PIC16LC432-I/P - 8-bit MCU, 3.5KB OTP, 12 I/O | Microchip
MPN: PIC16LC432-I/P ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.8 | $5.80 |
| 10 | $5.22 | $52.20 |
| 100 | $4.64 | $464.00 |
| 500 | $4.18 | $2,090.00 |
| 1,000 | $3.72 | $3,720.00 |
PIC16LC432-I/P Overview
An 8-bit microcontroller is a single-chip computer that integrates an 8-bit CPU core, program memory (ROM/OTP/Flash), data memory (RAM), and peripherals on a single die. The PIC16LC family uses a Harvard RISC architecture with a reduced instruction set of 35 single-word instructions, executing one instruction per clock cycle (excluding branches). This 8-bit MCU sits within the broader taxonomy: microcontroller -> embedded MCU -> semiconductor -> integrated circuit. The 'L' in PIC16LC432 indicates the low-power CMOS variant of the PIC16C432 OTP family, intended for battery-friendly designs versus the standard PIC16C432.
Key features include a 20 MHz operating frequency, 14-bit instruction word, 8-bit data path, integrated Brown-out Detect/Reset (BOR), Power-On Reset (POR), Watchdog Timer (WDT) with on-chip RC oscillator, and dual oscillator support (external RC or LP/XT/HS crystal). The device operates across a wide 2.5V-6.0V Vdd range typical of the LC variant and supports in-circuit serial programming (ICSP) via the RB6/RB7 pins.
The PIC16LC432-I/P uses Microchip's enhanced mid-range core architecture with a 14-bit program counter that can address up to 8K x 14 of program memory. The OTP memory is factory-programmable once, making this part suitable for mature low-volume production where firmware is fixed. The core integrates a hardware multiplier-free ALU and 8-level deep hardware stack, with interrupt handling through a single-vector or multi-source scheme.
Typical applications include industrial control logic, automotive body modules, simple sensor interface boards, appliance control panels, and battery-powered remote sensors that need a low-power 8-bit MCU with a small package and basic analog/digital peripherals. The 20-pin PDIP package also supports easy breadboard prototyping and educational/hobbyist use.
When designing with this part, consider that OTP memory cannot be re-programmed; for development, use the PIC16F432 or PIC16C432 JW (windowed) variants. Ensure decoupling is placed close to Vdd and that MCLR is pulled high through a resistor for proper reset behaviour. The 12 I/O pins are shared with peripheral functions, so plan pin allocation carefully.
This page synthesizes distributor pricing, parametric drop-in alternatives, and practical design notes that go beyond what the manufacturer datasheet alone provides, helping engineers evaluate the PIC16LC432-I/P for both new designs and legacy maintenance.
Drop-in alternatives for PIC16LC432-I/P — 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 PIC16LC432-I/P (same form factor and footprint) — differing in Core Architecture, Instruction Set, Mounting Type, RAM Size.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C432-I/P
✅ Drop-In✓ In Stock
$4.1 / Unit
View Datasheet →PIC16F432-I/P
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C432-20/P
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16F432-E/P
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC16LF432-I/P
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC16C505-20/P
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC16LC432-I/P Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC16 (8-bit Harvard RISC) |
| Program Memory Size | 3.5 KB (2K x 14) OTP |
| RAM Size | 128 x 8 bytes (128 B) |
| Maximum Clock Frequency | 20 MHz |
| Number of I/O Pins | 12 |
| Package / Case | 20-DIP (0.300 inch, 7.62 mm) |
| Operating Temperature | -40C to +85C (Industrial, I grade) |
| Instruction Set | 35 single-word instructions |
| Instruction Word Length | 14 bits |
| Program Counter Width | 14 bits (8K x 14 addressable) |
| Stack Depth | 8 levels (hardware) |
| Brown-out Reset (BOR) | Yes |
| Power-On Reset (POR) | Yes |
