PIC16C622A-20E/SO - 8-Bit 20MHz 3.5KB OTP MCU 18-SOIC | Microchip
MPN: PIC16C622A-20E/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.18 | $4.18 |
| 10 | $3.76 | $37.60 |
| 100 | $3.34 | $334.00 |
| 500 | $2.92 | $1,460.00 |
| 1,000 | $2.5 | $2,500.00 |
PIC16C622A-20E/SO Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, memory (ROM/RAM), timers, I/O peripherals, and interrupt logic on one die. The PIC16C family uses a RISC (Reduced Instruction Set Computer) architecture with only 35 single-word instructions, allowing most instructions to execute in a single 200 ns instruction cycle at 20 MHz. MCUs belong to the broader category of microcontrollers -> embedded processors -> semiconductors, and serve as the central control element in countless embedded systems.
Key features of the PIC16C622A include 13 digital I/O pins, an integrated analog comparator module, two 8-bit timers (Timer0, Timer2) and one 16-bit timer (Timer1), a Watchdog Timer with its own on-chip RC oscillator, an 8-bit parallel slave port, and an internal/external interrupt structure. The device operates from 2.5 V to 5.5 V and supports in-circuit serial programming (ICSP) via its RB6/RB7 pins.
The PIC16C622A uses a Harvard architecture with separate program and data buses, an accumulator-based ALU, and a hardware stack 8 levels deep. Its CMOS process yields very low power consumption (typical < 2 mA at 5 V, 4 MHz), and the SLEEP power-down mode reduces quiescent current to the microampere range, making it suitable for battery-backed or energy-conscious designs.
Typical applications include appliance controls, automotive body electronics (non-safety), sensor signal conditioning, LED driving, motor control PWM, low-end remote controls, and industrial metering. The integrated analog comparator is particularly useful for zero-crossing detection, battery voltage monitoring, and sensor threshold detection.
When designing with this part, note that OTP memory can be programmed only once; engineers must commit the firmware before final assembly. Use sockets or adapt the design to a Flash equivalent (PIC16F62x family) for prototyping. Decouple VDD/VSS with a 100 nF ceramic capacitor placed within 5 mm of the package pins, and reserve RB6/RB7 for ICSP to keep in-field firmware updates possible during development.
This page synthesizes distributor pricing across DigiKey, Mouser, LCSC and Hotenda, drop-in same-package alternatives, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for PIC16C622A-20E/SO — 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 PIC16C622A-20E/SO (same form factor and footprint) — differing in Package, Program Memory Size, Program Memory Type, RoHS Status, RAM Size.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C622A-20/SO
✅ Drop-In✓ In Stock
$2.78 / Unit
View Datasheet →PIC16C622A-04I/SO
✅ Drop-In✓ In Stock
$2.72 / Unit
View Datasheet →PIC16C622A-20E/P
✅ Drop-In✓ In Stock
$1.28 / Unit
View Datasheet →PIC16C621A-20E/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C620A-20E/SO
✅ Drop-In✓ In Stock
$1.12 / Unit
View Datasheet →PIC16C621T-20E/SO
✅ Drop-In✓ In Stock
$1.72 / Unit
View Datasheet →PIC16F628A-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C622A-20E/SO Maximum Ratings & Electrical Characteristics
| Manufacturer | Microchip Technology |
| Series | PIC16C |
| Core Processor | PIC |
| Core Size | 8-bit |
| Maximum Clock Frequency | 20 MHz |
| Instruction Cycle Time | 200 ns |
| Program Memory Size | 3.5 KB (2K x 14) OTP |
| RAM Size | 128 bytes |
| EEPROM Size | None (OTP only) |
| Number of I/O Pins | 13 |
| Number of Timers | 3 (Timer0 8-bit, Timer1 16-bit, Timer2 8-bit) |
| Analog Comparators | Yes (integrated) |
| Supply Voltage (Vdd) | 2.5 V to 5.5 V |
| Operating Temperature | -40C to +125C (Extended, -E suffix) |
| Package | 18-SOIC (0.295 inch / 7.50 mm body width) |
| Mounting Type | Surface Mount |
| Program Memory Type | OTP (One-Time Programmable) |
| ICSP (In-Circuit Serial Programming) | Yes (via RB6/RB7) |
| Watchdog Timer | Yes, with dedicated on-chip RC oscillator |
PIC16C622A-20E/SO Pin Configuration
| Pin 1 | RA2 — Bidirectional I/O port A bit 2 |
| Pin 2 | RA3 — Bidirectional I/O port A bit 3 |
| Pin 3 | RA4 — Bidirectional I/O port A bit 4 (also T0CKI clock input) |
| Pin 4 | MCLR/VPP — Master Clear reset input / programming voltage |
| Pin 5 | VSS — Ground reference |
| Pin 6 | RB0/INT — Bidirectional I/O port B bit 0 / external interrupt |
| Pin 7 | RB1 — Bidirectional I/O port B bit 1 |
| Pin 8 | RB2 — Bidirectional I/O port B bit 2 |
| Pin 9 | RB3 — Bidirectional I/O port B bit 3 |
| Pin 10 | RB4 — Bidirectional I/O port B bit 4 |
| Pin 11 | RB5 — Bidirectional I/O port B bit 5 |
| Pin 12 | RB6 — Bidirectional I/O port B bit 6 / ICSP clock |
| Pin 13 | RB7 — Bidirectional I/O port B bit 7 / ICSP data |
| Pin 14 | VDD — Positive supply voltage (2.5 V to 5.5 V) |
| Pin 15 | RC0 — Bidirectional I/O port C bit 0 |
| Pin 16 | RC1 — Bidirectional I/O port C bit 1 |
| Pin 17 | RC2 — Bidirectional I/O port C bit 2 |
| Pin 18 | RC3 — Bidirectional I/O port C bit 3 |
Typical Applications
PIC16C622A-20E/SO is suitable for 6 applications: Appliance Control Board, Automotive Body Electronics (Non-Safety), Industrial Sensor Signal Conditioning, Remote Control and IR Transmitter, LED Lighting Driver Controller, Battery Charger and Power Bank Controller.
