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Microchip Technology SST39LF400A-55-4C-EKE
- Part No.:
- SST39LF400A-55-4C-EKE
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 48-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
SST39LF400A-55-4C-EKE.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 48TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,887
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Product details
Overview
SST39LF400A-55-4C-EKE from Microchip Technology is a 4 Mbit (256K × 16) CMOS Multi-Purpose Flash memory IC using SuperFlash technology, operating at 3.0–3.6 V, with 55 ns read access time, 100,000 program/erase cycles endurance, and >100 years data retention. It serves as nonvolatile program/data storage in embedded microcontroller systems requiring field-upgradable firmware.
For engineers reviewing the SST39LF400A-55-4C-EKE datasheet, SST39LF400A-55-4C-EKE pinout, SST39LF400A-55-4C-EKE application, or SST39LF400A-55-4C-EKE equivalent, key selection considerations include its x16 asynchronous interface, JEDEC-standard command set, sector/block-erase architecture, and TSOP-48 packaging for legacy PCB compatibility.
Technical Context
The SST39LF400A-55-4C-EKE implements a split-gate SuperFlash cell with thick-oxide tunneling injector, enabling fixed 14 µs word-program and 18 ms sector/block-erase times independent of wear. Its control logic supports standard microprocessor bus timing with CE#, OE#, and WE# inputs, latched address/data, and hardware/software write protection.
It conforms to JEDEC-standard x16 flash pinouts and command sets, includes CFI query capability for automatic device identification, and uses DQ6 (Toggle Bit) and DQ7 (Data# Polling) for end-of-write detection-no external VPP required due to internal charge pump generation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (256K × 16), directly maps to 512 KB of x16 addressable space |
| Read Access Time | 55 ns - enables direct execution from flash (XIP) in 14 MHz bus systems |
| Supply Voltage | 3.0–3.6 V - compatible with 3.3 V logic rails without level shifting |
| Endurance | 100,000 program/erase cycles - supports frequent firmware updates in industrial controllers |
| Data Retention | >100 years - ensures long-term reliability in unpowered storage applications |
| Erase Architecture | Uniform 2 KWord sectors (128 total) and 32 KWord blocks (8 total) - enables granular firmware partitioning |
| Write Timing | 14 µs word-program; 18 ms sector/block-erase - deterministic timing simplifies driver development |
Pinout & Package
Package: 48-lead TSOP (12 mm × 20 mm), RoHS-compliant, standard footprint for legacy board reuse.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | A0–A16 used for 256K × 16 addressing; A17 selects upper half of 512 KB space in SST39LF400A |
| DQ0–DQ15 | Data I/O | x16 bidirectional bus; tri-stated when CE# or OE# high; latched internally during writes |
| CE# | Chip Enable | Active-low chip select; enables device for read/write when low; places device in standby when high |
| OE# | Output Enable | Active-low output gate; controls data bus drive only - does not affect internal operations |
| WE# | Write Enable | Active-low write strobe; latches address/data and initiates internal program/erase sequences |
| VDD | Power Supply | 3.0–3.6 V supply; powers core logic and internal VPP generator - no external high-voltage source needed |
| VSS | Ground | Two dedicated ground pins (pins 23 and 48) reduce noise coupling in high-speed reads |
| NC | No Connect | Pins 9, 10, 12–15, 18, 19, 21, 22, 24, 25, 27, 28, 30, 31, 33, 34, 36, 37, 39, 40, 42, 43, 45, 46 - must be left floating |
Key Features
| Feature | Design Value |
|---|---|
| SuperFlash cell architecture | Split-gate + thick-oxide tunneling injector delivers stable erase/program timing across full lifetime |
| JEDEC-standard command set | Enables drop-in replacement in existing x16 flash designs without firmware modification |
| Hardware + software write protection | Prevents accidental writes during power-up/down via VDD monitoring, glitch rejection, and 6-byte SDP sequences |
| CFI Query support | Allows runtime identification of density, timing, and erase geometry - essential for generic flash drivers |
| Uniform 2 KWord sectors | Enables fine-grained firmware update zones (e.g., bootloader, app, config) without erasing entire device |
Applications
| Industrial PLC Firmware Storage | Medical Device Configuration Memory |
|---|---|
Use Scenario: Storing updatable ladder logic and I/O mapping tables in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Nonvolatile x16 parallel flash acting as boot ROM and runtime configuration store, interfaced directly to ARM9 or ColdFire MCU local bus. Use Value: 55 ns access enables zero-wait-state execution; 100,000-cycle endurance supports quarterly firmware patches over 10+ year product life. | Use Scenario: Holding calibrated sensor offsets, user preferences, and regulatory audit logs in portable diagnostic equipment requiring FDA-compliant data integrity. IC Role / Device Role / Timing Role: Secure, long-retention configuration storage with hardware write inhibit during power transitions. Use Value: >100-year data retention meets medical device archival requirements; sector-erase allows safe field updates without corrupting calibration data. |
| Telecom Base Station Bootloader | Automotive Infotainment System Code Storage |
Use Scenario: Hosting primary bootloader and fail-safe recovery image in LTE small-cell base stations operating in extended temperature ranges. IC Role / Device Role / Timing Role: Dual-image flash storage with hardware-based write protection to prevent corruption during remote OTA updates. Use Value: Block-erase capability isolates recovery image from main firmware; 3.0–3.6 V operation matches telecom 3.3 V supply rails. | Use Scenario: Storing navigation map data, UI assets, and firmware in head-unit ECUs where vibration and thermal cycling demand high reliability. IC Role / Device Role / Timing Role: Parallel x16 flash mapped into MCU's external memory interface for fast code fetch and asset streaming. Use Value: Fixed 14 µs program time ensures predictable update duration; TSOP-48 package supports automated optical inspection on automotive-grade PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MX29LV400CTTI-70G | 4 Mbit x16, 70 ns access, 2.7–3.6 V supply, supports CFI but lacks Toggle Bit detection | Requires polling-only status detection; slower read timing limits XIP performance | Select when lower cost is prioritized over 55 ns timing and robust end-of-write signaling |
| EN29LV400AB-70TP | 4 Mbit x16, 70 ns access, 3.0–3.6 V supply, JEDEC-compatible but no CFI support | Lacks runtime geometry identification - requires hardcoded driver parameters | Choose for simple, fixed-function systems where flash geometry is static and known at compile time |
Compared with MX29LV400CTTI-70G and EN29LV400AB-70TP, the SST39LF400A-55-4C-EKE provides faster 55 ns reads, deterministic 14 µs programming, and dual-status detection (DQ6/DQ7) - critical for real-time embedded systems requiring guaranteed update completion signaling.
