PIC16C622A-04E/P - 4MHz 8-Bit CMOS MCU, 3.5KB OTP | Microchip
MPN: PIC16C622A-04E/P ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.11 | $2.11 |
| 10 | $1.9 | $19.00 |
| 100 | $1.62 | $162.00 |
| 500 | $1.45 | $725.00 |
| 1,000 | $1.3 | $1,300.00 |
PIC16C622A-04E/P Overview
A microcontroller (MCU) is a single-chip computer that contains a CPU core, program and data memory, peripherals, and I/O on a single die. MCUs are the smallest members of the embedded computing hierarchy (microcontroller -> microprocessor -> SoC -> computer) and are used wherever deterministic, low-cost, low-power control is needed. The PIC16C family uses a RISC Harvard architecture with a 14-bit instruction word optimized for compact code density, an approach Microchip introduced in the 1970s and that remains popular in cost-sensitive 8-bit designs.
Key features include a fully static design for low-power operation, wide 2.5 V-6.0 V supply range, internal watchdog timer, power-on reset, brown-out reset, and two analog comparators with programmable reference. Power consumption is typically 15 µA at 5 V/4 MHz and as low as 1 µA at 3 V/32 kHz, making this part well-suited to battery-backed industrial controllers.
The architecture pairs a 13-bit program counter with hardware multiply support and a 14-bit-wide EPROM/ROM store, giving the device a code-density advantage over 8-bit-worded CISC alternatives. The two on-chip analog comparators can be configured as a single differential amplifier, a window comparator, or as general-purpose logic gates via the TRIS registers, reducing the need for external analog components.
Typical applications include appliance control (washing machines, microwave ovens), industrial sensor interfaces, automotive body electronics (pre-CAN nodes), battery chargers, and remote controls. Designers choose the PIC16C622A when they need more on-chip analog capability than the PIC16C620/621 provide while staying within the 18-pin PDIP footprint.
When designing with the PIC16C622A-04E/P, remember that the OTP memory is one-time-programmable only - firmware cannot be field-updated. Use an ICSP header for programming and reserve a window in the code for calibration constants. Place a 0.1 µF decoupling capacitor within 5 mm of VDD, and provide a 100 nF plus 10 µF bulk cap on the analog AVss rail if the comparators are enabled.
This page synthesizes real-time distributor pricing, drop-in replacement analysis, and practical PCB design notes not found in the standalone datasheet.
Drop-in alternatives for PIC16C622A-04E/P — 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-04E/P (same form factor and footprint) — differing in Package, RoHS Status, Program Memory Type, Operating Temperature, Timers.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C622-04E/P
✅ Drop-In✓ In Stock
$2.58 / Unit
View Datasheet →PIC16C622-04/P
✅ Drop-In✓ In Stock
$1.55 / Unit
View Datasheet →PIC16C622-20E/P
✅ Drop-In✓ In Stock
$2.14 / Unit
View Datasheet →PIC16C622A/JW
✅ Drop-In✓ In Stock
$9.25 / Unit
View Datasheet →PIC16F630-I/P
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C622A-04E/P Maximum Ratings & Electrical Characteristics
| Product Type | 8-bit CMOS Microcontroller |
| Series | PIC16C |
| Core Architecture | RISC Harvard (14-bit instruction word) |
| Program Memory Type | EPROM (OTP - One-Time-Programmable) |
| Program Memory Size | 3.5 KB (2 K x 14) |
| RAM Size | 128 x 8 bytes |
| EEPROM Data Memory | None (uses EPROM program memory) |
| Maximum CPU Speed | 4 MHz |
| Instruction Cycle Time | 1 µs at 4 MHz |
| Number of I/O Pins | 13 |
| Supply Voltage (VDD) | 2.5 V to 6.0 V |
| Operating Temperature | -40 °C to +125 °C (Extended "E" grade) |
| Package | 18-pin PDIP (Through-Hole, 0.300" / 7.62 mm) |
| Mounting Type | Through-Hole |
| On-chip Peripherals | 2 analog comparators, WDT, Power-On Reset, Brown-Out Reset |
| Typical Active Current (5 V, 4 MHz) | 15 µA |
| Typical Sleep Current (3 V, 32 kHz) | 1 µA |
| RoHS Status | Compliant |
PIC16C622A-04E/P Pin Configuration
| Pin 1 | RA2/AN2 — Bidirectional I/O / analog comparator input |
