PIC16C622T-20E/SO - 8-Bit 20MHz OTP MCU 3.5KB | Microchip
MPN: PIC16C622T-20E/SO β End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.45 | $3.45 |
| 10 | $3.1 | $31.00 |
| 100 | $2.78 | $278.00 |
| 500 | $2.45 | $1,225.00 |
| 1,000 | $2.15 | $2,150.00 |
PIC16C622T-20E/SO Overview
A microcontroller (MCU) is a single-chip computer containing a CPU core, program memory, working RAM, and peripheral set on one die. OTP MCUs use one-time programmable EPROM cells so firmware is permanently committed during production programming; unlike flash parts, the program memory cannot be rewritten, which historically made OTP devices attractive for cost-sensitive high-volume consumer and industrial control. The PIC16C family sits in the 8-bit RISC hierarchy of Microchip's portfolio, with Harvard architecture, 14-bit-wide instructions, and a small instruction set optimized for deterministic interrupt response and low code size.
Key features of the PIC16C622T-20E/SO include 20 MHz maximum clock, 200 ns instruction cycle, 128 bytes RAM, two on-chip analog comparators, a programmable voltage reference, an internal RC oscillator option, power-on reset, brown-out reset, watchdog timer with on-chip low-power oscillator, in-circuit serial programming (ICSP), and a wide 3.0 V to 6.0 V supply range. The 18-SOIC industrial-grade (-40 Β°C to +125 Β°C) package makes it suitable for harsh environment installations.
Typical applications include appliance control (white goods, HVAC actuators, washing machines), industrial sensor interface boards, low-cost automotive subsystems (non-safety), battery chargers, smart metering front-ends, lighting ballasts, and consumer white goods with analog comparators. The internal comparators can directly interface with sensors, replacing external op-amps in threshold-detection circuits.
When designing with this part, note the OTP program memory requires a mask/OTP programming step at production; use a flash equivalent (PIC16F62x family) during prototyping for code iteration, then port back for cost-down production. Add 0.1 Β΅F + 10 Β΅F decoupling close to VDD/VSS.
Drop-in alternatives for PIC16C622T-20E/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 PIC16C622T-20E/SO (same form factor and footprint) β differing in Package, Timers, Analog Comparator, Core, Data EEPROM.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
PIC16F627-20I/SO
β Drop-Inπ Reference alternative (not in catalog)
PIC16F628-20I/SO
β Drop-Inπ Reference alternative (not in catalog)
PIC16C621-20E/SO
β Drop-Inπ Reference alternative (not in catalog)
PIC16C620-20E/SO
β Drop-Inβ In Stock
$3.3 / Unit
View Datasheet βPIC16C622T-20E/SO Maximum Ratings & Electrical Characteristics
| Manufacturer | Microchip Technology |
| Series | PIC 16C |
| Core Processor | PIC |
| Core Size | 8-bit |
| Maximum Clock Frequency | 20 MHz |
| Instruction Cycle Time | 200 ns (20 MHz, 5 V) |
| Program Memory Size | 3.5 KB (2K x 14) OTP |
| Program Memory Type | OTP EPROM |
| RAM Size | 128 bytes |
| EEPROM Size | 0 bytes |
| Number of I/O Pins | 13 |
| Supply Voltage (VDD) | 3.0 V to 6.0 V |
| Operating Temperature | -40 Β°C to +125 Β°C (TA) |
| On-chip Analog Comparators | 2 |
| Timers | 1 x 8-bit TMR0 with prescaler; WDT with dedicated oscillator |
| Package | 18-SOIC (7.50 mm / 0.295 inch width) |
| Mounting Type | Surface Mount |
| Oscillator Type | External RC/HS/XT/LP; internal RC option |
| Program Memory Type Detail | OTP (One-Time Programmable EPROM) |
| MSL Level | 1 (unlimited floor life, JEDEC J-STD-020) |
| RoHS Status | non_compliant (Pb-containing OTP window) |
| Lead Finish | Matte Tin (Sn) over Ni (Pb-free reflow profile) |
PIC16C622T-20E/SO Pin Configuration
| Pin 1 | RA2/AN2/CVREF β Bidirectional I/O; analog channel 2; comparator voltage reference output |
| Pin 2 | RA3/AN3/C1OUT β Bidirectional I/O; analog channel 3; comparator 1 output |
| Pin 3 | RA4/T0CKI β Bidirectional I/O open-drain; Timer0 clock input |
| Pin 4 | MCLR/VPP β Master clear reset (active low); programming voltage input |
| Pin 5 | VSS β Ground reference |
| Pin 6 | RB0/INT β Bidirectional I/O; external interrupt input |
| Pin 7 | RB1 β Bidirectional I/O |
| Pin 8 | RB2 β Bidirectional I/O |
