PIC16C54A-20I/P - 8-Bit 20MHz OTP MCU, 512x12 ROM | Microchip
MPN: PIC16C54A-20I/P ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.1 | $2.10 |
| 10 | $1.92 | $19.20 |
| 100 | $1.71 | $171.00 |
| 500 | $1.52 | $760.00 |
| 1,000 | $1.38 | $1,380.00 |
PIC16C54A-20I/P Overview
An 8-bit microcontroller (MCU) is a small computer-on-a-chip that integrates a CPU core, program memory, working RAM, I/O peripherals, and a clock generator into a single package. The PIC16C5X family belongs to the broader category of microcontrollers within the integrated-circuits taxonomy: microcontroller -> embedded controller -> semiconductor device. The 'C' in PIC16C5X denotes OTP EPROM program memory (one-time programmable, windowed for prototype erase). The 12-bit-wide instruction word gives 2:1 code compression over typical 8-bit CISC microcontrollers in the same price class, and the 8-bit data path keeps the core simple and deterministic for real-time control.
Key features include a RISC architecture with 33 single-word/cycle instructions, a two-level deep hardware stack, direct/indirect/relative addressing modes, an 8-bit real-time clock/counter (TMR0) with 8-bit prescaler, a watchdog timer with on-chip RC oscillator, and power-saving SLEEP mode. The industrial-grade -I/-P variant is rated for -40 °C to +85 °C operation and is delivered in a plastic DIP-18 through-hole package suited for breadboarding, legacy equipment, and industrial controls. A Microchip newer-device notice recommends PIC16F54 as a modern Flash replacement for new designs.
Typical applications include appliance controllers, simple sensor interfaces, LED drivers, battery chargers, automotive sub-systems, and industrial timer/counter logic where the small footprint, deterministic execution, and proven 5 V PIC ecosystem outweigh the need for larger memory or analog peripherals.
When designing with PIC16C54A-20I/P, note that OTP program memory cannot be re-programmed in-circuit; for production firmware revision flexibility consider the PIC16F54 (Flash) drop-in alternative in the same PDIP-18 footprint. Use a 4.7 kΩ pull-up on MCLR/VPP and provide a stable 20 MHz clock to OSC1 with appropriate capacitor selection per the crystal/ resonator manufacturer's load capacitance guidance.
The PIC16C54A-20I/P remains in active production for industrial and legacy designs, but Microchip's product page explicitly recommends PIC16F54 for new designs. This page synthesizes distributor pricing, drop-in PIC16C54/55/57 family alternatives, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for PIC16C54A-20I/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 PIC16C54A-20I/P (same form factor and footprint) — differing in Watchdog Timer, Operating Temperature, Timers, RoHS Status, Package.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C54C-20I/P
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C54A-04/P
✅ Drop-In✓ In Stock
$3.75 / Unit
View Datasheet →PIC16C54-10I/P
✅ Drop-In✓ In Stock
$1.18 / Unit
View Datasheet →PIC16C54A-20/SO
✅ Drop-In✓ In Stock
$1.4 / Unit
View Datasheet →PIC16F54-I/P
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C554-20I/P
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C54A-20I/P Maximum Ratings & Electrical Characteristics
| Architecture | 8-bit RISC (PIC16C5X family) |
| Instruction Word Size | 12-bit |
| Program Memory (ROM) | 512 x 12 words OTP EPROM |
| Data RAM | 25 bytes |
| Data EEPROM | Not present |
| Maximum Clock Frequency | 20 MHz |
| Instruction Cycle Time | 200 ns (at 20 MHz, 4 clock cycles per instruction) |
| Supply Voltage (VDD) | 4.5 V to 5.5 V |
| I/O Pins | 12 digital I/O |
| Timers | 1 x 8-bit Timer/Counter (TMR0) with 8-bit prescaler |
| Watchdog Timer | Yes, with on-chip RC oscillator |
| Hardware Stack | 2 levels |
| Addressing Modes | Direct, Indirect, Relative |
| Power-Saving Mode | SLEEP mode with WDT wake-up |
| Interrupt Controller | None (polled operation only on PIC16C5X base) |
| Operating Temperature | -40 °C to +85 °C (Industrial, '-I') |
| Package Type | PDIP-18 (Plastic DIP, through-hole) |
| Pin Count | 18 |
| RoHS Status | Compliant (Industrial -I/P variant) |
| AEC-Q100 Qualification | Not qualified |
PIC16C54A-20I/P Pin Configuration
| Pin 1 | RA2 — PORT A digital I/O bit 2 |
| Pin 2 | RA3 — PORT A digital I/O bit 3 |
| Pin 3 | RTCC — Timer/Counter (TMR0) clock input |
