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Microchip Technology SST39VF040-70-4C-NHE
- Part No.:
- SST39VF040-70-4C-NHE
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
SST39VF040-70-4C-NHE.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:380
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Product details
Overview
SST39VF040-70-4C-NHE from Microchip Technology is a 4-Mbit (512K × 8) CMOS Multi-Purpose Flash memory IC with 2.7V–3.6V single-supply write operation, 70 ns read access time, and uniform 4-Kbyte sector erase architecture. It delivers 100,000 program/erase cycles and >100 years data retention for embedded firmware storage in industrial controllers and legacy system upgrades.
For engineers reviewing the SST39VF040-70-4C-NHE datasheet, SST39VF040-70-4C-NHE pinout, SST39VF040-70-4C-NHE application, or SST39VF040-70-4C-NHE equivalent, key selection criteria include its 32-pin PLCC/TSOP package compatibility, JEDEC-standard x8 command set, SuperFlash® low-energy erase/program timing, and industrial temperature support (–40°C to +85°C).
Technical Context
This device implements Microchip's proprietary SuperFlash® split-gate cell technology, enabling fixed erase and program times independent of accumulated cycling-unlike conventional flash-eliminating software derating over lifetime. Its control logic supports both WE#- and CE#-controlled byte programming and sector/chip erase via six-byte JEDEC-compliant command sequences.
Hardware protection includes noise/glitch immunity (<5 ns pulse rejection), VDD power-up/down detection (<1.5V inhibit), and write-inhibit mode (OE# low, CE# high, or WE# high). Software Data Protection (SDP) is factory-enabled and requires three-byte unlock for programming and six-byte unlock for erasure, ensuring robust inadvertent-write prevention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512K × 8), directly replaces EPROMs and older parallel NOR flash in boot code storage. |
| Read Access Time | 70 ns max - enables direct CPU interface without wait states on 14 MHz bus systems. |
| Write Voltage Range | 2.7V–3.6V - supports wider supply tolerance than 3.0V-only SST39LF variants, easing design in mixed-voltage boards. |
| Endurance | 10,000 min / 100,000 typ cycles - qualified per JEDEC A117, sufficient for field firmware updates over product lifetime. |
| Data Retention | 100 years min - meets long-lifecycle requirements for industrial and infrastructure equipment. |
| Operating Temp | –40°C to +85°C (industrial grade) - validated across full range, not just commercial 0°C–70°C. |
| Active Current | 20 mA max at 70 ns read - low enough for battery-backed or energy-constrained host systems. |
| Standby Current | 15 µA max - enables ultra-low-power sleep modes in always-on embedded applications. |
Pinout & Package
Available in 32-lead PLCC and 32-lead TSOP packages; both share identical pinout per JEDEC standard for x8 parallel flash. Pin 1 is NC for SST39VF040; AMS = A18 (most significant address line); no external VPP required due to internal charge pump.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | A0–A17 select 512K bytes; A18 (AMS) is tied internally for SST39VF040 - no external connection needed. |
| DQ0–DQ7 | Data I/O | Bi-directional 8-bit data bus; latched during write; tri-stated when CE# or OE# high. |
| CE# | Chip Enable | Active-low chip select; must be low for all operations except standby; enables multi-device decoding. |
| OE# | Output Enable | Active-low output gate; controls data bus drive during read; high = high-Z regardless of CE# state. |
| WE# | Write Enable | Active-low write strobe; initiates byte program, sector erase, and chip erase when CE# also low. |
| VDD | Power Supply | 2.7V–3.6V single supply; powers core logic and internal VPP generator for erase/program. |
| VSS | Ground | Reference return for all signals and power; requires low-impedance PCB plane for noise immunity. |
| NC | No Connection | Pins 1 and 30 are unconnected on SST39VF040 - must remain floating, not tied to VDD/VSS. |
Key Features
| Feature | Design Value |
|---|---|
| SuperFlash® Technology | Fixed 18 ms sector erase and 70 ms chip erase times - eliminates runtime degradation and simplifies firmware timing logic. |
| Uniform 4-Kbyte Sectors | 128 independent sectors enable granular firmware partitioning (e.g., bootloader, app, config) without full-chip erasure. |
| Toggle Bit & Data# Polling | DQ6 toggles / DQ7 complements during write - allows non-blocking status checks without dedicated interrupt lines. |
| JEDEC-Compliant Command Set | Standard 5555H/2AAAH unlock sequence ensures drop-in compatibility with existing flash drivers and BIOS implementations. |
