PIC16LC622-04E/SS - 4MHz 8-Bit EPROM MCU 20-SSOP | Microchip
MPN: PIC16LC622-04E/SS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.9 | $5.90 |
| 10 | $5.3 | $53.00 |
| 100 | $4.72 | $472.00 |
| 500 | $4.25 | $2,125.00 |
| 1,000 | $3.8 | $3,800.00 |
PIC16LC622-04E/SS Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (ROM/EPROM/flash), data RAM, and peripheral I/O on one die, executing instructions stored in non-volatile memory and manipulating variables in scratchpad RAM. The PIC16C/LC family sits in the broader taxonomy: 8-bit microcontroller -> microcontroller -> embedded processor -> semiconductor IC. The 'LC' variant denotes the low-voltage CMOS process, optimized for battery and energy-constrained applications where the standard PIC16C would exceed its minimum VDD.
Key features include 35 single-cycle instructions with 200 ns instruction cycle time at 20 MHz oscillator, a two-level deep hardware stack, and direct/indirect/relative addressing. Integrated peripherals comprise Brown-out Detect/Reset (BOD), Power-On Reset (POR), and Watchdog Timer (WDT) with its own on-chip RC oscillator for reliable operation without external supervision. Seven or eight special-function hardware registers give the part the deterministic interrupt response that defines PIC architecture.
Architecturally, the PIC16LC622 uses a 12-bit wide instruction word and an 8-bit data path with a Harvard topology that fetches instruction and data in a single cycle, which is the source of its 200 ns cycle performance at 20 MHz. The OTP EPROM memory allows factory or field programming for small-to-medium volume production where flash reprogrammability is not required.
Typical applications include low-power remote sensors, automotive body electronics, appliance controls, security keypads, and simple human-machine interface panels where deterministic response, low quiescent current, and small footprint outweigh the absence of in-system reprogrammability.
When designing with this part, ensure VDD decoupling of 100 nF close to the pin, and note that the OTP windowed ('JW') package variant must be exposed to UV for erase - production boards should specify the OTP-only SSOP variant. The 'E' suffix denotes the industrial operating temperature range.
This page synthesizes distributor stock data, same-package drop-in alternatives (including the PIC16LC622A upgrade), and practical design notes not found in the standalone manufacturer datasheet.
Drop-in alternatives for PIC16LC622-04E/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 PIC16LC622-04E/SS (same form factor and footprint) — differing in Program Memory Size, Core Architecture, Operating Temperature Range, Program Memory Type, Instruction Width.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16LC622A-04E/SS
✅ Drop-In✓ In Stock
$2.42 / Unit
View Datasheet →PIC16LC622-04E/SO
✅ Drop-In✓ In Stock
$1.21 / Unit
View Datasheet →PIC16LC621AT-04I/SS
✅ Drop-In✓ In Stock
$2.46 / Unit
View Datasheet →PIC16LC620AT-04I/SS
✅ Drop-In✓ In Stock
$1.18 / Unit
View Datasheet →PIC16LC621A-04I/P
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$1.01 / Unit
View Datasheet →PIC16LC622-04E/SS Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC 8-bit (Harvard, RISC) |
| Family | PIC16C (PIC16LC622 subfamily) |
| Program Memory Size | 3.5 KB (2K x 14), OTP EPROM |
| Data RAM | 128 bytes |
| Maximum Clock Speed | 4 MHz |
| Maximum Oscillator Frequency | 20 MHz (200 ns instruction cycle) |
| Supply Voltage (VDD) | 2.5 V to 6.25 V |
| I/O Pins | 13 |
| Instruction Set Size | 35 instructions, all single-cycle |
| Hardware Stack | 2-level deep |
| Peripherals | Brown-out Detect/Reset, Power-On Reset, Watchdog Timer |
| Timers | 1 x 8-bit, 1 x 16-bit (per datasheet family) |
| Interrupt Sources | Per datasheet family (typically 4 sources) |
