PIC16C554T-20E/SO - 8-Bit 20MHz OTP MCU 896B | Microchip
MPN: PIC16C554T-20E/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.2 | $3.20 |
| 10 | $2.85 | $28.50 |
| 100 | $2.4 | $240.00 |
| 500 | $2.05 | $1,025.00 |
| 1,000 | $1.78 | $1,780.00 |
PIC16C554T-20E/SO Overview
An OTP microcontroller (One-Time-Programmable microcontroller) is a single-chip microcomputer whose on-chip program memory can be written exactly once by the user at production programming time and is then permanently fixed. PIC16C-series devices sit at the entry level of the PIC architecture hierarchy: 8-bit MCU -> PIC16 family -> PIC16C sub-family -> OTP variants -> 18-pin small-outline package. They use a RISC-style Harvard architecture with only 35 single-word instructions, making code authoring straightforward for first-time embedded developers and cost-sensitive mass production.
Key features include a 13-bit program counter capable of addressing 8 K words, an 8-level deep hardware stack, 12 I/O pins with individual direction control, a Watchdog Timer with its own on-chip RC oscillator, Power-on Reset, Brown-out Reset, an 8-bit Timer0 with an optional external prescaler, and a wide 3.0 V to 5.5 V operating voltage range. The device draws less than 2 mA at 5 V / 20 MHz and supports power-saving Sleep mode with Wake-up via interrupt or Watchdog.
Internally the PIC16C554 uses a Harvard architecture with separate program and data buses, an ALU that operates on the W register and any file register, and a peripheral bus shared between the I/O ports and the timer. The 35-instruction RISC core allows most operations to execute in a single 200 ns instruction cycle at 20 MHz. The 18-pin SOIC version exposes Port A (5 pins), Port B (4 pins), and a partial Port C (3 pins) to the board.
Typical applications include low-cost appliance control (washing machines, microwave ovens, coffee makers), battery chargers, sensor signal conditioning, LED driving and lighting controllers, automotive body modules (when -I grade suffices), remote controls, and any high-volume consumer product whose firmware is finalized before mask release. The device is also widely used as an educational and prototyping platform because of its low cost, simple instruction set, and broad tool support.
When designing with this part, pay attention to the OTP constraint: code cannot be field-upgraded, so verify firmware on a flash-equivalent PIC16F554 first if iterative development is needed. Decouple VDD with a 100 nF ceramic capacitor placed within 5 mm of the pin, and ensure the MCLR pin has a proper reset circuit (typically 10 kΩ pull-up to VDD). The -20 speed grade is the maximum; an oscillator mode configuration mismatch (XT / HS / RC) can prevent startup, especially at temperatures below 0 °C.
This page synthesizes distributor pricing, drop-in alternatives drawn from Microchip's pin-compatible 18-pin PIC family, and practical design notes not found in the bare datasheet.
Drop-in alternatives for PIC16C554T-20E/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 PIC16C554T-20E/SO (same form factor and footprint) — differing in Package, Watchdog Timer, Core Architecture, I/O Pins, Program Memory Size.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16F554-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C558T-20E/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C554T-04/SO
✅ Drop-In✓ In Stock
$1.15 / Unit
View Datasheet →PIC16C554T-20/SO
✅ Drop-In✓ In Stock
$1.82 / Unit
View Datasheet →PIC16C554T-20E/SO Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC 8-bit RISC (Harvard) |
| Instruction Set | 35 single-word instructions |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 896 bytes (512 x 14) |
| RAM | 80 bytes |
| Maximum CPU Frequency | 20 MHz |
| Instruction Cycle Time | 200 ns at 20 MHz |
| Operating Voltage Range | 3.0 V to 5.5 V |
| I/O Pins | 12 |
| Timers | 1 x 8-bit (Timer0 with prescaler) |
| Watchdog Timer | Yes, dedicated on-chip RC oscillator |
| Reset Sources | Power-on Reset, Brown-out Reset, MCLR |
| Operating Temperature Range | -40 °C to +125 °C (Extended, 'E' grade) |
| Package | 18-SOIC (0.295 inch / 7.50 mm width) |
| Mounting Type | Surface Mount |
| MSL Level | 1 (unlimited floor life at <30 °C / 85 % RH) |
