PIC16C54C-40/P - 8-Bit OTP MCU, 20 MHz, 512B EPROM | Microchip
MPN: PIC16C54C-40/P ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.5 | $1.50 |
| 10 | $1.35 | $13.50 |
| 100 | $1.1 | $110.00 |
| 500 | $0.95 | $475.00 |
| 1,000 | $0.85 | $850.00 |
PIC16C54C-40/P Overview
What is a PIC16C5x microcontroller? The PIC16C5x family is the original baseline 8-bit RISC architecture from Microchip, featuring only 33 single-word instructions and a 12-bit instruction word. Compared with the later PIC16F and PIC18 families, the PIC16C5x family deliberately sacrifices advanced peripherals (no on-chip debug, no interrupts, no in-circuit re-programmability) in exchange for an extremely small die size, very low cost, and simple timing behavior. The 'C' revision in PIC16C54C refined the original 16C54A silicon for 4.5-5.5V operation with better brown-out characteristics and improved oscillator stability, and the -40 speed grade permits an external clock up to 20 MHz yielding roughly a 100 ns instruction cycle.
Key features include 12 I/O pins, two 8-bit timers, a watchdog timer, a power-on reset circuit, and a wide 4.5-5.5V supply voltage range with explicit 3.3V/5V dual-rail operation. The '40' speed suffix means 40 MHz oscillator at 5V (i.e., internal 4:1 divider yields a 10 MHz instruction rate, which is the 40 suffix naming convention used by Microchip). EPROM-based OTP memory allows pre-programming at the factory or field programming via a universal programmer, eliminating need for an external boot loader or serial interface. The 18-pin PDIP package supports hand-soldering and breadboard prototyping, making the device popular in educational, hobbyist, and legacy industrial designs.
Architecturally, the PIC16C54C uses a Harvard architecture with separate program (EPROM) and data (RAM) buses. The PIC16C5x core has no interrupt controller and uses a polled/sequential software design pattern. Program memory address space is 512 words wide (9-bit PC), data RAM is 25 bytes, and the stack is two-level hardware, restricting call nesting to two subroutine levels. Hardware multipliers and divide peripherals are absent; math is performed in software. These architectural constraints trade flexibility for deterministic real-time behavior at very low unit cost.
Typical applications include simple motor-control PWM, LED sequencers, low-end appliance controllers, hobby robotics, and educational microcontroller platforms. The wide 3.3V/5V supply tolerance also allows battery-backed designs and 5V industrial bus interfaces. Engineers often migrate to PIC16F54 (Flash) for active prototyping and PIC16C54C-40/P for production runs where OTP cost savings outweigh re-programmability.
When designing with this part, ensure external oscillator stability by using a properly sized load capacitor (typically 15-33 pF for a standard crystal). The lack of interrupts means polling loops dominate the firmware architecture; allocate worst-case timing in the main loop to maintain deterministic control. For new designs, also consider PIC16F54-I/P as a Flash-equivalent drop-in for prototyping, then qualify the OTP version for production.
This page synthesizes distributor pricing, parametric drop-in alternatives, application guidance, and design notes that go beyond the bare content of the manufacturer datasheet to help engineers choose, source, and apply the PIC16C54C-40/P with confidence.