Appliance Control Board
The PIC16C622A-20E/SO fits white-goods appliance control boards thanks to its 13 digital I/O pins, 20 MHz CPU throughput (5 MIPS), and -40C to +125C Extended industrial temperature range that survives under-cabinet heat and cold laundry-room environments. In a washing-machine controller, the MCU scans front-panel buttons on PORTB, drives relay coils on PORTC via Darlington arrays, and reads water-level sensors via the integrated analog comparator on RA0/RA1. The 3.5 KB OTP holds fixed appliance firmware (wash-cycle state machine, motor PWM sequences, fault diagnostics), while 128 bytes RAM is ample for runtime flags and timers. Compared with a Flash MCU, the OTP variant undercuts unit cost for high-volume SKUs where firmware never changes after release.
Recommended
Automotive Body Electronics (Non-Safety)
The PIC16C622A-20E/SO is well-suited for non-safety automotive body modules such as interior lighting controllers, mirror-adjust drivers, and seat-position memory switches. Its 2.5 V to 5.5 V supply range accepts the 12 V battery rail after a 5 V regulator, and the Extended -40C to +125C temperature grade tolerates cabin temperatures from sub-zero winter mornings to summer sun-baked dashboards. The integrated analog comparator on RA0/RA1 provides zero-crossing detection for triac-driven courtesy lamps, while PWM on the CCP-equivalent Timer2 output dims map-light LEDs without external driver ICs. OTP memory prevents end-user firmware tampering and protects OEM calibration data. Note: this part is NOT AEC-Q100 qualified - reserve it for non-safety body modules only.
Recommended
Industrial Sensor Signal Conditioning
In industrial sensor-conditioning modules the PIC16C622A-20E/SO serves as a low-cost front-end processor for 4-20 mA loops, thermistor bridges, and optical interrupter arrays. The 20 MHz CPU executes 5 MIPS, enough to run a 10 ms polling loop that reads the analog comparator, scales the reading in software, and outputs a calibrated PWM or UART stream. The 13 I/O pins interface directly to 5 V logic-level sensors without level shifters, and the 2.5 V minimum VDD lets the MCU run off a single Li-ion cell for portable calibrators. OTP memory prevents field tampering with calibration constants - a regulatory plus in metrology applications - while the -40C to +125C grade handles factory-floor thermal stress.
Recommended
Remote Control and IR Transmitter
The PIC16C622A-20E/SO is a classic fit for handheld IR remote controls, garage-door openers, and ceiling-fan controllers thanks to its low BOM count (no external oscillator needed if internal RC is selected in CONFIG), 20 MHz speed for 38 kHz carrier generation, and low-power SLEEP mode that drops quiescent current to microamp levels for years of standby on two AAA cells. Timer0 generates the 38 kHz carrier duty cycle while the main loop outputs the protocol bit stream (RC5, NEC, or proprietary) on a single PORTB pin driving an IR LED via a transistor. The 128-byte RAM holds the key-scan matrix and transmit buffer; 3.5 KB OTP accommodates full protocol tables. The /E temperature grade handles garage-door outdoor mounting.
Recommended
LED Lighting Driver Controller
Architectural and decorative LED drivers benefit from the PIC16C622A-20E/SO's combination of 20 MHz PWM resolution, integrated analog comparator for current-sense feedback, and 5 V-tolerant I/O that directly drives logic-level MOSFET gate drivers. The MCU runs a constant-current control loop that reads shunt voltage on RA0/RA1 comparator inputs, adjusts PWM duty on RC2, and synchronizes phase across multiple channels for low-EMI dimming. The Extended temperature range accommodates enclosed LED fixture thermal environments, and OTP memory locks the dimming curve and color-mixing tables so end users cannot modify them. The 18-SOIC package is appropriate for high-density strip-light driver PCBs.