| Package | 20-pin SSOP (5.30 mm / 0.209 in body width) |
| Operating Temperature Range (E suffix) | -40C to +125C (industrial) |
| Mounting Type | Surface Mount |
PIC16LC622-04E/SS Pin Configuration
| Pin 1 | RA2 — Port A bit 2 (bidirectional I/O) |
| Pin 2 | RA3 — Port A bit 3 (input only) |
| Pin 3 | RA4 — Port A bit 4 (open-drain output) |
| Pin 4 | RA5 — Port A bit 5 (bidirectional I/O) |
| Pin 5 | GND — Ground reference |
| Pin 6 | RB0 — Port B bit 0 (external interrupt capable) |
| Pin 7 | RB1 — Port B bit 1 |
| Pin 8 | RB2 — Port B bit 2 |
| Pin 9 | RB3 — Port B bit 3 |
| Pin 10 | RB4 — Port B bit 4 (interrupt-on-change) |
| Pin 11 | RB5 — Port B bit 5 (interrupt-on-change) |
| Pin 12 | RB6 — Port B bit 6 (ICSP clock / interrupt-on-change) |
| Pin 13 | RB7 — Port B bit 7 (ICSP data / interrupt-on-change) |
| Pin 14 | VDD — Positive supply voltage (2.5-6.25 V) |
| Pin 15 | OSC2 — Oscillator output / CLKOUT |
| Pin 16 | OSC1 — Oscillator input / CLKIN |
| Pin 17 | RA0 — Port A bit 0 |
| Pin 18 | RA1 — Port A bit 1 |
| Pin 19 | VDD — Positive supply voltage (second VDD pin) |
| Pin 20 | MCLR/VPP — Master Clear reset (active low) / Programming voltage |
Typical Applications
PIC16LC622-04E/SS is suitable for 6 applications: Low-Power Remote Sensor Node, Automotive Body Electronics, Security Keypad / Access Panel, Home Appliance Control Board, Industrial Process Indicator, Toys and Consumer Gadgets.
Low-Power Remote Sensor Node
The PIC16LC622-04E/SS's 2.5 V minimum VDD and PIC16LC low-voltage CMOS process make it a strong fit for battery-powered remote sensors that need to wake periodically, sample, and return to sleep. At 4 MHz and 2.5 V VDD, the core draws a fraction of the current of a 5 V PIC16C, extending battery life in unattended deployments. The 13 GPIO pins accept the I2C/SPI sensor interface plus interrupt lines, while the integrated WDT guards against firmware lockup when the radio link fails. Compared with a 32-bit MCU, the 35-instruction RISC core keeps the firmware loop deterministic and the sleep current minimal.
Recommended
Automotive Body Electronics
The 'E' suffix (industrial temperature grade, -40C to +125C) qualifies the PIC16LC622-04E/SS for under-hood and cabin automotive applications such as seat controllers, mirror adjusters, and lamp drivers. The 2.5-6.25 V VDD range tolerates automotive 12 V battery transients after a simple regulator pre-stage. Brown-out Detect and Power-On Reset handle cold-crank and load-dump scenarios gracefully. The 20-SSOP footprint saves board area versus the older 20-PDIP packages, and the OTP EPROM is acceptable for high-volume fixed-function automotive modules.
Recommended
Security Keypad / Access Panel
The PIC16LC622-04E/SS fits 4x4 matrix keypads and PIN-entry panels because its 13 GPIO pins scan a 4x4 matrix (8 lines) plus 3 status LEDs, with two lines left for door relay and tamper switch. The Watchdog Timer prevents a stuck MCU from leaving the door unlocked, and Brown-out Detect guarantees the lock defaults to secure during a power glitch. The OTP memory prevents end-user firmware reverse-engineering, which is a security advantage for access-control applications. Low quiescent current keeps battery-backed panels alive for years.
Recommended
Home Appliance Control Board
Washing machines, dishwashers, microwave ovens, and HVAC zone controllers use PIC16LC622-class MCUs to drive triac outputs, read thermistor inputs, and manage user-interface buttons. The PIC16LC622-04E/SS provides 13 GPIOs sufficient for 7-segment display multiplexing plus 4 relay outputs plus a UART for service diagnostics. The 4 MHz clock and 35-instruction RISC core give a 200 ns instruction cycle that handles 60 Hz zero-cross detection and PID loops in real time. The industrial temperature grade supports the inside-cabinet thermal environment of appliances.
