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Microchip Technology SST39VF040-70-4I-WHE-T
- Part No.:
- SST39VF040-70-4I-WHE-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
SST39VF040-70-4I-WHE-T.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,570
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Product details
Overview
SST39VF040-70-4I-WHE-T from Microchip Technology (formerly Silicon Storage Technology) is a 4 Mbit (512K × 8) CMOS Multi-Purpose Flash memory IC designed for nonvolatile program, configuration, and data storage in embedded systems. It operates from 2.7–3.6 V, features 70 ns read access time, 100,000 write/erase cycles endurance, and >100 years data retention - enabling reliable firmware updates in industrial controllers and legacy BIOS modules.
For engineers reviewing the SST39VF040-70-4I-WHE-T datasheet, SST39VF040-70-4I-WHE-T pinout, SST39VF040-70-4I-WHE-T application, or SST39VF040-70-4I-WHE-T equivalent, key selection considerations include its 32-pin TSOP-I (8 mm × 14 mm) package, JEDEC-standard x8 parallel interface, sector-erase architecture with uniform 4 KB blocks, and dual software/hardware data protection for robust field reprogramming.
Technical Context
This device implements SST's proprietary SuperFlash technology with split-gate cell design and thick-oxide tunneling injector, delivering fixed erase/program timing independent of cycle count - eliminating system-level de-rating over lifetime. It uses standard microprocessor bus timing with latched address/data and supports CE#- or WE#-controlled operations.
Write status detection is implemented via DQ7 Data# Polling and DQ6 Toggle Bit, both valid after the fourth (byte-program) or sixth (sector/chip-erase) WE#/CE# pulse. The device conforms to JEDEC-standard pinouts and command sets for x8 flash memories, ensuring interoperability with existing 8-bit memory controllers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512K × 8), supporting up to 512 KB of firmware or configuration data in single-byte-addressable space. |
| Read Access Time | 70 ns maximum - enables direct execution from flash (XIP) in 14 MHz microcontroller systems without wait states. |
| Supply Voltage | 2.7–3.6 V - compatible with 3.3 V logic rails and tolerant of brown-out conditions down to 2.7 V during programming. |
| Endurance | 100,000 program/erase cycles - sufficient for >10 years of daily firmware updates in industrial gateways. |
| Data Retention | Greater than 100 years at 25°C - ensures long-term reliability in unattended infrastructure equipment. |
| Sector Size | Uniform 4 KB sectors - allows granular firmware patching without erasing full device, minimizing update downtime. |
| Active Current | 5 mA typical at 14 MHz - reduces power budget impact in always-on edge nodes. |
Pinout & Package
Package: 32-lead TSOP-I (8 mm × 14 mm), RoHS-compliant, surface-mount.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | A0–A15 used for byte addressing; A16–A18 are MSBs (AMS) - A18 active for SST39VF040 to select full 512K address space. |
| DQ0–DQ7 | Data I/O | Bidirectional 8-bit data bus; tri-stated when CE# or OE# high; DQ6 = Toggle Bit, DQ7 = Data# Polling indicator. |
| CE# | Chip Enable | Active-low chip select - must be low to enable read/write; high-Z output state when asserted high. |
| OE# | Output Enable | Active-low output gate - controls data bus drive during read; no effect on write operations. |
| WE# | Write Enable | Active-low write control - initiates byte-program, sector-erase, or chip-erase upon valid command sequence. |
| VDD | Power Supply | 2.7–3.6 V supply - internal charge pump generates VPP for programming; no external high-voltage source required. |
| VSS | Ground | Reference return path for all signals and power; decoupling capacitor placement critical near this pin. |
| NC | No Connection | Pins 16 and 24 (TSOP) are unconnected - must remain floating per datasheet; not tied to VDD/VSS. |
Key Features
| Feature | Design Value |
|---|---|
| SuperFlash® Technology | Split-gate cell with thick-oxide tunneling injector enables fixed 18 ms sector-erase and 70 ms chip-erase times across full lifecycle - eliminates software timing margin expansion. |
