Texas Instruments SM28VLT32SKGD3

Overview

SM28VLT32SKGD3 from Texas Instruments is a 32-Mbit high-temperature serial flash memory with SPI interface (Mode 0/3), 2-M × 16-bit organization, 12-MHz max clock, and dual-supply operation (3.3-V IO / 1.9-V core). It delivers asynchronous read/write/erase in down-hole drilling and seismic data acquisition systems operating continuously at –55°C to 210°C.

For engineers reviewing the SM28VLT32SKGD3 datasheet, SM28VLT32SKGD3 pinout, SM28VLT32SKGD3 application, or SM28VLT32SKGD3 equivalent, key selection factors include extreme-temperature qualification (1000 hrs @ 210°C), sector-level hardware write protection via WP#, HOLD#-enabled SPI freeze, and KGD die form factor for hermetic module integration.

Technical Context

The SM28VLT32SKGD3 implements an SPI-compatible flash controller supporting Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1), with CS#-gated communication and HOLD#-initiated transaction suspension. Its architecture partitions memory into 2-M word sectors, requiring 21-bit addressing and enabling burst read/write via auto-incrementing address pointers.

It features dual-voltage operation: VIO (3.1–3.6 V) powers I/O circuitry including SCK/SI/SO/CS#/HOLD#/WP#/RST#/FLCLK, while VCORE (1.8–1.98 V) supplies the flash array and pump. Erase operations are restricted to –55°C to 125°C per specification, and WP# assertion disables all program/erase commands regardless of temperature.

Key Specifications

Pinout & Package

KGD (Known Good Die) package: bare silicon die with 150-µm bond pad pitch, 381-µm thickness, AlCu/TiN metallization, and floating or grounded substrate. Not housed in leaded or laminate carrier; requires custom assembly into hermetic modules.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-temperature serial flash memory applications.

Compared with AT25DF321A-SSH-B and MX25L3233FZNI-10G, the SM28VLT32SKGD3 uniquely delivers verified 210°C junction operation, KGD form factor for hermetic packaging, and hardware-controlled timing flexibility - making it the sole option for uncooled, embedded high-temperature data logging.

Availability

SM28VLT32SKGD3 is available at Aetrix Electronics and suitable for down-hole drilling sensors, seismic data recorders, and aerospace engine monitoring systems requiring stable component supply across extended temperature extremes and long product lifecycles.

Supply support for SM28VLT32SKGD3 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

Texas Instruments is a global semiconductor company specializing in analog, embedded processing, and high-reliability products, with leadership in automotive, industrial, and aerospace markets.

The SM28VLT32SKGD3 belongs to TI's high-temperature flash memory product line, engineered specifically for data acquisition and firmware storage in environments where conventional flash fails - targeting energy exploration, geophysical sensing, and propulsion system monitoring.

FAQ

What is the maximum continuous operating temperature for SM28VLT32SKGD3?

The SM28VLT32SKGD3 is characterized and qualified for continuous operation at a junction temperature of –55°C to 210°C, with 1000 hours of life validation at the maximum 210°C rating. This exceeds standard industrial or automotive flash specifications and is confirmed by TI's reliability modeling and qualification testing per SLVSAO2C.

Does SM28VLT32SKGD3 support standard SPI modes, and how is communication initiated?

Yes, SM28VLT32SKGD3 supports SPI Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1). Communication begins when CS# is asserted low; SCK then clocks SI data (command/address/data) into the device, and SO returns the quick status byte followed by requested data. All activity is ignored when CS# is high.

How does the WP# pin function on SM28VLT32SKGD3, and what operations does it disable?

The WP# pin on SM28VLT32SKGD3 is an active-low hardware write protect. When WP# is low, all erase and program operations are inhibited - including sector erase, word write, and register writes - regardless of temperature or command sequence. Read operations remain fully functional.

What is the purpose of the FLCLK pin on SM28VLT32SKGD3, and can its frequency be adjusted?

The FLCLK pin on SM28VLT32SKGD3 provides the internal clock source for flash pump and timing-critical erase/program algorithms. Its default frequency is 12 MHz, but it can be scaled down to 2 MHz using memory-mapped register writes (e.g., addresses F004, 8006–8018) to maintain algorithm integrity at lower power levels.

Is SM28VLT32SKGD3 supplied in a packaged format, or is it only available as bare die?

SM28VLT32SKGD3 is exclusively offered as a Known Good Die (KGD) in XCEPT format - no leaded or laminate package. It features defined bond pad coordinates, AlCu/TiN metallization, and 381-µm thickness, intended for direct integration into custom hermetic modules via wire bonding or flip-chip assembly.