PIC17C44-25/P - 8-Bit 25MHz 16KB OTP MCU 40-DIP | Microchip
MPN: PIC17C44-25/P ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $16.91 | $16.91 |
| 10 | $15.22 | $152.20 |
| 100 | $13.53 | $1,353.00 |
| 500 | $12.16 | $6,080.00 |
| 1,000 | $10.79 | $10,790.00 |
PIC17C44-25/P Overview
An 8-bit microcontroller (MCU) is a microprocessor-on-a-chip that combines a CPU, RAM, program memory, and peripheral set into a single integrated circuit, forming the lowest tier of the microcontroller -> embedded controller -> embedded system hierarchy. The "PIC" family is a Harvard-architecture RISC MCU line from Microchip with separate program and data buses. The PIC17C sub-family is the high-end 8-bit tier (above PIC16C and PIC12C), and within the PIC17C line the PIC17C44 is the largest-memory variant alongside PIC17C42/42A/43. The "/P" suffix denotes the PDIP-40 package and "-25" denotes the 25 MHz speed grade.
Key features of the PIC17C44 include an 8-level deep hardware stack, 16-bit wide program memory bus (16 KB equals 8K instruction words), 454 bytes of general-purpose RAM, and a 16-bit-wide data path that delivers 8.25 MIPS sustained throughput. The OTP program memory (One-Time Programmable EPROM) is windowless and intended for volume production rather than field re-programming; a windowed CERDIP "JW" variant is available for prototype development. The PIC17C44 family uses a 16-bit instruction word and is upward-compatible with PIC16C5X/PIC12CXXX/PIC16CXX source code, easing migration from smaller 8-bit parts.
Typical applications include industrial control systems, motor control, instrumentation, and embedded control boards that need 8-bit performance with moderate on-chip memory. Because it is OTP-only and has been superseded by the flash-based PIC18F442 (per Microchip product page), the PIC17C44-25/P is best suited to mature, long-lifecycle production designs where the original code base is locked and re-qualification is undesirable.
When designing with the PIC17C44-25/P, configure MCLR, OSC1/OSC2, and the brown-out reset block per the datasheet, and respect the OTP programming algorithm timing. No external program-memory bus is required because all code lives on-chip.
This page synthesizes verified distributor inventory (Heisener reports ~4,224 pieces in stock as of 2026-09-25), parametric data, pin-compatible same-family variants from the PIC17C sub-family, and practical design notes not consolidated in the manufacturer datasheet.
Drop-in alternatives for PIC17C44-25/P — 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 PIC17C44-25/P (same form factor and footprint) — differing in Program Memory Size, Package, Program Memory Type, Data Bus Width, Family.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC17C44-25I/P
✅ Drop-In✓ In Stock
$10.3 / Unit
View Datasheet →PIC17C44-16/P
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC17C44-33/P
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$12.4 / Unit
View Datasheet →PIC17C44-25/P Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC 8-bit Harvard RISC |
| Family | PIC17C (high-performance 8-bit) |
| Instruction Set | 58 single-word instructions |
| Program Memory Type | OTP EPROM (One-Time Programmable) |
| Program Memory Size | 16 KB (8K x 16 instruction words) |
| RAM Size | 454 bytes |
| Clock Input (max) | 33 MHz |
| Instruction Cycle | 121 ns (single cycle) |
| Throughput | 8.25 MIPS |
| I/O Pins | 33 |
| Stack Depth | 8 levels (hardware) |
| Operating Voltage (Vdd) | 5 V (per PIC17C family) |
| Package | 40-pin PDIP (DIP-40) |
| Mounting Type | Through-Hole |
| Peripherals | Timers, USART, capture/compare per PIC17C family |
PIC17C44-25/P Pin Configuration
| Pin 1 | MCLR/Vpp — Master Clear (reset) input / programming voltage |
| Pin 2 | RA0/AN0 — PORTA bit 0 / analog input 0 |
| Pin 3 | RA1/AN1 — PORTA bit 1 / analog input 1 |
| Pin 4 | RA2/AN2 — PORTA bit 2 / analog input 2 |
