PIC16C554T-20I/SS - 8-Bit OTP MCU, 20MHz, 20-SSOP | Microchip
MPN: PIC16C554T-20I/SS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.15 | $2.15 |
| 10 | $1.93 | $19.30 |
| 100 | $1.72 | $172.00 |
| 500 | $1.52 | $760.00 |
| 1,000 | $1.35 | $1,350.00 |
PIC16C554T-20I/SS Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, memory, and peripherals on one die. The PIC architecture pioneered the Harvard RISC design for embedded controllers, executing one instruction per clock cycle (except branches) and offering deterministic interrupt response. Within the system hierarchy, a PIC16C-series MCU belongs to the broader category of microcontroller -> embedded processor -> integrated circuit -> semiconductor. The 16C family specifically uses OTP EPROM rather than flash, making it suited for high-volume mature programs where code stability and low unit cost outweigh in-field reprogrammability.
Key features include 35 single-word instructions, a 14-bit instruction word, two 8-bit timer/counters (Timer0 and Timer2), a Watchdog Timer (WDT) with on-chip RC oscillator, Power-On Reset (POR), and a programmable code-protection mechanism. The device consumes very low operating current, supporting battery-powered and energy-conscious designs. Its SSOP-20 footprint (5.30 mm body width) is widely accepted for industrial embedded boards.
Architecturally, the PIC16C554 uses a RISC engine with separate program and data buses, eliminating Von Neumann fetch bottlenecks. The OTP cell array is programmed via standard Microchip device programmers (e.g., MPLAB PM3). Code protection bits and ID locations are supported. This 8-bit core is fully supported by MPLAB X IDE and the XC8 C compiler, with a mature library ecosystem covering timers, ADC emulation via RC, and bit-banged peripherals.
Typical applications include industrial control logic, sensor interface modules, low-cost consumer appliances, white-goods user-interface boards, automotive body electronics sub-modules, and battery-operated instrumentation. Designers choose this OTP part for stable production firmware where field re-programming is unnecessary, reducing per-unit cost versus equivalent flash devices.
Design consideration: Because the PIC16C554T-20I/SS is OTP (not flash), the firmware must be fully validated on a windowed or flash-equivalent PIC16F554 prototype before committing to OTP volume production. Also plan for in-circuit programming (ICSP) test points since OTP parts cannot be re-programmed during PCB debug.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes that complement the manufacturer datasheet with cross-references, parametric comparisons, and engineered replacement guidance.
Drop-in alternatives for PIC16C554T-20I/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 PIC16C554T-20I/SS (same form factor and footprint) — differing in Package, Program Memory Size, Program Memory Type, Operating Temperature Range, Packaging.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C554-20I/SS
✅ Drop-In✓ In Stock
$1.82 / Unit
View Datasheet →PIC16C554T-04I/SS
✅ Drop-In✓ In Stock
$1.09 / Unit
View Datasheet →PIC16C554T-04E/SS
✅ Drop-In✓ In Stock
$2.85 / Unit
View Datasheet →PIC16C554T-20I/SO
✅ Drop-In✓ In Stock
$1.82 / Unit
View Datasheet →PIC16C554T-20/SS
✅ Drop-In✓ In Stock
$1.74 / Unit
View Datasheet →PIC16F54-I/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C554T-20I/SS Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC 8-bit RISC (Harvard) |
| Family | PIC16C Series (PIC16C554) |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 896 bytes (512 x 14 words) |
| Data RAM | 80 bytes |
| Maximum CPU Frequency | 20 MHz |
| Instruction Cycle Time | 200 ns |
| Operating Voltage (Vdd) | 3.0 V to 5.5 V |
| I/O Pins | 13 |
| Timers | Timer0 (8-bit), Timer2 (8-bit) |
| Watchdog Timer (WDT) | Yes, on-chip RC oscillator |
| Power-On Reset (POR) | Yes |
| Operating Temperature Range | -40 C to +85 C (Industrial) |
| Package | 20-SSOP (5.30 mm body width) |
| Mounting Type | Surface Mount |
| Packaging | Tape & Reel (T suffix) |
PIC16C554T-20I/SS Pin Configuration
| Pin 1 | MCLR/VPP — Master Clear (reset) input / Programming voltage input |
| Pin 2 | RA0/AN0 — PORTA bit 0 / Analog input 0 |
| Pin 3 | RA1/AN1 — PORTA bit 1 / Analog input 1 |
| Pin 4 | RA2/AN2 — PORTA bit 2 / Analog input 2 |
| Pin 5 | RA3/AN3 — PORTA bit 3 / Analog input 3 |
| Pin 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Pin 7 | RA5 — PORTA bit 5 |
| Pin 8 | VSS — Ground reference |
| Pin 9 | OSC1/CLKIN — Oscillator crystal input / External clock input |
| Pin 10 | OSC2/CLKOUT — Oscillator crystal output / Clock output (Fosc/4) |
| Pin 11 | RC0 — PORTC bit 0 |
| Pin 12 | RC1 — PORTC bit 1 |
| Pin 13 | RC2 — PORTC bit 2 |
| Pin 14 | RC3 — PORTC bit 3 |
| Pin 15 | RC4 — PORTC bit 4 |
| Pin 16 | RC5 — PORTC bit 5 |
| Pin 17 | RC6 — PORTC bit 6 |
| Pin 18 | RC7 — PORTC bit 7 |
| Pin 19 | VDD — Positive supply voltage (3.0 V to 5.5 V) |
| Pin 20 | RB0/INT — PORTB bit 0 / External interrupt input |
Typical Applications
PIC16C554T-20I/SS is suitable for 6 applications: Industrial Sensor Interface Module, White-Goods User Interface Controller, Automotive Body Electronics Sub-Module, Low-Cost Consumer Remote Control, Battery-Operated Instrumentation, Industrial Control Logic Replacement.
