PIC16C58BT-20/SS - 8-Bit 20MHz 3KB OTP MCU | Microchip | SSOP-20
MPN: PIC16C58BT-20/SS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.45 | $2.45 |
| 10 | $2.18 | $21.80 |
| 100 | $1.85 | $185.00 |
| 500 | $1.62 | $810.00 |
| 1,000 | $1.39 | $1,390.00 |
PIC16C58BT-20/SS Overview
A microcontroller is a single-chip computer that integrates a CPU, program memory, working RAM, and peripheral I/O on one die. The 8-bit class targets cost-sensitive embedded control where deterministic timing and low power are valued over raw throughput; within that class the PIC16C5X family occupies the baseline tier, optimized for the smallest possible code size (12-bit instruction word) and the lowest unit cost. PIC microcontrollers sit inside the broader semiconductor hierarchy: MCU -> embedded processor -> digital IC -> semiconductor.
Key features include 12 general-purpose digital I/O pins, an external oscillator interface (RC, XT, HS, LP modes), Power-On Reset (POR), Watchdog Timer (WDT), and a 3-deep hardware stack. The OTP memory allows one-time user programming for low-volume production, and the CMOS static design supports operation down to DC clock speeds. The 20-SSOP package offers a compact 0.65mm pitch footprint.
Architecturally, the PIC16C58B uses a Harvard architecture with separate program and data buses, a 12-bit instruction word for code density, and a fully static core. The device has no integrated ADC, PWM, UART, or I2C peripherals, so connectivity is handled in software via bit-banged I/O. Power consumption is intrinsically low because unused peripherals draw zero current on the static CMOS design.
Typical applications include low-cost consumer appliances, LED lighting controllers, remote-control transmitters, battery chargers, simple sensor interfaces, and industrial timers. The PIC16C58B is well suited to high-volume price-sensitive designs where on-chip analog and communication peripherals are not required.
When designing with this part, plan for an external oscillator (crystal, ceramic resonator, or RC network) and provide proper decoupling (100 nF plus 10 uF bulk) near the VDD pins. Use the WDT and POR features to recover from software lockups. Note that OTP memory cannot be reprogrammed; for prototyping use the JW or windowed package.
This page synthesizes distributor pricing, parameter comparison against drop-in alternatives in the same SSOP-20 footprint, and practical design notes that go beyond the manufacturer datasheet summary.
Drop-in alternatives for PIC16C58BT-20/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-20/SS (same form factor and footprint) — differing in Package, Program Memory Type, Core Architecture, Operating Temperature, Timers.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C58B-20/SS
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
PIC16C58B-20I/SS
✅ Drop-In✓ In Stock
$1.74 / Unit
View Datasheet →PIC16C58B-20E/SS
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$2.78 / 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 →PIC16C57-XT/SS
✅ Drop-In✓ In Stock
$1.28 / Unit
View Datasheet →PIC16C58BT-20/SS Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit RISC (Harvard) |
| Instruction Set | PIC16C5X baseline, 12-bit instruction word |
| Program Memory | 3 KB (2K x 12) OTP |
| RAM | 73 bytes |
| Maximum CPU Frequency | 20 MHz |
| Instruction Cycle Time | 200 ns (4 clock periods) |
| I/O Pins | 12 general-purpose digital |
| Timers | 1 x 8-bit RTCC (no WDT-as-timer) |
| Watchdog Timer (WDT) | Yes, independent on-chip RC oscillator |
| Reset Sources | POR, MCLR, WDT timeout |
| Supply Voltage (VDD) | 2.5 V to 5.5 V |
| Oscillator Modes | RC, XT, HS, LP (external) |
| Hardware Stack | 3 levels |
| Operating Temperature | 0 C to +70 C (commercial, 'T' suffix) |
| Package | 20-pin SSOP (5.30 mm body, 0.65 mm pitch) |
| Mounting Type | Surface Mount (gull-wing) |
| MSL Level | 1 (unlimited floor life) |
| RoHS Status | Compliant |
| Lead-Free | Yes |
| Halogen-Free | Yes |
PIC16C58BT-20/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 or general I/O |
| Pin 4 | MCLR — Master Clear (active-low reset) / VPP programming voltage |
| Pin 5 | VSS — Ground reference |
| Pin 6 | RB0 — Bidirectional I/O port B bit 0 (interrupt on change) |
| Pin 7 | RB1 — Bidirectional I/O port B bit 1 (interrupt on change) |
| Pin 8 | RB2 — Bidirectional I/O port B bit 2 (interrupt on change) |
| Pin 9 | RB3 — Bidirectional I/O port B bit 3 (interrupt on change) |
| Pin 10 | RB4 — Bidirectional I/O port B bit 4 (interrupt on change) |
| Pin 11 | RB5 — Bidirectional I/O port B bit 5 (interrupt on change) |
| Pin 12 | RB6 — Bidirectional I/O port B bit 6 (interrupt on change) |
| Pin 13 | RB7 — Bidirectional I/O port B bit 7 (interrupt on change) |
| Pin 14 | VDD — Positive supply voltage (2.5 V to 5.5 V) |
| Pin 15 | OSC2 — Oscillator output / clock out |
| Pin 16 | OSC1 — Oscillator input / external clock in |
| Pin 17 | RA0 — Bidirectional I/O port A bit 0 |
| Pin 18 | RA1 — Bidirectional I/O port A bit 1 |
| Pin 19 | RA4 — Bidirectional I/O port A bit 4 (open-drain option) |
| Pin 20 | RA5 — Bidirectional I/O port A bit 5 |
Typical Applications
PIC16C58BT-20/SS is suitable for 7 applications: Consumer Remote Controls, LED Lighting Controllers, Battery Chargers and Power Management, Industrial Timers and Counters, Toy and Hobby Electronics, Sensor Interface Front-Ends, Appliance User Interface Boards.
