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Microchip Technology SST39SF040-55-4I-WHE-T
- Part No.:
- SST39SF040-55-4I-WHE-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
SST39SF040-55-4I-WHE-T.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,152
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Product details
Overview
SST39SF040-55-4I-WHE-T 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 split-gate technology for high reliability in embedded firmware storage applications requiring in-system reprogrammability.
For engineers reviewing the SST39SF040-55-4I-WHE-T datasheet, SST39SF040-55-4I-WHE-T pinout, SST39SF040-55-4I-WHE-T application, or SST39SF040-55-4I-WHE-T equivalent, this page delivers verified technical context, JEDEC-compliant x8 interface timing, industrial-grade (-40°C to +85°C) operation, and real-world flash endurance (100,000 cycles) and data retention (>100 years).
Technical Context
The SST39SF040-55-4I-WHE-T uses SST's proprietary SuperFlash technology with split-gate cells and thick-oxide tunneling injectors, enabling fixed erase/program times independent of cycle count. Its command-set architecture requires JEDEC-standard six-byte sequences for sector or chip erase and three-byte sequences for byte-program, all initiated via WE# or CE# control.
It supports TTL-compatible I/O, latched address/data buses, and dual end-of-write detection via Data# Polling (DQ7) and Toggle Bit (DQ6). Hardware protection includes noise/glitch immunity (<5 ns pulse rejection), VDD power-up/down detection (<2.5V inhibit), and write-inhibit modes via OE#, CE#, or WE# logic states.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512K × 8), directly maps to 512 KB of firmware or configuration storage |
| Read Access Time | 55 ns - enables direct execution from flash (XIP) in 14 MHz microcontroller systems |
| Supply Voltage | 4.5–5.5V - compatible with legacy 5V logic rails without level-shifting |
| Endurance | 100,000 program/erase cycles - supports field firmware updates over full product lifecycle |
| Data Retention | Greater than 100 years - ensures long-term reliability in unpowered storage |
| Operating Temperature | -40°C to +85°C - qualified for industrial environments including motor drives and PLCs |
| Byte-Program Time | 14 µs typical - reduces firmware patch latency during over-the-air updates |
Pinout & Package
Package: 32-lead TSOP (8 mm × 14 mm), RoHS-compliant, surface-mountable with standard JEDEC x8 pinout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | A0–A17 provide full 512K-word addressing; A12–A17 select 4 KByte sectors during erase |
| DQ0–DQ7 | Data I/O | Bidirectional 8-bit data bus; tri-stated when CE# or OE# is high; latched internally during writes |
| CE# | Chip Enable | Active-low chip select; device enters standby (30 µA) when high |
| OE# | Output Enable | Active-low output gate; controls data bus visibility without affecting internal state |
| WE# | Write Enable | Active-low write control; initiates byte-program, sector-erase, or chip-erase command sequences |
| VDD | Power Supply | 4.5–5.5V main supply; powers all internal logic and charge pumps |
| VSS | Ground | Reference return path for all signals and internal circuitry |
| NC | No Connection | Pins 16 and 31 are unconnected; must be left floating or tied to ground per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| SuperFlash Technology | Split-gate cell design delivers fixed 18 ms sector-erase and 70 ms chip-erase times across full lifetime |
| Software Data Protection | JEDEC-standard six-byte command sequence prevents accidental erase/program during power transitions |
| Hardware Write Inhibit | Automatic disable below 2.5V VDD and <5 ns glitch rejection eliminate spurious writes at power-up/down |
| End-of-Write Detection | DQ6 toggle bit and DQ7 data-polling enable deterministic host polling without fixed timeouts |
| Uniform Sector Architecture | 128 identical 4 KByte sectors simplify firmware partitioning and wear-leveling implementation |
Applications
| Industrial PLC Firmware Storage | Medical Device Configuration Memory |
|---|---|
Use Scenario: Storing ladder logic firmware and I/O mapping tables in programmable logic controllers deployed in factory automation. IC Role / Device Role / Timing Role: Nonvolatile code storage with direct bus interface; 55 ns read access supports real-time scan-cycle execution. Use Value: 100,000-cycle endurance enables quarterly firmware updates over 20+ year deployments without replacement. | Use Scenario: Holding calibration coefficients, user preferences, and safety-critical boot parameters in portable diagnostic equipment. IC Role / Device Role / Timing Role: Secure configuration register bank; hardware write-inhibit prevents corruption during battery swaps or brownouts. Use Value: >100-year data retention guarantees parameter integrity between recalibrations across device lifetime. |
| Automotive Body Control Module | Networking Equipment Bootloader Storage |
Use Scenario: Storing window/mirror/lock control logic and EEPROM-emulation data in automotive BCMs operating at -40°C to +85°C. IC Role / Device Role / Timing Role: Primary firmware image storage; 4.5–5.5V tolerance accommodates vehicle battery voltage fluctuations. Use Value: Industrial temperature rating and 55 ns access ensure deterministic boot timing under cold-cranking conditions. | Use Scenario: Hosting bootloader code and secure key partitions in enterprise switches and routers requiring remote firmware recovery. IC Role / Device Role / Timing Role: Dual-bank capable flash; sector-erase allows atomic bootloader updates without runtime interruption. Use Value: Uniform 4 KByte sectors enable precise partitioning of bootloader, crypto keys, and fallback images. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT49BV040A-55TI | 4 Mbit, 55 ns, 4.5–5.5V, but uses different command set and lacks Toggle Bit detection | Requires modified driver software; no hardware-assisted write-complete signaling | Select only if existing AT49BV firmware stack is reused and polling overhead is acceptable |
| MX29LV040CTT-55G | 4 Mbit, 55 ns, 3.0V core (with 5V I/O), lower active current (5 mA), but requires external VPP for programming | Needs charge pump support circuitry; incompatible with pure 5V-only systems | Prefer for low-power embedded designs where board space allows VPP generation |
Compared with AT49BV040A-55TI and MX29LV040CTT-55G, the SST39SF040-55-4I-WHE-T provides integrated VPP generation, deterministic Toggle Bit status, and JEDEC-standard command compatibility-reducing driver complexity and eliminating external components in 5V systems.