| Pin 9 | RB3 β Bidirectional I/O |
| Pin 10 | RB4 β Bidirectional I/O; interrupt-on-change |
| Pin 11 | RB5 β Bidirectional I/O; interrupt-on-change |
| Pin 12 | RB6 β Bidirectional I/O; interrupt-on-change; ICSP clock |
| Pin 13 | RB7 β Bidirectional I/O; interrupt-on-change; ICSP data |
| Pin 14 | VDD β Positive supply voltage (3.0 V to 6.0 V) |
| Pin 15 | OSC2/CLKOUT β Oscillator crystal output; CLKOUT for RC mode |
| Pin 16 | OSC1/CLKIN β Oscillator crystal input; external clock input |
| Pin 17 | RA0/AN0 β Bidirectional I/O; analog channel 0; comparator 0 positive input |
| Pin 18 | RA1/AN1 β Bidirectional I/O; analog channel 1; comparator 0 negative input |
Typical Applications
PIC16C622T-20E/SO is suitable for 7 applications: White Goods Appliance Control, Battery Charger Control Board, Smart Meter Front-End, Lighting Ballast Controller, Industrial Sensor Interface Board, Consumer White Goods Remote Keypad, Low-Cost Automotive Subsystem.
White Goods Appliance Control
The PIC16C622T-20E/SO fits washing machine, dishwasher, and HVAC actuator control boards where cost-sensitive high-volume production makes OTP memory economically attractive. With 13 I/O pins driving relays, triacs, and seven-segment displays, plus 3.5 KB of program space sufficient for state-machine firmware, the device controls motor start sequences, valve timing, and temperature thresholds. The two on-chip analog comparators handle thermistor / NTC sensor threshold detection directly without external op-amps, simplifying the BOM.
Recommended
Battery Charger Control Board
The PIC16C622T-20E/SO is widely used in low-cost lead-acid and NiMH charger designs where its 3.0-6.0 V supply matches a 4-cell battery stack and OTP memory locks the charging algorithm against firmware tampering. The 20 MHz core runs CC/CV charge loops with PWM output on RB pins, while the analog comparators sense battery voltage and current shunt ends with no external ADC required. Industrial -40 Β°C to +125 Β°C rating supports automotive under-hood and outdoor solar charger enclosures.
Recommended
Smart Meter Front-End
In single-phase electricity meter front-end designs, the PIC16C622T-20E/SO reads current transformer outputs through its on-chip comparators and accumulates consumption pulses with Timer0, then drives an LED or LCD via PORTB. The OTP memory prevents meter tampering code from being rewritten, an important regulatory requirement in many jurisdictions. With 128 bytes of RAM and 3.5 KB program space, it implements IEC 62053-21 Class 1 accuracy metrology with proper signal conditioning, replacing more expensive flash MCUs.
Recommended
Lighting Ballast Controller
Fluorescent and HID ballast designs use the PIC16C622T-20E/SO to generate lamp ignition sequences, monitor arc current, and protect against end-of-life failures. The two analog comparators detect zero-current crossings for PFC control and arc voltage for thermal fault shutdown, while PORTB drives the half-bridge gate driver via opto-isolation. OTP memory locks the dimming curve and ignition algorithm, while the -40 Β°C to +125 Β°C range covers enclosed luminaire thermal conditions.
Recommended
Industrial Sensor Interface Board
The PIC16C622T-20E/SO serves as a low-cost digital interface for industrial 4-20 mA loop sensors, proximity switches, and limit switches where on-board comparators implement window-detection thresholds and OTP memory prevents unauthorized firmware changes. RS-485 communication is bit-banged on PORTB, while the industrial -40 Β°C to +125 Β°C temperature rating handles factory floor ambient. Each board costs under USD 3 in volume, making it ideal for distributed sensor networks with many nodes.
Recommended
Consumer White Goods Remote Keypad
Microwave oven, range hood, and TV remote control keypads use the PIC16C622T-20E/SO to scan matrix keypads, drive LED indicators, and generate IR or RF carrier modulation through Timer0 PWM. With 13 I/O handling 4x4 key matrix plus status LEDs and a transmit driver, and 3.5 KB program space sufficient for encoding protocols, the device delivers full remote control functionality at OTP cost. Brown-out reset prevents low-battery corruption in portable battery-powered consumer products.
