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Microchip Technology SST39SF020A-55-4C-WHE-T
- Part No.:
- SST39SF020A-55-4C-WHE-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
SST39SF020A-55-4C-WHE-T.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,655
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Product details
Overview
SST39SF020A-55-4C-WHE-T from Microchip Technology is a 2 Mbit (256K × 8) CMOS Multi-Purpose Flash memory IC with 55 ns read access time, single 4.5–5.5 V supply operation, and uniform 4 KB sector-erase architecture. It implements SST's SuperFlash technology with split-gate cells, supports JEDEC-standard x8 pinout and command set, and is used for firmware storage in industrial controllers and legacy embedded systems requiring field-upgradable nonvolatile memory.
For engineers reviewing the SST39SF020A-55-4C-WHE-T datasheet, SST39SF020A-55-4C-WHE-T pinout, SST39SF020A-55-4C-WHE-T application, or SST39SF020A-55-4C-WHE-T equivalent, this page delivers verified technical context, JEDEC-compliant timing parameters, sector-erase behavior, SuperFlash reliability metrics (100,000 cycles, >100 years retention), and real-world design implications for 5 V microcontroller-based systems.
Technical Context
The SST39SF020A-55-4C-WHE-T uses SST's proprietary SuperFlash technology with split-gate cell structure and thick-oxide tunneling injector, enabling fixed erase/program times independent of cycle count-unlike conventional flash where timing degrades over endurance life. Its control logic accepts standard microprocessor write sequences to initiate byte-program, sector-erase, or chip-erase via JEDEC-compliant six-byte software command sequences.
It operates in three primary modes: Read (CE# and OE# low), Byte-Program (CE# low, WE# low, OE# high), and Sector/Chip-Erase (six-byte SDP sequence). End-of-write detection is implemented via Data# Polling (DQ7) and Toggle Bit (DQ6), both valid after the rising edge of the fourth (program) or sixth (erase) WE#/CE# pulse-enabling deterministic host polling without fixed delay loops.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (256K × 8) - provides sufficient space for boot code and configuration data in 8-bit microcontroller systems without external address multiplexing. |
| Read Access Time | 55 ns - enables direct interface with 14 MHz microcontrollers without wait states in standard 5 V bus environments. |
| Supply Voltage | 4.5–5.5 V - compatible with legacy 5 V TTL/CMOS logic families and eliminates need for dedicated programming voltage rails. |
| Endurance | 100,000 program/erase cycles - supports frequent firmware updates in field-deployed equipment such as PLCs and instrumentation. |
| Data Retention | >100 years - ensures long-term reliability in unpowered storage for industrial applications with extended product lifecycles. |
| Sector Size | Uniform 4 KB sectors - allows granular firmware patching without erasing full device, reducing update time and wear on unused sectors. |
| Write Detection | Data# Polling (DQ7) and Toggle Bit (DQ6) - provides host-software-controlled, timing-independent status checking during byte-program and sector-erase operations. |
Pinout & Package
Package: 32-lead PLCC (Plastic Leaded Chip Carrier), RoHS compliant, commercial temperature range (0°C to +70°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address Inputs | 17-bit address bus supporting 256K × 8 addressing; A16 is most significant address for SST39SF020A (vs. A17 for SST39SF040). |
| DQ0–DQ7 | Data Input/Output | 8-bit bidirectional data bus; outputs tri-state when CE# or OE# is high; latched internally during write cycles. |
| CE# | Chip Enable | Active-low chip select; device enters standby (30 µA) when high; required low for all write and read operations. |
| OE# | Output Enable | Active-low output gate; controls data bus drive; must be low for read access, high during program/erase. |
| WE# | Write Enable | Active-low write control; initiates internal program/erase timing upon rising edge; used with CE# for command sequencing. |
| VDD | Power Supply | +5 V supply (4.5–5.5 V); powers core logic and charge pumps; includes VDD power-up/down detection for write inhibition. |
| VSS | Ground | Reference ground for all I/O and core circuitry; decoupling capacitor placement critical for stable 55 ns read timing. |
| NC | No Connection | Pins 24 and 31 are unconnected; must remain floating per datasheet-no tie-high/tie-low or routing allowed. |
