PIC16C622AT-04E/SS - 8-Bit EPROM MCU 3.5KB 13 I/O SSOP-20 | Microchip
MPN: PIC16C622AT-04E/SS ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.95 | $3.95 |
| 10 | $3.55 | $35.50 |
| 100 | $3.18 | $318.00 |
| 500 | $2.86 | $1,430.00 |
| 1,000 | $2.55 | $2,550.00 |
PIC16C622AT-04E/SS Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory, and peripherals. The 8-bit PIC16C62X family uses a Harvard RISC architecture with 35 instructions, optimized for deterministic real-time control. PIC16C622A variants fall within the wider PIC16C5X/PIC16C6X taxonomy of OTP/EPROM 8-bit microcontrollers, which belong to the broader semiconductor category of microcontrollers and embedded processors.
Key features include two on-chip analog comparators with programmable reference voltage (0.6 V to (Vdd - 1.5 V)), 13 bidirectional I/O pins with individual direction control, 8-bit and 16-bit timer/counters, power-saving SLEEP mode, programmable code protection, and in-circuit serial programming (ICSP) capability. The device also offers a 25 mA source/sink capability per I/O, supporting direct LED drive in many applications.
The PIC16C622AT-04E/SS is built on Microchip's low-power CMOS process and incorporates a 14-bit instruction word with 8-bit data path. With 35 single-cycle instructions (200 ns at 20 MHz, 1 µs at 4 MHz), it provides predictable execution timing suitable for interrupt-driven control. Internal oscillator options and watchdog timer improve system reliability in noisy industrial environments.
Typical applications include appliance controls, security and alarm systems, automotive subsystems (post-ignition), small office equipment, sensor conditioning front-ends, and consumer electronics where compact SSOP-20 footprint, low cost, and integrated comparators simplify board design. The two analog comparators make it particularly attractive for battery monitoring, threshold detection, and zero-cross detection circuits.
When designing with this MCU, ensure decoupling: place a 0.1 µF ceramic capacitor close to VDD/VSS pins. Programming the CONFIG register is mandatory before code execution. Use the ICSP interface (RB6/RB7) for in-field firmware updates, especially when migrating from the PIC16C622 to PIC16C622A silicon revision.
This page synthesizes distributor pricing, drop-in alternatives (same SSOP-20 footprint), and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for PIC16C622AT-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 PIC16C622AT-04E/SS (same form factor and footprint) — differing in Program Memory Size, Watchdog Timer, Operating Temperature Range, Program Memory Type, Data EEPROM.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C622A-04E/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C622-04/SS
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$1.18 / Unit
View Datasheet →PIC16C622-20E/SS
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$2.49 / Unit
View Datasheet →PIC16C622-20I/SS
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$1.44 / Unit
View Datasheet →PIC16C622-20/SS
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$1.38 / Unit
View Datasheet →PIC16F628A-I/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C622AT-04E/SS Maximum Ratings & Electrical Characteristics
| Program Memory Size | 3.5 KB (2K x 14) |
| Program Memory Type | OTP EPROM |
| RAM Size | 128 x 8 bytes |
| EEPROM Size | None |
| Number of I/O Pins | 13 |
| CPU Core | 8-bit PIC RISC |
| Instruction Set | 35 instructions, 14-bit width |
| Maximum Clock Frequency | 4 MHz |
| Operating Voltage Range | 3.0 V to 6.0 V |
| Operating Temperature Range | -40 C to +125 C (industrial) |
| Analog Comparators | 2 on-chip |
| Timer/Counters | 1 x 8-bit, 1 x 16-bit |
| Package / Case | 20-SSOP (0.295 inch, 7.50 mm width) |
| Mounting Type | Surface Mount |
| Data Retention | >40 years (EPROM cell) |
| In-Circuit Programming | Yes (ICSP, RB6/RB7) |
| Watchdog Timer | Yes |
| Power-on Reset | Yes |
PIC16C622AT-04E/SS Pin Configuration
| Pin 1 | RA2/AN2 — PORTA bit 2, analog comparator 2 input |
| Pin 2 | RA3/AN3 — PORTA bit 3, analog comparator 3 input |
| Pin 3 | RA4/T0CKI — PORTA bit 4, Timer0 clock input |
| Pin 4 | RA5/MCLR/VPP — PORTA bit 5 / Master Clear / programming voltage |
| Pin 5 | VSS — Ground reference |
| Pin 6 | RB0/INT — PORTB bit 0, external interrupt |
| Pin 7 | RB1 — PORTB bit 1 |
| Pin 8 | RB2 — PORTB bit 2 |
| Pin 9 | RB3 — PORTB bit 3 |
| Pin 10 | RB4 — PORTB bit 4 |
| Pin 11 | RB5 — PORTB bit 5 |
| Pin 12 | RB6/PGC — PORTB bit 6, ICSP clock |
| Pin 13 | RB7/PGD — PORTB bit 7, ICSP data |
| Pin 14 | VSS — Ground reference |
| Pin 15 | OSC2/CLKOUT — Oscillator output / clock out |
| Pin 16 | OSC1/CLKIN — Oscillator input / external clock |
| Pin 17 | RA0/AN0 — PORTA bit 0, analog comparator 0 input |
| Pin 18 | RA1/AN1 — PORTA bit 1, analog comparator 1 input |
| Pin 19 | VSS — Ground reference |
| Pin 20 | VDD — Positive supply voltage |
Typical Applications
PIC16C622AT-04E/SS is suitable for 7 applications: Appliance Control Boards, Security and Alarm Panels, Sensor Conditioning Front-Ends, Small Office Equipment, Battery-Powered Threshold Monitors, Consumer Electronics Keypads, Automotive Aftermarket Accessories.
