PIC17C43-25E/L - 8-bit 25MHz OTP MCU 8KB | Microchip
MPN: PIC17C43-25E/L ⚠ Last Time Buy| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $18.95 | $18.95 |
| 10 | $16.85 | $168.50 |
| 100 | $14.42 | $1,442.00 |
| 500 | $12.1 | $6,050.00 |
| 1,000 | $9.78 | $9,780.00 |
PIC17C43-25E/L Overview
A microcontroller (MCU) is a single-chip computer containing a CPU, non-volatile program memory (ROM/Flash/OTP), volatile data memory (RAM), and integrated peripherals such as timers, communication controllers, and I/O ports. The PIC17C family sits above the entry-level PIC16C5X in Microchip's 8-bit roadmap and is upward-compatible with PIC12CXXX, PIC16CXX, and PIC16C5X instruction subsets. The PIC17C43 specifically belongs to the original PIC17C4X product line of high-pin-count, performance-oriented 8-bit controllers targeting motor control, instrumentation, and industrial automation subsystems.
Key features of the PIC17C43 include a Harvard RISC architecture with only 58 single-word instructions, hardware multiply and divide support, a Watchdog Timer (WDT) with on-chip RC oscillator, Power-On Reset (POR), brown-out detection, an 8-bit Timer0 with external event counter, multi-channel Capture/Compare/PWM (CCP) peripherals, a Universal Synchronous/Asynchronous Receiver/Transmitter (USART) for serial communication, and parallel slave port functionality. The 33 digital I/O pins share package pins with peripheral functions and analog comparator inputs.
The PIC17C43 architecture combines a 16-bit-wide instruction word with an 8-bit datapath, giving 14-bit program-word addressing plus enhanced byte-handling efficiency over the PIC16C series. On-chip peripherals are individually enabled through register bits, allowing unused peripherals to remain inactive to conserve supply current. The PIC17C43 was later superseded by the flash-based PIC18F family, with Microchip explicitly recommending PIC18F4220 as the migration target for new designs and legacy OTP support. Per the verified product page, Microchip's official position is that 'a newer device is available. Please consider PIC18F4220.'
Typical applications include industrial motor control drives, HVAC controllers, instrument panels, security alarm panels, smart sensor nodes, and embedded control boards requiring 33+ general-purpose I/Os. The extended temperature range extends operating capability into factory and outdoor cabinet installations. The PLCC-44 surface-mount package with J-leads is also friendly to socketed prototyping and field replacement.
When designing in this part, note that OTP memory cannot be re-programmed, so firmware should be finalized before committing to the silicon. Designers should validate code in a windowed (JW-package) PIC17C43 or in the recommended PIC18F4220 successor before production mask orders. Always confirm availability with the franchised distributor because Microchip has issued end-of-life notifications for several PIC17C43 speed grades.
This page synthesizes current distributor inventory, same-package drop-in alternatives (PIC17C43 speed grades and PIC17C42A variants), the Microchip-recommended PIC18F4220 migration target, and practical design notes not duplicated on the manufacturer datasheet.
