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Microchip Technology SST39LF040-55-4I-NHE
- Part No.:
- SST39LF040-55-4I-NHE
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
SST39LF040-55-4I-NHE.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,269
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Product details
Overview
SST39LF040-55-4I-NHE from Microchip Technology (formerly Silicon Storage Technology) is a 4 Mbit (512K × 8) CMOS Multi-Purpose Flash memory IC with single 3.0–3.6V supply, 55 ns read access time, and JEDEC-standard x8 parallel interface. It delivers byte-program capability (14 µs typical), sector-erase (18 ms typical), and chip-erase (70 ms typical) for embedded firmware storage in industrial control modules.
For engineers reviewing the SST39LF040-55-4I-NHE datasheet, SST39LF040-55-4I-NHE pinout, SST39LF040-55-4I-NHE application, or SST39LF040-55-4I-NHE equivalent, key selection criteria include its 3.0–3.6V VDD operating range, 512K × 8 organization, PLCC-32 package, 100,000-cycle endurance, and hardware/software data protection schemes.
Technical Context
This device 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 supports standard microprocessor bus interfacing via CE#, OE#, and WE# control lines with latched address/data inputs.
Operation relies on JEDEC-compliant command sequences: three-byte software unlock for byte-program, six-byte sequence for sector-erase (30H) or chip-erase (10H), and toggle-bit (DQ6) or data-polling (DQ7) for end-of-write detection. Address mapping uses AMS = A18 for SST39LF040, supporting uniform 4 KByte sectors across the full 512K × 8 array.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512K × 8) - provides sufficient space for boot code, configuration tables, and field-upgradable firmware in resource-constrained systems. |
| Read Access Time | 55 ns - enables direct execution from flash (XIP) in 14 MHz microcontroller systems without wait states. |
| VDD Operating Range | 3.0–3.6V - compatible with legacy 3.3V logic rails and eliminates need for auxiliary voltage regulators. |
| Endurance | 100,000 program/erase cycles - supports frequent firmware updates in industrial HMI and programmable logic controllers. |
| Data Retention | >100 years - ensures long-term reliability in unattended infrastructure equipment without periodic refresh. |
| Standby Current | 1 µA typical - minimizes power draw during sleep modes in battery-backed or energy-sensitive applications. |
| Byte-Program Time | 14 µs typical - reduces firmware patch latency and enables real-time parameter logging at sub-millisecond intervals. |
Pinout & Package
Package: 32-lead PLCC (Plastic Leaded Chip Carrier), RoHS compliant, standard pinout per JEDEC MS-026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | A0–A17 provide full 512K × 8 addressing; A18 is AMS (Most Significant Address) and used only for sector/block selection during erase commands. |
| DQ0–DQ7 | Data I/O | Bidirectional 8-bit data bus; outputs tri-stated when CE# or OE# is high; latched internally during write cycles. |
| CE# | Chip Enable | Active-low chip select; device enters standby mode (1 µA) when high; required low for all operations except write-inhibit. |
| OE# | Output Enable | Active-low output gate; controls data bus drive; must be low with CE# for valid read data; high forces high-impedance state. |
| WE# | Write Enable | Active-low write control; initiates byte-program, sector-erase, and chip-erase command sequences; timing-critical for command latching. |
| VDD | Power Supply | 3.0–3.6V supply; internal VPP generation eliminates need for external high-voltage programming supply. |
| VSS | Ground | Reference ground for all signals and power; requires low-impedance connection to minimize noise coupling during erase/write. |
| NC | No Connection | Pins 12, 16, 24, and 31 are unconnected; must remain floating or tied to ground per PCB layout best practices. |
Key Features
| Feature | Design Value |
|---|---|
| SuperFlash Technology | Split-gate cell with thick-oxide tunneling injector enables fixed 14 µs program and 18 ms sector-erase times regardless of accumulated cycles - eliminates software de-rating. |
