PIC16LC622-04E/P - 4MHz 8-Bit CMOS MCU, 3.5KB OTP | Microchip
MPN: PIC16LC622-04E/P ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.85 | $2.85 |
| 10 | $2.55 | $25.50 |
| 100 | $2.18 | $218.00 |
| 500 | $1.86 | $930.00 |
| 1,000 | $1.59 | $1,590.00 |
PIC16LC622-04E/P Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory (ROM/RAM), and programmable I/O peripherals. The PIC16LC622 belongs to the 8-bit microcontroller family -> CMOS microcontroller -> embedded controller -> semiconductor hierarchy. The "LC" prefix designates the low-power CMOS variant of the PIC16C62x series, optimized for battery-friendly operation. The device uses Harvard architecture with 12-bit wide instructions and an 8-bit data path, and offers direct, indirect, and relative addressing modes with seven or eight special-function hardware registers.
Key features include 12 general-purpose I/O pins capable of driving LED loads directly, on-chip power-on reset, watchdog timer, brown-out reset (on some variants), and an 8-bit timer/counter. The OTP program memory allows factory or one-time field programming, which is useful for low-volume or fixed-function production runs where in-system reprogrammability is not required. Compared to flash-based PIC16F parts, the OTP C-variant is typically lower cost per unit at higher volumes but cannot be re-programmed in-circuit.
Typical applications include industrial automation controllers, consumer electronics front panels, motor control interfaces, HVAC thermostat logic, and legacy replacement of older PIC16C62x designs. The wide 2.5 V–6.0 V supply range simplifies integration into both 3.3 V and 5 V rails without level shifting. The 04 speed grade indicates 4 MHz maximum clock; the "E" suffix denotes the extended industrial temperature range.
When designing with this part, ensure that the program memory type (OTP vs Flash) matches the production programming model, since OTP parts cannot be reprogrammed in-circuit. For new designs, consider the pin-compatible flash-based PIC16F628 or PIC16F84A family for in-system reprogrammability; the LC622 is generally preferred as a long-lifecycle drop-in for legacy systems. Decoupling capacitors (100 nF) should be placed within 5 mm of VDD/VSS pins, and unused I/O should be configured as outputs low to minimize current draw.
Drop-in alternatives for PIC16LC622-04E/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 PIC16LC622-04E/P (same form factor and footprint) — differing in Package, Operating Temperature Range, Program Memory Type, I/O Pins, Program Memory Size.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16LC621A-04E/P
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$1.78 / Unit
View Datasheet →PIC16LC620A-04E/P
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$1.85 / Unit
View Datasheet →PIC16LC622-04I/P
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$1.55 / Unit
View Datasheet →PIC16LC622-04/P
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC16F628A-I/P
✅ Drop-In✓ In Stock
$1.62 / Unit
View Datasheet →PIC16LC622-04E/P Maximum Ratings & Electrical Characteristics
| Core Processor | PIC |
| Core Size | 8-Bit |
| Series | PIC 16C |
| Maximum Clock Speed | 4 MHz |
| Instruction Cycle | 200 ns (single-cycle, except branches) |
| Program Memory Type | OTP (One-Time-Programmable) |
| Program Memory Size | 3.5 KB (2K x 14) |
| Number of I/O Pins | 12 |
| Supply Voltage (VDD) | 2.5 V to 6.0 V |
| Operating Temperature Range | -40 °C to +125 °C (industrial, "E" suffix) |
| Package | 18-PDIP (0.300", 7.62 mm), through-hole |
| Architecture | RISC, Harvard (12-bit instruction / 8-bit data path) |
| Number of Instructions | 35 |
| Hardware Stack Depth | 2 levels |
| Mounting Type | Through-Hole |
PIC16LC622-04E/P Pin Configuration
| Pin 1 | RA2 — I/O port A bit 2 |
| Pin 2 | RA3 — I/O port A bit 3 |
| Pin 3 | RA4/T0CKI — I/O port A bit 4 / Timer0 clock input |
| Pin 4 | MCLR/VPP — Master Clear (reset) / programming voltage |
| Pin 5 | VSS — Ground reference |
| Pin 6 | RB0/INT — I/O port B bit 0 / external interrupt |
| Pin 7 | RB1 — I/O port B bit 1 |
| Pin 8 | RB2 — I/O port B bit 2 |
| Pin 9 | RB3 — I/O port B bit 3 |
| Pin 10 | RB4 — I/O port B bit 4 |
| Pin 11 | RB5 — I/O port B bit 5 |
| Pin 12 | RB6 — I/O port B bit 6 |
| Pin 13 | RB7 — I/O port B bit 7 |
| Pin 14 | VDD — Positive supply (2.5–6.0 V) |
| Pin 15 | OSC2/CLKOUT — Oscillator output / clock output |
| Pin 16 | OSC1/CLKIN — Oscillator input / external clock input |
| Pin 17 | RA0 — I/O port A bit 0 |
| Pin 18 | RA1 — I/O port A bit 1 |
Typical Applications
PIC16LC622-04E/P is suitable for 6 applications: Industrial Automation Controllers, Consumer Electronics Front Panels, HVAC Thermostat Logic, Motor Control Interfaces, Legacy Replacement / Long-Lifecycle Products, LED Lighting Control Modules.
