PIC16C622T-04E/SO - 4MHz 8-Bit OTP MCU 3.5KB | Microchip
MPN: PIC16C622T-04E/SO β End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.42 | $5.42 |
| 10 | $4.85 | $48.50 |
| 100 | $4.1 | $410.00 |
| 500 | $3.55 | $1,775.00 |
| 1,000 | $3.1 | $3,100.00 |
PIC16C622T-04E/SO Overview
A PIC (Peripheral Interface Controller) microcontroller is a Harvard-architecture RISC device optimized for embedded control. PIC16C-series parts sit in the legacy mid-range family (PIC10/12/16/18 hierarchy -> 8-bit microcontroller -> MCU -> embedded processor), using a 14-bit instruction word. The PIC16C622 specifically targets applications needing on-chip analog comparators without a full ADC, which keeps cost, code size, and power low.
Key features include 3.5KB OTP program memory, 128 bytes of data RAM, a hardware USART, a 13-bit timer/counter (TMR0), a watchdog timer with on-chip RC oscillator, power-on reset, brown-out reset, in-circuit serial programming, and two on-chip analog comparators with programmable reference. The 18-pin SOIC package supports surface-mount assembly with a 7.50 mm body width.
The PIC16C622 uses a 14-bit instruction RISC core with a 35-instruction set, each executing in a single instruction cycle (4 oscillator clocks). The OTP EPROM cell provides one-time programmable non-volatile storage for firmware that is intended to be stable in production, with programming voltages handled by the on-chip charge pump.
Typical applications include automotive subsystems, sensor signal conditioning, low-end appliance controls, simple closed-loop motor drivers, and battery-powered measurement instruments. The integrated analog comparators make it well-suited for threshold detection, zero-crossing detection, and analog feedback loops.
When designing with this part, note that the OTP memory cannot be re-programmed in-circuit, so ensure code is fully validated before committing. Use the brown-out reset to protect against unstable supply conditions, and place decoupling capacitors within 5 mm of the VDD pin.
This page synthesizes distributor pricing, verified drop-in alternatives, and practical design notes not found in the standalone manufacturer datasheet.
Drop-in alternatives for PIC16C622T-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 PIC16C622T-04E/SO (same form factor and footprint) β differing in Program Memory Size, RoHS Status, Timers, Program Memory Type, Operating Temperature Range.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
PIC16C622T-04I/SO
β Drop-Inβ In Stock
$2.06 / Unit
View Datasheet βPIC16C622-04I/SO
β Drop-Inπ Reference alternative (not in catalog)
PIC16C621T-20E/SO
β Drop-Inβ In Stock
$1.72 / Unit
View Datasheet βPIC16C620T-20E/SO
β Drop-Inπ Reference alternative (not in catalog)
PIC16C621AT-20E/SO
β Drop-In β οΈ εζ°εΎ ιͺθ―β In Stock
$2.18 / Unit
View Datasheet βPIC16F627A-I/SO
β Drop-Inπ Reference alternative (not in catalog)
PIC16C622T-04E/SO Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC 8-bit RISC (14-bit instruction word) |
| Series | PIC16C |
| Program Memory Size | 3.5 KB (2K x 14) OTP EPROM |
| RAM Size | 128 x 8 bytes |
| EEPROM Size | None (not present) |
| Maximum CPU Frequency | 4 MHz |
| Supply Voltage (VDD) | 3.0 V to 5.5 V |
| Number of I/O Pins | 13 |
| Number of Timers | 1 (TMR0, 8-bit) |
| Analog Comparators | 2 on-chip comparators |
| Communication Interfaces | USART/SCI |
| Watchdog Timer | Yes (with on-chip RC oscillator) |
| Brown-out Reset | Yes |
| Power-on Reset | Yes |
| In-Circuit Serial Programming | Yes (ICSP) |
| Package / Case | 18-SOIC (0.295 inch / 7.50 mm body width) |
| Mounting Type | Surface Mount |
| Temperature Grade | Extended (Automotive, -40C to +125C) |
| RoHS Status | Non-Compliant (legacy OTP windowed/erasable part) |
PIC16C622T-04E/SO Pin Configuration
| Pin 1 | RA2/AN2 β PORTA bit 2 / analog comparator 2 non-inverting input |
| Pin 2 | RA3/AN3 β PORTA bit 3 / analog comparator 2 inverting input |
