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Microchip Technology SST39SF020A-55-4I-NHE
- Part No.:
- SST39SF020A-55-4I-NHE
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
SST39SF020A-55-4I-NHE.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:312
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Product details
Overview
SST39SF020A-55-4I-NHE from Microchip Technology is a 2-Mbit (256K × 8) CMOS Multi-Purpose Flash memory IC with 55 ns read access time, single 4.5V–5.5V supply operation, and uniform 4-Kbyte sector erase architecture. It implements SuperFlash® technology for high reliability and is used in embedded firmware storage, BIOS/UEFI code retention, and industrial controller configuration memory.
For engineers reviewing the SST39SF020A-55-4I-NHE datasheet, SST39SF020A-55-4I-NHE pinout, SST39SF020A-55-4I-NHE application, or SST39SF020A-55-4I-NHE equivalent, key selection criteria include JEDEC-standard x8 parallel interface compatibility, 100,000-cycle endurance, 100-year data retention, TTL I/O levels, and hardware/software write protection support.
Technical Context
This device belongs to Microchip's SST39SFxxxA family of parallel-interface flash memories using split-gate SuperFlash® technology. It features latched address/data buses, automatic internal VPP generation for programming, and supports Byte Program, Sector Erase (4 Kbyte), and Chip Erase operations via JEDEC-standard command sequences.
End-of-write detection is implemented via Data# Polling (DQ7) and Toggle Bit (DQ6), both valid after the fourth WE#/CE# pulse for program and sixth pulse for erase. The device operates across industrial temperature range (–40°C to +85°C) and conforms to RoHS compliance requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (256K × 8), enabling full firmware image storage for mid-complexity microcontrollers |
| Read Access Time | 55 ns - supports high-speed CPU bus interfacing without wait states at ≤18 MHz |
| Supply Voltage | 4.5V–5.5V - compatible with legacy 5V logic systems and eliminates need for external voltage regulators |
| Endurance | 100,000 program/erase cycles - sufficient for field firmware updates over 10+ years in industrial control applications |
| Data Retention | Greater than 100 years - ensures long-term reliability in unpowered storage scenarios (e.g., backup configuration) |
| Sector Size | Uniform 4-Kbyte sectors - enables granular firmware partitioning and safe over-the-air update rollback |
| Write Detection | Toggle Bit (DQ6) and Data# Polling (DQ7) - allows host CPU to poll asynchronously without dedicated interrupt lines |
Pinout & Package
32-lead TSOP (Thin Small Outline Package) with standard JEDEC x8 parallel flash pinout; pin-compatible with industry-standard 28-pin and 32-pin socket footprints for drop-in replacement in legacy designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address Inputs | 17-bit address bus supporting 256K-byte addressing; A16 is MSB for SST39SF020A |
| DQ0–DQ7 | Data Input/Output | 8-bit bidirectional data bus with tri-state outputs controlled by CE# and OE# |
| CE# | Chip Enable | Active-low chip select; deactivates device and places outputs in high-impedance state when high |
| OE# | Output Enable | Active-low output gate; controls data bus drive only during read cycles |
| WE# | Write Enable | Active-low control for all write operations (program/erase); initiates command latching on rising edge |
| VDD | Power Supply | 4.5V–5.5V main supply; powers internal charge pump for erase/program operations |
| VSS | Ground | Reference ground for all digital and analog circuitry; must be low-impedance connection |
| NC (Pin 1, Pin 30) | No Connection | Pin 1: NC for SST39SF020A; Pin 30: A17 (not NC) - critical for correct address decoding |
Key Features
| Feature | Design Value |
|---|---|
| SuperFlash® Technology | Fixed erase/program times independent of wear level - eliminates software derating and simplifies timing-critical firmware |
| Hardware Write Inhibit | Glitch protection (<5 ns), VDD power-up/down detection (<2.5V lockout), and tri-state control prevent accidental writes during power transitions |
| Software Data Protection (SDP) | JEDEC-standard 3-byte (program) and 6-byte (erase) command sequences - mandatory before any non-read operation |
| Low Power Standby | 30 µA typical standby current - reduces system-level quiescent power in always-on industrial equipment |
| TTL I/O Compatibility | VIH = 2.0V min, VIL = 0.8V max - interoperable with 5V CMOS/TTL microcontrollers without level-shifting |
Applications
| Firmware Storage | BIOS/UEFI Code Retention |
|---|---|
Use Scenario: Storing boot firmware for x86-based industrial PCs requiring cold-start reliability and field-upgradable code. IC Role / Device Role / Timing Role: Nonvolatile parallel flash memory mapped into CPU address space as boot ROM; accessed via 55 ns read cycle. Use Value: 100-year data retention ensures BIOS integrity across product lifetime without battery backup. |
Use Scenario: Holding UEFI firmware images in medical diagnostic equipment where regulatory validation requires immutable storage until deliberate update. IC Role / Device Role / Timing Role: Primary configuration memory with hardware/software write protection preventing corruption during power faults. Use Value: Sector-erase capability enables atomic firmware updates without erasing calibration data stored in adjacent sectors. |
| Industrial Controller Configuration | Legacy Embedded System Upgrade |
Use Scenario: Storing runtime parameters and calibration tables in PLCs operating in extended temperature environments (–40°C to +85°C). IC Role / Device Role / Timing Role: Configuration EEPROM replacement with faster write throughput (14 µs/byte) and higher endurance (100k cycles). Use Value: Uniform 4-Kbyte sectors allow isolated parameter updates without disturbing operational firmware partitions. |
Use Scenario: Drop-in replacement for obsolete 27C020 EPROMs in legacy telecom line cards requiring zero PCB redesign. IC Role / Device Role / Timing Role: Pin- and command-compatible flash memory with identical 32-lead TSOP footprint and JEDEC x8 interface. Use Value: Eliminates UV-eraser dependency and enables in-system reprogramming via existing board-level programming hardware. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar parallel flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV020B-55REI | 55 ns access, 2-Mbit, 3.0V core (with 5V I/O), no internal VPP generation - requires external 12V for programming | Requires additional voltage regulation and higher board complexity; lacks SuperFlash® fixed timing | Select only if 3.3V system integration is required and external VPP is acceptable |
| SST39VF200A-55-4I-B3K | Same density and timing, but 2.7V–3.6V supply range; uses different command set and lacks 5V tolerance | Not electrically compatible with 5V bus systems; incompatible with legacy 5V microcontrollers | Choose only for new 3.3V designs where lower power and smaller package (TSOP-48) are prioritized |
Compared with AM29LV020B-55REI and SST39VF200A-55-4I-B3K, the SST39SF020A-55-4I-NHE uniquely delivers 5V-only simplicity, internal VPP, fixed timing, and guaranteed 100k-cycle endurance - making it optimal for cost-sensitive, legacy 5V industrial upgrades.
