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Microchip Technology SST39LF040-45-4C-WHE
- Part No.:
- SST39LF040-45-4C-WHE
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
SST39LF040-45-4C-WHE.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,938
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Product details
Overview
SST39LF040-45-4C-WHE from Microchip Technology is a 4 Mbit (512K × 8) CMOS Multi-Purpose Flash memory IC with 3.0–3.6 V single-supply operation, 45 ns read access time, and uniform 4 KB sector-erase architecture. It implements SuperFlash technology for high reliability in embedded firmware storage, BIOS code storage, and configuration memory applications.
For engineers reviewing the SST39LF040-45-4C-WHE datasheet, SST39LF040-45-4C-WHE pinout, SST39LF040-45-4C-WHE application, or SST39LF040-45-4C-WHE equivalent, key selection criteria include JEDEC-standard x8 parallel interface compatibility, hardware/software data protection, toggle-bit and data# polling status detection, and support for byte-program and chip-erase operations within industrial temperature range.
Technical Context
The SST39LF040-45-4C-WHE uses SST's proprietary SuperFlash split-gate cell architecture with thick-oxide tunneling injector, enabling fixed erase/program times independent of cycle count. It supports standard microprocessor bus interfacing via CE#, OE#, and WE# control signals with latched address/data inputs.
It operates in Read, Byte-Program, Sector-Erase, Chip-Erase, and Software Product Identification modes-all initiated via JEDEC-compliant command sequences written to specific address locations (e.g., 5555H/2AAAH). End-of-write detection is implemented via DQ6 (Toggle Bit) and DQ7 (Data# Polling), both valid after the fourth (program) or sixth (erase) WE#/CE# pulse.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512K × 8) - supports full BIOS or boot loader image storage in legacy x86 and microcontroller-based systems. |
| Read Access Time | 45 ns - enables direct execution from flash (XIP) in timing-critical boot sequences without wait states at ≤22 MHz bus clock. |
| Supply Voltage | 3.0–3.6 V - compatible with 3.3 V logic rails and eliminates need for separate VPP programming voltage. |
| Endurance | 100,000 program/erase cycles - sufficient for field firmware updates over 10+ years in industrial control applications. |
| Data Retention | >100 years - ensures nonvolatile storage integrity across product lifecycle without refresh. |
| Sector Size | Uniform 4 KB sectors - allows granular firmware partitioning (e.g., bootloader, config, application) with independent update capability. |
| Write Timing | Byte-program: 14 µs typical; Chip-erase: 70 ms typical - enables fast field reprogramming with predictable worst-case timing for system timeout design. |
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–A18 provide full 512K-word addressing; A12–A18 select 4 KB sector during erase; AMS = A18 for SST39LF040. |
| DQ0–DQ7 | Data Input/Output | Bi-directional x8 data bus; outputs tri-stated when CE# or OE# is high; supports latched write and read data transfer. |
| CE# | Chip Enable | Active-low device select; must be low for all operations except standby; controls power state transition into active mode. |
| OE# | Output Enable | Active-low output gate; enables data output only when CE# is also low; used to avoid bus contention in multi-device systems. |
| WE# | Write Enable | Active-low control for write cycles; latches address/data on falling/rising edges per JEDEC command sequence timing. |
| VDD | Power Supply | 3.0–3.6 V supply; internal charge pump generates programming voltage - no external VPP required. |
| VSS | Ground | Reference ground for all I/O and core logic; requires low-impedance PCB connection to minimize noise coupling during erase/write. |
Key Features
| Feature | Design Value |
|---|---|
| SuperFlash Technology | Split-gate cell with thick-oxide tunneling injector delivers stable 45 ns read access and fixed 14 µs program time across full endurance life. |
| JEDEC-Compliant Command Set | Standardized software commands (e.g., 5555H/2AAAH/A0H for byte-program) ensure interoperability with existing flash management firmware. |
