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Microchip Technology SST39SF040-45-4I-NHE-T
- Part No.:
- SST39SF040-45-4I-NHE-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
SST39SF040-45-4I-NHE-T.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,580
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Product details
Overview
SST39SF040-45-4I-NHE-T from Microchip Technology is a 4 Mbit (512K × 8) CMOS Multi-Purpose Flash memory IC with single 4.5–5.5V supply operation, 55 ns read access time, and JEDEC-standard x8 parallel interface. It features uniform 4 KByte sector-erase architecture, 100,000 program/erase endurance cycles, and >100 years data retention - deployed in industrial firmware storage, BIOS/UEFI code storage, and embedded configuration memory systems.
For engineers reviewing the SST39SF040-45-4I-NHE-T datasheet, SST39SF040-45-4I-NHE-T pinout, SST39SF040-45-4I-NHE-T application, or SST39SF040-45-4I-NHE-T equivalent, this page delivers verified technical context, JEDEC-compliant timing behavior, SuperFlash reliability metrics, industrial-grade temperature support (−40°C to +85°C), and real-world design implications for firmware update architectures and legacy system upgrades.
Technical Context
The SST39SF040-45-4I-NHE-T implements SST's proprietary SuperFlash split-gate cell technology with thick-oxide tunneling injector, enabling fixed erase/program times independent of cycle count - eliminating software de-rating required by conventional flash. Its command-set architecture uses six-byte software data protection (SDP) sequences for sector-erase and chip-erase, with hardware-level noise/glitch immunity and VDD power-up/down detection.
It operates in standard x8 parallel mode with TTL-compatible I/O, supports CE#/OE#/WE# control logic per JEDEC JESD21-C, and provides dual end-of-write detection via Data# Polling (DQ7) and Toggle Bit (DQ6). Address decoding spans A0–A17 (18-bit), supporting full 512K × 8 addressing with NC pins at A18/A19 positions in PLCC package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512K × 8) - supports full BIOS/firmware images up to 512 KB without bank switching |
| Read Access Time | 55 ns - enables direct execution from flash (XIP) in 14 MHz microcontroller systems |
| Supply Voltage | 4.5–5.5 V - compatible with legacy 5 V logic rails and eliminates need for external voltage regulators |
| Endurance | 100,000 program/erase cycles - sufficient for field firmware updates over 10+ year product lifecycle |
| Data Retention | >100 years - ensures configuration integrity across industrial equipment service life without refresh |
| Operating Temperature | −40°C to +85°C - qualified for industrial control, automotive body electronics, and telecom infrastructure |
| Sector Size | Uniform 4 KByte sectors - allows granular firmware patching without erasing entire device |
Pinout & Package
Package: 32-lead PLCC (Plastic Leaded Chip Carrier), 11.43 mm × 13.97 mm, RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus; A0–A12 select 4 KByte sector; A13–A17 define sector location within 512K space |
| DQ0–DQ7 | Data Input/Output | x8 bidirectional data bus; DQ7 = Data# Polling bit; DQ6 = Toggle Bit for write completion detection |
| CE# | Chip Enable | Active-low chip select; must be low for read/write; high-Z output when asserted high |
| OE# | Output Enable | Active-low output gate; controls data bus tristate during read; irrelevant during write |
| WE# | Write Enable | Active-low write strobe; latches address/data on rising edge; initiates internal program/erase |
| VDD | Power Supply | +4.5 V to +5.5 V supply; powers core and I/O; internal VPP generation eliminates external high-voltage source |
| VSS | Ground | Reference ground for all signals and internal circuitry |
| NC | No Connection | Pins 16 and 31 are unconnected; must remain floating or tied to ground per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| SuperFlash® Technology | Split-gate cell with thick-oxide tunneling injector enables fixed 18 ms sector-erase and 70 ms chip-erase times across full lifetime |
| Software Data Protection (SDP) | JEDEC-compliant 6-byte command sequence prevents accidental writes during power transitions or noise events |
| End-of-Write Detection | Dual-mode status reporting via DQ7 (Data# Polling) and DQ6 (Toggle Bit) enables deterministic firmware update sequencing |
| Low Power Standby | 30 µA typical standby current (CMOS input mode) reduces system power budget in always-on embedded controllers |
| TTL I/O Compatibility | Direct interface with 5 V microcontrollers and FPGAs without level-shifting; VIH = 2.0 V min, VOL = 0.4 V max |
Applications
| Firmware Storage in Industrial PLCs | Legacy BIOS Code Storage |
|---|---|
|
Use Scenario: Storing programmable logic controller firmware updated via RS-485 or CAN bus. IC Role / Device Role / Timing Role: Nonvolatile code storage with sector-erase capability enabling field patching of individual function modules. Use Value: 4 KByte sector granularity avoids full reflash; 100,000-cycle endurance supports 5+ years of quarterly firmware updates. |
Use Scenario: Holding legacy PC-compatible BIOS code in embedded x86-based control systems. IC Role / Device Role / Timing Role: x8 parallel boot ROM replacement with 55 ns access time meeting Intel 80486/Pentium timing requirements. Use Value: Direct 5 V compatibility eliminates level shifters; JEDEC pinout ensures drop-in replacement for older EPROMs. |
| Configuration Memory in Telecom Line Cards | Bootloader Storage in RISC-Based Edge Devices |
|
Use Scenario: Storing line card initialization parameters, calibration tables, and protocol stacks in carrier-grade DSLAMs. IC Role / Device Role / Timing Role: Configuration EEPROM substitute with faster write performance and superior data retention. Use Value: >100-year data retention guarantees parameter integrity across 15+ year telecom deployments without backup power. |
Use Scenario: Hosting secure bootloader code in ARM Cortex-M4-based IoT gateways requiring tamper-resistant firmware staging. IC Role / Device Role / Timing Role: First-stage boot memory accessed before DRAM initialization; supports XIP execution. Use Value: 55 ns read time enables zero-wait-state execution; hardware write inhibit prevents corruption during brown-out conditions. |
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 |
|---|---|---|---|
| MX29LV040CTTI-70G | 4 Mbit, 70 ns access, 3.0 V core (3.0–3.6 V), requires separate 12 V for programming | Requires voltage translation for 5 V systems; not pin-compatible due to different VPP pin assignment | Select only if migrating to 3.3 V system architecture and redesigning power delivery |
| AM29LV040B-55EC | 4 Mbit, 55 ns access, 3.0 V core (2.7–3.6 V), supports 12 V VPP or 5 V-only programming | Uses AMD command set instead of JEDEC; requires firmware adaptation for erase/write sequences | Choose when existing AMD-based bootloader codebase exists and JEDEC compatibility is not required |
Compared with MX29LV040CTTI-70G and AM29LV040B-55EC, the SST39SF040-45-4I-NHE-T uniquely delivers true 5 V single-supply operation with JEDEC-standard command set and fixed-timing SuperFlash architecture - simplifying legacy 5 V system upgrades without firmware or PCB changes.