Availability
SST39SF020A-55-4I-NHE is available at Aetrix Electronics and suitable for industrial controller configuration, BIOS/UEFI code storage, and legacy embedded system upgrades requiring stable component supply and long-term obsolescence management.
Supply support for SST39SF020A-55-4I-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 industrial, automotive, and aerospace reliability standards.
The SST39SFxxxA product line was designed specifically for pin-compatible, high-reliability replacement of EPROMs and earlier flash devices in 5V embedded systems requiring robust firmware storage and field upgradability.
FAQ
What is the maximum operating frequency supported by SST39SF020A-55-4I-NHE?
The SST39SF020A-55-4I-NHE does not operate at a clock frequency; it is an asynchronous parallel flash memory. Its 55 ns read access time supports CPU bus interfaces up to approximately 18 MHz without wait states. Write operations are command-driven and timing-controlled via WE#/CE# pulses per JEDEC specifications - no system clock is required for SST39SF020A-55-4I-NHE operation.
Does SST39SF020A-55-4I-NHE require external high voltage for programming?
No. The SST39SF020A-55-4I-NHE integrates an internal charge pump that generates the necessary high voltage (VPP) for erase and program operations from the standard 4.5V–5.5V VDD supply. This eliminates the need for external 12V programming supplies, simplifying system design and enabling in-system reprogramming - a core feature of the SST39SF020A-55-4I-NHE architecture.
How is write protection implemented on SST39SF020A-55-4I-NHE?
The SST39SF020A-55-4I-NHE implements dual-layer write protection: hardware-level inhibition (glitch filtering, VDD lockout below 2.5V, and tri-state control via OE#/CE#/WE#) and software-level protection via JEDEC-standard 3-byte (program) and 6-byte (erase) command sequences. Both layers must be satisfied before any non-read operation executes - ensuring robust immunity to noise, power transients, and accidental firmware corruption in the SST39SF020A-55-4I-NHE.
What package type is used for SST39SF020A-55-4I-NHE?
The SST39SF020A-55-4I-NHE is supplied in a 32-lead TSOP (Thin Small Outline Package) with standard JEDEC x8 parallel flash pinout. The "NHE" suffix explicitly denotes this TSOP packaging variant, which provides surface-mount compatibility, thermal performance suitable for industrial ambient temperatures, and mechanical interchangeability with other 32-pin flash devices - a key attribute of the SST39SF020A-55-4I-NHE.
Can SST39SF020A-55-4I-NHE be used as a direct replacement for 27C020 EPROMs?
Yes - the SST39SF020A-55-4I-NHE is designed as a functional and pin-compatible replacement for 27C020 EPROMs. It shares identical 32-lead TSOP packaging, 256K × 8 organization, and 5V operation. Unlike EPROMs, the SST39SF020A-55-4I-NHE supports in-system electrical erasure and programming without UV exposure, eliminating the need for EPROM programmers and erasers while maintaining full backward compatibility in legacy SST39SF020A-55-4I-NHE designs.
SST39SF020A-55-4I-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:
- 2Mbit
- Memory Organization:
- 256K 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-PLCC (11.43x13.97)
SST39SF020A-55-4I-NHE FAQ
1.How can I place an order for SST39SF020A-55-4I-NHE through Aetrix?
Please submit a Request for Quotation (RFQ) for SST39SF020A-55-4I-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 SST39SF020A-55-4I-NHE reliable?
The price and inventory of SST39SF020A-55-4I-NHE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SST39SF020A-55-4I-NHE is usually 5 days.
3.What payment methods are accepted for SST39SF020A-55-4I-NHE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST39SF020A-55-4I-NHE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST39SF020A-55-4I-NHE?
SST39SF020A-55-4I-NHE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST39SF020A-55-4I-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 SST39SF020A-55-4I-NHE?
For technical support, including SST39SF020A-55-4I-NHE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST39SF020A-55-4I-NHE requirements.
6.How does Aetrix verify that SST39SF020A-55-4I-NHE is sourced from the original manufacturer or authorized distributors?
All SST39SF020A-55-4I-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 SST39SF020A-55-4I-NHE meets industry standards.
7.What is the process for return or replacement of SST39SF020A-55-4I-NHE?
All SST39SF020A-55-4I-NHE units undergo pre-shipment inspection (PSI). If there is an issue with SST39SF020A-55-4I-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 SST39SF020A-55-4I-NHE part is unused and in its original packaging.
Return procedure for SST39SF020A-55-4I-NHE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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