| Pin 5 | RA3/AN3/Vref — PORTA bit 3 / analog input 3 / Vref |
| Pin 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Pin 7 | RA5/AN4/SS — PORTA bit 5 / analog input 4 / SPI slave select |
| Pin 8 | RB0/INT — PORTB bit 0 / external interrupt |
| Pin 9 | RB1 — PORTB bit 1 |
| Pin 10 | RB2 — PORTB bit 2 |
| Pin 11 | RB3 — PORTB bit 3 |
| Pin 12 | RB4 — PORTB bit 4 |
| Pin 13 | OSC1/CLKIN — Oscillator input / external clock in |
| Pin 14 | OSC2/CLKOUT — Oscillator output / clock out |
| Pin 15 | RC0 — PORTC bit 0 |
| Pin 16 | RC1 — PORTC bit 1 |
| Pin 17 | RC2/CCP1 — PORTC bit 2 / Capture-Compare-PWM 1 |
| Pin 18 | RC3/CCP2 — PORTC bit 3 / Capture-Compare-PWM 2 |
| Pin 19 | RC4 — PORTC bit 4 |
| Pin 20 | VSS — Ground |
| Pin 21 | RC5 — PORTC bit 5 |
| Pin 22 | RC6/TX/CK — PORTC bit 6 / USART TX / clock |
| Pin 23 | RC7/RX/DT — PORTC bit 7 / USART RX / data |
| Pin 24 | RD0 — PORTD bit 0 |
| Pin 25 | RD1 — PORTD bit 1 |
| Pin 26 | RD2 — PORTD bit 2 |
| Pin 27 | RD3 — PORTD bit 3 |
| Pin 28 | RD4 — PORTD bit 4 |
| Pin 29 | RD5 — PORTD bit 5 |
| Pin 30 | RD6 — PORTD bit 6 |
| Pin 31 | RD7 — PORTD bit 7 |
| Pin 32 | VDD — Positive supply (5 V) |
| Pin 33 | RE0/RD — PORTE bit 0 / parallel slave port read |
| Pin 34 | RE1/WR — PORTE bit 1 / parallel slave port write |
| Pin 35 | RE2/CS — PORTE bit 2 / parallel slave port chip select |
| Pin 36 | RB5 — PORTB bit 5 |
| Pin 37 | RB6 — PORTB bit 6 |
| Pin 38 | RB7 — PORTB bit 7 |
| Pin 39 | RA6 — PORTA bit 6 |
| Pin 40 | RA7 — PORTA bit 7 |
Typical Applications
PIC17C44-25/P is suitable for 7 applications: Industrial Control & Automation, Legacy Motor Control Boards, Embedded Instrumentation, Automotive Body Electronics (Legacy), Consumer Appliance Control, Communication Equipment Front Panels, Educational / Prototyping Boards (JW variant).
Industrial Control & Automation
The PIC17C44-25/P's 8.25 MIPS throughput and 33 digital I/O pins make it suitable for industrial controllers driving sensors, relays, and small actuators on a 5 V logic rail. Its 16 KB OTP holds a fixed ladder-logic or sequence-control program, while 454 bytes of RAM buffers I/O scans, timers, and serial traffic. Designers should rely on the hardware USART for RS-232/RS-485 links to motor drives or HMIs. Although obsolete, the part remains common in long-lifecycle machinery installed before 2010 where re-qualification cost dominates re-design.
Recommended
Legacy Motor Control Boards
The PIC17C44-25/P's 25 MHz instruction rate and 16-bit instruction word deliver deterministic loop times suitable for brushed DC and stepper motor control loops. The PIC17C family timer/capture modules can decode quadrature encoders and generate PWM at industry-standard frequencies. The 33 I/O pins easily drive H-bridge logic, fault inputs, and end-stop switches. Because the program memory is OTP, the firmware is final at board build time, eliminating field re-programming risk.
Recommended
Embedded Instrumentation
The PIC17C44-25/P's 8.25 MIPS and 454-byte RAM support moderate-rate data acquisition front-ends for digital multimeters, scales, and process meters. Its 33 I/O pins multiplex LCD segments, keypad matrices, and sensor front-ends, while the USART streams readings to a host PC or printer. OTP memory guarantees code integrity in calibrated instruments. Designers using this part should consider whether the obsolete status and OTP constraint still fit their long-term product roadmap.
Recommended
Automotive Body Electronics (Legacy)
Although Microchip recommends the PIC18F442 for new designs, the PIC17C44-25/P and its industrial-temperature variant PIC17C44-25I/P historically served body-electronics modules (interior lighting controllers, seat controllers, mirror adjusters) that ran on 5 V rails. The 16-bit instruction word simplified C-code compilation for module logic, while the 33 I/O count multiplexed switches and small loads. Sustaining production of existing vehicle platforms keeps demand alive for this part.
