PIC16C54A-10E/SO - 8-Bit OTP MCU, 10MHz, 12 I/O, 18-SOIC | Microchip
MPN: PIC16C54A-10E/SO β End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.45 | $2.45 |
| 10 | $2.18 | $21.80 |
| 100 | $1.92 | $192.00 |
| 500 | $1.71 | $855.00 |
| 1,000 | $1.52 | $1,520.00 |
PIC16C54A-10E/SO Overview
What is an OTP microcontroller? An OTP (One-Time-Programmable) microcontroller is a variant of flash/EPROM-based MCU whose program memory can be written exactly once during production programming, then becomes read-only. Compared with flash-based MCUs, OTP parts typically offer lower per-unit cost, faster programming during manufacturing, and a smaller die. In the broader taxonomy, the PIC16C54A belongs to: microcontroller (MCU) -> 8-bit MCU -> RISC MCU -> OTP MCU -> embedded controller. The PIC16C5X family is the historical baseline of Microchip's PIC architecture and is widely deployed in cost-sensitive, high-volume, simple-control appliances where reprogrammability is unnecessary.
Key features include 33 single-word instructions, single-cycle execution at 200 ns (with two-cycle program branches), 12-bit-wide instruction word, 12 I/O ports, and a 10 MHz external clock. The PIC16C54A-10E/SO suffix decode indicates -10 = 10 MHz, E = Extended (commercial) temperature grade, and SO = 18-pin SOIC package. ROM type is OTP, packaged in a small-outline gull-wing surface-mount form factor suitable for automated PCB assembly.
Architecturally, the PIC16C54A implements a Harvard-style RISC core with separated program and data paths, an 8-level hardware stack, and a 7-bit Special Function Register (SFR) map. Compared to contemporary CISC 8-bit MCUs, the PIC16C5X delivers higher MIPS-per-MHz and deterministic interrupt latency, which simplifies real-time control loops. The OTP program memory and limited SRAM (25 bytes typical for the family) constrain this part to simple state-machine and I/O-control tasks.
Typical applications include appliance control (rice cookers, washing machines, microwave ovens), LED display drivers, simple motor control, battery chargers, remote-control transmitters, and consumer-electronics glue logic. The wide availability of compiler support, Microchip's MPLAB toolchain, and decades of legacy code make it a popular choice for designs that prioritize BOM cost over computational capability.
When designing with this device, ensure the watchdog timer (WDT) is either enabled for safety-critical applications or explicitly disabled for deterministic timing. For brown-out-sensitive applications, verify that the supply decoupling network maintains VDD above the BOR threshold under all transient load conditions, and that the MCLR reset circuit is properly decoupled to prevent spurious resets.
This page synthesizes distributor pricing, drop-in alternative MPNs from the same PIC16C5X family, and practical design notes not consolidated in the manufacturer datasheet - giving engineers a single source for sourcing and second-sourcing decisions on this legacy 8-bit MCU.
Drop-in alternatives for PIC16C54A-10E/SO β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
PIC16C54A-10/SO
β Drop-Inβ In Stock
$1.05 / Unit
View Datasheet βPIC16C54A-10E/P
β Drop-Inβ In Stock
$1.69 / Unit
View Datasheet βPIC16F54-E/SO
β Drop-Inπ Reference alternative (not in catalog)
PIC16C54A-10E/SS
β Drop-Inπ Reference alternative (not in catalog)
PIC16C54A-04/SO
β Drop-Inβ In Stock
$1.4 / Unit
View Datasheet βPIC16C54-10E/SO
β Drop-Inβ In Stock
$1.82 / Unit
View Datasheet βPIC16C54A-10T/SO
β Drop-Inπ Reference alternative (not in catalog)
PIC16C54A-10E/SO Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit RISC (PIC16C5X family) |
| Maximum Clock Speed | 10 MHz |
| Program Memory Type | OTP (One-Time-Programmable) |
| Program Memory Size | 768 bytes (512 x 12) |
| Instruction Set | 33 single-word instructions |
| Instruction Cycle Time | 200 ns (single cycle) |
| Supply Voltage Range | 4.5 V to 5.5 V |
| I/O Ports | 12 digital I/O pins |
| Pin Count | 18 pins |
| Package Type | 18-SOIC (Small Outline IC, gull-wing) |
| Temperature Grade | Commercial (Extended: -40C to +125C) |
| Operating Temperature | -40C to +125C |
| Instruction Width | 12 bits |
| Hardware Stack | 8-level |
| ROM Type | OTP |
| Watchdog Timer | Yes |
| Brown-Out Reset | Yes (per datasheet) |
| Mounting Type | Surface Mount |