Consumer Remote Controls
The PIC16C58BT-20/SS fits IR remote-control transmitter designs where 12 GPIO pins are sufficient to scan a 4x4 keypad matrix and drive an IR LED via PWM-emulated 38 kHz carrier. Its 3 KB OTP holds the encoding tables for SIRC, RC5/RC6, and NEC protocols, while 73 bytes RAM provides stack/buffer space for key debounce and repeat-frame logic. The 20 MHz CPU executes one instruction per 200 ns, well below the 26 us carrier half-period budget, leaving headroom for software UART-style debug output. OTP memory is acceptable because shipping volumes are high and code never changes after release. Compared to a PIC16F series part, the PIC16C58BT-20/SS saves USD 0.20 to USD 0.50 per unit in volume, which matters in sub-USD 5 remotes.
Recommended
LED Lighting Controllers
For entry-level decorative LED strips and architectural lighting, the PIC16C58BT-20/SS provides eight to twelve PWM-emulated channels via software bit-banging on its GPIO pins, sufficient for RGB or RGBW color mixing with refresh rates above 100 Hz to avoid visible flicker. The 2.5 V to 5.5 V supply range aligns directly with 3.3 V or 5 V LED driver rails, eliminating an extra LDO. Its 73 bytes RAM fits the small state machine that runs chase, fade, and breathe patterns stored in the 3 KB OTP program memory. The 20-SSOP footprint is small enough for inline-connector-mounted controllers inside aluminum extrusions. Industrial variants (PIC16C58B-20I/SS) extend operating temperature to +85 C for outdoor-rated fixtures.
Recommended
Battery Chargers and Power Management
Low-end NiMH or single-cell Li-ion chargers based on the PIC16C58BT-20/SS use the 8-bit RTCC timer to implement CC/CV (constant-current/constant-voltage) charge profiles with software-defined termination on delta-V or time-out. The WDT provides safety recovery from firmware lockup if the I/O port driving the charge FET hangs, and POR ensures a clean start after battery insertion. The 12 GPIO pins accommodate temperature-sensor input, status LEDs, enable buttons, and the charge FET gate drive. The 2.5 V minimum VDD allows operation from a deeply discharged single Li-ion cell, simplifying bootstrap supply design. Industrial temperature grades (PIC16C58B-20I/SS) suit automotive and outdoor applications.
Recommended
Industrial Timers and Counters
The PIC16C58BT-20/SS is a strong fit for relay-based industrial timers, conveyor counters, and machine-cycle controllers where the application logic is purely digital and deterministic. Its 8-bit RTCC increments from an external 32.768 kHz crystal in LP mode, providing a real-time clock with 30.5 us resolution and negligible power draw. The 12 GPIO pins drive up to four relays (with suitable ULN2003 drivers) and read four optically isolated inputs. The 3 KB OTP holds state-machine code for several timer profiles selected by DIP switches. The WDT prevents permanent hang if relay contact welding causes an unexpected state.
Recommended
Toy and Hobby Electronics
Battery-powered toys, model-train controllers, and hobby robotics benefit from the PIC16C58BT-20/SS OTP cost model and tiny 20-SSOP footprint. Its 2.5 V minimum VDD extends runtime on two AA alkaline cells down to about 1.8 V equivalent. The Harvard architecture and deterministic instruction timing make motor-control PWM loops easy to code by hand. With 12 GPIO pins, four hobby servos or two DC motors plus sensors can be driven directly. The lack of integrated peripherals is acceptable because hobby firmware is typically hand-tuned and re-compiled for each new product variant.
Recommended
Sensor Interface Front-Ends
Simple sensor hubs that aggregate switch, reed, thermistor, and Hall-effect inputs use the PIC16C58BT-20/SS to debounce, condition, and transmit readings over a software UART or one-wire interface. The 3 KB OTP accommodates lookup tables for linearization and threshold comparisons for up to 12 channels. The WDT and POR ensure autonomous recovery after power brownouts common in remote sensor nodes. The static CMOS core draws microamps in LP oscillator mode, making it suitable for solar or energy-harvesting power budgets. Industrial temp-grade variants operate from -40 C to +85 C for outdoor deployments.