| Hardware + Software Protection | Glitch filtering, VDD monitoring, and factory-enabled SDP prevent corruption during brown-out, reset, or ESD events. |
Applications
| Industrial PLC Firmware Storage | Legacy PC BIOS Replacement |
|---|---|
Use Scenario: Storing ladder logic and configuration data in programmable logic controllers deployed in factory automation environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Nonvolatile boot memory holding firmware executed directly by microcontroller upon power-up; accessed via parallel address/data bus. Use Value: Industrial temperature rating (–40°C to +85°C) and 100-year data retention ensure reliable operation over 15+ year equipment lifecycles without refresh. | Use Scenario: Replacing obsolete 27C040 EPROMs in legacy desktop/server motherboards requiring in-system reprogramming capability. IC Role / Device Role / Timing Role: Parallel NOR flash mapped into CPU memory space as boot ROM; supports standard BIOS update utilities via ISA/LPC interface. Use Value: 70 ns read access matches original EPROM timing, eliminating wait-state insertion; JEDEC pinout ensures socket compatibility. |
| Medical Device Configuration Memory | Telecom Line Card Bootloader |
Use Scenario: Holding calibration tables, user preferences, and safety-critical operational parameters in portable diagnostic equipment subject to regulatory audit. IC Role / Device Role / Timing Role: Secure, write-protected configuration store accessed only during initialization or authorized service mode. Use Value: Factory-enabled Software Data Protection and hardware write-inhibit prevent unauthorized modification - supporting FDA 21 CFR Part 11 compliance. | Use Scenario: Storing boot firmware and FPGA configuration bitstreams on carrier-grade DSLAM and ONU line cards requiring field-upgradable functionality. IC Role / Device Role / Timing Role: Primary boot device for PowerPC or ARM-based control processors; supports remote firmware updates over management interfaces. Use Value: Sector-erase granularity allows updating bootloader independently of application firmware, minimizing downtime during maintenance windows. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar parallel NOR flash applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF040-70-4I-NHE | Same density, timing, and features but rated for industrial temp (–40°C to +85°C) with tighter AC parameter guarantees. | Identical use cases; preferred where extended temperature validation or AEC-Q200 alignment is required. | Select SST39VF040-70-4I-NHE when full industrial-grade characterization (e.g., TSE ≤25 ms, TSCE ≤100 ms) is mandatory. |
| MX29LV400CTTI-70G | 4-Mbit, 70 ns, 3.0V–3.6V; uses different command set (AMD-style), no SuperFlash®; higher typical active current (25 mA). | Requires driver modification; lacks Toggle Bit/DQ7 polling; less suitable for low-power or legacy BIOS drop-in. | Choose MX29LV400CTTI-70G only if existing firmware already supports AMD command protocol and power budget allows. |
Compared with SST39VF040-70-4C-NHE, the -4I-NHE variant offers enhanced industrial qualification while the MX29LV400CTTI-70G requires firmware adaptation and consumes more energy during erase/program - making SST39VF040-70-4C-NHE optimal for cost-sensitive, drop-in EPROM replacements with moderate environmental demands.
Availability
SST39VF040-70-4C-NHE is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy PC BIOS replacement, and medical device configuration memory requiring stable component supply and long-term obsolescence management.
Supply support for SST39VF040-70-4C-NHE 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 Inc. is a global semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with emphasis on reliability, longevity, and embedded system integration.
The SST39VF series belongs to Microchip's Multi-Purpose Flash (MPF) product line, designed specifically for cost-effective, pin-compatible replacement of EPROMs and legacy parallel NOR flash in industrial, telecom, and computing applications.
FAQ
What is the memory organization of the SST39VF040-70-4C-NHE?
The SST39VF040-70-4C-NHE is organized as 512K × 8 bits (4 Mbit total), providing 524,288 addressable bytes. This structure matches standard x8 parallel bus interfaces and enables direct substitution for 27C040 EPROMs. The device uses A0–A17 for addressing, with A18 (AMS) handled internally - no external A18 pin is present. SST39VF040-70-4C-NHE supports uniform 4-Kbyte sectors (128 total), allowing selective erasure without affecting other memory regions.
