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Microchip Technology SST39WF400A-90-4I-B3KE
- Part No.:
- SST39WF400A-90-4I-B3KE
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 48-TFBGA
- Datasheet:
-
SST39WF400A-90-4I-B3KE.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 48TFBGA
- Quantity:
- Payment:
- Shipping:
Inventory:4,347
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Product details
Overview
SST39WF400A-90-4I-B3KE from Silicon Storage Technology is a 4 Mbit (256K × 16) single-supply Multi-Purpose Flash memory IC with 90 ns read access time, 1.65–1.95 V operation, and JEDEC-standard x16 asynchronous interface. It delivers high endurance (100,000 cycles), >100-year data retention, and supports sector/block/chip erase via software command sequences - used in embedded firmware storage, industrial controller configuration, and boot code retention.
For engineers reviewing the SST39WF400A-90-4I-B3KE datasheet, SST39WF400A-90-4I-B3KE pinout, SST39WF400A-90-4I-B3KE application, or SST39WF400A-90-4I-B3KE equivalent, key selection criteria include its 1.8 V core compatibility, uniform 2 KWord sector architecture, toggle-bit/data# polling write status detection, and 48-ball TFBGA (6 mm × 8 mm) packaging for space-constrained PCBs.
Technical Context
The SST39WF400A-90-4I-B3KE implements SuperFlash split-gate technology with thick-oxide tunneling injector, enabling fixed erase/program timing independent of cycle count. Its command-set architecture follows JEDEC-standard flash pinouts and uses three- or six-byte software sequences for word-program, sector-erase, block-erase, and chip-erase operations.
It features dual write-completion detection (DQ6 toggle bit and DQ7 data# polling), hardware write inhibit (OE#/CE#/WE# control), and integrated software data protection (SDP) permanently enabled at shipment. The device operates across -40°C to +85°C (industrial grade) and supports CFI query mode for automated system identification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (256K × 16 organization) - provides 512 KB of nonvolatile storage for firmware images or configuration tables. |
| Read Access Time | 90 ns - enables direct execution from flash (XIP) in low-latency microcontroller boot paths. |
| Supply Voltage | 1.65–1.95 V - compatible with 1.8 V system rails; eliminates need for level shifters in modern low-voltage designs. |
| Endurance | 100,000 program/erase cycles (typical) - supports frequent field updates in programmable logic controllers and IoT edge devices. |
| Data Retention | >100 years - ensures long-term reliability in unattended infrastructure equipment without refresh cycles. |
| Erase Granularity | Uniform 2 KWord sectors (4 KB) and 32 KWord blocks (64 KB) - allows fine-grained firmware patching and modular configuration management. |
| Write Timing | 28 µs word-program (typical); 36 ms sector/block-erase (typical); 140 ms chip-erase (typical) - predictable timing simplifies real-time OS integration. |
Pinout & Package
Package: 48-ball TFBGA (6 mm × 8 mm), RoHS-compliant, industrial temperature grade (-40°C to +85°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | A0–A16 select 256K words; A17 (AMS) is most-significant address used for sector/block addressing during erase commands. |
| DQ0–DQ15 | Data I/O Bus | x16 bidirectional bus; tri-stated when CE# or OE# is high; latched on rising edge of WE#/CE# during writes. |
| CE# | Chip Enable | Active-low device select; must be low for read/write operations; high-Z output state when asserted high. |
| OE# | Output Enable | Active-low output gate; controls data bus drive; required low with CE# low for valid read data. |
| WE# | Write Enable | Active-low write strobe; controls latching of addresses and data; initiates internal program/erase after sixth pulse in command sequences. |
| VDD | Power Supply | 1.65–1.95 V supply; powers core logic and SuperFlash array; internal VPP generation eliminates external charge pump. |
| VSS | Ground | Reference ground for all I/O and core circuitry; two dedicated VSS balls ensure stable return path. |
| NC | No Connection | Unbonded pins (e.g., A11, A12, A13 in TFBGA layout); must remain unconnected per design. |
