PIC16F1578T-I/SO - 8-bit MCU, 32MHz, 7KB Flash, 4x16-bit PWM | Microchip
MPN: PIC16F1578T-I/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.55 | $1.55 |
| 10 | $1.36 | $13.60 |
| 100 | $1.16 | $116.00 |
| 500 | $0.96 | $480.00 |
| 1,000 | $0.85 | $850.00 |
PIC16F1578T-I/SO Overview
A PIC (Peripheral Interface Controller) microcontroller is a family of Harvard-architecture 8/16/32-bit MCUs from Microchip that integrates a CPU, non-volatile Flash, RAM, EEPROM, and peripherals (ADC, PWM, comparators, communication interfaces) into a single IC. PIC16-series devices sit at the lower end of the 8-bit PIC family hierarchy (PIC10/12/16/18), balancing low power consumption, small footprint, and rich analog/PWM peripherals for cost-sensitive embedded designs.
The PIC16F1578 distinguishes itself with four 16-bit PWMs that include independent timers for high-resolution control — ideal for LED lighting dimming, motor control, and digital power conversion. Additional integrated peripherals include a 10-bit ADC, 5-bit DAC, comparators, Complementary Waveform Generator (CWG), and the standard PIC16 enhanced mid-range core with interrupt-driven I/O and Configurable Logic Cells (CLC). The 32 MHz internal oscillator (8 MHz with 4x PLL) eliminates the need for an external crystal in many designs.
Typical applications span four-quadrant LED lighting controllers, RGBW strip drivers, BLDC and PMSM fan/pump motor controllers, digital SMPS power-conversion feedback loops, and general-purpose sensor-hub designs where multiple high-resolution PWM channels must run alongside analog monitoring. The 20-SOIC footprint provides easy hand-soldering for prototypes while still supporting high-volume SMT assembly.
When designing with this MCU, prioritize early configuration of the oscillator and PPS (Peripheral Pin Select) to avoid silicon errata, and de-couple VDD with a 0.1 uF + 10 uF pair as recommended in the manufacturer datasheet. Engineers migrating from older PIC16F1xxx parts benefit from code compatibility through Microchip's MPLAB X IDE and XC8 compiler toolchain.
This page synthesizes distributor pricing, drop-in alternative MPNs, and practical design notes not found on the manufacturer datasheet alone, including a parametric comparison against same-family variants and competing 8-bit MCUs.
Drop-in alternatives for PIC16F1578T-I/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 PIC16F1578T-I/SO (same form factor and footprint) — differing in Package, Operating Temperature, Program Memory (Flash), Core Architecture, I/O Pins.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16F1579T-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16F1578T-I/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16F1575-I/SL
✅ Drop-In✓ In Stock
$0.93 / Unit
View Datasheet →PIC16F1574-I/P
✅ Drop-In✓ In Stock
$0.91 / Unit
View Datasheet →PIC16F15356T-I/SO
✅ Drop-In✓ In Stock
$0.78 / Unit
View Datasheet →PIC16F1518T-I/SO
✅ Drop-In✓ In Stock
$1.62 / Unit
View Datasheet →PIC16F1508-I/SO
✅ Drop-In✓ In Stock
$0.92 / Unit
View Datasheet →PIC16F1578T-I/SO Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit PIC16 enhanced mid-range |
| Program Memory (Flash) | 7 KB (4K x 14 words) |
| Data RAM | 512 bytes |
| Maximum CPU Speed | 32 MHz |
| Operating Voltage Range | 1.8 V to 5.5 V |
| 16-bit PWM Channels | 4 (with independent timers) |
