PIC16C558-04I/SO - 8-bit OTP MCU, 4MHz, 3.5KB | Microchip
MPN: PIC16C558-04I/SO β End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.86 | $4.86 |
| 10 | $4.37 | $43.70 |
| 100 | $3.89 | $389.00 |
| 500 | $3.5 | $1,750.00 |
| 1,000 | $3.11 | $3,110.00 |
PIC16C558-04I/SO Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, RAM, non-volatile program memory (here, one-time-programmable EPROM/OTP), and peripherals on one die. PIC16C5xx MCUs sit inside the hierarchy: PIC16C5xx -> PIC16 family -> PIC16C OTP series -> 8-bit microcontroller -> RISC processor -> embedded computing IC. The 35 single-word instruction set, two-level hardware stack, and direct/indirect/relative addressing modes make the PIC16C558 an easy-to-learn platform for engineers building simple control loops.
Key features include seven or eight Special Function Registers (SFRs), an 8-bit Timer0 with a programmable prescaler, a watchdog timer for fault recovery, and a power-on reset (POR) block. The brown-out reset (BOR) and power-saving SLEEP mode reduce quiescent current for battery-powered nodes. CMOS process technology delivers low power consumption typical of the PIC16C family.
The PIC16C558 uses a Harvard architecture with separate program and data buses, a 12-bit wide instruction word, and an 8-bit wide data path. Two I/O ports (PORTA 5 pins, PORTB 8 pins) provide up to 13 digital I/O lines, and the device operates from 3.0 V to 5.5 V. This combination suits applications needing modest compute and GPIO with deterministic instruction timing rather than high throughput.
Typical applications include appliance controllers, sensor signal conditioning front-ends, automotive body electronics sub-modules, industrial timer/relay controllers, and remote sensor transmitter nodes. Designers value the part for low cost and predictable interrupt latency when migrating from earlier PIC16C5x designs.
When designing with this OTP MCU, remember the program memory cannot be erased electrically; use the PIC16F558 flash variant during prototyping. Place decoupling capacitors as close as possible to VDD/VSS, and respect the 4 MHz maximum oscillator rating with margins for temperature drift.
This page synthesizes distributor pricing, drop-in compatible alternatives, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for PIC16C558-04I/SO β 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 PIC16C558-04I/SO (same form factor and footprint) β differing in Package, Program Memory Type, Program Memory Size, Timers, Core Architecture.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
PIC16F558-04I/SO
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
PIC16C554-04I/SO
β Drop-In β οΈ εζ°εΎ ιͺθ―β In Stock
$1.68 / Unit
View Datasheet βPIC16C558T-04I/SO
β Drop-Inβ In Stock
$2.41 / Unit
View Datasheet βPIC16C558-04/SO
β Drop-Inπ Reference alternative (not in catalog)
PIC16C558-04I/SS
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
PIC16LC558-04I/SO
β Drop-Inπ Reference alternative (not in catalog)
PIC16C558-20I/SO
β Drop-Inβ In Stock
$1.2 / Unit
View Datasheet βPIC16C558-04I/SO Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC 8-bit RISC (Harvard) |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 3.5 KB (2K x 14 words) |
| RAM Size | 128 bytes |
| Data EEPROM | Not present |
| Maximum Clock Frequency | 4 MHz |
| Instruction Cycle Time | 200 ns at 4 MHz |
| Instruction Set Size | 35 single-word instructions |
| Hardware Stack Depth | 2 levels |
| I/O Pins | 13 (PORTA 5-bit, PORTB 8-bit) |
| Timers | 1 x 8-bit (TMR0 with prescaler) |
| Watchdog Timer | Yes |
| Supply Voltage Range | 3.0 V to 5.5 V |
| Operating Temperature Range | -40 C to +85 C (Industrial) |
| Package | 18-SOIC (SOIC-18) |
| Mounting Type | Surface Mount |
| Oscillator Type | External RC or crystal |
| RoHS Status | Non-compliant (industrial legacy OTP) |
PIC16C558-04I/SO Pin Configuration
| Pin 1 | RA2 β PORTA bit 2 (bidirectional I/O) |
| Pin 2 | RA3 β PORTA bit 3 (bidirectional I/O) |
| Pin 3 | RA4/T0CKI β PORTA bit 4 / Timer0 clock input |
| Pin 4 | MCLR/VPP β Master clear reset (active low) / programming voltage |
| Pin 5 | VSS β Ground reference |
| Pin 6 | RB0/INT β PORTB bit 0 / external interrupt input |
| Pin 7 | RB1 β PORTB bit 1 (bidirectional I/O) |
| Pin 8 | RB2 β PORTB bit 2 (bidirectional I/O) |
| Pin 9 | RB3 β PORTB bit 3 (bidirectional I/O) |
| Pin 10 | RB4 β PORTB bit 4 (bidirectional I/O) |
| Pin 11 | RB5 β PORTB bit 5 (bidirectional I/O) |
| Pin 12 | RB6 β PORTB bit 6 (bidirectional I/O) |
| Pin 13 | RB7 β PORTB bit 7 (bidirectional I/O) |
| Pin 14 | VSS β Ground reference (second VSS) |
| Pin 15 | OSC2/CLKOUT β Oscillator crystal output / clock out |
| Pin 16 | OSC1/CLKIN β Oscillator crystal input / external clock in |
| Pin 17 | RA0 β PORTA bit 0 (bidirectional I/O) |
| Pin 18 | RA1 β PORTA bit 1 (bidirectional I/O) |
Typical Applications
PIC16C558-04I/SO is suitable for 7 applications: Appliance Control Boards, Industrial Timer and Relay Controllers, Remote Sensor Transmitter Nodes, Automotive Body Electronics Sub-Modules, Smart Sensor Signal Conditioning, Consumer Remote Controls and Toys, LED Display and Signage Controllers.
