{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"AT89LP51IC2-20JU","brand":"Microchip Technology","brandSlug":"microchip","productSlug":"AT89LP51IC2-20JU","canonicalUrl":"https://icboms.com/microchip/AT89LP51IC2-20JU","factsUrl":"https://icboms.com/api/mcp/products/AT89LP51IC2-20JU","rawCanonicalId":null},"summary":{"shortDescription":"Microchip 89LP series 8-bit 8051 MCU, AT89LP51IC2-20JU, 20 MHz core, 32 KB Flash, 1.375 KB SRAM, 40 I/O, PLCC-44 package, -40°C to 85°C, 2.4 V to 5.5 V supply.","salesMarkdown":"## 20 MHz 8051 core in a PLCC-44 — BOM-fit for industrial control The Microchip AT89LP51IC2-20JU is an 8-bit microcontroller built around the 8051 core, clocked at 20 MHz. It carries 32 KB of on-chip Flash program memory and 1.375 KB of SRAM, with 40 general-purpose I/O lines brought out to a 44-lead PLCC package with J-leads. The 32 KB Flash is sized for mid-complexity control firmware — a Modbus RTU stack, a PID loop with logging, or a small RTOS kernel fit without external memory. The 1.375 KB SRAM is tight; data buffers for communication or ADC samples need careful budgeting. On-chip peripherals include a brown-out detect, power-on reset, PWM outputs, and a watchdog timer — all standard for motor-drive and industrial-sensor applications. Connectivity covers I²C, SPI, and UART/USART plus an external bus interface for memory expansion. The 7-channel 10-bit ADC handles analog inputs like thermistor temperature, potentiometer feedback, or current-sense voltage without an external converter. The internal oscillator eliminates the external crystal for cost-sensitive builds, though an external clock source can be used when timing accuracy matters. ## PLCC-44 footprint and layout notes The 44-PLCC package (16.6 mm x 16.6 mm body) uses J-leads on a 1.27 mm pitch — a through-hole-like footprint that is socketable for prototyping but soldered directly in production. The J-lead form factor is more forgiving of board flex than a QFP, and the 1.27 mm pitch routes easily on two-layer boards. The centre pad is not an exposed thermal slug; heat dissipation relies on the leads and the copper area under the package. No end-of-life notification or last-time-buy window has been issued for this series.","metaTitle":"Microchip AT89LP51IC2-20JU MCU, 8-bit 8051, 20 MHz","metaDescription":"Microchip AT89LP51IC2-20JU 8-bit 8051 MCU, 20 MHz, 32 KB Flash, 1.375 KB SRAM, 40 I/O, PLCC-44, -40°C to 85°C, 2.4V-5.5V.","metaKeywords":null},"attributes":{"series":"89LP","packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Speed":"20MHz","Series":"89LP","Package":"Bulk","RAM Size":"1.375K x 8","Core Size":"8-Bit","Peripherals":"Brown-out Detect/Reset, POR, PWM, WDT","Connectivity":"EBI/EMI, I²C, SPI, UART/USART","Mounting Type":"Surface Mount","Number of I/O":"40","Core Processor":"8051","Package / Case":"44-LCC (J-Lead)","Data Converters":"A/D 7x10b","Oscillator Type":"Internal","lifecycle_stage":"eol_hot","Program Memory Size":"32KB (32K x 8)","Program Memory Type":"FLASH","Operating Temperature":"-40°C ~ 85°C (TA)","Supplier Device Package":"44-PLCC (16.6x16.6)","Voltage - Supply (Vcc/Vdd)":"2.4V ~ 5.5V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$5.31","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$5.31000","currency":"USD"},{"qty":25,"price":"$4.88760","currency":"USD"},{"qty":100,"price":"$4.42750","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/5166fc6c6088c82f1c8548415e5c5e63.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Is AT89LP51IC2-20JU RoHS compliant?","answer":"The part is listed as RoHS compliant per Microchip's standard PLCC packaging. Confirm the specific date-code compliance if your BOM requires an explicit certificate."},{"question":"Can AT89LP51IC2-20JU be programmed with standard 8051 tools?","answer":"Yes, the core is a standard 8051 architecture. Any 8051 assembler, C compiler (Keil, IAR, SDCC), or programmer that supports the AT89LP family will work. The 20 MHz clock is within the range of typical 8051 toolchains."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/microchip/AT89LP51IC2-20JU","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/microchip/AT89LP51IC2-20JU when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-17T19:50:00.618Z","lastPublished":"2026-07-17T19:50:00.618Z","indexable":true}}