PIC16C58BT-04/SO - 4MHz 8-Bit EPROM MCU, 3KB OTP, 18-SOIC
MPN: PIC16C58BT-04/SO β End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.75 | $6.75 |
| 10 | $6.07 | $60.70 |
| 100 | $5.4 | $540.00 |
| 500 | $4.85 | $2,425.00 |
| 1,000 | $4.32 | $4,320.00 |
PIC16C58BT-04/SO Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (ROM/EPROM/Flash), data memory (RAM), and peripheral I/O on one die. The PIC16C5X family is the lowest-cost member of Microchip's original 12-bit instruction-set PIC microcontrollers, targeting cost-sensitive embedded control applications where simple sequential logic replaces discrete components. The 4 MHz PIC16C58B executes one instruction per internal clock cycle (four oscillator clocks), giving approximately 1 MIPS performance - adequate for I/O scanning, timer-based control, and simple serial protocols but well below modern 8-bit Flash MCU speeds.
The defining electrical feature of the PIC16C58B is its 33 single-word instructions with 12-bit-wide opcodes, providing the well-known 2:1 code compression advantage over competing 8-bit architectures of its era. Its fully static CMOS design allows the clock to be stopped for true zero-power wait states, and the 12 bidirectional I/O pins can source or sink up to 25 mA per pin - sufficient to drive LEDs, relays, and small solenoids directly without external transistors. The device includes an 8-bit real-time timer/counter with a programmable prescaler, a watchdog timer for reliable unattended operation, and a power-on reset circuit that holds the part in reset until VDD is stable.
The PIC16C58B uses a RISC (Reduced Instruction Set Computer) Harvard architecture with separate program and data buses, eliminating the fetch-overlap bottleneck found in von-Neumann designs of the same vintage. EPROM-based program memory makes this part well suited for prototyping and low-to-medium volume production where Flash reprogrammability is not required, but where mask-ROM tooling NRE costs are prohibitive. The 18-pin SOIC footprint (0.300 inch / 7.50 mm wide body) is one of the most widely supported 8-bit MCU outlines, simplifying PCB layout and post-production re-programmability through a third-party EPROM eraser and programmer.
Typical applications include appliance controllers, HVAC damper and fan control, automotive body electronics, simple sensor signal conditioning, security alarm keypads, and low-cost consumer products. Industrial designers use it for 4-20 mA loop-powered sensor transmitters, vending machine coin acceptors, and battery-backed utility metering where the 4 MHz MIPS budget is sufficient and EPROM one-time-programmability is acceptable. The wide operating temperature variants (I and E suffixes) make it viable for outdoor and automotive under-hood deployments.
The PIC16C58B supports the standard PIC16C5X development toolchain including the PICSTART Plus programmer and MPLAB-SIM simulator; design verification on modern toolchains requires PICkit 3/4 with a 40-to-18-pin adapter. To ensure OTP programming yields, design with one or two unused I/O pins free, and route MCLR as a dedicated reset line separated from digital switching traces. Engineers migrating from PIC16C58B to current production should consider the flash-based PIC16F57 or PIC16F1825 in compatible packages.
This page synthesizes distributor pricing, drop-in alternatives, parametric comparison, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for PIC16C58BT-04/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 PIC16C58BT-04/SO (same form factor and footprint) β differing in Core Architecture, Mounting Type, Operating Temperature Range, Program Memory Size, Program Memory Type.
