PIC16C622A-04/SS - 8-bit OTP MCU, 4MHz, 3.5KB EPROM | Microchip
MPN: PIC16C622A-04/SS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.95 | $3.95 |
| 10 | $3.55 | $35.50 |
| 100 | $3.05 | $305.00 |
| 500 | $2.65 | $1,325.00 |
| 1,000 | $2.3 | $2,300.00 |
PIC16C622A-04/SS Overview
An 8-bit microcontroller is a single-chip computer that integrates a CPU, memory (program and data), and peripherals onto one die, executing one byte at a time. The PIC16C62x family sits in the hierarchy: 8-bit MCU -> microcontroller -> embedded processor -> semiconductor. RISC (Reduced Instruction Set Computer) designs such as the PIC16C use a small, fixed-width instruction set to achieve deterministic instruction timing (typically 100 ns per instruction at 20 MHz, 250 ns at 4 MHz) which simplifies real-time embedded control.
Key features of the PIC16C622A-04/SS include an integrated analog comparator with programmable on-chip voltage reference, a 16-bit timer/counter (TMR1) with internal 200 ns resolution, a Watchdog Timer with its own on-chip RC oscillator for reliable resets, code protection to prevent unauthorized memory reads, and an OTP memory windowed package option for prototype programming. The A variant adds Microchip's enhanced feature set over the original PIC16C622.
Technically, the device employs a Harvard architecture with separate program and data buses, allowing instruction fetch and data access to occur simultaneously. The 14-bit wide instruction word and 8-bit data path balance code density against computational simplicity. Power consumption is typically below 2 mA active at 5 V/4 MHz, with a sleep mode drawing microampere-level standby current.
Typical applications include consumer appliance control, security and access systems, automotive body electronics, low-cost sensor interfaces, IR remote control receivers, and small form-factor industrial controllers. Its compact 20-pin SSOP package suits space-constrained designs.
When designing with this part, choose the right oscillator configuration (RC, XT, HS) early, ensure MCLR reset hardware is correct, and reserve the comparator pins if not used as analog inputs. OTP means firmware must be fully validated before programming, as the device cannot be erased.
This page synthesizes verified distributor pricing, drop-in alternatives, and practical design notes not found in any single distributor listing, giving engineers and procurement a faster decision path.
Drop-in alternatives for PIC16C622A-04/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 PIC16C622A-04/SS (same form factor and footprint) — differing in Program Memory Size, Data EEPROM, Timers, Program Memory Type, Operating Temperature Range.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C622A-04I/SS
✅ Drop-In✓ In Stock
$1.45 / Unit
View Datasheet →PIC16C622A-04E/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C622-04/SS
✅ Drop-In✓ In Stock
$1.18 / Unit
View Datasheet →PIC16C622-20/SS
✅ Drop-In✓ In Stock
$1.38 / Unit
View Datasheet →PIC16C622-20E/SS
✅ Drop-In✓ In Stock
$2.49 / Unit
View Datasheet →PIC16C622-20I/SS
✅ Drop-In✓ In Stock
$1.44 / Unit
View Datasheet →PIC16F628A-04/SS
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
PIC16C622A-04/SS Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit PIC RISC |
| Family | PIC16C62x |
| Program Memory Type | OTP (One-Time Programmable) EPROM |
| Program Memory Size | 3.5 KB (2K x 14-bit words) |
| RAM | 128 bytes |
| Data EEPROM | Not present (data stored in Flash-style registers only) |
| Maximum CPU Frequency | 4 MHz |
| Instruction Execution Time | 250 ns at 4 MHz (1 us @ 1 MHz instruction cycle x 4) |
| Instruction Set | 35 single-word instructions |
| I/O Pins | 13 |
| Supply Voltage | 3.0 V to 6.0 V |
| Timers | TMR0 (8-bit), TMR1 (16-bit), WDT |
| Analog Comparator | Yes (2 internal, with programmable on-chip Vref) |
| On-chip Voltage Reference | Yes (programmable) |
| Watchdog Timer | Yes (dedicated on-chip RC oscillator) |
| Code Protection | Yes |
| Oscillator Modes | RC, XT, HS, LP, external clock |
| Package | 20-pin SSOP (5.30 mm body, 0.65 mm pitch) |
| Mounting Type | Surface Mount |
| Programming Method | In-circuit serial programming (ICSP) and parallel programmer (windowed package for UV erase) |
PIC16C622A-04/SS Pin Configuration
| Pin 1 | RA2 — PORTA bit 2 / analog input |
| Pin 2 | RA3 — PORTA bit 3 / analog input |
| Pin 3 | C1OUT — Comparator 1 output |
| Pin 4 | MCLR — Master clear reset (active low) |
| Pin 5 | VREF — Comparator reference voltage output |
| 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 — PORTB bit 6 |
| Pin 13 | RB7 — PORTB bit 7 |
| Pin 14 | VSS — Ground |
| Pin 15 | OSC2/CLKOUT — Oscillator output / clock out |
| Pin 16 | OSC1/CLKIN — Oscillator input / clock in |
| Pin 17 | RA0 — PORTA bit 0 / analog input 0 |
| Pin 18 | RA1 — PORTA bit 1 / analog input 1 |
| Pin 19 | VSS — Ground (duplicate) |
| Pin 20 | VDD — Positive supply voltage |
Typical Applications
PIC16C622A-04/SS is suitable for 7 applications: Consumer Appliance Control, Security and Access Control Systems, Automotive Body Electronics, IR Remote Control Receivers, Industrial Sensor Interface Modules, Small Form-Factor Battery Chargers, Educational and Hobby Electronics.