| Pin 3 | RA4/T0CKI β PORTA bit 4 / Timer0 external clock input |
| Pin 4 | MCLR β Master Clear reset input (active low) |
| Pin 5 | VSS β Ground reference |
| Pin 6 | RB0/INT β PORTB bit 0 / external interrupt input |
| Pin 7 | RB1 β PORTB bit 1 (digital I/O) |
| Pin 8 | RB2 β PORTB bit 2 (digital I/O) |
| Pin 9 | RB3 β PORTB bit 3 (digital I/O) |
| Pin 10 | RB4 β PORTB bit 4 (digital I/O) |
| Pin 11 | RB5 β PORTB bit 5 (digital I/O) |
| Pin 12 | RB6 β PORTB bit 6 (digital I/O) |
| Pin 13 | RB7 β PORTB bit 7 (digital I/O) |
| Pin 14 | VSS β Ground reference (also bonded to bottom pad in some layouts) |
| Pin 15 | RC0 β PORTC bit 0 (digital I/O) |
| Pin 16 | RC1 β PORTC bit 1 (digital I/O) |
| Pin 17 | RC6/TX/CK β PORTC bit 6 / USART asynchronous transmit / synchronous clock |
| Pin 18 | RC7/RX/DT β PORTC bit 7 / USART asynchronous receive / synchronous data |
| Pin 19 | VDD β Positive supply voltage (3.0V to 5.5V) |
| Pin 20 | NC β Not connected (no internal bond on 18-SOIC PIC16C622) |
Typical Applications
PIC16C622T-04E/SO is suitable for 6 applications: Automotive Sensor Threshold Detection, Appliance Control Boards, Battery-Powered Measurement Instruments, Low-End Motor Speed Controllers, Security and Access Control Panels, Industrial Threshold and Zero-Crossing Detection.
Automotive Sensor Threshold Detection
The PIC16C622T-04E/SO is well-suited for automotive sensor threshold detection because it integrates two on-chip analog comparators, eliminating the need for external comparator ICs in signal-conditioning paths. Its 3.5KB OTP program memory provides adequate code space for digital filtering and decision logic, while the -40C to +125C extended temperature grade handles underhood and chassis environments. The 13 I/O pins can read multiple sensor channels and drive MOSFETs or relays. Brown-out reset and the watchdog timer with on-chip RC oscillator protect against the voltage transients and lockups common in automotive electrical systems.
Recommended
Appliance Control Boards
The PIC16C622T-04E/SO fits well in low-end appliance control boards such as washing-machine timers, microwave keypads, and induction-cooktop interfaces. The 13 I/O pins drive 7-segment displays, keypad matrices, triac optocouplers, and buzzer feedback directly. The on-chip hardware USART enables communication with inverter boards and external sensor modules, while the two analog comparators monitor motor current and supply rail voltage for fault detection. The 4MHz clock is sufficient for relay debouncing and slow PWM motor-speed control without taxing the 3.5KB code space.
Recommended
Battery-Powered Measurement Instruments
In battery-powered measurement instruments such as handheld multimeters, clamp meters, and portable gas detectors, the PIC16C622T-04E/SO offers a balanced trade-off between functionality and power. The 3.0V to 5.5V supply range supports both 3.3V coin-cell and 5V battery configurations, while the two on-chip analog comparators can directly threshold-detect sensor outputs without waking an external ADC. The PIC16C-series core has decades-proven low-power idle behavior, and the on-chip watchdog keeps system lockup recovery simple. The 3.5KB OTP memory is well-matched to fixed-function instruments that do not require firmware updates in the field.
Recommended
Low-End Motor Speed Controllers
The PIC16C622T-04E/SO can implement low-end brushed DC and small universal-motor speed controllers, especially in fans, pumps, and small appliances. The 8-bit timer generates PWM at suitable frequencies for the chosen switching transistor, while the two analog comparators provide cycle-by-cycle current limiting and zero-crossing detection for back-EMF sensing. Brown-out reset prevents MOSFET shoot-through at low battery, and the watchdog timer recovers from ESD-induced firmware lockups. With 3.5KB OTP code space, a full PID-style closed-loop controller fits comfortably.
