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Microchip Technology SST39LF040-55-4C-WHE-T
- Part No.:
- SST39LF040-55-4C-WHE-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
SST39LF040-55-4C-WHE-T.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,293
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Product details
Overview
SST39LF040-55-4C-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 3.0–3.6 V, delivers 55 ns read access time, supports uniform 4 KB sector erase, and features JEDEC-standard x8 pinout and command set. It is commonly used in firmware storage for industrial controllers and legacy BIOS modules.
For engineers reviewing the SST39LF040-55-4C-WHE-T datasheet, SST39LF040-55-4C-WHE-T pinout, SST39LF040-55-4C-WHE-T application, or SST39LF040-55-4C-WHE-T equivalent, key selection criteria include its 3.0–3.6 V single-supply operation, 55 ns read timing, 100,000-cycle endurance, 100-year data retention, and compatibility with standard 8-bit microprocessor buses requiring hardware/software data protection.
Technical Context
The SST39LF040-55-4C-WHE-T implements SST's proprietary SuperFlash technology with split-gate cell architecture and thick-oxide tunneling injector, enabling fixed erase/program times independent of cycle count. It uses standard microprocessor write sequences to execute byte-program, sector-erase (30H command), and chip-erase (10H command) via a six-byte software data protection protocol.
Read operations require both CE# and OE# low; outputs enter high-impedance state when either control signal is high. End-of-write detection is supported via Data# Polling (DQ7) and Toggle Bit (DQ6), both valid after the fourth (program) or sixth (erase) WE#/CE# pulse edge - no external VPP supply is needed due to internal generation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512K × 8), providing sufficient space for boot code and configuration tables in resource-constrained 8-bit systems. |
| Read Access Time | 55 ns max - enables direct interface with 14 MHz microcontrollers without wait states. |
| Supply Voltage | 3.0–3.6 V - compatible with 3.3 V logic rails and eliminates need for dual-voltage support circuitry. |
| Endurance | 100,000 program/erase cycles - supports field firmware updates over product lifetime. |
| Data Retention | Greater than 100 years - ensures long-term reliability in unpowered storage applications. |
| Sector Size | Uniform 4 KB sectors - simplifies memory management and allows selective update of functional blocks. |
| Byte-Program Time | 14 µs typical - enables rapid patching of small code/data segments without system stall. |
Pinout & Package
Package: 32-lead TSOP (8 mm × 14 mm), RoHS-compliant, surface-mountable with standard reflow profile (260°C for 10 s).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | A0–A15 used for byte addressing; A16–A18 (AMS) select sector/block during erase - A18 active for SST39LF040. |
| DQ0–DQ7 | Data I/O | Bi-directional 8-bit bus; latched internally during writes; tri-stated when CE# or OE# high. |
| CE# | Chip Enable | Active-low device selection; must be low for read/write - enables multi-chip memory decoding. |
| OE# | Output Enable | Active-low output gating; controls data bus drive - allows shared bus arbitration with other peripherals. |
| WE# | Write Enable | Active-low write control; initiates command latching on falling edge - synchronizes all program/erase sequences. |
| VDD | Power Supply | 3.0–3.6 V supply; powers core logic and SuperFlash array - requires local 3.3 V regulation. |
| VSS | Ground | Reference return path for all signals and power - must be low-inductance connection per layout guidelines. |
| NC | No Connection | Pins 12, 16, 25, 30 are unconnected - must remain floating; no routing or stitching required. |
Key Features
| Feature | Design Value |
|---|---|
| SuperFlash Technology | Split-gate cell design ensures stable erase/program times across full lifecycle - eliminates software de-rating or timeout scaling. |
| Hardware + Software Data Protection | Glitch immunity (<5 ns), VDD power-up/down detection, and mandatory 3-/6-byte unlock sequences prevent accidental writes during brown-out or reset. |
| JEDEC-Compliant Pinout & Commands | Drop-in replacement for industry-standard x8 flash devices - no PCB or firmware changes required for migration. |
| Low Standby Current | 1 µA typical - reduces quiescent power in battery-backed or always-on embedded systems. |
| Toggle Bit / Data# Polling | Asynchronous status reporting via DQ6/DQ7 - frees CPU for parallel tasks during erase/program without polling overhead. |
Applications
| Industrial PLC Firmware Storage | Legacy PC BIOS Memory |
|---|---|
Use Scenario: Storing ladder logic firmware and I/O configuration maps in programmable logic controllers operating in harsh factory environments. IC Role / Device Role / Timing Role: Nonvolatile boot memory mapped to microcontroller address space; accessed at power-on reset and during field firmware updates. Use Value: 100,000-cycle endurance and >100-year retention ensure reliable operation across 15+ year equipment lifecycles without recalibration or replacement. | Use Scenario: Holding BIOS initialization code and hardware configuration settings in desktop motherboards prior to UEFI transition. IC Role / Device Role / Timing Role: x8 parallel interface flash acting as primary boot ROM; directly addressed by chipset during POST sequence. Use Value: 55 ns read access enables zero-wait-state execution from flash, reducing boot latency compared to slower alternatives. |
| Medical Device Calibration Data | Telecom Line Card Configuration |
Use Scenario: Storing sensor calibration coefficients and safety-critical operational parameters in portable diagnostic equipment. IC Role / Device Role / Timing Role: Secure, tamper-resistant configuration store accessed only during device startup or service mode. Use Value: Hardware write inhibit and software lock sequences prevent unauthorized modification - critical for FDA-regulated data integrity. | Use Scenario: Holding FPGA bitstreams and port mapping tables in carrier-grade DSLAM line cards requiring hot-swap capability. IC Role / Device Role / Timing Role: Field-upgradable configuration memory supporting remote provisioning and protocol adaptation. Use Value: Uniform 4 KB sector erase allows updating individual line card profiles without disrupting adjacent services or requiring full reflash. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV040B-55EC | 55 ns access, 4 Mbit (512K × 8), 3.0–3.6 V, but uses AMD-style command set (not JEDEC-compatible); lacks Toggle Bit status reporting. | Requires firmware rewrite for command sequence handling; not drop-in for SST39LF040-55-4C-WHE-T designs. | Select only if legacy AMD ecosystem integration is required and software can accommodate non-JEDEC unlock flow. |
| MX29LV040CTTI-55G | 55 ns access, 4 Mbit, 3.0–3.6 V, JEDEC-compatible pinout and command set; identical sector architecture and endurance spec. | Direct functional replacement with same timing, protection, and interface behavior - validated for SST39LF040-55-4C-WHE-T footprint. | Preferred alternative where second-source assurance or extended temperature range (-40°C to +85°C) is needed. |
Compared with AM29LV040B-55EC, SST39LF040-55-4C-WHE-T offers JEDEC-standard command compatibility and Toggle Bit status feedback, simplifying firmware development; versus MX29LV040CTTI-55G, it shares identical electrical and functional behavior but differs in manufacturer qualification and long-term availability roadmap.