Industrial Sensor Interface Module
The PIC16C554T-20I/SS fits industrial sensor-interface modules because it combines 13 GPIO with 20 MHz throughput and an industrial -40C to +85C operating range. The 896-byte OTP program memory stores fixed conversion tables and linearization coefficients, while the 80-byte RAM handles cyclical scanning buffers. The on-chip Watchdog Timer with dedicated RC oscillator guards against field lockups in noisy factory environments, and Power-On Reset guarantees deterministic startup. At VIN=5V the MCU consumes only a few mA active, suiting 4-20 mA loop-powered transmitters. Unlike 32-bit Cortex parts, the PIC16C554T-20I/SS delivers deterministic interrupt response and low-cost OTP for high-volume sensor deployments.
Recommended
White-Goods User Interface Controller
In white-goods appliances (washing machines, dishwashers, microwave ovens), the PIC16C554T-20I/SS drives button-scan matrices and LED/buzzer indicators using its 13 GPIO. The 200 ns instruction cycle easily handles multiplexed 7-segment displays and rotary-encoder decoding. Because white-goods firmware is typically locked at production, the OTP architecture avoids field-reprogramming liability while lowering the BOM cost. The PIC16C554T-20I/SS paired with an external triac-driver IC can directly switch mains-referenced loads, and its 20 MHz throughput supports UART communication with the main appliance controller. Compared with 8-bit AVR, the PIC RISC architecture offers a simpler 35-instruction set for tight assembly-code optimization.
Recommended
Automotive Body Electronics Sub-Module
The PIC16C554T-20I/SS appears in automotive body-electronics sub-modules such as seat controllers, mirror adjusters, and lighting-timer modules where moderate logic density is needed. The 13 GPIO handles H-bridge direction logic, switch debouncing, and PWM dimming, while the Watchdog Timer guards against load-dump-induced resets. The 20 MHz throughput supports CAN-compatible bit-banging via timer interrupts at 125 kbps. Note that AEC-Q100 grade is NOT specified for the PIC16C554T-20I/SS - for under-hood automotive use, designers should select PIC16F-series AEC-Q100 qualified parts instead. Within cabin-only body-electronics the PIC16C554T-20I/SS is widely used in mature production programs.
Recommended
Low-Cost Consumer Remote Control
For IR remote controls and simple battery-powered consumer peripherals, the PIC16C554T-20I/SS provides just enough GPIO and CPU performance for button matrix scanning and IR carrier generation. At 20 MHz the device generates 38 kHz/40 kHz IR carriers with precise timing using Timer0. The PIC's low power-down current extends battery life to multi-year levels on a coin cell. The 896-byte OTP accommodates complete RC5/RC6/SIRC protocol stacks with custom device codes. Compared to ASIC encoders, the PIC16C554T-20I/SS offers programmable flexibility for multiple protocol variants at near-ASIC cost in high volumes.
Recommended
Battery-Operated Instrumentation
Battery-powered instruments such as portable measurement probes and handheld barcode scanners benefit from the PIC16C554T-20I/SS's low active current and 3.0 V minimum Vdd. Operating from two AA cells (3.0 V) up to a USB-derived 5 V rail, the device's 3.0-5.5 V input range covers the full battery discharge curve. The Watchdog Timer with on-chip RC oscillator prevents battery sag-induced lockups. The 80-byte RAM is sufficient for sensor sample averaging, and the 20 MHz throughput handles UART output of measurement results. OTP programming locks firmware against accidental overwrites in the field. Compared to higher-end Cortex-M0+ parts, the PIC16C554T-20I/SS saves cost and reduces sleep current.
