PIC16C58BT-04/SS - 8-Bit 4MHz OTP MCU 3KB 20-SSOP | Microchip
MPN: PIC16C58BT-04/SS ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.42 | $3.42 |
| 10 | $2.95 | $29.50 |
| 100 | $2.4 | $240.00 |
| 500 | $1.95 | $975.00 |
| 1,000 | $1.62 | $1,620.00 |
PIC16C58BT-04/SS Overview
A microcontroller (MCU) is a single-chip computer containing a processor core, program memory, working RAM, and programmable I/O peripherals. The PIC16C5x family is the original baseline of Microchip's PIC architecture, employing a Harvard RISC design with a 12-bit instruction word. These OTP MCUs target cost-sensitive, fixed-function embedded products where firmware is finalized at production time and field updates are not required.
Key features include 12 I/O pins, a 2-level hardware stack, a watchdog timer for reliability, an 8-bit timer/counter, and an operating voltage range of 3.0V to 5.5V. The device supports internal RC oscillator modes plus external crystal/resonator, simplifying BOM cost by eliminating external clock components in space-constrained designs. Its commercial temperature grade (0°C to +70°C) makes it suitable for indoor consumer and office equipment.
The PIC16C58B uses a 12-bit instruction set inherited from the original PIC16C5x baseline architecture. With only 33 single-cycle instructions and a 2-level deep hardware stack, it is optimized for simple state-machine replacement rather than complex multitasking. The OTP memory programming model requires a dedicated device programmer, and code security is enforced via a single protection fuse.
Typical applications include remote controls, low-end appliance controllers, LED lighting controllers, simple sensor interfaces, and battery-powered consumer gadgets. The 4 MHz internal operation provides sufficient throughput for slow user-interface tasks while keeping active current low.
When designing with this device, allocate sufficient board area for the SSOP-20 footprint and ensure the programming header is accessible during production. Note that the OTP variant cannot be re-programmed in-circuit - design with a socket-friendly land pattern if firmware iteration is anticipated during development.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet. All parameters and pricing reflect publicly available data from authorized distributors as of 2026-09-17.
Drop-in alternatives for PIC16C58BT-04/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-04/SS (same form factor and footprint) — differing in Package, Program Memory Type, MSL Level, Core Architecture, Instruction Set.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C58B-04/SS
✅ Drop-In✓ In Stock
$1.45 / Unit
View Datasheet →PIC16C58B-20E/SS
✅ Drop-In✓ In Stock
$2.78 / Unit
View Datasheet →PIC16C58B-40/SS
✅ Drop-In✓ In Stock
$0.72 / Unit
View Datasheet →PIC16F57-I/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C58BT-04/SS Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit PIC RISC |
| Instruction Set Width | 12-bit |
| Maximum Clock Frequency | 4 MHz |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 3 KB (2K x 12) |
| RAM Size | 73 bytes |
| Number of I/O Pins | 12 |
| Supply Voltage Range | 3.0 V to 5.5 V |
| Operating Temperature Range | 0 °C to +70 °C (Commercial) |
| Package | 20-SSOP (Shrink Small Outline Package, 5.30 mm body) |
| Mounting Type | Surface Mount (Gull Wing) |
| Number of Terminals | 20 |
| Package Code | SSOP |
| Temperature Grade | Commercial |
| Oscillator Type | External Crystal/Resonator or Internal RC |
PIC16C58BT-04/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 | RTCC — Real-time clock/counter input (schmitt trigger) |
| Pin 4 | MCLR — Master clear reset input (active low) |
| Pin 5 | VSS — Ground reference |
| Pin 6 | RB0 — Bidirectional I/O port B bit 0 |
| Pin 7 | RB1 — Bidirectional I/O port B bit 1 |
| Pin 8 | RB2 — Bidirectional I/O port B bit 2 |
| Pin 9 | RB3 — Bidirectional I/O port B bit 3 |
| Pin 10 | RB4 — Bidirectional I/O port B bit 4 |
| Pin 11 | RB5 — Bidirectional I/O port B bit 5 |
| Pin 12 | RB6 — Bidirectional I/O port B bit 6 |
| Pin 13 | RB7 — Bidirectional I/O port B bit 7 |
| Pin 14 | VDD — Positive supply voltage |
| Pin 15 | OSC2 — Oscillator output / Fosc/4 clock output |
| Pin 16 | OSC1 — Oscillator input / external clock input |
| Pin 17 | RA0 — Bidirectional I/O port A bit 0 |
| Pin 18 | RA1 — Bidirectional I/O port A bit 1 |
| Pin 19 | T0CKI — Timer 0 clock input (schmitt trigger) |
| Pin 20 | NC — Not connected (per datasheet) |
Typical Applications
PIC16C58BT-04/SS is suitable for 6 applications: Remote Control Handheld Devices, Low-End Appliance Controllers, LED Lighting Pattern Controllers, Simple Sensor Interface Hubs, Battery-Powered Consumer Gadgets, Industrial Control State-Machine Replacement.
Remote Control Handheld Devices
The PIC16C58BT-04/SS fits remote control applications because its 4 MHz baseline core, 12 I/O pins, and 3 KB OTP memory are sufficient for IR protocol encoding, button matrix scanning, and low-power sleep duty cycling. The OTP memory locks firmware at production, preventing reverse engineering of proprietary IR codes - a security advantage over flash parts. With 3.0-5.5 V supply range, the device runs directly from two AA alkaline cells via a simple regulator. Per the Microchip datasheet, the 12-bit instruction set executes single-cycle instructions in 1 µs at 4 MHz, fast enough for NEC, RC5, and Sony SIRC protocol generation without timing jitter.