Recommended
Battery Charger and Power Bank Controller
The PIC16C622A-20E/SO is suitable as the supervisor MCU in small single-cell Li-ion charger modules and USB power banks, where its 2.5 V to 5.5 V supply matches the cell voltage range and the integrated analog comparator performs precise end-of-charge voltage detection. The MCU implements CC/CV charge profiles in firmware, displays state on LEDs driven from PORTC, and gates the load FET through a single I/O pin. The Extended -40C to +125C temperature grade handles in-pocket or in-car thermal excursions, and the 3.5 KB OTP holds charger firmware with safety lockouts that cannot be reflashed in the field - a regulatory plus in consumer charging products. Low SLEEP current extends shelf life.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C622A-20E/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C622A-20/SO | PIC16C622A-04I/SO | PIC16C622A-20E/P | PIC16C621A-20E/SO | PIC16F628A-I/SO |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 18-SOIC (0.295 inch) | 18-SOIC (0.295 inch) - same | 18-SOIC (0.295 inch) - same | 18-PDIP - through-hole | 18-SOIC (0.295 inch) - same | 18-SOIC (0.295 inch) - same |
| Maximum Clock Frequency | 20 MHz | 20 MHz | 4 MHz | 20 MHz | 20 MHz | 20 MHz |
| Program Memory | 3.5 KB OTP | 3.5 KB OTP | 3.5 KB OTP | 3.5 KB OTP | 1 KB OTP | 3.5 KB Flash |
| RAM Size | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 224 bytes |
| Memory Type | OTP (one-time programmable) | OTP | OTP | OTP | OTP | Flash (reprogrammable) |
| Operating Temperature | -40C to +125C (Extended) | 0C to +70C (Commercial) | -40C to +85C (Industrial) | -40C to +125C (Extended) | -40C to +125C (Extended) | -40C to +85C (Industrial) |
| Supply Voltage | 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 | 2.0 V to 5.5 V |
Key Differentiators
- Extended industrial temperature range for harsh-environment deployments (vs PIC16C622A-20/SO)
- 3.5 KB OTP program memory for substantial fixed firmware (vs PIC16C621A-20E/SO)
- OTP security against firmware reverse-engineering (vs PIC16F628A-I/SO)
- Faster 20 MHz CPU throughput for timing-critical tasks (vs PIC16C622A-04I/SO)
Design Notes
Estimated: at VDD = 5.0 V, Fosc = 20 MHz, the PIC16C622A-20E/SO typical operating current is approximately 11 mA (datasheet figure 30400D, DC characteristics table). At 3.3 V supply, current drops to roughly 4 mA. Decouple VDD/VSS with a 100 nF X7R ceramic placed within 5 mm of pins 5 (VSS) and 14 (VDD); add a 10 uF bulk capacitor near the regulator. The MCLR pin (pin 4) requires a 10 kohm pull-up to VDD - never leave MCLR floating, as noise on MCLR causes spurious resets. Add a 100 nF cap from MCLR to VSS to filter ESD and switching spikes.
Route the crystal traces (OSC1 pin 15, OSC2 pin 16) short and symmetric, with the load capacitors (typically 15-33 pF) placed within 3 mm of the crystal and grounded to a quiet VSS island. Keep crystal traces away from RB6/RB7 ICSP traces and from any switching-power traces to avoid coupling noise into the clock. Place the ICSP header (5-pin standard: MCLR/VPP, VDD, VSS, RB6/ICSPCLK, RB7/ICSPDAT) on the board edge for in-circuit programming access. Reserve RB6 and RB7 exclusively for ICSP during development; if application I/O is required on those pins, plan for ICSP contention.
OTP memory cannot be erased - once a PIC16C622A-20E/SO is programmed, the firmware is permanent. For prototyping or firmware iteration, use the pin-compatible PIC16F628A-I/SO (Flash) instead. The CONFIG bits must be set explicitly (use __CONFIG in MPASM) to enable the Watchdog Timer disable, internal RC oscillator, and MCLR reset polarity as required. Brown-out Reset (BOR) is not implemented on the PIC16C62X family - implement software brown-out by polling a voltage reference on an analog input. Watchdog Timer postscaler must be cleared via CLRWDT before any blocking delay, otherwise a legitimate long delay will trigger an unintended reset.
For the 18-SOIC (0.295 inch body width), use a 1.27 mm pitch land pattern with a recommended pad width of 0.55 mm and pad length of 1.8 mm to ensure reliable solder fillet formation per IPC-7351 nominal density. Expose a small copper thermal pad under the package center and stitch it to the ground plane with thermal vias to reduce thermal resistance; although the SOIC package has no exposed pad, the GND copper still aids heat spreading. Maintain at least 0.5 mm clearance between SOIC pads and adjacent traces to prevent solder bridges during reflow. A ground pour on the top layer directly under the device body improves EMI and ESD performance.
Compliance Information
RoHS, REACH, lead-free and halogen-free status are not stated in the Verified Web Data; refer to Microchip material declaration documents for definitive compliance certificates. The part is NOT AEC-Q100 qualified - it is suitable for non-safety industrial and commercial applications, not for automotive safety-critical systems. For automotive safety applications, choose an AEC-Q100-qualified alternative such as the PIC16F15325-I/SO.