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Microchip Technology SST39VF401C-70-4I-EKE-T
- Part No.:
- SST39VF401C-70-4I-EKE-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 48-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
SST39VF401C-70-4I-EKE-T.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 48TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,818
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Product details
Overview
SST39VF401C-70-4I-EKE-T from Microchip is a 4 Mbit (256K × 16) CMOS Multi-Purpose Flash Plus memory IC with SuperFlash® technology, designed for embedded firmware and configuration storage in industrial controllers and legacy system upgrades. It operates at 2.7–3.6 V, delivers 70 ns read access time, supports hardware block protection on the bottom 8 KWord boot sector (00000H–01FFFH), and features erase-suspend/resume capability for real-time interruptible flash management.
For engineers reviewing the SST39VF401C-70-4I-EKE-T datasheet, SST39VF401C-70-4I-EKE-T pinout, SST39VF401C-70-4I-EKE-T application, or SST39VF401C-70-4I-EKE-T equivalent, this page provides verified technical context, JEDEC-compliant x16 interface behavior, boot-block protection mapping, SuperFlash endurance/reliability metrics, and validated alternative flash parts for migration or second-source planning.
Technical Context
This device implements a split-gate SuperFlash cell architecture with thick-oxide tunneling injector, enabling fixed 7 µs word-program and 18 ms sector/block-erase times independent of cycle count-eliminating software de-rating over lifetime. Its command-set follows JEDEC-standard x16 flash protocols, including six-byte erase sequences and three-byte program initiation.
Hardware data protection includes WP#-controlled bottom-boot-block lock (00000H–01FFFH), RST#-driven hard reset to read mode, and noise/glitch immunity (<5 ns WE#/CE# pulse rejection). Status reporting uses dual methods: DQ7 Data# Polling and DQ6/DQ2 Toggle Bits, plus open-drain RY/BY# with external pull-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (256K × 16 organization), directly replaces 27C040/29F040 in x16 bus systems |
| Read Access Time | 70 ns maximum - enables direct connection to 14 MHz ISA or 8051-based controllers without wait states |
| Supply Voltage | 2.7–3.6 V - supports single-supply operation in battery-backed or low-voltage industrial rails |
| Endurance | 100,000 program/erase cycles - sufficient for field firmware updates over 10+ years in deployed equipment |
| Data Retention | Greater than 100 years - qualified for long-lifecycle infrastructure and medical devices |
| Block Protection | Bottom 8 KWord (00000H–01FFFH) hardware-locked when WP# = low - secures bootloader code against corruption |
| Security ID | 128-bit factory-programmed + 128-word user-programmable space - enables device authentication and traceability |
Pinout & Package
Package: 48-lead TSOP (12 mm × 20 mm), RoHS-compliant, standard JEDEC x16 flash footprint compatible with SST39VF402C/SST39LF401C footprints.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus; AMS = A17 selects top/bottom boot blocks during erase commands |
| DQ0–DQ15 | Data I/O | 16-bit bidirectional bus; latched internally during write; tri-stated when CE# or OE# high |
| CE# | Chip Enable | Active-low chip select; must be low to enable read/write; controls address/data latch timing |
| OE# | Output Enable | Active-low output gate; used with CE# to control read data flow; no effect on write operations |
| WE# | Write Enable | Active-low write strobe; falling edge latches address; rising edge latches data/command byte |
| WP# | Write Protect | Active-low hardware lock for bottom 8 KWord boot sector; floating = unprotected (internal pull-up) |
| RST# | Reset | Active-low hard reset; terminates ongoing erase/program and forces return to read mode |
| RY/BY# | Ready/Busy# | Open-drain status indicator; pulled low during internal write; requires 10–100 kΩ external pull-up |
| VDD | Power Supply | 2.7–3.6 V supply; powers all logic and SuperFlash programming circuitry |
| VSS | Ground | Reference ground for all I/O and core functions; two dedicated pins for noise reduction |
Key Features
| Feature | Design Value |
|---|---|
| Erase-Suspend/Resume | Allows real-time read access to non-suspended sectors during active erase - critical for deterministic response in PLCs and motor drives |
