PIC16F677T-I/ML - 8-bit PIC MCU, 3.5KB Flash, 20MHz | Microchip
MPN: PIC16F677T-I/ML ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.32 | $2.32 |
| 10 | $2.18 | $21.80 |
| 100 | $1.94 | $194.00 |
| 500 | $1.72 | $860.00 |
| 1,000 | $1.55 | $1,550.00 |
PIC16F677T-I/ML Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory, working RAM, and programmable I/O peripherals. PIC microcontrollers from Microchip use a RISC-based Harvard architecture, meaning separate program and data buses allow simultaneous instruction fetch and data access, which gives the PIC16F677 its deterministic 200 ns instruction cycle. Within the broader taxonomy, the PIC16F677 is an 8-bit microcontroller, general-purpose MCU, and a member of the power management and signal chain context of embedded systems.
Key features include 18 general-purpose I/O pins with interrupt-on-change capability, a 10-bit ADC with up to 12 channels, two 8-bit timers plus one 16-bit timer, an enhanced USART, and an MSSP module that can be configured for SPI or I2C. The I indicates the industrial -40C to +85C temperature range and the ML suffix indicates the QFN-20 package. The T suffix denotes tape-and-reel packaging for high-volume assembly.
Typical applications include industrial sensor interfaces, low-cost motor control, battery-powered instrumentation, and consumer white-goods control boards. The 12-channel ADC and 20 MHz CPU are sufficient for closed-loop PID tasks and simple digital filtering. Wide-VIN tolerance also suits 4.5V-5.5V bus-powered industrial modules.
When designing with this device, budget the 18 I/O pins across your peripherals - the QFN package has no extra pads for extra GPIOs. Add a 100 nF decoupling capacitor on VDD and a 10 uF bulk capacitor within 5 mm of the supply pin to suppress switching noise on the internal ADC reference.
This page consolidates distributor pricing, pin-compatible alternatives, and practical design notes that the standalone datasheet does not surface in a single place.
Drop-in alternatives for PIC16F677T-I/ML — 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 PIC16F677T-I/ML (same form factor and footprint) — differing in Package, Timers, I/O Pins, Operating Temperature, Core Architecture.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16F677-I/ML
✅ Drop-In✓ In Stock
$1.42 / Unit
View Datasheet →PIC16F677-E/ML
✅ Drop-In✓ In Stock
$0.73 / Unit
View Datasheet →PIC16F676T-I/ML
⚠️ 参数待验证📋 Reference alternative (not in catalog)
PIC16F677T-I/ML Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC16 (mid-range x14) |
| Data Bus Width | 8-bit |
| Maximum CPU Speed | 20 MHz |
| Instruction Cycle | 200 ns |
| Program Memory (Flash) | 3.5 KB (2K x 14) |
| SRAM | 128 bytes |
| EEPROM | 256 bytes |
| I/O Pins | 18 |
| ADC | 10-bit, up to 12 channels |
| Timers | 2 x 8-bit, 1 x 16-bit |
| Communication Peripherals | EUSART, MSSP (SPI / I2C) |
| Supply Voltage | 2.0 V to 5.5 V |
| Operating Temperature | -40 C to +85 C (Industrial, 'I') |
| Package | 20-pin QFN (4x4 mm) with exposed pad ('ML') |
| Packaging Form | Tape and Reel ('T') |
| Mounting Type | Surface Mount |
PIC16F677T-I/ML Pin Configuration
| Pin 1 | VDD — Positive supply voltage (2.0-5.5 V) |
| Pin 2 | RA5/T1CKI/SS/HLVDIN — GPIO RA5 / Timer1 clock input / SPI slave select / HLVD input |
| Pin 3 | RA4/AN3/T1G/HLVDOUT — GPIO RA4 / ADC channel 3 / Timer1 gate / HLVD output |
| Pin 4 | RA3/MCLR/VPP — GPIO RA3 / Master Clear (reset, active-low) / programming voltage |
| Pin 5 | RA2/AN2/T0CKI/INT/COUT — GPIO RA2 / ADC channel 2 / Timer0 clock / external interrupt / comparator output |
| Pin 6 | RA1/AN1/C12IN1-/ICSPCLK — GPIO RA1 / ADC channel 1 / comparator input / ICD clock |
| Pin 7 | RA0/AN0/C12IN0+/ICSPDAT — GPIO RA0 / ADC channel 0 / comparator input / ICD data |
| Pin 8 | VSS — Ground reference |
| Pin 9 | RA7/OSC1/CLKIN — GPIO RA7 / crystal oscillator input / external clock input |
| Pin 10 | RA6/OSC2/CLKOUT — GPIO RA6 / crystal oscillator output / clock output |
| Pin 11 | RC0/AN4/C2IN+ — GPIO RC0 / ADC channel 4 / comparator input |
| Pin 12 | RC1/AN5/C2IN-/P1D — GPIO RC1 / ADC channel 5 / comparator input / PWM output |
| Pin 13 | RC2/AN7/P1A — GPIO RC2 / ADC channel 7 / PWM output |
| Pin 14 | RC3/AN8/SS/P1C — GPIO RC3 / ADC channel 8 / SPI slave select / PWM output |
