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Microchip Technology SST39SF040-55-4C-WHE-T
- Part No.:
- SST39SF040-55-4C-WHE-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
SST39SF040-55-4C-WHE-T.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,678
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Product details
Overview
SST39SF040-55-4C-WHE-T from Microchip Technology is a 4 Mbit (512K × 8) parallel-interface CMOS Multi-Purpose Flash memory IC with 55 ns read access time, single 4.5–5.5 V supply operation, and uniform 4 KB sector-erase architecture. It implements SST's SuperFlash technology for high endurance and data retention, and is used in embedded firmware storage, BIOS/UEFI code storage, and industrial controller configuration memory.
For engineers reviewing the SST39SF040-55-4C-WHE-T datasheet, SST39SF040-55-4C-WHE-T pinout, SST39SF040-55-4C-WHE-T application, or SST39SF040-55-4C-WHE-T equivalent, key selection criteria include JEDEC-standard x8 pinout compatibility, 100,000-cycle endurance, 100-year data retention, sector-erase timing (18 ms typical), and 32-lead TSOP package footprint.
Technical Context
The SST39SF040-55-4C-WHE-T uses split-gate SuperFlash cell architecture with thick-oxide tunneling injector, enabling fixed erase/program times independent of cycle count-unlike floating-gate alternatives where timing degrades over endurance life. Its command set follows JEDEC-standard x8 flash protocols, requiring three-byte software unlock sequences for byte-program and six-byte sequences for sector/chip-erase.
It supports TTL-compatible I/O, latched address/data bus operation, and dual write-detection methods: Data# Polling (DQ7) and Toggle Bit (DQ6). The device operates across commercial temperature range (0°C to +70°C) and integrates hardware protections including VDD power-up/down detection and noise/glitch immunity on WE#/CE# inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512K × 8 bits); supports full firmware image storage for mid-complexity microcontrollers. |
| Read Access Time | 55 ns (max); enables direct execution from flash (XIP) in systems with ≤18 MHz bus timing budgets. |
| Endurance | 100,000 program/erase cycles (typical); sufficient for field-updatable firmware with annual revision cycles over 10+ years. |
| Data Retention | >100 years at 25°C; ensures long-term reliability in unpowered storage applications like medical device calibration tables. |
| Supply Voltage | 4.5–5.5 V; compatible with legacy 5 V logic systems without level-shifting circuitry. |
| Sector Size | Uniform 4 KB sectors; allows granular firmware partitioning (e.g., bootloader, app, config) without erasing entire device. |
| Write Detection | DQ6 Toggle Bit & DQ7 Data# Polling; eliminates need for external timers or status registers in host firmware. |
Pinout & Package
Package: 32-lead TSOP (8 mm × 14 mm), RoHS-compliant, surface-mount.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | A0–A16 select byte location; A17 selects upper/lower half of 512K array (SST39SF040 requires A17). |
| DQ0–DQ7 | Data Input/Output | Bidirectional 8-bit data bus; tri-stated when CE# or OE# is high; latched during write cycles. |
| CE# | Chip Enable | Active-low chip select; device enters standby (30 µA) when high; required low for all operations. |
| OE# | Output Enable | Active-low output gate; controls data bus drive during read; high = high-impedance state. |
| WE# | Write Enable | Active-low write control; initiates byte-program, sector-erase, and chip-erase command sequences. |
| VDD | Power Supply | 4.5–5.5 V supply; powers core logic and flash array; internal charge pump generates VPP for programming. |
| VSS | Ground | Reference ground for all signals and internal circuitry; must be low-impedance connection. |
| NC | No Connection | Pins 1, 16, 31, 32 are unconnected; must remain floating per datasheet Figure 3. |
Key Features
| Feature | Design Value |
|---|---|
| SuperFlash Technology | Split-gate cell with thick-oxide injector delivers stable 55 ns read timing and fixed 18 ms sector-erase time across full 100k-cycle life. |
| JEDEC x8 Standard Compliance | Pinout and command set match industry-standard parallel flash interfaces-enables drop-in replacement in existing 32-pin TSOP designs. |
| Hardware + Software Data Protection | VDD monitoring, 5 ns glitch rejection, and mandatory 3-/6-byte unlock sequences prevent accidental writes during power transitions. |
| Low Power Standby | 30 µA typical current draw in CE#-high mode-critical for battery-backed systems requiring infrequent firmware updates. |
| Byte-Program Speed | 14 µs typical (20 µs max); enables fast patching of individual configuration registers without full-sector erase overhead. |
Applications
| Firmware Storage in Industrial PLCs | BIOS/UEFI Code Storage in Embedded SBCs |
|---|---|
|
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 direct bus interface; executes XIP during boot and supports field updates via RS-485 or Ethernet. Use Value: 100,000-cycle endurance accommodates quarterly firmware patches; 4 KB sector granularity isolates bootloader from application updates. |
Use Scenario: Holding BIOS/UEFI firmware images in single-board computers used in kiosks, digital signage, and edge gateways. IC Role / Device Role / Timing Role: Primary boot memory mapped to CPU address space; accessed via 8-bit parallel bus with 55 ns timing compliance. Use Value: 55 ns read access meets Intel/AMD chipset timing requirements for fast POST; RoHS TSOP package supports automated reflow assembly. |
| Configuration Memory in Medical Devices | Firmware Update Storage in Telecom Edge Routers |
|
Use Scenario: Retaining calibration coefficients, safety thresholds, and user preferences in portable ultrasound and infusion pumps. IC Role / Device Role / Timing Role: Persistent parameter storage accessed only during initialization or service mode; powered from main 5 V rail. Use Value: >100-year data retention ensures calibration validity across product lifetime; hardware write inhibit prevents corruption during brown-out events. |
Use Scenario: Hosting downloadable firmware images for remote update in carrier-grade edge routers operating in telecom central offices. IC Role / Device Role / Timing Role: Secondary firmware repository accessed via dedicated microcontroller SPI-to-parallel bridge during maintenance windows. Use Value: Sector-erase capability enables atomic A/B firmware partitioning; 4.5–5.5 V tolerance matches telecom -48 V DC/DC converter outputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar parallel flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MX29LV040CTTI-70G | 4 Mbit, 70 ns access, 3.0 V core (with 5 V I/O), bottom-boot sector architecture | Requires voltage translation for pure 5 V systems; boot sector layout differs from uniform 4 KB sectors | Select if migrating to 3 V core systems or needing boot-sector protection; not pin-compatible due to different sector map. |
| AM29LV040B-55REI | 4 Mbit, 55 ns access, 3.0 V core (with 5 V I/O), 64 KB uniform sectors | Larger 64 KB sectors increase minimum erase granularity; higher active current (25 mA vs. 10 mA) | Choose for legacy AMD-compatible designs; verify sector alignment in firmware before substitution. |
Compared with MX29LV040CTTI-70G and AM29LV040B-55REI, the SST39SF040-55-4C-WHE-T offers finer 4 KB erase granularity, lower 10 mA active current, and true 5 V-only operation-making it optimal for cost-sensitive, power-constrained 5 V embedded systems requiring frequent small updates.
