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Microchip Technology SST39LF020-55-4C-WHE-T
- Part No.:
- SST39LF020-55-4C-WHE-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
SST39LF020-55-4C-WHE-T.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32VSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,449
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Product details
Overview
SST39LF020-55-4C-WHE-T from Microchip Technology (formerly Silicon Storage Technology) is a 2 Mbit (256K × 8) CMOS Multi-Purpose Flash memory IC with single 3.0–3.6V supply operation, 55 ns read access time, and JEDEC-standard x8 parallel interface. It features uniform 4 KByte sector erase, 100,000 program/erase cycles endurance, and >100 years data retention - deployed in embedded firmware storage for industrial controllers and legacy BIOS modules.
For engineers reviewing the SST39LF020-55-4C-WHE-T datasheet, SST39LF020-55-4C-WHE-T pinout, SST39LF020-55-4C-WHE-T application, or SST39LF020-55-4C-WHE-T equivalent, key selection considerations include its 32-pin TSOP (8mm × 14mm) package, hardware/software write protection, toggle-bit and data# polling status detection, and compatibility with standard 8-bit microprocessor buses requiring fast byte-program (14 µs typical) and chip-erase (4 s typical).
Technical Context
This device implements SST's proprietary SuperFlash technology with split-gate cell architecture and thick-oxide tunneling injector, enabling fixed erase/program timing independent of cycle count - eliminating software de-rating over lifetime. It operates in standard Read, Byte-Program, Sector-Erase, Chip-Erase, and Software Product ID modes using JEDEC-compliant command sequences via CE#, OE#, and WE# control lines.
Address decoding supports AMS = A17 for SST39LF020, selecting sectors via A16–A12 and full array via A16–A0. Data I/O uses latched DQ7–DQ0 with tri-state outputs controlled by CE# and OE#, and internal VPP generation eliminates external high-voltage programming supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (256K × 8), directly maps to 256 KB of firmware or configuration space in 8-bit bus systems. |
| Read Access Time | 55 ns - enables direct execution (XIP) from flash at up to ~14 MHz bus clock without wait states. |
| Supply Voltage | 3.0–3.6V - compatible with 3.3V logic rails; no separate VPP required due to on-chip charge pump. |
| Endurance | 100,000 program/erase cycles - supports field firmware updates across product lifecycle in industrial equipment. |
| Data Retention | >100 years - ensures long-term reliability in unpowered storage for medical or infrastructure devices. |
| Standby Current | 1 µA typical - minimizes quiescent power in battery-backed or energy-sensitive applications. |
| Byte-Program Time | 14 µs typical - reduces firmware patch latency and enables real-time parameter updates. |
Pinout & Package
Package: 32-lead TSOP (8 mm × 14 mm), RoHS compliant, surface-mountable with standard reflow profile (260°C/10 s).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address Inputs | A16 is AMS (most significant address); selects sector (A16–A12) or byte (A16–A0) during operations. |
| DQ0–DQ7 | Data I/O | Bidirectional 8-bit bus; latched during writes, tri-stated when CE# or OE# is high. |
| CE# | Chip Enable | Active-low device select; disables all functions and reduces current to 1 µA when high. |
| OE# | Output Enable | Active-low output gate; controls data bus visibility without affecting internal state. |
| WE# | Write Enable | Active-low control for program/erase; initiates command latching on rising/falling edges per JEDEC sequence. |
| VDD | Power Supply | 3.0–3.6V main supply; powers core logic and internal VPP generator for erase/program. |
| VSS | Ground | Reference return path for all signals and power; requires low-impedance PCB connection. |
| NC | No Connection | Pins 12, 15, 24, 31 are unconnected - must be left floating or tied to ground per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| SuperFlash® Technology | Split-gate cells with thick-oxide injector deliver stable 55 ns read and 14 µs program times across full lifetime - no timing degradation with usage. |
| Uniform 4 KByte Sectors | Enables granular firmware updates (e.g., bootloader + application partitioning) without erasing entire memory - critical for fail-safe OTA upgrades. |
| Hardware + Software Data Protection | Glitch immunity (<5 ns), VDD lockout (<1.5V), and mandatory 3-byte/6-byte JEDEC command sequences prevent accidental writes during power transitions. |
