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Home > Products > Integrated Circuits (ICs) > Memory > Memory

Microchip Technology SST39WF400A-90-4I-M1QE-T

Name: SST39WF400A-90-4I-M1QE-T
Brand: Microchip Technology
SKU: SST39WF400A-90-4I-M1QE-T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SST39WF400A-90-4I-M1QE-T

Manufacturer:: Microchip Technology

Category:: Memory

Package:: 48-WFBGA

Datasheet:: SST39WF400A-90-4I-M1QE-T.pdf

Description:: IC FLASH 4MBIT PARALLEL 48WFBGA

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Product details

Overview

SST39WF400A-90-4I-M1QE-T from Silicon Storage Technology is a 4 Mbit (256K × 16) single-voltage Multi-Purpose Flash memory IC with 1.65–1.95 V operation, 90 ns read access time, and JEDEC-standard x16 asynchronous interface. It delivers 100,000 program/erase cycles and >100 years data retention, targeting firmware storage in industrial microcontroller systems requiring low-power, high-reliability nonvolatile memory.

For engineers reviewing the SST39WF400A-90-4I-M1QE-T datasheet, SST39WF400A-90-4I-M1QE-T pinout, SST39WF400A-90-4I-M1QE-T application, or SST39WF400A-90-4I-M1QE-T equivalent, this page provides verified package mapping (48-ball TFBGA), validated sector/block-erase timing (36 ms typical), Word-Program timing (28 µs typical), SuperFlash reliability metrics, and JEDEC-compliant command set implementation details.

Technical Context

The SST39WF400A-90-4I-M1QE-T implements SST's proprietary SuperFlash split-gate cell technology with thick-oxide tunneling injector, enabling fixed erase/program times independent of cycle count-unlike conventional flash where timing degrades over endurance life. It supports three software-controlled operations: Word-Program (28 µs typ), Sector-Erase (2 KWord uniform sectors), and Block-Erase (32 KWord uniform blocks).

Operation relies on standard microprocessor write sequences with CE#, OE#, and WE# control logic; latched address/data timing follows JEDEC x16 flash conventions. End-of-write detection uses dual methods: Data# Polling (DQ7) and Toggle Bit (DQ6), both valid after rising edge of fourth (Program) or sixth (Erase) WE#/CE# pulse.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Organization	256K × 16 (4 Mbit total); enables 16-bit parallel data bus interfacing with MCUs and SoCs without external data-width conversion.
Read Access Time	90 ns (guaranteed at 1.70–1.95 V); meets real-time boot code fetch latency requirements for industrial controllers.
Supply Voltage	1.65–1.95 V; compatible with 1.8 V core logic rails and eliminates need for dedicated higher-voltage programming supplies.
Endurance	100,000 program/erase cycles (typical); supports frequent field firmware updates in remote monitoring devices.
Data Retention	>100 years at 25°C; ensures long-term integrity of calibration data and configuration parameters in unattended equipment.
Word-Program Time	28 µs (typical); reduces firmware patch duration and minimizes system downtime during in-field updates.
Sector/Block Erase	Uniform 2 KWord sectors / 32 KWord blocks; enables granular update of application code sections without full chip erase.

Pinout & Package

Package: 48-ball Thin Fine-Pitch Ball Grid Array (TFBGA), 6 mm × 8 mm footprint, 0.5 mm ball pitch - optimized for space-constrained industrial PCB layouts.

