PIC16LC622A-04E/SS - 4MHz 8-bit OTP MCU 3.5KB | Microchip
MPN: PIC16LC622A-04E/SS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.71 | $3.71 |
| 10 | $3.34 | $33.40 |
| 100 | $2.97 | $297.00 |
| 500 | $2.68 | $1,340.00 |
| 1,000 | $2.42 | $2,420.00 |
PIC16LC622A-04E/SS Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data RAM, and peripheral interfaces on one die. Within the broader taxonomy, PIC microcontrollers sit under the microcontrollers hierarchy, which itself belongs to integrated circuits and semiconductor devices. The PIC16C family specifically uses a Harvard RISC architecture with separate program and data buses, 12-bit or 14-bit wide instructions, and an 8-bit data path, enabling deterministic instruction execution in a single cycle except for program branches.
Key features of the PIC16LC622A-04E/SS include a two-level deep hardware stack, direct/indirect/relative addressing modes, seven or eight special-function hardware registers, and an integrated watchdog timer for reliable operation in electrically noisy environments. The wide 2.5 V to 5.5 V supply range allows direct connection to 3.3 V and 5 V rails without level translation, while the -40 °C to +125 °C automotive operating range qualifies it for harsh-environment deployments.
The LC process variant is engineered for low-power operation, drawing microamp-range supply current in sleep mode, which is critical for battery-powered or energy-harvesting endpoints. Its OTP program memory is one-time programmable but retains firmware permanently, providing field security without external memory components. The 20-pin SSOP package reduces board area versus the 28-pin and 40-pin PIC16 siblings while preserving the core peripheral set.
Typical applications include low-power embedded control nodes, automotive body electronics, sensor signal conditioning, appliance control boards, and simple user-interface controllers. It is also well suited to industrial monitoring and remote-control subsystems that demand a small footprint and a wide supply tolerance. Designers should note that the OTP memory cannot be reprogrammed, so a flash-based PIC16F equivalent is preferred for prototyping and field-updateable deployments.
Drop-in alternatives for PIC16LC622A-04E/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 PIC16LC622A-04E/SS (same form factor and footprint) — differing in Program Memory Size, Operating Temperature Range, Package, Program Memory Type, Peripherals.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16LC621A-04E/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16LC620A-04E/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16LC622A-04I/SS
✅ Drop-In✓ In Stock
$1.56 / Unit
View Datasheet →PIC16LC622A-04/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16LC621T-04/SS
✅ Drop-In✓ In Stock
$2.1 / Unit
View Datasheet →PIC16LC621AT-04I/SS
✅ Drop-In✓ In Stock
$2.46 / Unit
View Datasheet →PIC16LC620AT-04E/SS
✅ Drop-In✓ In Stock
$2.45 / Unit
View Datasheet →PIC16LC622A-04E/SS Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC 8-bit RISC (Harvard) |
| Program Memory Type | OTP (One-Time Programmable) EPROM |
| Program Memory Size | 3.5 KB (2K x 14 words) |
| Data RAM | 128 bytes |
| Maximum CPU Speed | 4 MHz |
| Instruction Width | 14 bits |
| Data Path Width | 8 bits |
| Supply Voltage Range | 2.5 V to 5.5 V |
| I/O Pins | 13 |
| Hardware Stack Levels | 2 |
| Addressing Modes | Direct, Indirect, Relative |
| Special Function Registers | 7 to 8 |
| Operating Temperature Range | -40 °C to +125 °C |
| Package | 20-pin SSOP |
| Mounting Type | Surface Mount |
| Process Variant | LC (Low-power CMOS) |
| Watchdog Timer | Yes |
PIC16LC622A-04E/SS Pin Configuration
| Pin 1 | RA0/AN0 — Bidirectional I/O / analog channel 0 |
| Pin 2 | RA1/AN1 — Bidirectional I/O / analog channel 1 |
