PIC16LC65A-04/P - 8-Bit 4MHz 7KB OTP MCU | Microchip | DIP-40
MPN: PIC16LC65A-04/P ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $11.11 | $11.11 |
| 10 | $10.25 | $102.50 |
| 100 | $9.4 | $940.00 |
| 500 | $8.55 | $4,275.00 |
| 1,000 | $7.78 | $7,780.00 |
PIC16LC65A-04/P Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory, and programmable I/O peripherals. The PIC16C/LC family belongs to the broader 8-bit microcontroller category, which sits under the embedded computing -> semiconductor device hierarchy. LC variants are designed for low-voltage operation (down to ~2.5-3.0V), making them suitable for battery-powered designs where 'LC' stands for Low-power CMOS.
Key features include 33 digital I/O lines, an 8-channel 8-bit ADC, two 8-bit timers and one 16-bit timer, a USART for serial communication, a Capture/Compare/PWM (CCP) module, and a watchdog timer with its own on-chip RC oscillator for maximum reliability. The architecture is fully static, uses a Harvard design with separate program and data buses, and offers 35 single-word instructions where all instructions execute in a single cycle except program branches (two cycles).
The 4 MHz speed grade (the '-04' suffix) corresponds to a 4 MHz oscillator input with a 1 microsecond instruction cycle, balancing throughput and power consumption. The 40-pin PDIP form factor is the classic through-hole industrial/Educational/Maker-friendly footprint, ideal for breadboards, IC sockets, legacy upgrades, and test fixtures where mechanical robustness matters more than board area.
Typical applications include industrial control front-ends, appliance controllers, instrumentation subsystems, low-power sensor nodes, and educational development boards. The OTP memory suits volume production where the firmware is fixed and field-reprogramming is not required; for flash-based flexibility, the PIC16F-series is the typical upgrade path.
When designing with this MCU, account for the OTP memory limitation by using a UV-erasable windowed (JW) variant for prototype development, then migrating to the OTP 'P' package for production. Ensure your in-circuit emulator or programmer (e.g., PICSTART Plus, MPLAB PM3) supports the LC low-voltage range before committing to a hardware platform.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for PIC16LC65A-04/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 PIC16LC65A-04/P (same form factor and footprint) — differing in Package, Timers, Core, Instruction Set, Operating Temperature.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16LC65B-04/P
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$4.9 / Unit
View Datasheet →PIC16LC65A-04I/P
✅ Drop-In✓ In Stock
$4.65 / Unit
View Datasheet →PIC16F74-I/P
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C711-04/P
✅ Drop-In✓ In Stock
$2.54 / Unit
View Datasheet →PIC16F630-I/P
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16LC65A-04/P Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit PIC RISC |
| Program Memory Size | 7 KB (4K x 14) OTP |
| RAM Size | 192 bytes |
| Maximum CPU Speed | 4 MHz (1 us instruction cycle) |
| Supply Voltage (Vdd) | 3.0 V to 5.5 V |
| I/O Pins | 33 |
| ADC | 8 channels, 8-bit |
| Timers | 2 x 8-bit, 1 x 16-bit |
| Communication Interfaces | USART (SCI), SSP/SPI/I2C |
| CCP/PWM Modules | 1 |
| Watchdog Timer | Yes (with dedicated on-chip RC oscillator) |
| Instruction Set | 35 single-word instructions, all single-cycle except branches (2-cycle) |
| Program Memory Type | OTP (One-Time-Programmable) |
| Operating Temperature | -40 C to +85 C (industrial) |
| Package | 40-pin PDIP (DIP-40, 0.600 in / 15.24 mm) |
| Mounting Type | Through-Hole |
| Pin Count | 40 |
PIC16LC65A-04/P Pin Configuration
| Pin 1 | MCLR/VPP — Master clear reset (active low) / programming voltage input |
| 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 / ADC reference |
| Pin 6 | RA4/T0CKI — PORTA bit 4 / Timer 0 clock input |
| Pin 7 | RA5/AN4/SS — PORTA bit 5 / analog input 4 / SPI slave select |
| Pin 8 | RE0/RD/AN5 — PORTE bit 0 / read control / analog input 5 |
| Pin 9 | RE1/WR/AN6 — PORTE bit 1 / write control / analog input 6 |
| Pin 10 | RE2/CS/AN7 — PORTE bit 2 / chip select / analog input 7 |
| Pin 11 | VDD — Positive supply (3.0-5.5 V) |