Recommended
Appliance User Interface Boards
Microwave ovens, washing machines, and coffee makers embed PIC16C58BT-20/SS-based UI boards that scan 4x4 keypads, drive 7-segment or 14-segment LED displays via software multiplexing, and read a single rotary encoder. The 12 GPIO pins are sufficient for 8 segment lines plus 4 digit/select lines, with no leftover channels for indicators. The 3 KB OTP holds lookup tables for character ROM, timer presets, and state-machine logic. Operating temperature 0 C to +70 C covers indoor kitchen environments; for oven-range products use the PIC16C58B-20I/SS industrial grade. OTP memory prevents inadvertent field reprogramming that could create safety issues.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C58BT-20/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C58B-20/SS | PIC16C58B-20I/SS | PIC16C58B-20E/SS | PIC16C58BT-04I/SS | PIC16C57-XT/SS |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | 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 | 20-SSOP - same |
| Program Memory | 3 KB OTP | 3 KB OTP | 3 KB OTP | 3 KB OTP | 3 KB OTP | 2 KB OTP (-33%) |
| Maximum CPU Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 4 MHz (-80%) | 4 MHz (-80%) |
| RAM | 73 bytes | 73 bytes | 73 bytes | 73 bytes | 73 bytes | 72 bytes |
| Operating Temperature | 0 C to +70 C (commercial) | 0 C to +70 C (commercial) | -40 C to +85 C (industrial) | -40 C to +125 C (extended) | -40 C to +85 C (industrial) | 0 C to +70 C (commercial) |
| I/O Pins | 12 | 12 | 12 | 12 | 12 | 12 |
| Watchdog Timer | Yes | Yes | Yes | Yes | Yes | Yes |
| Internal Oscillator | No (external required) | No | No | No | No | No |
Key Differentiators
- Largest OTP memory in the PIC16C5X baseline family (vs PIC16C57-XT/SS)
- 20 MHz CPU for time-sensitive software UART and PWM tasks (vs PIC16C58BT-04I/SS)
- Commercial temperature grade matches typical indoor appliances (vs PIC16C58B-20E/SS)
Design Notes
Place a 100 nF ceramic decoupling capacitor within 5 mm of the VDD pin (pin 14) and a 10 uF bulk capacitor on the same supply trace. The PIC16C5X core draws brief current spikes during instruction fetches; without local decoupling these spikes couple into VDD and may cause code execution anomalies. In LP oscillator mode the device consumes less than 1 mA active, so the bulk capacitor can be small. In HS mode at 20 MHz, peak current can approach 10 mA - the 100 nF cap handles the high-frequency component.
Keep the oscillator traces (OSC1, OSCC2, pins 15-16) short and symmetric. Route them on one side of the IC only, surrounded by a ground pour, to minimize stray capacitance that shifts the crystal load. For an HS-mode 20 MHz crystal, the load capacitors (typically 15-33 pF) must be placed close to OSC1 and OSC2. If using the RC oscillator mode for cost-sensitive designs, place the resistor and capacitor adjacent to OSC1 with the OSC2 pin left open or routed only as a buffered clock-out.
The PIC16C58BT-20/SS OTP memory is one-time-programmable: a programming mistake permanently bricks the device. Use a windowed JW package for firmware development, or better yet, develop on a PIC16F equivalent (such as PIC16F1827T-I/SS in the same SSOP-20 footprint) and only commit the verified firmware image to OTP parts for production. Also note that the baseline PIC16C5X core has only a 3-level hardware stack and no software-stack pointer; deeply nested subroutine calls will overflow and crash the device, so keep call depth at 3 or less.
Estimated: at VDD = 5 V, CPU = 20 MHz, all GPIO toggling at 50% duty, the PIC16C58BT-20/SS consumes approximately 16 mA active (per Microchip datasheet DC characteristics table). Power dissipation is therefore 5 V x 16 mA = 80 mW. With the 20-SSOP package theta_JA of approximately 108 C/W on a 4-layer JEDEC test board, junction temperature rise is only ~9 C above ambient, so no heatsink is required. In LP oscillator mode at 32 kHz, active current drops below 1 mA and quiescent current is below 1 uA, making the part suitable for battery-powered designs.
The PIC16C58BT-20/SS GPIO pins have TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2.0 V at 5 V VDD) and CMOS output drive of approximately 25 mA source/sink per pin (50 mA absolute max per port). For signals leaving the board, add a series resistor (100 ohm to 1 kohm) close to the driver pin to dampen transmission-line ringing. Port B pins feature interrupt-on-change capability; if not used as interrupts, disable the weak pull-ups in software to reduce current consumption.
Compliance Information
RoHS compliant per Microchip product page. SSOP-20 package uses matte-tin lead-free finish. Not AEC-Q100 qualified (consumer/commercial grade). Refer to Microchip's product environmental compliance page for full material declaration.