PIC16C54AT-10E/SO - 8-Bit 10MHz OTP MCU 18-SOIC | Microchip
MPN: PIC16C54AT-10E/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.95 | $2.95 |
| 10 | $2.72 | $27.20 |
| 100 | $2.41 | $241.00 |
| 500 | $2.18 | $1,090.00 |
| 1,000 | $1.95 | $1,950.00 |
PIC16C54AT-10E/SO Overview
What is a PIC16C5x microcontroller? The PIC16C5x is Microchip's original baseline 8-bit OTP CMOS microcontroller family, widely used in legacy and cost-sensitive embedded applications. It belongs to the hierarchy microcontroller -> 8-bit MCU -> embedded controller -> semiconductor IC. PIC16C5x devices use 12-bit wide instructions that deliver 2:1 code compression versus other 8-bit MCUs in their class and feature a RISC-like instruction set of 33 single-word instructions where every instruction completes in a single cycle (200 ns) except program branches which take two cycles.
Key features of the PIC16C54AT-10E/SO include 768 bytes (512 x 12) of OTP program memory, 25 bytes of RAM, 12 general-purpose digital I/O pins arranged across two ports, an external oscillator interface, and a wide 4.5V to 5.5V single-supply operating range. The -10 speed grade denotes a 10 MHz maximum clock input. All I/O lines are bidirectional and individually configurable.
The architecture combines a Harvard-style separate program/data bus with a fixed 12-bit instruction width. Because the program memory is OTP, blank devices are factory-shipped unprogrammed and code is written once at production programming time. There is no on-chip debug or in-circuit programming interface on the PIC16C5x family - programming is performed on a device programmer before PCB mounting, which makes the part suited to high-volume fixed-function products rather than field-upgradeable firmware.
Typical applications include simple logic replacement in appliance control boards, hobbyist and educational microcontroller projects, fixed-function industrial timers and counters, low-cost LED drivers, sensor interface controllers, and embedded control sub-modules in larger products. The 12-bit compressed instruction set is also a teaching reference for RISC microcontroller fundamentals.
When designing with this device, allocate an external oscillator (RC, crystal, or resonator) because the PIC16C54AT-10E/SO has no internal oscillator. OTP memory cannot be erased or rewritten, so use the PIC16F54 flash-based equivalent for prototyping and field updates.
This page synthesizes distributor pricing, drop-in same-family alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for PIC16C54AT-10E/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 PIC16C54AT-10E/SO (same form factor and footprint) — differing in Package, Program Memory Size, Program Memory Type, Core Architecture, Instruction Cycle Time.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C54AT-10E/P
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C54AT-10/P
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C54A-10E/SO
✅ Drop-In✓ In Stock
$1.52 / Unit
View Datasheet →PIC16C54A-10/SO
✅ Drop-In✓ In Stock
$1.05 / Unit
View Datasheet →PIC16C54-10E/P
✅ Drop-In✓ In Stock
$1.72 / Unit
View Datasheet →PIC16C54AT-10/SS
✅ Drop-In✓ In Stock
$1.82 / Unit
View Datasheet →PIC16C54AT-10E/SO Maximum Ratings & Electrical Characteristics
| Core Processor | PIC |
| Core Size | 8-bit |
| Series | PIC 16C |
| Program Memory Type | OTP (One-Time-Programmable) |
| Program Memory Size | 768 B (512 x 12) |
| RAM Size | 25 B |
| Number of I/O | 12 |
| Clock Speed | 10 MHz |
| Instruction Cycle | 200 ns (single cycle) |
| Supply Voltage | 4.5 V to 5.5 V |
| Oscillator Type | External |
| Operating Temperature | -40C to +125C (Extended) |
| Package | 18-SOIC (0.295 inch, 7.50 mm width) |
| Mounting Type | Surface Mount |
PIC16C54AT-10E/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 | RTCC — Real-Time Clock/Counter input or RA4 |
| 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 | VDD — Positive supply voltage (4.5V to 5.5V) |
| Pin 15 | OSC2 — Oscillator crystal/external clock output |
| Pin 16 | OSC1 — Oscillator crystal/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
PIC16C54AT-10E/SO is suitable for 6 applications: Logic Replacement in Appliance Control, Educational and Hobbyist Microcontroller Projects, Fixed-Function Industrial Timers and Counters, Low-Cost LED Display and Lighting Controllers, Sensor Interface and Signal Conditioning Modules, Embedded Control Sub-Modules in Larger Products.
