PIC17C44T-25/PT - 8-Bit 25MHz 16KB OTP MCU TQFP-44 | Microchip
MPN: PIC17C44T-25/PT ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.5 | $8.50 |
| 10 | $7.95 | $79.50 |
| 100 | $7.1 | $710.00 |
| 500 | $6.4 | $3,200.00 |
| 1,000 | $5.75 | $5,750.00 |
PIC17C44T-25/PT Overview
A microcontroller (MCU) is a single-chip computer containing a CPU core, program memory, data RAM, and peripheral set. Within the semiconductor taxonomy, MCUs belong to microcontrollers, then embedded processors, then logic ICs, then integrated circuits. The PIC17C family sits at the high-performance tier of Microchip's 8-bit portfolio, bridging toward PIC18 and dsPIC devices in instruction throughput while retaining 8-bit data paths.
Key features include a RISC architecture with 58 single-word instructions, an external oscillator interface supporting HS, XT, LP and RC modes, a 16-bit timer/counter with capture/compare/PWM capability, an 8-bit timer/counter, hardware USART, watchdog timer, power-on reset (POR), and brown-out reset (BOR). The OTP memory supports in-circuit programming via Microchip's ICSP protocol, simplifying firmware development and field updates.
The PIC17C44 architecture uses a 16-bit instruction word with Harvard bus separation between program and data memory, eliminating fetch bottlenecks. Each instruction cycle executes in 4 oscillator clocks, and the 25 MHz rating supports 121 ns instruction time. The device operates across 3.0 V to 5.5 V supply with commercial temperature grade (0C to +70C), drawing typically under 10 mA active.
Typical applications include industrial control systems, motor control, HVAC equipment, instrumentation, automotive body controllers, and consumer appliance controllers. The PWM and USART peripherals simplify variable-frequency drive and communication tasks.
When designing with this part, place a 0.1 uF decoupling capacitor within 5 mm of each VDD/VSS pair, and use ICSP connector access to all five programming pins (RB6, RB7, MCLR, VDD, VSS) to enable field re-flash even on production boards.
This page synthesizes distributor pricing, drop-in PIC17C44 family alternatives, and practical design notes not found in the standalone datasheet.
Drop-in alternatives for PIC17C44T-25/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 PIC17C44T-25/PT (same form factor and footprint) — differing in Core Architecture, Package, Instruction Cycle Time, Program Memory Size, Program Memory Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC17C44T-25I/PT
✅ Drop-In✓ In Stock
$6.08 / Unit
View Datasheet →PIC17C44-16I/PT
✅ Drop-In✓ In Stock
$4.65 / Unit
View Datasheet →PIC17C43T-25I/PQ
✅ Drop-In✓ In Stock
$13.5 / Unit
View Datasheet →PIC17C43T-25/PT
✅ Drop-In✓ In Stock
$4.75 / Unit
View Datasheet →PIC17C42A-25/PT
✅ Drop-In✓ In Stock
$5.55 / Unit
View Datasheet →PIC17C44T-25/PT Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC 8-bit RISC |
| Core Frequency | 25 MHz |
| Instruction Throughput | 8.25 MIPS (121 ns/instruction) |
| Instruction Set | 58 single-word instructions |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 16 KB (8K x 16 words) |
| Data RAM Size | 454 bytes |
| I/O Pins | 33 |
| Package | 44-pin TQFP (10x10 mm) |
| Mounting Type | Surface Mount |
| Supply Voltage | 3.0 V to 5.5 V |
| Operating Temperature | 0C to +70C (Commercial) |
| Timer/Counters | 1 x 16-bit, 1 x 8-bit |
| PWM Channels | Yes (capture/compare/PWM) |
| Communication | USART |
| Watchdog Timer | Yes |
| Power-On Reset / Brown-Out Reset | POR + BOR |
| ICSP In-Circuit Programming | Yes |
PIC17C44T-25/PT Pin Configuration
| Pin 1 | RC0 — Port C I/O pin 0 |
| Pin 2 | RC1 — Port C I/O pin 1 |
| Pin 3 | RC2 — Port C I/O pin 2 / PWM output |
| Pin 4 | RC3 — Port C I/O pin 3 |
| Pin 5 | RC4 — Port C I/O pin 4 |
| Pin 6 | RC5 — Port C I/O pin 5 |
| Pin 7 | RC6 — Port C I/O pin 6 / TX |
| Pin 8 | RC7 — Port C I/O pin 7 / RX |
| Pin 9 | RD0 — Port D I/O pin 0 |