Pin/Terminal	Circuit Role	Design Meaning
A0–A17	Address Inputs	A0–A16 select 256K words; A17 (AMS) used for sector/block address decoding in erase commands per JEDEC standard.
DQ0–DQ15	Data I/O	16-bit bidirectional data bus; tri-stated when CE# or OE# is high to prevent bus contention during standby.
CE#	Chip Enable	Active-low device selection signal; must be low for read, program, or erase operations; controls power state transition.
OE#	Output Enable	Active-low output gate; enables data output only when CE# is also low; decouples memory access from address setup timing.
WE#	Write Enable	Active-low control for latching address/data and initiating internal program/erase cycles; defines timing edges for command sequencing.
VDD	Power Supply	1.65–1.95 V supply input; powers all internal logic and SuperFlash array; internally generates VPP for tunneling.
VSS	Ground	Reference ground for all I/O and core circuitry; two dedicated VSS balls ensure low-impedance return path for noise-sensitive operations.
NC	No Connection	Unbonded pins (e.g., A9 in TFBGA layout); must remain unconnected to avoid unintended electrical coupling or ESD paths.

Key Features

Feature	Design Value
SuperFlash Technology	Split-gate cell with thick-oxide injector enables fixed 28 µs program and 36 ms erase times across full 100k-cycle lifetime-no software derating required.
JEDEC x16 Command Set	Fully compliant with industry-standard flash command protocols (e.g., 6-byte sector erase: 5555H/AAH → 2AAAH/55H → 5555H/80H → 5555H/AAH → 2AAAH/55H → SAX/30H).
Software Data Protection	Three-byte unlock sequence for program + six-byte unlock for erase prevents accidental writes during power-up/down transients or noise events.
End-of-Write Detection	Dual-mode status reporting via DQ7 (Data# Polling) and DQ6 (Toggle Bit), both accessible without halting host CPU during internal operations.
CFI Query Support	Standard Common Flash Interface data table (accessible via 5555H/AAH → 2AAAH/55H → 5555H/98H) enables automatic driver configuration in embedded OS environments.

Applications

Industrial PLC Firmware Storage	Medical Device Configuration Memory
Use Scenario: Storing and updating ladder logic firmware in programmable logic controllers deployed in factory automation lines. IC Role / Device Role / Timing Role: Nonvolatile program memory mapped into MCU address space; accessed via 16-bit parallel bus during boot and runtime reconfiguration. Use Value: 90 ns read access ensures deterministic boot timing; 100,000-cycle endurance supports quarterly firmware patches over 10+ year product lifecycle.	Use Scenario: Holding calibrated sensor offsets, user preferences, and regulatory audit logs in portable diagnostic equipment. IC Role / Device Role / Timing Role: Configuration and data logging memory with guaranteed >100-year retention under battery-backed standby conditions. Use Value: Single 1.8 V supply simplifies power design; sector-erase capability allows safe overwrite of patient-specific settings without erasing calibration constants.
Telecom Base Station Bootloader	Automotive Infotainment OTA Update Cache
Use Scenario: Hosting secure bootloader images in wireless infrastructure units requiring FIPS-compliant firmware integrity verification. IC Role / Device Role / Timing Role: Read-critical boot memory with hardware write protection; accessed during cold start before DRAM initialization. Use Value: 1.65–1.95 V operation matches telecom ASIC I/O voltage; CFI support enables standardized flash abstraction layer in bootloader firmware.	Use Scenario: Temporary staging area for over-the-air software updates prior to validation and atomic swap in vehicle infotainment head units. IC Role / Device Role / Timing Role: High-endurance scratchpad memory supporting repeated download/verify/commit cycles during multi-stage OTA workflows. Use Value: 32 KWord block-erase enables fast reset of update cache; 28 µs word-program minimizes time spent in critical update window.

Industrial PLC Firmware Storage

Medical Device Configuration Memory

Use Scenario: Storing and updating ladder logic firmware in programmable logic controllers deployed in factory automation lines.

IC Role / Device Role / Timing Role: Nonvolatile program memory mapped into MCU address space; accessed via 16-bit parallel bus during boot and runtime reconfiguration.

Use Value: 90 ns read access ensures deterministic boot timing; 100,000-cycle endurance supports quarterly firmware patches over 10+ year product lifecycle.

Use Scenario: Holding calibrated sensor offsets, user preferences, and regulatory audit logs in portable diagnostic equipment.