| Pin 3 | RA2/AN2 — Bidirectional I/O / analog channel 2 |
| Pin 4 | RA3/AN3 — Bidirectional I/O / analog channel 3 |
| Pin 5 | RA4/T0CKI — Bidirectional I/O / Timer0 clock input |
| Pin 6 | RA5/SS — Bidirectional I/O / SPI slave select |
| Pin 7 | OSC1/CLKIN — Oscillator crystal input / external clock |
| Pin 8 | OSC2/CLKOUT — Oscillator crystal output / clock output |
| Pin 9 | RC0 — Bidirectional I/O port C |
| Pin 10 | RC1 — Bidirectional I/O port C |
| Pin 11 | RC2 — Bidirectional I/O port C |
| Pin 12 | RC3 — Bidirectional I/O port C |
| Pin 13 | RC4 — Bidirectional I/O port C |
| Pin 14 | RC5 — Bidirectional I/O port C |
| Pin 15 | RC6 — Bidirectional I/O port C |
| Pin 16 | RC7 — Bidirectional I/O port C |
| Pin 17 | RB0/INT — Bidirectional I/O / external interrupt |
| Pin 18 | RB1 — Bidirectional I/O port B |
| Pin 19 | VSS — Ground reference |
| Pin 20 | VDD — Positive supply voltage |
Typical Applications
PIC16LC622A-04E/SS is suitable for 6 applications: Automotive Body Electronics, Battery-Powered Sensor Nodes, Appliance Control Boards, Industrial Sensor Signal Conditioning, Remote Control and User Interface, Hobbyist and Educational Development.
Automotive Body Electronics
The PIC16LC622A-04E/SS is well suited to automotive body-electronics modules such as interior lighting controllers, mirror-adjust drivers, and seat-position sensors. Its -40 °C to +125 °C extended operating range exceeds AEC-Q100 temperature requirements for cabin-mounted ECUs, while the 2.5 V to 5.5 V supply range tolerates cranking transients on a 12 V automotive bus post-regulation. With 13 GPIO and 25 mA sink/source per pin, it can drive small relays and LEDs directly without external transistors.
Recommended
Battery-Powered Sensor Nodes
The PIC16LC622A-04E/SS LC process variant draws microamp-level sleep current, making it a strong fit for battery-powered sensor endpoints in remote monitoring, energy-harvesting, and wireless sensor networks. The 3.5 KB OTP program memory accommodates small RTOS-less state machines that wake on interrupt, read a sensor, transmit over UART, and return to sleep. The 2.5 V lower supply rail enables direct operation from a single lithium coin cell without a boost regulator.
Recommended
Appliance Control Boards
In white-goods and small-appliance control boards such as coffee makers, microwave keypads, washing-machine user interfaces, and dishwasher timers, the PIC16LC622A-04E/SS provides deterministic single-cycle instruction execution at 4 MIPS, sufficient for keypad scanning, LED multiplexing, and triac firing control. The 14-bit instruction word supports compact arithmetic on timer and ADC peripherals, while the OTP program memory locks firmware at production to prevent field tampering. The wide supply tolerance survives rectified mains-rail variation.
Recommended
Industrial Sensor Signal Conditioning
For industrial 4-20 mA loop-powered transmitters, thermocouple front ends, and bridge-sensor excitation modules, the PIC16LC622A-04E/SS provides 13 GPIO that can be configured for I2C or SPI master to external 24-bit ADCs, plus timer-capture inputs for frequency-output sensors. The 2.5 V lower supply allows operation from a 3.3 V regulated rail in compact DIN-rail enclosures. The extended temperature range supports outdoor and process-industry deployments.
Recommended
Remote Control and User Interface
In handheld remote controls, HVAC wall thermostats, garage-door keypads, and access-control panels, the PIC16LC622A-04E/SS integrates a low-power CPU core with sufficient GPIO for matrix keypads, IR LEDs, and LCD segment drivers. The OTP memory secures the pairing protocol against cloning, while the SSOP-20 package fits behind standard wall plates. The wide supply range simplifies powering from rectified 24 VAC thermostats or 9 V battery packs.
