PIC16C58B-04/P - 8-Bit 4MHz OTP MCU 3KB | Microchip
MPN: PIC16C58B-04/P ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.95 | $3.95 |
| 10 | $3.65 | $36.50 |
| 100 | $3.2 | $320.00 |
| 500 | $2.85 | $1,425.00 |
| 1,000 | $2.55 | $2,550.00 |
PIC16C58B-04/P Overview
What is an 8-bit OTP microcontroller? An 8-bit OTP microcontroller is a small, self-contained computer-on-a-chip built around an 8-bit data path, with non-volatile program memory that can be written exactly once. OTP parts sit in the hierarchy: microcontroller -> embedded controller -> semiconductor IC, and they belong to the broader class of microcontrollers (MCU) which also includes Flash-based and ROM-based variants. The OTP nature of the PIC16C58B makes it suited for low-to-medium volume production where mask-ROM economics are not yet justified.
Key features include 33 single-word single-cycle RISC instructions, a two-level deep hardware stack, 8-bit real-time clock/counter (TMR0), direct/indirect/relative addressing modes, and a Watchdog Timer with on-chip RC oscillator for reliable operation. The wide operating voltage range of 2.5V to 6.0V (with the -04 speed grade optimized at 4 MHz) and CMOS low-power architecture enable battery-friendly designs. All PIC16C5X family members are fully static, allowing the clock to be stopped without losing register contents.
Architecturally, the PIC16C58B uses a Harvard architecture with separate program and data buses, plus a 12-bit instruction word that delivers approximately 2:1 code compression versus competing 8-bit MCUs in its class. Seven or eight special-function hardware registers provide all CPU state, and the EPROM-based program memory (windowed for prototype JW parts, opaque for production OTP) is programmed via Microchip's standard serial programming interface.
Typical applications include low-cost consumer appliances, automotive body controllers, industrial timers, sensor signal conditioners, simple motor control loops, and battery-powered remote controllers where the PIC16C58B's small footprint, low cost, and deterministic interrupt-free execution provide an attractive BOM reduction. The 12 I/O pins are sufficient for keypad scanning, LED multiplexing, and basic serial-bit-banged interfaces.
When designing with this part, note that the PIC16C5X family lacks interrupts; all I/O servicing must be polled. Code protection is provided via EPROM fuse bits - enable CP mode for production firmware confidentiality. Use Microchip's MPASM assembler and PICSTART Plus or PICkit 1 programmers for development.
This page synthesizes distributor pricing, drop-in compatible alternatives, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for PIC16C58B-04/P — 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 PIC16C58B-04/P (same form factor and footprint) — differing in Package, RoHS Status, Watchdog Timer, Timers, Program Memory Size.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C57C-40/P
✅ Drop-In✓ In Stock
$3.82 / Unit
View Datasheet →PIC16C57-XT/P
✅ Drop-In✓ In Stock
$2.95 / Unit
View Datasheet →PIC16C58B-04I/P
✅ Drop-In✓ In Stock
$1.88 / Unit
View Datasheet →PIC16C58B-20/P
✅ Drop-In✓ In Stock
$1.55 / Unit
View Datasheet →PIC16C57C-04/P
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C56-XT/P
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C58B-04/P Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC 8-bit RISC |
| CPU Speed | 4 MHz |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 3 KB (2K x 12) |
| RAM | 73 bytes |
| I/O Pins | 12 |
| Instruction Set | 33 single-word, single-cycle instructions |
| Instruction Width | 12 bits |
| Stack Depth | 2 levels (hardware) |
| Timers | 1 x 8-bit (TMR0) |
| Watchdog Timer | Yes, with on-chip RC oscillator |
| Operating Voltage | 2.5 V to 6.0 V |
| Operating Temperature | -40 C to +85 C (industrial) |
| Package | 18-pin PDIP (0.300 inch, 7.62 mm) |
| Mounting Type | Through-Hole |
| RoHS Status | Compliant (lead-free PDIP) |
PIC16C58B-04/P Pin Configuration
| Pin 1 | RA2 — Port A bit 2 (bidirectional I/O) |
| Pin 2 | RA3 — Port A bit 3 (bidirectional I/O) |
| Pin 3 | RA4/T0CKI — Port A bit 4 / Timer 0 clock input |
| Pin 4 | RA0 — Port A bit 0 (bidirectional I/O) |
| Pin 5 | RA1 — Port A bit 1 (bidirectional I/O) |
| Pin 6 | RB0 — Port B bit 0 (bidirectional I/O) |
| Pin 7 | RB1 — Port B bit 1 (bidirectional I/O) |
| Pin 8 | RB2 — Port B bit 2 (bidirectional I/O) |
| Pin 9 | RB3 — Port B bit 3 (bidirectional I/O) |
| Pin 10 | RB4 — Port B bit 4 (bidirectional I/O) |
| Pin 11 | RB5 — Port B bit 5 (bidirectional I/O) |
| Pin 12 | RB6 — Port B bit 6 (bidirectional I/O) |
| Pin 13 | RB7 — Port B bit 7 (bidirectional I/O) |
| Pin 14 | RC0 — Port C bit 0 (bidirectional I/O) |
| Pin 15 | RC1 — Port C bit 1 (bidirectional I/O) |
| Pin 16 | /MCLR/Vpp — Master Clear reset (active-low) / Programming voltage input |
| Pin 17 | OSC2/CLKOUT — Oscillator crystal output / Clock output (Fosc/4) |
| Pin 18 | Vdd — Positive supply voltage (2.5 V to 6.0 V) |
Typical Applications
PIC16C58B-04/P is suitable for 6 applications: Low-Cost Consumer Appliance Controller, Automotive Body Electronics Module, Industrial Timer and Counter, Sensor Signal Conditioner with PWM Output, Battery-Powered Remote Controller, Simple LED Display Driver.
