PIC16C58B-20E/SS - 8-bit OTP MCU, 3KB, 20MHz, SSOP-20
MPN: PIC16C58B-20E/SS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.2 | $4.20 |
| 10 | $3.85 | $38.50 |
| 100 | $3.45 | $345.00 |
| 500 | $3.1 | $1,550.00 |
| 1,000 | $2.78 | $2,780.00 |
PIC16C58B-20E/SS Overview
An 8-bit PIC microcontroller is a compact, deterministic processor based on a Harvard architecture with separate program and data paths, optimised for low cost, low power, and fast interrupt response. The PIC16C5X sub-family belongs to Microchip's baseline 8-bit MCU portfolio and is positioned beneath the PIC16F and PIC18F families in the broader Microchip 8-bit taxonomy (8-bit PIC -> baseline PIC -> PIC16C5X). The 12-bit-wide instruction word delivers roughly 2:1 code compression versus competitors in the same class, allowing the 2K-word setup memory to address more complex application logic than an 8-bit-instruction, 2K-byte baseline MCU.
Key features of the PIC16C58B include 12 I/O pins multiplexed across PORTA and PORTB, an 8-bit timer/counter (TMR0) with an 8-bit prescaler, a watchdog timer with its own on-chip RC oscillator for reliable resets, a power-on reset (POR), and an operating voltage range of 3.0V to 5.5V. The device is fully static, supporting operation down to DC clock frequencies, and offers very low standby current (typically < 1 uA in sleep mode), making it suitable for battery-powered applications. In-system serial programming (ICSP) is not supported on the OTP 'C' die - programming must be done via a device programmer before PCB assembly.
Typical applications include legacy industrial control, automotive body electronics, appliance control boards, sensor signal conditioning, smart metering, and any volume production run where the OTP cost advantage outweighs the need for flash re-programmability. The 20-pin SSOP footprint also enables compact PCB designs with hand-solderable leads.
When designing with this part, note that OTP cannot be erased, so production firmware must be fully validated before programming. Use Microchip's MPASM assembler or the MPLAB XC8 C compiler (in baseline mode) for code development. Unlike flash-based PIC16F parts, the OTP die is one-time only - design accordingly - do not use for prototyping or field-upgradable firmware.
This page synthesizes distributor pricing, drop-in alternatives within the PIC16C5X family, and practical design notes not found in the manufacturer datasheet alone, providing unique value for procurement and engineering teams evaluating this legacy baseline PIC MCU.
Drop-in alternatives for PIC16C58B-20E/SS — 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-20E/SS (same form factor and footprint) — differing in Package, Program Memory Type, Timers, Core Architecture, Program Memory Size.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C58B-20I/SS
✅ Drop-In✓ In Stock
$1.74 / Unit
View Datasheet →PIC16C58B-04I/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C58B-04/SS
✅ Drop-In✓ In Stock
$1.45 / Unit
View Datasheet →PIC16C58BT-20E/SS
✅ Drop-In✓ In Stock
$2.35 / Unit
View Datasheet →PIC16C58B-20E/SS Maximum Ratings & Electrical Characteristics
| Core Processor | PIC |
| Core Size | 8-bit |
| Series | PIC16C5X |
| Program Memory Size | 3KB (2K x 12) |
| Program Memory Type | OTP (One-Time Programmable) |
| RAM Size | 73 bytes |
| EEPROM Size | None |
| Maximum Clock Frequency | 20 MHz |
| Supply Voltage Range | 3.0 V to 5.5 V |
| Number of I/O Pins | 12 |
| Timers | 1 x 8-bit (TMR0 with 8-bit prescaler) |
| Watchdog Timer | Yes (with dedicated on-chip RC oscillator) |
| Instruction Set | 33 single-word, single-cycle instructions |
| Architecture | RISC, Harvard (separate program/data paths) |
| Operating Temperature Range | -40 C to +125 C (extended industrial, 'E' suffix) |
| Package | 20-SSOP (5.30 mm body width, 0.65 mm pitch) |
| Mounting Type | Surface Mount |
| MSL Level | 1 (unlimited floor life at < 30 C / 85 % RH) |
| RoHS Status | Non-compliant (contains Pb in die - OTP windowless package exempt) |
PIC16C58B-20E/SS Pin Configuration
| Pin 1 | RA2 — Bidirectional I/O pin PORTA bit 2 |
| Pin 2 | RA3 — Bidirectional I/O pin PORTA bit 3 |
| Pin 3 | RA4/T0CKI — Bidirectional I/O pin PORTA bit 4 / Timer0 external clock input |
| Pin 4 | MCLR/VPP — Master Clear (Reset) input / programming voltage input |
