PIC16LC622T-04E/SS - 8-Bit 4MHz OTP MCU 3.5KB | Microchip
MPN: PIC16LC622T-04E/SS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.2 | $4.20 |
| 10 | $3.85 | $38.50 |
| 100 | $3.4 | $340.00 |
| 500 | $2.95 | $1,475.00 |
| 1,000 | $2.6 | $2,600.00 |
PIC16LC622T-04E/SS Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and peripherals such as timers, ADC, and communication interfaces. The PIC16C/PIC16LC family belongs to the 8-bit microcontroller hierarchy, which sits within the broader embedded-microcontroller category (8-bit MCU -> microcontroller -> embedded processor -> semiconductor). OTP variants allow one-time programming via a device programmer and offer the lowest unit cost for high-volume production where firmware is fixed.
Key features include 12 I/O pins (13 in some datasheet characterizations), an 8-bit timer/counter, watchdog timer (WDT) with on-chip RC oscillator, power-on reset (POR), brown-out reset (BOR), and a 2-level deep hardware stack. The RISC instruction set of 35 single-word instructions enables efficient code density, with Harvard architecture separating program and data buses for predictable execution.
The PIC16LC622T-04E/SS uses CMOS process technology for low power consumption and integrates a 4 MHz internal/external clock option. The 'T' suffix indicates Tape & Reel packaging for surface-mount production, while 'SS' designates the SSOP-20 (209-mil) package, and the 'E' indicates the Enhanced (industrial, -40C to +125C) operating temperature range.
Typical applications include consumer electronics (remote controls, small appliances), industrial control modules (sensor interfaces, low-end motor control), automotive body electronics (non-safety subsystems), white goods (washing machines, dishwashers), and battery-powered devices where 0.4 mA typical operating current extends battery life. The wide supply range also makes it suitable for both 3.3 V and 5 V designs.
When designing with this MCU, observe that OTP memory cannot be re-programmed in-circuit; prototype with the windowed (UV-erasable) PIC16CR622 or the flash-based PIC16F622 before committing to OTP. A decoupling capacitor of 0.1 uF placed within 5 mm of VDD is mandatory for noise immunity, and unused I/O pins should be configured as outputs to minimize current draw.
This page synthesizes distributor pricing, lifecycle status, drop-in same-package alternatives, and engineering design notes that complement but do not replace the manufacturer datasheet.
Drop-in alternatives for PIC16LC622T-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 PIC16LC622T-04E/SS (same form factor and footprint) — differing in Program Memory Size, Core Architecture, Package, Program Memory Type, Watchdog Timer.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16LC622A-04E/SS
✅ Drop-In✓ In Stock
$2.42 / Unit
View Datasheet →PIC16LC621AT-04E/SS
✅ Drop-In✓ In Stock
$2.19 / Unit
View Datasheet →PIC16LC620A-04E/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16F622-I/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C622-04/SS
✅ Drop-In✓ In Stock
$1.18 / Unit
View Datasheet →PIC16LC622T-04E/SS Maximum Ratings & Electrical Characteristics
| Core Processor | PIC |
| Core Size | 8-Bit |
| Series | PIC 16C |
| Speed | 4 MHz |
| Program Memory Size | 3.5 KB (2K x 14) OTP |
| RAM Size | 128 x 8 bytes |
| Program Memory Type | OTP (One-Time Programmable) |
| Number of I/O | 13 |
| Supply Voltage (Vcc/Vdd) | 2.5 V to 6.0 V |
| Operating Temperature | -40C to +125C (Enhanced, 'E') |
| Package / Case | 20-SSOP (0.209", 5.30 mm Width) |
| Mounting Type | Surface Mount |
| Packaging | Tape & Reel (TR) |
| Peripherals | Brown-out Detect/Reset, POR, WDT |
| Oscillator Type | External |
| Connectivity | - |
| RoHS Status | Non-compliant (legacy OTP) |
PIC16LC622T-04E/SS Pin Configuration
| Pin 1 | RA2 — Bidirectional I/O pin / analog channel |
| Pin 2 | RA3 — Bidirectional I/O pin / MCLR input |
| Pin 3 | RA4/T0CKI — Bidirectional I/O pin / Timer0 clock input |
| Pin 4 | RA5 — Bidirectional I/O pin |
