PIC16LC622A-04E/SO - 8-bit 4MHz OTP MCU 3.5KB | Microchip
MPN: PIC16LC622A-04E/SO β End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.42 | $3.42 |
| 10 | $3.08 | $30.80 |
| 100 | $2.74 | $274.00 |
| 500 | $2.41 | $1,205.00 |
| 1,000 | $2.13 | $2,130.00 |
PIC16LC622A-04E/SO Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (ROM/EPROM/Flash), data RAM, I/O peripherals, and timers onto one die. MCUs sit at the bottom of the compute hierarchy above discrete logic but below microprocessors (MPUs) and microcontrollers with embedded radios (SoCs). The PIC16C family uses a RISC-style Harvard architecture that delivers deterministic instruction timing and very low power consumption, making this category ideal for cost-sensitive, real-time, and battery-powered embedded designs.
Key features include 13 bidirectional I/O pins with individual direction control, a 4 MHz maximum clock input, on-chip oscillator support (RC and crystal modes), a programmable watchdog timer with on-chip RC oscillator, power-saving SLEEP mode, and an operating voltage range compatible with both 3.3V and 5V rails. The 18-SOIC package provides a 7.50 mm body width with a 0.295 inch lead pitch suitable for hand-solderable prototyping as well as high-volume SMT production.
Architecturally, the PIC16LC622A uses a 14-bit instruction word with an 8-bit data path, providing a code density advantage over many 8-bit competitors. The integrated brown-out reset (BOR) circuitry holds the MCU in reset when VDD falls below a programmable threshold, preventing code corruption from indeterminate supply voltage. The 35-instruction RISC core enables rapid development since most applications can be written using only a subset of the instruction set.
Typical applications include appliance control, automotive body electronics, industrial sensor interfaces, remote controls, security and alarm panels, and low-cost consumer electronics. The combination of OTP program memory (cost-optimized for production) and wide voltage tolerance makes this part particularly attractive for high-volume, fixed-function devices where software is finalized and code security is required.
When designing with this part, ensure that the MCLR (master clear) pin has a proper pull-up network for reliable reset behavior and that decoupling capacitors (100 nF ceramic plus bulk) are placed within a few millimeters of the VDD pin. The E suffix denotes the extended industrial temperature grade (-40C to +125C), which must be respected when specifying this part for harsh-environment deployments.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the manufacturer datasheet, providing an information-gain view for procurement and engineering teams.
Drop-in alternatives for PIC16LC622A-04E/SO β 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/SO (same form factor and footprint) β differing in Package, Program Memory Size, Operating Temperature Range, Mounting Type, RoHS Status.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
PIC16LC622A-04I/SO
β Drop-Inπ Reference alternative (not in catalog)
PIC16LC622A-04/SO
β Drop-Inπ Reference alternative (not in catalog)
PIC16LC622AT-04E/SO
β Drop-Inπ Reference alternative (not in catalog)
PIC16F627A-I/SO
β Drop-Inπ Reference alternative (not in catalog)
PIC16F628A-I/SO
β Drop-Inβ In Stock
$2.32 / Unit
View Datasheet βPIC16LC621A-04E/SO
β Drop-Inβ In Stock
$2.25 / Unit
View Datasheet βPIC16LC622A-04E/SO Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC 8-bit RISC (Harvard) |
| Series | PIC16C |
| Program Memory Type | EPROM (OTP) |
| Program Memory Size | 3.5 KB (2K x 14) |
| RAM Size | 128 bytes |
| Maximum Clock Frequency | 4 MHz |
| Instruction Cycle Time | 200 ns (single-cycle) |
| Number of I/O Pins | 13 |
| Operating Voltage Range | 2.5 V to 6.0 V (3.3V/5V nominal) |
| Supply Voltage | 3.3 V or 5 V |
| Operating Temperature Range | -40C to +125C (Extended, "E" suffix) |
| Package | 18-SOIC (0.295 inch / 7.50 mm body width) |
| Mounting Type | Surface Mount |
| Brown-Out Reset (BOR) | Yes |
| Watchdog Timer | Yes (with on-chip RC oscillator) |
| Power-Saving SLEEP Mode | Yes |
| Number of Instructions | 35 |
| RoHS Status | Compliant |
PIC16LC622A-04E/SO Pin Configuration
| Pin 1 | RA2 β Bidirectional I/O port A bit 2 |
| Pin 2 | RA3 β Bidirectional I/O port A bit 3 |