Key Features
| Feature | Design Value |
|---|---|
| SuperFlash Technology | Split-gate cell with thick-oxide tunneling injector enables fixed 14 µs byte-program and 18 ms sector-erase times across full endurance life-no software derating required. |
| JEDEC x8 Pinout & Command Set | Direct drop-in replacement for industry-standard 27C256 and 29F020 devices; eliminates PCB redesign when migrating from EPROM or earlier flash. |
| Hardware + Software Data Protection | Glitch protection (<5 ns pulses ignored), VDD lockout (<2.5 V inhibits writes), and mandatory 3-byte (program) or 6-byte (erase) SDP sequences prevent accidental corruption during power transitions. |
| Latched Address & Data | Internal latching on falling edge of CE# or WE# (whichever occurs last) simplifies interface with asynchronous microcontrollers lacking strict timing alignment. |
| Automatic VPP Generation | On-chip charge pump generates internal programming voltage-no external 12 V supply needed, reducing BOM count and board space. |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded Boot Memory |
|---|---|
Use Scenario: Storing and updating ladder logic firmware in programmable logic controllers operating in factory-floor environments with wide temperature swings and electrical noise. IC Role / Device Role / Timing Role: Nonvolatile boot memory mapped to microcontroller address space; accessed at power-on reset and during field firmware upgrades via RS-232 or CAN. Use Value: 100,000-cycle endurance supports quarterly firmware patches over 10+ years; 55 ns access avoids wait states with 8051 or Z80 derivatives commonly used in PLCs. |
Use Scenario: Replacing obsolete EPROMs (e.g., 27C256) in medical diagnostic instruments and test equipment where reprogramming in situ is required but socket space is constrained. IC Role / Device Role / Timing Role: Pin-compatible x8 parallel flash replacing UV-erasable EPROM; retains JEDEC-standard address/data/control pin mapping. Use Value: Eliminates UV eraser hardware and manual reprogramming logistics; 4 KB sector erase enables partial updates without full chip reflash. |
| Automotive Body Control Module | Point-of-Sale Terminal Configuration |
Use Scenario: Storing calibration tables and feature-enable bits in automotive BCMs where EEPROM wear-out limits have caused field failures. IC Role / Device Role / Timing Role: Secondary nonvolatile memory holding vehicle-specific settings; accessed only during ignition-on initialization or service-mode programming. Use Value: >100-year data retention ensures calibration integrity over full vehicle lifetime; 4.5–5.5 V operation tolerates battery voltage fluctuations during cranking. |
Use Scenario: Holding localized language packs, tax rate tables, and peripheral driver configurations in retail POS terminals deployed globally with regional variants. IC Role / Device Role / Timing Role: Field-upgradable configuration store; updated via USB-connected service tool using standard JEDEC command sequences. Use Value: Uniform 4 KB sectors allow region-specific updates without rewriting entire firmware image; RoHS compliance meets EU WEEE requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT29LV020-15PU | 3 V core (2.7–3.6 V), 150 ns access, 100K endurance, same 32-pin PDIP/PLCC footprint but different command set. | Requires level-shifting for 5 V systems; slower timing necessitates wait states with 14 MHz MCUs. | Select only if migrating to 3 V system architecture; not pin- or command-compatible with SST39SF020A-55-4C-WHE-T. |
| MX29LV020TCI-70G | 3 V supply (2.7–3.6 V), 70 ns access, 100K endurance, JEDEC-compatible command set but requires VPP = 12 V for programming. | Needs external high-voltage generator; incompatible with single-supply 5 V designs. | Use only when 3 V operation and external VPP are acceptable; no drop-in replacement capability. |
Compared with AT29LV020-15PU and MX29LV020TCI-70G, the SST39SF020A-55-4C-WHE-T uniquely delivers 5 V single-supply operation, 55 ns timing, and integrated VPP generation-making it the only viable direct replacement for legacy 5 V systems requiring zero hardware changes.
Availability
SST39SF020A-55-4C-WHE-T is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy embedded boot memory, and automotive body control module calibration storage requiring stable component supply and long-term lifecycle support.
