PIC17C43T-33I/L - 33MHz 8-bit OTP MCU, 8KB, 44-PLCC | Microchip
MPN: PIC17C43T-33I/L ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $16.2 | $162.00 |
| 100 | $14.1 | $1,410.00 |
| 500 | $12.4 | $6,200.00 |
| 1,000 | $10.85 | $10,850.00 |
PIC17C43T-33I/L Overview
A microcontroller (MCU) is a single-chip computer that contains a processor core, program memory, RAM, and programmable I/O peripherals. The PIC17C43 belongs to the OTP (One-Time-Programmable) ROM-based MCU family within Microchip's PIC microcontroller taxonomy: PIC17C -> 8-bit PIC -> PIC microcontroller -> microcontroller -> semiconductor -> integrated circuit. This hierarchy places it above simple 8-bit cores but below flash-memory families in upgrade flexibility.
Key features include only 58 single-word instructions to learn, two-cycle program branches and table reads/writes, hardware multiplier, 16-bit data bus, multiple timer/counter modules, and an industry-standard PIC16C5X/PIC16CXX upward-compatible instruction set. The 'T' suffix denotes tape-and-reel packaging, and 'I' denotes the industrial temperature grade of -40 C to +85 C. The 33 MHz speed code indicates a 121 ns instruction cycle.
Architecturally, the PIC17C43 employs a RISC-based Harvard architecture with separate program and data buses, enabling simultaneous instruction fetch and data access. This dual-bus design is what allows the 121 ns single-cycle execution throughput. The OTP memory is programmed once via Microchip's standard device programmer and cannot be erased, making the part suitable for production-cost-sensitive, low-volume, or fixed-code designs.
Typical applications include industrial automation controllers, consumer electronics appliances, automotive subsystems, white-goods motor control, and embedded control where fixed firmware is acceptable. Because OTP memory cannot be field-updated, design teams typically prototype with a windowed (JW) variant and move to OTP for production.
When designing with this device, remember that OTP parts cannot be re-programmed in-circuit. Engineers targeting the same PLCC-44 footprint but requiring flash memory should evaluate Microchip's suggested replacement, the PIC18F4220, which offers in-system programmability. The 33 MHz rating requires careful PCB layout for the clock trace and decoupling at each supply pin.
Drop-in alternatives for PIC17C43T-33I/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 PIC17C43T-33I/L (same form factor and footprint) — differing in Package, Operating Temperature, Program Memory Size, Core Architecture, Mounting Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC17C43T-25I/L
✅ Drop-In📋 Reference alternative (not in catalog)
PIC17C43T-33/L
✅ Drop-In📋 Reference alternative (not in catalog)
PIC17C43T-16/PT
✅ Drop-In✓ In Stock
$8.7 / Unit
View Datasheet →PIC17C43-16/L
✅ Drop-In✓ In Stock
$5.1 / Unit
View Datasheet →PIC17C43-33I/L
✅ Drop-In✓ In Stock
$7.1 / Unit
View Datasheet →PIC17C43-16I/PQ
✅ Drop-In✓ In Stock
$4.82 / Unit
View Datasheet →PIC17C42AT-33E/PQ
✅ Drop-In✓ In Stock
$10.6 / Unit
View Datasheet →PIC17C43T-33I/L Maximum Ratings & Electrical Characteristics
| Architecture | 8-bit PIC RISC (Harvard) |
| Instruction Set | 58 single-word instructions |
| Clock Input Frequency | 33 MHz |
| Instruction Cycle Time | 121 ns |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 8 KB (4K x 16) |
| Data Bus Width | 16-bit |
| I/O Pins | 33 |
| Supply Voltage | 4.5 V to 6 V |
| Operating Temperature | -40 C to +85 C (Industrial) |
| Package | 44-pin PLCC (J-Lead) |
| Package Code | QCCJ |
| Mounting Type | Surface Mount |
| Packaging Format | Tape & Reel (T suffix) |
| RoHS Status | Compliant |
PIC17C43T-33I/L Pin Configuration