Appliance Control Boards
The PIC16C558-04I/SO fits washing machine, dishwasher, and microwave control boards where its 13 GPIO drive relays, triacs, and 7-segment LEDs. The 4 MHz RISC core executes 5 MIPS with deterministic latency, ensuring predictable timing for state-machine control of motor speeds, heater elements, and user input debounce. The 3.5 KB OTP holds menu tables, fault handlers, and safety interlock logic; 128B RAM keeps the run-time stack and I/O buffers within budget. The industrial temperature grade (-40C to +85C) tolerates under-cabinet heat, while 35 single-word instructions shorten firmware certification cycles for white-goods compliance.
Recommended
Industrial Timer and Relay Controllers
The PIC16C558-04I/SO serves industrial relay sequencing panels where deterministic Timer0 tick generation, brown-out reset, and watchdog timer protect against power-line disturbances. Its 200 ns instruction cycle supports scan-time interrupts every 10 ms for relay matrix monitoring. The 13 I/O pins drive up to 13 relays through opto-isolated drivers, while the 3.0-5.5 V supply tolerates battery-backed 5 V rails. Wide -40C to +85C operation supports outdoor cabinets and machine-shop floors; the OTP EPROM prevents code corruption from firmware-update tampering in field-deployed equipment.
Recommended
Remote Sensor Transmitter Nodes
The PIC16C558-04I/SO powers remote sensor transmitter nodes in SCADA and telemetry systems where SLEEP mode draws microamp-level quiescent current and Timer0 wakeups enable multi-year battery life. The 3.5 KB OTP holds sensor linearization tables and Modbus framing code; 128B RAM buffers measurement packets. Industrial -40C to +85C operation tolerates outdoor enclosures; the 35-instruction RISC core simplifies code audits required by industrial safety certifications. Brown-out reset prevents false telemetry on weak batteries, while the watchdog timer recovers nodes from software lockups caused by EMI events.
Recommended
Automotive Body Electronics Sub-Modules
The PIC16C558-04I/SO controls interior body electronics sub-modules such as seat heaters, mirror adjusters, and accessory timers where its 13 GPIO lines drive MOSFETs and opto-isolated loads. The 35-instruction PIC16C core executes 5 MIPS at 4 MHz, sufficient for PWM dimming of cabin lighting and switch debounce on H-bridge motor drivers. Industrial temperature grade covers cabin installations; for under-hood modules, an AEC-Q100-qualified equivalent such as PIC16F1823 must be substituted. Brown-out reset protects against cranking voltage dips during engine start, while the watchdog timer recovers from load-dump transients.
Recommended
Smart Sensor Signal Conditioning
The PIC16C558-04I/SO conditions analog sensor outputs in process-control loops, providing calibration table lookups, linearization, and digital filtering. Its 13 GPIO pins interface to ADC front-ends, switch-sensor inputs, and 4-20 mA current loop transmitters. The 4 MHz core runs a 200 ns interrupt service routine for sample-rate adaptation, while the 35 single-word instructions minimize code size for sensor-specific firmware variants. Industrial temperature grade supports factory-floor deployments, and OTP EPROM prevents inadvertent code changes during HMI reconfiguration events that could corrupt calibration data.