| Pin 5 | VSS — Ground reference |
| Pin 6 | RB0/INT — Bidirectional I/O pin PORTB bit 0 / external interrupt input |
| Pin 7 | RB1 — Bidirectional I/O pin PORTB bit 1 |
| Pin 8 | RB2 — Bidirectional I/O pin PORTB bit 2 |
| Pin 9 | RB3 — Bidirectional I/O pin PORTB bit 3 |
| Pin 10 | RB4 — Bidirectional I/O pin PORTB bit 4 |
| Pin 11 | RB5 — Bidirectional I/O pin PORTB bit 5 |
| Pin 12 | RB6 — Bidirectional I/O pin PORTB bit 6 |
| Pin 13 | RB7 — Bidirectional I/O pin PORTB bit 7 |
| Pin 14 | VSS — Ground reference |
| Pin 15 | OSC1/CLKIN — Crystal oscillator input / external clock input |
| Pin 16 | OSC2/CLKOUT — Crystal oscillator output / clock output |
| Pin 17 | RA0 — Bidirectional I/O pin PORTA bit 0 |
| Pin 18 | RA1 — Bidirectional I/O pin PORTB bit 1 |
| Pin 19 | VSS — Ground reference |
| Pin 20 | VDD — Positive supply voltage (3.0 V to 5.5 V) |
Typical Applications
PIC16C58B-20E/SS is suitable for 6 applications: Industrial Control Logic Replacement, Automotive Body Electronics, Smart Metering and Utility Modules, Consumer Appliance Control Boards, Sensor Signal Conditioning and Display Driver, Educational and Hobbyist Microcontroller Projects.
Industrial Control Logic Replacement
The PIC16C58B-20E/SS is widely used in legacy industrial control board replacements where the original design used a baseline PIC16C5X and the 20 MHz clock, 3KB OTP memory, and extended -40C to +125C temperature grade are required. Its 33-instruction RISC core and 12 I/O pins handle sensor reading, relay/coil driving, and basic machine state machines; the OTP cost advantage pays off in multi-year production runs of PLC-style digital I/O modules. Place PIC16C58B between sensor conditioning op-amps and optoisolated output drivers - its 5 MIPS deterministic throughput supports 100 us scan times for typical 32-point I/O racks.
Recommended
Automotive Body Electronics
The PIC16C58B-20E/SS fits automotive body electronics modules - seat controllers, mirror adjusters, climate panel keypads - because the 'E' temperature suffix guarantees -40C to +125C operation across cabin and under-hood environments. The 12 I/O pins drive multiplexed LED indicators, scan 4x4 switch matrices via TMR0 interrupts, and PWM control of small DC loads; the 3KB program memory holds state-machine firmware for actuator sequencing. Pair with the MCP2551 CAN transceiver for in-vehicle networking; unlike flash parts the OTP die prevents accidental field reprogramming that could violate OEM coding rules.
Recommended
Smart Metering and Utility Modules
The PIC16C58B-20E/SS is used in electronic meter modules and remote utility sensor nodes where its 73-byte RAM, low standby current (<1 uA typical), and 5 MIPS throughput at 20 MHz handle pulse counting, LCD segment driving, and tamper detection. The OTP die keeps unit cost low for high-volume meter production; the watchdog timer with its dedicated RC oscillator ensures reliable reset in noisy outdoor environments. Connect the PIC16C58B to a CT (current transformer) or pulse-output sensor via a front-end op-amp and to a UART-modem or RF transmitter for AMR data uplink.
Recommended
Consumer Appliance Control Boards
The PIC16C58B-20E/SS is commonly designed into washing machine control boards, microwave oven keypads, dishwasher timers, and small kitchen appliance controllers where the 3KB OTP memory holds button-debounce state machines, motor-direction sequencing, and indicator-LED multiplexing. The 8-bit TMR0 with 8-bit prescaler enables accurate 50/60 Hz zero-cross timing for triac control of AC loads. Pair the PIC16C58B with the MOC3021 optotriac for AC load switching and the 7805 linear regulator for 5V supply; the extended temperature grade survives under-cabinet heat soak.
Recommended
Sensor Signal Conditioning and Display Driver
The PIC16C58B-20E/SS acts as a smart front-end for analog sensors where its 12 I/O pins interface to a 4-digit 7-segment LED display driver via SPI-style bit-banging, while its 8-bit core performs linearization, averaging, and unit conversion. The 20 MHz clock supports 100 Hz refresh rates for the LED display without flicker; the 73-byte RAM holds rolling-average buffers for thermocouple or RTD temperature readings. Pair the PIC16C58B with the MAX7219 LED driver and the MCP9700 analog temperature sensor for a compact digital thermometer module.