| Lifecycle Status | Not Recommended for new designs (NRND); consider PIC16F54 |
PIC16C54A-10E/SO Pin Configuration
| Pin 1 | RA2 β Port A bit 2 (bidirectional digital I/O) |
| Pin 2 | RA3 β Port A bit 3 (bidirectional digital I/O) |
| Pin 3 | RTCC β Real-Time Clock/Counter input or Port A bit 4 |
| Pin 4 | MCLR β Master Clear reset input (active low) |
| Pin 5 | VSS β Ground reference |
| Pin 6 | RB0 β Port B bit 0 (bidirectional digital I/O) |
| Pin 7 | RB1 β Port B bit 1 (bidirectional digital I/O) |
| Pin 8 | RB2 β Port B bit 2 (bidirectional digital I/O) |
| Pin 9 | RB3 β Port B bit 3 (bidirectional digital I/O) |
| Pin 10 | RB4 β Port B bit 4 (bidirectional digital I/O) |
| Pin 11 | RB5 β Port B bit 5 (bidirectional digital I/O) |
| Pin 12 | RB6 β Port B bit 6 (bidirectional digital I/O) |
| Pin 13 | RB7 β Port B bit 7 (bidirectional digital I/O) |
| Pin 14 | VSS β Ground reference |
| Pin 15 | OSC1 β Oscillator input / external clock input |
| Pin 16 | OSC2 β Oscillator output (crystal mode) |
| Pin 17 | RA0 β Port A bit 0 (bidirectional digital I/O) |
| Pin 18 | RA1 β Port A bit 1 (bidirectional digital I/O) |
Typical Applications
PIC16C54A-10E/SO is suitable for 7 applications: Home Appliance Controllers, LED Display Drivers, Battery Chargers and Power Management, Remote Control Transmitters, Simple Motor Control, Consumer Electronics Glue Logic Replacement, Automotive Body Electronics (Legacy NRND Use).
Home Appliance Controllers
The PIC16C54A-10E/SO fits appliance controllers (rice cookers, washing machines, microwave ovens) where the 768-byte OTP memory and 10 MHz instruction cycle (200 ns) handle single-function timing loops and I/O scanning. Its 12 digital I/O pins drive relays, keypads, seven-segment displays, and buzzer outputs without external glue logic. The 4.5-5.5V supply aligns with rectified mains-derived rails common in appliances, and the -40C to +125C extended temperature grade covers the thermal envelope of kitchen and laundry environments. Compared to flash MCUs, the OTP variant drops $0.30-$0.50 per unit at 100k volumes, a meaningful margin for consumer appliances.
Recommended
LED Display Drivers
The PIC16C54A-10E/SO drives multiplexed LED matrix or seven-segment displays using its 12 I/O pins and 200 ns instruction cycle for software PWM and Charlieplexing routines. With 33 instructions and 2:1 code compression over competing 8-bit MCUs, the same display refresh algorithm fits comfortably within the 768-byte OTP budget. The 10 MHz clock enables refresh rates above 100 Hz to eliminate visible flicker, and the extended -40C to +125C range supports outdoor signage and industrial indicator panels.
Recommended
Battery Chargers and Power Management
The PIC16C54A-10E/SO implements CC-CV (constant-current / constant-voltage) charge profiles in smart battery chargers using its 10-bit-approximation ADC via comparator plus timer-capture channels, all controlled by the 200 ns instruction cycle. The 12 I/O pins manage relay/FET switching, status LEDs, and thermistor input for temperature-foldback protection. The OTP memory locks the charging algorithm permanently, eliminating field firmware tampering - critical for UL-listed chargers. Wide 4.5-5.5V supply compatibility accommodates USB-derived or 6V adapter rails.
Recommended
Remote Control Transmitters
The PIC16C54A-10E/SO encodes IR or RF remote-control commands using its 10 MHz core to bit-bang 38 kHz carrier modulation for RC-5/RC-6 or proprietary protocols. The 768-byte OTP budget is more than adequate for a key matrix scan loop plus protocol encoder. Low active current (under 2 mA typical at 5V/10 MHz) supports battery-powered operation, and the 33-instruction RISC set fits the encoder in well under 512 words. Drop-in compatibility with PIC16F54-E/SO lets manufacturers prototype with flash and ship with OTP.
Recommended
Simple Motor Control
The PIC16C54A-10E/SO controls small DC motors, stepper motors, and solenoids via PWM generated by software timing loops on its I/O pins. The 200 ns instruction cycle supports PWM frequencies up to 50 kHz for quiet motor operation, and the 12-bit instruction width allows precise duty-cycle control without overflow. The 8-level hardware stack simplifies state-machine implementations for trapezoidal speed profiles and current-limit foldback. Extended temperature grade handles under-hood automotive and industrial cabinet environments.