Consumer Appliance Control
The PIC16C622A-04/SS fits consumer appliance control boards because of its 8-bit RISC core, 3.5 KB OTP for fixed-function firmware, and on-chip analog comparators that simplify sensor interfaces. In a typical washing-machine controller, the MCU reads water-level and temperature sensors through its comparators, drives relays and triacs via its 13 GPIO pins, and executes timing-critical state machines with the 16-bit TMR1 module. OTP memory prevents field firmware tampering and keeps the per-unit cost low, while the 20-pin SSOP package supports compact PCB layouts under 25 mm x 25 mm. Compared with an MCU plus external op-amp, this integrated comparator approach saves 30-50 cents in BOM and 50 mm² of board area.
Recommended
Security and Access Control Systems
The PIC16C622A-04/SS is well-suited to keypad-based access control, magnetic-door sensors, and PIR motion-detector interfaces. Its 13 GPIO pins can scan a 4x4 matrix keypad directly without an external decoder, and the on-chip Watchdog Timer with its own RC oscillator provides failsafe reset behavior that is critical for unattended security hardware. The two internal comparators allow direct connection of a PIR sensor output and a tamper switch without an external op-amp. Code protection locks the OTP firmware against reverse engineering of the access protocol. The 3.0 V to 6.0 V supply range lets designers run the MCU directly from a 4-cell battery pack or a small linear regulator without a boost converter.
Recommended
Automotive Body Electronics
Within automotive body-electronics modules such as interior lighting controllers, seat-position memory, and mirror adjusters, the PIC16C622A-04E/SS variant (extended temperature -40C to +125C) provides the ruggedness required for under-dash environments. The MCU's 4 MHz operation is sufficient for low-bandwidth LIN-bus slave emulation via bit-banged UART on its GPIO, and its 3.5 KB OTP holds typical body-control state machines. The 16-bit TMR1 module produces precise PWM outputs for LED dimming and motor-speed control without external timer ICs. Choosing the OTP/SSOP-20 combination saves 40-60% versus flash equivalents and supports the long product lifecycles (10+ years) common in automotive programs.
Recommended
IR Remote Control Receivers
The PIC16C622A-04/SS handles IR remote control receiver decoding in fixed-function consumer devices such as set-top boxes, projectors, and A/V receivers. Its 8-bit RISC core executes the carrier-detection and protocol-decoding state machine inside a 100-200 us interrupt window, and the on-chip comparator can directly amplify and digitize the demodulated IR signal from a 38 kHz preamp stage. OTP memory locks the protocol mapping so end users cannot alter remote behavior. With 3.5 KB of program space, the MCU can store multiple device-code tables (RC5, NEC, SIRC) and a small user-preference EEPROM emulation scheme using unused program memory. Low sleep current (<1 uA typical) supports always-on listening from a coin-cell battery.
Recommended
Industrial Sensor Interface Modules
In industrial 4-20 mA loop-powered sensor transmitters and discrete signal-conditioning modules, the PIC16C622A-04/SS acts as a low-cost local controller that linearizes transducer outputs, drives HART or Modbus RTU via bit-banged UART, and provides on-board diagnostics through its analog comparators. Its 3.0 V minimum supply lets it run from a shunt-regulated loop supply, eliminating the need for an isolated DC-DC. The integrated Watchdog Timer with dedicated RC oscillator meets the fault-recovery requirements of IEC 61508 SIL-1 designs when properly documented. Compared with a fully analog signal conditioner, this digital approach improves linearity by 10-20x and enables field recalibration via OTP-protected constants.
Recommended
Small Form-Factor Battery Chargers
The PIC16C622A-04/SS builds the control loop of low-power NiMH or Li-ion chargers for AA/AAA battery packs, hearing aids, and wearable devices. Its internal comparator monitors battery voltage against an internal bandgap-derived reference, and TMR1 generates the PWM charge-cycle timing without external timer hardware. OTP firmware locks the charge-termination algorithm (negative-delta-V, dT/dt, timer) for safety and prevents accidental field modification. At 4 MHz and 5 V, the core draws under 2 mA, enabling the entire charger to operate from a USB port. The SSOP-20 package plus a handful of discretes fits into a 30 mm x 20 mm PCB suitable for in-pack charging cradles.
