PIC16C55A-04/P Microchip Integrated Circuit (Dual-In-Line Packages) In Stock
The PIC16C55A-04/P is an 8-bit PIC microcontroller from Microchip operating at up to 4 MHz with 512 x 12-word EPROM program memory and 24 I/O pins. It features the PIC16 CPU family architecture in a 28-pin PDIP through-hole package. Available from stock worldwide with competitive pricing.
- Manufacturer
- Microchip
- Package
- Dual-In-Line Packages
- Pin Count
- 28
- Lifecycle
- ACTIVE
- Datasheet
- PIC16C55A-04/P Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 512 x 12-word EPROM program memory for UV-erasable, re-programmable embedded control firmware in legacy and new designs
- 24 I/O pins on a 28-pin PDIP package provide high I/O density for parallel interface and direct peripheral control
- 4 MHz maximum clock frequency supports deterministic timing in simple real-time control and timer-based applications
- PIC16 RISC instruction architecture with single-cycle execution on most instructions simplifies firmware development for cost-sensitive controllers
Applications
The PIC16C55A-04/P is used in simple embedded control applications such as appliance controllers, keypad decoders, and LED display drivers where 8-bit processing at up to 4 MHz is sufficient and EPROM reprogrammability allows firmware updates during development. Its 24 I/O pins and 28-pin PDIP package make it well suited for prototyping and low-volume production of industrial timers, relay drivers, and motor sequencers. Legacy systems in elevator control panels, vending machines, and industrial automation that were originally designed around the PIC16C55A continue to use this part for replacement and maintenance procurement.
Specifications
| Pbfree Code | Yes |
| Manufacturer Package Code | PDIP-28 |
| Factory Lead Time | 14Weeks |
| Date Of Intro | 1990-01-01 |
| YTEOL | 3 |
| Has ADC | NO |
| Bit Size | 8 |
| Boundary Scan | NO |
| CPU Family | PIC16 |
| Clock Frequency-Max | 4MHz |
| DAC Channels | NO |
| DMA Channels | NO |
| Format | FIXED POINT |
| Integrated Cache | NO |
| JESD-30 Code | R-PDIP-T28 |
| JESD-609 Code | e3 |
| Low Power Mode | YES |
| Number of I/O Lines | 20 |
| Number of Timers | 1 |
| On Chip Data RAM Width | 8 |
| On Chip Program ROM Width | 12 |
| PWM Channels | NO |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | DIP28,.6 |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Qualification Status | Not Qualified |
| RAM (bytes) | 24 |
| RAM (words) | 24 |
| ROM (words) | 512 |
| ROM Programmability | OTPROM |
| Speed | 4MHz |
| Supply Current-Max | 3.3mA |
| Supply Voltage-Max | 5.5V |
| Supply Voltage-Min | 5V |
| Supply Voltage-Nom | 5V |
| Surface Mount | NO |
| Technology | CMOS |
| Temperature Grade | COMMERCIAL |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | DUAL |
| uPs/uCs/Peripheral ICs Type | MICROCONTROLLER, RISC |
| Package | Dual-In-Line Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| HTS Code | 8542.31.00.15 |
| Country of Origin | Thailand |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for PIC16C55A-04/P:
RISC Microcontroller, 8-Bit, OTPROM, PIC16 CPU, 4MHz, CMOS, PDIP28
RISC Microcontroller, 8-Bit, OTPROM, PIC16 CPU, 4MHz, CMOS, PDIP28
RISC Microcontroller, 8-Bit, OTPROM, PIC16 CPU, 4MHz, CMOS, PDIP28
Frequently Asked Questions
What is the maximum clock frequency and program memory size of the PIC16C55A-04/P, and how do these constrain application complexity?
The PIC16C55A-04/P runs at a maximum clock frequency of 4 MHz and contains 512 x 12-word EPROM, which provides 512 instructions of program space; this is sufficient for simple control tasks such as 8-channel relay sequencing, debounced keypad scanning, or 7-segment display multiplexing, but limits applications requiring large look-up tables or complex state machines that exceed 512 instructions.
How many I/O pins does the PIC16C55A-04/P provide and how does the 28-pin PDIP package affect board design?
The PIC16C55A-04/P provides 24 I/O pins within its 28-pin PDIP package, with a standard 2.54 mm through-hole pitch compatible with breadboards, DIP sockets, and hand-soldering; this makes it ideal for prototyping rigs and low-volume production where SMT assembly is not available, while still delivering 24 direct-drive outputs for LEDs, relays, or logic interfaces.
Why might a designer still procure the PIC16C55A-04/P for a legacy system maintenance project rather than redesigning with a newer MCU?
Legacy equipment such as industrial PLCs, elevator controllers, or vending machines designed before 1995 often used the PIC16C55A-04/P as the primary controller with firmware burned into its EPROM; replacing the device with a newer MCU would require firmware re-porting, PCB re-layout, and re-validation — costs that can far exceed procuring a replacement PIC16C55A-04/P, especially for small maintenance batches with a 14-week lead time.
Does the PIC16C55A-04/P include an on-chip ADC, and what external circuitry is required to read analog sensors?
The PIC16C55A-04/P does not include an on-chip ADC, so analog sensor readings require an external ADC such as a serial 8-bit or 10-bit converter interfaced via the I/O pins; a typical configuration pairs the PIC16C55A-04/P with a 3-wire SPI ADC like an MCP3202 (12-bit, up to 100 ksps) to handle analog inputs while the MCU manages digital control at up to 4 MHz.
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