PIC16LC64AT-04I/PQ Equivalent & Substitute Parts

Part Overview

The PIC16LC64AT-04I/PQ is an 8-bit microcontroller from Microchip Technology's PIC® 16C series, featuring 4.6KB OTP program memory, 128 bytes of RAM, and 33 I/O pins in a 44-MQFP surface mount package. The device operates at 4MHz with a supply voltage range of 2.5V to 6V and includes integrated peripherals such as PWM, watchdog timer, and brown-out detection.

This part is classified as obsolete. Locating equivalent or substitute components is necessary to support legacy system maintenance, design updates, or when original inventory becomes unavailable. The PIC16LC64A-04I/PQ serves as a direct functional substitute while maintaining active product status.

Key Parameters

Parameter	Value
Core Processor	PIC
Core Size	8-Bit
Speed	4MHz
Program Memory Size	4.6KB (2K x 14)
Program Memory Type	OTP
RAM Size	128 x 8
Number of I/O	33
Voltage - Supply (Vcc/Vdd)	2.5V ~ 6V
Operating Temperature	-40°C ~ 85°C (TA)
Connectivity	I2C, SPI
Peripherals	Brown-out Detect/Reset, POR, PWM, WDT
Mounting Type	Surface Mount
Package / Case	44-QFP
Supplier Device Package	44-MQFP (10x10)

Substitute Part Grouping Explanation

Substitution of the PIC16LC64AT-04I/PQ is determined by strict equivalence across the following critical parameters:

Core Processor & Architecture: PIC 8-bit architecture
Program Memory: 4.6KB OTP (2K x 14)
RAM: 128 x 8 bytes
I/O Count: 33 pins
Operating Speed: 4MHz
Supply Voltage Range: 2.5V ~ 6V
Temperature Range: -40°C ~ 85°C
Package Type: 44-MQFP (10x10) / 44-QFP
Connectivity & Peripherals: I2C, SPI, PWM, WDT, Brown-out Detect/Reset, POR

The PIC16LC64A-04I/PQ meets all substitution criteria, maintaining identical electrical specifications, memory configuration, I/O architecture, and peripheral functionality. The primary distinction is product status: the substitute part is active, whereas the original is obsolete.

Parameter Comparison

Parameter	PIC16LC64AT-04I/PQ	PIC16LC64A-04I/PQ	Match
Manufacturer	Microchip Technology	Microchip Technology	✓
Series	PIC® 16C	PIC® 16C	✓
Core Processor	PIC	PIC	✓
Core Size	8-Bit	8-Bit	✓
Speed	4MHz	4MHz	✓
Program Memory Size	4.6KB (2K x 14)	4.6KB (2K x 14)	✓
Program Memory Type	OTP	OTP	✓
RAM Size	128 x 8	128 x 8	✓
Number of I/O	33	33	✓
Voltage - Supply (Vcc/Vdd)	2.5V ~ 6V	2.5V ~ 6V	✓
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	✓
Connectivity	I2C, SPI	I2C, SPI	✓
Peripherals	Brown-out Detect/Reset, POR, PWM, WDT	Brown-out Detect/Reset, POR, PWM, WDT	✓
Mounting Type	Surface Mount	Surface Mount	✓
Package / Case	44-QFP	44-QFP	✓
Supplier Device Package	44-MQFP (10x10)	44-MQFP (10x10)	✓
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	✓
Moisture Sensitivity Level (MSL)	3 (168 Hours)	3 (168 Hours)	✓
REACH Status	REACH Unaffected	REACH Unaffected	✓
Product Status	Obsolete	Active	Different
Packaging	Not specified	Tray	Different

Engineering Selection Recommendations

The PIC16LC64A-04I/PQ is a direct functional equivalent to the PIC16LC64AT-04I/PQ. All electrical parameters, memory architecture, I/O configuration, and peripheral functionality are identical. Both parts maintain ROHS3 compliance, REACH unaffected status, and identical moisture sensitivity ratings.

The primary advantage of selecting the PIC16LC64A-04I/PQ is its active product status with confirmed inventory availability (781 pieces in stock). The original part is obsolete, making the substitute the appropriate choice for new procurement or system maintenance requiring long-term component availability.

Packaging differs between the two parts: the substitute is supplied in trays, whereas the original packaging specification is not provided. This distinction does not affect electrical or mechanical compatibility and is a logistics consideration only.

Frequently Asked Questions (FAQ)

Q: Are the PIC16LC64AT-04I/PQ and PIC16LC64A-04I/PQ pin-compatible?

A: Yes. Both parts use the 44-MQFP (10x10) package with 44-QFP case designation. Pin count, arrangement, and electrical function are identical.

Q: Can the PIC16LC64A-04I/PQ replace the PIC16LC64AT-04I/PQ in existing designs?

A: Yes. The substitute part maintains identical electrical specifications, memory configuration, operating voltage range (2.5V ~ 6V), temperature range (-40°C ~ 85°C), and peripheral functionality. No design modifications are required.

Q: What is the difference between the two part numbers?

A: The primary difference is product status. The PIC16LC64AT-04I/PQ is obsolete, while the PIC16LC64A-04I/PQ is active. The "A" designation in the substitute part number indicates an updated version within the same product family. Both parts are functionally equivalent.

Q: Are there compliance or certification differences?

A: No. Both parts are ROHS3 compliant, REACH unaffected, and carry identical moisture sensitivity levels (MSL 3, 168 hours). Regulatory and environmental compliance is equivalent.

Q: What is the packaging difference?

A: The substitute part is supplied in trays, while the original part's packaging is not specified. This is a supply chain consideration and does not affect component performance or compatibility.

Q: Can I use the PIC16LC64A-04I/PQ in high-temperature applications?

A: Yes. The operating temperature range is -40°C ~ 85°C for both parts, supporting the same thermal envelope.

Q: Are the I/O and peripheral configurations identical?

A: Yes. Both parts provide 33 I/O pins, I2C and SPI connectivity, and identical peripherals: brown-out detect/reset, power-on reset (POR), PWM, and watchdog timer (WDT).

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