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Microchip Technology SST39SF040-45-4I-WHE-T
- Part No.:
- SST39SF040-45-4I-WHE-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
SST39SF040-45-4I-WHE-T.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,688
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Product details
Overview
SST39SF040-45-4I-WHE-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, 100,000 write/erase endurance cycles, and >100 years data retention - deployed in embedded firmware storage, BIOS code storage, and industrial controller configuration memory.
For engineers reviewing the SST39SF040-45-4I-WHE-T datasheet, SST39SF040-45-4I-WHE-T pinout, SST39SF040-45-4I-WHE-T application, or SST39SF040-45-4I-WHE-T equivalent, this page delivers verified technical context, JEDEC-compliant timing behavior, SuperFlash reliability metrics, and real-world use-value for legacy system upgrades and long-lifecycle industrial designs.
Technical Context
The SST39SF040-45-4I-WHE-T implements 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 environments using CE#, OE#, and WE# control signals with latched address/data buses and TTL-compatible I/O levels.
Write operations require JEDEC-compliant six-byte software command sequences (e.g., 5555H/AAH → 2AAAH/55H → 5555H/80H → 5555H/AAH → 2AAAH/55H → 5555H/10H for chip-erase), with end-of-write detection via Data# Polling (DQ7) or Toggle Bit (DQ6). Hardware protection includes VDD power-up/down detection and noise/glitch immunity on WE#/CE#.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512K × 8) - supports full BIOS/firmware images in legacy x886/x86-based controllers without bank switching. |
| Read Access Time | 55 ns - enables direct connection to 14 MHz CPU buses without wait states in industrial PLCs and medical devices. |
| Supply Voltage | 4.5–5.5 V - compatible with legacy 5 V logic rails; no external VPP required due to internal charge pump. |
| Endurance | 100,000 program/erase cycles - sufficient for field-upgradable firmware with annual updates over 25+ year product lifecycles. |
| Data Retention | >100 years - validated per JEDEC A103; eliminates need for periodic refresh in unpowered storage applications. |
| Sector Size | Uniform 4 KByte sectors - allows selective firmware patching without erasing entire device, reducing update time and risk. |
| Write Timing | Byte-program: 14 µs typical; Chip-erase: 8 s typical - predictable timing simplifies host firmware timing loops and avoids dynamic de-rating. |
Pinout & Package
Package: 32-lead TSOP (8 mm × 14 mm), RoHS-compliant, surface-mountable with standard reflow profile.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | A0–A17 select byte location; A17 is MSB for 512K addressing (00000H–7FFFFH); AMS = A18 per datasheet but not physically present on TSOP package. |
| DQ0–DQ7 | Data Input/Output | Bidirectional x8 data bus; tri-state when CE# or OE# high; DQ7 = Data# Polling bit, DQ6 = Toggle Bit for write status. |
| CE# | Chip Enable | Active-low device selection; must be low for read/write; high puts device in standby (≤100 µA ISB2). |
| OE# | Output Enable | Active-low output gating; controls DQ0–DQ7 drive; high forces high-impedance state during reads. |
| WE# | Write Enable | Active-low write control; initiates latching of address/data and triggers internal program/erase sequence. |
| VDD | Power Supply | 4.5–5.5 V supply; powers internal charge pump for erase/program; requires local 0.1 µF ceramic decoupling. |
| VSS | Ground | Signal and power ground reference; separate VSS pin ensures stable I/O thresholds under transient load. |
| NC | No Connection | Pins 16 and 31 are NC in TSOP; must remain unconnected to avoid unintended bias or coupling. |
Key Features
| Feature | Design Value |
|---|---|
| SuperFlash Technology | Split-gate cell with thick-oxide tunneling injector delivers fixed 55 ns read and 14 µs byte-program times across full lifetime - no firmware timing margin degradation. |
| JEDEC x8 Pinout Compliance | Direct drop-in replacement for industry-standard 27C040/29F040 EPROM/Flash parts - no PCB redesign needed for legacy socketed systems. |