| Hardware + Software Data Protection | Glitch immunity (<5 ns pulses rejected), VDD power-up/down detection, and mandatory 3-byte unlock sequence prevent accidental writes during brown-out or reset conditions. |
| JEDEC-Compliant Command Set | Standardized 3-byte (program) and 6-byte (erase) command sequences ensure interoperability with existing flash drivers and bootloader firmware stacks. |
| Uniform 4 KByte Sectors | 128 independent sectors allow granular firmware partitioning - e.g., separate sectors for bootloader, application, and calibration data - improving update safety and rollback capability. |
| Toggle Bit / Data# Polling | DQ6 toggles during active write; DQ7 complements true data until completion - enables non-blocking polling without dedicated status registers or interrupts. |
Applications
| Industrial PLC Firmware Storage | Medical Device Configuration Memory |
|---|---|
Use Scenario: Storing ladder logic programs and I/O mapping tables 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 directly to microcontroller address space; accessed via parallel bus with CE#/OE#/WE# handshaking. Use Value: 100,000-cycle endurance supports weekly firmware updates over 20+ years; 55 ns access enables deterministic scan-cycle timing without CPU wait states. | 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 write-inhibit and software lock; sector-erase allows selective reset of calibration data without affecting firmware. Use Value: >100-year data retention guarantees traceability across product lifetime; 1 µA standby current extends battery life in handheld units between charges. |
| Automotive Infotainment Bootloader | Networking Equipment Parameter Tables |
Use Scenario: Hosting secure bootloader code in automotive head units where firmware must survive thermal cycling (-40°C to +85°C) and ESD events per ISO 10605. IC Role / Device Role / Timing Role: Primary boot memory accessed at power-on reset; executes XIP (execute-in-place) to load application image into RAM. Use Value: 3.0–3.6V VDD range matches automotive 3.3V rail tolerances; RoHS compliance meets ELV directive requirements for vehicle recycling. | Use Scenario: Storing MAC address tables, VLAN configurations, and QoS policies in managed Ethernet switches requiring field-upgradable settings. IC Role / Device Role / Timing Role: Parallel-interface configuration EEPROM replacement; accessed by switch controller during initialization and runtime reconfiguration. Use Value: Uniform 4 KByte sectors enable atomic updates of policy sets; chip-erase (70 ms) allows rapid factory reset without external programming hardware. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT49BV040T-70PU | 4 Mbit (512K × 8), 70 ns access, 2.7–3.6V VDD, PLCC-32 - slower read timing and wider voltage range than SST39LF040-55-4I-NHE. | Requires longer read wait states in 14 MHz systems; suitable for mixed-voltage designs where 2.7V operation is needed. | Select AT49BV040T-70PU only if system VDD may dip below 3.0V; otherwise SST39LF040-55-4I-NHE offers superior speed and lower active current. |
| MX29LV040CTTI-70G | 4 Mbit (512K × 8), 70 ns access, 3.0–3.6V VDD, TSOP-32 - identical voltage and density but different package and timing. | TSOP-32 footprint incompatible with PLCC-32 PCB; 70 ns access requires additional wait states versus 55 ns. | Choose MX29LV040CTTI-70G only for new designs targeting surface-mount assembly; SST39LF040-55-4I-NHE remains optimal for PLCC-based legacy boards. |
Compared with AT49BV040T-70PU and MX29LV040CTTI-70G, SST39LF040-55-4I-NHE delivers the fastest 55 ns read access in its voltage class, lowest 1 µA standby current, and proven SuperFlash reliability - making it ideal for performance-critical, long-lifecycle industrial and medical applications where timing determinism and data integrity are non-negotiable.
Availability
SST39LF040-55-4I-NHE is available at Aetrix Electronics and suitable for industrial control systems, medical diagnostics equipment, automotive infotainment modules, and networking infrastructure requiring stable component supply and long-term obsolescence management.
Supply support for SST39LF040-55-4I-NHE 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 SST39LF/VF family of parallel flash memories.