| Pin 15 | RC4/AN9/CK/P1B — GPIO RC4 / ADC channel 9 / USART clock / PWM output |
| Pin 16 | RC5/AN10/DT/P2B — GPIO RC5 / ADC channel 10 / USART data / PWM output |
| Pin 17 | RC6/AN8/SS/TX/CK — GPIO RC6 / ADC channel 8 / SPI SS / USART TX or clock |
| Pin 18 | RC7/AN9/SDO/RX/DT — GPIO RC7 / ADC channel 9 / SPI SDO / USART RX or data |
| Pin 19 | RB7/AN11/PGD — GPIO RB7 / ADC channel 11 / ICD data |
| Pin 20 | RB6/AN5/PGC — GPIO RB6 / ADC channel 5 / ICD clock |
| Pin EP | EP — Exposed thermal pad - connect to VSS for thermal dissipation |
Typical Applications
PIC16F677T-I/ML is suitable for 6 applications: Industrial Sensor Interface, Battery-Powered Instrumentation, Small Motor Control (BLDC / Stepper), Consumer White Goods Control, Automotive Body Electronics (Non-Safety), Smart Sensor Edge Node.
Industrial Sensor Interface
The PIC16F677T-I/ML's 12-channel 10-bit ADC and 20 MHz CPU make it a strong fit for multi-sensor industrial acquisition nodes that digitize 4-20 mA loops, thermocouples, or 0-10V analog signals before forwarding data over RS-485. Its 2.0V-5.5V supply range simplifies designs that must accept either battery backup or a 24V-derived 5V rail. Placed alongside an RS-485 transceiver like the MAX3485, the PIC16F677 runs the enhanced USART as the fieldbus interface while the ADC scans sensors at a few hundred Hz per channel. The 256-byte EEPROM stores calibration coefficients non-volitely, and the 128-byte SRAM buffers scan results between transmissions. Compared with a 32-bit Cortex-M0+ part, this PIC16F677 wins on BOM cost at the expense of headroom for complex signal processing.
Recommended
Battery-Powered Instrumentation
Wide 2.0V-5.5V operation and 20 MHz CPU allow the PIC16F677T-I/ML to run directly from a single lithium cell or two AA cells with a low-dropout regulator, eliminating boost converters. Its nanoWatt XLP-like sleep modes drop current to under 1 uA with the ADC off, extending battery life in portable instruments. Typical use cases include handheld multimeters, digital calipers, and remote data loggers that wake on timer or external interrupt, take a sensor reading, log it to EEPROM, and return to sleep. The 256-byte EEPROM is adequate for storing hours of timestamped samples. Compared with a discrete op-amp + ADC + MCU trio, this PIC16F677 reduces part count and PCB area.
Recommended
Small Motor Control (BLDC / Stepper)
The PIC16F677T-I/ML's three timers (two 8-bit, one 16-bit) plus PWM-oriented capture/compare peripherals support simple BLDC or stepper commutation loops in cost-sensitive appliances like desk fans and small pumps. Its 20 MHz instruction cycle and 200 ns latency keep the commutation interrupt service routine short enough to run at 20 kHz PWM without jitter. GPIO toggles drive discrete FET bridges via gate drivers such as the MCP14A0151. The 18 GPIO pins comfortably cover Hall-sensor inputs, PWM outputs, and a fault input. Compared with a dedicated motor-control IC, this PIC16F677 gives firmware-defined commutation profiles and torque curves at a much lower unit cost.
Recommended
Consumer White Goods Control
Dishwashers, washing machines, and ovens need a 5V-tolerant 8-bit MCU with enough flash for user-interface state machines and EEPROM-backed cycle counters, exactly what the PIC16F677T-I/ML provides. Its 18 GPIOs drive 7-segment LED displays, capacitive touch pads, and triac-fired AC loads via optoisolators. The MSSP peripheral handles I2C EEPROM for user settings while the EUSART talks to the main appliance bus. Industrial temperature grade is sufficient for ambient white-goods enclosures. Compared with an ASIC or 32-bit MCU, this PIC16F677 keeps the BOM cost low enough to leave in a sub-$200 retail appliance.
Recommended
Automotive Body Electronics (Non-Safety)
The PIC16F677T-I/ML serves in non-safety body modules such as ambient lighting controllers, seat-position memory, and HVAC blend-door drivers where AEC-Q100 qualification is not mandatory. Its 18 GPIO pins switch low-side MOSFETs and read switch matrices, while the ADC monitors thermistors and potentiometers for feedback. Operating temperature -40C to +85C covers the cabin environment. For under-hood or safety-critical modules, step up to AEC-Q100-qualified PIC16F variants. Compared with a dedicated LIN transceiver MCU, this PIC16F677 is cheaper in high-volume non-safety nodes.
