PIC16C58BT-40/SO - 8-Bit 40MHz OTP MCU, 3KB | Microchip
MPN: PIC16C58BT-40/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.2 | $5.20 |
| 10 | $4.85 | $48.50 |
| 100 | $4.4 | $440.00 |
| 500 | $3.95 | $1,975.00 |
| 1,000 | $3.5 | $3,500.00 |
PIC16C58BT-40/SO Overview
An 8-bit microcontroller (MCU) is a small, low-cost computing core that integrates a CPU, RAM, non-volatile program memory, and on-chip peripherals into a single IC. The PIC16C5X architecture sits inside the broader taxonomy of microcontrollers -> embedded controllers -> semiconductors, and is optimized for cost-sensitive, deterministic control tasks. The 12-bit wide instruction set delivers a 2:1 code compression advantage over other 8-bit MCUs in its class, reducing ROM requirements for a given feature set.
Key features include 12 I/O pins, one 8-bit timer/counter with watchdog timer (WDT) function, Power-On Reset (POR), brown-out detection variants, a programmable code-protection mechanism, and an operating voltage range of 3.0 V to 5.5 V. The fully-static CMOS design eliminates the minimum clock frequency requirement, allowing the device to be clocked down to DC for low-power standby states.
Typical applications for the PIC16C58BT-40/SO include appliance controls, security system panels, automotive sub-system controllers (non-safety), low-end sensor interfaces, and battery-powered consumer products. Its wide operating temperature range and OTP memory make it suitable for high-volume, code-stable embedded products.
Designers should note that the OTP memory cannot be electrically erased or rewritten after programming; a windowed ceramic package variant (PIC16C58B-40/JW) is required for development and code iteration. Adequate decoupling (0.1 µF ceramic close to VDD/VSS) and an in-circuit serial programming (ICSP) header should be reserved on the PCB even when production programming is performed externally.
This page synthesizes distributor availability, cross-brand and same-brand drop-in alternatives in the SOIC-18 footprint, and practical design notes not consolidated in the manufacturer datasheet.
Drop-in alternatives for PIC16C58BT-40/SO — 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-40/SO (same form factor and footprint) — differing in Program Memory Size, Program Memory Type, Package, Family, I/O Pins.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C58BT-04/SO
✅ Drop-In✓ In Stock
$4.32 / Unit
View Datasheet →PIC16C58BT-20/SO
✅ Drop-In✓ In Stock
$2.05 / Unit
View Datasheet →PIC16C58B-20E/SO
✅ Drop-In✓ In Stock
$1.85 / Unit
View Datasheet →PIC16C58B-40/SS
✅ Drop-In✓ In Stock
$0.72 / Unit
View Datasheet →PIC16C57CT-40/SO
✅ Drop-In✓ In Stock
$5.45 / Unit
View Datasheet →PIC16C58BT-40/SO Maximum Ratings & Electrical Characteristics
| Series | PIC® 16C |
| Core Architecture | 8-bit RISC |
| Core Size | 8-bit |
| Maximum Clock Frequency | 40 MHz |
| Program Memory Type | OTP (One-Time Programmable) EPROM |
| Program Memory Size | 3 KB (2K × 12-bit words) |
| Data RAM | 73 bytes |
| Number of I/O Pins | 12 |
| Number of Timers | 1 (8-bit with WDT) |
| Watchdog Timer (WDT) | Yes |
| Power-On Reset (POR) | Yes |
| Supply Voltage Range | 4.5 V to 5.5 V |
| Operating Temperature Range | 0 °C to +70 °C (Commercial) |
| Package Type | 18-pin SOIC (SO), gull-wing |
| Package Body Width | 7.50 mm (0.295 in) |
| Mounting Type | Surface Mount |
| Terminal Form | GULL WING |
| RoHS Status | Compliant |
| MSL Level | MSL 1 (per JEDEC J-STD-020, generally) |
| Lead-Free | Yes |
PIC16C58BT-40/SO Pin Configuration
| Pin 1 | /MCLR — Master Clear (active-low reset input) |
| Pin 2 | RA0 — Bidirectional digital I/O, PORTA bit 0 |
| Pin 3 | RA1 — Bidirectional digital I/O, PORTA bit 1 |
| Pin 4 | RA2 — Bidirectional digital I/O, PORTA bit 2 |
| Pin 5 | RA3 — Bidirectional digital I/O, PORTA bit 3 |
| Pin 6 | RA4/T0CKI — Bidirectional digital I/O / Timer 0 clock input |
| Pin 7 | VSS — Ground reference |
| Pin 8 | OSC1 — Oscillator input / external clock input |
| Pin 9 | OSC2 — Oscillator output (crystal/resonator mode) |
| Pin 10 | RB0/INT — Bidirectional digital I/O / external interrupt input |
| Pin 11 | RB1 — Bidirectional digital I/O, PORTB bit 1 |
| Pin 12 | RB2 — Bidirectional digital I/O, PORTB bit 2 |
| Pin 13 | RB3 — Bidirectional digital I/O, PORTB bit 3 |
| Pin 14 | RB4 — Bidirectional digital I/O, PORTB bit 4 |
| Pin 15 | RB5 — Bidirectional digital I/O, PORTB bit 5 |
| Pin 16 | RB6 — Bidirectional digital I/O, PORTB bit 6 |
| Pin 17 | RB7 — Bidirectional digital I/O, PORTB bit 7 |
| Pin 18 | VDD — Positive supply voltage (5 V nominal) |
Typical Applications
PIC16C58BT-40/SO is suitable for 6 applications: Appliance Control Panels (White Goods), Security System Sensor Nodes, Automotive Sub-System Controllers (Non-Safety), Battery-Powered Consumer Devices, Industrial Sensor Interfaces, Hobbyist and Educational Embedded Projects.