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 lifecycle - no software de-rating required. |
| Software Data Protection (SDP) | JEDEC-compliant three-byte (program) and six-byte (erase) command sequences prevent accidental writes during power transitions. |
| Write Status Detection | DQ6 toggle bit and DQ7 data# polling provide deterministic, software-driven completion signaling - eliminates need for fixed delay loops. |
| CFI Query Support | Standard Common Flash Interface enables automatic detection of density, timing, and command set by host bootloader or flash programmer. |
| Hardware Write Inhibit | Glitch protection (<5 ns pulses ignored), VDD power-up/down detection (<1.0 V inhibits writes), and OE#/CE#/WE# gating prevent spurious programming. |
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 environments with ambient temperatures up to +85°C. IC Role / Device Role / Timing Role: Nonvolatile boot memory providing XIP-capable 90 ns read access and sector-erase for incremental firmware patches. Use Value: 100,000-cycle endurance and >100-year retention ensure reliable operation over 15+ year equipment lifecycles without field replacement. |
Use Scenario: Holding calibrated sensor parameters, user preferences, and regulatory audit logs in portable diagnostic instruments requiring FDA-compliant data integrity. IC Role / Device Role / Timing Role: Secure configuration store with SDP-enabled erase/write commands and CFI-based identity verification during device initialization. Use Value: Permanent software data protection and deterministic toggle-bit status detection prevent corruption during battery-backed power transitions. |
| Automotive Infotainment Boot ROM | Network Router Bootloader Storage |
|
Use Scenario: Hosting primary bootloader and secure boot keys in automotive head units operating across extended temperature ranges (-40°C to +85°C). IC Role / Device Role / Timing Role: Industrial-grade flash memory interfacing directly with ARM Cortex-A MCU via x16 asynchronous bus; supports fast 90 ns reads for boot latency optimization. Use Value: Single 1.8 V supply eliminates level-shifting complexity; uniform 4 KB sectors enable signed firmware image partitioning with cryptographic signature validation. |
Use Scenario: Storing U-Boot, kernel images, and runtime configuration in carrier-grade Ethernet routers requiring remote firmware upgrades over TLS-secured channels. IC Role / Device Role / Timing Role: High-reliability flash with 64 KB block-erase capability for atomic firmware update rollback and dual-bank A/B partitioning schemes. Use Value: Predictable 36 ms block-erase time enables deterministic upgrade windows; CFI support allows auto-negotiation of timing parameters across production batches. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF400A-90-4I-B3KE | 3.3 V supply (2.7–3.6 V), same 4 Mbit x16 density and 90 ns timing - incompatible voltage domain; requires level shifting in 1.8 V systems. | Targeted at legacy 3.3 V industrial controllers; not suitable for new 1.8 V designs without interface adaptation. | Select only if existing 3.3 V power rail and board layout preclude redesign; verify OE#/CE# timing margins at 3.3 V. |
| MX29LV400CBTI-90G | 3.3 V supply, 4 Mbit x16, 90 ns, but uses different command set (no CFI support) and lower endurance (100,000 cycles same, but retention rated at 20 years). | Used in cost-sensitive consumer electronics; lacks CFI query and deterministic toggle-bit behavior per JEDEC spec. | Consider for non-critical applications where CFI auto-detection and >100-year retention are not required; validate SDP implementation against SST's sequence. |
Compared with SST39VF400A-90-4I-B3KE and MX29LV400CBTI-90G, the SST39WF400A-90-4I-B3KE uniquely combines 1.8 V operation, JEDEC CFI compliance, and guaranteed >100-year data retention - making it the only drop-in solution for next-generation low-power embedded systems requiring long-term firmware integrity.
Availability
SST39WF400A-90-4I-B3KE is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device configuration memory, and automotive infotainment boot ROM requiring stable component supply across extended temperature and long-lifecycle programs.
