PIC16C54CT-20E/SS - 8-bit OTP MCU, 20MHz, 768B | Microchip
MPN: PIC16C54CT-20E/SS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.95 | $2.95 |
| 10 | $2.65 | $26.50 |
| 100 | $2.34 | $234.00 |
| 500 | $2.1 | $1,050.00 |
| 1,000 | $1.89 | $1,890.00 |
PIC16C54CT-20E/SS Overview
What is an 8-bit OTP microcontroller? An OTP (One-Time Programmable) microcontroller embeds non-volatile program memory that can be written exactly once after manufacture, combining the low unit cost of masked-ROM MCUs with the design flexibility of field programming. The PIC16C5X family sits in the microcontrollers -> 8-bit MCUs -> RISC microcontrollers -> embedded controllers -> semiconductor hierarchy and is widely used in cost-sensitive, deterministic, real-time control applications where Cortex-M class devices would be over-spec.
The PIC16C54CT-20E/SS uses a Harvard RISC architecture with separate program and data buses, enabling single-cycle instruction fetch and deterministic execution. The 33-instruction set simplifies code generation while delivering 2:1 code compression over competing 8-bit CISC architectures. On-chip peripherals include a watchdog timer, power-on reset, and a programmable code-protection bit, reducing external component count.
Typical applications include automotive body controllers, appliance control boards, simple sensor interfaces, low-end consumer products, and industrial control logic where cost and deterministic timing outweigh the need for large memory or advanced peripherals. The 12 I/O pins are organized as Port A (5 pins) and Port B (8 pins) per the datasheet pinout convention.
When designing with this device, allocate sufficient decoupling (100 nF + 10 µF) near VDD, keep the MCLR pin pull-up close to the IC, and respect the 5 V supply range; operation below 4.5 V is not guaranteed. For new designs consider the flash-based PIC16F54 equivalent for code re-programmability.
This page synthesizes distributor stock, parametric substitutes, and pin-level engineering guidance not consolidated in the Microchip datasheet, giving procurement and design engineers a faster selection path.
Drop-in alternatives for PIC16C54CT-20E/SS — 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 PIC16C54CT-20E/SS (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:
PIC16C54C-20E/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C54C-20I/SS
✅ Drop-In✓ In Stock
$1.74 / Unit
View Datasheet →PIC16C54A-20E/SS
✅ Drop-In✓ In Stock
$2.05 / Unit
View Datasheet →PIC16C54A-20I/SS
✅ Drop-In✓ In Stock
$2.51 / Unit
View Datasheet →PIC16C54CT-04/SS
✅ Drop-In✓ In Stock
$1.38 / Unit
View Datasheet →PIC16C54CT-20E/SO
✅ Drop-In✓ In Stock
$2.1 / Unit
View Datasheet →PIC16C54CT-20E/SS Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit PIC RISC (Harvard) |
| Series | PIC® 16C (PIC16C5X family, PIC16C54C die) |
| Program Memory Type | OTP EPROM (One-Time Programmable) |
| Program Memory Size | 768 B (512 x 12 words) |
| Instruction Word Width | 12 bits |
| RAM Size | 25 B |
| Maximum Clock Frequency | 20 MHz |
| Instruction Cycle Time | 200 ns at 20 MHz |
| Number of I/O Pins | 12 |
| Supply Voltage (VDD) | 4.5 V to 5.5 V |
| Operating Temperature | -40 °C to +125 °C (TA) |
| Package | 20-pin SSOP (0.209", 5.30 mm body width) |
| Mounting Type | Surface Mount (Gull Wing) |
| Number of Instructions | 33 |
| On-chip Peripherals | Watchdog Timer, Power-On Reset, Code Protection |
| Speed Grade Suffix | 20E (20 MHz, Extended temp) |
| Compliance | RoHS compliant per Microchip product page |
PIC16C54CT-20E/SS 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/INT — Bidirectional I/O Port B bit 0 / External interrupt |
| 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 reference (secondary) |
| Pin 15 | OSC2/CLKOUT — Oscillator crystal output / Clock out (Fosc/4) |
| Pin 16 | OSC1/CLKIN — Oscillator crystal input / External clock input |
| Pin 17 | RA0 — Bidirectional I/O Port A bit 0 |
| Pin 18 | RA1 — Bidirectional I/O Port A bit 1 |
| Pin 19 | VSS — Ground reference |
| Pin 20 | VDD — Positive supply voltage (4.5 V to 5.5 V) |
Typical Applications
PIC16C54CT-20E/SS is suitable for 6 applications: Automotive Body Electronics, Appliance Control Boards, Low-End Consumer Products, Industrial Sensor Interfaces, Simple Motor and Relay Control, Security and Access-Control Panels.
Automotive Body Electronics
The PIC16C54CT-20E/SS fits automotive body controllers — seat controllers, mirror adjusters, and central-locking modules — where its -40 °C to +125 °C extended temperature rating, 20 MHz deterministic core, and 12 GPIO are sufficient. The 33-instruction set executes logic decisions in a single 200 ns cycle, well below typical 10 ms body-control loop deadlines. With 768 B of OTP, the device can host small state machines, key-debounce routines, and PWM routines for LED or motor control without external memory. Compared with switching to a Cortex-M0+, the PIC16C54CT-20E/SS delivers sub-$2 unit cost at 1 kpcs while drawing under 2 mA active, easing thermal design in enclosed mirror housings.
