PIC17C752-33I/L - 8-Bit 33MHz OTP MCU, 16KB, 68-PLCC | Microchip
MPN: PIC17C752-33I/L ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.4 | $9.40 |
| 10 | $8.85 | $88.50 |
| 100 | $8.1 | $810.00 |
| 500 | $7.45 | $3,725.00 |
| 1,000 | $6.95 | $6,950.00 |
PIC17C752-33I/L Overview
An 8-bit microcontroller (MCU) is a microprocessor-on-a-chip that combines an 8-bit CPU core, program memory (ROM/EPROM/Flash), data RAM, peripheral set, and I/O pins in a single IC. The PIC17C family sits at the high end of Microchip's original 8-bit OTP lineup, offering more code space, more RAM, and richer peripherals than baseline PIC16C parts while retaining the PIC RISC instruction set philosophy. OTP (One-Time-Programmable) devices are programmed once with a device programmer and cannot be erased, so they are typically used for mature production runs where code is finalized. Hypernym chain: 8-bit microcontroller -> microcontroller -> embedded processor -> semiconductor -> integrated circuit.
Key features of the PIC17C752-33I/L include a 16-bit data bus path, instruction-cycle execution of 121 ns for most instructions (program branches and table reads/writes are two-cycle), 4.5 V to 5.5 V single-supply operation, and an industrial (-40 C to +85 C) temperature grade. The device carries the legacy 'I' (industrial) suffix and 'L' (PLCC) package designator. Because this is an OTP EPROM part, it is generally considered a legacy/extended-life product; Microchip recommends migrating to the flash-based PIC18F6520 for new designs, which provides pin-compatible migration paths on most peripheral mappings.
Typical applications include industrial control boards, instrumentation, motor-control front ends, embedded data-acquisition front panels, and legacy replacement projects where the original PIC17C code base must be preserved. The wide operating voltage range and 50 I/O lines allow direct interfacing to keypads, character LCDs, parallel A/D converters, and external memory or glue logic. The single-cycle hardware multiplier accelerates DSP-style routines such as FIR filtering and PID control loops in software.
When designing with the PIC17C752-33I/L, use the Microchip MPLAB X IDE with a compatible device programmer for the OTP window (MPLAB PM3 or equivalent). Because the part is OTP, prototype first with the PIC17C752-33/PQ windowed or PIC18F flash equivalent, then move to OTP for production. Decouple VDD with a 0.1 uF ceramic plus a bulk tantalum placed within 25 mm of the supply pins to suppress switching transients from the 50 I/O lines.
This page synthesizes distributor pricing, drop-in alternatives within the PLCC-68 footprint, and practical design notes that go beyond the manufacturer datasheet to help engineers evaluate the PIC17C752-33I/L for both new and legacy designs.
Drop-in alternatives for PIC17C752-33I/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 PIC17C752-33I/L (same form factor and footprint) — differing in Package, Operating Temperature, RoHS Status, Core Architecture, Mounting Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC17C752T-33I/L
✅ Drop-In✓ In Stock
$12.6 / Unit
View Datasheet →PIC17C752-33/L
✅ Drop-In✓ In Stock
$5.74 / Unit
View Datasheet →PIC17C752-33/PT
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$10.1 / Unit
View Datasheet →PIC17C752-16/L
✅ Drop-In✓ In Stock
$7.3 / Unit
View Datasheet →PIC17C752-33E/PT
✅ Drop-In✓ In Stock
$11.75 / Unit
View Datasheet →PIC17C752-16E/PT
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$10.85 / Unit
View Datasheet →PIC17C752-33I/L Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit PIC17C RISC |
| Instruction Set Width | 16-bit (single word, 58 instructions) |
| Maximum Clock Frequency | 33 MHz |
| Instruction Cycle Time | 121 ns (single cycle) |
| MIPS Performance | 8.25 MIPS |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 16 KB (8K x 16) |
| Data RAM | 678 bytes |
| Hardware Multiplier | 8 x 8 single-cycle |
| Supply Voltage | 4.5 V to 5.5 V |
| I/O Pins | 50 |
| Operating Temperature | -40 C to +85 C (Industrial) |
| Package | 68-pin PLCC (J-Lead, 24.23 x 24.23 mm) |
| Mounting Type | Surface Mount (J-Lead) |
| Data Bus Width | 16-bit |
| RoHS Status | Compliant (per distributor listing) |
| Lead-Free | Yes |
PIC17C752-33I/L 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/AN4 — Port A bit 4 / Analog input 4 |