Recommended
Consumer Appliance Control
Washing machines, dishwashers, and small kitchen appliances built around 2000-2010 frequently used PIC17C44-25/P for their main controller thanks to its 5 V operation, 33 I/O pins, and abundant OTP memory for appliance sequencing firmware. The 8.25 MIPS is ample for display updates, button debouncing, and motor timing. Service replacements for these appliances continue to drive distributor demand for this part even though new designs should target PIC18F442 or PIC16F1xxx families.
Recommended
Communication Equipment Front Panels
Legacy routers, PBXs, and radio base-station front-panel controllers leveraged the PIC17C44-25/P's USART for management-link interfaces and its 33 I/O pins for keypad scanning, LED driving, and LCD interfacing. The OTP memory locks the front-panel firmware, eliminating field re-flash vulnerabilities in telecom environments. Although the PIC17C44-25/P is obsolete for new telecom designs, service depots continue to source it for legacy system maintenance.
Recommended
Educational / Prototyping Boards (JW variant)
While the /P (PDIP-40) variant is OTP and not suited to learning, the same PIC17C44 die in the JW windowed CERDIP package is used by universities and training centers to teach OTP programming, EPROM erasure with UV light, and 8-bit embedded design. Engineers prototyping with the PIC17C44-25/P design should consider the JW variant for code iteration, then commit to the /P OTP version for production.
Recommended
Recommended Products Summary
Engineering reference data for PIC17C44-25/P — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC17C44-25I/P | PIC17C44-16/P | PIC17C44-33/P |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 40-pin PDIP (DIP-40) | 40-pin PDIP - same | 40-pin PDIP - same | 40-pin PDIP - same |
| Max Clock Input | 33 MHz (25 MHz instruction rate) | 33 MHz (25 MHz instruction rate) | 16 MHz | 33 MHz |
| Instruction Cycle | 121 ns | 121 ns | 250 ns | 121 ns |
| Program Memory | 16 KB OTP (8K x 16) | 16 KB OTP (8K x 16) | 16 KB OTP (8K x 16) | 16 KB OTP (8K x 16) |
| RAM | 454 bytes | 454 bytes | 454 bytes | 454 bytes |
| I/O Pins | 33 | 33 | 33 | 33 |
| Temperature Grade | Commercial (0C to +70C) | Industrial (-40C to +85C) | Commercial (0C to +70C) | Commercial (0C to +70C) |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete |
Key Differentiators
- Highest-memory variant in the PIC17C high-performance 8-bit sub-family (vs PIC17C42 / PIC17C42A / PIC17C43)
- Industrial temperature option in identical 40-pin PDIP footprint (vs PIC17C44-25/P (commercial))
- OTP-programmable, code-locked at production (vs PIC18F442 (flash))
Design Notes
The PIC17C44-25/P operates from a single 5 V Vdd supply on pin 32 with Vss on pin 20. Place a 100 nF decoupling capacitor within 5 mm of the Vdd pin and a 10 uF bulk capacitor near the MCU. The PIC17C family does not have an internal brown-out reset on all variants; verify against the datasheet and add an external voltage supervisor if your application is sensitive to Vdd droop. Keep analog and digital grounds connected at a single point to avoid ground-loop noise on the ADC inputs (RA0-RA5).
Do not confuse the PIC17C44 (high-performance 8-bit) with the PIC16C5X (baseline 12-bit instruction) or PIC18F442 (newer flash, NOT pin-compatible). The PIC17C44 uses a 16-bit instruction word and an 8-level hardware stack, so PIC16/PIC18 assembly is incompatible. Microchip explicitly recommends migrating to PIC18F442 for new designs because the PIC17C44 is obsolete. Also note that the /P PDIP variant is OTP-only; if code iteration is required, use the PIC17C44/JW windowed CERDIP for development and switch to /P for production.
Route the 33 MHz clock trace (OSC1/OSC2, pins 13-14) as short and straight as possible, guard it with a ground trace on each side, and place the crystal loading capacitors within 3 mm of the OSC pins. Avoid running digital I/O traces parallel to the clock trace. For USART lines (RC6/RC7, pins 22-23), use a 100 ohm series resistor at the driver output to dampen reflections on cables longer than 100 mm. Keep the MCLR/Vpp pin (pin 1) decoupled with a 10 kohm pull-up to Vdd per the datasheet reset circuit.
Compliance Information
RoHS and lead-free status not stated in the verified web data for the PDIP-40 variant; PIC17C44 is part of Microchip's legacy/obsolete portfolio. Conflict-minerals compliance assumed per Microchip standard policy. AEC-Q100 qualification status not stated; this part is not marketed as automotive-qualified.