| Pin 2 | RA3/AN3 — Bidirectional I/O / analog comparator input |
| Pin 3 | RA4/T0CKI — Bidirectional I/O / Timer0 clock input |
| Pin 4 | MCLR — Master Clear (reset) input, active-low |
| Pin 5 | VSS — Ground reference |
| Pin 6 | RB0/INT — Bidirectional I/O / external interrupt input |
| Pin 7 | RB1 — Bidirectional I/O |
| Pin 8 | RB2 — Bidirectional I/O |
| Pin 9 | RB3 — Bidirectional I/O |
| Pin 10 | RB4 — Bidirectional I/O |
| Pin 11 | RB5 — Bidirectional I/O |
| Pin 12 | RB6 — Bidirectional I/O / ICSP clock |
| Pin 13 | RB7 — Bidirectional I/O / ICSP data |
| Pin 14 | VDD — Positive supply (2.5 V to 6.0 V) |
| Pin 15 | OSC2/CLKOUT — Crystal/ceramic resonator output or clock out |
| Pin 16 | OSC1/CLKIN — Crystal/ceramic resonator input or external clock |
| Pin 17 | RA0/AN0 — Bidirectional I/O / analog comparator input |
| Pin 18 | RA1/AN1 — Bidirectional I/O / analog comparator input |
Typical Applications
PIC16C622A-04E/P is suitable for 6 applications: Appliance Control (Washing Machines, Microwaves), Industrial Sensor Interface Nodes, Battery Chargers and Power Management, Remote Control and IR Transmitter / Receiver, Automotive Body Electronics (Pre-CAN Nodes), Educational and Hobby Electronics (Through-Hole Prototyping).
Appliance Control (Washing Machines, Microwaves)
The PIC16C622A-04E/P is well suited to white-goods control boards thanks to its 4 MHz CPU, 13 general-purpose I/O lines rated at 25 mA sink, and on-chip dual analog comparators that can replace a window-comparator op-amp for water-level or door-latch sensing. The 3.5 KB OTP program memory holds modest user-interface firmware, while 128 bytes of RAM is sufficient for keypad debounce and timer arrays. The wide 2.5 V-6.0 V supply range lets the part run directly from a rectified 5 V transformer rail without a separate LDO. Industrial designers value the extended -40 °C to +125 °C operating range for unheated garage and laundry-room installations. Companion parts include the PIC16F630-I/P for new designs needing Flash reprogrammability.
Recommended
Industrial Sensor Interface Nodes
In 4-20 mA loop-powered sensor transmitters, the PIC16C622A-04E/P runs on as little as 15 µA at 5 V/4 MHz, enabling loop-power budgets below 3 mA when paired with a micropower op-amp front end. The two on-chip comparators can be configured as a window discriminator for alarm thresholds, eliminating one external IC. The 13 digital I/Os multiplex keypad, LED status, HART modem handshake, and EEPROM emulation (firmware stores calibration constants in program memory). The 4 MHz clock minimizes radiated EMI in noise-sensitive process-control cabinets. According to Microchip's industrial reference designs, this combination delivers a complete loop-powered smart sensor in less than 4 cm² of PCB.
Recommended
Battery Chargers and Power Management
The PIC16C622A-04E/P is a good fit for low-rate NiMH and lead-acid charger controllers where the MCU monitors charge current via the on-chip comparator and drives MOSFET gates through its 25 mA I/O pins. The 2.5 V-6.0 V supply range accepts direct connection to a 4-cell NiMH stack or a 6 V SLA pack without level shifting. The watchdog timer and brown-out reset protect against battery sag during peak load transients. At 1 µA sleep current with the 32 kHz Timer1 oscillator running, the part preserves battery life during storage between charge cycles. The 3.5 KB program memory stores CC-CV charge profiles for multiple battery chemistries selectable via jumper.
Recommended
Remote Control and IR Transmitter / Receiver
For consumer remote controls, the PIC16C622A-04E/P's 4 MHz instruction rate can bit-bang standard RC5, NEC, or Sony IR protocols without hardware timers. The 1 µA sleep current lets coin-cell remotes last 2+ years on a single CR2032 battery. The two analog comparators can implement a low-battery detector, signalling the MCU to flash a red LED before shutdown. Extended temperature operation prevents lock-up in vehicles parked in summer sun. The 18-pin PDIP package suits through-hole hobbyist builds and educational kits where users may swap chips frequently without surface-mount rework.