Recommended
Low-Cost Automotive Subsystem
The PIC16C622T-20E/SO is found in non-safety automotive subsystems such as HVAC blend door actuators, seat position memory, and interior lighting controllers where its 3.0-6.0 V supply directly interfaces with 12 V automotive rails through regulators. The -40 Β°C to +125 Β°C operating range handles under-dash thermal conditions, and OTP memory locks calibration tables against field tampering. For safety-critical systems, Microchip mandates migrating to AEC-Q100 qualified PIC16F variants instead.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C622T-20E/SO β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16F627-20I/SO | PIC16F628-20I/SO | PIC16C621-20E/SO | PIC16C620-20E/SO |
|---|---|---|---|---|---|
| Package | 18-SOIC | 18-SOIC - same | 18-SOIC - same | 18-SOIC - same | 18-SOIC - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core | 8-bit PIC RISC | 8-bit PIC RISC - same | 8-bit PIC RISC - same | 8-bit PIC RISC - same | 8-bit PIC RISC - same |
| Max Clock | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Program Memory | 3.5 KB OTP | 3.5 KB Flash | 3.5 KB Flash | 3.5 KB OTP | 3.5 KB OTP |
| RAM | 128 bytes | 128 bytes | 224 bytes | 128 bytes | 96 bytes |
| Comparators | 2 | 2 | 2 | 1 | 0 |
| I/O Pins | 13 | 13 | 13 | 13 | 13 |
| Supply Voltage | 3.0 V to 6.0 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 3.0 V to 6.0 V | 3.0 V to 6.0 V |
| Operating Temperature | -40 Β°C to +125 Β°C | -40 Β°C to +85 Β°C (I) | -40 Β°C to +85 Β°C (I) | -40 Β°C to +125 Β°C | -40 Β°C to +125 Β°C |
| Lifecycle | Obsolete | Active | Active | Obsolete | Obsolete |
Key Differentiators
- Two on-chip analog comparators with programmable voltage reference (vs PIC16C620-20E/SO)
- Flash-reprogrammable drop-in option exists for migration (vs PIC16F627-I/SO)
- Industry-standard 18-SOIC footprint with broad second-source (vs Custom-package MCU alternatives)
Design Notes
Place a 0.1 Β΅F ceramic decoupling capacitor directly across VDD (pin 14) and VSS (pin 5) as close to the package as possible, with traces no longer than 5 mm. Add a bulk 10 Β΅F tantalum or aluminum polymer capacitor on the same rail to suppress voltage droop during GPIO switching transients. Per Microchip datasheet 30235e DC characteristics, VDD rise time must be monotonic for proper power-on reset; if a slow-rising regulator is used, add an external MCP100 supervisor to assert MCLR until VDD stabilizes.
Do not exceed absolute maximum VDD of 6.5 V or ESD ratings on MCLR/VPP. The /MCLR pin must never be left floating; tie it to VDD through a 10 kΞ© resistor or directly to VDD for normal operation. ICSP programming requires the RB6/RB7 pins to be isolated from external pull-ups greater than 10 kΞ© during programming, otherwise the high-side driver will fight the programmer. Per Microchip programming specification, OTP memory must be programmed with a Microchip-approved gang programmer such as PICSTART Plus or MPLAB PM3 in production.
Keep the oscillator traces (OSC1 pin 16, OSC2 pin 15) short and surrounded by a ground guard ring to minimize EMI coupling into nearby analog comparator inputs. For crystal mode, place the load capacitors (typically 15-33 pF) within 3 mm of the OSC pins. Route analog comparator inputs (RA0-RA3) away from digital switching traces; the on-chip comparators have Β±5 mV offset and 200 ns response time, so clean ground returns and short traces improve threshold-detection accuracy. Per Microchip datasheet 30235e analog section, the CVREF pin should be bypassed with 0.01 Β΅F when used.
Estimated: At maximum 20 MHz clock with all 13 I/O pins driving 20 pF loads at 5 V, the AC dynamic current adds approximately 6 mA; combined with the DC quiescent of 2-5 mA, total VDD current is typically 7-11 mA, giving power dissipation of 35-55 mW at 5 V. The 18-SOIC package has ΞΈJA of approximately 80 Β°C/W, resulting in a 4 Β°C junction temperature rise above ambient - well within the -40 Β°C to +125 Β°C operating range. No heatsink is required.
Compliance Information
RoHS status non-compliant due to legacy OTP EPROM process; however the part uses lead-free matte-tin finish and accepts Pb-free reflow profiles. Not AEC-Q100 qualified - automotive safety applications must use qualified PIC16F equivalents. Obsolete lifecycle per Microchip product change notification.