Availability
SST39SF040-45-4I-NHE-T is available at Aetrix Electronics and suitable for industrial control firmware storage, legacy BIOS replacement, and telecom configuration memory applications requiring stable component supply and long-term obsolescence management.
Supply support for SST39SF040-45-4I-NHE-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 emphasis on industrial, automotive, and communications markets.
The SST39SF040-45-4I-NHE-T belongs to Microchip's legacy SST SuperFlash family, designed specifically for cost-sensitive, 5 V-based embedded systems requiring reliable, long-life nonvolatile code and configuration storage without complex power management.
FAQ
What is the maximum operating frequency supported by SST39SF040-45-4I-NHE-T?
The SST39SF040-45-4I-NHE-T does not operate at a clock frequency - it is an asynchronous parallel NOR flash memory. Its performance is defined by access timing: 55 ns read cycle time (TRC) and 20 µs byte-program time (TBP). System timing is governed by CE#, OE#, and WE# signal setup/hold requirements per Table 11 and Table 12 in the datasheet, not by a clock input.
Does SST39SF040-45-4I-NHE-T require an external high-voltage supply for programming?
No. The SST39SF040-45-4I-NHE-T integrates internal charge pump circuitry that generates the required programming voltage (VPP) from the standard 4.5–5.5 V VDD supply. This eliminates the need for external 12 V sources or dedicated VPP pins, simplifying board design and reducing BOM count compared to older EPROM or early flash devices.
How is sector erase initiated on SST39SF040-45-4I-NHE-T?
Sector erase on SST39SF040-45-4I-NHE-T is initiated via a six-byte JEDEC-standard software command sequence: 5555H/AAH → 2AAAH/55H → 5555H/80H → 5555H/AAH → 2AAAH/55H → SAX/30H, where SAX is the 13-bit sector address (A12–A0) selecting one of 128 uniform 4 KByte sectors. The final byte (30H) triggers internal erase after the sixth WE# pulse.
Is SST39SF040-45-4I-NHE-T compatible with standard EPROM sockets?
Yes - the SST39SF040-45-4I-NHE-T in 32-pin PDIP or 32-lead PLCC packages uses JEDEC-standard pinouts for x8 memories and operates at 5 V, making it a functional and physical drop-in replacement for 27C040 EPROMs in most legacy designs. However, firmware must implement the SST-specific command sequences for programming and erase, not the EPROM UV-erase or programming algorithms.
What is the purpose of the NC pins on SST39SF040-45-4I-NHE-T?
The SST39SF040-45-4I-NHE-T has two NC (No Connect) pins - Pin 16 and Pin 31 in the 32-lead PLCC package. These pins are internally unconnected and must remain electrically floating. They are not reserved for future functionality or test purposes; tying them to VDD, VSS, or signals may cause undefined behavior or damage. Layout guidelines recommend leaving them unstubbed and unconnected.
SST39SF040-45-4I-NHE-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- SST39 MPF™
- Package/Case:
- 32-LCC (J-Lead)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (11.43x13.97)
SST39SF040-45-4I-NHE-T FAQ
1.How can I place an order for SST39SF040-45-4I-NHE-T through Aetrix?
Please submit a Request for Quotation (RFQ) for SST39SF040-45-4I-NHE-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 SST39SF040-45-4I-NHE-T reliable?
The price and inventory of SST39SF040-45-4I-NHE-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SST39SF040-45-4I-NHE-T is usually 5 days.
3.What payment methods are accepted for SST39SF040-45-4I-NHE-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST39SF040-45-4I-NHE-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST39SF040-45-4I-NHE-T?
SST39SF040-45-4I-NHE-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST39SF040-45-4I-NHE-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 SST39SF040-45-4I-NHE-T?
For technical support, including SST39SF040-45-4I-NHE-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST39SF040-45-4I-NHE-T requirements.
6.How does Aetrix verify that SST39SF040-45-4I-NHE-T is sourced from the original manufacturer or authorized distributors?
All SST39SF040-45-4I-NHE-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 SST39SF040-45-4I-NHE-T meets industry standards.
7.What is the process for return or replacement of SST39SF040-45-4I-NHE-T?
All SST39SF040-45-4I-NHE-T units undergo pre-shipment inspection (PSI). If there is an issue with SST39SF040-45-4I-NHE-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 SST39SF040-45-4I-NHE-T part is unused and in its original packaging.
Return procedure for SST39SF040-45-4I-NHE-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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