PIC16F1508-I/SO - 8-Bit MCU, 7KB Flash, 18 I/O, 10-bit ADC | Microchip
MPN: PIC16F1508-I/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.42 | $1.42 |
| 10 | $1.28 | $12.80 |
| 100 | $1.14 | $114.00 |
| 500 | $1.02 | $510.00 |
| 1,000 | $0.92 | $920.00 |
PIC16F1508-I/SO Overview
What is an 8-bit microcontroller? An 8-bit MCU is a small computer-on-a-chip built around a CPU datapath and registers of 8 bits width, executing one byte at a time. Within the broader embedded hierarchy, 8-bit MCUs sit below 16-bit and 32-bit microcontrollers in performance but above discrete logic in integration, offering a cost-optimized platform for control, sensing, and simple connectivity. The PIC16F1508 belongs to the PIC16 enhanced mid-range family, which uses a modified Harvard RISC architecture with 49 instructions and 14-bit instruction word width.
Key features include up to 20 MHz operation (200 ns instruction cycle), 7KB self-programmable Flash with EEPROM emulation, 256 bytes RAM, 18 I/O with interrupt-on-change capability, 10-bit ADC with up to 12 channels, four 8-bit timers plus two CCP modules, and an Enhanced Universal Synchronous/Asynchronous Receiver/Transmitter (EUSART). The CIPs include Configurable Logic Cells (CLC), Numerically Controlled Oscillator (NCO), and Complementary Waveform Generator (CWG), which allow hardware-state-machine tasks without CPU intervention.
Technical depth: the device uses a 14-bit instruction word with a 16-level stack, single-cycle hardware multiply, and an internal 16 MHz high-speed oscillator trimmed to ±1% accuracy. The XLP feature set offers sleep currents as low as 20 nA typical, making it suitable for battery-backed IoT nodes. The 10-bit ADC supports acquisition across up to 12 channels with hardware conversion trigger options.
Typical applications include consumer appliances, LED lighting controllers, sensor signal conditioning, battery chargers, low-end motor control, and small home appliances. The 20-pin SOIC footprint is breadboard-friendly and supports both hand prototyping and high-volume SMT assembly.
When designing with this part, budget one 0.1 µF decoupling capacitor per VDD pin pair and place it within 3 mm of the package. The MCLR reset pin should be tied to VDD through a 10 kΩ pull-up for reliable in-circuit serial programming; an optional 100 nF capacitor on MCLR improves noise immunity in electrically noisy industrial environments.
This page synthesizes distributor stock and pricing, verified drop-in alternatives drawn from the same PIC16F150x family, and practical design notes that complement the manufacturer datasheet.
Drop-in alternatives for PIC16F1508-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 PIC16F1508-I/SO (same form factor and footprint) — differing in Package, ADC, Program Memory (Flash), Operating Temperature, Timers.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16F1509-I/SO
✅ Drop-In✓ In Stock
$1.34 / Unit
View Datasheet →PIC16F1508-I/P
✅ Drop-In✓ In Stock
$1.04 / Unit
View Datasheet →PIC16F1508-I/SS
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$1.02 / Unit
View Datasheet →PIC16F1507-I/SO
✅ Drop-In✓ In Stock
$0.92 / Unit
View Datasheet →PIC16F1503-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16F1508-I/SO Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC16 Enhanced Mid-Range (8-bit) |
| Program Memory (Flash) | 7 KB |
| RAM | 256 bytes |
| EEPROM | Not present (Flash self-programming emulates EEPROM) |
| Maximum CPU Speed | 20 MHz |
| Instruction Cycle | 200 ns |
| Operating Voltage Range | 2.3 V to 5.5 V |
| I/O Pins | 18 |
| ADC | 10-bit, up to 12 channels |
| Timers | 4 x 8-bit, 1 x 16-bit |
| CCP Modules | 2 |
| EUSART | 1 |
| MSSP (SPI/I2C) | 1 |
| Core Independent Peripherals | CLC, NCO, CWG, PWM, Configurable Logic |
| Package | 20-pin SOIC (SO) |
| Operating Temperature | -40C to +85C (Industrial) |
| RoHS Status | Compliant |
| Programming/Debug | ICSP via PICkit 3 / MPLAB ICD 3 |
PIC16F1508-I/SO Pin Configuration
| Pin 1 | RA3/AN3/VREF+/T0CKI/MCLR — Bidirectional I/O / ADC input / positive voltage reference / Timer0 clock / Master Clear reset |
| Pin 2 | RA2/AN2/T0CKI — Bidirectional I/O / ADC input / Timer0 clock input |
| Pin 3 | RA1/AN1 — Bidirectional I/O / ADC input |
| Pin 4 | RA0/AN0 — Bidirectional I/O / ADC input |
| Pin 5 | RA5/AN4 — Bidirectional I/O / ADC input |
| Pin 6 | RA4/AN6 — Bidirectional I/O / ADC input |
| Pin 7 | RC5 — Bidirectional I/O |
| Pin 8 | RC4 — Bidirectional I/O |
| Pin 9 | RC3 — Bidirectional I/O |
| Pin 10 | RC2/AN10 — Bidirectional I/O / ADC input |
| Pin 11 | RC1/AN8 — Bidirectional I/O / ADC input |
| Pin 12 | RC0/AN11 — Bidirectional I/O / ADC input |
| Pin 13 | RC6 — Bidirectional I/O |
| Pin 14 | RC7 — Bidirectional I/O |
| Pin 15 | VSS — Ground reference |
| Pin 16 | RB7 — Bidirectional I/O |
| Pin 17 | RB6 — Bidirectional I/O |
| Pin 18 | RB5/AN13 — Bidirectional I/O / ADC input |
| Pin 19 | VSS — Ground reference (secondary) |
| Pin 20 | VDD — Positive supply voltage (2.3 V to 5.5 V) |
Typical Applications
PIC16F1508-I/SO is suitable for 7 applications: Consumer Appliance Control, LED Lighting Controller, Battery Charger Management, Sensor Signal Conditioning, Small Motor Control (BLDC / Stepper), User Interface Boards (HMI Modules), Industrial Sensor Transmitters.
