PIC16C55-LPE/SP - 8-Bit 40MHz OTP MCU 768B | Microchip
MPN: PIC16C55-LPE/SP ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.95 | $8.95 |
| 10 | $8.06 | $80.60 |
| 100 | $7.2 | $720.00 |
| 500 | $6.5 | $3,250.00 |
| 1,000 | $5.95 | $5,950.00 |
PIC16C55-LPE/SP Overview
The PIC16C5x family occupies a distinct place in microcontroller taxonomy: it is the original baseline PIC architecture, sitting beneath mid-range (PIC16F1xxx) and enhanced mid-range (PIC16F1xx) families in the broader 8-bit microcontroller hierarchy, which itself falls under microcontroller -> embedded processing -> semiconductor. Baseline PIC devices use a fixed 12-bit instruction word, separate program and data buses (Harvard), and a register-based accumulator architecture, which together deliver compact code density and predictable interrupt response.
Key features of the PIC16C55-LPE/SP include a 33-instruction set, two 8-bit timer/counters (TMR0 and TMR1 in the watchdog role), a watchdog timer with on-chip RC oscillator, programmable code protection, and a wide 3.0V to 6.0V operating voltage range compatible with both 3.3V and 5V system rails. The LP oscillator option supports low-power crystal operation, making the part appropriate for energy-conscious designs. The device offers 20 I/O pins with high-current sink capability directly driving LEDs and small relays.
Typical applications include simple embedded control loops, sensor signal conditioning front-ends, consumer appliance controllers, and educational/development platforms. Its low cost, deterministic execution, and OTP memory make it well suited to high-volume, fixed-function products where firmware changes are not anticipated after programming. The PIC16C55-LPE/SP also serves as a teaching vehicle for engineers learning PIC assembly language fundamentals.
When designing with the PIC16C55-LPE/SP, engineers should note that OTP memory cannot be reprogrammed in-circuit; once programmed, firmware changes require a new device. The PIC16C55 is an older, mature part with limited availability from authorized distributors. The device requires an external reset circuit and does not include on-chip debug; development typically relies on the MPLAB PM3 programmer and MPLAB IDE for code generation. This page synthesizes distributor pricing, package details, and drop-in pin-compatible alternatives to assist engineers sourcing this legacy MCU.
Drop-in alternatives for PIC16C55-LPE/SP — 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 PIC16C55-LPE/SP (same form factor and footprint) — differing in Package, I/O Pins, Timers, Core Architecture, Maximum Clock Frequency.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C55-HSI/SP
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
PIC16C55-10/SP
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$2.45 / Unit
View Datasheet →PIC16C55/JW
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$10.4 / Unit
View Datasheet →PIC16F57-I/SP
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C54C-04/P
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$1.71 / Unit
View Datasheet →PIC16C55-LPE/SP Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit PIC baseline (Harvard) |
| Program Memory Type | OTP (One-Time Programmable EPROM) |
| Program Memory Size | 768 B (512 x 12 bits) |
| RAM Size | 24 B |
| Maximum CPU Frequency | 40 MHz |
| Instruction Set | 33 instructions, 12-bit wide |
| I/O Pins | 20 |
| Timers | 1 x 8-bit (TMR0) |
| Watchdog Timer | Yes (with on-chip RC oscillator) |
| Oscillator Mode | LP (low-power crystal, 32 kHz to 200 kHz typical; device rated up to 40 MHz external clock) |
| Operating Voltage Range | 3.0 V to 6.0 V |
| Operating Temperature Range | -40 C to +85 C (industrial) |
| Package | 28-pin SPDIP (Skinny PDIP) |
| Mounting Type | Through-Hole |
| Code Protection | Programmable |
| RoHS Status | Compliant |
| Lead-Free | Yes |
| Data EEPROM | Not present |
| ADC | Not present |
PIC16C55-LPE/SP Pin Configuration
| Pin 1 | RA0 — Port A bit 0 (digital I/O) |
| Pin 2 | RA1 — Port A bit 1 (digital I/O) |
| Pin 3 | RA2 — Port A bit 2 (digital I/O) |
| Pin 4 | RA3 — Port A bit 3 (digital I/O) |
| Pin 5 | RA4/T0CKI — Port A bit 4 / Timer0 clock input |
| Pin 6 | RTCC — Real-Time Clock/Control output (RA4 pull-up enable) |
| Pin 7 | VSS — Ground |
| Pin 8 | OSC1 — Oscillator input |
| Pin 9 | OSC2 — Oscillator output |
| Pin 10 | VDD — Positive supply voltage |
| Pin 11 | RB0 — Port B bit 0 (digital I/O) |