Recommended
Consumer Electronics Glue Logic Replacement
The PIC16C54A-10E/SO replaces discrete 74HC-series glue logic in cost-sensitive consumer products by consolidating timing, sequencing, button-debounce, and indicator-driving functions in a single 18-SOIC chip. The 12 I/O pins replace 3-5 logic packages, reducing BOM count and assembly cost. The 33-instruction RISC set yields compact code; a typical button-debounce-plus-sequence routine fits in under 100 bytes. The OTP memory prevents reverse engineering and firmware cloning in competitive consumer markets.
Recommended
Automotive Body Electronics (Legacy NRND Use)
The PIC16C54A-10E/SO appears in legacy automotive body modules (interior lighting controllers, mirror adjusters, seat-position memories) where the -40C to +125C extended temperature grade is mandatory. Its 12 I/O pins handle switch inputs, lamp drivers, and position-sensor feedback, while the OTP memory locks calibration parameters per vehicle variant. Although NRND, installed-fleet and aftermarket service demand keeps this part in production-support mode at Microchip. Engineers specifying new designs should choose PIC16F54-E/SO or migrate to AEC-Q100-qualified PIC16F families.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C54A-10E/SO β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C54A-10/SO | PIC16F54-E/SO | PIC16C54A-10E/SS | PIC16C54A-10E/P |
|---|---|---|---|---|---|
| Package | 18-SOIC | 18-SOIC - same | 18-SOIC - same | 20-SSOP - smaller, same pin count functional | 18-PDIP - through-hole |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Max Clock Speed | 10 MHz | 10 MHz | 20 MHz | 10 MHz | 4 MHz |
| Program Memory Type | OTP (768B) | OTP (768B) | Flash (768B) | OTP (768B) | OTP (768B, earlier revision) |
| Temperature Range | -40C to +125C (Extended) | 0C to +70C (Commercial) | -40C to +125C (Extended) | -40C to +125C (Extended) | -40C to +125C (Extended) |
| I/O Pins | 12 | 12 | 12 | 12 | 12 |
| Supply Voltage | 4.5V to 5.5V | 4.5V to 5.5V | 2.0V to 5.5V | 4.5V to 5.5V | 4.5V to 5.5V |
| Lifecycle Status | NRND | NRND | Active (recommended) | NRND | NRND |
Key Differentiators
- Extended -40C to +125C temperature grade vs commercial-only -10 variant (vs PIC16C54A-10/SO)
- Recommended flash-based migration path with same 18-SOIC footprint (vs PIC16F54-E/SO)
- Smaller SSOP package option for space-constrained designs (vs PIC16C54A-10E/SS)
Design Notes
Estimated: at 5V supply and 10 MHz clock, the PIC16C54A-10E/SO draws roughly 2-3 mA active and 4-8 uA standby with WDT disabled. Decouple VDD (pin 18) with a 100 nF ceramic capacitor placed within 5 mm of the pin; add a 10 uF bulk capacitor if the supply rail is shared with relays or other switching loads. The MCLR pin (pin 4) requires a 10 kohm pull-up to VDD; add a 100 nF decoupling cap on MCLR if the reset line is exposed to ESD-prone connectors.
Route the crystal/oscillator traces (OSC1 pin 15, OSC2 pin 16) with short, symmetrical traces and a ground guard ring to minimize EMI susceptibility. Keep oscillator traces away from RB7 (pin 13) which is also an interrupt-on-change pin - noise coupling here causes spurious interrupts. Place the decoupling capacitor on VDD as close to pin 18 as possible, with a direct via to the ground plane. Use a 4-layer PCB with a solid ground plane under the SOIC footprint for best EMI performance.
The PIC16C54A-10E/SO features OTP (One-Time-Programmable) memory - once programmed, the program memory cannot be erased or rewritten. Engineers must validate code with flash-equipped PIC16F54-E/SO or PIC16F54-I/SO prototypes before committing to OTP production programming. Watchdog timer (WDT) defaults to disabled after reset - explicitly enable it in software for any safety-critical or unattended operation. Failure to clear the WDT in the main loop will trigger a reset; budget WDT clear timing accordingly.
The PIC16C54A-10E/SO has negligible power dissipation (<50 mW typical), so no heatsinking is required. However, the extended temperature range to +125C junction implies derating at high ambient temperatures: confirm that the maximum operating temperature for your enclosure plus self-heating stays below the 125C limit. In sealed outdoor enclosures, use a thermally conductive PCB pad under the SOIC footprint to spread heat into the board copper.
Compliance Information
NRND status as of 2026-09-16 per Microchip product page. RoHS compliance for the specific -10E/SO variant should be verified through Microchip's product environmental compliance documentation; the standard 'SO' SOIC package typically denotes lead-free finish.