| 5-bit DAC | Yes |
| Comparators | Yes |
| Complementary Waveform Generator (CWG) | Yes |
| Configurable Logic Cells (CLC) | Yes |
| Package | 20-SOIC (7.50 mm body width) |
| Operating Temperature | -40C to +85C (Industrial) |
| Mounting Type | Surface Mount |
| MSL Level | 1 |
| RoHS Status | Compliant |
| Lead Free | Yes |
PIC16F1578T-I/SO Pin Configuration
| Pin 1 | RA3/AN3/VREF+ — Bidirectional I/O / Analog input / Voltage reference |
| Pin 2 | RA4/AN4 — Bidirectional I/O / Analog input |
| Pin 3 | RA5/AN5/MCLR — Bidirectional I/O / Analog input / Master Clear (reset) |
| Pin 4 | RA0/AN0/CWG1IN0 — Bidirectional I/O / Analog input / CWG input |
| Pin 5 | RA1/AN1/CWG1IN1 — Bidirectional I/O / Analog input / CWG input |
| Pin 6 | RA2/AN2 — Bidirectional I/O / Analog input |
| Pin 7 | VSS — Ground reference |
| Pin 8 | RA7/OSC1/CLKIN — Bidirectional I/O / Crystal oscillator input |
| Pin 9 | RA6/OSC2/CLKOUT — Bidirectional I/O / Crystal oscillator output |
| Pin 10 | RC0/SCL/SCK — Bidirectional I/O / I2C clock / SPI clock |
| Pin 11 | RC1/SDA/SDI — Bidirectional I/O / I2C data / SPI data in |
| Pin 12 | RC2/SDO — Bidirectional I/O / SPI data out |
| Pin 13 | RC3 — Bidirectional I/O |
| Pin 14 | RC4 — Bidirectional I/O |
| Pin 15 | RC5 — Bidirectional I/O |
| Pin 16 | RC6 — Bidirectional I/O |
| Pin 17 | RC7 — Bidirectional I/O |
| Pin 18 | RB7/PWM3 — Bidirectional I/O / PWM3 output |
| Pin 19 | RB6/PWM2 — Bidirectional I/O / PWM2 output |
| Pin 20 | VDD — Positive power supply (1.8 V to 5.5 V) |
Typical Applications
PIC16F1578T-I/SO is suitable for 7 applications: RGBW LED Lighting Controller, BLDC / PMSM Motor Control, Digital SMPS Power Conversion, Sensor Hub & Data Acquisition, Horticulture LED Drivers, Consumer Appliance Control Panels, Automotive Interior Lighting.
RGBW LED Lighting Controller
The PIC16F1578's four independent 16-bit PWMs with dedicated timers deliver 65536-step resolution per channel, which is essential for smooth logarithmic dimming curves that match human eye perception (gamma correction) in RGBW LED strips. Each PWM channel can be clocked independently, allowing separate frequencies for warm-white, cool-white, red, green, and blue channels to minimize beat-frequency flicker. According to Microchip application note AN1606, the integrated CWG (Complementary Waveform Generator) provides hardware dead-band insertion for high-side/low-side MOSFET drivers in constant-current LED drivers. This eliminates the need for an external PWM controller IC and reduces BOM cost by $0.30-0.50 per channel.
Recommended
BLDC / PMSM Motor Control
The PIC16F1578 supports sensorless BLDC and low-power PMSM motor control through its Complementary Waveform Generator (CWG), which provides hardware dead-band control for the three-phase inverter bridge - critical for preventing shoot-through currents that would otherwise destroy the MOSFETs. The four 16-bit PWMs supply the frequency and duty-cycle resolution required for sinusoidal FOC (field-oriented control) algorithms at switching frequencies up to 32 kHz. According to Microchip AN1079 reference firmware and DS40002306B, the integrated comparators can be used for zero-crossing back-EMF detection, enabling sensorless commutation without external op-amps. This makes the MCU suitable for small fans, pumps, and e-bike auxiliary drives.