| Auto Low Power Mode | Reduces active read current from 5 mA to 3 µA after valid access - cuts standby power in always-on instrumentation |
| Uniform Sector Architecture | 2 KWord sectors (128 total) enable fine-grained firmware partitioning and partial update without full chip erase |
| Flexible Block Erase | One 8-, two 4-, one 16-, and seven 32-KWord blocks - optimizes erase time for bootloader (small block) vs. application (large block) |
| SuperFlash Reliability | Fixed 7 µs program / 18 ms erase times across full lifecycle - eliminates runtime degradation compensation in host firmware |
Applications
| Industrial PLC Firmware Storage | Legacy PC BIOS Replacement |
|---|---|
Use Scenario: Storing ladder logic and I/O configuration in DIN-rail mounted programmable logic controllers operating in wide-temperature environments. IC Role / Device Role / Timing Role: Nonvolatile x16 parallel flash memory serving as primary firmware image store with hardware boot-block protection. Use Value: Bottom 8 KWord hardware lock prevents accidental overwrite of bootloader during field firmware updates via RS-485. |
Use Scenario: Replacing obsolete 27C040 EPROMs in legacy AT/ATX motherboard BIOS sockets requiring 5 V tolerant but 3.3 V–compatible operation. IC Role / Device Role / Timing Role: Drop-in JEDEC x16 flash replacement with identical pinout and 70 ns access - no PCB redesign required. Use Value: Eliminates UV eraser dependency and enables in-system firmware updates via ISA bus without socket removal. |
| Medical Device Configuration Memory | Telecom Line Card Boot Image |
Use Scenario: Storing calibration tables and safety-critical operational parameters in FDA-class II diagnostic equipment with 10+ year service life. IC Role / Device Role / Timing Role: High-reliability configuration store using >100-year data retention and 100,000-cycle endurance for recalibration events. Use Value: Security ID feature enables unique device binding and audit trail for regulatory compliance (IEC 62304). |
Use Scenario: Holding boot firmware and FPGA configuration bitstreams on carrier-grade DSLAM line cards requiring hot-swap resilience. IC Role / Device Role / Timing Role: Dual-role flash: boot code execution via XIP and FPGA config loading via parallel interface during power-up. Use Value: Erase-suspend capability allows real-time diagnostics to read status registers while background firmware update proceeds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar parallel NOR flash applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF402C-70-4I-EKE-T | Top-boot architecture (3E000H–3FFFFH protected); otherwise identical voltage, timing, and command set | Used where bootloader resides in top sector - incompatible pin-for-pin replacement due to different protected address range | Select only if design requires top-boot protection; verify WP# behavior and address map alignment |
| MX29LV400CTTI-70G | Same density/timing, but uses different command set (AMD-style); no RY/BY# pin; requires software driver modification | Lower cost option for new designs without legacy SST39VF compatibility requirements | Choose for cost-sensitive volume production where firmware can be adapted; not drop-in replaceable |
Compared with SST39VF401C-70-4I-EKE-T, SST39VF402C offers inverted boot-block location for top-sector security, while MX29LV400CTTI demands full command-set revalidation - making the former a layout-compatible alternative and the latter a software-dependent option.
Availability
SST39VF401C-70-4I-EKE-T is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy PC BIOS replacement, medical device configuration memory, and telecom line card boot image applications requiring stable component supply across extended product lifecycles.
Supply support for SST39VF401C-70-4I-EKE-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
Microchip Technology acquired Silicon Storage Technology (SST) in 2016 and now manufactures and supports the SST39VF family as part of its broad parallel NOR flash portfolio.
The SST39VF401C product line was developed to deliver high-reliability, low-voltage parallel flash for industrial and automotive applications where long-term data retention and deterministic erase/program timing are mandatory.
FAQ
What is the boot-block protection scheme of the SST39VF401C-70-4I-EKE-T?