| Pin 12 | VSS — Ground reference |
| Pin 13 | OSC1/CLKIN — Oscillator input / external clock input |
| Pin 14 | OSC2/CLKOUT — Oscillator output / clock out |
| Pin 15 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| Pin 16 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 output |
| Pin 17 | RC2/CCP1 — PORTC bit 2 / CCP1 PWM output |
| Pin 18 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Pin 19 | RD0/PSP0 — PORTD bit 0 / parallel slave port bit 0 |
| Pin 20 | RD1/PSP1 — PORTD bit 1 / parallel slave port bit 1 |
| Pin 21 | RD2/PSP2 — PORTD bit 2 / parallel slave port bit 2 |
| Pin 22 | RD3/PSP3 — PORTD bit 3 / parallel slave port bit 3 |
| Pin 23 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Pin 24 | RC5/SDO — PORTC bit 5 / SPI data out |
| Pin 25 | RC6/TX/CK — PORTC bit 6 / USART TX / clock |
| Pin 26 | RC7/RX/DT — PORTC bit 7 / USART RX / data |
| Pin 27 | RD4/PSP4 — PORTD bit 4 / parallel slave port bit 4 |
| Pin 28 | RD5/PSP5 — PORTD bit 5 / parallel slave port bit 5 |
| Pin 29 | RD6/PSP6 — PORTD bit 6 / parallel slave port bit 6 |
| Pin 30 | RD7/PSP7 — PORTD bit 7 / parallel slave port bit 7 |
| Pin 31 | VSS — Ground reference |
| Pin 32 | VDD — Positive supply (3.0-5.5 V) |
| Pin 33 | RB0/INT — PORTB bit 0 / external interrupt |
| Pin 34 | RB1 — PORTB bit 1 |
| Pin 35 | RB2 — PORTB bit 2 |
| Pin 36 | RB3/PGM — PORTB bit 3 / LVP programming |
| Pin 37 | RB4 — PORTB bit 4 |
| Pin 38 | RB5 — PORTB bit 5 |
| Pin 39 | RB6/PGC — PORTB bit 6 / ICD clock |
| Pin 40 | RB7/PGD — PORTB bit 7 / ICD data |
Typical Applications
PIC16LC65A-04/P is suitable for 6 applications: Industrial Control Front-End, Appliance Control Board, Educational Development Board, Instrumentation Subsystem, Low-Power Sensor Node, Legacy Replacement / Service Stock.
Industrial Control Front-End
The PIC16LC65A-04/P suits industrial control front-ends where 33 digital I/O, an 8-channel 8-bit ADC, and one USART deliver enough analog and digital channels for sensor aggregation and actuator drive at 3.3 V or 5 V. Its 4 MHz core and 7 KB OTP program memory cover typical PID loops, multi-channel sensor scans, and Modbus-style polling without external logic. The 40-pin PDIP package also simplifies in-field replacement and socket-based servicing on legacy industrial lines. Pair with the PIC16F74-I/P Flash variant for new designs where firmware iteration matters more than unit cost.
Recommended
Appliance Control Board
In appliance controllers (white goods, kitchen equipment, HVAC dampers), the PIC16LC65A-04/P provides the digital I/O count to drive relays, triacs, and LED indicators while reading thermistors or pressure sensors through its 8-channel ADC. The 1 us instruction cycle at 4 MHz is sufficient for slow control loops, while the LC low-voltage range supports battery-backed or energy-saving subcircuits. The 40-pin PDIP form factor eases manufacturing with through-hole assembly and traditional wave-solder processes. Its watchdog timer with dedicated RC oscillator improves reliability in unattended appliance installations.
Recommended
Educational Development Board
The PIC16LC65A-04/P is a classic PIC16 mid-range teaching platform because the 40-pin PDIP format fits breadboards and educational trainer sockets directly. Students can exercise the ADC, USART, timers, and CCP PWM module on a single chip at 4 MHz without surface-mount rework. The OTP memory forces disciplined firmware planning, mirroring real production constraints. The instruction set of only 35 single-word instructions is small enough to be mastered in a semester course, and the PICSTART Plus / MPLAB PM3 toolchain supports LC-voltage programming out of the box.
Recommended
Instrumentation Subsystem
For instrumentation subassemblies (data loggers, panel meters, low-speed signal conditioners), the PIC16LC65A-04/P offers an 8-channel 8-bit ADC plus USART for sending digitized values to a host controller or display. Its 192-byte RAM and 4 MHz throughput are well-matched to slow multiplexed scans of thermocouples, strain gauges, or potentiometers. The 40-pin PDIP package and 3.0-5.5 V supply make it compatible with both legacy 5 V analog front-ends and modern 3.3 V signal chains, while OTP memory prevents accidental firmware tampering in field-deployed instruments.
