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Microchip Technology SST39SF040-70-4I-WHE
- Part No.:
- SST39SF040-70-4I-WHE
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
SST39SF040-70-4I-WHE.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,698
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Product details
Overview
SST39SF040-70-4I-WHE from Microchip Technology is a 4 Mbit (512K × 8) parallel-interface Multi-Purpose Flash memory IC with 70 ns read access time, single 4.5–5.5 V supply operation, and uniform 4 KB sector-erase architecture. It implements SuperFlash technology for high reliability, supports TTL I/O compatibility, and is used in embedded firmware storage, BIOS/UEFI code retention, and industrial controller configuration memory.
For engineers reviewing the SST39SF040-70-4I-WHE datasheet, SST39SF040-70-4I-WHE pinout, SST39SF040-70-4I-WHE application, or SST39SF040-70-4I-WHE equivalent, key selection criteria include JEDEC-standard x8 pinout compliance, 100,000-cycle endurance, 100-year data retention, sector-erase timing (18 ms typ), and industrial temperature range (–40°C to +85°C).
Technical Context
The SST39SF040-70-4I-WHE uses SST's proprietary split-gate SuperFlash cell architecture with thick-oxide tunneling injector, enabling fixed erase/program times independent of cycle count. It operates in standard microprocessor bus environments with CE#, OE#, and WE# control signals and supports software data protection via six-byte command sequences for sector and chip erase.
It features dual end-of-write detection-Data# Polling (DQ7) and Toggle Bit (DQ6)-and latched address/data inputs. The device conforms to JEDEC standard pinouts and command sets for x8 flash memories, ensuring interoperability with legacy 8-bit memory controllers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512K × 8); supports full firmware image storage for mid-complexity microcontrollers. |
| Read Access Time | 70 ns max; enables direct execution from flash (XIP) in systems with ≤14 MHz bus clocks. |
| Supply Voltage | 4.5–5.5 V; compatible with legacy 5 V logic rails without level-shifting. |
| Endurance | 100,000 program/erase cycles; sufficient for field-updatable firmware with infrequent reprogramming. |
| Data Retention | >100 years at 25°C; ensures long-term reliability in unpowered storage applications. |
| Sector Size | Uniform 4 KB sectors; allows granular updates without erasing entire device (e.g., patching bootloader sections). |
| Operating Temp | –40°C to +85°C (Industrial grade); validated for use in factory automation and outdoor edge devices. |
Pinout & Package
Package: 32-lead TSOP (8 mm × 14 mm), RoHS-compliant, surface-mountable with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | A0–A16 select byte location; A17 selects upper/lower half of 512K array (AMS = A17 for SST39SF040). |
| DQ0–DQ7 | Data I/O | Bi-directional 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 DQ bus drive during read; high-Z when deasserted. |
| WE# | Write Enable | Active-low write strobe; initiates byte-program, sector-erase, and chip-erase command sequences. |
| VDD | Power Supply | 4.5–5.5 V core supply; includes internal VPP generation-no external high-voltage source needed. |
| VSS | Ground | Reference return for all signals and power; requires low-impedance PCB plane connection. |
| NC | No Connect | Pins 16 and 31 in TSOP package are unconnected; must be left floating or tied to ground per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| SuperFlash Technology | Split-gate cell with thick-oxide injector delivers stable 70 ns read timing and eliminates degradation-related timing drift over lifetime. |
| Software Data Protection | JEDEC-compliant 6-byte command sequence prevents accidental erase/write during power transitions or noise events. |
| Hardware Write Inhibit | Automatic lockout below 2.5 V VDD and <5 ns glitch rejection eliminate need for external reset supervisors in basic designs. |
| End-of-Write Detection | DQ6 toggle and DQ7 polling provide deterministic, software-driven completion signaling-no fixed timeout required. |
| TTL I/O Compatibility | Direct interface with 5 V microcontrollers (e.g., 8051, PIC18, legacy ARM7) without level translators or bus buffers. |
Applications
| Embedded Firmware Storage | Industrial PLC Configuration Memory |
|---|---|
Use Scenario: Storing boot code and application firmware for microcontroller-based edge nodes in smart metering systems. IC Role / Device Role / Timing Role: Nonvolatile code storage with XIP-capable 70 ns read access; directly mapped into CPU address space as ROM. Use Value: Eliminates external EEPROM or serial flash, reducing BOM count and enabling faster boot (<50 ms) due to parallel interface bandwidth. | Use Scenario: Retaining user-defined ladder logic parameters and calibration tables in programmable logic controllers deployed in factory environments. IC Role / Device Role / Timing Role: Field-updatable configuration store with sector-erase granularity; withstands thermal cycling and EMI per IEC 61000-4 standards. Use Value: Enables remote firmware patches via Modbus RTU without full device replacement-4 KB sectors allow updating only changed function blocks. |
| Legacy System BIOS/UEFI Retention | Medical Device Bootloader Storage |
Use Scenario: Holding BIOS initialization routines and hardware abstraction layer (HAL) code in industrial PCs and HMIs using Intel 440BX or similar chipsets. IC Role / Device Role / Timing Role: Pin-compatible replacement for older 28F-series flash; JEDEC x8 interface ensures drop-in compatibility with existing socketed designs. Use Value: Extends lifecycle of legacy platforms by providing RoHS-compliant, long-lifecycle (100+ year) alternative with identical timing and command set. | Use Scenario: Securing certified bootloader images in Class II medical instruments requiring traceable, tamper-resistant firmware storage. IC Role / Device Role / Timing Role: Secure boot root-of-trust element; leverages hardware write inhibit and software data protection to prevent unauthorized modification. Use Value: Meets IEC 62304 SW safety requirements through deterministic erase/write verification (DQ6/DQ7 polling) and 100,000-cycle endurance for audit logging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MX29LV040CTTI-70G | 4 Mbit, 70 ns, 3.0 V core (3.0–3.6 V), not 5 V compatible; different command set (AMD-style vs JEDEC). | Requires voltage translation and firmware adaptation; unsuitable for direct 5 V bus replacement. | Select only if migrating to 3.3 V system architecture and redesigning command-layer drivers. |
| EN29LV040A-70TP | 4 Mbit, 70 ns, 3.0 V core (2.7–3.6 V); JEDEC-compatible but lacks SuperFlash reliability metrics (endurance rated at 10,000 cycles). | Lower endurance limits field update frequency; not qualified for industrial temp range beyond +70°C. | Acceptable for cost-sensitive consumer products with infrequent updates, but not for industrial OEMs requiring 100,000-cycle guarantee. |
Compared with MX29LV040CTTI-70G and EN29LV040A-70TP, the SST39SF040-70-4I-WHE uniquely combines 5 V operation, JEDEC x8 pinout, 100,000-cycle endurance, and industrial temperature rating-making it the only drop-in solution for legacy 5 V embedded systems requiring long-term firmware stability.