Recommended
Low-End Appliance Controllers
The PIC16C58BT-04/SS suits appliance controllers such as small fans, coffee makers, and toasters because its 12 I/O pins can drive seven-segment displays, relay coils, and triac interfaces directly via current-limited pins. The OTP memory locks UL/CE-compliant firmware at production, preventing field tampering. The 3.0-5.5 V supply aligns with rectified mains-derived rails typical in small appliances. According to the Microchip datasheet, the watchdog timer and brown-out reset provide the reliability required for unattended mains-connected equipment under IEC 60335 safety standards.
Recommended
LED Lighting Pattern Controllers
The PIC16C58BT-04/SS fits LED lighting controllers because its 4 MHz clock provides sufficient PWM resolution for decorative color-mixing and chasing patterns, while its 73 bytes of RAM holds current frame state. The 12 I/O pins can source/sink LED channels via constant-current drivers, and the OTP memory secures proprietary lighting sequences from copying. The commercial 0-70°C temperature range covers indoor luminaires. Per the datasheet, the timer/counter can drive hardware PWM at 4 kHz, eliminating flicker in RGB strips and architectural fixtures.
Recommended
Simple Sensor Interface Hubs
The PIC16C58BT-04/SS works as a sensor interface hub for low-rate analog and digital sensors because its 12-bit instruction set executes ADC-free firmware loops in 1 µs, adequate for thermistor resistance-to-temperature conversion or Hall-effect pulse counting. The 3 KB OTP memory fits small lookup tables for sensor linearization. The 3.0-5.5 V supply matches battery and bus-powered sensor nodes. According to Microchip, the internal RC oscillator eliminates external crystal cost in disposable sensor tags.
Recommended
Battery-Powered Consumer Gadgets
The PIC16C58BT-04/SS suits battery-powered gadgets such as electronic gifts, novelty toys, and kitchen timers because its baseline architecture draws under 2 mA active at 4 MHz and supports sleep modes below 10 µA. The 3.0-5.5 V range allows direct operation from CR2032 or two-AA cells. The OTP memory locks BOM-cost-optimized firmware that cannot be accidentally erased. Per Microchip, the watchdog timer prevents hang-ups in unattended battery devices extending shelf life.
Recommended
Industrial Control State-Machine Replacement
The PIC16C58BT-04/SS fits industrial state-machine replacement applications such as conveyor diverters, simple valve actuators, and counter/timer modules where reliability and OTP security matter more than flash reprogrammability. The 4 MHz core executes deterministic state transitions in microseconds, the watchdog timer guards against EMI-induced lockups, and the commercial temperature grade covers control cabinet environments. The 3 KB OTP holds complete ladder-logic-equivalent firmware. According to the datasheet, the 12 I/O pins map cleanly to a 4x3 keypad or 7-segment plus 4-digit BCD interface.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C58BT-04/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C58B-04/SS | PIC16C58B-20E/SS | PIC16C58B-40/SS | PIC16F57-I/SS |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 20-SSOP | 20-SSOP - same | 20-SSOP - same | 20-SSOP - same | 20-SSOP - same |
| Maximum Clock Frequency | 4 MHz | 4 MHz | 20 MHz | 40 MHz | 20 MHz |
| Program Memory Type | OTP | OTP | OTP | OTP | Flash |
| Program Memory Size | 3 KB (2K x 12) | 3 KB | 3 KB | 3 KB | 3 KB |
| RAM Size | 73 bytes | 73 bytes | 73 bytes | 73 bytes | 73 bytes |
| Number of I/O Pins | 12 | 12 | 12 | 12 | 20 |
| Operating 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 | 2.0 V to 5.5 V |
Key Differentiators
- 12-bit baseline PIC architecture - smallest instruction set footprint (vs PIC16F57-I/SS)
- OTP memory provides firmware security against reverse engineering (vs PIC16F57-I/SS)
- Higher maximum clock speed grade available in same SSOP-20 package (vs PIC16C58B-40/SS)
Design Notes
Decouple VDD with a 100 nF ceramic capacitor placed within 5 mm of pin 14, plus a 10 µF tantalum bulk capacitor at the board supply entry. The PIC16C58BT-04/SS draws approximately 2 mA active at 4 MHz and 5 V; sleep current is below 10 µA. For battery applications, switch to the watchdog-based sleep with internal RC oscillator to minimize quiescent draw. Avoid placing the decoupling cap on the VDD pin shared with analog reference if used.
Do not assume the MCLR pin (pin 4) can be left floating - it requires a 10 kΩ pull-up to VDD for reliable operation. The OTP memory is one-time programmable: a programming error or wrong firmware version bricks the part permanently. Design the PCB with an ICSP header footprint reserved, even if production units are pre-programmed. The 2-level hardware stack supports only 2 nested CALLs; deeply nested subroutines will corrupt the return address - keep call depth to 1.
The 20-SSOP package has a 0.65 mm pitch with a 5.30 mm body width and 1.75 mm maximum height. Recommended PCB pad dimensions are 0.45 mm wide by 0.4 mm long, with a 0.30 mm solder mask expansion. Route all 12 I/O traces on the outer layer with the SSOP placed perpendicular to the board edge to ease hand-soldering rework. For production, the recommended reflow profile follows JEDEC J-STD-020 with peak temperature of 260°C for no more than 20-40 seconds above 245°C.
Compliance Information
RoHS and REACH compliant per Microchip product environmental documentation. Lead-free matte-tin finish. Not AEC-Q100 qualified - not suitable for automotive applications. Halogen-free per JESD709 standard.