Recommended
Industrial Process Indicator
Panel-mount indicators and simple controllers in factory automation use the PIC16LC622-04E/SS to read 4-20 mA process inputs (via external signal conditioner) and drive 7-segment or LCD displays. The 2.5-6.25 V VDD allows the part to operate from the same 5 V or 3.3 V rail that powers the display. The integrated Watchdog and Brown-out Reset satisfy industrial reliability expectations without external supervisor ICs. The 20-SSOP package is suitable for compact panel designs.
Recommended
Toys and Consumer Gadgets
Cost-sensitive consumer products - electronic toys, simple remote controls, novelty gadgets - adopt the PIC16LC622-04E/SS for its small footprint, integrated peripherals (eliminating external reset ICs), and OTP memory that prevents aftermarket cloning. The 13 GPIOs drive LEDs, sound buzzers, and IR emitters directly without external drivers. Brown-out Detect ensures clean resets when batteries weaken, extending the usable battery life and improving user experience.
Recommended
Recommended Products Summary
Engineering reference data for PIC16LC622-04E/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16LC622A-04E/SS | PIC16LC622-04E/SO | PIC16LC621AT-04I/SS | PIC16LC620AT-04I/SS |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 20-SSOP | 20-SSOP (same) | 20-SOIC 300 mil (larger body) | 20-SSOP (same) | 20-SSOP (same) |
| Program Memory | 3.5 KB (2K x 14) OTP | 3.5 KB OTP | 3.5 KB OTP | 1.75 KB OTP (-50%) | 1 KB OTP (-71%) |
| Data RAM | 128 bytes | 128 bytes | 128 bytes | 96 bytes | 96 bytes |
| Maximum Clock Speed | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz |
| Supply Voltage (VDD) | 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 |
| I/O Pins | 13 | 13 | 13 | 13 | 13 |
| Operating Temperature (E suffix) | -40C to +125C (industrial) | -40C to +125C | -40C to +125C | -40C to +85C (I suffix) | -40C to +85C (I suffix) |
Key Differentiators
- Higher program memory than PIC16LC621A in same footprint (vs PIC16LC621AT-04I/SS)
- Industrial temperature grade vs industrial grade I-suffix parts (vs PIC16LC621AT-04I/SS)
- Drop-in upgrade path to refined silicon with same die footprint (vs PIC16LC622A-04E/SS)
Design Notes
Place a 100 nF ceramic decoupling capacitor as close as possible to the VDD pin (pin 14) and a second 100 nF capacitor near pin 19 if the datasheet shows two VDD pins. For battery-powered designs, place a bulk capacitor (10 uF or larger) at the regulator output to hold VDD above the Brown-out Detect threshold during high-current transients such as RF transmission or motor commutation.
Estimated: at 4 MHz with all GPIO switching, total current draw is in the low single-digit mA range. A small copper pour tied to GND under the SSOP body helps dissipate the ~100 mW worst-case power. Keep the MCLR/VPP trace short and add a 10 kohm pull-up to VDD to prevent spurious resets from EMI - critical in industrial and automotive environments.
The OTP EPROM cannot be erased in-circuit - if your firmware has bugs, the chip must be discarded and replaced. For prototypes and field-updateable products, choose the PIC16F882-I/SS or PIC16F883-I/SS in the same 20-SSOP footprint instead. MCLR/VPP must be left floating or pulled to VDD - never leave it unconnected, as the chip will randomly reset.
Compliance Information
RoHS, REACH, and lead-free compliance status was not present in the verified distributor or datasheet excerpts supplied with this product record. Microchip product page or distributor environmental disclosures should be consulted for authoritative compliance status. The 'E' suffix is industrial temperature grade (-40C to +125C), not AEC-Q100 automotive qualification.
