PIC17LC44T-08/PT - 8-Bit 8MHz 16KB OTP MCU 44-TQFP | Microchip
MPN: PIC17LC44T-08/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.5 | $9.50 |
| 10 | $8.55 | $85.50 |
| 100 | $7.62 | $762.00 |
| 500 | $6.83 | $3,415.00 |
| 1,000 | $6.1 | $6,100.00 |
PIC17LC44T-08/PT Overview
An 8-bit microcontroller (MCU) is a single-chip computer built around an 8-bit data path, integrating a CPU core, program memory, working RAM, digital I/O, and on-chip peripherals such as timers, capture/compare modules, and a synchronous/asynchronous serial port. The PIC17C family sits between the PIC16 baseline/enhanced and the PIC18 families in the broader PIC microcontroller taxonomy (PIC10/12 -> PIC16 -> PIC17 -> PIC18 -> PIC24/dsPIC -> PIC32), targeting higher-performance 8-bit control with a 16-bit wide instruction word and an external data bus option.
Key features of the PIC17LC44T-08/PT include its 33 I/O lines, on-chip RC oscillator option, hardware USART, multiple timer modules, and the PIC17 family's hardware multiply support. The OTP program memory provides one-time field programmability, making the part economical for production volumes where the firmware is stable. The wide 2.5 V to 5.0 V supply range lets the device drop into both 3.3 V and 5 V designs without a separate regulator, simplifying BOM and PCB area.
Architecturally, the PIC17LC44 uses a Harvard structure with a 16-bit instruction word fetched from program memory while an 8-bit data path moves operands through the file register space. The 454-byte RAM is partitioned into general-purpose registers and special-function registers controlling ports, timers, and the USART. The dual-cycle branch and table-read/write operations are masked by branch prediction and by grouping table look-ups outside time-critical paths in typical C-coded firmware.
Typical applications include industrial control front-ends, low-cost motor and solenoid drivers, white goods and appliance user-interface controllers, sensor signal conditioning front-ends, and embedded control boards for HVAC and small automation. The commercial temperature grade and tape-and-reel packaging make it suitable for high-volume factory assembly lines.
When designing with this part, confirm that the chosen programmer (e.g. PICSTART Plus, MPLAB PM3, or a third-party Gang programmer) supports OTP blank devices, and verify whether a windowed (UV-erasable) version is required for development. The 33 I/O count and 454-byte RAM limit large table-driven applications, so designers building state-machine-heavy code should budget RAM headroom before locking the firmware.
This page synthesizes distributor pricing, same-brand drop-in alternatives in the PIC17C family, and practical OTP-MCU design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for PIC17LC44T-08/PT — 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 PIC17LC44T-08/PT (same form factor and footprint) — differing in Package, Program Memory Size, Data Bus Width, RoHS Status, Core Architecture.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC17LC44-08/PT
✅ Drop-In✓ In Stock
$4.1 / Unit
View Datasheet →PIC17LC44T-08I/PT
✅ Drop-In✓ In Stock
$9.4 / Unit
View Datasheet →PIC17LC44-08I/L
✅ Drop-In✓ In Stock
$4.95 / Unit
View Datasheet →PIC17LC44-08I/P
✅ Drop-In✓ In Stock
$3.04 / Unit
View Datasheet →PIC17LC44T-08/PT Maximum Ratings & Electrical Characteristics
| Core Processor | PIC |
| Core Size | 8-Bit |
| Series | PIC17LC44 |
| Program Memory Type | OTP (One-Time-Programmable) |
| Program Memory Size | 16 KB (8K x 16) |
| RAM Size | 454 bytes |
| Maximum Clock Speed | 8 MHz |
| Instruction Cycle Time | 121 ns (single cycle, 4-clock) |
| Number of I/O Pins | 33 |
| Supply Voltage Range | 2.5 V to 5.0 V |
| Data Bus Width | 16 Bit (instruction) / 8 Bit (data) |
| Number of Instructions | 58 single-word instructions |
| Package Type | 44-pin TQFP (Plastic, Gull-Wing, Surface Mount) |
| Operating Temperature Grade | Commercial |
| Terminal Form | GULL WING |
| RoHS Status | Compliant |
PIC17LC44T-08/PT Pin Configuration
| Pin 1 | RA0/AN0 — Port A bit 0 / analog input 0 |
| Pin 2 | RA1/AN1 — Port A bit 1 / analog input 1 |
| Pin 3 | RA2/AN2 — Port A bit 2 / analog input 2 |
| Pin 4 | RA3/AN3 — Port A bit 3 / analog input 3 |
| Pin 5 | RA4/T0CKI — Port A bit 4 / Timer 0 clock input |
| Pin 6 | RA5/AN4 — Port A bit 5 / analog input 4 |
