PIC16C58BT-20I/SS - 8-Bit 20MHz 3KB OTP MCU | Microchip | SSOP-20
MPN: PIC16C58BT-20I/SS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.95 | $2.95 |
| 10 | $2.65 | $26.50 |
| 100 | $2.35 | $235.00 |
| 500 | $2.1 | $1,050.00 |
| 1,000 | $1.85 | $1,850.00 |
PIC16C58BT-20I/SS Overview
What is a PIC16C5x microcontroller? The PIC16C5x family from Microchip Technology is a line of low-cost, high-performance, 8-bit fully static, EPROM/ROM-based CMOS microcontrollers that use a RISC architecture. It belongs to the broader category of microcontrollers (MCUs) within embedded processors, characterized by 12-bit wide instructions that provide 2:1 code compression over other 8-bit MCUs in its class. These devices target simple control tasks where deterministic execution and minimal external components are required.
Key features include 33 single-word instructions, 2:1 code compression via 12-bit-wide opcodes, a wide operating voltage range of 3.0V to 5.5V, 12 CMOS bidirectional I/O pins, and an industrial temperature rating of -40C to +85C. The OTP EPROM memory enables rapid prototyping without mask charges, while the -20 speed grade guarantees 20 MHz operation across the full voltage and temperature range.
The device employs a Harvard architecture with separate program and data buses, a two-stage pipeline, and a built-in oscillator that supports crystal, ceramic resonator, or external clock inputs. With only 33 instructions and a fixed reset vector, the PIC16C5x delivers deterministic interrupt-free operation suitable for hard real-time control loops.
Typical applications include industrial automation sensors, consumer appliance controllers, simple motor control, battery chargers, security keypads, and low-cost IoT edge nodes. The wide 3V to 5.5V range allows direct operation from a single lithium cell or a 5V regulated rail.
When designing with this MCU, note that OTP memory cannot be reprogrammed, so production code must be fully validated before programming. The 12-bit instruction width and lack of interrupts require firmware planning, but the small footprint and minimal external components make it ideal for volume-sensitive designs.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for PIC16C58BT-20I/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 PIC16C58BT-20I/SS (same form factor and footprint) — differing in Package, Mounting Type, Program Memory Type, Core Architecture, Instruction Set.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C58B-20I/SS
✅ Drop-In✓ In Stock
$1.74 / Unit
View Datasheet →PIC16C58BT-20/SS
✅ Drop-In✓ In Stock
$1.39 / Unit
View Datasheet →PIC16C58BT-04I/SS
✅ Drop-In✓ In Stock
$2.65 / Unit
View Datasheet →PIC16C58BT-04/SS
✅ Drop-In✓ In Stock
$1.62 / Unit
View Datasheet →PIC16C58B-20I/P
✅ Drop-In✓ In Stock
$1.55 / Unit
View Datasheet →PIC16C58BT-20I/SS Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC16C5x RISC, 8-bit |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 3 KB (2K x 12) |
| RAM Size | 73 bytes |
| Number of I/O Pins | 12 |
| Maximum Clock Frequency | 20 MHz |
| Operating Voltage Range | 3.0 V to 5.5 V |
| Operating Temperature Range | -40 C to +85 C (Industrial) |
| Package | 20-SSOP (0.209 inch / 5.30 mm width) |
| Mounting Type | Surface Mount |
| Instruction Set | 33 single-word instructions |
| Instruction Width | 12 bits |
| Data EEPROM | Not available |
| ADC | Not available |
| Speed Grade | -20 (20 MHz) |
| RoHS Status | Compliant |
| MSL Level | 1 (unlimited floor life at 30C/85% RH) |
PIC16C58BT-20I/SS Pin Configuration
| Pin 1 | RA2 — Bidirectional I/O port A bit 2 |
| Pin 2 | RA3 — Bidirectional I/O port A bit 3 |
| Pin 3 | RB0 — Bidirectional I/O port B bit 0 |
| Pin 4 | RB1 — Bidirectional I/O port B bit 1 |
| Pin 5 | RB2 — Bidirectional I/O port B bit 2 |
| Pin 6 | RB3 — Bidirectional I/O port B bit 3 |
| Pin 7 | RB4 — Bidirectional I/O port B bit 4 |
| Pin 8 | RB5 — Bidirectional I/O port B bit 5 |
| Pin 9 | RB6 — Bidirectional I/O port B bit 6 |
| Pin 10 | RB7 — Bidirectional I/O port B bit 7 |
| Pin 11 | VDD — Positive supply voltage (3.0V to 5.5V) |
| Pin 12 | VSS — Ground reference |
| Pin 13 | OSC2 — Oscillator output / CLKOUT |
| Pin 14 | OSC1 — Oscillator input / CLKIN |
| Pin 15 | MCLR — Master Clear reset input (active low) |
| Pin 16 | NC — Not connected (per datasheet) |
| Pin 17 | NC — Not connected (per datasheet) |
| Pin 18 | RA0 — Bidirectional I/O port A bit 0 |
| Pin 19 | RA1 — Bidirectional I/O port A bit 1 |
| Pin 20 | NC — Not connected (per datasheet) |
Typical Applications
PIC16C58BT-20I/SS is suitable for 6 applications: Industrial Automation Sensor Controllers, Consumer Appliance Controllers, Simple Motor Control (Brushed DC, Stepper), Battery Chargers and Power Management Front Ends, Security Keypads and Access Control Panels, LED Display and Indicator Controllers.