Industrial Automation Controllers
The PIC16LC622-04E/P fits industrial automation controllers thanks to its extended -40 °C to +125 °C temperature range, 2.5 V–6.0 V supply tolerance, and 12 digital I/O pins sufficient for sensor polling, relay driving, and status LED indication. Its OTP program memory locks the control firmware once verified, eliminating field-reprogramming risk in safety-critical loops. The 4 MHz CPU executes single-cycle instructions in 200 ns, fast enough for typical PLC scan times under 10 ms when handling a dozen I/O. Engineers frequently pair it with optocouplers and 24 V logic interfaces via simple resistor dividers, leveraging its wide supply window to share the same 5 V rail with logic-level peripherals. Long-term Microchip production commitment supports 10+ year factory-floor deployments.
Recommended
Consumer Electronics Front Panels
Consumer front-panel controllers benefit from the PIC16LC622-04E/P's 12 I/O pins (enough for 7-segment displays, keypads, and indicator LEDs), 35-instruction RISC core, and low BOM cost. The 2.5 V–6.0 V supply range allows direct connection to either 3.3 V or 5 V system rails without level shifters. OTP program memory reduces unit cost at high volumes where the firmware is finalized — typical for microwave ovens, washing machine HMIs, and set-top box displays. The 200 ns instruction cycle supports multiplexed LED scanning at refresh rates above 100 Hz with no perceptible flicker. Industrial temperature grade also handles enclosed chassis heat in kitchen and laundry environments.
Recommended
HVAC Thermostat Logic
HVAC thermostat designs use the PIC16LC622-04E/P for its deterministic single-cycle instruction execution and reliable OTP firmware lock, which prevents accidental field reprogramming that could compromise safety logic. The 12 I/O pins handle temperature sensor inputs (via external ADC), relay outputs for compressor and fan control, and LCD or LED display drivers. Its -40 °C to +125 °C operating range covers the full HVAC envelope from unheated attics to boiler-room enclosures. The 4 MHz clock and 35-instruction RISC core execute proportional-integral control loops well under 1 ms, ensuring smooth temperature regulation. Wide supply tolerance accepts 24 VAC half-wave rectified rails after regulation.
Recommended
Motor Control Interfaces
Small brushed DC and unipolar stepper motor control interfaces use the PIC16LC622-04E/P to generate phase sequences, monitor current-sense comparators, and provide stall detection. The 4 MHz CPU clock and 200 ns single-cycle instructions allow precise commutation timing up to a few kHz without timer overflow issues. Twelve I/O pins easily drive four half-bridges or stepper phases via external MOSFET drivers. OTP firmware ensures the motor control algorithm cannot be altered in the field, a safety plus for medical or industrial pumps. Wide 2.5–6.0 V supply simplifies integration with 5 V gate driver rails.
Recommended
Legacy Replacement / Long-Lifecycle Products
The PIC16LC622-04E/P is the go-to choice for long-lifecycle products like industrial sensors, security panels, and metering equipment that must remain in production for 10–20 years. Microchip's ongoing ACTIVE lifecycle status and stable OTP supply chain let OEMs avoid costly re-qualification. The 18-PDIP through-hole package is also preferred for hand-soldered or wave-soldered assemblies in low-cost offshore manufacturing. When original PIC16C622 designs reach end-of-life, the LC622-04E/P provides a drop-in modern replacement with identical pinout, instruction set, and timing characteristics. Engineers migrating legacy firmware typically only need to adjust oscillator configuration bits for the wider supply range.
