PIC16C63-20I/SO - 8-Bit 20MHz 7KB OTP MCU 28-SOIC | Microchip
MPN: PIC16C63-20I/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $10.83 | $10.83 |
| 10 | $9.74 | $97.40 |
| 100 | $8.66 | $866.00 |
| 500 | $7.59 | $3,795.00 |
| 1,000 | $6.5 | $6,500.00 |
PIC16C63-20I/SO Overview
What is a PIC16C microcontroller? The PIC16C family is Microchip's classic OTP-programmed mid-range 8-bit microcontroller line built around a Harvard-architecture RISC CPU. The hierarchy is: 8-bit MCU -> PIC16C family -> mid-range core -> embedded control. These devices use a separate program and data bus, an accumulator-based ALU, and a small instruction set (35 single-word instructions), making them deterministic and easy to program in assembly or C. OTP ROM versions like the PIC16C63 are intended for low- to medium-volume production where firmware is stable and field re-programmability is not required, distinguishing them from Flash-based PIC16F parts.
Key features include 35 single-word instructions, single-cycle execution for most instructions (program branches take two cycles), an industrial operating temperature range of -40C to +85C (the "I" suffix), an internal RC oscillator option, an analog comparator module, a USART module for asynchronous serial communication, and a synchronous serial port (SSP). The OTP memory is windowless in plastic SOIC packaging; the CDIP windowed variant allows UV erasure for engineering development. The device also integrates a watchdog timer with its own on-chip RC oscillator, three hardware timers (Timer0, Timer1, Timer2), and capture/compare/PWM (CCP) peripherals.
Typical applications include industrial control logic, appliance controllers, motor drive interfacing, sensor signal conditioning, and legacy embedded systems requiring OTP-programmed devices. The wide SOIC package and industrial temperature grade make it suitable for factory-floor equipment and instrumentation where reliability under thermal stress is required.
When designing with the PIC16C63-20I/SO, note that the device is in production but is being phased out for many designs in favor of Flash PIC16F73 or PIC16F877A drop-in equivalents. The OTP memory means firmware bugs cannot be patched without re-issuing silicon; budget engineering time accordingly.
This page synthesizes distributor pricing, drop-in Flash and OTP alternatives from the same PIC16C6X family, and practical engineering notes not found in the manufacturer datasheet alone.
Drop-in alternatives for PIC16C63-20I/SO — 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 PIC16C63-20I/SO (same form factor and footprint) — differing in Operating Temperature, Timers, Package, Core Architecture, Instruction Cycle.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C63-10/SO
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$7.1 / Unit
View Datasheet →PIC16C63-04I/SP
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$4.1 / Unit
View Datasheet →PIC16C63A-20I/SO
✅ Drop-In✓ In Stock
$5.41 / Unit
View Datasheet →PIC16C63-20/SO
✅ Drop-In✓ In Stock
$2.22 / Unit
View Datasheet →PIC16F73-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16F72-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C63-20I/SO Maximum Ratings & Electrical Characteristics
| Core | PIC16C (8-bit RISC) |
| Architecture | Harvard RISC, 14-bit instruction word |
| Program Memory | 7 KB (4K x 14) OTP ROM |
| RAM | 192 bytes |
| Data EEPROM | Not present (OTP device) |
| Maximum Clock Speed | 20 MHz |
| Supply Voltage | 4 V to 5.5 V |
| I/O Pins | 22 |
| Instruction Set | 35 single-word instructions |
| Instruction Cycle | 200 ns at 20 MHz (single cycle) |
| Timers | 3 (Timer0, Timer1, Timer2) |
| CCP Modules | 1 capture/compare/PWM |
| Serial Interfaces | USART (SCI), SSP (SPI/I2C) |
| Analog Comparator | Yes (2) |
| Watchdog Timer | Yes, with dedicated RC oscillator |
| Operating Temperature | -40C to +85C (industrial, "I" grade) |
| Package | 28-pin SOIC (0.295" / 7.50 mm width) |
| Mounting Type | Surface Mount |
| RoHS Status | Non-compliant (Sn/Pb lead finish, OTP industrial windowless variant) |
PIC16C63-20I/SO Pin Configuration
| Pin 1 | MCLR/Vpp — Master Clear (reset, active low) / Programming voltage input |
| Pin 2 | RA0/AN0 — PORTA bit 0 / Analog input 0 |
| Pin 3 | RA1/AN1 — PORTA bit 1 / Analog input 1 |
| Pin 4 | RA2/AN2 — PORTA bit 2 / Analog input 2 |
| Pin 5 | RA3/AN3/VREF — PORTA bit 3 / Analog input 3 / ADC voltage reference |
| Pin 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Pin 7 | RA5/AN4/SS — PORTA bit 5 / Analog input 4 / SPI slave select |
| Pin 8 | OSC1/CLKIN — Oscillator input / external clock input |
| Pin 9 | OSC2/CLKOUT — Oscillator output / clock output (Fosc/4) |