Availability
SST39SF040-55-4I-WHE-T is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device configuration memory, and automotive body control module applications requiring stable component supply and long-term obsolescence management.
Supply support for SST39SF040-55-4I-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 global semiconductor company specializing in microcontrollers, analog devices, and nonvolatile memory solutions for industrial, automotive, and consumer markets.
The SST39SF040-55-4I-WHE-T belongs to Microchip's legacy SuperFlash MPF family, designed specifically for cost-sensitive, 5V-based embedded systems needing reliable in-system programmability without external high-voltage circuitry.
FAQ
What is the maximum operating frequency supported by SST39SF040-55-4I-WHE-T?
The SST39SF040-55-4I-WHE-T does not operate at a clock frequency; it is an asynchronous parallel flash memory. Its 55 ns read access time corresponds to a maximum effective bus throughput of ~18.2 MHz in continuous read mode. System timing depends on CE#, OE#, and address setup/hold requirements defined in Table 11 of the datasheet, not an internal clock.
Does SST39SF040-55-4I-WHE-T require an external VPP voltage for programming?
No. The SST39SF040-55-4I-WHE-T integrates an internal charge pump and generates all required high-voltage programming signals internally. It operates with a single 4.5–5.5V supply for both read and write operations-no external VPP pin or circuitry is needed.
How many 4 KByte sectors does SST39SF040-55-4I-WHE-T contain?
The SST39SF040-55-4I-WHE-T contains 128 uniform 4 KByte sectors, totaling 512 KBytes (4 Mbit). Each sector can be erased independently using the JEDEC-standard six-byte sector-erase command, enabling granular firmware updates without disturbing adjacent code or data.
Is SST39SF040-55-4I-WHE-T compatible with standard x8 memory controllers?
Yes. The SST39SF040-55-4I-WHE-T conforms fully to JEDEC standard pinouts and command sets for x8 parallel flash memories. Its address, data, and control signals (CE#, OE#, WE#) match industry-standard timing and electrical behavior, ensuring drop-in compatibility with controllers designed for JEDEC-compliant 5V flash devices.
What is the purpose of the NC pins on SST39SF040-55-4I-WHE-T in the TSOP package?
The SST39SF040-55-4I-WHE-T TSOP package has two NC (No Connect) pins: Pin 16 and Pin 31. These pins are internally unconnected and must be left floating or tied to ground per PCB layout best practices. They serve no electrical function and are reserved for mechanical or future die revision flexibility.
SST39SF040-55-4I-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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-TSOP
SST39SF040-55-4I-WHE-T FAQ
1.How can I place an order for SST39SF040-55-4I-WHE-T through Aetrix?
Please submit a Request for Quotation (RFQ) for SST39SF040-55-4I-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 SST39SF040-55-4I-WHE-T reliable?
The price and inventory of SST39SF040-55-4I-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 SST39SF040-55-4I-WHE-T is usually 5 days.
3.What payment methods are accepted for SST39SF040-55-4I-WHE-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST39SF040-55-4I-WHE-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST39SF040-55-4I-WHE-T?
SST39SF040-55-4I-WHE-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST39SF040-55-4I-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 SST39SF040-55-4I-WHE-T?
For technical support, including SST39SF040-55-4I-WHE-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST39SF040-55-4I-WHE-T requirements.
6.How does Aetrix verify that SST39SF040-55-4I-WHE-T is sourced from the original manufacturer or authorized distributors?
All SST39SF040-55-4I-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 SST39SF040-55-4I-WHE-T meets industry standards.
7.What is the process for return or replacement of SST39SF040-55-4I-WHE-T?
All SST39SF040-55-4I-WHE-T units undergo pre-shipment inspection (PSI). If there is an issue with SST39SF040-55-4I-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 SST39SF040-55-4I-WHE-T part is unused and in its original packaging.
Return procedure for SST39SF040-55-4I-WHE-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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