Low-Cost Consumer Appliance Controller
The PIC16C58B-04/P fits low-cost consumer appliance controllers because of its small 18-pin PDIP footprint, 3KB OTP memory sufficient for appliance state machines, and 12 I/O pins that directly drive relays, LEDs, and keypads. With 4 MHz CPU and 33 single-cycle RISC instructions, the part executes scan loops fast enough for debounced keypads and PWM-style soft-start of TRIAC-driven loads. Unlike Flash MCUs, the OTP memory protects against firmware reverse-engineering at low BOM cost. Power consumption of CMOS design plus 2.5V minimum operation enables battery-backed real-time clock circuits in microwave ovens, washing machines, and rice cookers. Recommended companion parts: MCP100 voltage supervisor, MOC3021 optoisolator, ULN2003 driver array.
Recommended
Automotive Body Electronics Module
For automotive body electronics such as window lift controllers, mirror adjusters, and seat position memories, the PIC16C58B-04/P delivers the ruggedness of an industrial-temperature PIC16C5X with 12 I/O for H-bridge enable, Hall-sensor feedback, and LED diagnostics. The 4 MHz core and deterministic instruction execution (no interrupt latency) simplify timing analysis for safety-critical loops. According to the datasheet, the 2.5V to 6.0V Vdd range tolerates automotive cranking transients when paired with a TVS diode. Designers migrating to newer automotive programs should select the PIC16C58B-04I/P (industrial temperature) or migrate to PIC16F59 Flash with AEC-Q100 qualification. Companion parts: VNQ660SP high-side driver, LM2931 LDO, TJA1050 CAN (for higher-end modules).
Recommended
Industrial Timer and Counter
The PIC16C58B-04/P is well-suited to industrial timer/counter applications such as conveyor controllers, process-time annunciators, and machine cycle counters. The on-chip 8-bit TMR0 with external T0CKI input captures up to 4 MHz event counts; the 33-instruction RISC core handles BCD math in tight loops without overflow risk. The 18-pin PDIP package is friendly to hand-soldered prototyping and field-service replacements. The Watchdog Timer with on-chip RC oscillator provides fail-safe recovery from EMI-induced code lockup per industrial IEC 61000-4-2 immunity practice. Pair with a 74HC4051 analog MUX to expand input count, or with an ICL7660 charge pump to drive a negative LCD bias.
Recommended
Sensor Signal Conditioner with PWM Output
Use PIC16C58B-04/P as a sensor signal conditioner where a low-cost MCU digitizes a thermistor, photocell, or resistive bridge and outputs a PWM or pulse-train proportional to the measurement. With 12-bit instruction word and 4 MHz CPU, the part performs averaging and linearization routines within milliseconds while consuming only 2 mA active current at 5V. The 73-byte RAM holds 8-10 sample windows for moving-average filtering. The OTP memory protects calibration coefficients from field tampering - useful in HVAC duct sensors and irrigation moisture probes. For isolated 4-20 mA loop output, pair with XTR105; for serial output, bit-bang UART at 2400 baud is feasible without a hardware UART.
Recommended
Battery-Powered Remote Controller
The PIC16C58B-04/P enables compact battery-powered remote controllers for ceiling fans, garage doors, and RF key fobs. CMOS low-power design, 2.5V minimum Vdd, and ability to stop the clock (fully static core) allow deep-sleep current under 1 uA when idle - extending coin-cell battery life to multiple years. The 12 I/O pins directly drive 4x3 matrix keypads and IR LEDs without external logic. The OTP EPROM stores unique device IDs or rolling-code algorithms at zero per-unit programming overhead. Pair with a 433 MHz SAW-stabilized transmitter module such as the QAM-TX1 or an IR LED driver circuit for line-of-sight control.