| Pin 4 | MCLR/VPP — Master Clear reset (active low) / programming voltage input |
| Pin 5 | VSS — Ground reference |
| Pin 6 | RB0 — PORT B digital I/O bit 0 |
| Pin 7 | RB1 — PORT B digital I/O bit 1 |
| Pin 8 | RB2 — PORT B digital I/O bit 2 |
| Pin 9 | RB3 — PORT B digital I/O bit 3 |
| Pin 10 | RB4 — PORT B digital I/O bit 4 |
| Pin 11 | RB5 — PORT B digital I/O bit 5 |
| Pin 12 | RB6 — PORT B digital I/O bit 6 |
| Pin 13 | RB7 — PORT B digital I/O bit 7 |
| Pin 14 | VDD — Positive supply (4.5 V to 5.5 V) |
| Pin 15 | OSC2 — Crystal/resonator output (also CLKOUT in RC mode) |
| Pin 16 | OSC1 — Crystal/resonator/external clock input |
| Pin 17 | RA0 — PORT A digital I/O bit 0 |
| Pin 18 | RA1 — PORT A digital I/O bit 1 |
Typical Applications
PIC16C54A-20I/P is suitable for 6 applications: Appliance Control Boards, Simple Sensor Interface Modules, LED Lighting Controllers, Battery Charger Control Logic, Automotive Interior Modules, Industrial Timer and Counter Modules.
Appliance Control Boards
The PIC16C54A-20I/P fits appliance controllers (washing machines, microwave ovens, coffee makers) where cost-down is critical and firmware is locked at production. Its 512 × 12-bit OTP memory holds typical user-interface and motor-control state machines, while the 20 MHz clock provides 200 ns instruction cycles for deterministic timing of TRIAC-driven heater elements and relay sequencing. Industrial-grade temperature rating (-40 °C to +85 °C) survives under-cabinet heat in kitchen appliances. The 12 digital I/O pins interface directly to LED indicators, keypad matrices, and zero-cross detectors. For firmware iteration during development, the PIC16F54-I/P drop-in (same PDIP-18 footprint) provides Flash reprogrammability without PCB rework.
Recommended
Simple Sensor Interface Modules
The PIC16C54A-20I/P serves sensor-interface front-ends (temperature, humidity, proximity) where the MCU simply reads a comparator or low-speed ADC and reports over a slow serial link or discrete I/O. The 8-bit core and TMR0 capture timing for pulse-counting flow meters or PIR motion sensors with sub-millisecond accuracy. Operating from a 4.5 V to 5.5 V supply matches typical 5 V sensor rails without extra LDO. With 25 bytes of RAM the device handles small state machines and calibration coefficients in software. For designs that require an integrated ADC, consider the PIC16C554/PIC16C558 family in the same PDIP-18 footprint.
Recommended
LED Lighting Controllers
The PIC16C54A-20I/P drives addressable LED strips and architectural lighting controllers with PWM bit-banging on its 12 digital I/O pins. At 20 MHz the core produces multiple software PWM channels for RGB color mixing without dedicated PWM peripherals. The OTP memory holds fixed lighting scenes and chase patterns in production, while industrial temperature rating supports outdoor signage and stage-lighting enclosures. A SLEEP mode plus watchdog timer enables battery-powered decorative controllers with sub-microamp standby. For RGBW designs needing more PWM channels, the PIC16F54-I/P (same PDIP-18 footprint) offers Flash memory for runtime scene updates.
Recommended
Battery Charger Control Logic
The PIC16C54A-20I/P implements state-machine-based charge controllers for lead-acid, NiCd, and NiMH battery packs. Its 8-bit TMR0 measures charge time, while the 12 I/O read voltage dividers and drive MOSFET gates through opto-isolated drivers. The 4.5 V to 5.5 V supply range accepts a regulated 5 V rail from a wall adapter. SLEEP mode between ADC samples reduces quiescent draw to support long shelf-life battery products. The PIC16C54C-20I/P drop-in alternative reduces power consumption further via the 'C' revision die shrink, useful for solar-powered remote chargers.
Recommended
Automotive Interior Modules
Although not AEC-Q100 qualified, the PIC16C54A-20I/P is widely used in non-safety automotive interior accessories such as LED ambient lighting, seat-position encoders, and accessory timers where its industrial temperature rating (-40 °C to +85 °C) covers cabin conditions. The 20 MHz clock decodes quadrature encoder inputs from seat-adjustment motors, while the watchdog timer recovers from load-dump transients. For safety-critical or under-hood applications requiring AEC-Q100, the PIC16F54 or PIC16F628A family should be substituted. The PDIP-18 through-hole package simplifies service and field-repair of legacy modules.