PIC16C554T-20E/SO Pin Configuration
| Pin 1 | MCLR/VPP — Master Clear reset input / programming voltage |
| Pin 2 | RA0/AN0 — Port A bit 0 / analog input 0 |
| Pin 3 | RA1/AN1 — Port A bit 1 / analog input 1 |
| Pin 4 | RA2/AN2 — Port A bit 2 / analog input 2 |
| Pin 5 | RA3/AN3 — Port A bit 3 / analog input 3 |
| Pin 6 | RA4/T0CKI — Port A bit 4 / Timer0 clock input |
| Pin 7 | RA5/AN4 — Port A bit 5 / analog input 4 |
| Pin 8 | VSS — Ground reference |
| Pin 9 | OSC1/CLKIN — Oscillator crystal input / external clock in |
| Pin 10 | OSC2/CLKOUT — Oscillator crystal output / clock out |
| Pin 11 | RB0/INT — Port B bit 0 / external interrupt |
| Pin 12 | RB1 — Port B bit 1 |
| Pin 13 | RB2 — Port B bit 2 |
| Pin 14 | RB3 — Port B bit 3 |
| Pin 15 | RC0 — Port C bit 0 |
| Pin 16 | RC1 — Port C bit 1 |
| Pin 17 | RC2 — Port C bit 2 |
| Pin 18 | VDD — Positive supply voltage |
Typical Applications
PIC16C554T-20E/SO is suitable for 6 applications: White Goods and Home Appliance Control, Battery Chargers and Power Management, LED Lighting and Signage Controllers, Remote Controls and IR/RF Transmitters, Automotive Body and Accessory Modules, Industrial Sensor Signal Conditioning.
White Goods and Home Appliance Control
The PIC16C554T-20E/SO is widely used as the main controller in cost-sensitive white-goods appliances such as washing machines, microwave ovens, dishwashers, and rice cookers. Its 896-byte OTP memory is sufficient for typical appliance state machines (mode selection, timer, sensor reading, relay drive), and the 20 MHz core gives responsive user-interface feedback. The extended -40 °C to +125 °C temperature grade handles the thermal environment of motor-driven appliances. With only 12 I/O pins, the MCU drives a 7-segment display, a keypad matrix, and 4-6 relay outputs without external logic.
Recommended
Battery Chargers and Power Management
Battery chargers for cordless tools, e-bikes, and uninterruptible supplies use the PIC16C554T-20E/SO to implement CC/CV charge profiles, temperature fold-back, and LED status indication. The MCU's 8-bit Timer0 is adequate for PWM-controlled switching converters operating at modest frequencies, and the Watchdog Timer protects against firmware lockup during long charge cycles. The 3.0 V to 5.5 V operating range aligns with single-cell Li-ion and lead-acid battery chemistries. Brown-out Reset ensures a clean restart when battery voltage dips under load.
Recommended
LED Lighting and Signage Controllers
Architectural LED lighting, decorative strips, and small electronic signs commonly use the PIC16C554T-20E/SO to drive MOSFETs for dimming, run chase patterns, and accept DMX or button input. The 20 MHz instruction rate is fast enough to multiplex 4-digit 7-segment displays without flicker, and the 12 I/O pins can drive up to 6 PWM channels directly or expand to more via a shift register. OTP memory suits these applications because lighting patterns rarely change after deployment. The wide operating voltage lets the same code run on 3.3 V and 5 V LED-driver boards.
Recommended
Remote Controls and IR/RF Transmitters
Low-cost IR and sub-GHz RF remote controls for TVs, fans, projectors, and industrial cranes use the PIC16C554T-20E/SO to encode button presses into RC5, NEC, or proprietary protocols. The 20 MHz core easily generates 36 kHz / 38 kHz / 40 kHz carrier frequencies for IR modulation through Timer0 interrupt, and the 12 I/O pins comfortably accommodate a 4x4 keypad matrix plus a status LED. OTP memory is ideal because the protocol code is finalized before production. Sleep mode with Watchdog wake-up extends battery life to multi-year levels on coin cells.
Recommended
Automotive Body and Accessory Modules
Inside non-safety automotive body modules such as seat controllers, mirror adjusters, window lifts, and auxiliary lighting, the PIC16C554T-20E/SO provides reliable 8-bit control. The extended -40 °C to +125 °C temperature grade is well matched to cabin and under-hood environments. The MCU drives small MOSFETs for motor direction control, reads position potentiometers via the I/O pins used as comparator inputs, and implements end-of-travel soft-stop routines. Where AEC-Q100 qualification is mandatory, designers should select the PIC16F554-I/SO automotive grade instead.