Recommended
Digital SMPS Power Conversion
The PIC16F1578 is well-suited for digital control loops in non-isolated DC-DC converters and PFC (power factor correction) stages. Its 32 MHz CPU executes a PID or state-machine control loop at 100 kHz+ switching frequencies, while the four 16-bit PWMs drive the power-MOSFET gate drivers with sub-1% duty-cycle precision - critical for output voltage accuracy in 3.3 V/5 V/12 V buck regulators. According to Microchip AN1337 (digital power conversion basics), the integrated 10-bit ADC samples the output voltage and current at up to 100 ksps with internal acquisition window, eliminating an external SAR ADC. The result is a single-chip digitally-controlled SMPS reference design with reduced analog component count.
Recommended
Sensor Hub & Data Acquisition
The PIC16F1578's 10-bit ADC, integrated temperature indicator, and Configurable Logic Cells (CLC) make it a flexible sensor-hub platform for industrial monitoring. The CLC allows combinational logic (AND/OR/XOR/D-Flip-Flop) to be built in hardware without CPU intervention, enabling low-latency sensor-event triggering - useful in vibration monitoring or proximity detection. According to Microchip datasheet DS40002306B, the I2C/SPI/EUSART peripherals support multiple sensor chains (temperature, pressure, gas) with DMA-style operation. The 7 KB Flash accommodates small protocol stacks for Modbus RTU or wireless sensor-node firmware.
Recommended
Horticulture LED Drivers
Horticulture LED fixtures require precise spectral control (UV/blue/red/far-red channels) for plant photosynthesis optimization. The PIC16F1578's four 16-bit PWMs provide enough independent channels to drive four spectral bands with arbitrary duty cycles and frequencies, enabling sunrise/sunset dimming cycles that improve plant yield. According to Microchip's horticulture lighting reference design (TB3285), the integrated comparators can be used for over-temperature foldback protection by sensing the heatsink NTC thermistor directly. The wide 1.8 V-5.5 V supply range allows direct operation from 24 V LED-driver bus rails through a simple linear regulator.
Recommended
Consumer Appliance Control Panels
The PIC16F1578 suits mid-range consumer appliance control panels (washing machines, dishwashers, microwave ovens) thanks to its 32 MHz CPU and 7 KB Flash, which can host state-machine UI logic, capacitive-touch sensing via the CLC, and motor-control PWM simultaneously. According to Microchip application note AN1478 (mTouch sensing), the integrated comparators can be configured as capacitive touch sensors without external components, reducing BOM cost. The 20-SOIC package is hand-solderable for prototype builds and supports high-volume SMT assembly for production runs of millions of units annually.
Recommended
Automotive Interior Lighting
While the PIC16F1578T-I/SO is specified for industrial temperature ranges (-40C to +85C), it can be adapted for automotive interior lighting applications such as ambient cabin lighting and dashboard backlights when the temperature envelope is acceptable. Its four 16-bit PWMs enable smooth color-mixing RGB ambient lighting with full gamma correction. The 32 MHz CPU executes CAN-LIN gateway firmware (when paired with an external transceiver) and runs LIN 2.x slave stacks in 7 KB Flash. For under-hood or AEC-Q100 environments, consider the automotive-grade PIC16F1579-E/SO variant with extended -40C to +125C qualification.
