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Microchip Technology SST39LF020-55-4C-WHE
- Part No.:
- SST39LF020-55-4C-WHE
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
SST39LF020-55-4C-WHE.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32VSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,034
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Product details
Overview
SST39LF020-55-4C-WHE from Microchip Technology (formerly Silicon Storage Technology) is a 2 Mbit (256K × 8) CMOS Multi-Purpose Flash memory IC with 55 ns read access time, single 3.0–3.6 V supply for both read and write operations, and uniform 4 KB sector-erase architecture. It is used in embedded systems for firmware storage, configuration retention, and boot code execution where reliable nonvolatile memory with fast byte-program capability is required.
For engineers reviewing the SST39LF020-55-4C-WHE datasheet, SST39LF020-55-4C-WHE pinout, SST39LF020-55-4C-WHE application, or SST39LF020-55-4C-WHE equivalent, key selection criteria include its JEDEC-standard x8 parallel interface, SuperFlash® technology-enabled 100,000-cycle endurance, 100-year data retention, and compatibility with legacy 32-pin PLCC or TSOP footprint designs.
Technical Context
The SST39LF020-55-4C-WHE implements SST's proprietary SuperFlash® technology with split-gate cell design and thick-oxide tunneling injector, delivering fixed erase/program timing independent of cycle count. It supports standard microprocessor bus interfacing via CE#, OE#, and WE# control signals and uses latched address/data inputs for synchronous operation.
Write operations require JEDEC-compliant three-byte (Byte-Program) or six-byte (Sector/Chip-Erase) software command sequences. End-of-write detection is implemented via Data# Polling (DQ7) and Toggle Bit (DQ6), enabling efficient polling-based host firmware integration without requiring external timing components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (256K × 8 organization), directly maps to 256 KB of contiguous byte-addressable storage space |
| Read Access Time | 55 ns - enables direct connection to 14 MHz system buses without wait states |
| Supply Voltage | 3.0–3.6 V - single-supply operation simplifies power design vs. dual-rail flash devices |
| Endurance | 100,000 program/erase cycles - supports field-upgradable firmware with long service life |
| Data Retention | Greater than 100 years - ensures configuration integrity across product lifetime without refresh |
| Sector Size | Uniform 4 KB sectors - allows granular firmware updates without erasing entire device |
| Byte-Program Time | 14 µs typical - enables rapid patching of individual memory locations during runtime |
Pinout & Package
Package: 32-lead PLCC (Plastic Leaded Chip Carrier) or 32-lead TSOP (8 mm × 14 mm); RoHS compliant; commercial temperature range (0°C to +70°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | A0–A16 used for 256K × 8 addressing; A17 selects upper 128K block - matches JEDEC x8 memory pinout |
| DQ0–DQ7 | Data Input/Output | Bi-directional 8-bit data bus; tri-state when CE# or OE# high - compatible with standard microprocessor data bus |
| CE# | Chip Enable | Active-low chip select; enables device for read/write - required low for all operations except standby |
| OE# | Output Enable | Active-low output gate; controls DQ bus drive - allows shared bus operation with other peripherals |
| WE# | Write Enable | Active-low write strobe - initiates latching of address/data and triggers internal program/erase logic |
| VDD | Power Supply | +3.0–3.6 V supply - powers core logic and charge pump; no external VPP required |
| VSS | Ground | Reference return path - must be low-impedance for stable read/write margins |
| NC | No Connection | Pins 12, 16, 24, 31 - unconnected; must remain floating per datasheet |
Key Features
| Feature | Design Value |
|---|---|
| SuperFlash® Technology | Split-gate cell with thick-oxide injector enables fixed 14 µs byte-program and 18 ms sector-erase times across full lifecycle |
| Hardware + Software Data Protection | Glitch immunity (<5 ns), VDD power-up/down detection, and mandatory 3-/6-byte command sequences prevent accidental writes |