Consumer Appliance Control
The PIC16F1508-I/SO is well suited to consumer appliance control boards such as coffee makers, microwaves, and washing machines. Its 18 I/O pins can drive multiplexed 7-segment LED displays, keypad scans, and triac-fired heater or motor loads simultaneously, while the 10-bit ADC reads thermistor inputs with adequate resolution for closed-loop temperature regulation. The 7 KB Flash accommodates user-interface state machines plus lookup tables. Compared with discrete logic replacements, this MCU reduces BOM cost and board area. The 2.3-5.5 V supply range simplifies 3.3 V or 5 V designs, and XLP sleep currents below 20 nA extend battery life in cordless appliances.
Recommended
LED Lighting Controller
For LED lighting, the PIC16F1508-I/SO drives multiple PWM channels via its enhanced PWM peripheral and Core Independent Waveform Generator (CWG), enabling smooth dimming and color-mixing without CPU overhead. The 10-bit ADC reads ambient light sensors or potentiometer inputs for closed-loop brightness control. At 20 MHz, the device can refresh 4 PWM channels at 10 kHz with less than 5% CPU load. The XLP feature extends battery operation for portable fixtures. Designers can implement DMX or DALI receive protocols using the EUSART plus interrupt-driven firmware within the 7 KB Flash budget, making this part a cost-effective choice for architectural and decorative lighting.
Recommended
Battery Charger Management
The PIC16F1508-I/SO is a strong fit for single-cell Li-ion or NiMH charger controllers in portable devices. Its 10-bit ADC monitors battery voltage, charge current (across a sense resistor), and die temperature with sufficient resolution for CV/CC charge profiles. The CWG and configurable logic cells can implement charger-state sequencing in hardware, reducing firmware complexity. With XLP sleep current of 20 nA, standby drain is negligible during storage. The 256-byte RAM accommodates charge-log buffers, and 7 KB Flash holds state-machine plus safety timers. The wide 2.3-5.5 V supply range supports direct USB 5 V input through a regulator.
Recommended
Sensor Signal Conditioning
In IoT sensor nodes, the PIC16F1508-I/SO aggregates signals from multiple analog and digital sensors and pre-processes them before transmitting. The 10-bit ADC samples up to 12 channels for thermocouple, thermistor, or strain-gauge bridges, while the MSSP peripheral reads SPI or I2C sensors such as accelerometers and environmental chips. Core Independent Peripherals like the CLC and NCO offload pulse counting and frequency synthesis, allowing the CPU to sleep longer between wake-ups. The 7 KB Flash accommodates TinyML-style threshold-based classification or simple moving-average filters. At 3.3 V active current under 1.4 mA, battery life spans years in low-duty-cycle deployments.
Recommended
Small Motor Control (BLDC / Stepper)
The PIC16F1508-I/SO supports small brushless DC or stepper motor control using its enhanced PWM, Complementary Waveform Generator, and 10-bit ADC for back-EMF sensing. With 18 I/O, the MCU can drive three half-bridges directly via gate-driver ICs while monitoring current and rotor position. The 200 ns instruction cycle allows 20 kHz PWM with cycle-by-cycle current limiting implemented in firmware. The CLC peripheral implements hardware commutation triggers without CPU latency. Designers can use the 7 KB Flash to store speed profiles and the 256-byte RAM as a commutation lookup buffer. Operating from -40C to +85C, the part is suitable for industrial motor-control environments.