IC Role / Device Role / Timing Role: Configuration and data logging memory with guaranteed >100-year retention under battery-backed standby conditions.

Use Value: Single 1.8 V supply simplifies power design; sector-erase capability allows safe overwrite of patient-specific settings without erasing calibration constants.

Telecom Base Station Bootloader

Automotive Infotainment OTA Update Cache

Use Scenario: Hosting secure bootloader images in wireless infrastructure units requiring FIPS-compliant firmware integrity verification.

IC Role / Device Role / Timing Role: Read-critical boot memory with hardware write protection; accessed during cold start before DRAM initialization.

Use Value: 1.65–1.95 V operation matches telecom ASIC I/O voltage; CFI support enables standardized flash abstraction layer in bootloader firmware.

Use Scenario: Temporary staging area for over-the-air software updates prior to validation and atomic swap in vehicle infotainment head units.

IC Role / Device Role / Timing Role: High-endurance scratchpad memory supporting repeated download/verify/commit cycles during multi-stage OTA workflows.

Use Value: 32 KWord block-erase enables fast reset of update cache; 28 µs word-program minimizes time spent in critical update window.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MX29LV400CBTI-90G	4 Mbit x16, 3.0 V operation, 90 ns access; lacks 1.8 V compatibility and SuperFlash fixed-timing guarantee.	Requires separate 3.0 V rail; not suitable for 1.8 V-only designs; endurance rated at 100k cycles but timing increases with wear.	Select only if legacy 3.0 V system architecture precludes voltage scaling; verify timing derating curves for long-life deployments.
S29GL032N90TFI010	32 Mbit x16, 3.0 V, 90 ns; includes ECC and sector protection locks not present in SST39WF400A-90-4I-M1QE-T.	Higher density suits complex firmware; ECC adds overhead for simple storage; incompatible voltage domain.	Choose when >4 Mbit capacity is mandatory and 3.0 V supply is available; avoid for direct 1.8 V drop-in replacement.

Compared with MX29LV400CBTI-90G and S29GL032N90TFI010, the SST39WF400A-90-4I-M1QE-T uniquely delivers 1.8 V native operation with invariant 28 µs program time across its full endurance life-critical for deterministic update scheduling in resource-constrained industrial controllers.

Availability

SST39WF400A-90-4I-M1QE-T is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device configuration memory, telecom bootloader hosting, automotive OTA update caching, and embedded controller boot code retention requiring stable component supply and long-term obsolescence management.

Supply support for SST39WF400A-90-4I-M1QE-T 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

Silicon Storage Technology (SST), now part of Microchip Technology, specialized in high-reliability NOR flash memory using proprietary SuperFlash technology for industrial and automotive applications.

The SST39WF400A product line was designed specifically for 1.8 V embedded systems needing robust, low-power, long-retention nonvolatile storage with JEDEC-compliant command sets and predictable timing behavior across full endurance life.

FAQ

What voltage range does the SST39WF400A-90-4I-M1QE-T support for reliable operation?

The SST39WF400A-90-4I-M1QE-T operates within a strict 1.65–1.95 V supply range. The "-90" speed grade is qualified only for 1.70–1.95 V; operation below 1.70 V may violate the 90 ns read access specification. This single-supply design eliminates need for external VPP generation, simplifying power architecture in 1.8 V systems where the SST39WF400A-90-4I-M1QE-T is commonly deployed.

How does the SST39WF400A-90-4I-M1QE-T handle write completion detection?

The SST39WF400A-90-4I-M1QE-T provides two hardware-supported methods: Data# Polling (DQ7 toggles complement/data state until operation completes) and Toggle Bit (DQ6 alternates logic states during internal execution). Both are valid after the rising edge of the fourth WE#/CE# pulse for programming and sixth pulse for erase operations-enabling efficient polling without blocking host processor execution during SST39WF400A-90-4I-M1QE-T internal cycles.