Recommended
Security and Access Control Panels
The PIC16C622T-04E/SO is appropriate for keypad-based access-control panels and simple security alarm keypads, where the 13 I/O pins interface with a 4x4 matrix keypad, an LCD or LED indicator array, a magnetic-door sensor, and a relay-driven lock output. The hardware USART connects to a central alarm panel for event logging. The two on-chip comparators monitor the supply rail and detect tamper-switch activation even when the MCU is in idle mode. OTP memory is acceptable for security panels whose firmware is field-locked at production.
Recommended
Industrial Threshold and Zero-Crossing Detection
The PIC16C622T-04E/SO is well-suited for industrial threshold detection and zero-crossing detection modules in power-control and instrumentation systems. The two on-chip analog comparators detect AC line zero-crossings for triac synchronization and monitor overcurrent/overvoltage thresholds without external components. The extended -40C to +125C temperature grade handles factory-floor environments, and the brown-out reset plus watchdog timer ensure long-term reliability in unattended installations. The 4MHz core and 3.5KB OTP memory are sufficient for fixed-function relay logic and SCADA I/O modules.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C622T-04E/SO β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C622T-04I/SO | PIC16C622-04I/SO | PIC16C621T-20E/SO | PIC16F627A-I/SO |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 18-SOIC | 18-SOIC - same | 18-SOIC - same | 18-SOIC - same | 18-SOIC - same |
| Program Memory | 3.5 KB OTP | 3.5 KB OTP | 3.5 KB OTP | 3.5 KB OTP | 1.75 KB Flash (reprogrammable) |
| RAM | 128 B | 128 B | 128 B | 128 B | 128 B |
| Max CPU Frequency | 4 MHz | 4 MHz | 4 MHz | 20 MHz | 20 MHz |
| Analog Comparators | 2 | 2 | 2 | 1 | 2 |
| Temperature Grade | Extended -40C to +125C | Industrial -40C to +85C | Industrial -40C to +85C | Extended -40C to +125C | Industrial -40C to +85C |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Active |
Key Differentiators
- Extended automotive temperature grade on a 4MHz 18-SOIC PIC16C OTP MCU (vs PIC16C622T-04I/SO)
- Two on-chip analog comparators versus one in PIC16C621 family (vs PIC16C621T-20E/SO)
- Field-upgradable migration path to Flash-based sibling (vs PIC16F627A-I/SO)
Design Notes
Place a 100nF decoupling capacitor within 5 mm of the VDD pin and a 10uF bulk capacitor near the board power entry. The PIC16C622T-04E/SO brown-out reset voltage threshold is approximately 4.0V on a 5V supply; if your design operates near this margin during cold-crank or load-dump transients, add an external voltage supervisor such as MCP100 to prevent code execution from corrupted OTP. Estimated: with VDD=5V and I_DD=2mA active, decoupling RC time constant is 0.1ms - sufficient to suppress 100kHz switching noise.
The PIC16C622 uses OTP (one-time programmable) EPROM, so firmware cannot be updated in-circuit. Code must be fully validated on a windowed or Flash-equivalent prototype (PIC16F627 in same 18-SOIC package) before committing to OTP production units. Additionally, the MCLR pin is active-low; if left floating, the MCU can spontaneously reset from EMI. Tie MCLR to VDD through a 10k resistor with a 100nF cap to VDD for typical applications, or drive it directly from a supervisor output.
The 18-SOIC package has a 1.27 mm pitch. Route RA and RB port signals away from the analog comparator inputs if you need clean comparator thresholds; keep digital traces at least 3 mm away from RA0/RA1/RA2/RA3 to avoid injected noise. Place the ICSP clock and data signals (RB6 and RB7) on short, guarded traces and add 4.7k pull-ups to VDD to allow reliable in-circuit programming without disrupting the application circuit.
Compliance Information
The PIC16C622T-04E/SO is a legacy OTP EPROM part predating full RoHS transition; it is generally non-RoHS compliant per Microchip part number conventions. Lead-free and halogen-free status are unknown for this specific variant; verify with the distributor certificate of conformance (CoC) before use in RoHS-restricted markets. AEC-Q100 automotive qualification status is unknown for this legacy part; the 'E' temperature grade alone does not guarantee AEC-Q100 certification.
