PIC16LC622A-04I/SS - 8-bit PIC MCU 3.5KB OTP 20-SSOP | Microchip
MPN: PIC16LC622A-04I/SS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.55 | $2.55 |
| 10 | $2.18 | $21.80 |
| 100 | $1.87 | $187.00 |
| 500 | $1.66 | $830.00 |
| 1,000 | $1.56 | $1,560.00 |
PIC16LC622A-04I/SS Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and peripheral I/O onto one piece of silicon. Within the broader taxonomy, the PIC16C622A sits in the 8-bit MCU class, under the PIC16 mid-range family, within Microchip's PIC microcontroller portfolio. The 'LC' prefix indicates the low-power CMOS process variant, optimized for low operating current and extended power-rail tolerance, while the 'A' suffix denotes the enhanced silicon revision offering 2 KB of program memory (versus 1 KB on the original PIC16C622) and eight-level hardware stack.
Key features include a two-level hardware stack (the 'A' revision extends to eight levels), direct/indirect/relative addressing modes, 12-bit-wide instructions with an 8-bit-wide data path, an integrated power-on reset, watchdog timer, and a brown-out detect circuit. The device supports both internal and external oscillator modes and includes a capture/compare/PWM module plus an 8-bit timer/counter, enabling timer-driven sequencing, event capture, and pulse-width-modulated outputs. The industrial-grade 'I' temperature range covers -40°C to +85°C.
Typical applications span consumer appliance controllers, simple sensor signal conditioning front-ends, low-cost remote controls, automotive interior modules (non-safety), battery chargers, and general-purpose embedded control where deterministic single-cycle instruction execution and a minimal instruction set are valued. The wide 2.5 V to 6.25 V supply tolerance also makes the part practical for 3.3 V and 5 V mixed-rail systems.
Designers should plan for a brown-out-reset capacitor on the MCLR/Vpp pin and account for the 200 ns instruction cycle when computing loop timing. Because the part is OTP, firmware must be fully validated before programming. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes that complement the manufacturer datasheet.
Drop-in alternatives for PIC16LC622A-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 PIC16LC622A-04I/SS (same form factor and footprint) — differing in Core Architecture, Operating Temperature Range, Package, I/O Pins, Program Memory Size.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16LC622A-04E/SS
✅ Drop-In✓ In Stock
$2.42 / Unit
View Datasheet →PIC16LC622-04/SS
✅ Drop-In✓ In Stock
$1.28 / Unit
View Datasheet →PIC16LC622-04I/SS
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
PIC16LC621A-04I/SS
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
PIC16F628A-I/SS
✅ Drop-In✓ In Stock
$1.41 / Unit
View Datasheet →PIC16LC622A-04I/SS Maximum Ratings & Electrical Characteristics
| Product Type | 8-bit Microcontroller (MCU) |
| Core Architecture | PIC16C RISC |
| Family | PIC16LC62x |
| CPU Speed | 4 MHz (max 20 MHz clock input) |
| Program Memory | 3.5 KB (2K x 14) OTP |
| Data RAM | 128 bytes |
| I/O Pins | 13 |
| Supply Voltage | 2.5 V to 6.25 V |
| Operating Temperature | -40°C to +85°C (Industrial 'I' grade) |
| Instruction Set | 35 single-cycle instructions |
| Instruction Cycle | 200 ns (at 20 MHz) |
| Hardware Stack | 8-level (A revision) |
| Timer/Counters | 1 x 8-bit (TMR0) plus Watchdog Timer |
| Capture/Compare/PWM | Yes (CCP module) |
| Brown-out Detect | Yes |
| Package | 20-SSOP (5.30 mm body, 0.65 mm pitch) |
| Mounting Type | Surface Mount |
| ROM Type | OTP (One-Time Programmable) |
| Lead-Free / RoHS | Yes (per current distributor listings) |
PIC16LC622A-04I/SS Pin Configuration
| Pin 1 | RA2/AN2 — Digital I/O port A bit 2 / analog input 2 |
| Pin 2 | RA3/AN3 — Digital I/O port A bit 3 / analog input 3 / Vref+ |
| Pin 3 | RA4/T0CKI — Digital I/O port A bit 4 / Timer0 clock input |
| Pin 4 | MCLR/Vpp — Master clear (reset) / programming voltage input |
| Pin 5 | VSS — Ground reference |
| Pin 6 | RB0/INT — Digital I/O port B bit 0 / external interrupt |
| Pin 7 | RB1 — Digital I/O port B bit 1 |
| Pin 8 | RB2 — Digital I/O port B bit 2 |
| Pin 9 | RB3 — Digital I/O port B bit 3 |
| Pin 10 | RB4 — Digital I/O port B bit 4 |
| Pin 11 | RB5 — Digital I/O port B bit 5 |
| Pin 12 | RB6 — Digital I/O port B bit 6 |
| Pin 13 | RB7 — Digital I/O port B bit 7 |
| Pin 14 | VDD — Positive supply voltage |
| Pin 15 | OSC2/CLKOUT — Oscillator output / clock out |
| Pin 16 | OSC1/CLKIN — Oscillator input / external clock in |
| Pin 17 | RA0/AN0 — Digital I/O port A bit 0 / analog input 0 |
| Pin 18 | RA1/AN1 — Digital I/O port A bit 1 / analog input 1 |
| Pin 19 | RC0 — Digital I/O port C bit 0 |
| Pin 20 | RC1 — Digital I/O port C bit 1 |
Typical Applications
PIC16LC622A-04I/SS is suitable for 7 applications: Consumer Appliance Control, Battery-Powered Remote Control, Automotive Interior Module, Industrial Sensor Front-End, Smart Home Sensor Node, Battery Charger Controller, Educational Embedded Trainer.