| Software Data Protection | JEDEC-standard 3-byte (program) and 6-byte (erase) command sequences prevent accidental writes during power transitions or noise events. |
| Hardware Write Inhibit | Automatic lockout when VDD < 1.5 V, WE#/CE#/OE# glitch rejection (<5 ns), and tri-state outputs on CE#/OE# high ensure safe power-up/down behavior. |
| End-of-Write Detection | DQ6 Toggle Bit and DQ7 Data# Polling provide deterministic, bus-compatible status reporting - no dedicated status register or polling overhead required. |
| Low Standby Current | 1 µA typical - enables battery-backed operation in maintenance-free IoT sensors with multi-year shelf life. |
Applications
| Industrial PLC Firmware Storage | Legacy PC BIOS/UEFI Module |
|---|---|
Use Scenario: Storing and updating ladder logic firmware in programmable logic controllers deployed in factory automation environments with wide temperature swings (-40°C to +85°C). IC Role / Device Role / Timing Role: Nonvolatile code storage with in-system reprogrammability; executes directly from flash via microcontroller's external memory interface. Use Value: Enables remote firmware patches without hardware replacement; 100,000-cycle endurance supports >20 years of scheduled updates under industrial duty cycles. |
Use Scenario: Holding BIOS/UEFI initialization code and hardware configuration tables in desktop motherboards and server baseboard management controllers (BMCs). IC Role / Device Role / Timing Role: Boot-time read-only memory mapped at reset vector; supports fast 70 ns reads for minimal POST delay. Use Value: JEDEC-compliant pinout ensures drop-in compatibility with legacy socket designs; RoHS compliance meets global regulatory requirements. |
| Network Router Configuration Memory | Medical Device Calibration Data Storage |
Use Scenario: Persisting routing tables, ACL rules, and secure boot keys in enterprise-grade Ethernet switches operating 24/7 in climate-controlled data centers. IC Role / Device Role / Timing Role: Secure, tamper-resistant configuration store accessed via SPI-to-parallel bridge or native 8-bit bus. Use Value: Hardware + software data protection prevents unauthorized modification; >100-year data retention guarantees integrity across product lifecycle. |
Use Scenario: Storing sensor calibration coefficients, safety-critical fault logs, and regulatory audit trails in portable diagnostic equipment requiring FDA 21 CFR Part 11 compliance. IC Role / Device Role / Timing Role: Write-once or infrequently updated nonvolatile memory with deterministic erase timing for traceable data lifecycle management. Use Value: Fixed 70 ms chip-erase time enables predictable firmware validation windows; industrial temp grade (-40°C to +85°C) supports clinical environment operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MX29LV400CBTI-70G | 4 Mbit (512K × 8), 70 ns access, 3.0–3.6 V supply; requires 12 V VPP for programming; no built-in charge pump. | Lacks integrated VPP generation - needs external high-voltage circuitry; less suitable for space-constrained or low-power designs. | Select when legacy board already includes VPP generation and cost sensitivity outweighs design simplicity. |
| S29AL032D70TFI020 | 32 Mbit (4M × 8), 70 ns access, 2.7–3.6 V; supports CFI query mode and wider voltage tolerance; larger density. | Higher capacity increases BOM cost and may require PCB layout changes due to different pinout and package (48-pin TSOP). | Choose only if future-proofing for larger firmware images is required and board redesign is acceptable. |
Compared with MX29LV400CBTI-70G and S29AL032D70TFI020, the SST39VF040-70-4I-WHE-T offers integrated VPP generation and JEDEC-standard 32-pin TSOP compatibility - reducing system complexity and enabling true drop-in replacement in existing 4 Mbit parallel flash footprints without voltage rail or layout modifications.
Availability
SST39VF040-70-4I-WHE-T is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy BIOS modules, network router configuration, and medical device calibration data storage requiring stable component supply and long-term lifecycle support.
Supply support for SST39VF040-70-4I-WHE-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 continues to manufacture and support the SuperFlash family of parallel and serial NOR flash devices.
