PIC16C54A-10/SO - 8-Bit 10MHz OTP MCU 12 I/O | Microchip
MPN: PIC16C54A-10/SO ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.85 | $1.85 |
| 10 | $1.65 | $16.50 |
| 100 | $1.42 | $142.00 |
| 500 | $1.2 | $600.00 |
| 1,000 | $1.05 | $1,050.00 |
PIC16C54A-10/SO Overview
A microcontroller is a single-chip computer that integrates a CPU core, program memory, working RAM, and configurable peripheral I/O into one package. Within the broader taxonomy, the PIC16C54A belongs to the 8-bit MCU class, which sits below 16-bit and 32-bit microcontrollers in performance but above simple logic ICs in functional density. The PIC architecture is a RISC-style design with 12-bit-wide instructions and an 8-bit data path, giving approximately 2:1 code density over many competitor 8-bit cores of the same era.
Key differentiating features include 12-bit instruction word, 33 single-word instructions, two-level deep hardware stack, direct/indirect/relative addressing modes, an 8-bit real-time counter (TMR0), and a watchdog timer with on-chip RC oscillator. The 10 MHz rating delivers approximately 250 ns instruction cycle time, which is sufficient for simple state machines, keypad scanners, LED drivers, and appliance timers. Operating voltage spans 3.0 V to 5.5 V (commercial) with low-power CMOS construction.
Architecturally, the device is OTP-based rather than flash-based, meaning the program memory is written once at production time and cannot be electrically erased. This makes the part cost-optimized for high-volume fixed-code products but unsuitable for field re-programming. Microchip documentation notes a recommended migration path to the flash-based PIC16F54 for new designs requiring reprogrammability, while the OTP PIC16C54A remains supported for existing production lines.
Typical applications include appliance control boards, HVAC sub-system controllers, simple sensor interfaces, security keypads, low-end toy electronics, and replacement of discrete logic in cost-down redesigns. The wide SOIC footprint simplifies hand-soldering and rework for prototyping and low-volume builds.
When designing in this part, remember the OTP limitation precludes field firmware updates - plan code revision strategy and validation up-front, or specify the PIC16F54 family for new designs. Decoupling should follow standard 0.1 µF ceramic on VDD, with optional bulk capacitance near the device.
This page synthesizes distributor availability, drop-in alternatives from the same PIC16C5x family and PIC16F54 successor family, and practical design guidance not aggregated on any single manufacturer or distributor product page.
Drop-in alternatives for PIC16C54A-10/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 PIC16C54A-10/SO (same form factor and footprint) — differing in Package, Program Memory Type, Core Architecture, Operating Temperature, Program Memory Size.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C54A-10I/SO
✅ Drop-In✓ In Stock
$2.1 / Unit
View Datasheet →PIC16C54A-04/SO
✅ Drop-In✓ In Stock
$1.4 / Unit
View Datasheet →PIC16F54-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C54A-04E/SS
✅ Drop-In✓ In Stock
$1.32 / Unit
View Datasheet →PIC16C54A-04/P
✅ Drop-In✓ In Stock
$3.75 / Unit
View Datasheet →PIC16C54A-10/SO Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit PIC RISC |
| Family | PIC16C5x |
| Instruction Word Width | 12-bit |
| Data Path Width | 8-bit |
| Maximum Clock Frequency | 10 MHz |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 768 B (512 x 12) |
| RAM Size | 25 B |
| Number of I/O Pins | 12 |
| Timers | 8-bit TMR0 + WDT |
| Hardware Stack Depth | 2 levels |
| Operating Voltage Range | 3.0 V to 5.5 V |
| Operating Temperature Range | 0 °C to +70 °C (commercial) |
| Package | 18-pin SOIC (SO) |
| Mounting Type | Surface Mount |
PIC16C54A-10/SO 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 — Master Clear (reset) input, active low |
| Pin 5 | VSS — Ground reference |
| Pin 6 | RB0 — 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 | VSS — Ground (secondary) |
| Pin 15 | OSC1 — Oscillator input / external crystal pin 1 |
| Pin 16 | OSC2 — Oscillator output / external crystal pin 2 |
| Pin 17 | VDD — Positive supply voltage |
| Pin 18 | RA1 — Bidirectional I/O port A bit 1 |
Typical Applications
PIC16C54A-10/SO is suitable for 6 applications: Appliance Control Boards, HVAC Sub-System Controllers, Simple Sensor Interfaces, Security Keypads and Access Control, Low-End Toy and Hobby Electronics, Discrete Logic Replacement / Cost-Down Redesigns.
Appliance Control Boards
PIC16C54A-10/SO's 10 MHz clock and 12-bit instruction set make it well-suited for washing machine, microwave, and dishwasher control boards requiring fixed firmware. The 768-byte OTP memory stores motor timing sequences and user-interface state machines, while 12 I/O pins drive relay drivers and LED indicators. OTP memory fits cost-optimized appliance lines where no firmware updates are needed post-production.