| Pin 12 | RB1 — Port B bit 1 (digital I/O) |
| Pin 13 | RB2 — Port B bit 2 (digital I/O) |
| Pin 14 | RB3 — Port B bit 3 (digital I/O) |
| Pin 15 | RB4 — Port B bit 4 (digital I/O) |
| Pin 16 | RB5 — Port B bit 5 (digital I/O) |
| Pin 17 | RB6 — Port B bit 6 (digital I/O) |
| Pin 18 | RB7 — Port B bit 7 (digital I/O) |
| Pin 19 | RC0 — Port C bit 0 (digital I/O) |
| Pin 20 | RC1 — Port C bit 1 (digital I/O) |
| Pin 21 | RC2 — Port C bit 2 (digital I/O) |
| Pin 22 | RC3 — Port C bit 3 (digital I/O) |
| Pin 23 | RC4 — Port C bit 4 (digital I/O) |
| Pin 24 | RC5 — Port C bit 5 (digital I/O) |
| Pin 25 | RC6 — Port C bit 6 (digital I/O) |
| Pin 26 | RC7 — Port C bit 7 (digital I/O) |
| Pin 27 | NC — Not connected (per datasheet package) |
| Pin 28 | MCLR/VPP — Master Clear reset / programming voltage input |
Typical Applications
PIC16C55-LPE/SP is suitable for 6 applications: Industrial Control Logic Replacement, Consumer Appliance Controllers, Sensor Signal Conditioning Front-End, Educational Microcontroller Platform, Automotive Aftermarket Modules, Hobbyist and Maker Prototyping.
Industrial Control Logic Replacement
Replacement of legacy discrete logic in factory automation retrofits. The PIC16C55-LPE/SP's 768 B OTP and 33 fixed instructions provide just enough code density to implement state machines for conveyor control, solenoid sequencing, and pump interlocks, while 20 mA I/O sink capability directly drives relays without buffer transistors. At 3.0 V to 6.0 V operation, the part interfaces directly to 5 V industrial logic and 24 V systems via optocouplers. The RISC architecture executes most instructions in a single 100 ns cycle, ensuring deterministic response to sensor inputs that is critical in safety interlocks where unpredictable latency could create a hazardous condition. Drop-in availability in 28-pin SPDIP simplifies PCB replacement of older 8051 or Z8-based legacy boards.
Recommended
Consumer Appliance Controllers
Fixed-function controllers for white goods such as toasters, coffee makers, and small kitchen appliances. The PIC16C55-LPE/SP's OTP memory locks in production firmware preventing unauthorized field modifications, while the 24-byte RAM and 20 I/O pins handle button scanning, LED multiplexing, and triac/SCR firing control. The 33-instruction baseline PIC core compiles to extremely tight assembly that fits in 768 B even for multi-mode timing logic. The LP low-power oscillator option enables battery-backed timer functions in products like alarm clocks and programmable coffee makers. Cost under USD 6 at qty 1000 supports thin-margin consumer price points, and the wide 3.0 V to 6.0 V supply range accepts unregulated rectified mains through a simple zener regulator.
Recommended
Sensor Signal Conditioning Front-End
Analog sensor preprocessing stage that converts resistive or pulse-output sensors to clean logic signals. The PIC16C55-LPE/SP's TMR0 counter captures pulse trains from flow meters and optical encoders, while software-implemented filters debounce mechanical switches and average noisy thermocouple signals. The high-current I/O pins drive 4 to 20 mA current loops and indicator LEDs directly, eliminating external drivers. With 768 B OTP the firmware implements PID loops for thermal regulation and proportional valve control in HVAC damper actuators. The 100 ns instruction cycle enables 10 kHz sampling rates adequate for vibration monitoring on rotating equipment. Through-hole SPDIP packaging is preferred for hand-soldered service-replacement boards in field-installed industrial instrumentation.
Recommended
Educational Microcontroller Platform
Teaching vehicle for embedded systems and assembly-language courses. The PIC16C55-LPE/SP's small 33-instruction RISC set is small enough for students to master in a single semester, while its 768 B program memory forces careful code optimization, reinforcing resource-constraint thinking absent in modern 32-bit environments. The 28-pin SPDIP package fits standard 0.1 inch breadboards and is robust against repeated insertion cycles. Microchip's MPLAB IDE and PM3 programmer provide a free, well-documented development environment used in university curricula worldwide. The OTP memory limitation is itself a useful teaching point about one-time-programmable device economics versus flash. The deterministic single-cycle instruction timing enables clear demonstration of interrupt latency, watchdog behavior, and oscillator configuration in undergraduate labs.
