AT89LP4052-16SI Equivalent & Substitute Parts

Part Overview

The AT89LP4052-16SI is an 8-bit microcontroller from Microchip Technology's 89LP series, featuring a 16MHz clock speed, 4KB FLASH program memory, and 256 bytes of RAM. This device is classified as obsolete, making substitute parts necessary for new designs and ongoing production requirements. The 20-SOIC surface mount package provides compact integration for embedded applications requiring SPI and UART/USART connectivity with integrated peripherals including brown-out detection, power-on reset, PWM, and watchdog timer functionality.

Substiute Parts

AT89LP4052-16SI

Microchip TechnologyIn Stock: 1088AT89LP4052-16SI Datasheet

Current PartRFQ

AT89LP4052-20SU

Microchip TechnologyIn Stock: 1980AT89LP4052-20SU Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the AT89LP4052-16SI is determined by strict equivalence across the following critical parameters:

• Core Architecture: 8051-based processor (mandatory for code compatibility)
• Memory Configuration: 4KB FLASH program memory and 256 bytes RAM (functional requirement)
• Package Type: 20-SOIC surface mount (mechanical and electrical compatibility)
• Voltage Range: 2.4V ~ 5.5V supply (power system compatibility)
• I/O Count: 15 I/O pins (pinout compatibility)
• Connectivity Interfaces: SPI and UART/USART (peripheral compatibility)
• Peripheral Set: Brown-out Detect/Reset, POR, PWM, WDT (functional equivalence)
• Operating Temperature: -40°C ~ 85°C (environmental specification)

The AT89LP4052-20SU qualifies as a direct substitute based on identical core architecture, memory, package, voltage range, I/O count, connectivity, peripherals, and operating temperature. The primary difference is the increased clock speed (20MHz versus 16MHz), which represents an enhancement rather than a limitation for substitution purposes.

Parameter Comparison

Engineering Selection Recommendations

The AT89LP4052-20SU is a qualified substitute for the AT89LP4052-16SI based on the following engineering criteria:

Product Status: The AT89LP4052-16SI is classified as obsolete, while the AT89LP4052-20SU maintains active product status with current manufacturing availability (1900 pcs in stock versus 990 pcs for the obsolete variant).

Compliance and Certifications: The AT89LP4052-20SU achieves ROHS3 compliance, whereas the AT89LP4052-16SI is RoHS non-compliant. Both devices maintain REACH Unaffected status and EAR99 export classification. The MSL rating of 2 (1 Year) is identical for both parts.

Performance Enhancement: The AT89LP4052-20SU operates at 20MHz compared to the 16MHz of the main part. This represents a 25% speed increase while maintaining full backward compatibility with the 8051 instruction set, identical memory configuration, and equivalent peripheral functionality. The higher clock speed does not introduce any functional incompatibility for applications designed for the 16MHz variant.

Electrical and Mechanical Equivalence: Both parts share identical voltage supply range (2.4V ~ 5.5V), I/O count (15), package type (20-SOIC), and operating temperature range (-40°C ~ 85°C). Pin-to-pin compatibility is maintained.

Frequently Asked Questions (FAQ)

Q: Can the AT89LP4052-20SU directly replace the AT89LP4052-16SI in existing designs?

A: Yes. The AT89LP4052-20SU is pin-to-pin compatible and functionally equivalent. The 20MHz clock speed is a performance enhancement that does not affect compatibility with designs specified for 16MHz operation. No circuit modifications are required.

Q: What is the primary difference between these two parts?

A: The AT89LP4052-20SU operates at 20MHz versus 16MHz for the AT89LP4052-16SI. All other electrical, mechanical, and functional parameters are identical. The substitute part also offers improved product status (active versus obsolete) and RoHS3 compliance.

Q: Are there any timing considerations when substituting the AT89LP4052-20SU for the AT89LP4052-16SI?

A: The higher clock speed of the AT89LP4052-20SU may affect timing-sensitive applications. Applications with strict timing requirements should be evaluated to confirm that the increased clock speed does not introduce timing violations. For most standard embedded applications, the higher speed provides improved performance without adverse effects.

Q: What is the packaging difference between these parts?

A: Both parts use identical 20-SOIC surface mount packaging (0.295", 7.50mm Width). No PCB layout modifications are necessary.

Q: Is the AT89LP4052-20SU available in the same quantities as the AT89LP4052-16SI?

A: The AT89LP4052-20SU has higher current inventory availability (1900 pcs) compared to the AT89LP4052-16SI (990 pcs). Additionally, the substitute part maintains active product status, ensuring continued availability for future production requirements.

Q: What are the compliance differences between these parts?

A: The AT89LP4052-20SU is ROHS3 compliant, while the AT89LP4052-16SI is RoHS non-compliant. Both maintain REACH Unaffected status. For applications requiring RoHS compliance, the AT89LP4052-20SU is the appropriate selection.