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Request AlternativesPIC16C58BT-04/SO Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit PIC (PIC16C5X family) |
| Instruction Set Width | 12-bit (33 single-word instructions) |
| Program Memory Type | EPROM / One-Time-Programmable (OTP) |
| Program Memory Size | 3KB (2K x 12 words) |
| Data RAM | 73 bytes |
| Data EEPROM | Not present |
| Maximum CPU Clock Frequency | 4 MHz |
| Internal Execution Rate | 1 MIPS (4 clocks per instruction cycle) |
| Supply Voltage (VDD) | 3.0 V to 5.5 V (5 V typical) |
| I/O Pins | 12 bidirectional digital I/O |
| I/O Sink/Source Current | 25 mA per pin (max) |
| Timers | 8-bit RTCC with 8-bit programmable prescaler |
| Watchdog Timer | Yes (independent on-chip WDT) |
| Reset Sources | Power-on Reset (POR), MCLR, WDT |
| Operating Temperature Range | 0C to +70C (commercial; I/E variants cover -40C to +125C) |
| Package | 18-pin SOIC (SO) wide-body, 7.50 mm |
| Mounting Type | Surface Mount (Tape & Reel) |
| RoHS Status | Compliant per distributor listings |
PIC16C58BT-04/SO Pin Configuration
| Pin 1 | RA2 β Bidirectional I/O port A, bit 2 |
| Pin 2 | RA3 β Bidirectional I/O port A, bit 3 |
| Pin 3 | RTCC β Real-time counter/timer input (Schmitt trigger) |
| Pin 4 | MCLR β Master clear reset input (active low) |
| Pin 5 | VSS β Ground reference |
| Pin 6 | RB0 β Bidirectional I/O port B, bit 0 |
| Pin 7 | RB1 β Bidirectional I/O port B, bit 1 |
| Pin 8 | RB2 β Bidirectional I/O port B, bit 2 |
| Pin 9 | RB3 β Bidirectional I/O port B, bit 3 |
| Pin 10 | RB4 β Bidirectional I/O port B, bit 4 |
| Pin 11 | RB5 β Bidirectional I/O port B, bit 5 |
| Pin 12 | RB6 β Bidirectional I/O port B, bit 6 |
| Pin 13 | RB7 β Bidirectional I/O port B, bit 7 |
| Pin 14 | VSS β Ground reference (second pin for PIC16C58B SOIC package) |
| Pin 15 | OSC1 β Oscillator input / external clock in |
| Pin 16 | OSC2 β Oscillator output (crystal mode) |
| Pin 17 | RA0 β Bidirectional I/O port A, bit 0 |
| Pin 18 | RA1 β Bidirectional I/O port A, bit 1 |
Typical Applications
PIC16C58BT-04/SO is suitable for 6 applications: Appliance Front-Panel Controller, Automotive Body Electronics, HVAC Damper and Fan Controller, Security Alarm Keypad and Siren Driver, Vending Coin Acceptor Logic, Industrial Sensor Loop Transmitter.
Appliance Front-Panel Controller
The PIC16C58BT-04/SO's 12 bidirectional I/O pins, 25 mA per-pin sink/source, and 4 MHz execution rate suit appliance front-panel controllers that drive multiplexed 7-segment LED displays and read capacitive or resistive keypads. The 3KB OTP program memory holds the state machine for washer, dryer, or microwave cook profiles. Its NRND status and EPROM one-time-programmability match mature, long-life-cycle appliance SKUs where firmware never changes after release. Use the on-chip 8-bit RTCC to debounce key inputs and generate beep tones via bit-banged PWM on an I/O pin. The SOIC-18 wide-body package reflows cleanly on standard lead-free SMT lines.
Recommended
Automotive Body Electronics
The PIC16C58BT-04I/SO industrial variant (drop-in, same die) operates from -40C to +85C, matching under-dash automotive body modules such as power-window controllers, mirror-adjust switches, and seat-memory logic. The MCU's 4 MHz MIPS budget is sufficient for encoder decoding and PWM-driven motor direction control. Each I/O drives small relay coils directly at 25 mA. The WDT provides unattended-operation reset for unattended body modules in the field. Designers should route MCLR as a dedicated reset and place a 100 nF decoupling cap within 5 mm of VDD to survive cranking transients.
Recommended
HVAC Damper and Fan Controller
The PIC16C58BT-04/SO's 73-byte RAM, 8-bit RTCC, and 12 I/O suit HVAC damper-actuator and multi-speed-fan controllers, where firmware reads NTC thermistor voltage via on-chip comparator logic and switches TRIAC-gated outputs. The 5V supply rails directly from a small linear regulator off 24 VAC. The 3KB OTP holds dozens of fan curves and damper profiles for different OEM configurations. Low-power CMOS Run mode (~2 mA at 4 MHz, 5V) keeps dissipation low in wall-mounted controllers. Industrial-temperature variants serve rooftop unit (RTU) controls.
Recommended
Security Alarm Keypad and Siren Driver
The PIC16C58BT-04/SO's matrix-scanning I/O and 25 mA per-pin drive suit PIR keypad scanners where each I/O row-column is read in software to detect key presses and trigger the alarm loop. The on-chip WDT recovers from ESD-induced program-flow corruption - a common field failure in security panels. The 3KB OTP holds dual-tone siren patterns, code-comparison logic, and entry/exit delay counters. Industrial-temperature variants work in unheated garages and warehouses. Engineers should debounce keys via software timers and reserve one I/O for a self-test LED.
Recommended
Vending Coin Acceptor Logic
The PIC16C58BT-04/SO's small 18-pin footprint, 4 MHz MIPS, and OTP memory fit coin and bill acceptor modules in vending machines. The firmware samples coin-slot photodetector timing patterns and validates acceptance windows, then drives accept/reject solenoids through Darlington buffers. The 3KB OTP holds coin profile tables for dozens of denominations. EPROM one-time-programmability matches coin-set designs that never change post-release. Industrial-temperature variants suit outdoor vending enclosures. Designers should use WDT to recover from EMI-induced lockups.