| Pin 10 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| Pin 11 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 output |
| Pin 12 | RC2/CCP1 — PORTC bit 2 / CCP1 PWM output |
| Pin 13 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Pin 14 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Pin 15 | RC5/SDO — PORTC bit 5 / SPI data out |
| Pin 16 | RC6/TX/CK — PORTC bit 6 / USART async transmit / USART sync clock |
| Pin 17 | RC7/RX/DT — PORTC bit 7 / USART async receive / USART sync data |
| Pin 18 | Vss — Ground reference |
| Pin 19 | Vdd — Positive supply (4V to 5.5V) |
| Pin 20 | RB0/INT — PORTB bit 0 / External interrupt input |
| Pin 21 | RB1 — PORTB bit 1 |
| Pin 22 | RB2 — PORTB bit 2 |
| Pin 23 | RB3 — PORTB bit 3 |
| Pin 24 | RB4 — PORTB bit 4 |
| Pin 25 | RB5 — PORTB bit 5 |
| Pin 26 | RB6 — PORTB bit 6 |
| Pin 27 | RB7 — PORTB bit 7 |
| Pin 28 | Vss — Ground reference |
Typical Applications
PIC16C63-20I/SO is suitable for 6 applications: Industrial Control Logic, Appliance Controllers, Sensor Signal Conditioning Hubs, Legacy Embedded Systems Maintenance, Motor Drive Interfacing, Asynchronous Serial Communication Hubs.
Industrial Control Logic
The PIC16C63-20I/SO fits industrial control logic applications because its -40C to +85C industrial temperature grade (the "I" suffix) survives factory-floor thermal stress while the 20 MHz RISC core executes deterministic logic within 200 ns per instruction. With 22 digital I/O pins it can drive relays, optocouplers, and discrete sensors directly, and the 192-byte RAM accommodates small state-machine firmware. The OTP memory is well suited to locked production firmware where security against reverse engineering matters more than field updateability, distinguishing it from Flash-based PIC16F equivalents. Designers should budget additional prototype runs because OTP firmware cannot be patched in-circuit once committed.
Recommended
Appliance Controllers
The PIC16C63-20I/SO is well-suited to appliance controllers such as washing machines, dishwashers, and HVAC actuators because the 20 MHz RISC core, three hardware timers (Timer0/1/2), and one CCP PWM module provide the deterministic timing needed for motor and valve sequencing. The 22 I/O pins interface directly with keypad matrices, seven-segment displays, and triac-driven loads, while the integrated analog comparator simplifies zero-cross detection for line-frequency synchronization. OTP memory locks production firmware permanently, preventing post-production tampering - a benefit in safety-critical appliances where firmware must match certified reference designs.
Recommended
Sensor Signal Conditioning Hubs
The PIC16C63-20I/SO serves as a sensor conditioning hub for multi-channel analog front-ends where its on-chip 8-bit ADC capability and two analog comparators enable threshold detection without external op-amps. The 20 MHz clock supports up to 20 ksps ADC sampling when processing temperature, pressure, or flow sensor arrays, and the 192-byte RAM is sufficient for moving-average filtering. The wide SOIC package eases hand-soldering and rework during prototyping, while the OTP memory suits cost-sensitive high-volume deployments. Note: this device lacks data EEPROM, so calibration constants must be stored in OTP program memory or external serial EEPROM.
Recommended
Legacy Embedded Systems Maintenance
The PIC16C63-20I/SO is the specified replacement part for maintenance and lifecycle extension of legacy embedded systems originally designed around the PIC16C6X family. Because its 28-SOIC pinout, peripheral set, and electrical characteristics match the original PIC16C63, repair depots can stock it as a direct substitute without modifying existing PCBs. The OTP memory matches the original design intent (no field firmware updates needed for legacy boards), while the industrial temperature grade ensures reliability in uncontrolled thermal environments. Cross-reference against installed firmware version before substitution.
Recommended
Motor Drive Interfacing
The PIC16C63-20I/SO fits motor drive interfacing where its 20 MHz core generates precise PWM via the CCP module, and its three timers enable quadrature encoder decoding for closed-loop speed control. With 22 I/O, it can interface directly to Hall-effect sensors, encoder channels, and half-bridge driver ICs without external logic. The OTP memory is suitable for production motor controllers where firmware is locked at release, and the -40C to +85C industrial range handles automotive underhood and industrial cabinet environments. Confirm PWM frequency matches motor inductance for the specific load.
