Microchip Technology SST39VF020-70-4I-B3KE

Overview

SST39VF020-70-4I-B3KE from Microchip Technology is a 2 Mbit (256K × 8) CMOS Multi-Purpose Flash memory IC with 2.7–3.6 V single-supply write operation, 70 ns read access time, and uniform 4 KB sector-erase architecture. It implements SuperFlash technology with split-gate cells for high reliability and is commonly used in embedded firmware storage, BIOS/UEFI code storage, and industrial controller configuration memory.

For engineers reviewing the SST39VF020-70-4I-B3KE datasheet, SST39VF020-70-4I-B3KE pinout, SST39VF020-70-4I-B3KE application, or SST39VF020-70-4I-B3KE equivalent, key selection criteria include voltage range compatibility (2.7–3.6 V), industrial temperature support (−40°C to +85°C), JEDEC-standard x8 parallel interface, and software/hardware data protection features.

Technical Context

This device belongs to the SST39VF family of parallel-interface flash memories using proprietary SuperFlash technology-featuring thick-oxide tunneling injectors and split-gate cell design for enhanced endurance and data retention. It supports standard JEDEC command sets for byte-program, sector-erase, and chip-erase operations via CE#/OE#/WE# control logic.

Operation relies on latched address/data buses and includes dual end-of-write detection methods: Data# Polling (DQ7) and Toggle Bit (DQ6). The device requires a six-byte software command sequence for sector or chip erase, and a three-byte sequence for byte programming, all compliant with JEDEC-standard flash protocols.

Key Specifications

Pinout & Package

Package: 48-ball Thin Fine-Pitch Ball Grid Array (TFBGA), 6 mm × 8 mm, 0.8 mm ball pitch, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar flash memory applications.

Compared with AT29LV020-70PU and S29AL002DT90BAIR10, the SST39VF020-70-4I-B3KE uniquely combines 2.7 V minimum operation, industrial temperature support, 70 ns speed, and dual-status detection-enabling drop-in replacement in demanding embedded designs without driver or timing redesign.

Availability

SST39VF020-70-4I-B3KE is available at Aetrix Electronics and suitable for industrial control systems, medical diagnostics equipment, automotive body electronics, and network infrastructure requiring stable component supply and long-term obsolescence management.

Supply support for SST39VF020-70-4I-B3KE includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microchip Technology is a global provider of microcontrollers, analog components, and memory solutions, acquired Silicon Storage Technology (SST) in 2010 to expand its nonvolatile memory portfolio.

The SST39VF series was designed specifically for cost-sensitive, high-reliability embedded applications requiring parallel flash with robust data protection, wide voltage operation, and long-term data retention-targeting industrial, automotive, and networking markets.

FAQ

What is the exact memory organization of the SST39VF020-70-4I-B3KE?

The SST39VF020-70-4I-B3KE is organized as 256K × 8, delivering 2 Mbit (262,144 bytes) of addressable storage space. Its address bus supports A0–A16 (17 address lines), with A17 reserved but unused in this density variant. This structure aligns with JEDEC-standard x8 parallel flash interfaces and enables direct mapping to 8-bit microcontroller external memory buses.

Does the SST39VF020-70-4I-B3KE support both CE#- and WE#-controlled write operations?

Yes, the SST39VF020-70-4I-B3KE fully supports both CE#- and WE#-controlled write operations, as confirmed in Figures 7 and 8 of the DS25023A datasheet. Either signal can initiate byte-program, sector-erase, or chip-erase sequences, provided minimum pulse width and setup/hold timing requirements (e.g., TWP ≥ 40 ns, TCP ≥ 40 ns) are met in the host system design.

What is the purpose of the NC balls on the 48-ball TFBGA package of the SST39VF020-70-4I-B3KE?

The NC (No Connect) balls on the SST39VF020-70-4I-B3KE's 48-ball TFBGA package-including A1, A5, B3, and others listed in Figure 4-are internally unconnected and must remain floating in PCB layout. They exist for mechanical symmetry, package standardization across the SST39LF/VF family, and future density scalability-not for electrical functionality in this specific part.

How does the SST39VF020-70-4I-B3KE handle power-up write inhibition?

The SST39VF020-70-4I-B3KE incorporates hardware-level power-up write inhibition: write operations are automatically disabled when VDD falls below 1.5 V, and noise/glitch protection ignores WE# or CE# pulses shorter than 5 ns. This prevents spurious writes during power ramp-up or brown-out conditions-ensuring data integrity without requiring external reset supervision circuits.

Can the SST39VF020-70-4I-B3KE be used in place of the SST39VF020-70-4C-B3KE?

Yes, the SST39VF020-70-4I-B3KE is functionally identical to the SST39VF020-70-4C-B3KE except for temperature grade: 'I' denotes industrial (−40°C to +85°C), while 'C' denotes commercial (0°C to +70°C). All timing, command sets, pinouts, and electrical characteristics are identical-making the 'I' version a direct upgrade for extended-temperature applications without PCB or firmware changes.