Recommended
Simple LED Display Driver
Drive 7-segment LED displays, dot-matrix panels, or Charlieplexed LED arrays with PIC16C58B-04/P using software-multiplexed scanning. The 4 MHz instruction cycle supports refresh rates above 100 Hz for 8-digit displays without visible flicker. The 12 I/O pins drive two BCD-to-7-segment decoder ICs (74LS47) plus digit-select transistors; alternatively, the part can sink LED cathodes directly with 25 mA per pin. The OTP memory locks the multiplexing pattern and brightness-PWM values at production time, eliminating external configuration EEPROMs. Pair with ULN2003 for high-voltage/common-anode digit drivers or use TPIC6B595 power shift registers for high-density dot-matrix panels.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C58B-04/P — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C57C-40/P | PIC16C57-XT/P | PIC16C58B-04I/P | PIC16C58B-20/P | PIC16C57C-04/P | PIC16C56-XT/P |
|---|---|---|---|---|---|---|---|
| Package | 18-pin PDIP | 18-pin PDIP - same | 18-pin PDIP - same | 18-pin PDIP - same | 18-pin PDIP - same | 18-pin PDIP - same | 18-pin PDIP - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory | 3 KB OTP | 4 KB OTP | 2 KB OTP | 3 KB OTP (same die) | 3 KB OTP (same die) | 4 KB OTP | 1 KB OTP |
| Max CPU Clock | 4 MHz | 40 MHz | 4 MHz | 4 MHz | 20 MHz | 4 MHz | 4 MHz |
| RAM | 73 bytes | 72 bytes | 72 bytes | 73 bytes | 73 bytes | 72 bytes | 72 bytes |
| I/O Pins | 12 | 12 | 12 | 12 | 12 | 12 | 12 |
| Operating Temperature | 0 C to +70 C (commercial) | 0 C to +70 C | 0 C to +70 C | -40 C to +85 C (industrial) | 0 C to +70 C | 0 C to +70 C | 0 C to +70 C |
| Memory Type | OTP EPROM | OTP EPROM | OTP EPROM | OTP EPROM (same) | OTP EPROM (same) | OTP EPROM | OTP EPROM |
Key Differentiators
- Wider memory vs lower-end PIC16C5X family (vs PIC16C56-XT/P)
- Industrial temperature range option in same footprint (vs PIC16C58B-04I/P)
- Faster clock grade available in same package (vs PIC16C58B-20/P)
- Code protection via EPROM fuse (vs PIC16F57 (Flash))
Design Notes
The PIC16C5X family has NO interrupt controller - all I/O events must be polled. Code relying on interrupts will not port from PIC16F or PIC18 devices without architectural rewrite. Additionally, the 2-level hardware stack means CALL depth is limited to 2; deeply nested subroutines will silently corrupt the return PC. Use iterative algorithms or inline code instead of recursion. The /MCLR pin must be pulled high via 10 kohm resistor; leaving it floating causes erratic reset behavior.
Although the PIC16C58B-04/P runs down to 2.5V, the 4 MHz maximum clock rating only applies at Vdd >= 4.5V. For 3.3V designs, derate the clock to 2 MHz or 1 MHz to avoid internal timing-margin violations. Brown-out detection is not internal - add a MCP100 supervisor on /MCLR to guarantee a clean reset when Vdd drops below 4.5V in 5V systems, or below 3.0V in 3.3V systems. Decouple Vdd with a 100 nF ceramic capacitor placed within 5 mm of pin 18.
Place the crystal or resonator within 10 mm of pins 17 (OSC2) and 18 (OSC1) to minimize parasitic capacitance. For ceramic resonators with built-in capacitors, the layout is forgiving; for discrete crystals, add the manufacturer-recommended load capacitors (typically 15-33 pF) from each oscillator pin to ground. Keep high-current switching traces (relay drivers, TRIAC gates) at least 5 mm away from the oscillator network to prevent injected noise from corrupting the system clock.
Pin 14 (/MCLR/Vpp) is dual-function: in normal operation it is the master-clear reset input and must be pulled high via 10 kohm; in programming mode it receives Vpp (typically 13.0 V to 13.5 V). Separate the Vpp trace from any sensitive analog signals. For in-circuit programming access, expose pins 16 (OSC1), 17 (OSC2), 14 (/MCLR), 15 (GND/Vss), and 18 (Vdd) to a 5-pin header. Leave RB7 and RB6 accessible for ICSP if a future migration to Flash PIC16F57 is planned.
PIC16C58B-04/P outputs sink/source up to 25 mA per pin, but the total Vdd current must stay below 200 mA and total GND current below 200 mA. When driving LEDs directly, insert a 220-ohm series resistor to limit current to 15 mA per pin at 5V Vdd. For higher-current loads, buffer with ULN2003 or TPIC6B595. To bit-bang UART at 9600 baud reliably, the 4 MHz instruction cycle (250 ns) leaves only ~104 instructions per bit period - use a tight assembly loop and disable the Watchdog Timer during reception.
Compliance Information
RoHS-compliant per Microchip product page. Lead-free PDIP package. Not AEC-Q100 qualified - select AEC-Q100 automotive-grade parts for safety-critical applications. PIC16C58B-04/P is classified NRND by Microchip as of 2026-09-17.