| Watchdog Timer (WDT) | Yes, with on-chip RC oscillator |
| In-Circuit Serial Programming (ICSP) | Yes (via RB6/RB7) |
| Oscillator Modes | External RC, LP, XT, HS crystal |
| Mounting Type | Through-Hole (THT) |
PIC16LC432-I/P Pin Configuration
| Pin 1 | RA2 — General-purpose I/O / analog channel |
| Pin 2 | RA3 — General-purpose I/O / MCLR alternative |
| Pin 3 | RA4 — General-purpose I/O / Timer0 clock |
| Pin 4 | MCLR — Master Clear reset (active low) |
| Pin 5 | VSS — Ground reference |
| Pin 6 | RB0 — General-purpose I/O / interrupt |
| Pin 7 | RB1 — General-purpose I/O |
| Pin 8 | RB2 — General-purpose I/O |
| Pin 9 | RB3 — General-purpose I/O |
| Pin 10 | RB4 — General-purpose I/O / interrupt-on-change |
| Pin 11 | RB5 — General-purpose I/O / interrupt-on-change |
| Pin 12 | RB6 — General-purpose I/O / ICSP clock |
| Pin 13 | RB7 — General-purpose I/O / ICSP data |
| Pin 14 | VDD — Positive supply voltage |
| Pin 15 | OSC2 — Crystal/oscillator output |
| Pin 16 | OSC1 — Crystal/oscillator input |
| Pin 17 | RA0 — General-purpose I/O / analog channel |
| Pin 18 | RA1 — General-purpose I/O / analog channel |
| Pin 19 | RA5 — General-purpose I/O / SS pin |
| Pin 20 | VSS — Ground reference (secondary) |
Typical Applications
PIC16LC432-I/P is suitable for 6 applications: Industrial Control Logic, Automotive Body Electronics, Battery-Powered Sensor Interface, Appliance Control Panels, Educational and Hobbyist Projects, Simple Remote Control Transmitters.
Industrial Control Logic
The PIC16LC432-I/P fits industrial control logic boards where 12 digital I/O pins, 8-bit arithmetic, and the Brown-out Reset and Watchdog Timer provide robust supervisory control of relays, valves, and indicator LEDs. Its 20 MHz CPU and 3.5 KB OTP program memory can host PID loops, debounced keypad scanning, and Modbus-style UART protocols at modest baud rates. The 20-pin PDIP package allows through-hole PCB construction preferred in industrial cabinets for mechanical durability and easy field replacement. Power consumption in the LC variant is much lower than the standard C variant, suiting 24V-powered control cards with linear regulators.
Recommended
Automotive Body Electronics
The PIC16LC432-I/P suits simple automotive body modules such as interior lamp dimmers, seat-position controllers, and HVAC mode selectors that need a small, low-power 8-bit MCU with up to 12 I/O and integrated Watchdog Timer. The LC variant's low quiescent current is attractive for always-on body modules that wake periodically to check switches. Its industrial -40C to +85C temperature range covers most cabin environments, though under-hood modules should migrate to AEC-Q100 qualified parts. The 20-pin PDIP is a through-hole option suitable for prototype body controllers before moving to SOIC for production.
Recommended
Battery-Powered Sensor Interface
The PIC16LC432-I/P is well matched to battery-powered sensor interface boards where the LC variant's nanoWatt-class sleep current extends battery life across multi-year deployments. The MCU can wake periodically via Watchdog Timer, sample a sensor over ADC, and return to sleep, all within the 3.5 KB OTP program space. The 12 I/O pins accommodate SPI or I2C sensor buses plus discrete interrupt lines. For sensor nodes needing BLE or Wi-Fi, consider Microchip's RN4020 or PIC16F1xx with integrated radio rather than the PIC16LC432.
Recommended
Appliance Control Panels
The PIC16LC432-I/P works well in appliance control panels for washing machines, dishwashers, and microwave ovens where 12 I/O drive 7-segment displays, keypads, buzzer, and relay logic. The 20 MHz CPU handles multiplexed LED scanning and switch debouncing with cycles to spare, while the 3.5 KB OTP memory holds the appliance state machine and lookup tables. The integrated Power-On Reset and Brown-out Reset ensure clean recovery from power dips common on appliance mains. The 20-pin PDIP package fits through-hole control board designs favored for cost-sensitive appliance manufacturing.