Drop-in alternatives for PIC16C54C-40/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 PIC16C54C-40/P (same form factor and footprint) — differing in Core Architecture, Program Memory Size, Maximum Clock Frequency, Operating Temperature, Program Memory Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C54C-04/P
✅ Drop-In✓ In Stock
$1.71 / Unit
View Datasheet →PIC16C54C-20/P
✅ Drop-In✓ In Stock
$2.05 / Unit
View Datasheet →PIC16C54C-04E/P
✅ Drop-In✓ In Stock
$1.55 / Unit
View Datasheet →PIC16C54A-04/P
✅ Drop-In✓ In Stock
$3.75 / Unit
View Datasheet →PIC16F54-I/P
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C54C-40/P Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC16C5x 8-bit RISC |
| Program Memory Type | EPROM (OTP) |
| Program Memory Size | 512 words (9-bit PC) |
| Data RAM | 25 bytes |
| Data EEPROM | None |
| Instruction Set Width | 12-bit |
| Number of Instructions | 33 |
| Maximum Clock Frequency | 20 MHz external |
| Supply Voltage (Vdd) | 4.5 V to 5.5 V (3.3 V/5 V dual-rail) |
| I/O Pins | 12 |
| Timers | One 8-bit timer |
| Watchdog Timer | Yes (on-chip, software-controlled) |
| Power-on Reset | Yes |
| Interrupts | None (polled architecture) |
| Hardware Stack Depth | 2 levels |
| Oscillator Modes | RC, XT, HS, LP |
| Operating Temperature | 0C to +70C (commercial grade) |
| Package | 18-pin PDIP (P, windowed CERDIP variant) |
| Mounting Type | Through-Hole |
PIC16C54C-40/P Pin Configuration
| Pin 1 | RA2 — Bidirectional I/O port A bit 2 |
| Pin 2 | RA3 — Bidirectional I/O port A bit 3 |
| Pin 3 | RA4/T0CKI — Bidirectional I/O port A bit 4 / Timer0 clock input |
| Pin 4 | MCLR/VPP — Master Clear (active-low reset) / Programming voltage input |
| Pin 5 | VSS — Ground reference |
| Pin 6 | RB0/INT — Bidirectional I/O port B bit 0 |
| Pin 7 | RB1 — Bidirectional I/O port B bit 1 |
| Pin 8 | RB2 — Bidirectional I/O port B bit 2 |
| Pin 9 | RB3 — Bidirectional I/O port B bit 3 |
| Pin 10 | RB4 — Bidirectional I/O port B bit 4 |
| Pin 11 | RB5 — Bidirectional I/O port B bit 5 |
| Pin 12 | RB6 — Bidirectional I/O port B bit 6 |
| Pin 13 | RB7 — Bidirectional I/O port B bit 7 |
| Pin 14 | VDD — Positive supply voltage (4.5 V to 5.5 V) |
| Pin 15 | OSC2/CLKOUT — Oscillator crystal connection / clock output (Fosc/4) |
| Pin 16 | OSC1/CLKIN — Oscillator crystal connection / external clock input |
| Pin 17 | RA0 — Bidirectional I/O port A bit 0 |
| Pin 18 | RA1 — Bidirectional I/O port A bit 1 |
Typical Applications
PIC16C54C-40/P is suitable for 6 applications: Educational Microcontroller Trainer, Appliance Control (Low-End Washing Machine / Microwave Timer), Hobby Robotics and Small Motor Control, LED Sequencer and Decorative Lighting Controller, Industrial Sensor Interface Module, Legacy Replacement and Through-Hole Modernization.
Educational Microcontroller Trainer
The PIC16C54C-40/P is well suited to beginner microcontroller courses and undergraduate embedded systems laboratories where its 33-instruction baseline RISC architecture lets students learn register-level programming, polling loops, and timing analysis without interrupt-driven complexity. Its 20 MHz oscillator yields a 100 ns instruction cycle that is fast enough for LED blink, button-debounce, and simple serial-output experiments, yet slow enough to be debugged on a logic analyzer. The 18-pin PDIP package fits standard breadboards and solderless experimenter boards, while the 12 I/O pins are sufficient to drive 8 LEDs plus a 4-digit 7-segment display with multiplexing. Operating from a 5V rail, the part interfaces directly with TTL logic and 5V sensors. Compared to modern ARM Cortex parts, the PIC16C54C's deterministic behavior and small code footprint make it ideal for teaching real-time control fundamentals, and its low cost allows each student to own a programmable device.
Recommended
Appliance Control (Low-End Washing Machine / Microwave Timer)
The PIC16C54C-40/P's 12 I/O pins, single 8-bit timer, watchdog, and small form factor make it a classic choice for low-end white-goods controllers such as microwave oven keypads, washing-machine cycle timers, and rice-cooker thermostats. The OTP EPROM enables factory programming of fixed appliance cycles at scale, eliminating field re-programming costs and protecting firmware IP. The 4.5-5.5V supply range accepts a rectified 5V rail directly from a small linear transformer, and the 20 MHz clock supports simple PWM for buzzer tones and triac-driven heater control. The polled-architecture simplicity translates to deterministic real-time behavior, which is critical for safety timers in cooking and cleaning appliances. Compared to more expensive PIC16F or PIC18 parts, the PIC16C54C-40/P delivers lower BOM cost in high-volume appliance production.