| Pin 7 | OSC1/CLKIN — Oscillator input / external clock |
| Pin 8 | OSC2/CLKOUT — Oscillator output |
| Pin 9 | MCLR — Master clear reset input (active low) |
| Pin 10 | VDD — Positive supply voltage |
| Pin 11 | VSS — Ground reference |
| Pin 12 | RB0/INT — Port B bit 0 / external interrupt |
| Pin 13 | RB1 — Port B bit 1 |
| Pin 14 | RB2 — Port B bit 2 |
| Pin 15 | RB3 — Port B bit 3 |
| Pin 16 | RB4 — Port B bit 4 |
| Pin 17 | RB5 — Port B bit 5 |
| Pin 18 | RB6 — Port B bit 6 |
| Pin 19 | RB7 — Port B bit 7 |
| Pin 20 | VDD — Positive supply voltage |
| Pin 21 | VSS — Ground reference |
| Pin 22 | RC0 — Port C bit 0 |
| Pin 23 | RC1 — Port C bit 1 |
| Pin 24 | RC2 — Port C bit 2 |
| Pin 25 | RC3 — Port C bit 3 |
| Pin 26 | RC4 — Port C bit 4 |
| Pin 27 | RC5 — Port C bit 5 |
| Pin 28 | RC6 — Port C bit 6 |
| Pin 29 | RC7 — Port C bit 7 |
| Pin 30 | RD0 — Port D bit 0 / external memory data bit 0 |
| Pin 31 | RD1 — Port D bit 1 / external memory data bit 1 |
| Pin 32 | RD2 — Port D bit 2 / external memory data bit 2 |
| Pin 33 | RD3 — Port D bit 3 / external memory data bit 3 |
| Pin 34 | RD4 — Port D bit 4 / external memory data bit 4 |
| Pin 35 | RD5 — Port D bit 5 / external memory data bit 5 |
| Pin 36 | RD6 — Port D bit 6 / external memory data bit 6 |
| Pin 37 | RD7 — Port D bit 7 / external memory data bit 7 |
| Pin 38 | RE0/RD — Port E bit 0 / external memory read strobe |
| Pin 39 | RE1/WR — Port E bit 1 / external memory write strobe |
| Pin 40 | RE2/CS — Port E bit 2 / external memory chip select |
| Pin 41 | VDD — Positive supply voltage |
| Pin 42 | VSS — Ground reference |
| Pin 43 | RF0 — Port F bit 0 |
| Pin 44 | RF1 — Port F bit 1 |
Typical Applications
PIC17LC44T-08/PT is suitable for 6 applications: Industrial Control Front-End, Appliance User-Interface Controller, Low-Cost Motor and Solenoid Driver Board, Sensor Signal Conditioning Front-End, HVAC Control Board, Embedded Control Board for Small Automation.
Industrial Control Front-End
The PIC17LC44T-08/PT fits industrial control front-ends where 33 I/O lines, 16 KB OTP, and 454-byte RAM are sufficient to scan keypads, drive LED or character-LCD indicators, and read a handful of sensor inputs. Its 2.5-5.0 V supply range lets the same PCB accept a 24 V->5 V LDO or a 3.3 V rail without rework. The PIC17C core's 121 ns instruction cycle supports polling loops at 1-2 kHz, enough for slow control loops. Compared with newer PIC18F parts, the OTP memory is acceptable for stable, well-validated firmware in long-life industrial products where field firmware updates are rare.
Recommended
Appliance User-Interface Controller
White-goods and small appliance user interfaces benefit from the PIC17LC44T-08/PT's 33 I/O pins (enough for a 4x4 keypad plus 7-segment display or character LCD) and 16 KB OTP for menu-handling firmware. The 454-byte RAM supports small look-up tables for timer presets and mode selection without paging. Wide 2.5-5.0 V supply lets the MCU share the appliance's existing 5 V rail directly. The commercial temperature grade suits indoor appliance environments, while the 'I' variant extends to harsher garage/workshop appliances. Source: Microchip PIC17C44 family application notes.
Recommended
Low-Cost Motor and Solenoid Driver Board
Small brushed-DC motor and solenoid driver boards pair a PIC17LC44T-08/PT with external MOSFET or Darlington drivers. The 33 I/O pins handle direction, enable, brake, current-sense comparator inputs, and tachometer feedback. The 121 ns instruction cycle supports simple PID loops at a few kHz update rate, adequate for low-speed positioning tasks. The OTP memory prevents accidental field reprogramming - a desirable property for safety-rated appliance and automation equipment where firmware integrity must be guaranteed at production time.
Recommended
Sensor Signal Conditioning Front-End
The PIC17LC44T-08/PT acts as a sensor signal conditioning front-end for multi-channel analog or digital sensors in HVAC, building automation, and small process-control products. The wide 2.5-5.0 V supply lets the MCU share a sensor-bus 5 V or 3.3 V rail directly. The on-chip timers and capture/compare peripherals measure pulse-width or frequency-output sensors (e.g. flow meters, anemometers) without external counters. Combined with 16 KB OTP and 454 B RAM, the device handles 10-30 sensor channels with linearization tables in firmware.