Recommended
User Interface Boards (HMI Modules)
The PIC16F1508-I/SO powers cost-effective human-machine interface modules such as control panels, thermostats, and small keypads. Its 18 I/O scan up to 8x8 matrix keypads while driving OLED or character LCDs through I2C or SPI using the MSSP. The 10-bit ADC reads slider or rotary encoder analog inputs. The 7 KB Flash stores multilingual UI strings and menu hierarchies, and 256 bytes RAM holds the active screen buffer. With XLP sleep below 20 nA, the MCU draws negligible current when the display is blanked, extending battery life in wireless remotes. Industrial temperature rating supports outdoor HMI installations.
Recommended
Industrial Sensor Transmitters
In 4-20 mA loop-powered or RS-485 sensor transmitters, the PIC16F1508-I/SO conditions sensor signals and outputs either analog current or digital protocol. The 10-bit ADC reads bridge, RTD, or process-variable inputs, while the EUSART drives RS-485 or Modbus transceivers. The 18 I/O can support multiple sensor channels or HART modem chips. With XLP sleep current of 20 nA and active current under 1.4 mA, this MCU fits loop-powered designs where total current budget is 3.5 mA. The -40C to +85C industrial temperature range and SOIC package suit harsh factory-floor installations.
Recommended
Recommended Products Summary
Engineering reference data for PIC16F1508-I/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16F1509-I/SO | PIC16F1508-I/P | PIC16F1508-I/SS | PIC16F1507-I/SO | PIC16F1503-I/SO |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 20-pin SOIC (SO) | 20-pin SOIC (SO) - same | 20-pin PDIP (P) - THT version, pin-compatible electrically | 20-pin SSOP (SS) - same die, smaller SMT | 20-pin SOIC (SO) - same | 20-pin SOIC (SO) - same footprint, fewer peripherals |
| Flash Memory | 7 KB | 10 KB | 7 KB (same die) | 7 KB (same die) | 3.5 KB | 3.5 KB |
| RAM | 256 bytes | 512 bytes | 256 bytes | 256 bytes | 128 bytes | 128 bytes |
| I/O Pins | 18 | 20 | 18 | 18 | 17 | 12 |
| ADC | 10-bit, 12 channels | 10-bit, 14 channels | 10-bit, 12 channels | 10-bit, 12 channels | 10-bit, 12 channels | 10-bit, 8 channels |
| Operating Voltage | 2.3 V to 5.5 V | 2.3 V to 5.5 V | 2.3 V to 5.5 V | 2.3 V to 5.5 V | 2.3 V to 5.5 V | 2.3 V to 5.5 V |
| Core Independent Peripherals | CLC, NCO, CWG, PWM | CLC, NCO, CWG, PWM (richer set) | CLC, NCO, CWG, PWM (same die) | CLC, NCO, CWG, PWM (same die) | CLC, NCO, CWG, PWM | CLC, PWM only |
| Unit Price (qty 1) | $1.42 USD | $1.55 USD | $1.55 USD | $1.45 USD | $1.25 USD | $1.18 USD |
Key Differentiators
- Balanced Flash-to-I/O ratio with CIPs (vs PIC16F1507-I/SO)
- Industrial temperature grade with rich ADC (vs PIC16F1503-I/SO)
- Same silicon across SOIC, PDIP, and SSOP (vs PIC16F1508-I/P)
Design Notes
Decouple VDD with a 0.1 µF low-ESR ceramic capacitor placed within 3 mm of the VDD/VSS pins, plus a bulk 1 µF to 10 µF tantalum or ceramic capacitor on the same rail. The PIC16F1508 has two VSS pins (pin 15 and pin 19) and one VDD pin (pin 20); both VSS pins must be connected to ground to provide a low-impedance return path and reduce EMI. In battery applications, place a 100 nF cap in parallel with the MCLR pull-up to filter noise.
Keep the ICSP clock (PGC) and data (PGD) traces short and away from high-frequency switching nodes. The MCLR pin should have a 10 kΩ pull-up to VDD; do not leave it floating. For in-circuit programming, leave a 2x3 or 1x6 0.1 inch header footprint accessible. Route analog signals (ANx) over a continuous ground plane and avoid crossing digital switching traces to minimize ADC coupling.
Do not exceed 5.5 V on any pin; the absolute maximum VDD is 5.5 V and ESD diodes clamp overshoots. When migrating from PIC16F88, note that PIC16F1508 lacks a legacy EEPROM block - use Flash self-programming instead. Brown-out reset (BOR) should be enabled in configuration words for robust industrial operation. Do not tie I/O pins directly to VDD without a series resistor if they will be reconfigured as outputs at runtime.
Place the decoupling capacitor loop area as small as possible: VDD via -> decoupling cap -> VSS via should form a tight triangle with trace length under 5 mm. Keep the analog reference (RA3/VREF+) away from digital switching lines; route a dedicated VREF trace or use internal reference to avoid noise pickup. For SOIC-20 packages, use a ground pour on the top layer stitched with vias to the bottom ground plane.
Compliance Information
RoHS and REACH compliant per Microchip product page. Not AEC-Q100 qualified - this is an industrial-grade part. For automotive applications consider PIC16F1509-E/SO or PIC18F equivalent.
