AT89LP828-20JU Equivalent & Substitute Parts

Part Overview

The AT89LP828-20JU is an 8051-based 8-bit microcontroller manufactured by Microchip Technology, featuring 8KB FLASH program memory, 1KB EEPROM, and 768 bytes of RAM. Operating at 20MHz with a supply voltage range of 2.4V to 5.5V, this device integrates SPI and UART/USART connectivity alongside peripherals including brown-out detection, power-on reset, PWM, and watchdog timer functionality. The part is packaged in a 32-PLCC (J-Lead) surface mount configuration with 30 I/O pins and operates across the industrial temperature range of -40°C to 85°C.

The AT89LP828-20JU is classified as obsolete. Identifying equivalent substitute parts becomes necessary when original inventory is depleted or when design flexibility permits package format changes while maintaining core electrical and functional compatibility.

Key Parameters

Parameter	Value
Core Processor	8051
Core Size	8-Bit
Speed	20MHz
Program Memory Size	8KB (8K x 8)
Program Memory Type	FLASH
EEPROM Size	1K x 8
RAM Size	768 x 8
Voltage Supply (Vcc/Vdd)	2.4V ~ 5.5V
Number of I/O	30
Connectivity	SPI, UART/USART
Peripherals	Brown-out Detect/Reset, POR, PWM, WDT
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Oscillator Type	Internal

Substitute Part Grouping Explanation

Substitution of the AT89LP828-20JU is determined by strict equivalence across the following electrical and functional parameters:

Core processor architecture (8051)
Core size (8-Bit)
Operating frequency (20MHz)
Program memory capacity and type (8KB FLASH)
EEPROM capacity (1K x 8)
RAM capacity (768 x 8)
Supply voltage range (2.4V ~ 5.5V)
I/O pin count (30)
Connectivity interfaces (SPI, UART/USART)
Peripheral feature set (Brown-out Detect/Reset, POR, PWM, WDT)
Operating temperature range (-40°C ~ 85°C)

The AT89LP828-20AU qualifies as a direct substitute based on identical electrical specifications and functional capabilities. The primary difference is the package format: the substitute uses 32-TQFP (7x7mm) surface mount packaging instead of the original 32-PLCC (J-Lead) format. Both parts share the same base product number (AT89LP828) and maintain full compatibility at the functional and electrical level.

Parameter Comparison

Parameter	AT89LP828-20JU (Original)	AT89LP828-20AU (Substitute)
Manufacturer	Microchip Technology	Atmel
Core Processor	8051	8051
Core Size	8-Bit	8-Bit
Speed	20MHz	20MHz
Program Memory Size	8KB (8K x 8)	8KB (8K x 8)
Program Memory Type	FLASH	FLASH
EEPROM Size	1K x 8	1K x 8
RAM Size	768 x 8	768 x 8
Voltage Supply (Vcc/Vdd)	2.4V ~ 5.5V	2.4V ~ 5.5V
Number of I/O	30	30
Connectivity	SPI, UART/USART	SPI, UART/USART
Peripherals	Brown-out Detect/Reset, POR, PWM, WDT	Brown-out Detect/Reset, POR, PWM, WDT
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount	Surface Mount
Oscillator Type	Internal	Internal
Package / Case	32-LCC (J-Lead)	32-TQFP
Supplier Device Package	32-PLCC (13.97x11.43)	32-TQFP (7x7)
Product Status	Obsolete	Active
RoHS Status	ROHS3 Compliant	Not specified
REACH Status	REACH Unaffected	Not specified
ECCN	EAR99	EAR99
HTSUS	8542.31.0001	8542.31.0001

Engineering Selection Recommendations

The AT89LP828-20AU is an active product with identical electrical and functional specifications to the obsolete AT89LP828-20JU. Selection of the substitute part is appropriate when:

Original AT89LP828-20JU inventory is unavailable
Design permits accommodation of the 32-TQFP package footprint in place of the 32-PLCC format
PCB layout and mechanical constraints allow transition from the larger PLCC package (13.97x11.43mm) to the smaller TQFP package (7x7mm)

The substitute maintains full compatibility with existing firmware and application code. No electrical redesign is required. The transition from PLCC to TQFP packaging represents a reduction in board space and may offer manufacturing advantages in high-volume production environments.

Frequently Asked Questions (FAQ)

Q: Are the AT89LP828-20JU and AT89LP828-20AU electrically identical?

A: Yes. Both parts share identical core processor architecture, memory configuration, operating frequency, supply voltage range, I/O count, connectivity interfaces, and peripheral feature set. Electrical compatibility is complete.

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

A: The package format differs. The AT89LP828-20JU uses 32-PLCC (J-Lead) packaging, while the AT89LP828-20AU uses 32-TQFP packaging. Both are surface mount configurations with 30 I/O pins.

Q: Can I use the AT89LP828-20AU as a direct replacement on an existing PCB designed for the AT89LP828-20JU?

A: No. The different package formats require different PCB footprints. A new PCB layout is necessary to accommodate the 32-TQFP footprint. However, no changes to firmware, application code, or electrical design are required.

Q: What are the physical dimensions of each package?

A: The AT89LP828-20JU 32-PLCC package measures 13.97 x 11.43mm. The AT89LP828-20AU 32-TQFP package measures 7 x 7mm. The TQFP format provides a smaller footprint.

Q: Is the AT89LP828-20AU currently available?

A: Yes. The AT89LP828-20AU is classified as an active product with reported inventory of 1453 pieces in stock, compared to the obsolete AT89LP828-20JU status.

Q: Are there compliance or certification differences between these parts?

A: The AT89LP828-20JU is specified as ROHS3 Compliant and REACH Unaffected. Compliance specifications for the AT89LP828-20AU are not provided in the available data.

Q: Can firmware developed for the AT89LP828-20JU run on the AT89LP828-20AU without modification?

A: Yes. Both parts implement the same 8051 core processor architecture with identical memory configuration and peripheral feature set. Firmware compatibility is complete.

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