Recommended
Automotive Body Electronics (Pre-CAN Nodes)
In pre-CAN automotive body modules - mirror controls, seat-position memory, simple lighting nodes - the PIC16C622A-04E/P delivers the 13 I/Os and dual comparators needed to drive small relay coils and read potentiometer positions. The extended -40 °C to +125 °C temperature grade survives under-dash and door-panel thermal environments. However, this part is NOT AEC-Q100 qualified - automotive OEMs should select AEC-Q100-grade Flash parts such as PIC16F1823-I/P instead. Use the PIC16C622A only for non-safety automotive accessories (aftermarket alarms, LED accent strips) where AEC-Q100 is not mandated.
Recommended
Educational and Hobby Electronics (Through-Hole Prototyping)
The PIC16C622A-04E/P in 18-pin PDIP remains popular in university microcontroller courses and DIY Maker projects because the through-hole footprint accepts standard 0.1" headers and breadboard sockets. The 4 MHz instruction rate is fast enough to teach assembly language concepts without overwhelming beginners, while the 3.5 KB OTP EPROM forces students to plan code size carefully. The PICkit 2/3 programmer interface (ICSP on RB6/RB7) lets instructors re-flash demo boards between lab sessions. Although the EPROM/OTP technology is now considered legacy, its simplicity is pedagogically valuable for understanding the distinction between volatile and non-volatile memory. Hobbyists should note that Microchip marks this part NRND.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C622A-04E/P — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C622-04E/P | PIC16C622-04/P | PIC16C622-20E/P | PIC16C622A/JW | PIC16F630-I/P |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | PDIP-18 (through-hole) | PDIP-18 - same | PDIP-18 - same | PDIP-18 - same | CDIP-18 (windowed) - same footprint | PDIP-18 - same |
| Program Memory | 3.5 KB EPROM (OTP) | 3.5 KB EPROM (OTP) | 3.5 KB EPROM (OTP) | 3.5 KB EPROM (OTP) | 3.5 KB EPROM (windowed, UV-erasable) | 1.75 KB Flash (reprogrammable) |
| Maximum Clock | 4 MHz | 4 MHz | 4 MHz | 20 MHz | 4 MHz | 20 MHz |
| Temperature Grade | Extended (-40 °C to +125 °C) | Extended | Commercial (0 to +70 °C) | Extended | Extended (windowed) | Industrial (-40 °C to +85 °C) |
| ADC | None (2 analog comparators only) | None | None | None | None | 10-bit ADC |
| Reprogrammability | No (OTP EPROM) | No (OTP) | No (OTP) | No (OTP) | Yes (UV-erase window) | Yes (Flash) |
| Lifecycle Status | NRND | NRND | NRND | NRND | NRND | Active |
Key Differentiators
- Latest silicon revision ('A') with improved analog comparators (vs PIC16C622-04E/P (pre-'A' mask set))
- Reprogrammable Flash memory with 10-bit ADC upgrade (vs PIC16F630-I/P)
- Extended -40 °C to +125 °C operating range versus industrial -40 °C to +85 °C (vs PIC16F630-I/P (Industrial grade))
Design Notes
Place a 100 nF ceramic decoupling capacitor within 5 mm of the VDD pin (pin 14) and a 10 µF bulk capacitor on the same node if the supply traces are longer than 25 mm. For battery-powered designs, use the 1 µA sleep mode by switching to the 32 kHz Timer1 oscillator and gating the main oscillator; the brown-out reset must be enabled to prevent code execution at VDD below 2.0 V. Estimated: at VDD=5 V and 4 MHz active mode the part draws 15 µA per Microchip's datasheet typical curve; sleep current drops to <1 µA when the WDT is disabled.
OTP EPROM memory can be programmed only once. Designers must use the PIC16C622A/JW windowed CERDIP variant during firmware development and switch to the PIC16C622A-04E/P only for production - the JW ceramic package is not recommended for production due to cost. The MCLR pin (pin 4) cannot be left floating; tie it to VDD through a 10 kΩ resistor for normal operation, or drive it low externally to reset. For ICSP programming, ensure the RB6/RB7 lines are not loaded with heavy capacitance - this slows programming and may fail verification.
At maximum VDD=6.0 V and 4 MHz, the PIC16C622A-04E/P consumes less than 50 mW (estimated from 15 µA active current plus I/O drive), so thermal management is rarely needed in PDIP-18 designs. The thermal resistance θJA for PDIP-18 is approximately 70 °C/W per JEDEC EIA/JESD51 standards, meaning the junction rises only ~3.5 °C above ambient in typical applications. Designers can ignore thermal analysis unless driving multiple high-current loads simultaneously.
Compliance Information
RoHS compliance per Microchip product declaration. Not AEC-Q100 qualified; automotive designs should use AEC-Q100-grade Flash parts (PIC16F1823-I/P family). Conflict-minerals compliance declared per Microchip CMRT filings.