Drop-in alternatives for PIC17C43-25E/L — 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 PIC17C43-25E/L (same form factor and footprint) — differing in Package, Operating Temperature, Core Architecture, Program Memory Size, Program Memory Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC17C43-25/L
✅ Drop-In✓ In Stock
$8.75 / Unit
View Datasheet →PIC17C43-33/L
✅ Drop-In✓ In Stock
$8.95 / Unit
View Datasheet →PIC17C43-16I/PQ
✅ Drop-In✓ In Stock
$4.82 / Unit
View Datasheet →PIC17C43-16/L
✅ Drop-In✓ In Stock
$5.1 / Unit
View Datasheet →PIC17C43-16E/P
✅ Drop-In✓ In Stock
$8.4 / Unit
View Datasheet →PIC17C42A-33/PT
✅ Drop-In✓ In Stock
$9.65 / Unit
View Datasheet →PIC17C43-25E/L Maximum Ratings & Electrical Characteristics
| Manufacturer | Microchip Technology |
| Product Family | PIC 17C |
| Core Architecture | 8-bit Harvard RISC |
| Instruction Set Size | 58 single-word instructions |
| Maximum Clock Frequency | 25 MHz |
| Performance (MIPS) | 8.25 MIPS |
| Instruction Execution Time | 121 ns |
| Program Memory Type | OTP (One-Time-Programmable) |
| Program Memory Size | 8 KB (4K x 16 words) |
| RAM Size | 454 bytes |
| Number of I/O Pins | 33 |
| Package Type | 44-PLCC (J-Lead) |
| Package Dimensions | 16.59 mm x 16.59 mm |
| Mounting Type | Surface Mount |
| Oscillator Type | External |
| Operating Temperature Range | -40C to +125C (E suffix, extended) |
| Peripherals | UART/USART, PWM, WDT, POR, Capture/Compare/PWM (CCP), 8-bit Timer0 |
| Communication Interfaces | USART, Parallel Slave Port |
PIC17C43-25E/L Pin Configuration
| Pin 1 | OSC1 — External oscillator input (crystal/ceramic resonator) |
| Pin 2 | OSC2 — External oscillator output |
| Pin 3 | MCLR — Master clear reset input (active low) |
| Pin 4 | RA0/AN0 — PORTA bit 0 / analog comparator input 0 |
| Pin 5 | RA1/AN1 — PORTA bit 1 / analog comparator input 1 |
| Pin 6 | RA2/AN2 — PORTA bit 2 / analog comparator input 2 |
| Pin 7 | RA3/AN3 — PORTA bit 3 / analog comparator input 3 |
| Pin 8 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Pin 9 | RA5/SS — PORTA bit 5 / slave select input |
| Pin 10 | VSS — Ground reference |
| Pin 11 | VDD — Positive supply voltage |
| Pin 12 | RB0/INT — PORTB bit 0 / external interrupt input |
| Pin 13 | RB1 — PORTB bit 1 |
| Pin 14 | RB2 — PORTB bit 2 |
| Pin 15 | RB3/CCP1 — PORTB bit 3 / Capture-Compare-PWM channel 1 |
| Pin 16 | RB4 — PORTB bit 4 |
| Pin 17 | RB5 — PORTB bit 5 |
| Pin 18 | RB6/CCP2 — PORTB bit 6 / Capture-Compare-PWM channel 2 |
| Pin 19 | RB7 — PORTB bit 7 |
| Pin 20 | RC0 — PORTC bit 0 |
| Pin 21 | RC1 — PORTC bit 1 |
| Pin 22 | RC2/CCP3 — PORTC bit 2 / Capture-Compare-PWM channel 3 |
| Pin 23 | RC3 — PORTC bit 3 |
| Pin 24 | RC4 — PORTC bit 4 |
| Pin 25 | RC5 — PORTC bit 5 |
| Pin 26 | RC6/TX — PORTC bit 6 / USART transmit |
| Pin 27 | RC7/RX — PORTC bit 7 / USART receive |
| Pin 28 | VSS — Ground reference |
| Pin 29 | VDD — Positive supply voltage |
| Pin 30 | RD0 — PORTD bit 0 / parallel slave port data bit 0 |
| Pin 31 | RD1 — PORTD bit 1 / parallel slave port data bit 1 |
| Pin 32 | RD2 — PORTD bit 2 / parallel slave port data bit 2 |
| Pin 33 | RD3 — PORTD bit 3 / parallel slave port data bit 3 |
| Pin 34 | RD4 — PORTD bit 4 / parallel slave port data bit 4 |
| Pin 35 | RD5 — PORTD bit 5 / parallel slave port data bit 5 |
| Pin 36 | RD6 — PORTD bit 6 / parallel slave port data bit 6 |
| Pin 37 | RD7 — PORTD bit 7 / parallel slave port data bit 7 |
| Pin 38 | RE0/PSPMODE — PORTE bit 0 / parallel slave port mode select |
| Pin 39 | RE1/PSPEN — PORTE bit 1 / parallel slave port enable |
| Pin 40 | RE2/WR — PORTE bit 2 / write strobe for parallel slave port |
| Pin 41 | RE3/RD — PORTE bit 3 / read strobe for parallel slave port |
| Pin 42 | VSS — Ground reference |
| Pin 43 | VPP — Programming voltage input (device-programmer only) |
| Pin 44 | VDD — Positive supply voltage |
Typical Applications
PIC17C43-25E/L is suitable for 6 applications: Industrial Motor Control, HVAC Temperature Controllers, Security / Alarm Panels, Instrumentation and Data Acquisition, Smart Sensor Network Nodes, User-Interface Front Panels.