| Pin 3 | RA4/T0CKI β Bidirectional I/O / Timer0 clock input (open-drain) |
| Pin 4 | MCLR/VPP β Master clear reset input / programming voltage |
| Pin 5 | VSS β Ground reference |
| Pin 6 | RB0/INT β Bidirectional I/O port B bit 0 / external interrupt |
| Pin 7 | RB1 β Bidirectional I/O port B bit 1 |
| Pin 8 | RB2 β Bidirectional I/O port B bit 2 |
| Pin 9 | RB3 β Bidirectional I/O port B bit 3 |
| Pin 10 | RB4 β Bidirectional I/O port B bit 4 |
| Pin 11 | RB5 β Bidirectional I/O port B bit 5 |
| Pin 12 | RB6 β Bidirectional I/O port B bit 6 |
| Pin 13 | RB7 β Bidirectional I/O port B bit 7 |
| Pin 14 | VSS β Ground reference |
| Pin 15 | OSC2/CLKOUT β Oscillator output / clock output |
| Pin 16 | OSC1/CLKIN β Oscillator input / external clock input |
| Pin 17 | RA0 β Bidirectional I/O port A bit 0 |
| Pin 18 | RA1 β Bidirectional I/O port A bit 1 |
Typical Applications
PIC16LC622A-04E/SO is suitable for 7 applications: Appliance Control Boards, Automotive Body Electronics, Security and Alarm Panels, Remote Controls and IR Transmitters, Industrial Sensor Interfaces, Consumer Electronics Controllers, HVAC and Thermostat Control.
Appliance Control Boards
The PIC16LC622A-04E/SO fits appliance control boards because its 4 MHz 8-bit RISC core, 3.5 KB OTP program memory, and 13 I/O pins provide enough headroom for relay drivers, sensor multiplexing, and user-interface scanning in washing machines, dishwashers, and microwave ovens. According to the manufacturer datasheet, the brown-out reset and watchdog timer protect against supply brown-outs and firmware lockups common in motor-driven environments, while the 200 ns instruction cycle enables deterministic real-time control of triac-fired loads. Unlike more expensive Cortex-M parts, this MCU keeps BOM cost low for fixed-function white goods.
Recommended
Automotive Body Electronics
The PIC16LC622A-04E/SO serves in automotive body electronics such as lighting controllers, seat position memories, and HVAC blend-door actuators. According to Microchip, the E temperature grade (-40C to +125C) survives under-hood thermal stress, while the 3.3V/5V supply range tolerates load-dump transients when paired with a TVS clamp. The 13 I/O pins handle multiple switch inputs and PWM outputs for LED drivers or DC motor control, and the OTP memory provides code security against unauthorized firmware cloning. Use the PIC16F628A-I/SO for new automotive designs requiring flash reprogrammability.
Recommended
Security and Alarm Panels
The PIC16LC622A-04E/SO is well suited for security and alarm panels because its 3.5 KB OTP memory stores encrypted zone definitions and event logs, while the integrated watchdog timer recovers the MCU from software lockups triggered by ESD or RF injection attempts. According to the manufacturer datasheet, the 13 I/O pins interface directly to PIR sensors, reed switches, keypad matrices, and siren drivers without external glue logic. The low-voltage operation (down to 2.5V) extends battery life in wireless panels, and OTP memory prevents firmware reverse engineering - a key requirement for security products.
Recommended
Remote Controls and IR Transmitters
The PIC16LC622A-04E/SO fits low-cost remote controls because its 4 MHz RISC core executes button-scan and IR-modulation routines with predictable 200 ns timing. According to the manufacturer datasheet, the SLEEP mode drops current consumption to a few microamps, extending battery life on coin cells, and the watchdog timer wakes the MCU from sleep on button press. The 13 I/O pins drive a 4x4 keypad matrix and an IR LED transmitter directly. Migrate to the PIC16F627A-I/SO for designs that need flash reprogramming during product development.
Recommended
Industrial Sensor Interfaces
The PIC16LC622A-04E/SO suits industrial sensor interface modules such as 4-20 mA transmitters, RTD conditioners, and limit-switch aggregators. According to the manufacturer datasheet, the 3.3V/5V supply tolerates 24V industrial rails when paired with a front-end regulator, while the E temperature grade (-40C to +125C) meets harsh-environment specifications. The 35-instruction RISC core implements Modbus RTU or proprietary protocols on a UART bit-banged interface, and the 13 I/O pins connect to multiple sensor channels. The OTP memory locks firmware against field tampering in factory automation deployments.
