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Microchip Technology SST39SF040-55-4I-WHE
- Part No.:
- SST39SF040-55-4I-WHE
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
SST39SF040-55-4I-WHE.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,671
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Product details
Overview
SST39SF040-55-4I-WHE from Microchip Technology is a 4 Mbit (512K × 8) CMOS Multi-Purpose Flash memory IC with 55 ns read access time, single 4.5–5.5V supply operation, and uniform 4 KByte sector-erase architecture. It implements SuperFlash technology for high reliability, supports JEDEC-standard x8 pinout and command set, and is used in embedded firmware storage, BIOS/UEFI code retention, and industrial controller configuration memory.
For engineers reviewing the SST39SF040-55-4I-WHE datasheet, SST39SF040-55-4I-WHE pinout, SST39SF040-55-4I-WHE application, or SST39SF040-55-4I-WHE equivalent, key selection criteria include 55 ns read timing, 4.5–5.5V VDD tolerance, sector-erase capability, TTL I/O compatibility, and industrial temperature range (–40°C to +85°C) compliance.
Technical Context
The SST39SF040-55-4I-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 operates in standard microprocessor bus interface mode with CE#, OE#, and WE# control signals, supporting byte-program, sector-erase, and chip-erase via JEDEC-compliant six-byte software command sequences.
It features dual end-of-write detection (Data# Polling on DQ7 and Toggle Bit on DQ6), hardware noise/glitch protection (<5 ns pulse rejection), VDD power-up/down write inhibition, and both hardware and software data protection. Address decoding supports up to A18 (512K × 8 = 4 Mbit), with AMS = A18 confirmed for this variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512K × 8), directly maps to 512 KB of contiguous address space for firmware or configuration storage |
| Read Access Time | 55 ns - enables direct connection to 14 MHz system buses without wait states |
| Supply Voltage | 4.5–5.5V - compatible with legacy 5V logic systems and tolerant of rail droop during power transitions |
| Endurance | 100,000 program/erase cycles - supports field firmware updates over full product lifecycle |
| Data Retention | Greater than 100 years - ensures long-term integrity of boot code and calibration data without refresh |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded applications including motor drives and PLCs |
| Package | 32-lead TSOP (8 mm × 14 mm) - surface-mount footprint optimized for high-density PCB layouts |
Pinout & Package
32-lead TSOP (8 mm × 14 mm) package with standard JEDEC x8 flash pinout; RoHS compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus supporting full 512K × 8 addressing; A17 is AMS (most significant address) |
| DQ0–DQ7 | Data Input/Output | Bi-directional 8-bit data bus; outputs tri-state when CE# or OE# high; latched internally during write |
| CE# | Chip Enable | Active-low device select; must be low for read/write operations; high-Z output when asserted high |
| OE# | Output Enable | Active-low output gate; controls data bus drive only; does not affect internal state or power mode |
| WE# | Write Enable | Active-low write control; initiates byte-program, sector-erase, or chip-erase upon rising edge sequence |
| VDD | Power Supply | 4.5–5.5V main supply; powers core logic and charge pumps; internal VPP generation eliminates external high-voltage source |
| VSS | Ground | Reference return path for all I/O and core circuitry; decoupling required per JEDEC layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| SuperFlash Technology | Split-gate cell with thick-oxide tunneling injector delivers fixed 18 ms sector-erase and 14 µs byte-program times across full endurance life |
| Uniform Sector Architecture | 128 sectors of 4 KByte each - enables granular firmware patching without erasing entire image |
| JEDEC-Compliant Command Set | Standardized 6-byte software sequences for sector-erase (30H), chip-erase (10H), and ID read (90H) ensure interoperability with existing flash drivers |
| Hardware + Software Data Protection | Glitch filtering (<5 ns), VDD lockout (<2.5V), and mandatory 3-/6-byte unlock sequences prevent accidental writes during power transients or reset |
| TTL I/O Compatibility | Direct interface with 5V microcontrollers and FPGAs without level-shifting; VIH = 2.0V min, VOL = 0.4V max at 2.1 mA |
Applications
| Industrial PLC Firmware Storage | Embedded Network Router Boot Code |
|---|---|
Use Scenario: Storing ladder logic programs and I/O mapping tables in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Nonvolatile code storage with guaranteed 100-year data retention and 100,000-cycle endurance for field firmware upgrades. Use Value: Eliminates need for battery-backed SRAM or EEPROM; reduces BOM cost and improves long-term reliability in unattended operation. | Use Scenario: Holding bootloader and kernel images in enterprise-grade network routers requiring secure, field-upgradable firmware. IC Role / Device Role / Timing Role: Primary boot memory mapped to CPU address space; accessed at 55 ns latency during cold start and warm reboot. Use Value: Enables fast boot times and atomic firmware updates via sector-erase-critical for zero-downtime network maintenance. |
| Medical Device Configuration Memory | Automotive Body Control Module (BCM) Calibration Data |
Use Scenario: Retaining user-configurable parameters (e.g., alarm thresholds, display brightness) in portable diagnostic equipment. IC Role / Device Role / Timing Role: Parameter storage with software data protection and industrial temperature rating (–40°C to +85°C). Use Value: Ensures parameter persistence across power cycles and thermal cycling; meets IEC 60601-1 environmental requirements. | Use Scenario: Storing sensor calibration coefficients and actuator trim values in automotive BCMs subject to extended temperature exposure. IC Role / Device Role / Timing Role: NVM for mission-critical calibration data; accessed during startup before CAN communication initialization. Use Value: Guarantees >100-year data retention under hood temperatures; avoids recalibration service visits over vehicle lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT49BV040-55TI | 4 Mbit (512K × 8), 55 ns, 4.5–5.5V, but uses different command set and lacks SuperFlash endurance guarantee | Requires modified driver software; lower typical endurance (10,000 cycles vs. 100,000) | Select if legacy AT49BV driver reuse is prioritized over long-term field update cycles |
| MX29LV040CTC-55G | 4 Mbit, 55 ns, 3.0V core (with 5V I/O), different sector map (64 KByte uniform), no VPP generation | Requires external 12V for programming; incompatible sector-erase granularity for patch-based updates | Choose only if 3.3V system integration and external high-voltage supply are acceptable trade-offs |
Compared with AT49BV040-55TI and MX29LV040CTC-55G, the SST39SF040-55-4I-WHE provides superior endurance, fixed timing, and integrated VPP-making it optimal for applications requiring frequent in-field firmware updates without hardware redesign.
