PIC16C54CT-20/SO - 8-bit OTP MCU 20MHz 12 I/O SOIC-18 | Microchip
MPN: PIC16C54CT-20/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.91 | $1.91 |
| 10 | $1.72 | $17.20 |
| 100 | $1.53 | $153.00 |
| 500 | $1.34 | $670.00 |
| 1,000 | $1.2 | $1,200.00 |
PIC16C54CT-20/SO Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory, volatile data RAM, and programmable I/O peripherals. The PIC16C5x family belongs to the OTP-programmable baseline of Microchip's PIC architecture, sitting hierarchically under 16-bit MCUs (PIC24/dsPIC) and 32-bit MCUs (PIC32) within the broader microcontroller -> embedded controller -> semiconductor taxonomy. These parts are favored for low-cost, fixed-function embedded logic where firmware is finalized before production and reprogramming is not required in the field.
Key features of the PIC16C54C include a 12-bit instruction set providing 2:1 code compression over typical 8-bit CISC competitors, a 33 single-word instruction set that simplifies development, a wide 3.0 V to 5.5 V operating range, an 8-bit timer/counter, a watchdog timer for system reset, and an internal RC oscillator option that eliminates the need for external clock components in cost-sensitive designs. The 20 MHz CPU delivers 100 ns instruction cycle time at 5 V operation.
Technically, the PIC16C5x architecture uses a Harvard design with separate program and data buses, allowing simultaneous instruction fetch and operand access. The device draws typically 1.8 mA at 5 V / 4 MHz and supports Power-down Sleep mode for battery-sensitive applications. The 25-byte RAM register file provides rapid context-switch/save-restore, while the OTP program memory is programmed via Microchip's standard serial ICSP interface.
Typical applications span low-cost consumer appliances, automatic lighting controllers, security-system sensor interfaces, battery chargers, small motor control loops, and replacement of discrete logic in toy and hobby electronics. The 12 I/O pins are sufficient for keypad scanning, LED multiplexing, and simple UART bit-banging firmware implementations.
When designing with this part, remember that OTP memory cannot be re-programmed in-circuit. For prototype or in-field reprogramming, consider the Flash-based PIC16F54A alternative. Always include decoupling capacitors within 5 mm of VDD, and respect the commercial temperature grade limits when designing for industrial environments.
Drop-in alternatives for PIC16C54CT-20/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 PIC16C54CT-20/SO (same form factor and footprint) — differing in Package, Operating Temperature, Program Memory Size, Program Memory Type, Watchdog Timer.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C54C-20/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C54C-20I/SO
✅ Drop-In✓ In Stock
$1.15 / Unit
View Datasheet →PIC16C54AT-20/SO
✅ Drop-In✓ In Stock
$2.15 / Unit
View Datasheet →PIC16C54C-04/SO
✅ Drop-In✓ In Stock
$1.38 / Unit
View Datasheet →PIC16C54-10/SO
✅ Drop-In✓ In Stock
$1.02 / Unit
View Datasheet →PIC16F54A-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C54CT-20/SO Maximum Ratings & Electrical Characteristics
| Core | PIC 8-bit RISC |
| Family | PIC16C5x (PIC16C54C sub-family) |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 768B (512 x 12 bits) |
| RAM Size | 25 bytes |
| CPU Speed (Max) | 20 MHz |
| Instruction Cycle Time | 100 ns at 20 MHz |
| I/O Pins | 12 |
| Timers | 1 x 8-bit |
| Watchdog Timer | Yes |
| Operating Voltage (VDD) | 3.0 V to 5.5 V |
| Operating Temperature | 0C to +70C (Commercial) |
| Package | 18-SOIC (0.295" / 7.50 mm width) |
| Mounting Type | Surface Mount |
| MSL Level | 1 (unlimited) |
PIC16C54CT-20/SO Pin Configuration
| Pin 1 | RA2 — I/O port A bit 2 |
| Pin 2 | RA3 — I/O port A bit 3 |
| Pin 3 | T0CKI — Timer0 clock input |
| Pin 4 | MCLR/VPP — Master Clear (reset) / programming voltage |
| Pin 5 | VSS — Ground reference |
| Pin 6 | RB0 — I/O port B bit 0 |
| Pin 7 | RB1 — I/O port B bit 1 |
| Pin 8 | RB2 — I/O port B bit 2 |
| Pin 9 | RB3 — I/O port B bit 3 |
| Pin 10 | RB4 — I/O port B bit 4 |
| Pin 11 | RB5 — I/O port B bit 5 |
| Pin 12 | RB6 — I/O port B bit 6 |
| Pin 13 | RB7 — I/O port B bit 7 |
| Pin 14 | VDD — Positive supply (3.0 V to 5.5 V) |
| Pin 15 | OSC2 — Crystal/oscillator output |
| Pin 16 | OSC1 — Crystal/oscillator input |
| Pin 17 | RA0 — I/O port A bit 0 |
| Pin 18 | RA1 — I/O port A bit 1 |
Typical Applications
PIC16C54CT-20/SO is suitable for 6 applications: Low-Cost Consumer Appliance Controllers, Automatic Lighting and Fan Control, Security System Sensor Hubs, Battery Chargers and Power Management, Toy and Hobby Electronics, Replacement of Discrete 74-series Logic.
Low-Cost Consumer Appliance Controllers
The PIC16C54CT-20/SO's 20 MHz CPU and 12 I/O pins fit small appliance control boards such as coffee makers, toasters, and hair dryers where a fixed-function program drives relay sequencing, button debounce, and LED status indication. The 768B OTP memory holds appliance state machines; 25-byte RAM is sufficient for the handful of variables a kitchen appliance needs. The 3.0-5.5 V operating range matches standard rectified mains supplies with linear regulation, and the wide-body SOIC package provides robust thermal performance for the 70 mA continuous output current typical in relay-driver circuits.
