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Microchip Technology SST39LF040-45-4C-WHE-T
- Part No.:
- SST39LF040-45-4C-WHE-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
SST39LF040-45-4C-WHE-T.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,044
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Product details
Overview
SST39LF040-45-4C-WHE-T from Microchip Technology is a 4 Mbit (512K × 8) CMOS Multi-Purpose Flash memory IC with 45 ns read access time, single 3.0–3.6 V supply for read/write operations, and uniform 4 KB sector-erase architecture. It implements SuperFlash technology with split-gate cells, delivering 100,000 program/erase cycles and >100 years data retention - deployed in embedded firmware storage for industrial controllers.
For engineers reviewing the SST39LF040-45-4C-WHE-T datasheet, SST39LF040-45-4C-WHE-T pinout, SST39LF040-45-4C-WHE-T application, or SST39LF040-45-4C-WHE-T equivalent, this page provides verified package mapping (32-lead TSOP), JEDEC-compliant x8 parallel interface timing, sector-level erase control logic, and direct replacement guidance against functionally aligned flash devices with matching voltage, density, and command-set compatibility.
Technical Context
This device operates as a JEDEC-standard x8 parallel-interface flash memory, using address latching on CE# or WE# falling edge and data latching on rising edge. Its SuperFlash architecture enables fixed 18 ms sector-erase and 70 ms chip-erase times independent of wear level, eliminating software de-rating over lifetime.
Write status detection relies exclusively on DQ7 (Data# Polling) and DQ6 (Toggle Bit), both valid after the sixth WE# pulse during sector/chip erase. Hardware protection includes noise/glitch immunity (<5 ns pulses ignored), VDD power-up/down detection (<1.5 V inhibits write), and tri-state output control via OE# and CE#.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Density / Organization | 4 Mbit (512K × 8) - supports full firmware image storage for mid-complexity microcontrollers without external memory expansion. |
| Read Access Time | 45 ns - enables direct execution from flash (XIP) at up to ~22 MHz system bus clock in compatible controllers. |
| Supply Voltage | 3.0–3.6 V - compatible with standard 3.3 V logic rails; no separate VPP required due to internal charge pump. |
| Endurance | 100,000 program/erase cycles - sufficient for field firmware updates over 10+ years in industrial equipment. |
| Data Retention | >100 years - ensures long-term reliability in unpowered storage applications such as calibration tables or configuration profiles. |
| Sector Size | Uniform 4 KB sectors - allows granular firmware partitioning (e.g., bootloader, app, config) with independent update capability. |
| Write Methods | Byte-program (14 µs typ.) and sector/chip erase - supports incremental patching and full reflash without block management overhead. |
Pinout & Package
Package: 32-lead TSOP (8 mm × 14 mm), RoHS-compliant, surface-mountable with standard reflow profile (260°C/10 s).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | A0–A17 used for 512K × 8 addressing; A18 selects upper 4 KB sector in SST39LF040 only - enables full 4 Mbit address space decoding. |
| DQ0–DQ7 | Data I/O | Bidirectional x8 data bus; outputs tri-stated when CE# or OE# high - directly interfaces with 8-bit microcontroller data buses without glue logic. |
| CE# | Chip Enable | Active-low global enable; must be low for any operation - used for device selection in multi-chip memory maps. |
| OE# | Output Enable | Active-low output gate; controls DQ bus drive - allows shared data bus with other peripherals via timing-controlled gating. |
| WE# | Write Enable | Active-low write control; initiates byte-program and erase commands - synchronizes command sequences per JEDEC protocol. |
| VDD | Power Supply | 3.0–3.6 V supply; powers internal charge pump for erase/program - eliminates need for external high-voltage generator. |
| VSS | Ground | Reference return path for all signals and internal circuitry - requires low-impedance PCB ground plane for stable erase timing. |
Key Features
| Feature | Design Value |
|---|---|
| SuperFlash® Technology | Split-gate cell + thick-oxide tunneling injector enables fixed 18 ms sector-erase time regardless of accumulated cycles - removes runtime wear-leveling complexity. |
| Software Data Protection | 6-byte command sequence (e.g., 5555H/AAH → 2AAAH/55H → 5555H/80H → 5555H/AAH → 2AAAH/55H → 5555H/10H) prevents accidental chip erase - mandatory before any erase operation. |
| Hardware Write Inhibit | Automatic disable when VDD < 1.5 V or WE#/CE#/OE# in invalid state - eliminates power-rail glitch-induced corruption during brown-out or reset. |
| JEDEC Standard Compliance | Fully compatible with industry-standard x8 flash pinout and command set (including ID read at 5555H/90H) - enables drop-in replacement in legacy designs. |
| Low Standby Current | 1 µA typical - reduces quiescent power in battery-backed systems such as remote sensors or metering endpoints. |
Applications
| Industrial PLC Firmware Storage | Medical Device Configuration Memory |
|---|---|
Use Scenario: Storing boot code, ladder logic, and I/O mapping tables in programmable logic controllers operating in harsh factory environments. IC Role / Device Role / Timing Role: Nonvolatile program memory with XIP-capable 45 ns access, supporting deterministic startup and real-time firmware updates. Use Value: 100,000-cycle endurance ensures 5+ years of daily field updates; 4 KB sector granularity isolates bootloader from application updates. |
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 configuration store with hardware/software write protection preventing unauthorized parameter changes. Use Value: >100-year data retention guarantees calibration persistence across product lifetime; RoHS/REACH compliance meets medical supply chain requirements. |
| Automotive Body Control Module | Networking Equipment Boot Image |
Use Scenario: Hosting firmware for door lock controllers, lighting modules, and HVAC actuators in passenger vehicles with extended temperature requirements. IC Role / Device Role / Timing Role: Automotive-grade firmware memory interfacing with 8-bit MCUs via parallel bus; operates across -40°C to +85°C. Use Value: 3.0–3.6 V operation matches automotive 3.3 V rail tolerances; sector-erase enables OTA update of individual subsystems without full reflash. |