Supply support for SST39WF400A-90-4I-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
Silicon Storage Technology (SST), now part of Microchip Technology, specialized in high-reliability NOR flash memory using proprietary SuperFlash technology for embedded systems.
The SST39WF400A product line was engineered for low-voltage, high-endurance firmware and configuration storage in industrial, medical, and automotive applications demanding >100-year data retention and deterministic erase timing.
FAQ
What is the operating voltage range for the SST39WF400A-90-4I-B3KE?
The SST39WF400A-90-4I-B3KE operates from 1.65 V to 1.95 V, optimized for 1.8 V nominal systems. It does not support 3.3 V operation - using higher voltages risks permanent damage. This narrow range enables direct connection to modern low-power SoC I/O rails without level shifters, and internal VPP generation eliminates external charge pumps.
Does the SST39WF400A-90-4I-B3KE support CFI (Common Flash Interface)?
Yes, the SST39WF400A-90-4I-B3KE fully supports CFI Query mode via the standard three-byte entry sequence (5555H/AAH → 2AAAH/55H → 5555H/98H). Once entered, CFI data at addresses 10H–34H provides automated identification of density, timing parameters, erase block structure, and command set - enabling plug-and-play integration with generic flash programmers and bootloaders.
How is write completion detected on the SST39WF400A-90-4I-B3KE?
The SST39WF400A-90-4I-B3KE provides two hardware-supported methods: DQ6 toggle bit (alternating 0/1 during operation, stops when complete) and DQ7 data# polling (complement of true data during write, returns true data upon completion). Both are valid after the fourth (program) or sixth (erase) WE# pulse and require no external components - enabling robust, timing-independent firmware update routines.
What package type is used for the SST39WF400A-90-4I-B3KE?
The SST39WF400A-90-4I-B3KE is supplied in a 48-ball TFBGA package measuring 6 mm × 8 mm, with ball pitch of 0.8 mm. This industrial-grade package supports reflow soldering per J-STD-020 and is rated for operation from -40°C to +85°C. Pin assignments match JEDEC-standard x16 flash layouts, ensuring compatibility with existing footprint libraries.
Is software data protection enabled by default on the SST39WF400A-90-4I-B3KE?
Yes, Software Data Protection (SDP) is permanently enabled at shipment for the SST39WF400A-90-4I-B3KE. All program and erase operations require validated command sequences (three-byte for word-program, six-byte for erase). This prevents accidental writes during power-up/down transients and eliminates the need for external hardware write-protection signals in safety-critical applications.
SST39WF400A-90-4I-B3KE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- SST39 MPF™
- Package/Case:
- 48-TFBGA
- Packaging:
- Tray
- 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-TFBGA
SST39WF400A-90-4I-B3KE FAQ
1.How can I place an order for SST39WF400A-90-4I-B3KE through Aetrix?
Please submit a Request for Quotation (RFQ) for SST39WF400A-90-4I-B3KE 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-B3KE reliable?
The price and inventory of SST39WF400A-90-4I-B3KE 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-B3KE is usually 5 days.
3.What payment methods are accepted for SST39WF400A-90-4I-B3KE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST39WF400A-90-4I-B3KE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST39WF400A-90-4I-B3KE?
SST39WF400A-90-4I-B3KE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST39WF400A-90-4I-B3KE 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-B3KE?
For technical support, including SST39WF400A-90-4I-B3KE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST39WF400A-90-4I-B3KE requirements.
6.How does Aetrix verify that SST39WF400A-90-4I-B3KE is sourced from the original manufacturer or authorized distributors?
All SST39WF400A-90-4I-B3KE 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-B3KE meets industry standards.
7.What is the process for return or replacement of SST39WF400A-90-4I-B3KE?
All SST39WF400A-90-4I-B3KE units undergo pre-shipment inspection (PSI). If there is an issue with SST39WF400A-90-4I-B3KE, 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-B3KE part is unused and in its original packaging.
Return procedure for SST39WF400A-90-4I-B3KE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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