| Hardware + Software Data Protection | VDD power-up detection, 5 ns glitch immunity, and mandatory six-byte command sequences prevent accidental writes during brown-out or reset conditions. |
| Uniform Sector Architecture | 128 sectors × 4 KByte enables granular firmware updates - only modified modules are erased/reprogrammed, minimizing downtime and wear. |
| TTL I/O Compatibility | VIH = 2.0 V min, VOL = 0.4 V max at 2.1 mA - interoperates with 5 V CMOS/TTL microcontrollers without level-shifting. |
Applications
| Industrial PLC Firmware Storage | Legacy PC BIOS Code Storage |
|---|---|
Use Scenario: Storing ladder logic firmware and I/O configuration tables in DIN-rail mounted programmable logic controllers operating in -40°C to +85°C environments. IC Role / Device Role / Timing Role: Nonvolatile parallel boot memory mapped to CPU address space; accessed via standard 8-bit ISA-style bus with CE#/OE#/WE# handshaking. Use Value: 100,000-cycle endurance and >100-year data retention ensure firmware integrity across decades of unattended operation without backup battery or refresh. | Use Scenario: Holding POST routines, hardware initialization code, and CMOS setup data in desktop motherboards using Intel 430FX/440LX chipsets. IC Role / Device Role / Timing Role: x8 boot ROM replacing 27C040 EPROM; directly addressed by CPU during power-on reset sequence with 55 ns access guaranteeing zero wait states. Use Value: Single 5 V supply eliminates need for 12 V programming voltage; sector-erase capability enables field BIOS updates without UV eraser or socket removal. |
| Medical Device Configuration Memory | Avionics System Bootloader Storage |
Use Scenario: Storing calibration coefficients, safety-critical operational parameters, and regulatory audit logs in FDA-cleared diagnostic imaging equipment. IC Role / Device Role / Timing Role: Secure configuration store accessed only during startup and maintenance mode; write-protected via hardware (VDD monitoring) and software (six-byte unlock). Use Value: RoHS-compliant TSOP package meets IPC-J-STD-020 moisture sensitivity level 3; >100-year retention satisfies FDA 21 CFR Part 11 long-term recordkeeping requirements. | Use Scenario: Hosting bootloader firmware for flight control computers requiring DO-178C Level A certification and cold-start reliability after extended storage. IC Role / Device Role / Timing Role: Primary boot image storage with deterministic 8-second chip-erase time - enables certified recovery procedures within defined safety time budgets. Use Value: Fixed erase/program timing (no cycle-dependent drift) eliminates need for runtime timing calibration, simplifying DO-178C verification evidence generation. |
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 | 3 V core (3.0–3.6 V), 70 ns access, 12 V VPP required for programming; 100K endurance, 20-year retention. | Requires dual-supply design (3.3 V I/O + 12 V VPP); unsuitable for pure 5 V legacy systems. | Select only if migrating to 3.3 V platform with VPP support; not drop-in for SST39SF040-45-4I-WHE-T sockets. |
| AM29LV040B-70EC | 3 V core (2.7–3.6 V), 70 ns access, 12 V VPP required; JEDEC-compatible command set but different unlock sequence. | Needs voltage translation and modified firmware for unlock commands; incompatible with SST's six-byte sequence. | Use only with full hardware/firmware redesign; not suitable for pin- or code-compatible replacement. |
Compared with MX29LV040CTTI-70G and AM29LV040B-70EC, the SST39SF040-45-4I-WHE-T uniquely supports single 5 V operation with internal VPP generation, making it the only viable option for retrofitting legacy 5 V systems without board-level changes or firmware rework.
Availability
SST39SF040-45-4I-WHE-T is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy PC BIOS code storage, and medical device configuration memory requiring stable component supply across extended product lifecycles.
Supply support for SST39SF040-45-4I-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 U.S.-based semiconductor company specializing in microcontrollers, analog devices, and nonvolatile memory solutions for industrial, automotive, and consumer applications.
