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Microchip Technology SST39LF040-45-4C-B3KE
- Part No.:
- SST39LF040-45-4C-B3KE
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 48-TFBGA
- Datasheet:
-
SST39LF040-45-4C-B3KE.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 48TFBGA
- Quantity:
- Payment:
- Shipping:
Inventory:4,252
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Product details
Overview
SST39LF040-45-4C-B3KE from Microchip Technology is a 4 Mbit (512K × 8) CMOS Multi-Purpose Flash memory IC using SuperFlash technology, operating at 3.0–3.6 V, with 45 ns read access time, uniform 4 KB sector erase, and JEDEC-standard x8 pinout. It serves as nonvolatile program/data storage in embedded microcontroller systems requiring field-upgradable firmware.
For engineers reviewing the SST39LF040-45-4C-B3KE datasheet, SST39LF040-45-4C-B3KE pinout, SST39LF040-45-4C-B3KE application, or SST39LF040-45-4C-B3KE equivalent, key selection criteria include its 3.0–3.6 V single-supply write capability, 100,000-cycle endurance, 100-year data retention, 4 KB sector architecture, and compatibility with standard 8-bit parallel bus interfaces in industrial control and legacy system upgrades.
Technical Context
This device implements a split-gate SuperFlash cell with thick-oxide tunneling injector for enhanced reliability and fixed erase/program timing independent of cycle count. It supports byte-program, sector-erase (4 KB), and chip-erase via JEDEC-compliant command sequences initiated through CE#/WE# control logic.
Write status detection uses Data# Polling (DQ7) and Toggle Bit (DQ6); hardware protection includes noise/glitch immunity (<5 ns pulse rejection), VDD power-up/down detection (<1.5 V inhibit), and software data protection (SDP) with three-byte (program) or six-byte (erase) unlock sequences. All operations are CMOS I/O compatible and conform to JEDEC standard x8 flash pinouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512K × 8), enabling full firmware image storage for mid-complexity 8-bit/16-bit MCUs |
| Read Access Time | 45 ns - supports direct execution (XIP) from flash at up to ~22 MHz system bus clock |
| Supply Voltage | 3.0–3.6 V - single-supply operation eliminates need for charge pumps or external VPP |
| Endurance | 100,000 program/erase cycles - sufficient for >10 years of daily field firmware updates |
| Data Retention | Greater than 100 years - ensures long-term reliability in unpowered storage applications |
| Sector Size | Uniform 4 KB sectors - enables granular firmware partitioning and safe over-the-air update rollback |
| Byte-Program Time | 14 µs typical - allows rapid patching of small code/data segments without blocking host CPU |
Pinout & Package
Package: 48-ball TFBGA (6 mm × 8 mm, B3K footprint), RoHS compliant, suitable for high-density PCB layouts with fine-pitch routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | A0–A17 used for 512K × 8 addressing; A18 selects upper half of 4 Mbit array (SST39LF040 only) |
| DQ0–DQ7 | Data Input/Output | 8-bit bidirectional data bus; tri-stated when CE# or OE# is high; latched internally during writes |
| CE# | Chip Enable | Active-low chip select; must be low to enable read/write operations; controls standby current (1 µA) |
| OE# | Output Enable | Active-low output gate; used to control data bus timing independently of CE# during read cycles |
| WE# | Write Enable | Active-low write strobe; initiates byte-program, sector-erase, and chip-erase command sequences |
| VDD | Power Supply | 3.0–3.6 V supply; powers core logic and SuperFlash array; internal VPP generation eliminates external high-voltage source |
| VSS | Ground | Reference ground for all I/O and core circuitry; two dedicated VSS balls in TFBGA package |
| NC | No Connect | Balls A5, B3, C1, D1, E1, F1, G1, H1, H2, H3, H4, H5, H6, H7, H8 - electrically isolated per datasheet |
Key Features
| Feature | Design Value |
|---|---|
| SuperFlash Technology | Split-gate cell with thick-oxide tunneling injector delivers fixed 14 µs program and 18 ms sector-erase times across full lifecycle |
| Software Data Protection (SDP) | Three-byte unlock sequence required for programming; six-byte sequence for erasing - prevents accidental writes during power transitions |
| End-of-Write Detection | DQ7 (Data# Polling) and DQ6 (Toggle Bit) provide real-time status without polling delay or external hardware |