Recommended
Low-Power Sensor Node
Battery-powered or energy-harvesting sensor nodes benefit from the PIC16LC65A-04/P 's LC low-voltage operation down to 3.0 V, which lets a single lithium cell or two AA batteries power the entire node. The 8-bit ADC plus digital I/O read temperature, humidity, or PIR sensors, and the USART forwards the data to a radio module such as an XBee or LoRa transceiver. SLEEP mode plus the watchdog timer achieves quiescent currents in the microamp range between measurements. The DIP-40 package simplifies hand-soldered prototyping of remote environmental monitors.
Recommended
Legacy Replacement / Service Stock
Many industrial installations built in the late 1990s and early 2000s use PIC16LC65A-04/P on through-hole control boards that have since gone obsolete or require long-term spares. The 40-pin PDIP remains the de facto industrial service stock footprint because it accepts IC sockets, allowing fast board swap without rework. Stocking PIC16LC65A-04/P ensures 15-20 year service continuity for legacy equipment; the LC65B revision and PIC16F74-I/P provide pin-compatible alternatives when the OTP 'A' revision reaches end-of-life.
Recommended
Recommended Products Summary
Engineering reference data for PIC16LC65A-04/P — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16LC65B-04/P | PIC16LC65A-04I/P | PIC16F74-I/P |
|---|---|---|---|---|
| Package | PDIP-40 | PDIP-40 - same | PDIP-40 - same | PDIP-40 - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory | 7 KB (4K x 14) OTP | 7 KB OTP | 7 KB OTP | 7 KB Flash |
| Maximum Frequency | 4 MHz | 4 MHz | 4 MHz | 20 MHz |
| Supply Voltage | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 2.0 V to 5.5 V |
| I/O Pins | 33 | 33 | 33 | 33 |
| ADC | 8 ch x 8-bit | 8 ch x 8-bit | 8 ch x 8-bit | 8 ch x 8-bit |
| Memory Type | OTP | OTP | OTP | Flash (reprogrammable) |
| Operating Temperature | 0 C to +70 C (commercial) | 0 C to +70 C (commercial) | -40 C to +85 C (industrial) | -40 C to +85 C (industrial) |
Key Differentiators
- Pin-for-pin drop-in with PIC16F74-I/P, but with OTP memory (vs PIC16F74-I/P)
- Silicon revision B available for new designs (vs PIC16LC65B-04/P)
- Industrial temperature range variant offered (vs PIC16LC65A-04I/P)
Design Notes
Estimated: Vdd supply design must provide 3.0-5.5 V with bulk decoupling of at least 1 x 100 nF ceramic close to pins 11/12 and 31/32 (both Vdd/Vss pairs). Add a 10 uF tantalum or aluminum bulk capacitor near the MCU for switching transients. For battery applications, total current draw in SLEEP is typically 1-5 uA with the watchdog disabled.
Place the 4 MHz crystal or resonator within 1 cm of OSC1/OSC2 (pins 13-14), with the load capacitors (typically 15-33 pF) tied to ground. Keep high-speed traces (USART, SPI) away from the oscillator area to prevent injection of jitter. Route MCLR (pin 1) with a 10 kohm pull-up and a 100 nF decoupling cap directly to the reset line to avoid spurious resets on noisy industrial busses.
Do not use the OTP (non-windowed) part for prototype development - once programmed, the device cannot be erased. Use the JW (windowed) variant or migrate to the Flash-based PIC16F74-I/P for development. Be aware that the '-04' speed grade is limited to 4 MHz; verify timing budgets before assuming the silicon can reach 10 or 20 MHz like the higher grades. Finally, on the LC family, do not drop Vdd below 3.0 V or brown-out resets will trigger randomly.
Analog inputs (RA0-RA5, RE0-RE2) should be guarded from digital switching traces by a ground pour on the analog side of the board. AVdd (when used as the ADC reference) must be tied to Vdd with its own 10 uH ferrite + 100 nF cap to reduce digital switching noise coupling into ADC samples. PORTB pull-ups (RBPU bit) should be enabled for switch inputs to avoid floating pins when the board is unpowered.
Compliance Information
RoHS and lead-free status not explicitly stated in the verified web data; Microchip PIC16 OTP parts are typically lead-free but confirmation requires manufacturer datasheet section 'Physical Dimensions' or product page. AEC-Q100 not applicable for this commercial-grade industrial MCU.