Availability
SST39LF040-55-4C-WHE-T is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy BIOS modules, medical calibration data retention, and telecom line card configuration requiring stable component supply and long-lifecycle support.
Supply support for SST39LF040-55-4C-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 acquired Silicon Storage Technology (SST) in 2016 and maintains the SuperFlash product line for cost-sensitive, high-reliability embedded memory applications.
The SST39LF series was designed specifically for 3.3 V systems needing robust, low-power, sector-erasable flash with JEDEC-standard compatibility - targeting industrial, computing, and communications markets where firmware integrity and field upgradeability are critical.
FAQ
What is the maximum operating temperature range for SST39LF040-55-4C-WHE-T?
The SST39LF040-55-4C-WHE-T is rated for commercial operation from 0°C to +70°C. Its 3.0–3.6 V supply range and 100,000-cycle endurance make it suitable for ambient-controlled industrial enclosures. For extended temperature use, consider the SST39VF040 variant, which supports -40°C to +85°C.
Does SST39LF040-55-4C-WHE-T require an external VPP voltage for programming?
No. The SST39LF040-55-4C-WHE-T integrates internal VPP generation for all program and erase operations, eliminating the need for external high-voltage circuitry. All write functions - including byte-program, sector-erase, and chip-erase - operate solely from the 3.0–3.6 V VDD supply.
How does the software data protection scheme work on SST39LF040-55-4C-WHE-T?
The SST39LF040-55-4C-WHE-T requires a three-byte unlock sequence (5555H/AAH → 2AAAH/55H → 5555H/A0H) before byte-programming, and a six-byte sequence for sector or chip erase. This JEDEC-approved scheme prevents accidental writes during power transitions or noise events - the device ships with protection permanently enabled.
Can SST39LF040-55-4C-WHE-T be used in place of SST39LF020-55-4C-WHE-T without hardware changes?
Yes - both share identical pinout, voltage range, timing, and command set. The SST39LF040-55-4C-WHE-T provides double the density (4 Mbit vs. 2 Mbit) and adds A17/A18 address lines, but unused higher address pins (A17/A18) are NC on SST39LF020 footprints. Firmware must handle the expanded address space to utilize full capacity.
What package type is used for SST39LF040-55-4C-WHE-T?
The SST39LF040-55-4C-WHE-T uses a 32-lead TSOP (8 mm × 14 mm) package, RoHS-compliant and qualified for standard lead-free reflow. Pin assignments match JEDEC MO-142AC, with NC pins at positions 12, 16, 25, and 30 - no modifications needed for existing TSOP-32 layouts.
SST39LF040-55-4C-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:
- 55 ns
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-TSOP (8x14)
SST39LF040-55-4C-WHE-T FAQ
1.How can I place an order for SST39LF040-55-4C-WHE-T through Aetrix?
Please submit a Request for Quotation (RFQ) for SST39LF040-55-4C-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 SST39LF040-55-4C-WHE-T reliable?
The price and inventory of SST39LF040-55-4C-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 SST39LF040-55-4C-WHE-T is usually 5 days.
3.What payment methods are accepted for SST39LF040-55-4C-WHE-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST39LF040-55-4C-WHE-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST39LF040-55-4C-WHE-T?
SST39LF040-55-4C-WHE-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST39LF040-55-4C-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 SST39LF040-55-4C-WHE-T?
For technical support, including SST39LF040-55-4C-WHE-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST39LF040-55-4C-WHE-T requirements.
6.How does Aetrix verify that SST39LF040-55-4C-WHE-T is sourced from the original manufacturer or authorized distributors?
All SST39LF040-55-4C-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 SST39LF040-55-4C-WHE-T meets industry standards.
7.What is the process for return or replacement of SST39LF040-55-4C-WHE-T?
All SST39LF040-55-4C-WHE-T units undergo pre-shipment inspection (PSI). If there is an issue with SST39LF040-55-4C-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 SST39LF040-55-4C-WHE-T part is unused and in its original packaging.
Return procedure for SST39LF040-55-4C-WHE-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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