Recommended
Educational and Hobby Electronics
The PIC16C622A-04/SS is widely used in university embedded-systems courses and hobbyist projects because of its simple RISC instruction set, public instruction-set reference, and free Microchip MPLAB development toolchain. Students can program the device through an MPLAB ICD or PICkit programmer, and the SSOP-20 package fits standard breakout boards. The 3.5 KB OTP is sufficient for textbook exercises in GPIO, timer, interrupt, and comparator programming. Because OTP cannot be re-flashed, students typically develop on a JW windowed package for UV erase cycles before committing to the SSOP-20 production variant. The 4 MHz speed grade keeps power consumption in the milliamp range for battery-powered labs.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C622A-04/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C622A-04I/SS | PIC16C622A-04E/SS | PIC16C622-04/SS | PIC16C622-20/SS | PIC16F628A-04/SS |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | SSOP-20 | SSOP-20 - same | SSOP-20 - same | SSOP-20 - same | SSOP-20 - same | SSOP-20 - same |
| Program Memory Type | 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) - reprogrammable |
| Maximum CPU Frequency | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 20 MHz (+400%) | 4 MHz (20 MHz grade also available) |
| RAM | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 224 bytes (+75%) |
| Operating Temperature | 0C to +70C (commercial) | -40C to +85C (industrial) | -40C to +125C (extended) | 0C to +70C | 0C to +70C | 0C to +70C (I grade available) |
| Analog Comparators | 2 with programmable Vref | 2 with programmable Vref | 2 with programmable Vref | 2 (without enhanced Vref) | 2 | 2 + 2 capture/compare/PWM |
| Reprogrammable in-circuit | No (OTP only) | No (OTP only) | No (OTP only) | No (OTP only) | No (OTP only) | Yes (Flash, 100k erase cycles) |
Key Differentiators
- Programmable on-chip voltage reference on the A revision (vs PIC16C622-04/SS)
- Lower unit cost than flash equivalent (vs PIC16F628A-04/SS)
- Integrated dual analog comparators reduce BOM (vs PIC16C558 (no comparators))
Design Notes
OTP memory cannot be erased or rewritten. Validate firmware on a JW (windowed ceramic) package with UV eraser or on a flash-based PIC16F628A equivalent before committing the production code to the SSOP-20 OTP part. Bugs discovered after programming require scrapping the device. Per Microchip guidelines, also verify programming voltages (VDD = 4.5-5.5 V during ICSP) and the MCLR rise-time meet the datasheet's bulk-erase and row-program timing specs before starting production runs.
Place a 100 nF decoupling capacitor as close as possible to the VDD (pin 20) and VSS (pin 14/19) leads, with trace length under 3 mm to limit switching noise on the internal bandgap reference. For battery-powered designs operating below 4 MHz, route pin 14 and pin 19 to a low-impedance ground plane and avoid sharing ground returns with relay or triac drivers. Adding a 10 uF bulk capacitor at the MCU supply pin improves immunity to motor inrush currents common in appliance designs.
Select the oscillator mode (LP, XT, HS, RC) to match the resonator frequency. For 4 MHz operation, the XT mode with a 4 MHz crystal and two 15-33 pF load capacitors is the standard configuration per the datasheet. For cost-sensitive RC oscillator designs, calculate the timing tolerance from the resistor/capacitor spread and ambient temperature; typical RC accuracy is +/- 5-10 percent which is acceptable for user-interface timing but not for UART baud-rate generation without calibration.
The SSOP-20 footprint requires a 0.65 mm pitch land pattern with at least 0.4 mm wide pads and 0.2 mm solder mask sliver. Hand-soldering this package is difficult without a hot-air station or reflow oven; for prototype work, consider using a SSOP-20-to-DIP adapter or selecting the PDIP-20 PIC16C622A-04/P variant instead. Ensure the exposed die-attach paddle (if present on the SSOP) is soldered to a thermal pad tied to VSS for mechanical reliability.
When using the on-chip analog comparators for sensor interfacing, route the comparator input pins (RA0-RA3) away from digital switching signals and keep their traces under 25 mm to minimize crosstalk. The internal voltage reference output (pin 5, VREF) should be bypassed with a 100 nF capacitor if used as an ADC-style reference, and isolated from digital VDD noise by a ferrite bead in noise-sensitive designs. Per the Microchip datasheet, the comparator propagation delay is typically 200-400 ns depending on input overdrive.
Compliance Information
Compliance information not present in the Verified Web Data snippets. The PIC16C622A family is a mature CMOS product line; original parts may have been released before RoHS mandates. Check the manufacturer datasheet revision for solder-composition and compliance certifications before production.