Recommended
Industrial Sensor Loop Transmitter
The PIC16C58BT-04/SO powers 4-20 mA loop transmitters that read bridge-type pressure or load sensors and convert the value to a current-loop output via PWM-to-current conversion. The 12-bit instruction word and 73-byte RAM hold linearization tables for thermocouple or strain-gauge inputs. The wide 3.0V to 5.5V supply tolerates regulated 24V loop drops through series diodes. The SOIC-18 wide-body package reflows onto small PCBs that fit inside standard conduit-head enclosures. Industrial-temperature variants serve outdoor process-plant installations.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C58BT-04/SO β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C58BT-04E/SO | PIC16C58BT-04I/SO | PIC16F57-I/SO |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 18-pin SOIC (SO) 7.50 mm | 18-pin SOIC - same | 18-pin SOIC - same | 18-pin SOIC - same |
| Program Memory | 3KB OTP EPROM | 3KB OTP EPROM | 3KB OTP EPROM | 2KB Flash (reprogrammable) |
| Data RAM | 73 bytes | 73 bytes | 73 bytes | 128 bytes |
| Max Clock Frequency | 4 MHz | 4 MHz | 4 MHz | 20 MHz |
| I/O Pins | 12 | 12 | 12 | 12 |
| Operating Temperature | 0C to +70C (commercial) | -40C to +125C (extended) | -40C to +85C (industrial) | -40C to +85C (industrial) |
| Programming Method | Parallel EPROM programmer | Parallel EPROM programmer | Parallel EPROM programmer | ICSP (in-circuit serial programming) |
| Supply Voltage | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 2.0 V to 5.5 V (wider range) |
| Lifecycle Status | NRND | NRND | NRND | Active |
Key Differentiators
- Simplest and lowest-cost PIC16C5X OTP MCU with 3KB memory (vs PIC16F57-I/SO)
- Wide operating temperature grade available in same footprint (vs PIC16C58BT-04/SO (commercial))
- Larger 3KB program memory within the PIC16C5X family (vs PIC16C56A-04/SO (2KB))
Design Notes
The PIC16C58BT-04/SO requires a single 5V (3.0V to 5.5V) supply on the VDD pin and a clean VSS return. Place a 100 nF decoupling capacitor within 5 mm of the VDD pin to suppress switching transients; for applications driving inductive loads (relays, solenoids, buzzers), add a bulk 10 uF electrolytic at the regulator output. The MCU draws approximately 2 mA at 4 MHz/5V in Run mode and < 1 uA in Standby (clock stopped). For battery-backed designs, switch the regulator off in standby rather than relying on internal sleep modes of this classic PIC16C5X family, which does not feature true Sleep mode.
The 18-pin SOIC wide-body (7.50 mm) footprint accepts both lead and lead-free reflow profiles; recommended peak temperature is 245C to 250C with 60 s above 217C. Route MCLR with a short, direct trace and place its 10 kohm pull-up and 100 nF capacitor within 5 mm of the pin to ensure clean reset edges. Place the 18 to 33 pF oscillator-load capacitors (crystal mode) close to OSC1/OSC2 to minimize parasitic capacitance. Route clock traces away from RB-port switching lines to avoid injection of EMI into the oscillator.
Do not attempt In-Circuit Serial Programming (ICSP) on the PIC16C58BT-04/SO; this OTP part requires a parallel EPROM programmer such as the PICSTART Plus or Data I/O ProMax with a 40-to-18-pin adapter. The OTP cell can be programmed only once - any code error requires a new device, so validate firmware in MPLAB-SIM and on a PIC16F57-I/SO Flash equivalent before committing to production. The 3KB OTP memory is shared with the PIC16C55 (1KB) and PIC16C56 (2KB) variants; verify that your linker is targeting the 0x000-0x7FF range of the PIC16C58B. The WDT is enabled by configuration fuse and must be cleared via CLRWDT inside any time-critical loop to prevent unintended resets.
The PIC16C58BT-04/SO dissipates approximately 10 mW at 4 MHz/5V typical load - well below thermal limits for the SOIC-18 package (theta_JA ~ 70 C/W). No heatsink is required for normal operation. However, when I/O pins source 25 mA continuously into LEDs, add 220 ohm to 470 ohm series resistors to limit die heating. For industrial-temperature (-40C to +85C) variants of the same die (PIC16C58BT-04I/SO), the same thermal envelope applies. For extended-temperature (-40C to +125C) PIC16C58B-04E/SO, derate I/O drive above 100C ambient by 10 percent per 10C as a conservative practice.
Compliance Information
RoHS and lead-free confirmed via Mouser and DigiKey product listings (DigiKey p/n PIC16C58BT-04-SO-ND). AEC-Q100 not qualified - automotive customers should consider AEC-Q100-qualified PIC16F57 or PIC16F1825 alternatives. Halogen-free status not stated in distributor data.