Availability
SST39SF040-55-4C-WHE-T is available at Aetrix Electronics and suitable for industrial PLC firmware storage, embedded SBC BIOS/UEFI hosting, and medical device configuration memory requiring stable component supply across multi-year production cycles.
Supply support for SST39SF040-55-4C-WHE-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 U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and nonvolatile memory solutions, with global manufacturing and quality certifications.
The SST39SF040 belongs to Microchip's legacy SST SuperFlash parallel flash product line, designed specifically for cost-effective, high-reliability firmware and configuration storage in 5 V industrial and embedded systems.
FAQ
What is the maximum operating temperature range for the SST39SF040-55-4C-WHE-T?
The SST39SF040-55-4C-WHE-T is rated for commercial temperature operation from 0°C to +70°C. It does not support extended industrial (-40°C to +85°C) or automotive temperature grades. This specification is confirmed in Table 5 of the official Microchip datasheet DS20005022C, and applies directly to the -4C suffix variant.
Does the SST39SF040-55-4C-WHE-T require an external VPP voltage for programming?
No, the SST39SF040-55-4C-WHE-T integrates an internal charge pump that generates the necessary high-voltage programming pulse (VPP) from the single 4.5–5.5 V VDD supply. This eliminates the need for external high-voltage circuitry and simplifies system design-confirmed in the "Automatic Write Timing" feature list and "Internal VPP Generation" section of the datasheet.
How many address lines does the SST39SF040-55-4C-WHE-T use, and why is A17 significant?
The SST39SF040-55-4C-WHE-T uses 18 address lines (A0–A17) to access its 512K × 8 memory space. A17 is the most significant address bit and is required to select the upper 256K bytes-distinguishing it from the 256K SST39SF020A (A0–A16) and 128K SST39SF010A (A0–A15). This is explicitly defined in Table 1 footnote and Figures 2–4.
Can the SST39SF040-55-4C-WHE-T be used in systems requiring JEDEC-standard command compatibility?
Yes, the SST39SF040-55-4C-WHE-T fully conforms to JEDEC standard pinouts and command sets for x8 flash memories, including mandatory three-byte unlock sequences for programming and six-byte sequences for erase operations. This enables interoperability with standard flash programmers and BIOS implementations documented in Table 4 and Section "JEDEC Standard".
What is the typical chip-erase time for the SST39SF040-55-4C-WHE-T, and how is completion detected?
The typical chip-erase time for the SST39SF040-55-4C-WHE-T is 70 ms, as stated in the Features section and confirmed in Table 12 (TSCE = 100 ms max). Completion is detected using either Data# Polling (DQ7 toggles to '1') or Toggle Bit (DQ6 stops toggling), both valid after the sixth WE# pulse rising edge-per Figure 11 and Section "Write Operation Status Detection".
SST39SF040-55-4C-WHE-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- SST39 MPF™
- Package/Case:
- 32-TFSOP (0.488", 12.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-TSOP
SST39SF040-55-4C-WHE-T FAQ
1.How can I place an order for SST39SF040-55-4C-WHE-T through Aetrix?
Please submit a Request for Quotation (RFQ) for SST39SF040-55-4C-WHE-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 SST39SF040-55-4C-WHE-T reliable?
The price and inventory of SST39SF040-55-4C-WHE-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SST39SF040-55-4C-WHE-T is usually 5 days.
3.What payment methods are accepted for SST39SF040-55-4C-WHE-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST39SF040-55-4C-WHE-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST39SF040-55-4C-WHE-T?
SST39SF040-55-4C-WHE-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST39SF040-55-4C-WHE-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 SST39SF040-55-4C-WHE-T?
For technical support, including SST39SF040-55-4C-WHE-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST39SF040-55-4C-WHE-T requirements.
6.How does Aetrix verify that SST39SF040-55-4C-WHE-T is sourced from the original manufacturer or authorized distributors?
All SST39SF040-55-4C-WHE-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 SST39SF040-55-4C-WHE-T meets industry standards.
7.What is the process for return or replacement of SST39SF040-55-4C-WHE-T?
All SST39SF040-55-4C-WHE-T units undergo pre-shipment inspection (PSI). If there is an issue with SST39SF040-55-4C-WHE-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 SST39SF040-55-4C-WHE-T part is unused and in its original packaging.
Return procedure for SST39SF040-55-4C-WHE-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SST39SF040-55-4C-WHE-T Tags
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