The SST39LF040 product line was designed specifically for cost-sensitive, high-reliability embedded systems requiring fast, low-power, and field-upgradable nonvolatile storage - particularly where pin-compatible migration from EPROM or older flash devices is required.
FAQ
What is the maximum operating temperature range for SST39LF040-55-4I-NHE?
The SST39LF040-55-4I-NHE is rated for commercial operation from 0°C to +70°C. Its "I" suffix denotes industrial-grade screening, but per DS25023B Table 5, the SST39LF series (including SST39LF040-55-4I-NHE) is specified only for 0°C to +70°C ambient. For -40°C to +85°C operation, the SST39VF040 variant is required.
Does SST39LF040-55-4I-NHE support both CE#-controlled and WE#-controlled write operations?
Yes, SST39LF040-55-4I-NHE supports both CE#- and WE#-controlled write operations. Figures 5 and 6 in DS25023B show identical timing for byte-program using either signal as the primary strobe, provided minimum pulse widths (40 ns) and setup/hold times are met. The device treats CE# and WE# as functionally interchangeable for command initiation.
How many address pins does SST39LF040-55-4I-NHE require for full memory access?
SST39LF040-55-4I-NHE requires 18 physical address pins (A0–A17) for byte addressing across its 512K × 8 array. The most significant address (AMS) is A18, used only during sector/block erase commands - it is not a dedicated pin but derived from A18 functionality within the PLCC-32 pinout (pin 32).
What is the purpose of the NC pins on SST39LF040-55-4I-NHE in PLCC-32 package?
SST39LF040-55-4I-NHE has four NC (No Connection) pins in its PLCC-32 package: pins 12, 16, 24, and 31. These pins are electrically unconnected to the die and must remain floating or be tied to ground per PCB layout guidelines to avoid noise coupling or mechanical stress on the leadframe.
Can SST39LF040-55-4I-NHE be used as a direct replacement for SST39LF020-55-4I-NHE on the same PCB?
No, SST39LF040-55-4I-NHE is not a direct replacement for SST39LF020-55-4I-NHE. While both share the same PLCC-32 package and pinout, the SST39LF040 requires A18 (AMS) for sector addressing - meaning the host system must drive A18 appropriately during erase operations, unlike the SST39LF020 which uses A17 as AMS. Firmware and address decoding logic must be verified for compatibility.
SST39LF040-55-4I-NHE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- SST39 MPF™
- Package/Case:
- 32-LCC (J-Lead)
- Packaging:
- Tube
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (11.43x13.97)
SST39LF040-55-4I-NHE FAQ
1.How can I place an order for SST39LF040-55-4I-NHE through Aetrix?
Please submit a Request for Quotation (RFQ) for SST39LF040-55-4I-NHE 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 SST39LF040-55-4I-NHE reliable?
The price and inventory of SST39LF040-55-4I-NHE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SST39LF040-55-4I-NHE is usually 5 days.
3.What payment methods are accepted for SST39LF040-55-4I-NHE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST39LF040-55-4I-NHE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST39LF040-55-4I-NHE?
SST39LF040-55-4I-NHE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST39LF040-55-4I-NHE 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 SST39LF040-55-4I-NHE?
For technical support, including SST39LF040-55-4I-NHE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST39LF040-55-4I-NHE requirements.
6.How does Aetrix verify that SST39LF040-55-4I-NHE is sourced from the original manufacturer or authorized distributors?
All SST39LF040-55-4I-NHE 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 SST39LF040-55-4I-NHE meets industry standards.
7.What is the process for return or replacement of SST39LF040-55-4I-NHE?
All SST39LF040-55-4I-NHE units undergo pre-shipment inspection (PSI). If there is an issue with SST39LF040-55-4I-NHE, 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 SST39LF040-55-4I-NHE part is unused and in its original packaging.
Return procedure for SST39LF040-55-4I-NHE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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