Logic Replacement in Appliance Control
The PIC16C54AT-10E/SO serves as a low-cost, deterministic replacement for discrete logic in appliance control boards. Its 33 single-word instructions and 200 ns instruction cycle deliver fast response for simple state machines - washing-machine lid-lock controllers, dishwasher cycle timers, microwave oven key-scan handlers. The 12 GPIO pins drive relays, triac optocouplers, and 7-segment LED displays directly. With OTP memory (768 bytes, 512 x 12) and no bootloader, the part achieves minimum unit cost in high-volume production, and its -40C to +125C extended temperature grade handles under-cabinet kitchen environments. Compared to CPLDs, the PIC16C54AT-10E/SO integrates timers, watchdog, and I/O in one package, simplifying BOM.
Recommended
Educational and Hobbyist Microcontroller Projects
The PIC16C54AT-10E/SO is a canonical teaching example for RISC microcontroller fundamentals. Its small 33-instruction PIC16C5x ISA is documented in undergraduate textbooks and provides an approachable learning curve compared to AVR or ARM Cortex-M. The 768-byte OTP program memory forces students to optimize code early, while 25 bytes of RAM teaches register file economics. Recommended companion parts include the PICkit 1/2/3 programmers, the MPLAB X IDE, and the Microchip MPASM assembler. The 18-SOIC variant drops easily onto breadboard-friendly breakout boards and DIP-adaptor PCBs. The 200 ns single-cycle execution at 10 MHz lets instructors demonstrate instruction-pipelining concepts clearly.
Recommended
Fixed-Function Industrial Timers and Counters
Industrial timer modules use the PIC16C54AT-10E/SO as a single-chip counter/timer/PWM controller. The 10 MHz clock provides 200 ns timing resolution, sufficient for relay debounce, motor soft-start ramp generation, and event counting up to several kHz. The 12 GPIO pins drive opto-isolated outputs, scan 4x3 matrix keypads, and read inductive proximity sensors. The 4.5 V to 5.5 V supply rails from common 5 V industrial backplanes. The extended -40C to +125C operating range covers factory-floor enclosures and outdoor cabinets. The OTP memory prevents inadvertent firmware modification in deployed equipment, a safety advantage in regulated environments.
Recommended
Low-Cost LED Display and Lighting Controllers
LED signage modules and decorative lighting drivers leverage the PIC16C54AT-10E/SO for chaser, fade, and pattern generation. The 12 GPIO pins drive Charlieplexed LED arrays up to 16 LEDs directly, or matrix-multiplexed 7-segment displays via external driver transistors. The 200 ns instruction cycle supports multiplex refresh rates above 100 Hz, eliminating visible flicker. The 768-byte OTP stores multiple lighting patterns. With OTP memory, manufacturers can lock proprietary animation sequences against copying. The 18-SOIC package fits inside small lighting fixtures and LED strips. Power consumption is below 2 mA active at 5 V, well suited to battery-driven seasonal lighting.
Recommended
Sensor Interface and Signal Conditioning Modules
Sensor front-end modules use the PIC16C54AT-10E/SO for digital conditioning of analog sensor signals. The 12 GPIO pins read digital temperature sensors (DS18B20), reed switches, Hall-effect sensors, and quadrature encoders; pair with external op-amp signal chains for thermocouples or strain gauges. The 768-byte OTP hosts linearization lookup tables for non-linear sensors. With no ADC on-chip, the PIC16C54AT-10E/SO pairs naturally with external ADC chips. The wide supply range (4.5 V to 5.5 V) supports common transducer excitation rails. Extended temperature grade suits automotive and outdoor environmental sensors.