The SST39VF series was engineered specifically for cost-sensitive, high-reliability embedded applications requiring simple 8-bit bus interfacing, low-voltage operation, and robust in-field reprogrammability - targeting industrial control, computing, and communications markets.
FAQ
What is the operating temperature range for the SST39VF040-70-4I-WHE-T?
The SST39VF040-70-4I-WHE-T is rated for industrial temperature operation from -40°C to +85°C, as confirmed in Table 6 of the official datasheet. This makes it suitable for deployment in harsh environments such as factory floors, outdoor telecom cabinets, and medical equipment where ambient thermal stability cannot be guaranteed. The "I" suffix in the part number explicitly denotes industrial grade.
Does the SST39VF040-70-4I-WHE-T require an external VPP voltage for programming?
No, the SST39VF040-70-4I-WHE-T integrates an internal charge pump that generates the necessary high voltage for programming and erasing operations. It operates from a single 2.7–3.6 V supply - eliminating the need for external VPP circuitry, simplifying board design, and improving reliability compared to older flash families requiring 12 V.
How many address lines does the SST39VF040-70-4I-WHE-T use, and what is the role of AMS?
The SST39VF040-70-4I-WHE-T uses A0–A15 for standard byte addressing and A16–A18 as Address Most Significant (AMS) bits. For this 512K × 8 device, AMS = A18 is active to decode the full address space. During sector-erase, AMS–A12 select the target 4 KB sector; during block-erase, AMS–A16 define the block boundary.
What command sequences are required to perform a sector erase on the SST39VF040-70-4I-WHE-T?
A six-byte software command sequence is required: 5555H/AAH → 2AAAH/55H → 5555H/80H → 5555H/AAH → 2AAAH/55H → Sector_Address/30H. The sector address is latched on the falling edge of the sixth WE# pulse, and the internal erase begins thereafter. Valid sector addresses use AMS–A12 lines, aligning to 4 KB boundaries.
Is the SST39VF040-70-4I-WHE-T pin-compatible with the SST39LF040-55-4C-WHE-T?
Yes - both devices share identical 32-pin TSOP-I packaging, JEDEC-standard x8 pinout, and functional signal mapping (A0–A18, DQ0–DQ7, CE#, OE#, WE#, VDD, VSS). The primary differences are supply voltage range (2.7–3.6 V vs. 3.0–3.6 V) and read access time (70 ns vs. 55 ns); no PCB changes are needed for substitution in most designs.
SST39VF040-70-4I-WHE-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- SST39 MPF™
- Package/Case:
- 32-TFSOP (0.488", 12.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 4Mbit
- Memory Organization:
- 512K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 20µs
- 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:
- 32-TSOP
SST39VF040-70-4I-WHE-T FAQ
1.How can I place an order for SST39VF040-70-4I-WHE-T through Aetrix?
Please submit a Request for Quotation (RFQ) for SST39VF040-70-4I-WHE-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 SST39VF040-70-4I-WHE-T reliable?
The price and inventory of SST39VF040-70-4I-WHE-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SST39VF040-70-4I-WHE-T is usually 5 days.
3.What payment methods are accepted for SST39VF040-70-4I-WHE-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST39VF040-70-4I-WHE-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST39VF040-70-4I-WHE-T?
SST39VF040-70-4I-WHE-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST39VF040-70-4I-WHE-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 SST39VF040-70-4I-WHE-T?
For technical support, including SST39VF040-70-4I-WHE-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST39VF040-70-4I-WHE-T requirements.
6.How does Aetrix verify that SST39VF040-70-4I-WHE-T is sourced from the original manufacturer or authorized distributors?
All SST39VF040-70-4I-WHE-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 SST39VF040-70-4I-WHE-T meets industry standards.
7.What is the process for return or replacement of SST39VF040-70-4I-WHE-T?
All SST39VF040-70-4I-WHE-T units undergo pre-shipment inspection (PSI). If there is an issue with SST39VF040-70-4I-WHE-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 SST39VF040-70-4I-WHE-T part is unused and in its original packaging.
Return procedure for SST39VF040-70-4I-WHE-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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