PIC17C762-33I/L Equivalent & Substitute Parts

Part Overview

The PIC17C762-33I/L is an 8-bit microcontroller from Microchip Technology's PIC® 17C series, featuring 16KB OTP program memory, 678 x 8 bytes of RAM, and operation at 33MHz. The device is packaged in an 84-PLCC surface mount configuration with integrated peripherals including I2C, SPI, UART/USART connectivity, PWM, watchdog timer, and brown-out detection. This part maintains Active product status and is RoHS3 compliant.

Substitute parts become necessary when the 84-PLCC package is unavailable, when higher program memory capacity is required, or when FLASH memory technology is preferred over OTP for development and production flexibility.

Key Parameters

Parameter	PIC17C762-33I/L
Core Processor	PIC
Core Size	8-Bit
Speed	33MHz
Program Memory Size	16KB (8K x 16)
Program Memory Type	OTP
RAM Size	678 x 8
Voltage Supply (Vcc/Vdd)	4.5V ~ 5.5V
Number of I/O	66
Data Converters	A/D 16x10b
Connectivity	I2C, SPI, UART/USART
Peripherals	Brown-out Detect/Reset, POR, PWM, WDT
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	84-LCC (J-Lead)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the PIC17C762-33I/L is based on the following criteria:

Core Compatibility Requirements:

PIC microcontroller architecture (PIC core processor)
8-bit core size
Minimum 16KB program memory capacity
Compatible voltage supply range (minimum 4.5V operation)
Equivalent or greater I/O count (66 minimum)
A/D converter capability (16x10b)
Presence of I2C, SPI, and UART/USART connectivity
Integrated PWM, watchdog timer, and brown-out detection

Acceptable Variations:

Program memory type: FLASH substitutes OTP (provides superior development flexibility)
Operating speed: 40MHz exceeds 33MHz requirement
Package format: Different surface mount packages acceptable if pin count and functionality preserved
RAM capacity: Increased RAM is acceptable
EEPROM availability: Addition of EEPROM is acceptable

The PIC18F8520-I/PT and PIC18LF8520-I/PT meet these criteria as PIC® 18F series devices with enhanced specifications while maintaining core architectural compatibility.

Parameter Comparison

Parameter	PIC17C762-33I/L	PIC18F8520-I/PT	PIC18LF8520-I/PT
Manufacturer	Microchip Technology	Microchip Technology	Microchip Technology
Core Processor	PIC	PIC	PIC
Core Size	8-Bit	8-Bit	8-Bit
Speed	33MHz	40MHz	40MHz
Program Memory Size	16KB (8K x 16)	32KB (16K x 16)	32KB (16K x 16)
Program Memory Type	OTP	FLASH	FLASH
RAM Size	678 x 8	2K x 8	2K x 8
Voltage Supply (Vcc/Vdd)	4.5V ~ 5.5V	4.2V ~ 5.5V	2V ~ 5.5V
Number of I/O	66	68	68
Data Converters	A/D 16x10b	A/D 16x10b	A/D 16x10b
Connectivity	I2C, SPI, UART/USART	EBI/EMI, I2C, SPI, UART/USART	EBI/EMI, I2C, SPI, UART/USART
Peripherals	Brown-out Detect/Reset, POR, PWM, WDT	Brown-out Detect/Reset, LVD, POR, PWM, WDT	Brown-out Detect/Reset, LVD, POR, PWM, WDT
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Package / Case	84-LCC (J-Lead)	80-TQFP	80-TQFP
Mounting Type	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active

Engineering Selection Recommendations

PIC18F8520-I/PT is suitable for applications requiring standard 5V operation (4.2V ~ 5.5V). This device provides doubled program memory capacity (32KB FLASH), enhanced processing speed (40MHz), and additional I/O pins (68 vs. 66). The FLASH memory type enables in-circuit reprogramming, eliminating OTP limitations. Low voltage detection (LVD) and external bus interface (EBI/EMI) capabilities extend functional scope. All compliance certifications (RoHS3, REACH Unaffected) match the original part.

PIC18LF8520-I/PT extends voltage operation to 2V minimum, supporting low-power and battery-operated applications beyond the original 4.5V floor. Identical memory, speed, and peripheral specifications to the PIC18F8520-I/PT apply. This variant is appropriate when extended voltage range is a design requirement.

Both substitutes maintain Active product status and full regulatory compliance. Package transition from 84-PLCC to 80-TQFP requires PCB layout modification but preserves all functional capabilities.

Frequently Asked Questions (FAQ)

Q: Can PIC18F8520-I/PT or PIC18LF8520-I/PT directly replace PIC17C762-33I/L without code modification?

A: Core instruction set compatibility exists between PIC17C and PIC18F architectures, but code review and testing are necessary. Memory organization, register definitions, and peripheral register layouts differ. Firmware adaptation is typically required.

Q: What is the primary advantage of FLASH memory over OTP?

A: FLASH memory permits in-circuit reprogramming and field updates. OTP allows single programming only. For development, prototyping, and production scenarios requiring firmware updates, FLASH provides operational flexibility.

Q: How does the package change from 84-PLCC to 80-TQFP affect board design?

A: Pin count decreases from 84 to 80, and physical footprint changes significantly (84-PLCC is 29.31x29.31mm; 80-TQFP is 12x12mm). PCB layout, routing, and component placement require redesign. Pin mapping must be verified against datasheet pinouts.

Q: Why does PIC18LF8520-I/PT support 2V minimum while PIC18F8520-I/PT requires 4.2V?

A: The "LF" designation indicates low-voltage operation capability. PIC18LF8520-I/PT incorporates design modifications enabling reliable operation at reduced supply voltages, suitable for battery-powered and energy-harvesting applications.

Q: Are the substitute parts in current production?

A: Both PIC18F8520-I/PT and PIC18LF8520-I/PT maintain Active product status with Microchip Technology. Inventory availability is confirmed (10,648 and 2,851 units respectively).

Q: What compliance certifications apply to the substitute parts?

A: Both substitutes are RoHS3 compliant, REACH unaffected, and carry identical ECCN (3A991A2) and HTSUS (8542.31.0001) classifications as the original PIC17C762-33I/L.

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