.
Recommended
Recommended Products Summary
Engineering reference data for PIC16LC72-04I/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16LC72-04I/SP | PIC16LC72I-04/SS | PIC16LC711-04I/SO | PIC16LC711-04/SO |
|---|---|---|---|---|---|
| Package | 28-SSOP | 28-SPDIP | 28-SSOP - same | 28-SOIC | 28-SOIC |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory | 3.5 KB OTP | 3.5 KB OTP | 3.5 KB OTP | 1.75 KB OTP | 1.75 KB OTP |
| RAM Size | 128 bytes | 128 bytes | 128 bytes | 68 bytes | 68 bytes |
| Max Clock Frequency | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz |
| ADC | 8-bit, 5 channels | 8-bit, 5 channels | 8-bit, 5 channels | 8-bit, 4 channels | 8-bit, 4 channels |
| I/O Pins | 22 | 22 | 22 | 15 | 15 |
| Connectivity | I2C, SPI | I2C, SPI | I2C, SPI | I2C, SPI | I2C, SPI |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | 0C to +70C |
Key Differentiators
- Mid-range PIC architecture with 3.5KB OTP and 5-channel 8-bit ADC (vs PIC16LC711-04I/SO)
- Same SSOP-28 package for drop-in compatibility with temperature grade variants (vs PIC16LC72I-04/SS)
- Integrated I2C/SPI synchronous serial port for peripheral expansion (vs PIC16LC558T-04/SO)
Design Notes
Decouple VDD (pin 20) with a 100 nF ceramic capacitor placed within 5 mm of the VDD pin, and add a bulk 10 uF tantalum or aluminum capacitor near the IC. The PIC16LC72-04I/SS operates from 2.5V to 5.5V. For battery-powered designs, use the LC variant's lower quiescent current and put the device into sleep mode between ADC conversions. Add a series inductor or ferrite bead on VDD if the supply is shared with a switching regulator to prevent digital switching noise from coupling into the analog ADC measurements.
The 28-SSOP package has 0.65 mm pitch leads and gull-wing terminations. Route all 28-SSOP signals on a single routing layer if possible, and use a ground pour on the opposite side. Place the MCLR pull-up resistor (typically 10 kohm) close to pin 1, and route the crystal/oscillator traces to pins 9-10 with short, symmetric traces and a guard ring tied to ground. Avoid routing high-speed signals (CCP PWM, SPI clock) under or near the analog ADC inputs (RA0-RA5/AN0-AN4) to minimize digital-to-analog crosstalk.
OTP (one-time programmable) memory cannot be erased or rewritten - once a PIC16LC72-04I/SS is programmed, the firmware is locked. Engineers should develop and debug using a flash-based sibling such as PIC16F72-I/SS, then transition to the LC72 for production to save BOM cost. Ensure MCLR (pin 1) is never left floating during operation - use a proper pull-up to VDD. When using the ADC, allow adequate acquisition time (typically 20 us) before starting conversion to avoid channel-to-channel crosstalk and inaccurate readings.
Compliance Information
Compliance status not explicitly stated in the verified web data. RoHS/REACH lead-free status should be confirmed with Microchip directly for production designs. AEC-Q100 not applicable - this part targets industrial/consumer applications, not automotive-grade qualification. The OTP (one-time programmable) memory and 28-SSOP package suggest this is a legacy, mature product.