Use Scenario: Storing primary bootloader and fail-safe recovery image in enterprise switches and routers where firmware corruption must be recoverable. IC Role / Device Role / Timing Role: Dual-image flash storage with independent sector locking - one sector holds active firmware, another holds golden image. Use Value: Chip-erase time of 70 ms enables rapid factory recovery; Toggle Bit/DQ7 polling simplifies host-side erase verification without timer dependencies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT49BV040T-70TI | 70 ns read access; 2.7–3.6 V supply; same 4 Mbit density and TSOP32 package. | Slower timing limits XIP use in high-speed controllers; lacks SuperFlash fixed-erase guarantee. | Select when cost sensitivity outweighs timing or endurance requirements; verify timing margins in 20+ MHz bus designs. |
| SST39VF040-70-4C-B3K | 70 ns access; 2.7–3.6 V supply; 48-ball TFBGA package; identical command set and sector architecture. | Lower voltage range suits battery-powered designs; BGA footprint requires different PCB layout and rework capability. | Choose for space-constrained portable systems needing wider VDD tolerance; confirm thermal pad and solder mask design for TFBGA. |
Compared with AT49BV040T-70TI and SST39VF040-70-4C-B3K, the SST39LF040-45-4C-WHE-T delivers faster 45 ns read performance and guaranteed 3.0–3.6 V operation ideal for fixed-rail industrial hosts, while retaining identical JEDEC command compatibility and sector-erase flexibility.
Availability
SST39LF040-45-4C-WHE-T is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device configuration memory, automotive body control modules, and networking equipment boot image applications requiring stable component supply and long-term obsolescence planning.
Supply support for SST39LF040-45-4C-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 is a global semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with leadership in embedded control and secure connectivity.
The SST39LF/VF series was designed specifically for cost-sensitive, high-reliability embedded systems requiring robust nonvolatile storage with simplified firmware update workflows and minimal external circuitry.
FAQ
What is the maximum operating frequency supported by SST39LF040-45-4C-WHE-T?
The SST39LF040-45-4C-WHE-T does not specify a maximum clock frequency, as it is an asynchronous parallel flash device. Its 45 ns read access time supports reliable operation with microcontroller bus cycles down to 45 ns (≈22 MHz), assuming proper setup/hold timing for CE#, OE#, and address stability. System-level timing must account for board trace delays and controller interface limitations.
Does SST39LF040-45-4C-WHE-T require an external VPP voltage for programming?
No, the SST39LF040-45-4C-WHE-T integrates an internal charge pump and operates entirely from a single 3.0–3.6 V supply for both read and write operations. No external VPP generator or high-voltage programming adapter is needed - all erase and program functions are executed using standard 3.3 V logic levels and JEDEC-compliant command sequences.
How is sector erasure initiated on SST39LF040-45-4C-WHE-T?
Sector erasure on SST39LF040-45-4C-WHE-T is initiated via a six-byte software command sequence: 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 internal erase begins immediately thereafter - completion is confirmed via DQ6 toggle bit or DQ7 polling.
Is SST39LF040-45-4C-WHE-T compatible with SST39LF020-45-4C-WHE-T in the same socket?
Yes, SST39LF040-45-4C-WHE-T is pin-compatible and electrically compatible with SST39LF020-45-4C-WHE-T in the same 32-lead TSOP socket. Both share identical pinout, voltage range, timing parameters, and command set. The only functional difference is density (4 Mbit vs. 2 Mbit), so software must validate address range usage to avoid wraparound in 4 Mbit mode.
What happens if an invalid command sequence is sent to SST39LF040-45-4C-WHE-T?
If an invalid command sequence is detected during programming or erasing, the SST39LF040-45-4C-WHE-T automatically aborts the operation and returns to Read mode within TRC (45 ns). This behavior is defined in the Software Data Protection scheme and prevents partial writes or unintended erases - ensuring data integrity even during power glitches or software errors.
SST39LF040-45-4C-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:
- 45 ns
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-TSOP
SST39LF040-45-4C-WHE-T FAQ
1.How can I place an order for SST39LF040-45-4C-WHE-T through Aetrix?
Please submit a Request for Quotation (RFQ) for SST39LF040-45-4C-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 SST39LF040-45-4C-WHE-T reliable?
The price and inventory of SST39LF040-45-4C-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 SST39LF040-45-4C-WHE-T is usually 5 days.
3.What payment methods are accepted for SST39LF040-45-4C-WHE-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST39LF040-45-4C-WHE-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST39LF040-45-4C-WHE-T?
SST39LF040-45-4C-WHE-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST39LF040-45-4C-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 SST39LF040-45-4C-WHE-T?
For technical support, including SST39LF040-45-4C-WHE-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST39LF040-45-4C-WHE-T requirements.
6.How does Aetrix verify that SST39LF040-45-4C-WHE-T is sourced from the original manufacturer or authorized distributors?
All SST39LF040-45-4C-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 SST39LF040-45-4C-WHE-T meets industry standards.
7.What is the process for return or replacement of SST39LF040-45-4C-WHE-T?
All SST39LF040-45-4C-WHE-T units undergo pre-shipment inspection (PSI). If there is an issue with SST39LF040-45-4C-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 SST39LF040-45-4C-WHE-T part is unused and in its original packaging.
Return procedure for SST39LF040-45-4C-WHE-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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