Recommended
Hobby Robotics and Small Motor Control
The PIC16C54C-40/P can drive small DC motors, hobby servos, and stepper motors via discrete transistor H-bridges, leveraging its 20 MHz clock to generate PWM with sufficient resolution for toy robots and model trains. The 12 I/O pins can interface with two quadrature encoders plus four PWM channels for differential-drive robot bases, while the watchdog timer protects against firmware lockup during autonomous navigation. The OTP EPROM allows hobby robot vendors to ship pre-programmed controllers without exposing source code, while the 18-pin PDIP package enables easy rework on perf-board prototyping. The polled architecture is well suited to simple FSM-based motion controllers. For higher-volume production of robotic toys, the PIC16C54C-40/P's low per-unit cost is decisive, while the PIC16F54-I/P variant is recommended for prototype iteration.
Recommended
LED Sequencer and Decorative Lighting Controller
The PIC16C54C-40/P is widely used in LED chaser circuits, holiday light controllers, and simple dot-matrix displays because its 12 I/O pins can directly drive 8-12 LEDs or scan a small 7-segment or 8x8 matrix without external logic. The 20 MHz instruction rate supports software-driven Charlieplexing and PWM dimming, while the watchdog timer prevents stuck patterns in unattended installations. The 5V supply rail matches standard LED strip drivers and TTL-level shifters. The OTP EPROM lets manufacturers pre-bake specific light shows without firmware-extraction risk. Compared to addressable-LED controllers like the WS2811, the PIC16C54C offers much lower cost for traditional non-addressable decorative LED strings and can drive high-current LEDs via discrete MOSFETs.
Recommended
Industrial Sensor Interface Module
The PIC16C54C-40/P is suitable for low-cost industrial sensor signal-conditioning and discrete-logic replacement modules in factory automation. Its 12 I/O pins can read multiple dry-contact or 5V sensor inputs and drive relay or optocoupler outputs, replacing legacy 74HC-series discrete logic with programmable intelligence at lower cost. The 4.5-5.5V supply rail accepts 5V industrial backplanes, and the watchdog timer ensures fault-recovery in unattended factory environments. The OTP EPROM prevents unauthorized firmware modification. The extended-temperature -40C-to-+85C PIC16C54C-40I/P variant is required for factory-floor deployment. Compared to PLCs, the PIC16C54C-40/P provides a programmable alternative at a fraction of the cost, while offering better real-time determinism than microcontroller modules with interrupts.
Recommended
Legacy Replacement and Through-Hole Modernization
The PIC16C54C-40/P's 18-pin PDIP through-hole package remains critical for legacy industrial control boards, test fixtures, and educational trainers where through-hole components are required for hand-soldering, mechanical robustness, or compatibility with vintage PCB designs. Many legacy production lines still use through-hole PIC16C5x parts, and the PIC16C54C-40/P continues to be a reliable, active-lifecycle source for these designs. Its OTP EPROM enables factory pre-programming of fixed firmware. New designs needing surface-mount packaging should migrate to the PIC16C54C-20I/SS or PIC16F54-I/SS. The PDIP form factor also makes the part ideal for field serviceability in industrial controllers where a socketed DIP can be swapped without rework.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C54C-40/P — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C54C-04/P | PIC16C54C-20/P | PIC16C54C-04E/P | PIC16C54A-04/P | PIC16F54-I/P |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 18-pin PDIP | 18-pin PDIP - same | 18-pin PDIP - same | 18-pin PDIP - same | 18-pin PDIP - same | 18-pin PDIP - same |
| Program Memory | 512B EPROM (OTP) | 512B EPROM (OTP) | 512B EPROM (OTP) | 512B EPROM (OTP) | 512B EPROM (OTP) | 512B Flash (re-programmable) |
| Maximum Oscillator Frequency | 20 MHz | 4 MHz | 20 MHz | 4 MHz | 4 MHz | 20 MHz |