Recommended
Embedded Control Sub-Modules in Larger Products
Multi-board products integrate the PIC16C54AT-10E/SO as a low-cost secondary processor handling auxiliary functions: button-matrix decoding in consumer electronics, fan-speed control in power supplies, battery-pack fuel-gauge interfaces in UPS systems, and IR remote-control receivers. The 8-bit PIC core offloads these deterministic tasks from a host processor. The 18-SOIC package fits on small daughterboards. With 25-byte RAM and 768-byte OTP, code complexity is bounded - a deliberate design choice that simplifies certification (FCCA, CE, UL). The 10 MHz clock provides sufficient throughput for UART (1200-9600 baud) and I2C master bit-banging without external peripherals.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C54AT-10E/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C54AT-10E/P | PIC16C54AT-10/P | PIC16C54A-10E/SO | PIC16C54A-10/SO | PIC16C54-10E/P | PIC16C54AT-10/SS |
|---|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 18-SOIC (SO) | 18-PDIP (P) | 18-PDIP (P) | 18-SOIC (SO) - same | 18-SOIC (SO) - same | 18-PDIP (P) | 20-SSOP (SS) |
| Program Memory | 768 B OTP (512 x 12) | 768 B OTP - same | 768 B OTP - same | 768 B OTP - same | 768 B OTP - same | 768 B OTP - same | 768 B OTP - same |
| Max Clock Speed | 10 MHz | 10 MHz - same | 10 MHz - same | 10 MHz - same | 10 MHz - same | 10 MHz - same | 10 MHz - same |
| Operating Temperature | -40C to +125C (Extended) | -40C to +125C - same | 0C to +70C (Commercial) | -40C to +125C - same | 0C to +70C (Commercial) | -40C to +125C - same | -40C to +125C - same |
| GPIO Count | 12 | 12 - same | 12 - same | 12 - same | 12 - same | 12 - same | 12 - same |
| Supply Voltage | 4.5V to 5.5V | 4.5V to 5.5V - same | 4.5V to 5.5V - same | 4.5V to 5.5V - same | 4.5V to 5.5V - same | 4.5V to 5.5V - same | 4.5V to 5.5V - same |
| Memory Type | OTP | OTP - same | OTP - same | OTP - same | OTP - same | OTP - same | OTP - same |
| Cross-Brand Drop-In | N/A (Microchip proprietary) | Same brand only | Same brand only | Same brand only | Same brand only | Same brand only | Same brand only |
Key Differentiators
- Tape-and-reel packaging for high-volume SMT assembly (vs PIC16C54A-10E/SO)
- Extended -40C to +125C operating temperature range (vs PIC16C54AT-10/P)
- Surface-mount 18-SOIC vs through-hole PDIP packaging (vs PIC16C54AT-10E/P)
Design Notes
PIC16C54AT-10E/SO requires a regulated 4.5V to 5.5V supply on VDD (pin 14); use a bulk 100 nF decoupling capacitor within 5 mm of VDD and a 10 uF tantalum or aluminum-polymer reservoir at the PCB power entry. Avoid inductive switching loads on the same rail without isolation. Per Microchip PIC16C5x datasheet, MCLR (pin 4) must be held high during normal operation via a 10 kohm pull-up to VDD; add a 100 nF cap to ground for noise immunity when long reset traces are present.
The PIC16C54AT-10E/SO requires an external oscillator on OSC1 (pin 16) and OSC2 (pin 15); there is no internal oscillator. For 10 MHz operation, use a fundamental-mode crystal with a load capacitance specified by the crystal manufacturer (typically 15-33 pF on each side). Series resistance of 100 ohm to 1 kohm may be required to limit crystal drive level. RC oscillator mode is acceptable for cost-sensitive designs but suffers +/- 5% frequency accuracy. Per Microchip datasheet, oscillator start-up time depends on crystal Q and load capacitance.
Three common pitfalls when designing with PIC16C54AT-10E/SO: (1) OTP memory cannot be re-programmed - field firmware updates are impossible, use PIC16F54 for prototypes; (2) the PIC16C5x family has no on-chip debug interface - rely on device programmers such as PICkit 3 for development; (3) I/O pin current is limited to 25 mA sink and 20 mA source per pin per Microchip datasheet, total package dissipation must not exceed 800 mW. Estimate: at 5 V VDD with 4 LEDs at 10 mA each, total GPIO current is 40 mA - well within limits.
For the 18-SOIC (SO) package, follow Microchip AN736 (PCB layout guidelines for PIC microcontrollers): keep traces on OSC1/OSC2 short and surrounded by ground pour to minimize noise pickup. Place decoupling caps with trace length under 3 mm from the MCU pins. Maintain a continuous ground plane under the IC body for thermal dissipation. For industrial environments with EMI, add a 100 ohm ferrite bead in series with VDD near pin 14. Estimated: a 2-layer FR4 board with 1 oz copper can dissipate approximately 500 mW ambient to free air.
Compliance Information
RoHS and lead-free status were not explicitly stated in the verified web data; refer to Microchip product page or full datasheet for definitive compliance statements. AEC-Q100 not applicable - this is a baseline MCU, not an automotive-qualified part. Conflict minerals compliant per Microchip corporate policy.