Recommended
Smart Sensor Edge Node
The PIC16F677T-I/ML runs the MSSP as an I2C master to poll a sensor hub (temperature + humidity + accelerometer), performs simple thresholding or peak detection in firmware, and reports over UART or RF. Its 3.5 KB flash fits a small RTOS loop or polled-state machine without paging. At 128 B SRAM, the firmware can buffer a few samples between transmissions. Compared with a Cortex-M0+ IoT MCU, this PIC16F677 has lower active current at low clock rates and shorter wake-up latency from sleep. The 256 B EEPROM stores per-node calibration and security keys.
Recommended
Recommended Products Summary
Engineering reference data for PIC16F677T-I/ML — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16F677-I/ML | PIC16F677-E/ML | PIC16F676T-I/ML |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | QFN-20 (ML) | QFN-20 (ML) - same | QFN-20 (ML) - same | QFN-20 (ML) - same |
| Core Architecture | PIC16 mid-range x14 | PIC16 mid-range x14 | PIC16 mid-range x14 | PIC16 mid-range x14 |
| Maximum CPU Speed | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Flash Memory | 3.5 KB | 3.5 KB | 3.5 KB | 1.75 KB |
| SRAM | 128 bytes | 128 bytes | 128 bytes | 64 bytes |
| EEPROM | 256 bytes | 256 bytes | 256 bytes | 256 bytes |
| ADC | 10-bit, 12 channels | 10-bit, 12 channels | 10-bit, 12 channels | 10-bit, 12 channels |
| EUSART | Yes | Yes | Yes | No |
| Operating Temperature | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) | -40 C to +125 C (Extended) | -40 C to +85 C (Industrial) |
Key Differentiators
- Tape-and-reel packaging variant (vs PIC16F677-I/ML)
- Industrial temperature range optimized for factory environments (vs PIC16F677-E/ML)
- Enhanced USART plus 256-byte EEPROM (vs PIC16F676T-I/ML)
Design Notes
The QFN-20 (ML) package exposes a die-attach pad (EP) that is also the primary thermal path. Connect the EP to a copper pour of at least 50 mm^2 on the top or bottom layer, stitched with 8-12 thermal vias (0.3 mm drill, 0.5 mm pitch) to a bottom-plane copper pour. Without EP soldering, junction temperature can rise 30 C/W higher than the datasheet 84 C/W theta_JA. Estimated: assuming 50 mm^2 1 oz copper pour, theta_JA drops to ~40 C/W; verify by thermal probe in worst-case firmware.
Place a 100 nF decoupling capacitor within 2 mm of the VDD pin and a 10 uF bulk capacitor within 5 mm, sharing a common ground via to the EP pour. The PIC16F677 draws brief mA-class current spikes when the CPU executes from flash; inadequate decoupling causes ADC reference droop and brown-out resets. For ADC precision applications, add a 10 uH pi-filter between VDD and AVCC routing to keep digital switching noise out of the analog rail.
QFN-20 has 0.5 mm pitch land pads and a 3.5 mm x 3.5 mm exposed pad. Use a non-solder-mask-defined (NSMD) pad with 0.25 mm solder mask expansion for reliable solder joints. Stencil aperture for the EP should be a checkerboard of 0.6 mm squares covering 50-60% of the pad to limit solder starvation. Avoid placing via-in-pad unless capped; bare vias wick solder away from QFN thermal joints.
Do not leave the MCLR pin floating; tie it to VDD via a 10 kohm pull-up and a 100 nF cap to VDD for reset noise immunity, per the Microchip datasheet. Avoid using ICSPDAT and ICSPCLK as high-frequency GPIO during debugging - they multiplex with RB6/RB7 and the ICD tool may drive them. When migrating from PIC16F676 firmware, remember the PIC16F677 has 256 B EEPROM and an enhanced USART, but the PIC16F676 has only 256 B EEPROM and no EUSART - verify peripheral usage before swapping.
Route the 20 MHz crystal traces (RA6/RA7) symmetrically and guard them with a ground pour to limit stray capacitance. If using the internal 8 MHz oscillator instead, leave RA6/RA7 as GPIO. Keep switching signals (PWM outputs, USART clocks) away from ADC analog inputs by at least 2 trace widths to limit crosstalk. Place the AVSS pin to a quiet ground via and avoid sharing it with switching return currents.
Compliance Information
RoHS and REACH compliant per Microchip product page. Not AEC-Q100 qualified - for automotive safety applications, use AEC-Q100-qualified PIC16F variants or higher. Lead-free matte-tin plating over nickel-palladium-gold.