| Operating Temperature | 0C to +70C | 0C to +70C | 0C to +70C | -40C to +125C | 0C to +70C | -40C to +85C |
| I/O Pins | 12 | 12 | 12 | 12 | 12 | 12 |
| Interrupts | No (polled) | No (polled) | No (polled) | No (polled) | No (polled) | No (polled) |
| In-Circuit Re-Programming | No (OTP only) | No (OTP only) | No (OTP only) | No (OTP only) | No (OTP only) | Yes (ICSP via Flash) |
| Approximate Unit Price (qty 1) | $1.50 | Lower (slower speed grade) | Similar | Higher (extended temp) | Similar | Higher (Flash memory) |
Key Differentiators
- Lowest unit cost among PIC16C5x PDIP variants at high volume (vs PIC16F54-I/P)
- 20 MHz maximum oscillator with same 18-pin PDIP footprint as 4 MHz -04 grade (vs PIC16C54C-04/P)
- C-suffix silicon refinements over A-suffix (vs PIC16C54A-04/P)
Design Notes
Decoupling capacitor placement is critical for PIC16C54C-40/P designs. Place a 100 nF ceramic decoupling capacitor as close as possible to the VDD pin (pin 14), with the VSS ground trace routed directly to the VSS pin (pin 5) to minimize digital switching noise on the POR and oscillator blocks. Use 15-33 pF load capacitors (CL) for a standard quartz crystal at the OSC1/OSC2 pins (15/16), with the exact value chosen from the crystal manufacturer's datasheet for the target frequency. For high-speed HS oscillator mode, keep the oscillator traces short and surrounded by a ground guard ring to reduce EMI susceptibility.
The PIC16C5x baseline architecture has no interrupt controller and only a two-level hardware stack. Structure firmware as a polling main loop with explicit timing budgets, and limit subroutine call nesting to two levels to avoid stack overflow. The watchdog timer should be enabled with a typical postscaler setting for production builds (e.g., 18 ms nominal WDT period), but disabled during intentional long delays such as EPROM programming cycles. Because the architecture lacks interrupts, all real-time events (button presses, ADC completions on external ADC, communication timing) must be polled. Allocate worst-case latency budgets in the main loop and verify with a logic analyzer or oscilloscope.
The 18-pin PDIP footprint requires through-hole PCB design with 0.1 inch (2.54 mm) hole pitch and a minimum pad diameter of 1.7 mm to accommodate standard 0.6 mm leads. Place MCLR/VPP (pin 4) with a 10 kohm pull-up to VDD and a 100 nF capacitor to VSS for proper reset behavior. Reserve space for an optional ICSP header even though PIC16C54C does not support in-circuit serial programming; the header can be used with a universal programmer clip for factory programming. Add a ferrite bead or series inductor on the VDD trace if the supply rail is shared with inductive loads like relays or solenoids to prevent supply noise from resetting the MCU.
Common design pitfalls with PIC16C54C-40/P include: (1) forgetting that the PIC16C5x architecture has no interrupts and structuring firmware as if it did, leading to missed events; (2) leaving the WDT permanently enabled and experiencing unintended resets in long EPROM-erase/UV-exposure cycles; (3) using a non-zero PORTB pull-up configuration that conflicts with the open-drain output mode on certain pins; (4) exceeding the maximum source/sink current of 25 mA per I/O pin or 100 mA total port current, which can damage the device; (5) failing to disable the watchdog during long delay loops (the WDT can fire after ~18 ms and reset the MCU mid-cycle). Always consult the Microchip PIC16C5x family datasheet errata for known silicon issues specific to the PIC16C54C revision.
Compliance Information
RoHS, REACH, and lead-free status are not explicitly stated in the verified web data and should be confirmed directly with Microchip. The PIC16C54C-40/P is a through-hole PDIP part, and older Microchip EPROM-based parts may not be RoHS compliant depending on production date. AEC-Q100 is not applicable to this commercial-grade 8-bit MCU; automotive applications require AEC-Q100 qualified parts such as PIC16F系列 with -Q1 suffix.