Availability
SST39LF400A-55-4C-EKE is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device configuration memory, and telecom base station bootloader applications requiring stable component supply and long-lifecycle support.
Supply support for SST39LF400A-55-4C-EKE 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, FPGA, and memory solutions, acquired Silicon Storage Technology (SST) in 2010 to expand its nonvolatile memory portfolio.
The SST39LF400A-55-4C-EKE belongs to the SST39LF/VF family of Multi-Purpose Flash devices, designed specifically for cost-sensitive, high-reliability embedded applications requiring field-upgradable firmware and configuration data without external high-voltage circuitry.
FAQ
What is the exact memory organization of the SST39LF400A-55-4C-EKE?
The SST39LF400A-55-4C-EKE is organized as 256K words × 16 bits (4 Mbit total), providing 512 KB of directly addressable storage space. Address lines A0–A16 cover the full 256K word range, with A17 used for internal sector/block selection during erase commands. This x16 configuration matches standard 16-bit microprocessor buses without data multiplexing.
Does the SST39LF400A-55-4C-EKE require an external VPP voltage for programming?
No, the SST39LF400A-55-4C-EKE does not require an external VPP voltage. It integrates an internal charge pump that generates the necessary high voltage for program and erase operations from the standard 3.0–3.6 V VDD supply. This eliminates external high-voltage circuitry and simplifies system design compared to older flash technologies.
How is write completion detected on the SST39LF400A-55-4C-EKE?
Write completion on the SST39LF400A-55-4C-EKE is detected using two hardware status bits: DQ6 (Toggle Bit) toggles between 0 and 1 during active program/erase, then stops when complete; DQ7 (Data# Polling) returns complemented data during operation and true data upon completion. Both methods are accessible via standard read cycles without halting the host processor.
What package type is used for the SST39LF400A-55-4C-EKE?
The SST39LF400A-55-4C-EKE uses a 48-lead TSOP (Thin Small Outline Package) measuring 12 mm × 20 mm, with standard JEDEC pinout for x16 flash memories. This package is RoHS-compliant, surface-mount compatible, and widely supported in legacy industrial and telecom PCB layouts.
Is the SST39LF400A-55-4C-EKE compatible with JEDEC-standard flash command sets?
Yes, the SST39LF400A-55-4C-EKE fully complies with JEDEC-standard pinouts and command sets for x16 flash memories, including Word-Program, Sector-Erase, Block-Erase, Chip-Erase, and Software ID/CFI Query commands. This ensures interoperability with existing flash drivers and eliminates need for custom command translation logic.
SST39LF400A-55-4C-EKE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- SST39 MPF™
- Package/Case:
- 48-TFSOP (0.724", 18.40mm Width)
- Packaging:
- Tray
- Product Status:
- Active
- 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:
- 20µs
- Access Time:
- 55 ns
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-TSOP
SST39LF400A-55-4C-EKE FAQ
1.How can I place an order for SST39LF400A-55-4C-EKE through Aetrix?
Please submit a Request for Quotation (RFQ) for SST39LF400A-55-4C-EKE 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 SST39LF400A-55-4C-EKE reliable?
The price and inventory of SST39LF400A-55-4C-EKE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SST39LF400A-55-4C-EKE is usually 5 days.
3.What payment methods are accepted for SST39LF400A-55-4C-EKE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST39LF400A-55-4C-EKE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST39LF400A-55-4C-EKE?
SST39LF400A-55-4C-EKE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST39LF400A-55-4C-EKE 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 SST39LF400A-55-4C-EKE?
For technical support, including SST39LF400A-55-4C-EKE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST39LF400A-55-4C-EKE requirements.
6.How does Aetrix verify that SST39LF400A-55-4C-EKE is sourced from the original manufacturer or authorized distributors?
All SST39LF400A-55-4C-EKE 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 SST39LF400A-55-4C-EKE meets industry standards.
7.What is the process for return or replacement of SST39LF400A-55-4C-EKE?
All SST39LF400A-55-4C-EKE units undergo pre-shipment inspection (PSI). If there is an issue with SST39LF400A-55-4C-EKE, 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 SST39LF400A-55-4C-EKE part is unused and in its original packaging.
Return procedure for SST39LF400A-55-4C-EKE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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