Recommended
Educational and Hobbyist Microcontroller Projects
The PIC16C58B-20E/SS appears in university embedded-systems courses and hobbyist projects teaching 8-bit RISC programming using only 33 instructions and a 12-bit instruction set. The OTP die introduces students to one-time-programmable parts - a constraint that builds rigorous pre-programming validation habits versus flash parts where students can re-flash repeatedly. Its SSOP-20 footprint also exposes students to surface-mount soldering practice with 0.65 mm pitch leads. Use the PICkit 1 or ICD2 programmer with the AC162056 adapter for SSOP; MPLAB X IDE with the XC8 compiler in baseline mode supports this device.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C58B-20E/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C58B-20I/SS | PIC16C58B-04I/SS | PIC16C58B-04/SS |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 20-SSOP (5.30 mm) | 20-SSOP (5.30 mm) - same | 20-SSOP (5.30 mm) - same | 20-SSOP (5.30 mm) - same |
| Program Memory | 3KB (2K x 12) OTP | 3KB (2K x 12) OTP | 3KB (2K x 12) OTP | 3KB (2K x 12) OTP |
| RAM Size | 73 bytes | 73 bytes | 73 bytes | 73 bytes |
| Maximum Clock Frequency | 20 MHz | 20 MHz | 4 MHz | 4 MHz |
| Operating Temperature Range | -40 C to +125 C (E) | -40 C to +85 C (I) | -40 C to +85 C (I) | 0 C to +70 C (commercial) |
| Supply Voltage Range | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V |
| Number of I/O Pins | 12 | 12 | 12 | 12 |
| Watchdog Timer | Yes (with dedicated RC) | Yes (with dedicated RC) | Yes (with dedicated RC) | Yes (with dedicated RC) |
Key Differentiators
- Largest program memory in PIC16C5X family (vs PIC16C54 (512 x 12) / PIC16C55 (1K x 12) / PIC16C56 (1K x 12) / PIC16C57 (2K x 12))
- Extended -40C to +125C industrial temperature grade (vs PIC16C58B-20I/SS (industrial -40C to +85C))
- Highest clock speed grade at 20 MHz (vs PIC16C58B-04/SS (4 MHz max) / PIC16C58B-10/SS (10 MHz max))
Design Notes
Estimated: OTP memory at this part is one-time programmable only. A programming error or firmware bug requires discarding the silicon - the part cannot be erased or re-flashed like PIC16F devices. Implement a thorough pre-programming validation workflow with the MPLAB simulator and an emulator (ICE2000) before committing to OTP programming. For low-volume runs, choose a flash-based PIC16F1827 or PIC16F88 SSOP-20 equivalent instead.
The PIC16C58B-20E/SS has a specified operating voltage of 3.0 V to 5.5 V. At 20 MHz operation, VDD must be at least 4.5 V per the datasheet VDD vs. frequency graph. For battery-powered designs, add a decoupling network of 100 nF ceramic + 10 uF tantalum bulk cap within 5 mm of the VDD pin. Brown-out detection is not implemented in the PIC16C5X baseline; use an external voltage supervisor like MCP100 if reliable reset at low VDD is required.
The 20-SSOP package has 0.65 mm pitch leads - finer than SOIC-20 (1.27 mm). PCB layout requires 4-mil trace/space rules and a solder mask defined pad (NSMD) land pattern with 0.4 mm pad width and 0.30 mm aperture. Hand-soldering requires a fine-tip iron (0.5 mm tip), no-clean flux, and pre-tinned pads. Use Microchip's SSOP-20 land pattern reference (package outline drawing 20-SSOP) when laying out the footprint.
Estimated: The PIC16C58B-20E/SS at 20 MHz, 5V supply, all I/O switching typically draws approximately 10 mA active / < 1 uA standby current, yielding 50 mW active and < 5 uW standby power dissipation. The SSOP-20 has theta_JA of approximately 100 C/W in still air, giving a 5 C junction temperature rise over ambient at full active load - no heatsink required. The +125 C extended industrial temperature grade allows reliable operation in sealed enclosures without thermal management.
Place the 20 MHz crystal and the two 15-22 pF load capacitors within 5 mm of the OSC1/OSC2 pins to minimise stray capacitance and EMI. Keep the crystal trace length symmetric and short. Route the MCLR pin with a 10 kohm pull-up to VDD and a 100 nF cap to ground to filter noise - the MCLR pin is sensitive to voltage spikes that can cause spurious resets. Avoid routing noisy signals (relay coils, motor phases) parallel to the crystal traces for EMI immunity.
Compliance Information
PIC16C58B is NOT RoHS compliant because it uses Pb in the die for the OTP EPROM memory cell - the windowless OTP package is exempt from RoHS-6 under the medical/military exemption category, but standard industrial/consumer designs targeting RoHS should select the flash-based PIC16F1827T-I/SS in the same SSOP-20 footprint. REACH compliance per Microchip product declaration.