| JEDEC Standard Compliance | Pinout and command set match industry-standard x8 flash memories - enables drop-in replacement in existing designs |
| Low Power Standby | 1 µA typical standby current at VDD = 3.6 V - critical for battery-backed or energy-harvesting embedded systems |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded System Upgrade |
|---|---|
Use Scenario: Storing ladder logic and configuration data in programmable logic controllers deployed in factory automation environments with ambient temperatures up to +70°C. IC Role / Device Role / Timing Role: Nonvolatile program memory mapped to MCU address space; accessed via 8-bit parallel bus with 45 ns read latency. Use Value: 100,000-cycle endurance supports frequent firmware revisions during commissioning and maintenance; 100-year retention ensures data integrity over equipment lifetime. |
Use Scenario: Replacing obsolete EPROMs (e.g., 27C040) in legacy medical devices and test equipment where board space and socket compatibility are constrained. IC Role / Device Role / Timing Role: Pin-compatible x8 flash replacement with identical PLCC/TSOP footprints and JEDEC command set. Use Value: Eliminates UV erasers and programmers; enables in-system reprogramming via existing MCU firmware without hardware modification. |
| Automotive Body Control Module | Consumer Appliance Configuration Memory |
Use Scenario: Holding calibration tables and diagnostic event logs in automotive body control modules operating across -40°C to +85°C (industrial grade variant). IC Role / Device Role / Timing Role: EEPROM-replacement storage for infrequently updated parameters; accessed asynchronously via GPIO-banged or dedicated memory interface. Use Value: Superior reliability vs. EEPROM: 10× higher endurance and 10× longer retention at elevated temperature; no wear-leveling firmware required. |
Use Scenario: Storing user preferences, calibration offsets, and safety-critical settings in smart home appliances (e.g., ovens, HVAC controllers) with no battery backup. IC Role / Device Role / Timing Role: Standalone configuration memory interfaced to 8-bit MCU via parallel bus; powered only during setup or update cycles. Use Value: 1 µA standby current extends shelf life and reduces parasitic drain; sector-erase enables safe partial updates without corrupting active settings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT49BV040 | 4 Mbit (512K × 8), 3.0–3.6 V, 55 ns access, same 32-pin TSOP/PLCC packages; lacks SuperFlash speed (20 µs program vs. 14 µs) | Compatible in pinout and command set but slower timing requires MCU wait-state insertion in high-speed systems | Select AT49BV040 only if 55 ns read and 20 µs program are acceptable; verify timing margins in existing design |
| SST39VF040-70-4C-B3KE | Same density and package, but 2.7–3.6 V operation and 70 ns read access; wider voltage range enables single-supply battery operation down to 2.7 V | Preferred for portable or wide-input-voltage systems; not suitable for 3.0 V minimum-only designs due to slower timing | Choose SST39VF040-70-4C-B3KE when system VDD varies below 3.0 V; avoid if 45 ns timing is required for XIP performance |
Compared with AT49BV040 and SST39VF040-70-4C-B3KE, the SST39LF040-45-4C-B3KE provides the fastest read (45 ns) and program (14 µs) performance within its 3.0–3.6 V operating window, making it optimal for timing-critical embedded boot memory and real-time firmware patching where voltage stability is assured.
Availability
SST39LF040-45-4C-B3KE is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy embedded system upgrades, and automotive body control module applications requiring stable component supply, long-lifecycle support, and guaranteed RoHS compliance.
Supply support for SST39LF040-45-4C-B3KE 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, acquired Silicon Storage Technology (SST) in 2010 to expand its nonvolatile memory portfolio.
The SST39LF/VF series was designed specifically for cost-sensitive, high-reliability embedded systems requiring field-upgradable firmware storage with robust data retention and simplified power architecture - targeting industrial, automotive, and consumer applications.
FAQ
What is the maximum operating frequency supported by SST39LF040-45-4C-B3KE?