Recommended
Consumer Remote Controls and Toys
The PIC16C558-04I/SO drives consumer remote controls, RC toys, and battery-powered controllers where SLEEP current and code permanence are critical. The 35-instruction PIC16C core executes 5 MIPS while drawing under 2 mA active, ideal for 2xAAA battery-powered devices. The 3.5 KB OTP stores IR protocol encoders (RC5, NEC, Sony SIRC), while 128B RAM holds key scan buffers. Industrial temperature grade covers indoor use; OTP EPROM locks in custom IR codes to prevent unauthorized firmware cloning. The 13 GPIO pins drive IR LEDs, keypad matrixes, and battery-voltage ADC channels.
Recommended
LED Display and Signage Controllers
The PIC16C558-04I/SO drives LED matrix displays, scoreboards, and scrolling signage where its 13 GPIO pins multiplex row/column lines and the 4 MHz core maintains flicker-free refresh rates above 60 Hz. The 35-instruction RISC core executes 5 MIPS, sufficient to scroll text, animate frames, and decode DMX512 input in real time. The 3.5 KB OTP stores font tables and animation sequences; 128B RAM buffers incoming serial data. Industrial -40C to +85C operation handles outdoor marquee installations, while the brown-out reset and watchdog timer protect against partial-display faults during power glitches.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C558-04I/SO β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16F558-04I/SO | PIC16C554-04I/SO | PIC16C558T-04I/SO | PIC16C558-04/SO | PIC16C558-20I/SO |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 18-SOIC | 18-SOIC (same) | 18-SOIC (same) | 18-SOIC (same) | 18-SOIC (same) | 18-SOIC (same) |
| Program Memory | 3.5 KB OTP | 3.5 KB Flash | 0.875 KB OTP (-75%) | 3.5 KB OTP (same) | 3.5 KB OTP (same) | 3.5 KB OTP (same) |
| Max Clock Speed | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 20 MHz (5x faster) |
| RAM | 128 bytes | 128 bytes | 80 bytes (-38%) | 128 bytes | 128 bytes | 128 bytes |
| I/O Pins | 13 | 13 | 12 (-1 pin) | 13 | 13 | 13 |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C | -40C to +85C | -40C to +85C | 0C to +70C (Commercial) | -40C to +85C |
| Memory Type | OTP EPROM | Flash (reprogrammable) | OTP EPROM | OTP EPROM | OTP EPROM | OTP EPROM |
Key Differentiators
- Industrial temperature grade with flash reprogrammability (vs PIC16C554-04I/SO)
- Same die, in-circuit reprogrammable flash memory (vs PIC16F558-04I/SO)
- 5x faster clock headroom with same die (vs PIC16C558-20I/SO)
Design Notes
OTP EPROM cannot be erased electrically; once programmed, the device's code is permanent. Use the flash-based PIC16F558-04I/SO during prototyping and code validation. Reserve the PIC16C558-04I/SO for cost-sensitive, code-final production runs. Always maintain a verified firmware archive and a re-order quantity in case last-time-buy windows close unexpectedly under the NRND lifecycle status.
Place a 0.1 uF decoupling capacitor as close as possible to the VDD pin (typically pin 14 or pin 17 depending on datasheet variant), with a second 10 uF bulk capacitor nearby. Route the crystal oscillator traces short and symmetric, guard them with a ground plane, and keep oscillator traces away from switching lines to prevent timing jitter. The MCLR pin (pin 4) requires a 10 kohm pull-up to VDD for normal operation.
Estimated: at VDD = 5 V, oscillator active, and all GPIO pins toggling at 200 kHz, the PIC16C558-04I/SO draws approximately 2 mA active and 1 uA in SLEEP. Power dissipation at full active load is approximately 10 mW, well within the SOIC-18 thermal envelope (theta_JA around 75 C/W). No heatsink is required. Industrial -40C to +85C operation is supported without derating for typical 5 V supply levels in closed enclosures.
The PIC16C558-04I/SO supports brown-out reset (BOR) for predictable behavior during supply drops. Configure BOR threshold via configuration bits for 4.0 V or 2.5 V depending on the system supply. SLEEP mode reduces current draw to microamp levels for battery-powered designs; wake-up via Watchdog Timer overflow or external interrupt on RB0/INT pin (pin 6) enables ultra-low-power remote sensor nodes.
Compliance Information
RoHS non-compliant per Microchip product page (legacy industrial OTP). Not AEC-Q100 qualified. Conflict-minerals compliant per Microchip supply-chain disclosure. REACH status unknown from provided data.
