SST25LF040A-33-4C-S2AT – Serial NOR Flash – Microchip

The SST25LF040A-33-4C-S2AT is a 4 Mbit SPI Serial NOR Flash memory from Microchip (formerly SST), featuring a 33 MHz SuperFlash interface in an 8-lead SOIC package. This is an obsolete, hard-to-find part available for RFQ.

The SST25LF040A-33-4C-S2AT is a 4 Mbit (512K x 8) SPI Serial NOR Flash memory device originally developed by Silicon Storage Technology (SST), now part of Microchip Technology. Manufactured using SST’s proprietary, high-performance CMOS SuperFlash technology, the SST25LF040A delivers a four-wire SPI-compatible interface that minimizes pin count and conserves board space, making it well suited for code storage and embedded data applications. The “-33-4C-S2A” ordering designators indicate a 33 MHz maximum clock speed, commercial temperature grade, and an 8-lead SOIC (200 mil) package; the trailing letter denotes the shipping/packing option.

Key Features

• 4 Mbit density, organized as 512K x 8 (byte-addressable)
• SPI-compatible serial interface (Mode 0 and Mode 3)
• 33 MHz maximum clock frequency
• Single 3.0-3.6V read and write supply voltage
• Uniform 4 KByte sectors and uniform 32 KByte overlay blocks for flexible erase
• Software write protection via Block-Protection bits (BP1, BP0, BPL) and a WP# Write Protect pin
• Endurance: 100,000 cycles (typical)
• Data retention: greater than 100 years
• Low power: 7 mA typical active read current; chip-erase time 70 ms typical
• 8-lead SOIC (200 mil) package
• SST SuperFlash CMOS technology

Applications

• Embedded boot code and firmware storage
• Networking and telecom equipment
• Industrial control and instrumentation
• Set-top boxes and consumer electronics
• Configuration data storage for FPGAs and ASICs
• Legacy system maintenance and repair

Why Source SST25LF040A-33-4C-S2AT from Pacific Component Xchange

The SST25LF040A-33-4C-S2AT is an obsolete device that is no longer in active production, with little to no authorized-distributor availability. Pacific Component Xchange specializes in sourcing hard-to-find and end-of-life memory components like this one, helping engineers and procurement teams keep legacy designs and long-lifecycle products in production. We support authenticity verification and inspection on scarce parts, offer global shipping, and maintain dedicated inventory for obsolete memory. Request a quote (RFQ) today and our team will confirm current stock, lead time, and pricing for your required quantity.