Availability
SST39SF040-70-4I-WHE is available at Aetrix Electronics and suitable for embedded firmware storage, industrial PLC configuration memory, and legacy BIOS/UEFI retention requiring stable component supply across multi-year production cycles.
Supply support for SST39SF040-70-4I-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 U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and nonvolatile memory solutions for industrial, automotive, and communications markets.
The SST39SF040 belongs to Microchip's legacy SST SuperFlash family, designed specifically for cost-effective, high-reliability parallel flash replacement in 5 V embedded systems where pin compatibility, long data retention, and robust write protection are critical.
FAQ
What is the maximum operating temperature range for the SST39SF040-70-4I-WHE?
The SST39SF040-70-4I-WHE is rated for industrial temperature operation from –40°C to +85°C. This specification is validated per Table 5 in the official Microchip datasheet DS20005022C and applies to all DC and AC characteristics including read access time (70 ns), endurance (100,000 cycles), and data retention (>100 years). The "I" suffix in the part number explicitly denotes industrial grade.
Does the SST39SF040-70-4I-WHE require an external high-voltage supply for programming?
No, the SST39SF040-70-4I-WHE does not require an external high-voltage supply. It integrates internal VPP generation circuitry and performs all program and erase operations using only the standard 4.5–5.5 V VDD supply. This is confirmed in the "Features" section and "Device Operation" chapter of DS20005022C, eliminating need for charge pumps or external 12 V sources.
How many address lines does the SST39SF040-70-4I-WHE use, and what is the most significant address (AMS)?
The SST39SF040-70-4I-WHE uses 18 address lines (A0–A17). Per Table 1 and Figure 3 of DS20005022C, AMS = A17 for the SST39SF040 variant, enabling full addressing of its 512K × 8 organization. A17 is active during sector-erase operations to select the target 4 KB sector.
What are the valid methods to detect completion of a byte-program operation on the SST39SF040-70-4I-WHE?
The SST39SF040-70-4I-WHE supports two hardware-verified end-of-write detection methods: Data# Polling (monitoring DQ7) and Toggle Bit (monitoring DQ6). Both are enabled after the rising edge of the fourth WE# or CE# pulse and are specified in Tables 11–12 and Figures 8–9 of DS20005022C. Software must implement retry logic per the datasheet flowchart (Figure 17) to avoid spurious reads.
Is the SST39SF040-70-4I-WHE pin-compatible with the SST39SF020A or SST39SF010A?
Yes, the SST39SF040-70-4I-WHE shares identical pinout, signal definitions, and command set with the SST39SF020A and SST39SF010A across all packages (TSOP, PLCC, PDIP), as confirmed in Figures 2–4 and Table 1 of DS20005022C. Differences are internal (address depth: A17 vs A16/A15) and do not affect physical or electrical interface compatibility.
SST39SF040-70-4I-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:
- 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:
- 70 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
SST39SF040-70-4I-WHE FAQ
1.How can I place an order for SST39SF040-70-4I-WHE through Aetrix?
Please submit a Request for Quotation (RFQ) for SST39SF040-70-4I-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 SST39SF040-70-4I-WHE reliable?
The price and inventory of SST39SF040-70-4I-WHE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SST39SF040-70-4I-WHE is usually 5 days.
3.What payment methods are accepted for SST39SF040-70-4I-WHE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST39SF040-70-4I-WHE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST39SF040-70-4I-WHE?
SST39SF040-70-4I-WHE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST39SF040-70-4I-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 SST39SF040-70-4I-WHE?
For technical support, including SST39SF040-70-4I-WHE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST39SF040-70-4I-WHE requirements.
6.How does Aetrix verify that SST39SF040-70-4I-WHE is sourced from the original manufacturer or authorized distributors?
All SST39SF040-70-4I-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 SST39SF040-70-4I-WHE meets industry standards.
7.What is the process for return or replacement of SST39SF040-70-4I-WHE?
All SST39SF040-70-4I-WHE units undergo pre-shipment inspection (PSI). If there is an issue with SST39SF040-70-4I-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 SST39SF040-70-4I-WHE part is unused and in its original packaging.
Return procedure for SST39SF040-70-4I-WHE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SST39SF040-70-4I-WHE Tags
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