| Pin 5 | VSS — Ground reference |
| Pin 6 | RB0/INT — Bidirectional I/O pin / external interrupt |
| Pin 7 | RB1 — Bidirectional I/O pin |
| Pin 8 | RB2 — Bidirectional I/O pin |
| Pin 9 | RB3 — Bidirectional I/O pin |
| Pin 10 | RB4 — Bidirectional I/O pin / interrupt-on-change |
| Pin 11 | RB5 — Bidirectional I/O pin / interrupt-on-change |
| Pin 12 | RB6 — Bidirectional I/O pin / interrupt-on-change |
| Pin 13 | RB7 — Bidirectional I/O pin / interrupt-on-change |
| Pin 14 | VDD — Positive supply voltage (2.5V-6.0V) |
| Pin 15 | OSC2/CLKOUT — Oscillator output / clock output |
| Pin 16 | OSC1/CLKIN — Oscillator input / external clock input |
| Pin 17 | RA0 — Bidirectional I/O pin / analog channel |
| Pin 18 | RA1 — Bidirectional I/O pin / analog channel |
| Pin 19 | RA6 — Bidirectional I/O pin |
| Pin 20 | RA7 — Bidirectional I/O pin |
Typical Applications
PIC16LC622T-04E/SS is suitable for 6 applications: Consumer Remote Controls, Small Appliance Control, Industrial Sensor Interfaces, Battery-Powered Devices, Automotive Body Electronics, LED Display Drivers.
Consumer Remote Controls
The PIC16LC622T-04E/SS fits consumer infrared remote controls because its 3.5 KB OTP memory easily stores fixed button-scan matrices and IR transmission protocols (RC-5, NEC, SIRC). The 4 MHz clock delivers deterministic timing critical for carrier generation (typically 36-40 kHz). At 2.5V-6.0V supply, the MCU runs directly from two AAA cells via a boost converter or a single CR2032. Sleep current under 1 uA extends battery life to multi-year standby. Compared to a flash MCU, the OTP variant reduces unit cost by 15-30% at high volume, making it ideal for sub-$5 remotes shipped in tens of millions annually.
Recommended
Small Appliance Control
The PIC16LC622T-04E/SS is well-suited for small appliance controllers (coffee makers, toasters, blenders) where its 13 I/O pins drive LED indicators, relay coils, and read membrane keypads. The brown-out reset prevents unsafe operation during brown-out events when motors draw high inrush current. Industrial -40C to +125C temperature range handles under-hood or near-heater mounting. OTP memory secures proprietary firmware in cost-sensitive white goods. Hardware multiply and Harvard architecture give fast deterministic loop times for TRIAC phase-angle control.
Recommended
Industrial Sensor Interfaces
The PIC16LC622T-04E/SS handles simple industrial sensor conditioning and alarm tasks, with 13 I/O reading switches, thermistors, or 4-20 mA loop signals via external signal conditioning. Its 4 MHz instruction rate handles polling loops and threshold comparisons with deterministic response. Wide 2.5V-6.0V supply simplifies integration with 24V industrial rails after buck regulation. Brown-out detection prevents false alarms from supply glitches. The SSOP-20 package fits compact DIN-rail modules.
Recommended
Battery-Powered Devices
The PIC16LC622T-04E/SS excels in battery-powered applications because its 'LC' low-voltage CMOS process delivers typically 0.4 mA active current at 4 MHz and under 1 uA sleep current. The 2.5V minimum supply allows operation from a single lithium coin cell near end-of-life. Watchdog timer with internal RC oscillator eliminates external watchdog components, saving board space and cost. Applications include wireless sensor nodes, electronic shelf labels, and medical pill-bottle reminders. OTP memory prevents firmware tampering.
Recommended
Automotive Body Electronics
The PIC16LC622T-04E/SS targets non-safety automotive body modules such as interior lighting controllers, seat-position memory switches, and door-lock receivers. Its -40C to +125C operating range covers under-dash and door-module thermal environments. Brown-out and power-on reset handle the load-dump transients common in 12V vehicle systems when paired with proper TVS protection. The OTP memory locks calibration constants that vary per vehicle trim. Engineers should add the Q-grade variant for AEC-Q100 compliance in production.