Appliance Control Panels (White Goods)
The PIC16C58BT-40/SO fits cost-optimized appliance control boards where the firmware is code-stable across the product lifecycle and field updates are not required. Its 3 KB OTP memory holds washing-machine, dishwasher, and microwave user-interface state machines, while the 12 I/O pins drive relay banks, LED indicators, and 7-segment displays. The 40 MHz core executes scan loops faster than the 100 ms human-perception threshold, ensuring debounced key responses without visible latency. Unlike flash MCUs, the OTP prevents after-market firmware tampering - useful for OEM warranty control and certification stability. The 73 bytes RAM comfortably holds timer flags, mode state, and a small keypad buffer without paging. The commercial 0-70 °C range covers indoor appliance environments.
Recommended
Security System Sensor Nodes
The PIC16C58BT-40/SO suits PIR motion detectors, glass-break sensors, and door-contact transmitters in security panels. The OTP memory prevents reverse engineering of proprietary detection algorithms, a key consideration when competitors attempt to clone OEM products. The 8-bit timer with watchdog keeps the MCU in sleep most of the time, waking on interrupt to sample sensors and transmit - the fully-static CMOS design supports clock-down to DC for low quiescent current. The 40 MHz clock allows burst-mode RF encoding (e.g., 433 MHz ASK/FSK sub-carrier generation) at firmware level without external timing chips. With 12 I/O, designers wire the PIR output, LED indicator, tamper switch, and an RF module enable line without multiplexing.
Recommended
Automotive Sub-System Controllers (Non-Safety)
Although not AEC-Q100, the PIC16C58BT-40/SO handles interior lighting controllers, ambient LED drivers, seat-position memory, and HVAC flap motors in entry-level automotive trim. The 40 MHz instruction rate provides deterministic 1 ms PWM resolution on 8-bit timer, suitable for motor-speed and LED-dimming control loops. With 12 I/O and 3 KB code space, one PIC16C58BT-40/SO drives a 4-channel LED driver IC via SPI bit-bang and reads Hall sensors for closed-loop feedback. The OTP memory locks proprietary calibration tables, preventing aftermarket cloning of OEM-tunable features. Designers target commercial grade since cabin temperatures stay within 0-70 °C.
Recommended
Battery-Powered Consumer Devices
The PIC16C58BT-40/SO powers rechargeable toothbrushes, electric shavers, handheld vacuums, and small kitchen gadgets. Its fully-static CMOS design supports clock-down to DC, reducing average current draw during idle periods - critical for battery-life optimization. The 8-bit timer with watchdog wakes the MCU on button press, runs the motor control loop at 40 MHz, and returns to sleep within microseconds. With 73 bytes RAM, the device holds battery state, mode selection, and a small run-time counter. The OTP memory prevents unauthorized firmware changes that could affect safety certifications - a key consideration for UL/CE-listed battery products. The SOIC-18 package handles moderate hand-soldering rework.
Recommended
Industrial Sensor Interfaces
The PIC16C58BT-40/SO suits 4-20 mA loop-powered sensor transmitters, simple PLC input modules, and discrete signal conditioners in factory automation. Its deterministic 8-bit RISC core delivers predictable response times without flash-memory read jitter - important for hard-real-time control loops. With 12 I/O, the device reads 8 digital inputs and drives 4 relay outputs, plus a serial line to a higher-level controller. The 40 MHz instruction rate handles biphase, Manchester, or Modbus RTU encoding without external UART hardware. Designers appreciate the wide 4.5-5.5 V supply tolerance for noisy 5 V industrial rails. The 3 KB OTP locks the calibration constants.