Consumer Appliance Control
The PIC16LC622A-04I/SS fits consumer appliance controllers (coffee makers, washing-machine sub-boards, microwave keypads) because it delivers deterministic single-cycle instruction execution at 4 MHz, runs from a wide 2.5 V to 6.25 V supply that accepts both 3.3 V and 5 V rails, and provides 13 GPIO pins to scan keypads and drive relay triacs. Its integrated brown-out detect and watchdog timer protect against supply droop and firmware lockup during long unattended operation. Compared to a discrete logic implementation, the PIC16LC622A cuts component count dramatically and enables field firmware updates via the OTP programming interface. The 200 ns instruction cycle allows bit-banged IR remote protocols and low-speed serial communication without a dedicated UART.
Recommended
Battery-Powered Remote Control
The PIC16LC622A-04I/SS is well suited to handheld IR or RF remote controls because the LC low-power CMOS process minimizes quiescent current, and the 2.5 V to 6.25 V supply range lets the same hardware accept a single CR2032 lithium cell (3.0 V) or two alkaline AA cells (3.0 V). Sleep mode plus the watchdog timer allow event-driven wake-up on key press, extending battery life into years. With 3.5 KB of OTP program memory, manufacturers can encode complex button matrices, device pairing tables, and rolling-code security sequences. The 13 GPIO pins easily handle a 4-by-5 key matrix, status LEDs, and an IR LED driver transistor.
Recommended
Automotive Interior Module
Although not AEC-Q100 qualified, the PIC16LC622A-04I/SS industrial -40°C to +85°C temperature range handles non-safety interior automotive modules such as ambient lighting controllers, seat-position memory switches, and HVAC mode selectors. The wide 2.5 V to 6.25 V supply tolerates automotive load-dump transients when paired with a TVS diode and bulk capacitor. The integrated CCP module generates the PWM dimming signal for LED backlighting, and the 8-bit timer/counter handles switch-debounce timing. Compared to a small CPLD, the PIC16LC622A simplifies logic and adds analog-friendly features like brown-out detect and watchdog timer.
Recommended
Industrial Sensor Front-End
The PIC16LC622A-04I/SS can act as a low-cost sensor signal-conditioning front-end in industrial installations: read a 4-20 mA loop or thermistor with the on-chip comparators, scale the result, and output a digital pulse train via the CCP module. The 200 ns instruction cycle makes 10 ms control loops trivial, and the 3.5 KB OTP memory holds calibration tables and Modbus-RTU frame builders. The industrial temperature range and brown-out reset ensure reliable operation on factory 24 V rails stepped down to 5 V. Compared with a pure analog front-end, the PIC16LC622A adds digital linearization and self-test capability.
Recommended
Smart Home Sensor Node
In a low-cost smart-home sensor node (door/window contact, leak detector, occupancy beacon), the PIC16LC622A-04I/SS consumes very little current in sleep mode and can be wake-cycled by the watchdog timer or an external interrupt on a GPIO. With only 128 bytes of RAM and 3.5 KB of program memory, the firmware must stay lean - exactly what an event-driven beacon or one-wire protocol driver needs. The 13 GPIO pins handle a reed switch, a piezo buzzer, and an LED indicator without an external I/O expander. Compared with a wireless SoC, the PIC16LC622A separates the MCU from the radio, allowing designers to swap radios without rewriting the application code.
Recommended
Battery Charger Controller
The PIC16LC622A-04I/SS can be programmed as a multi-chemistry charger controller (NiMH, Li-ion, lead-acid) using the on-chip 8-bit timer to generate PWM drive to a buck converter's MOSFET gate, and the ADC-free comparator block for current sensing through a sense resistor. The 200 ns instruction cycle supports 50 kHz switching frequencies with simple state-machine code. The 3.5 KB OTP memory fits complex CC-CV charge profiles and temperature-derating tables. The industrial -40°C to +85°C range and brown-out detector suit outdoor solar-charge applications where the MCU may be cold-soaked at dawn.