Supply support for SST39SF020A-55-4C-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 SST39SF020A-55-4C-WHE-T belongs to Microchip's legacy SuperFlash MPF (Multi-Purpose Flash) product line, designed specifically for cost-sensitive, 5 V embedded systems needing reliable, field-upgradable firmware storage with JEDEC compatibility and simplified power architecture.
FAQ
What is the maximum operating frequency supported by SST39SF020A-55-4C-WHE-T?
The SST39SF020A-55-4C-WHE-T does not specify a maximum clock frequency because it is an asynchronous parallel flash memory. Its performance is defined by timing parameters-not clock speed-including 55 ns read cycle time (TRC), 40 ns minimum WE# pulse width (TWP), and 30 ns minimum CE# pulse width high (TCPH). These values enable reliable operation with 14 MHz microcontrollers without wait states.
Does SST39SF020A-55-4C-WHE-T require an external VPP voltage for programming?
No. The SST39SF020A-55-4C-WHE-T integrates an on-chip charge pump that generates the internal high voltage required for programming and erasing. It operates from a single 4.5–5.5 V supply-no external 12 V VPP connection is needed, simplifying board design and reducing component count compared to older flash devices.
How many address lines does SST39SF020A-55-4C-WHE-T use, and what is the significance of A16?
The SST39SF020A-55-4C-WHE-T uses 17 address lines (A0–A16) to access its 256K × 8 memory array. A16 is the most significant address bit for this density-distinct from SST39SF010A (A0–A15) and SST39SF040 (A0–A17). This mapping is critical for correct sector selection during erase operations and must match the host processor's address bus width.
Can SST39SF020A-55-4C-WHE-T be used as a direct replacement for 27C256 EPROMs?
Yes-the SST39SF020A-55-4C-WHE-T features JEDEC-standard x8 pinout and command compatibility, making it a functional and pin-compatible replacement for 27C256 EPROMs in 5 V systems. Unlike EPROMs, it supports in-system byte-programming and sector-erase without UV erasure or socket removal, significantly improving field serviceability.
What are the valid methods to detect completion of a program or erase operation on SST39SF020A-55-4C-WHE-T?
The SST39SF020A-55-4C-WHE-T provides two validated hardware-supported methods: Data# Polling (monitoring DQ7 for true data return) and Toggle Bit (monitoring DQ6 for cessation of toggling). Both become active after the rising edge of the fourth (byte-program) or sixth (sector/chip-erase) WE# or CE# pulse-enabling deterministic, timing-agnostic host polling without fixed delays.
SST39SF020A-55-4C-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:
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-TSOP
SST39SF020A-55-4C-WHE-T FAQ
1.How can I place an order for SST39SF020A-55-4C-WHE-T through Aetrix?
Please submit a Request for Quotation (RFQ) for SST39SF020A-55-4C-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 SST39SF020A-55-4C-WHE-T reliable?
The price and inventory of SST39SF020A-55-4C-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 SST39SF020A-55-4C-WHE-T is usually 5 days.
3.What payment methods are accepted for SST39SF020A-55-4C-WHE-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST39SF020A-55-4C-WHE-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST39SF020A-55-4C-WHE-T?
SST39SF020A-55-4C-WHE-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST39SF020A-55-4C-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 SST39SF020A-55-4C-WHE-T?
For technical support, including SST39SF020A-55-4C-WHE-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST39SF020A-55-4C-WHE-T requirements.
6.How does Aetrix verify that SST39SF020A-55-4C-WHE-T is sourced from the original manufacturer or authorized distributors?
All SST39SF020A-55-4C-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 SST39SF020A-55-4C-WHE-T meets industry standards.
7.What is the process for return or replacement of SST39SF020A-55-4C-WHE-T?
All SST39SF020A-55-4C-WHE-T units undergo pre-shipment inspection (PSI). If there is an issue with SST39SF020A-55-4C-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 SST39SF020A-55-4C-WHE-T part is unused and in its original packaging.
Return procedure for SST39SF020A-55-4C-WHE-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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