Industrial Motor Control
The PIC17C43-25E/L fits industrial motor-control boards because its 25 MHz / 8.25 MIPS core leaves enough headroom for trapezoidal or simple field-oriented control loops at switching frequencies of 10-20 kHz. Its multi-channel Capture/Compare/PWM (CCP) hardware can drive three-phase gate signals directly, while the USART handles RS-485 Modbus feedback to a higher-level PLC. Operating at -40C to +125C, it survives under inverter heatsinks where many flash-based MCUs would be marginal. The 33 I/O lines comfortably accommodate Hall sensors, encoder inputs, fault comparators, brake IGBTs, and panel indicators all on one chip. Use OTP only after firmware is fully validated on a JW windowed PIC17C43 sample.
Recommended
HVAC Temperature Controllers
The PIC17C43-25E/L is well matched to HVAC control boards where extended-temperature reliability and many I/O lines outweigh the need for in-system re-programmability. With 33 I/O pins, the MCU can drive a 32-key keypad, multiplex an LCD character display, read 8-10 thermistor inputs through the analog comparator, and toggle triac-control outputs for compressor / fan / heater stages. The 8 KB OTP holds a complete state-machine plus PID control loop in less than 6 KB. Brown-out reset and watchdog timer protect against power-rail dips common in compressor start-up transients.
Recommended
Security / Alarm Panels
In intrusion-alarm and access-control panels, the PIC17C43-25E/L gives panel designers 33 I/O pins for 8-16 zone inputs, keypad scanning, siren drivers, and a PSTN or GSM dialer interface. The hardware USART supports pass-through to a cellular modem module, while the parallel slave port can be wired to an off-the-shelf LCD / RFID front-end daughter board. The 8 KB OTP accommodates zone definitions, dialer strings, and event logs in a single firmware image, suiting mass-produced panels that never need firmware updates. The extended -40C to +125C range survives unheated garages and outdoor junction boxes.
Recommended
Instrumentation and Data Acquisition
Bench-top instruments and data-acquisition front-ends benefit from the PIC17C43-25E/L's 25 MHz performance and hardware multiplier, which can run 16-bit accumulator loops at the sample rate needed for digital filtering. The 454-byte RAM buffer suits 256-sample FIR / moving-average filters, and the USART streams filtered data to a host PC at 115200 baud. The parallel slave port enables a high-throughput interface to an external 8-bit ADC running in parallel, freeing the core from SPI bit-banging. The 33 I/Os expose sensor enables, gain-control relays, and trigger logic without external shifters.
Recommended
Smart Sensor Network Nodes
The PIC17C43-25E/L can serve as a smart sensor node that aggregates inputs from 4-8 analog sensors and reports via USART to a network backbone. Brown-out reset and watchdog timer protect outdoor sensor deployments from transient brown-outs typical of battery-solar power systems. With 8 KB OTP, designers can embed a sensor-calibration table plus a Modbus RTU stack in firmware. Using the capture/compare hardware for frequency-input flowmeters or tachometers rounds out its applicability to industrial flow and rotation instrumentation where extended temperature and reliability matter.