Recommended
Hobbyist and Educational Development
The PIC16LC622A-04E/SS is a popular teaching vehicle for introductory embedded courses covering RISC architecture, OTP programming workflows, and PIC assembly fundamentals. Its 20-pin SSOP package fits standard breakout boards, and Microchip's MPLAB X IDE with MPASMX assembler supports it natively. The 4 MIPS headroom allows instructors to demonstrate polling, interrupts, and timer-driven state machines within a single semester. The automotive-grade temperature range adds realism for student projects.
Recommended
Recommended Products Summary
Engineering reference data for PIC16LC622A-04E/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16LC621A-04E/SS | PIC16LC620A-04E/SS | PIC16LC622A-04I/SS | PIC16LC622A-04/SS | PIC16LC621T-04/SS |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 20-pin SSOP | 20-pin SSOP (same) | 20-pin SSOP (same) | 20-pin SSOP (same) | 20-pin SSOP (same) | 20-pin SSOP (same) |
| Program Memory | 3.5 KB OTP | 1.75 KB OTP | 0.875 KB OTP | 3.5 KB OTP (same) | 3.5 KB OTP (same) | 1.75 KB OTP |
| Maximum Clock Speed | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz |
| Supply Voltage Range | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V |
| I/O Pins | 13 | 13 | 13 | 13 | 13 | 13 |
| Operating Temperature | -40 °C to +125 °C (Extended) | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +85 °C (Industrial) | 0 °C to +70 °C (Commercial) | 0 °C to +70 °C (Commercial) |
| Data RAM | 128 B | 128 B | 128 B | 128 B | 128 B | 128 B |
Key Differentiators
- Largest OTP memory in the PIC16LC62x SSOP-20 family (vs PIC16LC621A-04E/SS)
- Extended automotive temperature range (vs PIC16LC622A-04/SS)
- Same SSOP-20 footprint as lower-memory siblings (vs PIC16LC620A-04E/SS)
- Lower-power LC process for sleep-mode critical designs (vs PIC16C622A-04E/SS (non-LC))
Design Notes
The PIC16LC622A-04E/SS LC process variant requires a clean 2.5 V to 5.5 V supply. Place a 100 nF decoupling capacitor as close as possible to the VDD pin (pin 20) with a short trace to VSS (pin 19). For battery-powered designs, add a 10 µF bulk capacitor on the supply rail to handle inrush when the oscillator starts. Estimated: assuming 4 MHz operation and average 2 mA active current, decoupling sustains VDD during interrupt-driven wake events.
OTP memory is one-time programmable; once a PIC16LC622A-04E/SS is programmed it cannot be erased. For prototyping, use the windowed ceramic-package PIC16CR622A-04E/SS variant or a flash-based PIC16F628 equivalent. Verify all configuration bits and oscillator calibration before final programming to avoid scrap. Microchip recommends reading back the device ID and verifying checksum after programming.
Keep the oscillator traces (OSC1 pin 7, OSC2 pin 8) short and surrounded by a ground pour to minimize stray capacitance that shifts the oscillator frequency. For crystals, place the load capacitors within 5 mm of the MCU pins. The SSOP-20 package has a center pad on some variants - follow Microchip land-pattern recommendations for thermal relief and solder-joint reliability.
At 4 MHz active operation the LC variant dissipates under 25 mW, well within the SSOP-20 thermal envelope of approximately 150 °C/W junction-to-ambient. In enclosed enclosures above 60 °C ambient, ensure the 1.5 W absolute maximum dissipation is not exceeded by peripheral loads. For high-I/O-count applications driving multiple LEDs simultaneously, calculate total sink current and verify against the 200 mA package limit.
Compliance Information
RoHS and REACH compliance per Microchip product page; AEC-Q100 not formally qualified (Extended temp grade supports automotive cabin use); lead-free SSOP-20 package. Halogen-free status not explicitly listed in distributor data.