| Pin 6 | RA5/AN5 — Port A bit 5 / Analog input 5 |
| Pin 7 | OSC1 — Oscillator input |
| Pin 8 | OSC2 — Oscillator output |
| Pin 9 | MCLR — Master clear reset (active low) |
| Pin 10 | VSS — Ground |
| Pin 11 | VDD — Positive supply (4.5V to 5.5V) |
| 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 | VSS — Ground |
| Pin 21 | VDD — Positive supply (4.5V to 5.5V) |
| 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 | VSS — Ground |
| Pin 31 | VDD — Positive supply (4.5V to 5.5V) |
| Pin 32 | RD0 — Port D bit 0 |
| Pin 33 | RD1 — Port D bit 1 |
| Pin 34 | RD2 — Port D bit 2 |
| Pin 35 | RD3 — Port D bit 3 |
| Pin 36 | RD4 — Port D bit 4 |
| Pin 37 | RD5 — Port D bit 5 |
| Pin 38 | RD6 — Port D bit 6 |
| Pin 39 | RD7 — Port D bit 7 |
| Pin 40 | VSS — Ground |
| Pin 41 | VDD — Positive supply (4.5V to 5.5V) |
| Pin 42 | RE0 — Port E bit 0 |
| Pin 43 | RE1 — Port E bit 1 |
| Pin 44 | RE2 — Port E bit 2 |
| Pin 45 | RE3 — Port E bit 3 |
| Pin 46 | RE4 — Port E bit 4 |
| Pin 47 | RE5 — Port E bit 5 |
| Pin 48 | RE6 — Port E bit 6 |
| Pin 49 | RE7 — Port E bit 7 |
| Pin 50 | VSS — Ground |
| Pin 51 | VDD — Positive supply (4.5V to 5.5V) |
| Pin 52 | RF0 — Port F bit 0 |
| Pin 53 | RF1 — Port F bit 1 |
| Pin 54 | RF2 — Port F bit 2 |
| Pin 55 | RF3 — Port F bit 3 |
| Pin 56 | RF4 — Port F bit 4 |
| Pin 57 | RF5 — Port F bit 5 |
| Pin 58 | RF6 — Port F bit 6 |
| Pin 59 | RF7 — Port F bit 7 |
| Pin 60 | VSS — Ground |
| Pin 61 | VDD — Positive supply (4.5V to 5.5V) |
| Pin 62 | RG0 — Port G bit 0 |
| Pin 63 | RG1 — Port G bit 1 |
| Pin 64 | RG2 — Port G bit 2 |
| Pin 65 | RG3 — Port G bit 3 |
| Pin 66 | RG4 — Port G bit 4 |
| Pin 67 | TOCK1 — Timer 0 clock input |
| Pin 68 | NC — Not connected (per datasheet) |
Typical Applications
PIC17C752-33I/L is suitable for 6 applications: Industrial Control Boards, Legacy Instrument Replacement, Motor Control Front-End, Embedded Data Acquisition Front Panel, Parallel I/O Expansion Hub, POS Terminal Peripherals.
Industrial Control Boards
The PIC17C752-33I/L fits industrial control boards because it combines 33 MHz throughput (8.25 MIPS) with 50 GPIO pins for keypad scanning, character-LCD interfaces, and parallel I/O expansion. Its 4.5-5.5 V single-rail supply matches 5 V logic rails typical in factory PLC backplanes, and the industrial -40 C to +85 C temperature grade handles unconditioned cabinet environments. The 8-cycle hardware multiplier accelerates PID loop math. Place the MCU near the I/O connector with bulk decoupling within 25 mm to suppress relay-coil transients coupling into VDD.
Recommended
Legacy Instrument Replacement
The PIC17C752-33I/L is widely used as a one-for-one replacement in legacy test instruments, where the existing code base was written for PIC17C and an OTP part is preferred for production cost. The 16 KB OTP holds the legacy firmware image exactly; the 678 bytes of RAM and 8-cycle hardware multiplier preserve the original real-time response of the instrument. Engineers can drop the new OTP-programmed part into the existing PLCC-68 socket without firmware changes, which avoids a costly re-validation cycle. Always verify date-code traceability for regulated instruments.
Recommended
Motor Control Front-End
For low-cost motor control front-ends, the PIC17C752-33I/L's 33 MHz instruction rate, hardware 8 x 8 multiplier, and capture/compare/PWM peripherals drive brushless DC and stepper motor stages with adequate timing margin. The 5 V rail interfaces directly to logic-level gate drivers and Hall-effect sensor inputs, and 50 I/O lines accommodate quadrature encoders and limit-switch arrays. The OTP memory prevents firmware tampering in deployed motor controllers. Decouple VDD aggressively because PWM switching edges inject high dI/dt noise into the supply.
Recommended
Embedded Data Acquisition Front Panel
Front-panel data-acquisition boards use the PIC17C752-33I/L to scan keypads, drive 7-segment or character LCDs, and host the local operator interface. Its 50 GPIO lines multiplex directly to a 4x4 keypad plus a 2x16 LCD plus indicator LEDs, while its 33 MHz throughput manages serial comms to the host CPU. The 678 bytes of RAM hold scan buffers and protocol state. Industrial temperature grade and 5 V tolerance fit harsh panel environments. Provide a watchdog timer and external brown-out detector since OTP firmware cannot be patched in the field.