| JEDEC-Compliant Interface | Standard x8 parallel pinout and command set - drop-in replacement for legacy 27Cxxx/28Fxxx EPROM/flash parts |
| Low Power Operation | 5 mA active current and 1 µA standby current - suitable for battery-backed or energy-constrained embedded systems |
| End-of-Write Detection | DQ6 Toggle Bit and DQ7 Data# Polling provide deterministic, software-driven completion signaling without external hardware |
Applications
| Industrial PLC Firmware Storage | Medical Device Configuration Memory |
|---|---|
|
Use Scenario: Storing programmable logic controller firmware images that require field updates via serial port or USB interface. IC Role / Device Role / Timing Role: Nonvolatile boot memory holding executable code and parameter tables; accessed at power-on reset and during firmware upgrade. Use Value: 55 ns read speed ensures zero-wait-state execution on 14 MHz MCUs; 100,000-cycle endurance supports >10 years of scheduled updates. |
Use Scenario: Retaining calibration coefficients, user preferences, and safety-critical settings in portable diagnostic equipment. IC Role / Device Role / Timing Role: Configuration EEPROM replacement providing guaranteed 100-year data retention without periodic refresh. Use Value: Single 3.3 V supply eliminates need for separate 5 V rail; 4 KB sector granularity allows safe reprogramming of calibration data without affecting operational firmware. |
| Automotive Infotainment Boot Loader | Networking Equipment BIOS Storage |
|
Use Scenario: Hosting primary boot loader code in automotive head units, loaded before initializing main SoC and display subsystems. IC Role / Device Role / Timing Role: First-stage boot memory mapped into CPU address space; read during cold start and wake-from-sleep sequences. Use Value: Commercial-grade 0°C to +70°C rating meets cabin ambient requirements; SuperFlash® reliability reduces risk of boot failure after thermal cycling. |
Use Scenario: Storing BIOS/UEFI firmware in enterprise switches and routers, updated remotely over management interfaces. IC Role / Device Role / Timing Role: System-level firmware repository accessed by host processor during POST and recovery mode. Use Value: Sector-erase capability enables atomic firmware updates; 2-second chip rewrite time minimizes service downtime during maintenance windows. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV040B-55EC | 4 Mbit (512K × 8), 55 ns access, 2.7–3.6 V supply, requires VPP = 12 V for programming | Higher density but higher voltage requirement; not pin-compatible due to different VPP pin assignment | Select if 4 Mbit capacity is needed and 12 V programming rail is available; verify PCB layout supports VPP routing |
| SST39VF020-70-4C-WHE | Same 2 Mbit density and package, but 70 ns access time and wider 2.7–3.6 V supply range; industrial temp option (-40°C to +85°C) | Lower performance (70 ns vs. 55 ns) but broader voltage/temp tolerance - suited for harsher environments | Select for extended temperature or lower-voltage operation; not suitable for 14 MHz bus timing-critical designs |
Compared with AM29LV040B-55EC and SST39VF020-70-4C-WHE, the SST39LF020-55-4C-WHE offers optimal balance of speed (55 ns), single-supply simplicity (3.0–3.6 V), and commercial-grade reliability for cost-sensitive embedded firmware storage - without requiring VPP or sacrificing timing margin.
Availability
SST39LF020-55-4C-WHE is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device configuration memory, automotive infotainment boot loaders, and networking equipment BIOS storage requiring stable component supply and long-term obsolescence support.
Supply support for SST39LF020-55-4C-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 acquired Silicon Storage Technology (SST) in 2016 and continues to manufacture and support the SuperFlash® family of parallel NOR flash memories.
The SST39LF020-55-4C-WHE belongs to the SST39LFxx0 series - designed specifically for cost-effective, single-supply firmware and configuration storage in resource-constrained embedded systems with legacy parallel bus interfaces.
FAQ
What is the operating voltage range for SST39LF020-55-4C-WHE?