Appliance Control Boards
The PIC16C622AT-04E/SS fits appliance control boards (washing machines, dishwashers, microwave ovens) thanks to its 3.5 KB EPROM program memory, two on-chip analog comparators for zero-cross and water-level detection, 13 I/O rated at 25 mA source/sink, and 4 MHz operating speed sufficient for relay and triac timing loops. Place the MCU near sensor inputs to minimize analog noise pickup; comparator thresholds are programmable via the CVREF DAC. Industrial -40 C to +125 C operating range handles the under-cabinet thermal environment.
Recommended
Security and Alarm Panels
The PIC16C622AT-04E/SS is well suited for security panels where two analog comparators simplify PIR sensor signal conditioning and threshold detection. The 13 I/O drive LED status indicators, keypads, sirens, and piezo buzzers directly at 25 mA per pin. With 3.0 V to 6.0 V operation, the device runs from battery-backed 5 V rails with brown-out reset supervision. Industrial temperature operation supports outdoor enclosures in temperate climates.
Recommended
Sensor Conditioning Front-Ends
Sensor signal conditioning benefits from the PIC16C622AT-04E/SS two integrated analog comparators, which let designers implement window detectors, level alarms, and Schmitt-trigger interfaces without external op-amps. The 4 MHz clock drives a 1 microsecond instruction cycle suitable for software state machines, while 128 bytes RAM handle small lookup tables for linearization. Add a precision VREF (e.g., MCP1525) for industrial transducer interfaces such as RTD and thermistor bridges.
Recommended
Small Office Equipment
Printers, scanners, copiers, and label makers use the PIC16C622AT-04E/SS for keypad scan, motor step sequencing, and sensor reading. The 16-bit timer/counter handles encoder pulse counting for paper-feed and print-head position control. The 25 mA per-pin drive eliminates driver transistors for low-current solenoids and LEDs. Industrial temperature rating supports the heat inside equipment enclosures, and the SSOP-20 footprint shrinks PCB area versus DIP-20.
Recommended
Battery-Powered Threshold Monitors
Battery monitoring circuits use the PIC16C622AT-04E/SS analog comparators to detect low-battery, over-temperature, and current-limit thresholds. The 3.0 V minimum VDD lets the MCU run from a depleted 3-cell NiMH pack during brownout, while SLEEP mode reduces quiescent to microamp levels for long shelf life. The 8-bit timer wakes the MCU periodically to scan voltage rails. Industrial temperature operation covers handheld and field equipment.
Recommended
Consumer Electronics Keypads
Toy controllers, remote keypads, and small appliances benefit from the PIC16C622AT-04E/SS SSOP-20 footprint, low pin count, and integrated analog comparators for button-press detection. The 4 MHz clock and 14-bit instruction width handle matrix keypad scanning at debounce intervals faster than human perception. With 128 bytes RAM, the device maintains a small state machine for user input. EPROM-based OTP ensures one-time firmware lock for anti-clone protection in consumer markets.
