Microchip Technology SST39VF3201-70-4C-B3KE

Overview

SST39VF3201-70-4C-B3KE from Microchip Technology is a 32 Mbit (2M × 16) CMOS Multi-Purpose Flash Plus memory IC with single 2.7–3.6V supply operation, 70 ns read access time, bottom 32 KWord hardware block protection, and JEDEC-standard x16 asynchronous interface. It delivers fast Word-Program (7 µs typical), uniform sector-erase (2 KWord), and chip-erase (40 ms typical) for embedded firmware storage in industrial controllers and legacy communication modules.

For engineers reviewing the SST39VF3201-70-4C-B3KE datasheet, SST39VF3201-70-4C-B3KE pinout, SST39VF3201-70-4C-B3KE application, or SST39VF3201-70-4C-B3KE equivalent, key selection considerations include its bottom-boot block protection scheme, TSOP-48 package compatibility, 100,000-cycle endurance, Auto Low Power mode (3 µA standby), and CFI-compliant identification support.

Technical Context

This device implements SST's SuperFlash technology with split-gate cells and thick-oxide tunneling injectors, enabling fixed erase/program times independent of cycle count-unlike conventional flash where timing degrades over endurance life. Its command set conforms to JEDEC standard pinouts and includes six-byte sequences for sector/block/chip erase, plus Erase-Suspend/Resume for real-time read access during background erase.

The SST39VF3201-70-4C-B3KE supports dual status detection via DQ7 (Data# Polling) and DQ6/DQ2 (Toggle Bits), and integrates hardware write protection via WP# tied to the bottom 32 KWord boot block (000000H–007FFFH). RST# provides hardware reset to Read mode, while Security ID (128-bit factory + 128-bit user) enables device authentication and traceability.

Key Specifications

Pinout & Package

Package: 48-ball TFBGA (6 mm × 8 mm, B3K footprint), RoHS compliant, with bottom-side thermal pad not electrically connected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SST39VF3201B and MX29LV320ETTI-70G, the SST39VF3201-70-4C-B3KE offers unique bottom-boot hardware protection and Erase-Suspend-enabling safer field updates in safety-critical embedded systems where firmware integrity must be maintained during partial reprogramming.

Availability

SST39VF3201-70-4C-B3KE is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy telecom baseband modules, medical diagnostic BIOS, and avionics display controller boot memory requiring stable component supply across extended product lifecycles.

Supply support for SST39VF3201-70-4C-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 semiconductor company formed through the acquisition of Silicon Storage Technology (SST), specializing in nonvolatile memory, microcontrollers, and analog products.

The SST39VF3201-70-4C-B3KE belongs to the Multi-Purpose Flash Plus (MPF+) product line, designed specifically for cost-sensitive, high-reliability embedded applications requiring field-upgradable firmware with hardware-level security and long-term data retention.

FAQ

What is the memory organization and total capacity of the SST39VF3201-70-4C-B3KE?

The SST39VF3201-70-4C-B3KE is organized as 2M × 16, delivering 32 Mbit (4 MB) of nonvolatile storage. Its address range spans 000000H to 3FFFFFH, with bottom 32 KWord (000000H–007FFFH) protected by hardware when WP# is grounded. This structure supports direct x16 bus interfacing with microcontrollers and DSPs without data width translation.

Does the SST39VF3201-70-4C-B3KE support hardware write protection, and how is it configured?

Yes, the SST39VF3201-70-4C-B3KE implements bottom hardware block protection on the lowest 32 KWord (000000H–007FFFH). Protection is activated when the WP# pin is driven low; if left floating, an internal pull-up holds WP# high, disabling protection. This scheme prevents accidental erasure or programming of boot code during system power transitions or firmware updates.

How does the SST39VF3201-70-4C-B3KE indicate completion of a Program or Erase operation?

The SST39VF3201-70-4C-B3KE provides two real-time status mechanisms: Data# Polling (DQ7 toggles until completion, then reflects true data) and Toggle Bits (DQ6 toggles during operation, stops when complete). Both are valid after the rising edge of the fourth WE# pulse for Program and sixth WE# pulse for Erase operations-enabling efficient polling without fixed delays.

Is the SST39VF3201-70-4C-B3KE pin-compatible with other devices in the SST39VF320x family?

Yes, the SST39VF3201-70-4C-B3KE shares identical pinout and command set with SST39VF3202, differing only in boot-block location (bottom vs. top) and device ID (235BH vs. 235AH). Both use the same 48-ball TFBGA (B3K) or 48-lead TSOP packages and JEDEC x16 interface, allowing layout reuse across variants where boot architecture permits.

What is the purpose and implementation of the Security ID feature in the SST39VF3201-70-4C-B3KE?

The SST39VF3201-70-4C-B3KE includes a 256-bit Security ID: 128 bits factory-programmed and locked by SST, and 128 bits user-programmable. Accessed via 0x88 command, it enables device authentication and traceability. The user segment is programmed using the Security ID Word-Program command and can be permanently locked with User Sec ID Program Lock-Out to prevent tampering-critical for regulated medical and defense applications.