Recommended
Appliance Control Boards
In white-goods appliances such as microwave ovens, washing machines, and dishwashers, the PIC16C54CT-20E/SS serves as the user-interface and timing controller. Its 12 I/O pins directly drive 7-segment LED displays, keypads, and triac-fired relays without external glue logic. The 20 MHz core handles line-frequency zero-cross detection and triac phase-angle control with 200 ns resolution, sufficient for 60 Hz / 120 Hz dimmer and heater regulation. OTP memory is well-matched to mature, never-updated appliance firmware, and the 20-SSOP footprint fits the dense PCB layouts common to control panels. Combined with a Microchip HVLC driver companion, it forms a complete BOM-friendly solution.
Recommended
Low-End Consumer Products
For toys, remote controls, novelty lighting, and other cost-driven consumer devices, the PIC16C54CT-20E/SS provides an optimal cost-per-function balance. Its 768 B OTP memory holds small fixed-pattern routines such as IR remote decoding, chase-pattern LED sequencing, or simple sound-effect generation. The 25-byte RAM supports stack-based subroutines and a handful of state variables. Combined with the internal watchdog timer and power-on reset, the device needs no external supervisory components, reducing BOM cost. The 20-SSOP package offers a small footprint ideal for handheld form factors.
Recommended
Industrial Sensor Interfaces
The PIC16C54CT-20E/SS acts as a low-cost sensor-conditioning MCU in industrial 4-20 mA loops, simple limit-switch controllers, and counter/timer modules. Its 12 GPIO can read multiple digital sensors and drive optocouplers, while the 20 MHz core performs debouncing, filtering, and pulse counting at rates up to 5 MIPS. The extended -40 °C to +125 °C operating range allows deployment near motors, hydraulics, or outdoor enclosures. The 4.5 V to 5.5 V supply range matches 5 V regulated industrial rails without needing a separate LDO, simplifying board layout and reducing component count.
Recommended
Simple Motor and Relay Control
For low-power brushed DC motors, solenoids, and small relay-driven actuators, the PIC16C54CT-20E/SS provides adequate processing power at minimum cost. Its 12 GPIO can source or sink enough current to drive logic-level MOSFETs through gate resistors, and the 20 MHz instruction cycle supports software PWM at frequencies above audible range (>20 kHz) for silent motor commutation. The watchdog timer recovers the controller from ESD-induced lockups on the factory floor, while OTP memory protects the calibration and ramp profiles from field tampering. The 20-SSOP package dissipates <2 W comfortably without external heat sinking.
Recommended
Security and Access-Control Panels
The PIC16C54CT-20E/SS can serve as a keypad scanner or RFID-tag co-processor in low-tier security panels. With 25 bytes of RAM and 33 instructions, it easily implements 4x4 matrix keypad scanning, debounce timers, and Wiegand-format output to a host controller. The internal code-protection bit prevents firmware extraction from a stolen board — important for security SKUs. The 5 V supply aligns with the regulator architecture commonly used in 12 V or 24 V security panels, eliminating the need for an additional LDO stage.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C54CT-20E/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C54C-20E/SS | PIC16C54C-20I/SS | PIC16C54A-20E/SS | PIC16C54CT-04/SS |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 20-SSOP | 20-SSOP - same | 20-SSOP - same | 20-SSOP - same | 20-SSOP - same |
| Core / Family | PIC16C54C, 8-bit RISC | PIC16C54C, 8-bit RISC | PIC16C54C, 8-bit RISC | PIC16C54A, 8-bit RISC | PIC16C54C, 8-bit RISC |
| Max Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 4 MHz |
| Program Memory | 768 B OTP (512 x 12) | 768 B OTP (512 x 12) | 768 B OTP (512 x 12) | 768 B OTP (512 x 12) | 768 B OTP (512 x 12) |
| Operating Temperature | -40 °C to +125 °C (Extended) | -40 °C to +125 °C (Extended) | -40 °C to +85 °C (Industrial) | -40 °C to +125 °C (Extended) | 0 °C to +70 °C (Commercial, inferred) |
| I/O Pins | 12 | 12 | 12 | 12 | 12 |
| Supply Voltage | 4.5 V to 5.5 V | 2.0 V to 6.0 V (wider C-rev range) | 2.0 V to 6.0 V | 2.0 V to 6.0 V | 4.5 V to 5.5 V |
| Lifecycle Status | Active | Active | Active | Active | Active |
Key Differentiators
- Extended temperature grade -40 °C to +125 °C (vs PIC16C54C-20I/SS)
- 20 MHz instruction cycle for real-time control (vs PIC16C54CT-04/SS)
- Same 20-SSOP footprint across the PIC16C5X family (vs PIC16C54CT-20E/SO)
Design Notes
Place a 100 nF X7R ceramic decoupling capacitor within 5 mm of the VDD pin (pin 20) and a 10 µF bulk electrolytic on the same node for relay or motor loads. VDD must remain within 4.5 V to 5.5 V; brown-out reset is not specified for the PIC16C54C OTP variant, so transient dips below 4.5 V may corrupt program flow without notice.
OTP (One-Time Programmable) memory cannot be erased. Validate firmware on a flash-based PIC16F54 or PIC16C54 development board first, then commit to a single PIC16C54C production programming pass. Estimated: the unit cost advantage of OTP versus flash is roughly 15-25 % per IC at 1 kpcs volumes, but a single OTP scrap batch can wipe out that saving.
Route the MCLR pull-up (typically 10 kΩ to VDD) close to pin 4 and keep the trace short to prevent ESD-induced resets. Place the crystal (or ceramic resonator) within 5 mm of pins 15-16 and guard both traces with a ground ring to avoid injecting oscillator noise into adjacent analog or relay traces.
Compliance Information
RoHS compliance and lead-free SSOP finish per Microchip product page. AEC-Q100 not explicitly listed in the data; extended -40 °C to +125 °C temperature grade is automotive-suitable but formal AEC-Q100 qualification status was not stated in the verified web data.