Industrial Automation Sensor Controllers
The PIC16C58BT-20I/SS suits industrial sensor nodes that require deterministic 8-bit control in a compact SSOP-20 footprint. Its 20 MHz clock and 33-instruction RISC core execute simple closed-loop control (PID-lite, threshold detection, hysteresis) within tight microsecond budgets, while the 12 I/O pins accommodate multiple digital sensors, relay drivers, and indicator LEDs. The 3.0V to 5.5V supply range accepts both 3.3V and 5V rails commonly found in factory PLC backplanes. According to Microchip application notes for the PIC16C5x family, the industrial -40C to +85C temperature range supports cabinet-mounted operation without derating.
Recommended
Consumer Appliance Controllers
In consumer appliances such as coffee makers, microwave ovens, washing machines, and rice cookers, the PIC16C58BT-20I/SS handles user input scanning (buttons, rotary encoders), display driving (LED or low-segment LCD), and actuator timing (relays, triacs, valves). Its 3 KB OTP program memory stores menu logic, error codes, and timing profiles, while 73 bytes of RAM is sufficient for state machines and debounce buffers. The 20 MHz instruction throughput (5 MHz instruction rate, 200 ns cycle) keeps relay latency under 1 ms. Volume pricing around $1.85 at qty 1,000 keeps the BOM low for mass-market white goods.
Recommended
Simple Motor Control (Brushed DC, Stepper)
For low-cost brushed DC and unipolar stepper motor control, the PIC16C58BT-20I/SS provides sufficient GPIO and timing precision to implement PWM speed control, direction switching, and acceleration ramps in software. Its 200 ns instruction cycle allows 8-bit PWM at 20 kHz without external timers, and the 12 I/O pins can drive a half H-bridge with direction and brake lines plus enable and fault inputs. The SSOP-20 package fits on small motor-control PCBs alongside MOSFET gate drivers. Per the Microchip PIC16C5x family datasheet, the OTP memory holds motor profile tables and startup routines with no field-upgrade requirement.
Recommended
Battery Chargers and Power Management Front Ends
The PIC16C58BT-20I/SS can act as a charger controller in single-cell lithium-ion or NiMH charging circuits, monitoring voltage dividers from the battery and toggling charge FETs via its GPIO. With 12 I/O pins, the MCU reads cell voltage, temperature thermistor, charge current sense, and indicator LEDs, while 3 KB OTP holds the CC-CV algorithm and safety timeouts. The 3.0V to 5.5V operating range accepts both USB 5V and single-cell battery inputs. Its wide -40C to +85C rating handles ambient variations in consumer charging cradles and industrial charging stations.
Recommended
Security Keypads and Access Control Panels
The PIC16C58BT-20I/SS powers matrix-scanned PIN keypads for alarm panels, garage door openers, and electronic locks. Its 12 I/O pins directly drive a 4x4 keypad matrix (4 rows + 4 columns) with 8 pins, leaving 4 spare for LED status, buzzer, relay output, and a tamper switch input. The 20 MHz clock debounces keypresses in firmware without external capacitors, while the OTP memory locks the access code table to prevent code extraction. The SSOP-20 footprint fits behind a slim keypad bezel alongside a piezo buzzer and MOSFET-driven relay.