Is the SST39WF400A-90-4I-M1QE-T pin-compatible with other 48-ball BGA flash devices?

No-the SST39WF400A-90-4I-M1QE-T uses a proprietary 48-ball TFBGA pinout defined in Figure 2 of its datasheet, differing from standard JEDEC x16 flash footprints. While it shares ball count and pitch with some competitors, signal assignments (e.g., A17 as AMS, dual NC placements) and internal decode logic for sector/block addressing are unique to SST's SuperFlash architecture and not interchangeable with MX29LV400CBTI-90G or S29GL032N90TFI010 without PCB redesign.

What erase granularity options does the SST39WF400A-90-4I-M1QE-T support?

The SST39WF400A-90-4I-M1QE-T supports three erase modes: Word-Program (individual 16-bit locations, after sector erase), Sector-Erase (uniform 2 KWord = 4 KByte sectors), and Block-Erase (uniform 32 KWord = 64 KByte blocks). Chip-Erase is also available. This hierarchy enables precise firmware patching-e.g., updating a single driver module (sector) without affecting bootloader (block) or calibration data (separate sector)-maximizing field update efficiency in the SST39WF400A-90-4I-M1QE-T.

Does the SST39WF400A-90-4I-M1QE-T include hardware write protection features?

Yes-the SST39WF400A-90-4I-M1QE-T integrates multiple hardware safeguards: noise/glitch protection (ignores WE#/CE# pulses <5 ns), VDD power-up/down detection (inhibits writes below 1.0 V), and Write Inhibit Mode (forces high-Z outputs when OE# low, CE# high, or WE# high). These operate independently of software commands and provide fail-safe protection during power transitions-critical for maintaining data integrity in the SST39WF400A-90-4I-M1QE-T during brown-out conditions.

SST39WF400A-90-4I-M1QE-T Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: SST39 MPF™

Package/Case:: 48-WFBGA

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Programmable:: Not Verified

Memory Type:: Non-Volatile

Memory Format:: FLASH

Technology:: FLASH

Memory Size:: 4Mbit

Memory Organization:: 256K x 16

Memory Interface:: Parallel

Clock Frequency:: -

Write Cycle Time - Word, Page:: 40µs

Access Time:: 90 ns

Voltage - Supply:: 1.65V ~ 1.95V

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 48-WFBGA (6x4)

SST39WF400A-90-4I-M1QE-T FAQ

1.How can I place an order for SST39WF400A-90-4I-M1QE-T through Aetrix?

Please submit a Request for Quotation (RFQ) for SST39WF400A-90-4I-M1QE-T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for SST39WF400A-90-4I-M1QE-T reliable?

The price and inventory of SST39WF400A-90-4I-M1QE-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SST39WF400A-90-4I-M1QE-T is usually 5 days.

3.What payment methods are accepted for SST39WF400A-90-4I-M1QE-T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST39WF400A-90-4I-M1QE-T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SST39WF400A-90-4I-M1QE-T?

SST39WF400A-90-4I-M1QE-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SST39WF400A-90-4I-M1QE-T order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for SST39WF400A-90-4I-M1QE-T?

For technical support, including SST39WF400A-90-4I-M1QE-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST39WF400A-90-4I-M1QE-T requirements.

6.How does Aetrix verify that SST39WF400A-90-4I-M1QE-T is sourced from the original manufacturer or authorized distributors?

All SST39WF400A-90-4I-M1QE-T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SST39WF400A-90-4I-M1QE-T meets industry standards.

7.What is the process for return or replacement of SST39WF400A-90-4I-M1QE-T?

All SST39WF400A-90-4I-M1QE-T units undergo pre-shipment inspection (PSI). If there is an issue with SST39WF400A-90-4I-M1QE-T, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The SST39WF400A-90-4I-M1QE-T part is unused and in its original packaging.

Return procedure for SST39WF400A-90-4I-M1QE-T:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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