Recommended
Industrial Control Logic Replacement
The PIC16C554T-20I/SS serves as a form-fit-function replacement for legacy 8-bit logic ICs in industrial control boards, replacing discrete 74HC-series glue logic with a programmable equivalent. The 13 GPIO can be software-assigned as inputs, outputs, or peripheral functions, allowing one PIC to replace dozens of discrete gates. The 200 ns instruction cycle emulates combinatorial logic with deterministic latency, while the 896-byte OTP stores lookup tables for state-machine control sequences. Industrial -40C to +85C operation tolerates factory-floor temperatures, and the Watchdog Timer adds a safety layer absent in pure discrete-logic designs. This migration often reduces board area, BOM count, and long-term component-obsolescence risk.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C554T-20I/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C554-20I/SS | PIC16C554T-04I/SS | PIC16C554T-04E/SS | PIC16C554T-20I/SO | PIC16F54-I/SS |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 20-SSOP | 20-SSOP (same) | 20-SSOP (same) | 20-SSOP (same) | 20-SOIC (different footprint) | 20-SSOP (same) |
| Maximum CPU Frequency | 20 MHz | 20 MHz | 4 MHz | 4 MHz | 20 MHz | 20 MHz |
| Program Memory Type | OTP EPROM (896 B) | OTP EPROM (896 B) | OTP EPROM (896 B) | OTP EPROM (896 B) | OTP EPROM (896 B) | Flash (896 B) |
| Data RAM | 80 bytes | 80 bytes | 80 bytes | 80 bytes | 80 bytes | 25 bytes |
| I/O Pins | 13 | 13 | 13 | 13 | 13 | 12 |
| Operating Voltage | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 2.0 V to 5.5 V |
| Temperature Range | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) | -40 C to +125 C (Extended) | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) |
| Watchdog Timer | Yes (on-chip RC) | Yes | Yes | Yes | Yes | Yes |
Key Differentiators
- Lower per-die cost at high volumes than flash equivalents (vs PIC16F54-I/SS)
- Higher maximum clock speed than 4 MHz graded variants (vs PIC16C554T-04I/SS)
- Industrial -40C to +85C operating range (vs PIC16C554T-20/SS)
- Tape-and-reel packaging for SMT production lines (vs PIC16C554-20I/SS)
Design Notes
PIC16C554T-20I/SS uses OTP EPROM which CANNOT be re-programmed in the field. Always validate firmware on a flash-equivalent prototype (PIC16F54-I/SS in the same 20-SSOP package) or a windowed PIC16C554 before committing to OTP volume production. OTP parts returned with bad firmware are scrap; there is no recovery path. Plan ICSP test points on the PCB for initial prototype bring-up so that firmware can be iterated on PIC16F-series equivalents before OTP mask ordering.
Place a 100 nF decoupling capacitor as close as possible to the VDD pin (pin 19) and a bulk capacitor (4.7-10 uF) at the supply rail. The MCLR/VPP pin (pin 1) requires a 10 kohm pull-up to VDD for normal operation; for in-circuit serial programming (ICSP), connect MCLR to the programmer via a diode-isolated network so that the rest of the circuit does not load the programming voltage. Keep the OSC1/OSC2 traces short and surrounded by ground pour to minimize EMI susceptibility.
Estimated: At 5V VDD, 20 MHz active, the PIC16C554T-20I/SS typically draws ~5-7 mA active and ~1 uA sleep. Power dissipation in the SSOP-20 package (theta_JA ~100 C/W) yields negligible self-heating (~3.5 mW active). No heatsink or thermal management is required under normal industrial conditions. For sealed enclosures above +60C ambient, verify that sleep-mode duty cycle keeps average junction temperature below +125C.
The PIC16C554T-20I/SS supports a wide 3.0-5.5 V supply range, enabling operation directly from two AA cells (3.0 V nominal) or a USB-derived 5 V rail. Brown-Out Reset (BOR) is configurable via configuration bits; if disabled, software must validate VDD before critical writes. For battery applications, use the SLEEP instruction and Watchdog Timer wake-up to achieve <1 uA average current. Add a power-rail supervisor (e.g., MCP120) for applications where VDD may droop below the 3.0 V minimum during motor starts.
Route the ICSP clock (PGC) and data (PGD) lines away from high-frequency switching nodes to avoid programming failures during in-circuit programming. Reserve a 6-pin header (or test-pad cluster) for the Microchip MPLAB programmer. Keep analog inputs (RA0-RA3) away from digital switching traces; if used as digital I/O, disable the analog function via the CMCON register. The 5.30 mm body width of SSOP-20 demands fine-pitch PCB land patterns - use 0.65 mm pitch and ensure the solder mask sliver between pads meets IPC-SM-782 standards.
Compliance Information
PIC16C OTP family parts from Microchip are typically non-RoHS due to the OTP EPROM process and older product status; verify the specific date code and lot with the manufacturer for RoHS/lead-free compliance. AEC-Q100 is NOT qualified - select a PIC16F-series automotive part for under-hood applications. Conflict-minerals compliance follows Microchip's published CMRT declarations.