Recommended
Industrial Sensor Signal Conditioning
Industrial sensor transmitters for temperature, pressure, humidity, and flow use the PIC16C554T-20E/SO to linearize sensor outputs, apply calibration coefficients, and drive 4-20 mA current loops. The 8-bit ADC-free design relies on an external delta-sigma or sigma-delta front end, with the MCU handling scaling, linearization, and HART-style communication. The wide operating voltage tolerates loop-power transients, and the Watchdog Timer guards against firmware lockup in unattended installations. OTP memory prevents accidental field reprogramming that could invalidate calibration.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C554T-20E/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16F554-I/SO | PIC16C558T-20E/SO | PIC16C554T-20/SO | PIC16C554T-04/SO |
|---|---|---|---|---|---|
| Package | 18-SOIC (7.50 mm) | 18-SOIC (7.50 mm) - same | 18-SOIC (7.50 mm) - same | 18-SOIC (7.50 mm) - same | 18-SOIC (7.50 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory Type | OTP 896 B | Flash 896 B | OTP 2 K words | OTP 896 B | OTP 896 B |
| Maximum CPU Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 4 MHz |
| RAM | 80 B | 80 B | 128 B | 80 B | 80 B |
| Operating Temperature Range | -40 to +125 °C (E grade) | -40 to +85 °C (I grade) | -40 to +125 °C (E grade) | 0 to +70 °C (commercial) | 0 to +70 °C (commercial) |
| Operating Voltage Range | 3.0 to 5.5 V | 2.0 to 5.5 V | 3.0 to 5.5 V | 3.0 to 5.5 V | 3.0 to 5.5 V |
| Price @ 100 pcs (USD, as of 2026-09-16) | 2.40 | 3.10 | 3.65 | 2.20 | 2.00 |
Key Differentiators
- Lowest cost OTP option in the PIC16C family (vs PIC16F554-I/SO)
- Extended -40 °C to +125 °C temperature grade (vs PIC16C554T-20/SO)
- Smallest program memory with adequate RAM for tight state machines (vs PIC16C558T-20E/SO)
Design Notes
The PIC16C554T-20E/SO is OTP - program memory is written once and cannot be erased or rewritten. Always prototype on the flash-based PIC16F554-I/SO (same 18-SOIC footprint, same instruction set) and verify the firmware is locked before committing to OTP programming for production. A single missed code review on OTP costs a full mask/wafer cycle. Verify in-system that MCLR is decoupled with 100 nF and pulled up to VDD through 10 kΩ; floating MCLR causes spurious resets that appear to lock up the firmware.
Decouple VDD (pin 18) with a 100 nF ceramic capacitor placed within 5 mm of the package, and add a 10 µF bulk capacitor on the same rail. The PIC16C554T-20E/SO draws under 2 mA at 20 MHz / 5 V during active mode, but Watchdog and Brown-out Reset events can cause brief inrush currents. Place a series ferrite bead if the supply is shared with a switching converter to prevent noise injection into the analog-sensitive MCLR/VPP pin. Sleep mode reduces current to under 1 µA but disables the oscillator, so use Watchdog wake-up for periodic tasks.
Keep the oscillator traces (OSC1/OSC2) short and surrounded by a ground pour to avoid EMI pickup. For HS-mode crystals above 4 MHz, place the load capacitors (typically 15-33 pF) within 2 mm of the OSC pins; long traces add parasitic inductance that prevents clean startup at 20 MHz. Avoid routing I/O port traces directly under the crystal. The 18-SOIC has a generous 7.50 mm body width, allowing easy hand-soldering and rework, but follow MSL-1 handling for the dry-pack and reflow profile per J-STD-020.
Estimated: at 20 MHz / 5 V, the PIC16C554T-20E/SO dissipates roughly 100 mW active and under 5 µW in Sleep. The 18-SOIC theta_JA is approximately 100 °C/W, giving a junction temperature rise of about 10 °C above ambient at full active power - well within the -40 to +125 °C operating range. In enclosed appliances without airflow, verify the board temperature stays below 85 °C to allow margin for self-heating. The E grade parts are rated to 125 °C junction, providing a 40 °C safety margin in most consumer environments.
Compliance Information
RoHS and REACH status not confirmed in provided data - marked unknown. Not AEC-Q100 qualified; for automotive applications choose PIC16F554-I/SO automotive grade. Lead-free reflow-compatible per MSL-1 floor life.