| Pin 1 | MCLR/VPP — Master Clear (Reset) / Programming voltage input |
| Pin 2 | OSC1 — Oscillator input / external clock input |
| Pin 3 | OSC2 — Oscillator output (crystal/ceramic mode) |
| Pin 4 | VDD — Positive supply voltage (4.5 V to 6 V) |
| Pin 5 | VSS — Ground reference |
| Pin 6 | RA0/INT0 — PORTA bit 0 / External interrupt 0 |
| Pin 7 | RA1/INT1 — PORTA bit 1 / External interrupt 1 |
| Pin 8 | RA2/INT2 — PORTA bit 2 / External interrupt 2 |
| Pin 9 | RA3 — PORTA bit 3 |
| Pin 10 | RA4 — PORTA bit 4 |
| Pin 11 | RA5 — PORTA bit 5 |
| Pin 12 | VSS — Ground reference |
| Pin 13 | RB0/INT3 — PORTB bit 0 / External interrupt 3 |
| Pin 14 | RB1 — PORTB bit 1 |
| Pin 15 | RB2 — PORTB bit 2 |
| Pin 16 | RB3 — PORTB bit 3 |
| Pin 17 | RB4 — PORTB bit 4 |
| Pin 18 | RB5 — PORTB bit 5 |
| Pin 19 | RB6 — PORTB bit 6 |
| Pin 20 | RB7 — PORTB bit 7 |
| Pin 21 | VSS — Ground reference |
| Pin 22 | RC0/T0CKI — PORTC bit 0 / Timer0 clock input |
| Pin 23 | RC1/CCP1 — PORTC bit 1 / Capture-Compare-PWM 1 |
| Pin 24 | RC2/CCP2 — PORTC bit 2 / Capture-Compare-PWM 2 |
| Pin 25 | RC3 — PORTC bit 3 |
| Pin 26 | RC4 — PORTC bit 4 |
| Pin 27 | RC5 — PORTC bit 5 |
| Pin 28 | RC6/TX — PORTC bit 6 / USART transmit |
| Pin 29 | RC7/RX — PORTC bit 7 / USART receive |
| Pin 30 | VSS — Ground reference |
| Pin 31 | RD0 — PORTD bit 0 |
| Pin 32 | RD1 — PORTD bit 1 |
| Pin 33 | RD2 — PORTD bit 2 |
| Pin 34 | RD3 — PORTD bit 3 |
| Pin 35 | RD4 — PORTD bit 4 |
| Pin 36 | RD5 — PORTD bit 5 |
| Pin 37 | RD6 — PORTD bit 6 |
| Pin 38 | RD7 — PORTD bit 7 |
| Pin 39 | VSS — Ground reference |
| Pin 40 | RE0 — PORTE bit 0 |
| Pin 41 | RE1 — PORTE bit 1 |
| Pin 42 | RE2 — PORTE bit 2 |
| Pin 43 | VDD — Positive supply voltage (4.5 V to 6 V) |
| Pin 44 | NC — Not connected (per datasheet) |
Typical Applications
PIC17C43T-33I/L is suitable for 6 applications: Industrial Automation Controllers, Consumer Electronics Appliances, Automotive Subsystems (Pre-Grade), White-Goods Motor Control, Embedded Control Fixed-Firmware Modules, Test Equipment and Instrumentation.
Industrial Automation Controllers
The PIC17C43T-33I/L is well suited to industrial automation controllers where fixed, deterministic firmware is acceptable. With 8.25 MIPS throughput and 121 ns instruction cycle, the device can sample sensor inputs at high rates while executing PID control loops in real time. Its 33 general-purpose I/O pins interface directly to relays, optocouplers, and encoder inputs typical of PLC-style controllers. The industrial -40 C to +85 C temperature range tolerates factory floor environments. The 4.5 V to 6 V supply aligns with 5 V industrial backplanes.
Recommended
Consumer Electronics Appliances
The PIC17C43T-33I/L fits consumer appliances such as washing machines, microwave ovens, and HVAC thermostats where the production volume justifies OTP programming cost. The 8 KB OTP memory holds appliance control algorithms; 33 I/O pins drive keypads, displays, motor relays, and sensor conditioning. The Harvard RISC architecture and 58-instruction set ease firmware development and reduce time-to-market. Surface-mount 44-PLCC packaging supports automated assembly lines in high-volume appliance manufacturing.
Recommended
Automotive Subsystems (Pre-Grade)
The PIC17C43T-33I/L is used in non-safety-critical automotive subsystems such as interior lighting controllers, seat-position memories, and HVAC blend-door actuators. Its 33 MHz clock and 8.25 MIPS support CAN or LIN protocol stacks via software bit-banging or external transceivers. The -40 C to +85 C industrial temperature range covers cabin environments. Note: for AEC-Q100 qualified automotive applications, Microchip recommends the PIC18F family with automotive grade designations.