Recommended
LED Lighting Control Modules
LED lighting controllers benefit from the PIC16LC622-04E/P's 12 I/O for driving multiple LED channels via external MOSFETs or constant-current drivers. The 4 MHz CPU easily handles software PWM dimming at a few hundred Hz, eliminating flicker perceived by the human eye. OTP firmware locks the lighting curve and color-mixing algorithm once tuned, preventing tampering in architectural or signage installations. Wide 2.5–6.0 V supply accepts common LED driver rails without additional regulation. Extended -40 °C to +125 °C operation covers outdoor signage in direct sunlight and cold-storage facility lighting.
Recommended
Recommended Products Summary
Engineering reference data for PIC16LC622-04E/P — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16LC621A-04E/P | PIC16LC620A-04E/P | PIC16LC622-04I/P | PIC16F628A-I/P |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 18-PDIP | 18-PDIP (same) | 18-PDIP (same) | 18-PDIP (same) | 18-PDIP (same) |
| Program Memory | 3.5 KB OTP (2K x 14) | 1.75 KB OTP (-50%) | 0.875 KB OTP (-75%) | 3.5 KB OTP (same) | 3.5 KB Flash (reprogrammable) |
| Max Clock Speed | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 20 MHz |
| Supply Voltage | 2.5 V to 6.0 V | 2.5 V to 6.0 V | 2.5 V to 6.0 V | 2.5 V to 6.0 V | 3.0 V to 5.5 V |
| Operating Temperature | -40 °C to +125 °C (E suffix) | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +85 °C | -40 °C to +85 °C |
| Memory Type | OTP (one-time programmable) | OTP | OTP | OTP | Flash (in-circuit reprogrammable) |
| I/O Pins | 12 | 12 | 12 | 12 | 16 |
Key Differentiators
- Extended -40 °C to +125 °C industrial temperature range (vs PIC16LC622-04I/P)
- 3.5 KB OTP program memory — largest in PIC16LC62x family (vs PIC16LC621A-04E/P)
- Low-power CMOS architecture with wide 2.5 V–6.0 V supply (vs PIC16F628A-I/P)
Design Notes
The PIC16LC622-04E/P's wide 2.5 V–6.0 V supply tolerance allows operation from regulated 3.3 V or 5 V rails without level shifting. Place a 100 nF decoupling capacitor within 5 mm of the VDD (pin 14) and VSS (pin 5) pins, and add a bulk 10 µF electrolytic near the supply origin. For 24 VAC-derived supplies common in HVAC designs, use a bridge rectifier + linear regulator and ensure the regulator output stays below 6.0 V absolute maximum. Brown-out detection (if enabled in configuration bits) will reset the MCU when VDD drops below ~3.5 V, preventing code corruption in OTP memory.
Do not assume OTP parts can be reprogrammed — once written, PIC16LC622-04E/P code cannot be erased. Always program verified firmware using a Microchip-approved device programmer (PICkit 2/3 or MPLAB PM3). Unused pins should be configured as outputs and driven low to minimize quiescent current draw. Avoid leaving floating inputs, as the CMOS inputs can draw several microamps each when floating near the switching threshold. If external interrupts are not used, ensure the RB0/INT pin is tied high or low via a defined resistor network.
For the 18-PDIP package, route the crystal/oscillator traces (OSC1/OSC2) short and symmetric, guarding them with a ground pour to minimize EMI coupling. Place the MCLR/VPP reset pin decoupling capacitor (typically 10–100 nF) close to the pin to filter noise that could cause spurious resets. Keep digital switching traces away from analog sensor inputs. The 18-PDIP through-hole footprint suits wave soldering and hand-repair; for high-volume surface-mount production, migrate to PIC16F628A-I/SO or PIC16F628A-I/SS.
Compliance Information
RoHS/REACH/lead-free status not stated in verified distributor snippets; consult Microchip product page or manufacturer declaration for definitive compliance. Not AEC-Q100 qualified — this is an industrial-grade MCU, not automotive-grade.