Does the SST39VF040-70-4C-NHE require an external VPP voltage for programming?
No, the SST39VF040-70-4C-NHE does not require an external VPP voltage. It integrates an internal charge pump that generates the high voltage needed for erase and program operations from the single 2.7V–3.6V VDD supply. This eliminates the need for a separate 12V programming supply, simplifying board design and reducing component count. All write operations - including byte program, sector erase, and chip erase - are performed using only the main VDD rail. SST39VF040-70-4C-NHE maintains full functionality across its specified voltage and temperature ranges without auxiliary power sources.
What is the difference between SST39VF040-70-4C-NHE and SST39VF040-70-4I-NHE?
The SST39VF040-70-4C-NHE is rated for commercial temperature range (0°C to +70°C), while the SST39VF040-70-4I-NHE is fully qualified for industrial temperature operation (–40°C to +85°C) with tighter AC parameter limits and extended reliability testing. Both share identical pinout, command set, density, and timing (70 ns read), but the -4I-NHE variant undergoes additional screening for high-temperature endurance and data retention. SST39VF040-70-4C-NHE is appropriate for controlled-environment applications, whereas SST39VF040-70-4I-NHE is required for deployment in harsh thermal conditions.
How does the Software Data Protection (SDP) work on the SST39VF040-70-4C-NHE?
SST39VF040-70-4C-NHE ships with Software Data Protection permanently enabled. Byte programming requires a three-byte unlock sequence (5555H/AAH → 2AAAH/55H → 5555H/A0H), while sector or chip erase requires a six-byte sequence. Invalid commands abort the device back to read mode within TRC (read cycle time). This prevents accidental writes during power-up, reset, or noise events. SST39VF040-70-4C-NHE also includes hardware protections - such as <5 ns glitch rejection and VDD <1.5V write inhibition - forming a dual-layer safeguard against corruption.
Can the SST39VF040-70-4C-NHE be used as a direct replacement for the SST39LF040?
The SST39VF040-70-4C-NHE is not a direct replacement for the SST39LF040 due to differing voltage requirements: SST39LF040 requires 3.0V–3.6V for both read and write, while SST39VF040-70-4C-NHE operates at 2.7V–3.6V for write and supports the same 3.0V–3.6V read range. Although pinout and command set are identical, the lower 2.7V write threshold of SST39VF040-70-4C-NHE may cause unintended writes if the host system cannot guarantee clean 3.0V minimum during programming. SST39VF040-70-4C-NHE is best suited for new designs or systems where supply margin supports the wider voltage window.
SST39VF040-70-4C-NHE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- SST39 MPF™
- Package/Case:
- 32-LCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- 2.7V ~ 3.6V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (11.43x13.97)
SST39VF040-70-4C-NHE FAQ
1.How can I place an order for SST39VF040-70-4C-NHE through Aetrix?
Please submit a Request for Quotation (RFQ) for SST39VF040-70-4C-NHE 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 SST39VF040-70-4C-NHE reliable?
The price and inventory of SST39VF040-70-4C-NHE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SST39VF040-70-4C-NHE is usually 5 days.
3.What payment methods are accepted for SST39VF040-70-4C-NHE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST39VF040-70-4C-NHE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST39VF040-70-4C-NHE?
SST39VF040-70-4C-NHE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST39VF040-70-4C-NHE 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 SST39VF040-70-4C-NHE?
For technical support, including SST39VF040-70-4C-NHE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST39VF040-70-4C-NHE requirements.
6.How does Aetrix verify that SST39VF040-70-4C-NHE is sourced from the original manufacturer or authorized distributors?
All SST39VF040-70-4C-NHE 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 SST39VF040-70-4C-NHE meets industry standards.
7.What is the process for return or replacement of SST39VF040-70-4C-NHE?
All SST39VF040-70-4C-NHE units undergo pre-shipment inspection (PSI). If there is an issue with SST39VF040-70-4C-NHE, 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 SST39VF040-70-4C-NHE part is unused and in its original packaging.
Return procedure for SST39VF040-70-4C-NHE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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