Recommended
User-Interface Front Panels
The PIC17C43-25E/L is suitable for human-machine-interface (HMI) front panels that drive 7-segment LED displays, scan 4x4 or 5x5 matrix keypads, and talk to a back-end controller via USART or parallel port. The 33 I/O pins directly support multiplexing for 6-digit displays with single-key debounce logic. The 8 KB OTP holds complete button remapping, LED-animation sequences, and serial command parsers. The extended -40C to +125C range is required for industrial cabinets and outdoor kiosks. Designers can prototype firmware on a JW-windowed PIC17C43 before locking it on the production PIC17C43-25E/L.
Recommended
Recommended Products Summary
Engineering reference data for PIC17C43-25E/L — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC17C43-25/L | PIC17C43-33/L | PIC17C43-16I/PQ | PIC17C43-16/L | PIC17C42A-33/PT |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-PLCC (J-Lead) | 44-PLCC (J-Lead) - same | 44-PLCC (J-Lead) - same | 44-MQFP - different | 44-PLCC (J-Lead) - same | 44-TQFP - different |
| Maximum Clock Frequency | 25 MHz | 25 MHz | 33 MHz | 16 MHz | 16 MHz | 33 MHz |
| Performance (MIPS) | 8.25 MIPS | 8.25 MIPS | 10.89 MIPS | 5.28 MIPS | 5.28 MIPS | 10.89 MIPS |
| Program Memory | 8 KB OTP | 8 KB OTP | 8 KB OTP | 8 KB OTP | 8 KB OTP | 6 KB OTP |
| RAM Size | 454 bytes | 454 bytes | 454 bytes | 454 bytes | 454 bytes | 392 bytes |
| I/O Pins | 33 | 33 | 33 | 33 | 33 | 33 |
| Temperature Grade | Extended (-40C to +125C) | Commercial (0C to +70C) | Commercial (0C to +70C) | Industrial (-40C to +85C) | Commercial (0C to +70C) | Commercial (0C to +70C) |
| Lifecycle Status | Last-time-buy | Last-time-buy | Last-time-buy | Last-time-buy | Last-time-buy | Last-time-buy |
Key Differentiators
- Highest program-memory density in the PIC17C4X family (vs PIC17C42A-33/PT)
- Highest throughput in same-package 25 MHz tier (vs PIC17C43-16/L)
- Extended -40C to +125C temperature range (vs PIC17C43-25/L)
Design Notes
The PIC17C43-25E/L is OTP (One-Time-Programmable) and cannot be re-programmed after masking. Per the verified Microchip product page, Microchip recommends migrating to PIC18F4220 for new designs. Always prototype firmware on a JW windowed PIC17C43 (erasable via UV) and lock the production mask only after firmware freeze. Programming voltage (VPP) is applied to pin 43 during device-programmer operations and must be disconnected from any circuit during normal operation - a leakage path will hold the part in reset.
OSC1 (pin 1) and OSC2 (pin 2) traces must be kept short and surrounded by a ground guard ring to avoid injecting switching noise into the external crystal circuit. The MCLR (pin 3) reset line should be pulled to VDD via a 10-50 kohm resistor with a 100 nF decoupling cap to ground for noise immunity, per Microchip PIC17C4X hardware-design guidelines. VDD/VSS pin pairs (10/11, 28/29, 42/44) must each be bypassed with a 100 nF ceramic capacitor placed within 5 mm of the corresponding pin. PLCC sockets are recommended during development to enable socket swaps between JW and production devices.
Brown-out reset and watchdog timer (WDT) must be enabled via configuration bits to protect against industrial-grade brown-out and code-lockup conditions. The WDT has its own RC oscillator that runs independently of OSC1/2. The 33 I/O lines share operating voltage with VDD, so any 5V-tolerant interface exceeding VDD+0.3V can latch-up. For battery-backed designs, note that the PIC17C43 does not have internal RTC and that SRAM is lost on power-down.
Compliance Information
Compliance status for PIC17C43-25E/L not provided in the verified data; legacy OTP parts from late 1990s/early 2000s were typically produced with leaded terminations prior to RoHS enforcement. Verify with Microchip's environmental compliance documentation before using in RoHS-restricted designs.