| Dual Status Detection | Simultaneous Toggle Bit (DQ6) and Data# Polling (DQ7) allow flexible, robust end-of-write detection without dedicated status pins. |
| Hardware + Software Data Protection | Glitch immunity (<5 ns pulses rejected), VDD power-up/down detection, and mandatory 3-byte/6-byte unlock sequences prevent accidental writes. |
| Uniform 4 KB Sector Architecture | Enables precise firmware partitioning - e.g., isolate bootloader sector from application updates to prevent bricking during field upgrades. |
Applications
| BIOS/UEFI Firmware Storage | Industrial PLC Configuration Memory |
|---|---|
|
Use Scenario: Storing boot firmware and hardware initialization code in x86-based server motherboards and embedded controllers. IC Role / Device Role / Timing Role: Nonvolatile code storage with XIP-capable 45 ns read access; serves as primary boot source during cold start. Use Value: Eliminates need for external ROM or slow serial flash; supports secure, authenticated updates via sector-locked regions. |
Use Scenario: Retaining user-defined ladder logic, I/O mapping, and calibration tables in programmable logic controllers operating in harsh environments. IC Role / Device Role / Timing Role: Field-updatable configuration store with 100,000-cycle endurance and >100-year data retention. Use Value: Enables remote firmware patching without hardware replacement; sector-erase allows safe partial rewrites without corrupting runtime parameters. |
| Legacy Embedded System Bootloader | Medical Device Parameter Storage |
|
Use Scenario: Hosting second-stage bootloader and recovery image in ARM7/ARM9-based medical imaging subsystems. IC Role / Device Role / Timing Role: Standalone parallel flash accessed directly by processor bus; supports in-system programming via JTAG or UART. Use Value: Provides deterministic boot latency (<100 µs power-up to first read) and failsafe recovery path via protected sector. |
Use Scenario: Storing FDA-mandated device calibration coefficients, usage logs, and safety-critical configuration in portable diagnostic equipment. IC Role / Device Role / Timing Role: Tamper-resistant, long-life nonvolatile memory with hardware write-inhibit during power transitions. Use Value: Meets IEC 62304 data integrity requirements via dual status detection and software/hardware lock mechanisms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar parallel NOR flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MX29LV040CTC-70G | 4 Mbit, 70 ns access, 2.7–3.6 V supply, supports CFI query mode; lacks SuperFlash fixed-timing guarantee. | Requires longer timeout margins for erase/write; suitable where cost sensitivity outweighs timing predictability. | Select when CFI-compliant auto-detection is required and 70 ns read latency is acceptable. |
| EN29LV040A-70TP | 4 Mbit, 70 ns access, 3.0–3.6 V supply, JEDEC-compatible but no toggle-bit status; relies on polling-only detection. | No DQ6 toggle-bit support increases software complexity and CPU overhead during write verification. | Select for legacy designs already using EN29LV series; verify firmware handles absence of toggle-bit detection. |
Compared with MX29LV040CTC-70G and EN29LV040A-70TP, the SST39LF040-45-4C-WHE provides faster 45 ns read access, guaranteed fixed program/erase timing across lifetime, and dual-status detection-reducing firmware development effort and improving real-time system responsiveness.
Availability
SST39LF040-45-4C-WHE is available at Aetrix Electronics and suitable for BIOS firmware storage, industrial PLC configuration, and embedded bootloader applications requiring stable component supply, long-term obsolescence management, and RoHS-compliant sourcing.
Supply support for SST39LF040-45-4C-WHE 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 broad industrial and automotive qualification coverage.
The SST39LF040-45-4C-WHE belongs to Microchip's legacy SST SuperFlash NOR flash product line, designed specifically for reliable, high-speed parallel-interface code and configuration storage in space-constrained embedded systems.
FAQ
What is the maximum operating temperature range for the SST39LF040-45-4C-WHE?