| Pin 10 | RD1 — Port D I/O pin 1 |
| Pin 11 | RD2 — Port D I/O pin 2 |
| Pin 12 | RD3 — Port D I/O pin 3 |
| Pin 13 | RD4 — Port D I/O pin 4 |
| Pin 14 | RD5 — Port D I/O pin 5 |
| Pin 15 | RD6 — Port D I/O pin 6 |
| Pin 16 | RD7 — Port D I/O pin 7 |
| Pin 17 | VSS — Ground |
| Pin 18 | MCLR/VPP — Master Clear / Programming voltage |
| Pin 19 | OSC1 — Oscillator input |
| Pin 20 | OSC2 — Oscillator output |
| Pin 21 | RA0 — Port A I/O pin 0 |
| Pin 22 | RA1 — Port A I/O pin 1 |
| Pin 23 | RA2 — Port A I/O pin 2 |
| Pin 24 | RA3 — Port A I/O pin 3 |
| Pin 25 | RA4 — Port A I/O pin 4 |
| Pin 26 | RA5 — Port A I/O pin 5 |
| Pin 27 | RE0 — Port E I/O pin 0 |
| Pin 28 | RE1 — Port E I/O pin 1 |
| Pin 29 | RE2 — Port E I/O pin 2 |
| Pin 30 | VDD — Positive supply voltage |
| Pin 31 | VSS — Ground |
| Pin 32 | RB0 — Port B I/O pin 0 / INT |
| Pin 33 | RB1 — Port B I/O pin 1 |
| Pin 34 | RB2 — Port B I/O pin 2 |
| Pin 35 | RB3 — Port B I/O pin 3 |
| Pin 36 | RB4 — Port B I/O pin 4 |
| Pin 37 | RB5 — Port B I/O pin 5 |
| Pin 38 | RB6 — Port B I/O pin 6 / ICSP CLK |
| Pin 39 | RB7 — Port B I/O pin 7 / ICSP DAT |
| Pin 40 | VDD — Positive supply voltage |
| Pin 41 | VSS — Ground |
| Pin 42 | NC — Not connected |
| Pin 43 | NC — Not connected |
| Pin 44 | NC — Not connected |
Typical Applications
PIC17C44T-25/PT is suitable for 6 applications: Industrial Process Control, HVAC Equipment Controllers, Consumer Appliance Control, Automotive Body Controllers, Motor Control and PWM Drives, Test and Measurement Instrumentation.
Industrial Process Control
The PIC17C44T-25/PT fits industrial process controllers that require deterministic 8-bit performance with discrete I/O for sensors and relays. Its 25 MHz core (8.25 MIPS) handles PID loop math at 10 ms sample rates while the 33 I/O pins multiplex analog switches, opto-isolated inputs, and contactor outputs. The 16 KB OTP supports ladder-logic-equivalent C code for valve sequencing, tank-level control, and alarm prioritization. Brown-out reset prevents corruption during brown-out events on factory power rails, and the USART enables RS-485 communication with supervisory PLCs in distributed control systems.
Recommended
HVAC Equipment Controllers
The PIC17C44T-25/PT suits HVAC blower and damper controllers because the 16-bit CCP/PWM module produces precise variable-speed drive waveforms for ECM motors. The 25 MHz core executes state-machine logic for thermostat inputs (setpoint, mode, fan speed) and triac-fired outputs for compressor control. With 33 I/O, multiple temperature sensors and LCD displays connect directly without I/O expanders. The commercial 0C to +70C range matches indoor equipment environments; for outdoor condensing units, the I-suffix variant extends coverage to -40C to +85C.
Recommended
Consumer Appliance Control
The PIC17C44T-25/PT fits washing machines, dishwashers, and microwave oven controllers where 8-bit determinism and field-programmable memory are valuable. Its 16 KB OTP accommodates state machines for wash cycles, pump sequencing, and lid-lock interlocks while the PWM module drives motor speed and buzzer tones. The USART connects to inverter boards or sensor hubs, and 454 bytes of RAM buffer cycle parameters. Designers favor the TQFP-44 package for reflow-solderable consumer-grade assembly and the ICSP interface for factory firmware loading.
Recommended
Automotive Body Controllers
Although commercial-grade, the PIC17C44T-25/PT logic and pinout serve as a development vehicle for body-control modules. The 33 I/O pins handle door-lock actuators, window switches, lighting relays, and CAN-style messaging through the USART. The 25 MHz MIPS throughput debounces switch inputs and drives PWM dimming of interior lighting in real time. Production automotive programs use the PIC18 family with AEC-Q100 grade; the -25I/PT industrial variant is the closest drop-in for under-hood thermal stress without AEC qualification.