Recommended
LED Display and Indicator Controllers
For 7-segment or dot-matrix LED driver panels in appliance front panels, scoreboards, and signage, the PIC16C58BT-20I/SS multiplexes digits via charlieplexed or scanned outputs. The 20 MHz instruction cycle supports multiplex refresh rates above 100 Hz, eliminating visible flicker, while 73 bytes RAM holds display buffer and animation state. The 3 KB OTP program memory stores character fonts, scrolling messages, and brightness curves. Operating from 3.0V to 5.5V, the MCU directly drives low-current LED arrays via its CMOS outputs, with external transistors for higher-current digit common lines.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C58BT-20I/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C58B-20I/SS | PIC16C58BT-20/SS | PIC16C58BT-04I/SS | PIC16C58BT-04/SS | PIC16C58B-20I/P |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 20-SSOP (5.30 mm) | 20-SSOP - same | 20-SSOP - same | 20-SSOP - same | 20-SSOP - same | PDIP-20 (through-hole) |
| Maximum Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 4 MHz | 4 MHz | 20 MHz |
| Program Memory (OTP EPROM) | 3 KB (2K x 12) | 3 KB | 3 KB | 3 KB | 3 KB | 3 KB |
| RAM Size | 73 bytes | 73 bytes | 73 bytes | 73 bytes | 73 bytes | 73 bytes |
| I/O Pins | 12 | 12 | 12 | 12 | 12 | 12 |
| Operating Voltage | 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 | 3.0 V to 5.5 V | 3.0 V to 5.5 V |
| Temperature Range | -40 C to +85 C (Industrial) | -40 C to +85 C | 0 C to +70 C (Commercial) | -40 C to +85 C | 0 C to +70 C (Commercial) | -40 C to +85 C |
| Packaging Carrier | Tape & Reel | Tube | Tape & Reel | Tape & Reel | Tape & Reel | Tube |
Key Differentiators
- Industrial temperature rating (-40C to +85C) (vs PIC16C58BT-20/SS)
- 20 MHz maximum clock speed (vs PIC16C58BT-04I/SS)
- Tape-and-reel packaging for SMT production (vs PIC16C58B-20I/SS)
- Compact SSOP-20 footprint (5.30 mm body) (vs PIC16C58B-20I/P)
Design Notes
The PIC16C58BT-20I/SS in SSOP-20 requires careful thermal pad and trace layout. Place a decoupling capacitor (100 nF ceramic) within 3 mm of the VDD pin (pin 11) and a bulk capacitor (10 uF tantalum or aluminum polymer) within 10 mm. The MCLR pin (pin 15) needs a 10 kohm pull-up to VDD and a 100 nF capacitor to ground for noise immunity; without this, spurious resets can occur in noisy industrial environments. Keep the OSC1/OSC2 traces short and surrounded by a ground guard ring to minimize EMI pickup.
OTP EPROM is one-time programmable - code cannot be erased or rewritten. Per the Microchip PIC16C5x datasheet (DS30400D), production code must be fully validated before programming the final units. Developers should use the PIC16C58B JW windowed ceramic package or a PIC16F57-I/SS Flash equivalent for prototyping. Additionally, the PIC16C5x family lacks interrupts - all timing must be implemented via polling loops with calculated cycle counts. At 20 MHz oscillator (200 ns instruction cycle), a single NOP takes one cycle, so a 100 us delay requires 500 NOPs or a counted loop.
The PIC16C58BT-20I/SS typically draws 2 to 5 mA active at 5V/20 MHz depending on output loading, with standby currents in the microamp range when the oscillator is halted. For battery-powered designs, gate the oscillator via an external logic gate or disable the MCU via a load switch on VDD. The 3.0V minimum supply allows direct operation from two alkaline cells (nominally 3.0V end-of-life), but brown-out detection is not built in - implement external voltage monitoring via a voltage divider into an unused GPIO if low-battery lockout is required.
The SSOP-20 (5.30 mm body width) has 0.65 mm lead pitch, which demands fine-pitch PCB assembly. Per Microchip SSOP package guidelines, the recommended land pattern uses 0.40 mm wide pads with 0.30 mm solder mask slivers. Use a reflow profile with peak temperature 245C to 250C for lead-free SAC305 solder. For hand prototyping or low-volume assembly, the PIC16C58B-20/P PDIP-20 variant uses the same die and is far easier to solder, though it occupies roughly 4x more PCB area.
Compliance Information
RoHS compliance confirmed by Microchip product page; REACH status inferred from distributor listings. Not AEC-Q100 qualified - select automotive-grade PIC16 variants for vehicular applications. Halogen-free status not explicitly stated in available data.