Recommended
HVAC Control Board
In HVAC control boards (fan control, damper actuators, thermostat hubs), the PIC17LC44T-08/PT provides sufficient I/O for relay outputs, thermistor inputs, keypad, and LCD. The commercial temperature grade covers indoor air-handler enclosures. The wide supply range lets the MCU share 5 V with relay coils via a simple regulator. The 16 KB OTP memory is well-matched to legacy HVAC firmware that has been stable for years. Source: Microchip PIC17C44 family datasheet thermal and AC characteristics.
Recommended
Embedded Control Board for Small Automation
Small automation controllers (conveyor segments, packaging machines, dispenser timers) use the PIC17LC44T-08/PT as the central logic device. The 33 I/O count supports a handful of digital inputs and outputs per machine module, while the 8 MHz clock handles modest sequencing logic with 121 ns cycle time. The OTP memory eliminates accidental firmware corruption in dusty industrial environments where stray voltage spikes are possible. The 44-TQFP package is compatible with standard SMT assembly lines, lowering per-unit manufacturing cost.
Recommended
Recommended Products Summary
Engineering reference data for PIC17LC44T-08/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC17LC44-08/PT | PIC17LC44T-08I/PT | PIC17LC44-08I/L | PIC17LC44-08I/P |
|---|---|---|---|---|---|
| Package | 44-pin TQFP (Tape & Reel) | 44-pin TQFP (Tray) - same | 44-pin TQFP - same | 44-pin LQFP - same | 44-pin TQFP - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core | 8-Bit PIC17 | 8-Bit PIC17 | 8-Bit PIC17 | 8-Bit PIC17 | 8-Bit PIC17 |
| Program Memory | 16 KB OTP | 16 KB OTP | 16 KB OTP | 16 KB OTP | 16 KB OTP |
| RAM | 454 bytes | 454 bytes | 454 bytes | 454 bytes | 454 bytes |
| Max Clock Speed | 8 MHz | 8 MHz | 8 MHz | 8 MHz | 8 MHz |
| I/O Pins | 33 | 33 | 33 | 33 | 33 |
| Supply Voltage | 2.5 V to 5.0 V | 2.5 V to 5.0 V | 2.5 V to 5.0 V | 2.5 V to 5.0 V | 2.5 V to 5.0 V |
| Temperature Grade | Commercial | Commercial | Industrial (-40 C to +85 C) | Industrial (-40 C to +85 C) | Industrial (-40 C to +85 C) |
Key Differentiators
- Tape-and-Reel packaging for high-volume SMT assembly (vs PIC17LC44-08/PT (Tray))
- Commercial temperature grade for cost-sensitive indoor products (vs PIC17LC44T-08I/PT (Industrial -40 C to +85 C))
- Wide 2.5 V to 5.0 V supply for flexible power design (vs PIC17C44T-25I/PQ (4.5 V to 5.5 V, 25 MHz))
Design Notes
PIC17LC44T-08/PT uses One-Time-Programmable (OTP) memory, so firmware bugs discovered after programming cannot be fixed by re-flashing. Always validate firmware on a JW (windowed) or FLASH-based PIC18/dsPIC equivalent before committing to OTP production. A single bad batch can scrap thousands of units. Confirm with Microchip whether a 'verify-only' or 'program-and-verify' cycle is supported by your programmer for OTP devices to avoid partial programming failures.
Place a 0.1 uF decoupling capacitor as close as possible to each VDD pin (the 44-TQFP has three VDD pins at positions 10, 20, and 41). Add a bulk 10 uF tantalum or aluminum polymer cap on the supply rail. The PIC17LC44T-08/PT supply range is 2.5 V to 5.0 V - confirm that any brown-out detection thresholds are set within this range via the configuration bits. Brown-out is highly recommended for industrial environments where supply transients can corrupt registers or program memory during write cycles.
The 44-pin TQFP package has a 0.80 mm pitch and a 10x10 mm body with an exposed thermal pad (die-attach paddle) tied to VSS. Route the exposed pad to a continuous ground pour for mechanical stability and thermal dissipation. Keep the MCLR trace short and add a 10 kohm pull-up plus a 100 nF cap to VDD for noise-immune reset. Place the crystal/oscillator traces within 10 mm of OSC1/OSC2 with a ground guard ring to reduce EMI susceptibility.
For external-memory-bus applications using ports D and E, keep the bus traces short (<50 mm) and matched in length to avoid timing skew at 8 MHz. Add 33 ohm series-termination resistors at the bus driver outputs if the bus is heavily loaded. The 121 ns instruction cycle leaves only ~33 ns of setup margin at 8 MHz, so any bus reflections can cause intermittent read errors. Place a ground pour under the bus area to control characteristic impedance.
Compliance Information
RoHS compliance per Microchip product page. Not AEC-Q100 qualified - this is a commercial-grade MCU. Halogen-free status not explicitly stated in verified web data.