The SST39LF040-45-4C-WHE is rated for commercial temperature operation from 0°C to +70°C. It does not support industrial (-40°C to +85°C) range - that specification applies only to the SST39VF040 variant. The 'C' suffix in SST39LF040-45-4C-WHE explicitly denotes commercial grade, confirmed in Table 5 of DS25023A.
Does the SST39LF040-45-4C-WHE require an external VPP voltage for programming?
No. The SST39LF040-45-4C-WHE integrates an internal charge pump to generate the high voltage needed for programming and erasing. It operates from a single 3.0–3.6 V supply, eliminating the need for external VPP circuitry - a key advantage over older parallel flash technologies.
How many address lines does the SST39LF040-45-4C-WHE use, and what is the most significant address pin?
The SST39LF040-45-4C-WHE uses 19 address lines (A0–A18) to access its 512K × 8 array. Per Table 1 and Figures 2–5, AMS (Most Significant Address) = A18 for the 4 Mbit density, meaning A18 is the highest-order address bit used for sector selection and command decoding.
Can the SST39LF040-45-4C-WHE be used as a drop-in replacement for the SST39LF040-55-4C-WHE?
No - the SST39LF040-45-4C-WHE and SST39LF040-55-4C-WHE differ in maximum read access time (45 ns vs. 55 ns) and associated AC timing parameters (e.g., TRC, TAA). While pinout and command set are identical, system timing margins must be re-validated; it is not a guaranteed drop-in replacement without design review.
What package type is indicated by the 'WHE' suffix in SST39LF040-45-4C-WHE?
The 'WHE' suffix denotes a 32-lead TSOP (Thin Small Outline Package) with 8 mm × 14 mm body dimensions and standard pinout per Figure 3 of DS25023A. This is distinct from PLCC ('W'), TFBGA ('B'), or WFBGA ('M') variants - 'WHE' is Microchip's specific ordering code for the TSOP package.
SST39LF040-45-4C-WHE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- SST39 MPF™
- Package/Case:
- 32-TFSOP (0.488", 12.40mm Width)
- 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:
- 32-TSOP
SST39LF040-45-4C-WHE FAQ
1.How can I place an order for SST39LF040-45-4C-WHE through Aetrix?
Please submit a Request for Quotation (RFQ) for SST39LF040-45-4C-WHE 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 reliable?
The price and inventory of SST39LF040-45-4C-WHE 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 is usually 5 days.
3.What payment methods are accepted for SST39LF040-45-4C-WHE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST39LF040-45-4C-WHE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST39LF040-45-4C-WHE?
SST39LF040-45-4C-WHE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST39LF040-45-4C-WHE 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?
For technical support, including SST39LF040-45-4C-WHE 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 requirements.
6.How does Aetrix verify that SST39LF040-45-4C-WHE is sourced from the original manufacturer or authorized distributors?
All SST39LF040-45-4C-WHE 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 meets industry standards.
7.What is the process for return or replacement of SST39LF040-45-4C-WHE?
All SST39LF040-45-4C-WHE units undergo pre-shipment inspection (PSI). If there is an issue with SST39LF040-45-4C-WHE, 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 part is unused and in its original packaging.
Return procedure for SST39LF040-45-4C-WHE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SST39LF040-45-4C-WHE Tags
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M24C02-WMN6TP
STMicroelectronics
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AT24C02C-XHM-T
Microchip Technology
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AT21CS01-STUM10-T
Microchip Technology
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AT24C02C-SSHM-T
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24LC01BT-I/OT
Microchip Technology
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M24C02-FMC6TG
STMicroelectronics
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AT24CS02-SSHM-T
Microchip Technology
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93LC46BT-I/OT
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AT24C04C-SSHM-T
Microchip Technology
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24LC01BT-I/SN
Microchip Technology
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24AA02UIDT-I/OT
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AT24C08C-STUM-T
Microchip Technology
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