Recommended
Automotive Aftermarket Modules
Non-safety automotive accessories such as interior lighting controllers, alarm system annunciators, and aftermarket gauge drivers. The PIC16C55-LPE/SP's industrial -40 C to +85 C temperature grade handles under-dash thermal environments, while its 5 V operation matches vehicle electrical systems through simple regulators. The 20 mA I/O capability drives automotive relays and small solenoids directly without driver ICs. OTP memory prevents end-user firmware tampering in security-sensitive accessories. The wide 3.0 V to 6.0 V supply tolerance tolerates load-dump transients and cranking-voltage dips common in 12 V automotive systems. With 768 B OTP, designers implement RPM processing for shift lights, temperature-based fan control, and PWM lighting effects. The legacy part is widely available in the automotive aftermarket distribution channel.
Recommended
Hobbyist and Maker Prototyping
Through-hole microcontroller for hobbyist electronics projects where the PIC16C55-LPE/SP's breadboard-friendly SPDIP package and well-documented assembly language simplify prototyping. The 20 digital I/O pins drive LED matrices, character LCDs, and stepper motors for robotics and animatronics builds. The 768 B OTP limits project size but encourages disciplined modular coding practices. The legacy part's mature toolchain supports both assembly and CCS C compiler, accommodating makers with different backgrounds. Low unit cost below USD 10 makes it affordable for workshops and classroom kits. PIC enthusiasts appreciate the baseline architecture's educational value as a foundation before advancing to mid-range PIC16F1xxx and PIC18F parts.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C55-LPE/SP — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C55-HSI/SP | PIC16C55-10/SP | PIC16F57-I/SP |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-pin SPDIP | 28-pin SPDIP - same | 28-pin SPDIP - same | 28-pin SPDIP - same |
| Program Memory | 768 B OTP | 768 B OTP | 768 B OTP | 3 KB Flash |
| RAM Size | 24 B | 24 B | 24 B | 72 B |
| Max Frequency | 40 MHz | 40 MHz | 10 MHz | 20 MHz |
| Memory Type | OTP (one-time) | OTP (one-time) | OTP (one-time) | Flash (reprogrammable) |
| Oscillator Mode | LP (low-power) | HS (high-speed) | Standard | HS / XT / LP |
| Operating Voltage | 3.0 V to 6.0 V | 3.0 V to 6.0 V | 3.0 V to 6.0 V | 2.0 V to 5.5 V |
| Lifecycle Status | NRND | NRND | NRND | Active |
Key Differentiators
- Low-power LP oscillator mode at competitive cost (vs PIC16C55-HSI/SP)
- Flash-based reprogrammability eliminates OTP field-update risk (vs PIC16F57-I/SP)
- Wider industrial temperature range and wider voltage tolerance vs mid-range PIC16F parts (vs PIC16F887-I/P)
Design Notes
Do not attempt in-circuit reprogramming of PIC16C55-LPE/SP: the OTP memory is by definition one-time programmable. Emulation must be performed using a windowed ceramic PIC16C55/JW part before committing to OTP volume parts, otherwise firmware bugs discovered after programming will require scrapping every programmed device. Establish an ICE (in-circuit emulator) cycle with the windowed part during development and freeze the firmware before ordering OTP units.
Place the decoupling capacitor (typically 0.1 uF ceramic in parallel with 10 uF tantalum or electrolytic) within 5 mm of the VDD pin (pin 10). Keep the OSC1/OSC2 traces short and surround them with a ground pour to minimize EMI. The MCLR/VPP pin (pin 28) requires a 10 kohm pull-up to VDD; if not used for programming, route the trace directly to VDD or through the pull-up. Pin 27 is NC and may be left floating or tied to ground.
The PIC16C55-LPE/SP's LP low-power oscillator mode supports 32 kHz to 200 kHz crystals for energy-sensitive designs, with current consumption dropping to roughly 20 uA at 32 kHz and 3 V. For higher frequencies the part should be re-specified as PIC16C55-HS/SP (HS mode, 4-20 MHz) or PIC16C55-XT/SP (XT mode, up to 4 MHz). Brown-out detection is not internal to the PIC16C55 - implement external brown-out or ensure VDD rise/fall times are within datasheet limits to prevent code-execution errors during power transitions.
Compliance Information
RoHS and lead-free per Microchip product page. NRND status noted. AEC-Q100 not applicable - choose AEC-Q100-qualified PIC16 family members for automotive safety applications. Halogen-free status not stated on Microchip product page.