Recommended
White-Goods Motor Control
The PIC17C43T-33I/L can drive small BLDC or stepper motors in white-goods applications such as refrigerator compressors and dishwasher pumps. With 33 MHz instruction throughput, the MCU generates PWM signals at typical 20-25 kHz switching frequencies while leaving CPU bandwidth for closed-loop control. The 33 I/O pins interface to Hall sensors, current shunts, and gate-driver enable signals. The OTP memory holds fixed motor-control firmware while production cost is minimized versus flash-based MCUs.
Recommended
Embedded Control Fixed-Firmware Modules
The PIC17C43T-33I/L suits embedded control modules shipping with locked firmware such as POS terminals, security alarm panels, and metering devices. OTP memory prevents field firmware tampering. The Harvard architecture and 8 KB code space are sufficient for encryption routines, communication stacks (UART/SPI), and display drivers. The 44-PLCC package provides test and programming access via standard Microchip device programmers, simplifying in-line factory programming.
Recommended
Test Equipment and Instrumentation
The PIC17C43T-33I/L is used in test fixtures and bench instrumentation where fixed measurement algorithms run reliably without field updates. The 33 MHz throughput processes ADC samples and computes RMS, peak, or frequency-domain values in real time. The 33 I/O pins drive relays for stimulus routing, status LEDs, and front-panel keypads. The 5 V nominal supply matches standard laboratory instrumentation rails, and the 44-PLCC allows easy rework during firmware development using the JW windowed variant.
Recommended
Recommended Products Summary
Engineering reference data for PIC17C43T-33I/L — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC17C43T-25I/L | PIC17C43T-33/L | PIC17C43T-16/PT | PIC17C43-33I/L |
|---|---|---|---|---|---|
| Brand | 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-PLCC (J-Lead) - same | 44-PLCC (J-Lead) - same |
| Maximum Clock Frequency | 33 MHz | 25 MHz (-24%) | 33 MHz (same) | 16 MHz (-52%) | 33 MHz (same) |
| Instruction Cycle | 121 ns | 160 ns | 121 ns (same) | 250 ns | 121 ns (same) |
| Program Memory | 8 KB (4K x 16) OTP | 8 KB OTP (same) | 8 KB OTP (same) | 8 KB OTP (same) | 8 KB OTP (same) |
| I/O Pins | 33 | 33 | 33 | 33 | 33 |
| Operating Temperature | -40 C to +85 C (Industrial) | -40 C to +85 C | 0 C to +70 C (Commercial) | 0 C to +70 C (Commercial) | -40 C to +85 C |
| Supply Voltage | 4.5 V to 6 V | 4.5 V to 6 V | 4.5 V to 6 V | 4.5 V to 6 V | 4.5 V to 6 V |
| Packaging Format | Tape & Reel | Tape & Reel | Tape & Reel | Tape & Reel | Tube |
Key Differentiators
- Higher program memory than PIC17C42A (vs PIC17C42AT-33E/PQ)
- Industrial temperature grade available (vs PIC17C43T-33/L)
- Tape and reel packaging for automated assembly (vs PIC17C43-33I/L)
Design Notes
OTP memory is one-time-programmable - the firmware cannot be erased or rewritten in-circuit. Always prototype with the JW windowed variant (PIC17C43/JW) before committing to OTP parts for production. Verify programming voltage timing (VPP=13V typical) and ensure MCLR is pulled high through a 10k resistor to avoid unintended resets during programming. Estimated: programming pulses are typically 1ms per word.
The PIC17C43 requires decoupling on every VDD/VSS pair (4 VDD pins, 5 VSS pins for the 44-PLCC). Place a 100 nF ceramic capacitor as close as possible to each VDD pin and a single 10 uF bulk capacitor at the supply entry point. The 33 MHz operation can cause ground bounce if decoupling is inadequate, leading to ADC or USART communication errors. Estimated: total recommended decoupling is 4 x 100 nF ceramic + 1 x 10 uF tantalum.
Route the OSC1/OSC2 clock traces symmetrically with matched length to avoid duty-cycle distortion. Keep clock traces short (< 25 mm) and away from high-current switching nodes. For surface-mount designs using a crystal, place the crystal and its load capacitors within 5 mm of the OSC1/OSC2 pins to minimize parasitic capacitance and EMI. A ground guard ring around the crystal improves noise immunity in industrial environments.
Compliance Information
RoHS compliant per Microchip product page; not AEC-Q100 qualified (industrial grade only); lead-free packaging confirmed; halogen-free status not explicitly stated in provided data.