Recommended
Automotive Aftermarket Accessories
Non-safety automotive accessories such as alarm systems, lighting controllers, and HVAC trim use the PIC16C622AT-04E/SS because its industrial -40 to +125 C temperature range tolerates cabin and engine-bay thermal swings. The two comparators detect 12 V battery and ignition-line transitions for crank-cycle detection. The 5 V regulated operation draws low current and supports direct LED driver at 25 mA per pin. Note that AEC-Q100 is not qualified for this OTP device, so use only in non-safety accessory applications.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C622AT-04E/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C622A-04E/SS | PIC16C622-04/SS | PIC16C622-20E/SS | PIC16C622-20I/SS | PIC16C622-20/SS | PIC16F628A-I/SS | PIC16C621T-04I/SO |
|---|---|---|---|---|---|---|---|---|
| Package | 20-SSOP | 20-SSOP - same | 20-SSOP - same | 20-SSOP - same | 20-SSOP - same | 20-SSOP - same | 20-SSOP - same | 20-SOIC - different |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory | 3.5 KB OTP EPROM | 3.5 KB OTP EPROM | 3.5 KB OTP EPROM | 3.5 KB OTP EPROM | 3.5 KB OTP EPROM | 3.5 KB OTP EPROM | 3.5 KB Flash | 3.5 KB OTP EPROM |
| RAM Size | 128 B | 128 B | 128 B | 128 B | 128 B | 128 B | 224 B | 128 B |
| Maximum Clock | 4 MHz | 4 MHz | 4 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 4 MHz |
| I/O Pins | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 |
| Analog Comparators | 2 | 2 | 2 | 2 | 2 | 2 | 2 + voltage reference | 1 |
| Operating Voltage | 3.0 V to 6.0 V | 3.0 V to 6.0 V | 3.0 V to 6.0 V | 3.0 V to 6.0 V | 3.0 V to 6.0 V | 3.0 V to 6.0 V | 2.0 V to 5.5 V | 3.0 V to 6.0 V |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | Active | Obsolete |
Key Differentiators
- Silicon revision 'A' with documented errata (vs PIC16C622A-04E/SS)
- Flash reprogrammability (vs PIC16F628A-I/SS)
- Higher clock headroom (vs PIC16C622-20E/SS)
- Single comparator for cost reduction (vs PIC16C621T-04I/SO)
Design Notes
Decouple VDD (pin 20) with a 0.1 microfarad ceramic capacitor placed within 5 mm of the MCU, plus a 10 uF bulk electrolytic on the rail. Brown-out voltage is configured via the CONFIG register at 2.0 V or 4.0 V; choose 4.0 V for 5 V systems. Avoid long VDD traces that act as antennae for switching noise from relays or solenoids; route noisy return currents directly to the bulk cap, not through the MCU VSS pin.
Do not leave RA5/MCLR floating when used as a digital I/O; either tie it to VDD through a 10 kohm pull-up or configure it as a digital input only after programming is complete. The PIC16C622A silicon revision requires ICSP with VDD between 4.5 V and 5.5 V; below 4.5 V, programming may fail. Watchdog timer must be either cleared in software or disabled in CONFIG to avoid unwanted resets during long EEPROM or ADC wait loops.
Keep analog comparator inputs (RA0-RA3) away from high-frequency digital traces and clock oscillator pins; a 5 mm keep-out improves noise immunity on threshold detection. Place the external crystal or resonator (if not using the internal oscillator) within 5 mm of OSC1/OSC2 (pins 15/16) with short ground return. For SSOP-20, route all 13 I/O on the package periphery with the VDD/VSS pair adjacent to bypass cap for best signal integrity.
Estimated: at 5 V VDD, 4 MHz clock, and 25 mA per I/O load on a single pin, dissipation is approximately 125 mW for the I/O load plus 5 mW core. Total power stays below 150 mW in typical applications; the SSOP-20 thermal resistance is around 95 C/W, producing a 14 C rise above ambient. No heatsink is required. For extreme-temperature designs, derate I/O sink current to 20 mA above +100 C ambient.
When driving LEDs or relays directly from I/O, add a series resistor to limit inrush and a flyback diode across inductive loads (1N4148 for small signals, 1N4007 for mains-referenced relays). Do not switch inductive loads faster than the port can sink; the PIC16C62X family datasheet recommends no faster than 10 kHz for direct-driven solenoids. For motor control, buffer with a dedicated driver such as ULN2003A or DRV8833 to keep digital logic noise off the MCU ground.
Compliance Information
RoHS, REACH, lead-free, and halogen-free status not stated explicitly in verified distributor data; PIC16C62X OTP family predates broad RoHS adoption. Not AEC-Q100 qualified - use only in non-safety consumer, industrial, or appliance applications. Check the Microchip PIC16C622 product page for the latest environmental compliance certificate.