Recommended
HVAC Sub-System Controllers
The PIC16C54A-10/SO fits HVAC subsystem controllers such as damper actuators, zone valves, and small fan speed controllers where deterministic OTP code controls timing loops. The 8-bit TMR0 generates PWM periods for motor speed control while WDT provides recovery from sensor fault conditions. Low-power CMOS design suits always-on thermostat peripheral boards drawing under 2 mA active.
Recommended
Simple Sensor Interfaces
PIC16C54A-10/SO's 25-byte RAM and 12 I/O are appropriate for simple sensor interface modules reading thermistors, switches, or passive infrared detectors in security and industrial monitoring. The 10 MHz instruction cycle supports 250 ns response time for sensor polling loops, while OTP memory locks the calibration tables to prevent field tampering in commercial sensor networks.
Recommended
Security Keypads and Access Control
The PIC16C54A-10/SO drives 3x4 or 4x4 matrix keypads with its 12 I/O pins and runs code-comparison routines against stored OTP passcodes for electronic locks and alarm keypads. Hardware stack depth of 2 levels is adequate for flat keypad scanning routines without subroutine nesting, and the OTP memory prevents code extraction attacks in security applications where code confidentiality matters.
Recommended
Low-End Toy and Hobby Electronics
PIC16C54A-10/SO suits battery-powered toy and hobby electronics where its 3.0-5.5 V supply range and 12 I/O drive LED arrays, sound IC triggers, and simple motor H-bridges. The wide SOIC package simplifies hand-soldering in maker and educational kits, while OTP memory locks the toy behavior to prevent end-user modification. Cost under $2 in qty 100 supports high-volume consumer production.
Recommended
Discrete Logic Replacement / Cost-Down Redesigns
PIC16C54A-10/SO replaces discrete 74HC logic gates in cost-down redesigns of legacy products, consolidating multi-chip state machines into a single MCU. Its 250 ns instruction cycle matches typical 74HC logic propagation delays, simplifying timing migration from discrete logic. The 12-bit instruction word provides approximately 2:1 code compression over CISC 8-bit cores, reducing memory cost per feature.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C54A-10/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C54A-10I/SO | PIC16C54A-04/SO | PIC16F54-I/SO | PIC16C54A-04E/SS | PIC16C54A-04/P |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 18-pin SOIC | 18-pin SOIC | 18-pin SOIC | 18-pin SOIC | 20-pin SSOP | 18-pin PDIP |
| Max Clock Frequency | 10 MHz | 10 MHz | 4 MHz | 20 MHz | 4 MHz | 4 MHz |
| Program Memory | 768 B OTP | 768 B OTP | 768 B OTP | 768 B Flash | 768 B OTP | 768 B OTP |
| RAM Size | 25 B | 25 B | 25 B | 25 B | 25 B | 25 B |
| I/O Pins | 12 | 12 | 12 | 12 | 12 | 12 |
| Operating Temperature | 0 C to +70 C | -40 C to +85 C | 0 C to +70 C | -40 C to +85 C | -40 C to +125 C | 0 C to +70 C |
| Memory Type | OTP | OTP | OTP | Flash (reprogrammable) | OTP | OTP |
| Lifecycle Status | NRND | NRND | NRND | Active | NRND | NRND |
Key Differentiators
- Flash-based reprogrammability vs OTP memory (vs PIC16F54-I/SO)
- Higher clock speed vs slower same-family parts (vs PIC16C54A-04/SO)
- Industrial temperature range support (vs PIC16C54A-10I/SO)
Design Notes
PIC16C54A-10/SO uses One-Time-Programmable memory that cannot be electrically erased or rewritten. Engineers designing new products should plan code validation thoroughly before programming, or specify the flash-based PIC16F54 family for designs requiring in-system firmware updates. The 2-level hardware stack limits subroutine nesting depth to 2 - deeply recursive algorithms must be rewritten iteratively to fit this constraint.
Place a 0.1 µF ceramic decoupling capacitor as close as possible to the VDD pin (pin 17), plus a bulk 1-10 µF tantalum or ceramic capacitor on the same supply trace within 1 inch of the device. The PIC16C5x family has relatively high transient current during oscillator startup; insufficient decoupling can cause POR (power-on reset) failure on noisy supplies. Add a 10 kΩ pull-up on MCLR (pin 4) to prevent spurious resets.
Route the OSC1/OSC2 traces (pins 15-16) short and symmetric to minimize parasitic capacitance, with a ground guard ring around the crystal if high-noise digital traces are nearby. The 18-SOIC package leaves pads 14 and 18 close to the supply pins, so route VDD/VSS traces on a separate layer with via stitching every 200 mils for clean reference. Keep I/O traces away from the oscillator traces to avoid coupling.
Estimated: at 10 MHz clock, 5 V supply, and all I/O switching, the PIC16C54A-10/SO draws approximately 2-3 mA active, dissipating 10-15 mW - well below the SOIC thermal limit. No heatsink is required. For industrial temperature variants (-10I), verify junction temperature remains below +85 °C by measuring ambient and using the datasheet thermal resistance value of approximately 100 °C/W for the SOIC package.
Compliance Information
RoHS/REACH compliance status not explicitly confirmed in the provided web data - request latest compliance documentation from Microchip for EU-bound shipments. Not AEC-Q100 qualified; not designed for automotive safety-critical applications.