The SST39LF040-45-4C-B3KE does not specify a maximum clock frequency because it is an asynchronous parallel flash memory. Its 45 ns read access time implies reliable operation with system bus cycles ≥45 ns (i.e., ≤22.2 MHz sustained read rate). Timing depends on CE#, OE#, and address setup/hold constraints defined in Table 12 of the datasheet, not an internal clock. The SST39LF040-45-4C-B3KE operates without a clock signal.
Does SST39LF040-45-4C-B3KE require an external VPP voltage for programming?
No. The SST39LF040-45-4C-B3KE integrates internal VPP generation and performs all program and erase operations using only the 3.0–3.6 V VDD supply. No external high-voltage source, charge pump circuitry, or special programming voltage rail is needed - simplifying board design and reducing BOM cost. This capability is inherent to SST's SuperFlash technology and applies to every SST39LF040-45-4C-B3KE unit.
How many address lines does SST39LF040-45-4C-B3KE use in its 48-ball TFBGA package?
The SST39LF040-45-4C-B3KE uses 19 address lines (A0–A18) to access its 512K × 8 array. In the 48-ball TFBGA (B3K) package, A0–A14, A15, A16, A17, and A18 are assigned to specific balls per Figure 4 of DS25023A; A18 is active only for the 4 Mbit variant and distinguishes SST39LF040 from lower-density family members. All 19 lines are physically present and functional in this part number.
Is SST39LF040-45-4C-B3KE pin-compatible with the SST39LF020-45-4C-B3KE?
No. While both share the same 48-ball TFBGA (B3K) package and JEDEC x8 pinout, the SST39LF040-45-4C-B3KE requires A18 for full addressing and assigns it to ball A1, whereas the SST39LF020-45-4C-B3KE leaves A18 unconnected (NC). Using SST39LF040-45-4C-B3KE in an SST39LF020-design risks incorrect upper-sector addressing unless A18 is properly terminated. The SST39LF040-45-4C-B3KE is not a drop-in replacement for lower-density variants.
What software command sequence is required to perform a sector erase on SST39LF040-45-4C-B3KE?
A six-byte software command sequence is required: 0x5555/0xAA → 0x2AAA/0x55 → 0x5555/0x80 → 0x5555/0xAA → 0x2AAA/0x55 → [Sector Address]/0x30. The sector address uses AMS–A12 (A18–A12 for SST39LF040), latched on the sixth WE# falling edge. This sequence is mandatory per datasheet Table 4 and activates hardware protection - issuing any invalid byte aborts to read mode. The SST39LF040-45-4C-B3KE enforces this for every sector-erase operation.
SST39LF040-45-4C-B3KE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- SST39 MPF™
- Package/Case:
- 48-TFBGA
- Packaging:
- Tray
- 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:
- 48-TFBGA
SST39LF040-45-4C-B3KE FAQ
1.How can I place an order for SST39LF040-45-4C-B3KE through Aetrix?
Please submit a Request for Quotation (RFQ) for SST39LF040-45-4C-B3KE 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-B3KE reliable?
The price and inventory of SST39LF040-45-4C-B3KE 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-B3KE is usually 5 days.
3.What payment methods are accepted for SST39LF040-45-4C-B3KE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST39LF040-45-4C-B3KE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST39LF040-45-4C-B3KE?
SST39LF040-45-4C-B3KE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST39LF040-45-4C-B3KE 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-B3KE?
For technical support, including SST39LF040-45-4C-B3KE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST39LF040-45-4C-B3KE requirements.
6.How does Aetrix verify that SST39LF040-45-4C-B3KE is sourced from the original manufacturer or authorized distributors?
All SST39LF040-45-4C-B3KE 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-B3KE meets industry standards.
7.What is the process for return or replacement of SST39LF040-45-4C-B3KE?
All SST39LF040-45-4C-B3KE units undergo pre-shipment inspection (PSI). If there is an issue with SST39LF040-45-4C-B3KE, 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-B3KE part is unused and in its original packaging.
Return procedure for SST39LF040-45-4C-B3KE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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