Recommended
Educational Embedded Trainer
The PIC16LC622A-04I/SS is a popular training MCU in university embedded-systems courses because its 35-instruction RISC core is small enough to teach in a single semester, yet powerful enough to demonstrate timers, interrupts, capture/compare, and EEPROM emulation. The 20-SSOP package is breadboard-friendly when paired with an SSOP-to-DIP breakout board. The 200 ns instruction cycle lets students observe real-time waveform generation with an oscilloscope. Compared to more modern ARM Cortex parts, the PIC16LC622A forces students to learn register-level programming and bit manipulation rather than relying on abstraction layers.
Recommended
Recommended Products Summary
Engineering reference data for PIC16LC622A-04I/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16LC622A-04E/SS | PIC16LC622-04/SS | PIC16LC622-04I/SS | PIC16LC621A-04I/SS | PIC16F628A-I/SS |
|---|---|---|---|---|---|---|
| Package | 20-SSOP | 20-SSOP - same | 20-SSOP - same | 20-SSOP - same | 20-SSOP - same | 20-SSOP - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory | 3.5 KB (2K x 14) OTP | 3.5 KB (2K x 14) OTP | 2 KB (1K x 14) OTP (-50%) | 2 KB (1K x 14) OTP (-50%) | 2 KB (1K x 14) OTP (-50%) | 3.5 KB flash (re-programmable) |
| RAM | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 224 bytes (+75%) |
| Max CPU Clock | 4 MHz (20 MHz input) | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 20 MHz |
| Supply Voltage | 2.5 V to 6.25 V | 2.5 V to 6.25 V | 2.5 V to 6.25 V | 2.5 V to 6.25 V | 2.5 V to 6.25 V | 2.0 V to 5.5 V |
| Temperature Range | -40°C to +85°C (Industrial) | 0°C to +70°C (Commercial) | 0°C to +70°C (Commercial) | -40°C to +85°C (Industrial) | -40°C to +85°C (Industrial) | -40°C to +85°C (Industrial) |
| Memory Type | OTP | OTP | OTP | OTP | OTP | Flash (re-programmable) |
| CCP / PWM | Yes (1 CCP) | Yes (1 CCP) | Yes (1 CCP) | Yes (1 CCP) | No | Yes (1 CCP) + USART |
Key Differentiators
- Wide 2.5 V to 6.25 V supply tolerance bridges 3.3 V and 5 V rails (vs PIC16F628A-I/SS)
- Doubled program memory over the legacy non-A silicon (vs PIC16LC622-04/SS)
- Industrial -40°C to +85°C temperature grade for harsh environments (vs PIC16LC622A-04E/SS)
- Integrated brown-out detect and watchdog timer reduce external parts (vs PIC16LC621A-04I/SS)
Design Notes
The PIC16LC622A-04I/SS operates from 2.5 V to 6.25 V, but in-rush current during supply ramp can cause spurious brown-out events. Place a 0.1 µF ceramic decoupling capacitor within 5 mm of the VDD pin and add a 10 µF tantalum or aluminum bulk capacitor on the supply rail. For battery applications, a series ferrite bead plus 10 µF cap reduces voltage transients when the radio load turns on. Estimated: at 4 MHz CPU and all 13 I/O pins sourcing 5 mA, the device draws about 5 mA - well within the LDO's 250 mA rating.
Because PIC16LC622A-04I/SS is OTP, firmware bugs cannot be patched in-circuit - every unit with a fault must be discarded. Microchip strongly recommends prototyping with the PIC16LC622A-04I/JW (UV-erasable windowed CERDIP) variant or the PIC16F628A-I/SS flash-based pin-compatible variant, then switching to OTP for production. The MCLR/Vpp pin requires a 10 kΩ pull-up to VDD and a 100 nF capacitor to ground for clean reset behavior; omitting the cap allows voltage noise to trigger false resets.
Route the OSC1/OSC2 traces as short as possible and keep them away from high-current switching nodes. For a 4 MHz crystal, load capacitance is typically 15-22 pF on each side per the Microchip datasheet. Place a ground guard ring around the oscillator to reduce EMI. The MCLR/Vpp pin must remain accessible for in-circuit programming - do not route it to a connector that blocks the programmer probe. The 20-SSOP package has a 0.65 mm lead pitch; ensure solder paste stencil apertures are 0.5 mm wide for reliable reflow.
PORTB pins on the PIC16LC622A-04I/SS have weak internal pull-ups that can be individually enabled in software - useful for switch-matrix scanning without external resistors. However, these pull-ups are not strong enough to drive LEDs or relays directly; always use a buffer transistor. The CCP PWM output has a limited slew rate - to drive a power MOSFET gate through a long trace, add a 10 Ω series resistor at the PIC pin to dampen ringing. Estimated: at 50 kHz PWM with 50% duty, average pin current is 5 mA - well within the 25 mA per-pin source/sink rating.
Compliance Information
RoHS compliant per current Microchip product listings. Not AEC-Q100 qualified - not suitable for safety-critical automotive applications. REACH status is per Microchip product declarations; halogen-free status not explicitly stated in distributor data.