Recommended
Educational and Hobbyist Projects
The PIC16LC432-I/P is a friendly choice for educational microcontroller labs and hobbyist projects thanks to its 20-pin PDIP package that drops directly into breadboards and solderless prototyping boards. The 8-bit PIC16 architecture with 35 instructions is approachable for learners, and MPLAB X IDE plus PICkit programmers program the OTP via ICSP. The 12 I/O pins support common peripherals like LEDs, switches, character LCDs, and simple sensors. Cost per unit is low for classroom packs, and the same die is available in flash for student experimentation.
Recommended
Simple Remote Control Transmitters
The PIC16LC432-I/P can serve as the MCU inside simple remote control transmitters for garage doors, ceiling fans, or RF-controlled outlets where low sleep current and a small package are key. The 12 I/O drive button matrices and an RF transmitter enable/disable line, while the 3.5 KB OTP holds button debouncing and rolling-code or fixed-code logic. The LC variant's low quiescent current extends battery life for years of standby operation. The 20-pin PDIP fits inside compact plastic enclosures with through-hole-friendly PCB layouts.
Recommended
Recommended Products Summary
Engineering reference data for PIC16LC432-I/P — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C432-I/P | PIC16F432-I/P | PIC16C432-20/P | PIC16F432-E/P | PIC16LF432-I/P |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 20-PDIP | 20-PDIP | 20-PDIP | 20-PDIP | 20-PDIP | 20-PDIP |
| Core | 8-bit PIC16 mid-range | 8-bit PIC16 mid-range | 8-bit PIC16 mid-range | 8-bit PIC16 mid-range | 8-bit PIC16 mid-range | 8-bit PIC16 mid-range (XLP) |
| Program Memory | 3.5 KB OTP | 3.5 KB OTP | 3.5 KB Flash | 3.5 KB OTP | 3.5 KB Flash | 3.5 KB Flash |
| RAM | 128 B | 128 B | 128 B | 128 B | 128 B | 128 B |
| Max Clock | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| I/O Pins | 12 | 12 | 12 | 12 | 12 | 12 |
| Memory Type | OTP | OTP | Flash | OTP | Flash | Flash |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | 0C to +70C | -40C to +125C | -40C to +85C |
Key Differentiators
- Low-power CMOS process (LC variant) (vs PIC16C432-I/P)
- Re-programmability via Flash variant on same pinout (vs PIC16F432-I/P)
- Wide temperature range with E grade (vs PIC16F432-E/P)
Design Notes
OTP memory cannot be erased once programmed. Do not use PIC16LC432-I/P for development boards that require firmware iteration. Substitute the PIC16F432-I/P (Flash) for prototyping and then move to the LC OTP part once firmware is locked for production. Verify the ICSP programming voltage and timing per the Microchip specification before committing OTP parts to a production run.
Decouple Vdd (pin 14) with a 100 nF ceramic capacitor placed within 5 mm of the MCU pin, plus a 10 uF bulk capacitor on the supply rail. MCLR (pin 4) must be tied to Vdd through a 10 kohm resistor; a direct short can prevent programming and reset behaviour. Avoid powering the MCU from a high-impedance source - the LC variant has low quiescent current but cannot drive large bulk loads from its I/O.
Place the crystal or resonator close to OSC1 (pin 16) and OSC2 (pin 15), with short symmetrical traces to ground. Keep digital switching traces away from the oscillator loop to avoid injecting noise into the system clock. For HS mode above 4 MHz, add a 100 ohm series resistor on OSC2 if the oscillator is a Pierce type, to limit drive level. Route ICSP lines RB6/RB7 to a 6-pin header for in-circuit programming.
Compliance Information
Lead-free per Microchip product page; RoHS/REACH status not explicitly confirmed in verified web data and marked as unknown. Not AEC-Q100 qualified; for AEC-Q100 applications use AEC-Q100 qualified PIC16 variants.