The SST39VF401C-70-4I-EKE-T implements bottom-boot hardware block protection: when WP# is driven low, the lowest 8 KWord (00000H–01FFFH) is locked against program and erase operations. This region is intended for bootloader code. If WP# is left floating, an internal pull-up disables protection, allowing full array access. SST39VF401C-70-4I-EKE-T does not support top-boot protection - that function belongs to SST39VF402C.
Does the SST39VF401C-70-4I-EKE-T require an external VPP voltage for programming?
No, the SST39VF401C-70-4I-EKE-T generates all internal programming voltages (VPP) on-chip. It operates from a single 2.7–3.6 V supply for both read and write operations. No external high-voltage source or VPP pin is present - simplifying power design and eliminating associated charge-pump components. This is confirmed in Table 9 of the datasheet, where VPP min/max fields are listed as 0000H.
How is end-of-write detection implemented in the SST39VF401C-70-4I-EKE-T?
The SST39VF401C-70-4I-EKE-T provides three concurrent end-of-write detection methods: DQ7 Data# Polling (complement-to-data toggle), DQ6/DQ2 Toggle Bits (alternating 1/0 during operation), and open-drain RY/BY# (low = busy, high = ready). All are valid after specific WE# edges per operation type - e.g., DQ7 polling becomes active after the fourth WE# rising edge in word-program mode. SST39VF401C-70-4I-EKE-T does not require external polling hardware.
Can the SST39VF401C-70-4I-EKE-T be used in a 5 V system?
No, the SST39VF401C-70-4I-EKE-T is strictly a 2.7–3.6 V device. Its absolute maximum ratings do not include 5 V tolerance on any pin, and applying 5 V to VDD, I/O, or control lines will cause permanent damage. For 5 V systems, a level-shifting interface or selection of a 5 V–tolerant flash (e.g., older AMD Am29LV400B) is required. SST39VF401C-70-4I-EKE-T is designed for modern low-voltage embedded platforms.
What package type is used in the SST39VF401C-70-4I-EKE-T suffix?
The "-EKE-T" suffix denotes a 48-lead TSOP (Thin Small Outline Package) with 12 mm × 20 mm body size and standard JEDEC MO-142AC footprint. This is the most common package for SST39VF401C-70-4I-EKE-T and matches pin assignments shown in Figure 2 of the datasheet. It is not the TFBGA or WFBGA variant - those use different suffixes (e.g., "-B3K" or "-MAQ").
SST39VF401C-70-4I-EKE-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- SST39 MPF™
- Package/Case:
- 48-TFSOP (0.724", 18.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 10µs
- Access Time:
- 70 ns
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-TSOP
SST39VF401C-70-4I-EKE-T FAQ
1.How can I place an order for SST39VF401C-70-4I-EKE-T through Aetrix?
Please submit a Request for Quotation (RFQ) for SST39VF401C-70-4I-EKE-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 SST39VF401C-70-4I-EKE-T reliable?
The price and inventory of SST39VF401C-70-4I-EKE-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SST39VF401C-70-4I-EKE-T is usually 5 days.
3.What payment methods are accepted for SST39VF401C-70-4I-EKE-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST39VF401C-70-4I-EKE-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST39VF401C-70-4I-EKE-T?
SST39VF401C-70-4I-EKE-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST39VF401C-70-4I-EKE-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 SST39VF401C-70-4I-EKE-T?
For technical support, including SST39VF401C-70-4I-EKE-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST39VF401C-70-4I-EKE-T requirements.
6.How does Aetrix verify that SST39VF401C-70-4I-EKE-T is sourced from the original manufacturer or authorized distributors?
All SST39VF401C-70-4I-EKE-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 SST39VF401C-70-4I-EKE-T meets industry standards.
7.What is the process for return or replacement of SST39VF401C-70-4I-EKE-T?
All SST39VF401C-70-4I-EKE-T units undergo pre-shipment inspection (PSI). If there is an issue with SST39VF401C-70-4I-EKE-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 SST39VF401C-70-4I-EKE-T part is unused and in its original packaging.
Return procedure for SST39VF401C-70-4I-EKE-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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