Recommended
LED Display Drivers
The PIC16LC622T-04E/SS drives multiplexed 7-segment or dot-matrix LED displays via direct GPIO current sinking (each pin rated 25 mA sink). Software multiplexing at 4 MHz easily refreshes 8-digit displays at >100 Hz without flicker. The 3.5 KB OTP holds font tables and animation sequences for digital clocks, counters, and price tags. Industrial temperature range supports outdoor signage. Compared to dedicated LED driver ICs, the MCU approach adds flexibility for custom fonts and effects.
Recommended
Recommended Products Summary
Engineering reference data for PIC16LC622T-04E/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16LC622A-04E/SS | PIC16LC621AT-04E/SS | PIC16LC620A-04E/SS | PIC16F622-I/SS | PIC16C622-04/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 OTP | 3.5 KB OTP | 1.75 KB OTP | 0.875 KB OTP | 3.5 KB Flash | 3.5 KB OTP |
| Max Clock Speed | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 20 MHz | 4 MHz |
| Supply Voltage | 2.5V to 6.0V | 2.5V to 6.0V | 2.5V to 6.0V | 2.5V to 6.0V | 2.0V to 5.5V | 4.5V to 5.5V |
| RAM | 128 bytes | 128 bytes | 96 bytes | 64 bytes | 128 bytes | 128 bytes |
| Memory Type | OTP | OTP | OTP | OTP | Flash | OTP |
| I/O Pins | 13 | 13 | 13 | 13 | 13 | 13 |
| Lifecycle | Active (legacy OTP) | Active | Active | Active | Active (recommended) | Obsolete |
Key Differentiators
- Lowest-cost 8-bit OTP MCU in PIC16 family with enhanced silicon (vs PIC16F622-I/SS)
- Wider supply voltage (2.5V-6.0V) than original PIC16C622 (vs PIC16C622-04/SS)
- A-step silicon with corrected errata (vs PIC16LC622-04/SS)
Design Notes
Place a 0.1 uF ceramic decoupling capacitor within 5 mm of the VDD pin (pin 14) to suppress digital switching noise. For designs with analog references, add a 10 uF bulk capacitor near VDD. The PIC16LC622's supply range of 2.5V-6.0V allows direct connection to a single lithium cell or two AA cells. If using a switching regulator for system power, add a 10 ohm resistor in series with VDD plus a 10 uF capacitor to filter switching noise. Brown-out reset should be enabled in the configuration word for battery-operated designs.
The SSOP-20 package has 0.65 mm pitch leads requiring solder-pad openings of 0.4 mm with 0.1 mm solder mask dam. Use a 4-layer PCB with dedicated ground plane for designs switching >1 MHz signals. Keep crystal or external clock traces shorter than 10 mm to prevent ringing. Decoupling capacitors should connect to the ground plane via short vias placed within 2 mm of the capacitor pad.
OTP memory cannot be erased or re-written; a programming error permanently destroys the part. Always program a known-good prototype using the flash-based PIC16F622-I/SS before committing to OTP production. The configuration word (especially oscillator selection and watchdog timer enable) must be set correctly or the MCU will be bricked. Unused I/O pins should be configured as outputs and tied low to minimize current draw. Ensure the MCLR pin (RA3) has a proper pull-up if not used as I/O.
The PIC16LC622 has 25 mA source/sink capability per I/O, but the total chip dissipation must not exceed 800 mW. When driving multiple LEDs, calculate total current and verify against the package thermal limit. For interrupt-driven designs, ensure that interrupt latency (4 clock cycles) plus ISR execution time fits within the worst-case timing budget. Use the hardware interrupt-on-change feature on PORTB<7:4> for low-latency wake-from-sleep on user input.
Compliance Information
Legacy OTP PIC16LCxxx family uses SnPb (lead-tin) solder finish and is non-RoHS compliant per Microchip legacy product line. Choose the PIC16F622-I/SS for RoHS-compliant designs. AEC-Q100 qualification is not available; select automotive-grade PIC16F722-I/SS variants for vehicle applications.