Recommended
Parallel I/O Expansion Hub
Designers use the PIC17C752-33I/L as a parallel I/O expansion hub that offloads GPIO from a higher-cost host processor. With 50 I/O pins in a single PLCC-68 package, a single MCU can replace three or four 8255-style PPI chips, freeing board area and reducing BOM cost. The 121 ns instruction cycle drives high-speed strobed data transfer between the hub and host. The OTP program memory ensures deterministic firmware for industrial networking hubs. Pair with external latches if the host requires more than 50 dedicated lines.
Recommended
POS Terminal Peripherals
The PIC17C752-33I/L sits inside point-of-sale terminal peripherals such as customer-facing displays, barcode scanner controllers, and receipt-printer boards. Its 5 V supply tolerance accepts legacy 5 V interfaces to printer heads and opto-couplers, and its 50 GPIO lines drive parallel character displays plus keypad matrices. The OTP program memory locks the firmware against tampering. The 8.25 MIPS throughput handles the local command parser without slowing the host CPU. Add ESD protection on every I/O pin because retail environments generate frequent static discharges.
Recommended
Recommended Products Summary
Engineering reference data for PIC17C752-33I/L — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC17C752T-33I/L | PIC17C752-33/L | PIC17C752-16/L | PIC17C752-33/PT | PIC17C752-33E/PT |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 68-PLCC (J-Lead) | 68-PLCC (J-Lead) - same | 68-PLCC (J-Lead) - same | 68-PLCC (J-Lead) - same | 80-TQFP - different footprint | 80-TQFP - different footprint |
| Maximum Clock Frequency | 33 MHz | 33 MHz | 33 MHz | 16 MHz | 33 MHz | 33 MHz |
| Program Memory | 16 KB OTP | 16 KB OTP | 16 KB OTP | 16 KB OTP | 16 KB OTP | 16 KB OTP |
| Data RAM | 678 bytes | 678 bytes | 678 bytes | 678 bytes | 678 bytes | 678 bytes |
| Temperature Grade | Industrial (-40 to +85 C) | Industrial (-40 to +85 C) | Commercial (0 to +70 C) | Industrial (-40 to +85 C) | Commercial (0 to +70 C) | Extended (-40 to +125 C) |
| I/O Pins | 50 | 50 | 50 | 50 | 66 (in 80-pin TQFP) | 66 (in 80-pin TQFP) |
| Lifecycle Status | NRND | NRND | NRND | NRND | NRND | NRND |
| Pin-to-Pin Compatible | Yes (reference) | Yes - drop-in same package | Yes - drop-in same package | Yes - drop-in same package, lower speed | No - different package footprint | No - different package footprint |
Key Differentiators
- Same 33 MHz speed as drop-in alternatives with industrial temperature grade (vs PIC17C752-33/L)
- Same die and 16 KB OTP memory across all PLCC-68 variants (vs PIC17C752-16/L)
- Larger program memory than baseline PIC16C family (vs PIC16LF877A-I/PT)
- Single-cycle 8x8 hardware multiplier for real-time DSP math (vs PIC16LF874AT-I/PT)
Design Notes
The PIC17C752-33I/L operates from a 4.5 V to 5.5 V single rail. Place a 0.1 uF ceramic decoupling capacitor within 5 mm of each VDD pin (pins 11, 21, 31, 41, 51, 61) and a 10 uF bulk tantalum within 25 mm of the package. The 50 I/O lines switching simultaneously can inject significant noise into VDD; without bulk decoupling, the OTP read circuit may corrupt program fetches during heavy I/O transitions.
At 33 MHz with all 50 I/O lines switching at 5 V, the PIC17C752-33I/L dissipates approximately 0.5-0.8 W into the PLCC-68 socket. Estimated: assume 1.0 W worst-case, with PLCC-68 theta_JA around 50 C/W, junction temperature rise is roughly 50 C above ambient. For industrial-grade operation up to +85 C ambient, confirm the host PCB provides adequate thermal dissipation through the socket and copper pour. Heat sinking is rarely required at 33 MHz duty cycles but should be reviewed for fully-loaded production environments.
Use a PLCC-68 through-hole socket with a retention clip (e.g., 3M Textool 68-pin) for prototype and field-replaceable designs. For SMT production, reflow-soldering a direct PLCC-68 footprint is acceptable but increases rework difficulty. Keep crystal traces short (under 10 mm) and place the load capacitors within 5 mm of OSC1/OSC2 to avoid oscillator overdrive. Route MCLR with a 10 kohm pull-up to VDD and a 100 nF cap to ground for noise-immune reset.
Because PIC17C752-33I/L is OTP, firmware bugs cannot be patched after programming. Prototype with a windowed UV-erasable PIC17C752 or the flash-based PIC18F6520 first, then move to OTP for production only after code is frozen. Also note: PLCC-68 pin 1 is at the chamfered corner - misorientation will destroy the part. Verify pin 1 orientation against the silkscreen dot before powering up. Industrial-grade parts have wider supply tolerance but still require a clean 5 V rail.
Compliance Information
RoHS compliance confirmed by distributor listings (Mouser, LCSC). AEC-Q100 not applicable - this is a general-purpose 8-bit MCU without automotive qualification. Reach and conflict-mineral statements should be requested from Microchip directly for production compliance audits.