Availability
SST39SF040-55-4I-WHE is available at Aetrix Electronics and suitable for industrial PLC firmware storage, embedded network router boot code, and medical device configuration memory requiring stable component supply and long-lifecycle support.
Supply support for SST39SF040-55-4I-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 leading provider of microcontroller, analog, FPGA, and memory solutions, delivering scalable, secure, and energy-efficient semiconductor products for industrial, automotive, and communications markets.
The SST39SF040-55-4I-WHE belongs to Microchip's legacy SST SuperFlash family, designed specifically for cost-sensitive, high-reliability embedded systems requiring robust 5V flash memory with JEDEC compatibility and long-term data retention.
FAQ
What is the maximum operating frequency supported by SST39SF040-55-4I-WHE?
The SST39SF040-55-4I-WHE specifies a 55 ns read access time, which corresponds to a maximum sustained bus clock rate of approximately 14 MHz when interfaced with standard microprocessor timing. It does not contain an internal clock generator; timing is fully asynchronous and governed by CE#, OE#, and WE# signal edges per JEDEC-compliant read cycles. The SST39SF040-55-4I-WHE datasheet confirms typical active current of 10 mA at 14 MHz.
Does SST39SF040-55-4I-WHE require an external high-voltage supply for programming?
No, the SST39SF040-55-4I-WHE integrates internal charge pump circuitry for VPP generation and operates entirely from a single 4.5–5.5V supply during both read and write operations. This eliminates the need for external 12V programming voltage sources, simplifying system design and reducing component count. All byte-program, sector-erase, and chip-erase functions execute using only the VDD rail - a key advantage of SST's SuperFlash technology implemented in the SST39SF040-55-4I-WHE.
How many address lines does SST39SF040-55-4I-WHE use, and what is the most significant address bit?
The SST39SF040-55-4I-WHE uses 18 address lines (A0–A17) to access its 512K × 8 organization. A17 is the most significant address (AMS), as confirmed in the datasheet's Pin Description table and timing diagrams. This distinguishes it from the SST39SF010A (A16 = AMS) and SST39SF020A (A17 = AMS), confirming full 4 Mbit addressing capability for the SST39SF040-55-4I-WHE.
What methods does SST39SF040-55-4I-WHE provide to detect completion of a write operation?
The SST39SF040-55-4I-WHE provides two hardware-supported software detection methods: Data# Polling (monitoring DQ7) and Toggle Bit (monitoring DQ6). During internal program or erase, DQ7 returns complemented data until completion, then true data; DQ6 toggles between 0 and 1 until completion, then stabilizes. Both are valid after the rising edge of the fourth (byte-program) or sixth (sector/chip-erase) WE# pulse. These mechanisms allow host processors to poll asynchronously without fixed delay loops - a core feature of the SST39SF040-55-4I-WHE.
Is SST39SF040-55-4I-WHE compatible with standard JEDEC x8 flash memory sockets and controllers?
Yes, the SST39SF040-55-4I-WHE conforms fully to JEDEC standard pinouts and command sets for x8 parallel flash memories. Its 32-pin TSOP footprint, signal naming (CE#, OE#, WE#), and 6-byte software command protocol (e.g., 5555H/2AAAH/A0H for program) ensure drop-in compatibility with existing JEDEC-compliant flash interfaces. The SST39SF040-55-4I-WHE datasheet explicitly states conformance to JEDEC pinouts and command definitions, enabling reuse of proven board layouts and firmware drivers.
SST39SF040-55-4I-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:
- 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-TSOP
SST39SF040-55-4I-WHE FAQ
1.How can I place an order for SST39SF040-55-4I-WHE through Aetrix?
Please submit a Request for Quotation (RFQ) for SST39SF040-55-4I-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 SST39SF040-55-4I-WHE reliable?
The price and inventory of SST39SF040-55-4I-WHE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SST39SF040-55-4I-WHE is usually 5 days.
3.What payment methods are accepted for SST39SF040-55-4I-WHE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST39SF040-55-4I-WHE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST39SF040-55-4I-WHE?
SST39SF040-55-4I-WHE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST39SF040-55-4I-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 SST39SF040-55-4I-WHE?
For technical support, including SST39SF040-55-4I-WHE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST39SF040-55-4I-WHE requirements.
6.How does Aetrix verify that SST39SF040-55-4I-WHE is sourced from the original manufacturer or authorized distributors?
All SST39SF040-55-4I-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 SST39SF040-55-4I-WHE meets industry standards.
7.What is the process for return or replacement of SST39SF040-55-4I-WHE?
All SST39SF040-55-4I-WHE units undergo pre-shipment inspection (PSI). If there is an issue with SST39SF040-55-4I-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 SST39SF040-55-4I-WHE part is unused and in its original packaging.
Return procedure for SST39SF040-55-4I-WHE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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