PIC17C42AT-33/PQ Equivalent & Substitute Parts

Part Overview

The PIC17C42AT-33/PQ is an 8-bit microcontroller from Microchip Technology's PIC® 17C series, featuring 4KB OTP program memory, 33MHz operation, and 33 I/O pins in a 44-MQFP package. This device is classified as obsolete, making identification of compatible alternatives essential for ongoing system support, maintenance, and legacy design updates. Substitute parts must maintain electrical and mechanical compatibility across core processor architecture, memory configuration, and package specifications.

Substiute Parts

PIC17C42AT-33/PQ

Microchip TechnologyIn Stock: 985PIC17C42AT-33/PQ Datasheet

Current PartRFQ

PIC17C42A-33/PQ

Microchip TechnologyIn Stock: 873PIC17C42A-33/PQ Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PIC17C42AT-33/PQ is determined by strict alignment across the following critical parameters:

• Core Processor Architecture: PIC processor family
• Core Size: 8-Bit configuration
• Operating Speed: 33MHz clock frequency
• Program Memory: 4KB OTP capacity
• Memory Organization: 2K x 16 word structure
• RAM Configuration: 232 x 8 byte allocation
• I/O Pin Count: 33 pins minimum
• Supply Voltage Range: 4.5V ~ 6V compatibility
• Operating Temperature Range: 0°C ~ 70°C
• Package Type: 44-QFP surface mount
• Connectivity Features: UART/USART support
• Peripheral Set: POR, PWM, WDT functionality

Substitute parts must match all electrical specifications and physical packaging requirements. Variations in product status (obsolete vs. active) do not affect electrical substitutability but may impact availability and long-term support considerations.

Parameter Comparison

Engineering Selection Recommendations

The PIC17C42A-33/PQ serves as a direct electrical and mechanical substitute for the PIC17C42AT-33/PQ. Both devices share identical core specifications, memory configurations, I/O architecture, and package dimensions. The primary distinction is product lifecycle status: the original part is obsolete while the substitute remains in active production.

Selection of the PIC17C42A-33/PQ is supported by:

• Full electrical parameter alignment across processor, memory, and I/O specifications
• Identical 44-QFP package footprint and pin configuration
• Matching ROHS3 compliance and REACH unaffected status
• Equivalent MSL rating and moisture sensitivity classification
• Continued availability through active product status

Frequently Asked Questions (FAQ)

Q: Are PIC17C42AT-33/PQ and PIC17C42A-33/PQ pin-compatible?

A: Yes. Both devices use the 44-QFP package with identical pin assignments, I/O configuration, and electrical characteristics. Direct PCB substitution is supported without layout modifications.

Q: What is the difference between these part numbers?

A: The primary difference is product status. PIC17C42AT-33/PQ is obsolete; PIC17C42A-33/PQ is active production. Electrical specifications, memory organization, and performance characteristics are identical.

Q: Can I use PIC17C42A-33/PQ in legacy designs originally specified for PIC17C42AT-33/PQ?

A: Yes. Identical electrical and mechanical specifications ensure functional compatibility in existing circuit designs without firmware or hardware modifications.

Q: Are there supply voltage or temperature range differences?

A: No. Both parts operate across 4.5V ~ 6V supply range and 0°C ~ 70°C temperature range with identical specifications.

Q: Do both parts support the same peripherals and connectivity?

A: Yes. Both devices include UART/USART connectivity and POR, PWM, WDT peripheral functions.

Q: What is the MSL rating for these microcontrollers?

A: Both parts carry MSL 3 rating with 168-hour moisture sensitivity level classification, requiring standard moisture control during storage and handling.