Recommended
Consumer Electronics Controllers
The PIC16LC622A-04E/SO fits consumer electronics controllers including toys, small appliances, and personal-care devices. According to Microchip, the 4 MHz core and 128 bytes of RAM handle LED animations, button debouncing, and battery management in cost-sensitive form factors. The 13 I/O pins drive RGB LEDs, haptic feedback motors, and capacitive touch pads through external charge/discharge circuitry. OTP program memory secures firmware in mass-market products where cloned hardware is a revenue concern. New designs should target the PIC16F627A-I/SO flash sibling to enable in-field updates.
Recommended
HVAC and Thermostat Control
The PIC16LC622A-04E/SO drives HVAC and thermostat control boards where 13 I/O pins manage temperature sensors, fan relays, and LCD display interfaces. According to the manufacturer datasheet, the E temperature grade (-40C to +125C) operates reliably near heat exchangers and the brown-out reset prevents erroneous HVAC cycling during AC brown-outs. The 35-instruction RISC core executes PID control loops at 200 ns per instruction, providing smooth compressor modulation. For new thermostat designs requiring wireless connectivity, migrate to the PIC16F628A-I/SO and add an external radio module.
Recommended
Recommended Products Summary
Engineering reference data for PIC16LC622A-04E/SO β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16LC622A-04I/SO | PIC16LC622A-04/SO | PIC16F627A-I/SO | PIC16F628A-I/SO | PIC16LC621A-04E/SO |
|---|---|---|---|---|---|---|
| Package | 18-SOIC | 18-SOIC - same | 18-SOIC - same | 18-SOIC - same | 18-SOIC - same | 18-SOIC - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory | 3.5 KB OTP | 3.5 KB OTP | 3.5 KB OTP | 1.75 KB Flash | 3.5 KB Flash | 896 B OTP |
| Memory Type | EPROM (OTP) | EPROM (OTP) | EPROM (OTP) | Flash | Flash | EPROM (OTP) |
| Max Clock Frequency | 4 MHz | 4 MHz | 4 MHz | 20 MHz | 20 MHz | 4 MHz |
| RAM Size | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 224 bytes | 80 bytes |
| I/O Pins | 13 | 13 | 13 | 13 | 13 | 13 |
| Operating Temperature | -40C to +125C | -40C to +85C | 0C to +70C | -40C to +85C | -40C to +85C | -40C to +125C |
| USART | No | No | No | No | Yes | No |
Key Differentiators
- Extended industrial temperature grade (-40C to +125C) (vs PIC16LC622A-04I/SO)
- OTP memory for code security (vs PIC16F627A-I/SO)
- Wide 3.3V/5V dual-rail compatibility (vs PIC16F628A-I/SO)
- Same pinout as modern flash siblings (vs PIC16F628A-I/SO)
Design Notes
The PIC16LC622A-04E/SO requires a 100 nF ceramic decoupling capacitor placed within 5 mm of the VDD pin (pin 16) and a bulk capacitor (>= 10 uF) on the supply rail. The brown-out reset (BOR) module monitors VDD and holds the MCU in reset if supply voltage drops below the programmable threshold; verify BOR voltage matches your minimum operating rail. For battery-powered designs, switch to the PIC16F627A-I/SO flash sibling which offers lower sleep current and flexible BOR trip points.
The MCLR pin (pin 4) MUST be pulled up to VDD through a resistor (typically 10 kOhm) for normal operation; leaving it floating prevents the MCU from starting. The oscillator configuration depends on the CONFIG word - RC mode uses pin 15 as CLKOUT and pin 16 as CLKIN with an external resistor; XT/HS modes require a crystal or resonator between pins 15 and 16. Failure to program the CONFIG word correctly is the most common reason prototypes fail to start.
Route the oscillator traces (pins 15-16) as short as possible and keep them away from high-current switching signals. Place the decoupling capacitor trace stub directly to the VDD pin without sharing vias. For RA4 (pin 3), note that this is an open-drain output requiring an external pull-up resistor if used as a digital output; this is a common source of confusion when migrating from PIC16F parts where RA4 is push-pull.
At 4 MHz operation with 5 V supply, the PIC16LC622A-04E/SO draws approximately 2 mA active current and a few microamps in SLEEP mode. Estimated: junction temperature rise above ambient is negligible (< 1 C/W theta_JA on 18-SOIC) for typical operation, but in sealed enclosures at the upper end of the -40C to +125C operating range, verify thermal dissipation through the copper pours and not just the package leads.
Compliance Information
RoHS compliant per Microchip product page. Not AEC-Q100 qualified - automotive body electronics typically use PIC16F variants with explicit Q-1 grade.