Recommended
Industrial Timer and Counter Modules
The PIC16C54A-20I/P provides deterministic timing for industrial counters, conveyor controllers, and machine-tool relays where 200 ns instruction cycles deliver tight timing resolution for sequence interlocking. Its 8-bit TMR0 with 8-bit prescaler measures events up to several seconds without software overhead. The PDIP-18 through-hole package withstands vibration in factory-floor equipment, and the industrial -40 °C to +85 °C temperature rating handles unheated enclosures. The two-level hardware stack is sufficient for simple state machines but requires careful coding discipline; the PIC16C554-20I/P upgrade (same PDIP-18 footprint) adds interrupts and a deeper stack for more complex sequencers.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C54A-20I/P — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C54C-20I/P | PIC16F54-I/P | PIC16C54-10I/P | PIC16C554-20I/P |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | PDIP-18 | PDIP-18 - same | PDIP-18 - same | PDIP-18 - same | PDIP-18 - same |
| Max Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 10 MHz (-50%) | 20 MHz |
| Program Memory | 512 x 12 OTP (768 B) | 512 x 12 OTP (768 B) | 512 x 12 Flash (768 B) | 512 x 12 OTP (768 B) | 512 x 14 OTP (896 B) |
| Data RAM | 25 bytes | 25 bytes | 25 bytes | 25 bytes | 80 bytes (+220%) |
| I/O Pins | 12 | 12 | 12 | 12 | 13 (+1) |
| Program Memory Type | OTP EPROM | OTP EPROM | Flash (reprogrammable) | OTP EPROM | OTP EPROM |
| Interrupt Controller | No | No | No | No | Yes (4 sources) |
| Supply Voltage | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 2.0 V to 5.5 V (wider) | 4.5 V to 5.5 V | 4.5 V to 5.5 V |
| Operating Temperature | -40 C to +85 C (Industrial) | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
Key Differentiators
- Officially recommended modern replacement available in same package (vs PIC16F54-I/P)
- Enhanced drop-in with interrupts and 220% more RAM (vs PIC16C554-20I/P)
- Lower-power die-shrink option in same footprint (vs PIC16C54C-20I/P)
Design Notes
Decouple VDD (pin 14) with a 100 nF ceramic capacitor placed within 5 mm of the supply pin, and add a 10 uF bulk tantalum or aluminum cap on the same rail. The PIC16C5X core draws up to ~10 mA active at 20 MHz with all I/O switching; bulk capacitance prevents VDD droop during large I/O transitions that could cause code mis-execution. Place the decoupling capacitor as close to the device as possible to minimize parasitic inductance on the supply lead.
Route the 20 MHz crystal traces between OSC1 (pin 16) and OSC2 (pin 15) as short as possible, surrounded by a ground guard ring or ground pour on both sides to prevent capacitive coupling to adjacent signals. Select load capacitors per the crystal manufacturer's CL specification, accounting for stray capacitance (~5 pF typical on a 2-layer board). For high-noise environments, add a 1 MΩ resistor across the crystal to bias the inverter into its linear region and guarantee oscillator startup.
Do not attempt to reprogram the PIC16C54A-20I/P - its OTP EPROM memory can be written exactly once. Use the PIC16F54-I/P for prototypes requiring firmware iteration, or the PIC16C54A windowed ceramic package (JW) for UV-erasable development. Also, the PIC16C5X family has a 2-level hardware stack only; deeply nested CALL routines will overwrite return addresses and cause code to mis-execute. Engineers migrating from PIC16F84 or PIC16F628A designs must refactor any subroutine nesting deeper than 2 levels.
MCLR (pin 4) must be pulled high with a 4.7 kΩ to 10 kΩ resistor tied to VDD to prevent spurious resets from electrical noise or ESD events. For in-circuit programming via VPP, add a clamp diode (1N4148) between MCLR and VDD if the programmer source impedance is high. The WDT is enabled by configuration bit; leaving it disabled saves ~5 uA but eliminates automatic recovery from software lockups - recommended practice is to enable the WDT and clear it from a single timer-interruptible watchdog refresh routine.
Compliance Information
RoHS and REACH compliance per Microchip product page; lead-free PDIP-18 industrial-grade variant. Not AEC-Q100 qualified - for automotive safety applications use PIC16F54, PIC16F628A, or other AEC-Q100 qualified parts. Halogen-free status not explicitly listed in the verified data.