The SST39LF020-55-4C-WHE operates from 3.0 V to 3.6 V for both read and write functions. This single-supply requirement eliminates the need for external VPP programming voltage, simplifying power design. The device is not rated for operation below 3.0 V or above 3.6 V - doing so may cause unreliable writes or data corruption. SST39LF020-55-4C-WHE is specified only for commercial temperature range (0°C to +70°C) under this voltage window.
Does SST39LF020-55-4C-WHE support sector erase, and what is the sector size?
Yes, SST39LF020-55-4C-WHE supports uniform sector-erase functionality with a fixed sector size of 4 KB. Each of the 64 sectors can be erased independently using a six-byte software command sequence. This granularity enables partial firmware updates without disturbing unrelated code or configuration data. SST39LF020-55-4C-WHE does not support block or page erase modes - only sector and full-chip erase are implemented.
How is write completion detected on SST39LF020-55-4C-WHE?
SST39LF020-55-4C-WHE provides two hardware-supported methods: Data# Polling (monitoring DQ7) and Toggle Bit (monitoring DQ6). After initiating a byte-program or erase command, the host reads DQ7/DQ6 repeatedly until DQ7 returns true data or DQ6 stops toggling. Both methods are valid after the fourth (for program) or sixth (for erase) WE# pulse. SST39LF020-55-4C-WHE requires no external status pins or timing delays for detection.
Is SST39LF020-55-4C-WHE pin-compatible with older EPROMs like 27C256?
No, SST39LF020-55-4C-WHE is not pin-compatible with 27C256. While both use 32-pin PLCC/TSOP packages and share similar address/data pin positions, SST39LF020-55-4C-WHE replaces OE and WE functions with active-low OE# and WE#, lacks VPP pin, and uses different control timing. Direct substitution requires PCB layout revision. SST39LF020-55-4C-WHE is JEDEC-compliant for x8 flash, not EPROM, and SST39LF020-55-4C-WHE datasheet defines exact signal timing relationships.
What is the data retention and endurance specification for SST39LF020-55-4C-WHE?
SST39LF020-55-4C-WHE guarantees greater than 100 years of data retention and 100,000 program/erase cycles under specified operating conditions (3.0–3.6 V, 0°C to +70°C). These values are measured per JEDEC standards A103 (retention) and A117 (endurance) and reflect typical performance of the SuperFlash® cell structure. SST39LF020-55-4C-WHE maintains these specs across its full rated lifetime without derating - unlike conventional flash, erase/program times do not increase with accumulated cycles.
SST39LF020-55-4C-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:
- 2Mbit
- Memory Organization:
- 256K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 20µs
- Access Time:
- 55 ns
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-VSOP
SST39LF020-55-4C-WHE FAQ
1.How can I place an order for SST39LF020-55-4C-WHE through Aetrix?
Please submit a Request for Quotation (RFQ) for SST39LF020-55-4C-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 SST39LF020-55-4C-WHE reliable?
The price and inventory of SST39LF020-55-4C-WHE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SST39LF020-55-4C-WHE is usually 5 days.
3.What payment methods are accepted for SST39LF020-55-4C-WHE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST39LF020-55-4C-WHE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST39LF020-55-4C-WHE?
SST39LF020-55-4C-WHE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST39LF020-55-4C-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 SST39LF020-55-4C-WHE?
For technical support, including SST39LF020-55-4C-WHE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST39LF020-55-4C-WHE requirements.
6.How does Aetrix verify that SST39LF020-55-4C-WHE is sourced from the original manufacturer or authorized distributors?
All SST39LF020-55-4C-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 SST39LF020-55-4C-WHE meets industry standards.
7.What is the process for return or replacement of SST39LF020-55-4C-WHE?
All SST39LF020-55-4C-WHE units undergo pre-shipment inspection (PSI). If there is an issue with SST39LF020-55-4C-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 SST39LF020-55-4C-WHE part is unused and in its original packaging.
Return procedure for SST39LF020-55-4C-WHE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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