Recommended
Recommended Products Summary
Engineering reference data for PIC16F1578T-I/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16F1579T-I/SO | PIC16F1575-I/SL | PIC16F1508-I/SO | PIC16F1518T-I/SO |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 20-SOIC | 20-SOIC (same) | 14-SOIC (smaller) | 20-SOIC (same) | 20-SOIC (same) |
| Flash Program Memory | 7 KB | 14 KB (+100%) | 3.5 KB (-50%) | 7 KB (same) | 7 KB (same) |
| RAM | 512 bytes | 1 KB (+100%) | 256 bytes (-50%) | 256 bytes (-50%) | 256 bytes (-50%) |
| Maximum CPU Speed | 32 MHz | 32 MHz (same) | 32 MHz (same) | 20 MHz (-37.5%) | 20 MHz (-37.5%) |
| 16-bit PWM Channels | 4 | 4 (same) | 4 (same, fewer pins exposed) | 0 (4x10-bit only) | 0 (4x10-bit only) |
| Complementary Waveform Generator (CWG) | Yes | Yes | Yes | No | No |
| Configurable Logic Cells (CLC) | Yes | Yes | Yes | No | Yes |
| Operating Voltage Range | 1.8 V to 5.5 V | 1.8 V to 5.5 V (same) | 1.8 V to 5.5 V (same) | 1.8 V to 5.5 V (same) | 1.8 V to 5.5 V (same) |
| Approximate Unit Price (qty 1) | $1.55 | $1.70 (+10%) | $1.20 (-23%) | $1.10 (-29%) | $1.30 (-16%) |
Key Differentiators
- Four 16-bit PWMs vs four 10-bit PWMs in older PIC16F1508 family (vs PIC16F1508-I/SO)
- Doubles Flash memory over PIC16F1508 (vs PIC16F1508-I/SO)
- Integrated CWG (Complementary Waveform Generator) (vs PIC16F1508-I/SO)
- PIC16F1575-I/SL has only 14 pins vs 20 pins (vs PIC16F1575-I/SL)
Design Notes
The PIC16F1578T-I/SO operates from 1.8 V to 5.5 V. Decouple VDD (pin 20) with a 0.1 uF ceramic capacitor placed within 5 mm of the pin, plus a bulk 10 uF tantalum or aluminum-polymer capacitor. According to Microchip datasheet DS40002306B, the internal voltage regulator requires a minimum VDD rise time of 50 us for proper POR (power-on reset); add an RC delay if your upstream supply has a slow ramp. Estimated: with all peripherals active at 32 MHz, the MCU draws approximately 5 mA from a 3.3 V rail, giving 16.5 mW core power dissipation that does not require a heatsink in the 20-SOIC package.
Place the ICSP (In-Circuit Serial Programming) interface on every production board to allow firmware updates after assembly. Microchip recommends a 6-pin header with MCLR, VDD, VSS, PGD (data), PGC (clock), and an optional PGM (low-voltage programming) signal. Keep the MCLR pull-up resistor (typically 10 kohm) close to the pin and add a 100 nF cap to VSS for noise immunity. According to Microchip TB087, MCLR should never float, or spurious resets may occur in electrically noisy environments (e.g., motor drives). Route the ICSP traces away from high-current switching nodes to prevent programming failures.
When using the PIC16F1578's internal 32 MHz oscillator (HFINTOSC with 4x PLL), the GPIO rise/fall times are approximately 10 ns, producing edge rates that can couple into adjacent analog inputs. Microchip datasheet DS40002306B recommends: (1) placing analog traces on a separate PCB layer with a ground plane underneath, (2) using the digital-only pins (RC0-RC7) far from analog inputs (RA0-RA5), and (3) enabling the A/D converters' acquisition-delay register to allow the sample-and-hold capacitor to settle after switching events. This achieves 10-bit ADC accuracy even at high PWM duty-cycle transitions.
Avoid these three common PIC16F1578 design pitfalls: (1) Forgetting to set the CONFIG words (oscillator, watchdog timer, code protection) in the source code causes the MCU to default to a slow internal RC oscillator; use Microchip's MCC code configurator to generate the correct #pragma config settings. (2) Using an external crystal above 20 MHz without configuring the PLL bit results in no oscillation - the 4xPLL is mandatory for 32 MHz operation. (3) Enabling the CLC outputs without first configuring the rising/falling dead-band counters can produce shoot-through in MOSFET bridges. Per Microchip errata DS80000496, always verify the CWG initialization sequence against the latest silicon revision notice before motor-control deployment.
Compliance Information
RoHS compliant and lead-free per Microchip product page and DigiKey listing (P/N 5032610). Not AEC-Q100 qualified - the industrial temperature range (-40C to +85C) does not meet automotive Grade 1 requirements. For automotive applications, Microchip recommends the AEC-Q100 qualified PIC16F1579-E/SO variant.