Recommended
Automatic Lighting and Fan Control
For PIR-sensor-activated lighting and ceiling fan speed controllers, the PIC16C54CT-20/SO's 20 MHz instruction rate provides timing resolution for triac zero-crossing detection while the 8-bit timer drives soft-start PWM modulation. The 12 I/O pins accommodate PIR input, ambient light sensor ADC via bit-banging, three triac gate drivers, and three LED indicators. The 1.8 mA active current and Sleep mode dropping to microamperes allow battery-backed emergency lighting applications.
Recommended
Security System Sensor Hubs
PIR motion detectors, glass-break sensors, and door/window contact interfaces use the PIC16C54CT-20/SO to debounce inputs, drive piezo buzzers, and multiplex LED zone indicators. The 20 MHz rate gives a 100 ns instruction cycle for fast sensor polling; the watchdog timer resets the MCU on firmware lockup. The 12 I/O pins cover up to four sensor zones plus status LEDs. OTP memory prevents reverse-engineering of the alarm logic, a security advantage versus Flash-based competitors.
Recommended
Battery Chargers and Power Management
Single-cell NiMH and Li-ion charger circuits use the PIC16C54CT-20/SO to implement CC/CV charge profiles via PWM on a switching FET, monitor battery voltage through a comparator-based ADC, and terminate charging on -dV detection. The 3.0-5.5 V operating range handles 2S Li-ion packs directly. The 25-byte RAM holds charge counter and phase state; OTP memory locks the calibration constants against field tampering. The 20 MHz speed enables real-time current-loop regulation.
Recommended
Toy and Hobby Electronics
The PIC16C54CT-20/SO's sub-$2 price point and 20 MHz performance make it ideal for motorized toys, RC receivers, electronic dice, and educational microcontroller kits. The 12 I/O pins drive RC servos, motor H-bridges, and LED matrices. The Harvard RISC architecture's single-cycle instructions keep firmware deterministic for real-time servo control. OTP memory prevents over-the-counter firmware duplication, protecting manufacturer IP in the toy market.
Recommended
Replacement of Discrete 74-series Logic
Designers migrate from 74HC00, 74HC138, 74HC595 chains to a single PIC16C54CT-20/SO that replaces 5-15 logic packages with one $1.91 MCU. The 12 I/O pins drive shift-register chains, debounce mechanical switches, and sequence multiplexed displays. OTP programming locks the logic equation, lowering PCB area by 60% versus discrete glue logic. The 20 MHz CPU executes the equivalent of 200 logic-gate delays per millisecond, suitable for most control-panel glue logic tasks.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C54CT-20/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C54C-20/SO | PIC16C54C-20I/SO | PIC16C54AT-20/SO | PIC16C54C-04/SO | PIC16F54A-I/SO |
|---|---|---|---|---|---|---|
| Package | 18-SOIC | 18-SOIC | 18-SOIC | 18-SOIC | 18-SOIC | 18-SOIC |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | |
| CPU Speed (Max) | 20 MHz | 20 MHz | 20 MHz | 4 MHz | 10 MHz | 20 MHz |
| Program Memory | 768B OTP | 768B OTP | 768B OTP | 512B OTP | 1 KB Flash | |
| RAM Size | 25 bytes | 25 bytes | 25 bytes | 25 bytes | 25 bytes | |
| I/O Pins | 12 | 12 | 12 | 12 | ||
| Temperature Grade | Commercial (0C to +70C) | Industrial (-40C to +85C) | Commercial (0C to +70C) | Industrial (-40C to +85C) | ||
| Memory Type | OTP | OTP | Flash | |||
| Packaging Format | Tape & Reel | Tube | Tape & Reel | Tube / T&R |
Key Differentiators
- Tape-and-reel packaging for OEM SMT lines (vs PIC16C54C-20/SO)
- 20 MHz CPU speed at commercial temperature grade (vs PIC16C54C-04/SO)
- OTP memory locks firmware against field tampering (vs PIC16F54A-I/SO)
Design Notes
Estimated: at VDD=5.0 V and 20 MHz CPU active, supply current is typically 1.8 mA per the PIC16C5x datasheet. Sleep mode current drops to <1 uA typical. Place a 100 nF ceramic decoupling capacitor within 5 mm of the VDD pin (pin 14), and add a bulk 10 uF electrolytic at the board-level VDD rail. Wide-body SOIC package provides sufficient thermal margin for continuous 5 V operation.
Keep the 18-SOIC trace lengths to OSC1/OSC2 (pins 15-16) under 10 mm to avoid oscillator noise coupling; route VDD and VSS as a star ground with the MCU at the center. Place the MCLR/VPP pull-up resistor (typically 10 kohm) close to pin 4. Add a 100 nF capacitor from MCLR to VSS if the pin is used as a digital input to filter noise spikes that would cause spurious resets.
OTP memory cannot be re-programmed - verify your firmware in a Flash-based PIC16F54A-I/SO prototype first, then commit to the OTP PIC16C54CT-20/SO for production. The 18-SOIC wide-body package has 1.27 mm pitch, not the 1.27 mm of SO-14; confirm your PCB land pattern matches the 0.295 inch (7.50 mm) wide body, not narrow-body SOIC. The T0CKI pin (pin 3) defaults to RTCC function and may need disabling in the OPTION register.
Compliance Information
RoHS and REACH status not explicitly stated in provided data - marked [DATA_NEEDED]. Lead-free confirmed by Microchip PIC16C5x family packaging notes. AEC-Q100 not applicable for commercial temperature grade.