Recommended
Asynchronous Serial Communication Hubs
The PIC16C63-20I/SO fits RS-232/RS-485 communication hub designs because its on-chip USART module supports asynchronous serial communication at standard baud rates up to 115.2 kbps when running at 20 MHz, while the SSP module adds SPI/I2C for peripheral expansion. With 22 I/O and 192 bytes RAM, the device can buffer short message frames and route between serial, SPI, and I2C domains. The 4-5.5V supply range accommodates both 5V logic rails and 3.3V systems via level shifters. The OTP memory is ideal for fixed-protocol hubs in metering and instrumentation.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C63-20I/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C63A-20I/SO | PIC16C63-20/SO | PIC16F73-I/SO | PIC16F72-I/SO | PIC16C63-10/SO |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SOIC (0.295") | 28-SOIC (0.295") - same | 28-SOIC (0.295") - same | 28-SOIC (0.295") - same | 28-SOIC (0.295") - same | 28-SOIC (0.295") - same |
| Program Memory | 7 KB OTP ROM | 7 KB OTP ROM | 7 KB OTP ROM | 7 KB Flash | 7 KB Flash | 7 KB OTP ROM |
| Maximum Clock Speed | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 10 MHz (-50%) |
| RAM | 192 bytes | 192 bytes | 192 bytes | 192 bytes | 192 bytes | 192 bytes |
| Data EEPROM | None (OTP device) | None | None | Yes | Yes | None |
| Operating Temperature | -40C to +85C (industrial) | -40C to +85C | 0C to +70C (commercial) | -40C to +85C | -40C to +85C | -40C to +85C |
| I/O Pins | 22 | 22 | 22 | 22 | 22 | 22 |
| ADC Channels | 8 (8-bit) | 8 (8-bit) | 8 (8-bit) | 5 (8-bit) | 8 (8-bit) | 8 (8-bit) |
Key Differentiators
- OTP memory locks production firmware permanently (vs PIC16F73-I/SO)
- Industrial temperature grade standard (vs PIC16C63-20/SO)
- Same-family migration path with Flash and errata corrections (vs PIC16C63A-20I/SO)
- Pinout compatibility with Flash PIC16F73 enables future field-update migration (vs PIC16F72-I/SO)
Design Notes
OTP memory cannot be patched. Once a PIC16C63-20I/SO is programmed, firmware bugs require re-issuing silicon - budget 2-3 prototype OTP iterations before committing to production volume. If field updateability matters, choose the Flash-based PIC16F73-I/SO drop-in equivalent instead. The /SO windowless package cannot be UV-erased; only the /JW (CDIP windowed) variant is erasable for engineering development.
Operating voltage is 4.0V to 5.5V - the device does not function at 3.3V. For mixed-voltage systems, use a 3.3V-to-5V level shifter on logic signals. Decouple Vdd (pin 19) and Vss (pin 18 and pin 28) with 100 nF ceramic capacitors placed within 5 mm of the package pins. The brown-out reset (BOR) module can be configured in the configuration bits to reset the device if Vdd drops below the BOR threshold (~4.0V).
Place the external crystal or ceramic resonator within 5 mm of OSC1 (pin 8) and OSC2 (pin 9), with short symmetric traces and a ground guard ring to minimize EMI. For 20 MHz operation, use a fundamental-mode crystal with 20-33 pF load capacitors matched to the crystal specifications. Route the MCLR/Vpp line (pin 1) with a 10 kohm pull-up to Vdd and a 100 nF decoupling cap to ground for noise immunity.
Configuration bits are NOT erased before shipping - Microchip ships the PIC16C63 with the watchdog timer enabled by default. Configure the WDTE, BOREN, PWRTE, and CP (code protect) bits before programming, or the device will reset unexpectedly or fail to start. Read the configuration bit map in the PIC16C6X datasheet carefully before programming.
The USART module on the PIC16C63 supports synchronous and asynchronous modes. For RS-485 communication, add an external MAX485 or similar transceiver - the MCU pins cannot drive 32 unit loads directly. For high-speed SPI (>4 MHz at 20 MHz Fosc), keep trace lengths under 50 mm and use series resistors (22-33 ohm) at driver outputs to dampen ringing.
Compliance Information
The PIC16C63-20I/SO uses Sn/Pb lead plating and is non-RoHS per the /SO ordering code; Microchip ships the 'I' industrial variant with traditional lead finish for industrial/commercial applications exempt from RoHS. AEC-Q100 not qualified - this part is not automotive-grade. REACH status per Microchip product declarations. Conflict minerals compliant per Microchip CMRT filings.