Recommended
Hobbyist and Educational Embedded Projects
The PIC16C58BT-40/SO remains popular in university embedded systems courses and hobbyist retro-computing projects. The PIC16C5X architecture is widely documented in textbooks, with simple instruction set allowing students to focus on fundamentals rather than complex peripherals. The 40 MHz clock provides enough headroom for teaching real-time scheduling, interrupt handling, and timer-based sub-cartes. The SOIC-18 package solders cleanly on breakout boards for breadboard prototyping, and the OTP variant forces good documentation practices. The Microchip MPLAB X IDE with MPASM assembler supports this legacy device at no cost, making it accessible for teaching. Students gain hands-on EPROM programming experience.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C58BT-40/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C58BT-04/SO | PIC16C58BT-20/SO | PIC16C58B-20E/SO | PIC16C58B-40/SS | PIC16C57CT-40/SO |
|---|---|---|---|---|---|---|
| Package | SOIC-18 (SO) 7.50 mm | SOIC-18 (SO) 7.50 mm - same | SOIC-18 (SO) 7.50 mm - same | SOIC-18 (SO) 7.50 mm - same | SSOP-20 (SS) 5.30 mm - different | SOIC-28 - different |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Maximum Clock Frequency | 40 MHz | 4 MHz | 20 MHz | 20 MHz | 40 MHz | 40 MHz |
| Program Memory | 3 KB OTP | 3 KB OTP | 3 KB OTP | 3 KB OTP | 3 KB OTP | 3 KB OTP |
| Data RAM | 73 bytes | 73 bytes | 73 bytes | 73 bytes | 73 bytes | 72 bytes |
| I/O Pins | 12 | 12 | 12 | 12 | 12 | 20 |
| Operating Temperature | 0 to +70 °C (Commercial) | 0 to +70 °C | 0 to +70 °C | -40 to +125 °C (Extended) | 0 to +70 °C | 0 to +70 °C |
| Supply Voltage | 4.5 to 5.5 V | 4.5 to 5.5 V | 4.5 to 5.5 V | 4.5 to 5.5 V | 4.5 to 5.5 V | 4.5 to 5.5 V |
Key Differentiators
- Largest OTP memory in PIC16C5X family (vs PIC16C54B / PIC16C55B / PIC16C56B)
- Highest speed grade available (vs PIC16C58BT-04/SO)
- OTP code protection (vs PIC16F18446)
- Fully-static CMOS architecture (vs PIC16C58BT-20/SO)
Design Notes
The PIC16C58BT-40/SO operates from a single 5 V supply (4.5-5.5 V) and is not a low-voltage part. Place a 0.1 µF ceramic decoupling capacitor close to the VDD pin (pin 18), with a 10 µF bulk capacitor on the same rail if the supply is shared with inductive loads. The Power-On Reset (POR) circuit requires the VDD rise time to be monotonic; add a 1 kΩ + 10 µF RC on /MCLR if the supply ramps slowly to guarantee a clean reset edge.
Layout the SOIC-18 footprint to standard IPC-7351 SOIC-7.50 mm dimensions (0.050 in / 1.27 mm pitch). Keep the OSC1/OSC2 traces short and surrounded by ground pour to reduce EMI susceptibility. Place the ICSP (In-Circuit Serial Programming) header even on production boards - although OTP cannot be erased in-circuit, ICSP still allows factory programming of the unprogrammed device through the same pins used by the application.
Do not confuse OTP-EPROM with flash: once programmed, the PIC16C58BT-40/SO cannot be electrically erased. Buy a /JW (windowed ceramic) variant for code development and verification, then program the /SO version for production. Be aware that the 'T' suffix in PIC16C58BT-40/SO indicates Tape and Reel packaging, NOT an 'I' (industrial) temperature grade - for industrial temperature ranges, choose PIC16C58B-20I/SO or PIC16C58B-20E/SO explicitly.
When driving RB0/INT as an interrupt source, ensure the signal is debounced in hardware with an RC filter (10 kΩ + 100 nF typical) to prevent multiple interrupts on a single mechanical bounce event. For clock signals above 20 MHz, use a 4-layer PCB with continuous ground plane to maintain signal integrity on OSC1/OSC2 traces. Avoid routing the oscillator traces near I/O switching lines - high dv/dt on RA or RB can inject noise into the oscillator and cause timing jitter.
Compliance Information
RoHS compliant per distributor listings as of 2026-09-17. Not AEC-Q100 qualified - choose PIC16C58B automotive-grade variants for vehicle applications. Lead-free SOIC packaging confirmed by Microchip ordering information.