Recommended
Motor Control and PWM Drives
The PIC17C44T-25/PT directly drives brushed DC and stepper motors via its 16-bit CCP/PWM module, which provides up to 10-bit PWM resolution at typical switching frequencies. Its 8.25 MIPS throughput runs acceleration/deceleration ramps in software, freeing the PWM hardware to produce accurate duty cycles. The 16-bit timer/counter serves as a quadrature encoder input for closed-loop speed control. With 33 I/O available, H-bridge drivers, current-sense amplifiers, and brake-coil MOSFETs connect without external logic.
Recommended
Test and Measurement Instrumentation
The PIC17C44T-25/PT is well suited for handheld multimeter, clamp meter, and bench-instrument front-panel controllers. The 33 I/O pins scan keypads, drive 7-segment or graphical LCDs, and route analog multiplexer channels to ADCs. USART link to the ADC front-end transmits digitized readings to host PCs or printers. The 454-byte RAM buffers measurement tables, while the 16 KB OTP stores calibration constants, range tables, and unit-conversion code. Brown-out reset prevents corruption of calibration data during battery swaps in portable instruments.
Recommended
Recommended Products Summary
Engineering reference data for PIC17C44T-25/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC17C44T-25I/PT | PIC17C44-16I/PT | PIC17C43T-25I/PQ | PIC17C43T-25/PT | PIC17C42A-25/PT |
|---|---|---|---|---|---|---|
| Package | TQFP-44 (10x10 mm) | TQFP-44 (10x10 mm) - same | TQFP-44 - same | PQFP-44 - same class | TQFP-44 - same | TQFP-44 - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core Frequency | 25 MHz | 25 MHz | 16 MHz | 25 MHz | 25 MHz | 25 MHz |
| Program Memory | 16 KB OTP | 16 KB OTP | 16 KB OTP | 8 KB OTP | 8 KB OTP | 4 KB OTP |
| Data RAM | 454 bytes | 454 bytes | 454 bytes | 454 bytes | 454 bytes | 232 bytes |
| I/O Pins | 33 | 33 | 33 | 33 | 33 | 33 |
| Operating Temperature | 0C to +70C (Commercial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | 0C to +70C (Commercial) | 0C to +70C (Commercial) |
| Supply Voltage | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V |
| Lifecycle Status | NRND | NRND | NRND | NRND | NRND | NRND |
Key Differentiators
- Highest OTP program memory in PIC17C family at TQFP-44 (vs PIC17C43T-25/PT)
- Maximum 25 MHz core speed (vs PIC17C44-16I/PT)
- 454-byte RAM with 16 KB OTP (vs PIC17C42A-25/PT)
Design Notes
Place a 0.1 uF decoupling capacitor within 5 mm of every VDD/VSS pair on the PIC17C44T-25/PT, plus a bulk 10 uF tantalum or ceramic at the board's power entry. The device draws up to 10 mA active at 25 MHz, so star-ground topology prevents digital switching noise from coupling into analog references. Tie unused I/O pins to defined logic levels (VDD or VSS) to reduce shoot-through current during transitions.
Route the oscillator traces (OSC1, OSCC2) symmetrically and keep them under 10 mm. Use a ground ring around the crystal to minimize EMI pickup. The TQFP-44 package has a thermal pad on the underside; connect it to a copper pour on the top layer tied to VSS for improved thermal dissipation, even though the part's active current is modest. Keep high-speed signals (PWM, USART) away from the analog AVSS/AVDD pins if the board mixes analog and digital sections.
Do not exceed 25 MHz on the OSC1 input, or instruction timing becomes invalid. Brown-out reset must be enabled in configuration bits for robust field operation, especially with inductive loads that may sag the rail. The ICSP interface requires a 5-pin connector (MCLR, RB6, RB7, VDD, VSS); forgetting VSS on the programming header is a common reason production-line programming fails. Finally, OTP memory is one-time programmable only; do not rely on it for in-system firmware updates - design a migration path to flash-based PIC18F or PIC24 for new products.
Compliance Information
Compliance status not available in verified web data; RoHS, REACH, lead-free, halogen-free, and conflict-minerals status require direct consultation of the Microchip product declaration or material composition sheet. The part is NRND per Microchip's product page.