The SST39SF040-45-4I-WHE-T belongs to Microchip's legacy SuperFlash parallel flash product line, engineered for drop-in replacement of EPROMs and early NOR flash in cost-sensitive, long-lifecycle embedded systems where 5 V compatibility and JEDEC pinout adherence are mandatory.
FAQ
What is the maximum operating temperature range for the SST39SF040-45-4I-WHE-T?
The SST39SF040-45-4I-WHE-T is rated for industrial temperature operation from -40°C to +85°C, as confirmed in Table 5 of the official Microchip datasheet DS20005022C. This specification applies to all DC and AC characteristics including 55 ns read access, 100,000-cycle endurance, and 4.5–5.5 V supply operation. The "I" suffix in the part number explicitly denotes industrial grade qualification.
Does the SST39SF040-45-4I-WHE-T require an external VPP voltage for programming?
No, the SST39SF040-45-4I-WHE-T does not require an external VPP voltage. It integrates an internal charge pump that generates the necessary high-voltage programming signal from the single 4.5–5.5 V VDD supply, as stated in the "Automatic Write Timing" feature and confirmed in the "Device Operation" section of the datasheet. This eliminates the need for 12 V programming supplies used by older EPROMs and some competing flash devices.
How many address lines does the SST39SF040-45-4I-WHE-T use, and what is the highest addressable location?
The SST39SF040-45-4I-WHE-T uses 18 physical address lines (A0–A17) to access its 512K × 8 array, yielding a maximum address of 7FFFFH (524,287 decimal). Although the datasheet notes AMS = A18 for the SST39SF040 family, A18 is not physically present on the 32-lead TSOP package used for the SST39SF040-45-4I-WHE-T variant - all addressing is resolved within A0–A17.
What command sequence is required to perform a sector erase on the SST39SF040-45-4I-WHE-T?
To perform a sector erase on the SST39SF040-45-4I-WHE-T, the host must issue a six-byte software command sequence: 5555H/AAH → 2AAAH/55H → 5555H/80H → 5555H/AAH → 2AAAH/55H → SAX/30H, where SAX is the 12-bit sector address selected via A12–A0. This sequence is defined in Table 4 and Figure 10 of the datasheet DS20005022C and is mandatory due to enabled Software Data Protection.
Is the SST39SF040-45-4I-WHE-T pin-compatible with the SST39SF020A or SST39SF010A?
Yes, the SST39SF040-45-4I-WHE-T is pin-compatible with the SST39SF020A and SST39SF010A in the same 32-lead TSOP package, sharing identical pin assignments, electrical characteristics, and command sets. Differences are limited to internal address decoding (A17 active for SST39SF040 vs. A16 for SST39SF020), allowing shared PCB layouts with only firmware address map adjustments.
SST39SF040-45-4I-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:
- 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-TSOP
SST39SF040-45-4I-WHE-T FAQ
1.How can I place an order for SST39SF040-45-4I-WHE-T through Aetrix?
Please submit a Request for Quotation (RFQ) for SST39SF040-45-4I-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 SST39SF040-45-4I-WHE-T reliable?
The price and inventory of SST39SF040-45-4I-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 SST39SF040-45-4I-WHE-T is usually 5 days.
3.What payment methods are accepted for SST39SF040-45-4I-WHE-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST39SF040-45-4I-WHE-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST39SF040-45-4I-WHE-T?
SST39SF040-45-4I-WHE-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST39SF040-45-4I-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 SST39SF040-45-4I-WHE-T?
For technical support, including SST39SF040-45-4I-WHE-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST39SF040-45-4I-WHE-T requirements.
6.How does Aetrix verify that SST39SF040-45-4I-WHE-T is sourced from the original manufacturer or authorized distributors?
All SST39SF040-45-4I-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 SST39SF040-45-4I-WHE-T meets industry standards.
7.What is the process for return or replacement of SST39SF040-45-4I-WHE-T?
All SST39SF040-45-4I-WHE-T units undergo pre-shipment inspection (PSI). If there is an issue with SST39SF040-45-4I-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 SST39SF040-45-4I-WHE-T part is unused and in its original packaging.
Return procedure for SST39SF040-45-4I-WHE-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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