| Status Detection | Toggle Bit (DQ6) and Data# Polling (DQ7) provide deterministic, software-driven completion signaling - eliminates need for fixed delay loops. |
| JEDEC x8 Standard Compliance | Pinout and command set match industry-standard parallel flash, enabling drop-in replacement in existing 8-bit microcontroller designs. |
Applications
| Industrial PLC Firmware Storage | Legacy PC BIOS/UEFI Module |
|---|---|
Use Scenario: Storing ladder logic programs and I/O configuration tables in programmable logic controllers operating in harsh factory environments (-40°C to +85°C). IC Role / Device Role / Timing Role: Nonvolatile code storage with direct bus interface; executes XIP during boot and supports field updates via serial service port. Use Value: 100,000-cycle endurance allows 10+ years of scheduled firmware revisions; 55 ns access enables real-time scan cycle timing compliance. | Use Scenario: Holding BIOS initialization routines and hardware abstraction layer in desktop motherboards using Intel 440BX or AMD-750 chipsets. IC Role / Device Role / Timing Role: Primary boot ROM mapped to 0xFFFF0000; accessed via ISA/LPC bus with strict tAA ≤ 55 ns requirement. Use Value: JEDEC x8 pinout ensures compatibility with legacy socketed BIOS sockets; 3.3V-only operation simplifies power design vs. 5V flash alternatives. |
| Medical Device Configuration Memory | Point-of-Sale Terminal Bootloader |
Use Scenario: Retaining calibration coefficients, user preferences, and safety-critical settings in FDA-cleared diagnostic imaging equipment. IC Role / Device Role / Timing Role: Secure configuration store with hardware write inhibit during power-up; accessed only during initialization or maintenance mode. Use Value: >100-year data retention meets IEC 62304 long-term archiving requirements; software ID commands (BFh/D6h) enable automated BOM verification. | Use Scenario: Hosting secure bootloader firmware in retail payment terminals that require FIPS 140-2 validated update mechanisms. IC Role / Device Role / Timing Role: First-stage boot code executed after POR; validates signature of main application before loading from external NAND. Use Value: Sector-erase capability isolates bootloader region from application updates; toggle-bit polling enables deterministic validation timing in security-critical paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar parallel flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV040B-55EC | 4 Mbit (512K × 8), 55 ns access, 3.0–3.6V, but uses AMD-style command set (not JEDEC) and lacks toggle-bit status. | Requires firmware driver rewrite; unsuitable where JEDEC compatibility or DQ6 polling is mandated. | Select only if migrating from existing AMD-based designs and full JEDEC compliance is not required. |
| SST39VF020-70-4C-WHE | Same density and pinout, but 2.7–3.6V supply range and 70 ns read access; lower voltage flexibility at cost of speed. | Acceptable in battery-powered or wide-temp industrial apps where 55 ns timing margin is unavailable. | Choose when system VDD may dip below 3.0V or extended temperature range (-40°C to +85°C) is needed. |
Compared with AM29LV040B-55EC and SST39VF020-70-4C-WHE, the SST39LF020-55-4C-WHE-T provides optimal balance of speed (55 ns), JEDEC compliance, and robust status feedback - making it preferred for legacy 8-bit microprocessor systems requiring guaranteed timing and field-upgrade reliability.
Availability
SST39LF020-55-4C-WHE-T is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy PC BIOS modules, medical device configuration memory, and point-of-sale terminal bootloaders requiring stable component supply and long-term obsolescence management.
Supply support for SST39LF020-55-4C-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 acquired Silicon Storage Technology (SST) in 2010 and continues to manufacture and support the SuperFlash family of parallel and serial NOR flash devices.
The SST39LF/VF series was designed specifically for cost-sensitive, high-reliability embedded systems requiring pin-compatible migration from EPROM and earlier flash technologies - emphasizing JEDEC compliance, low-power operation, and field-programmability without external VPP.
FAQ
What is the maximum operating frequency supported by SST39LF020-55-4C-WHE-T?
The SST39LF020-55-4C-WHE-T does not specify a maximum clock frequency, as it is an asynchronous parallel flash device. Its 55 ns read access time (tAA, tCE) implies reliable operation with bus cycles ≥55 ns - corresponding to a maximum effective throughput of ~18 MHz in zero-wait-state configurations. System timing must satisfy all AC parameters in Table 12, including TOE (30 ns) and TCHZ (15 ns).
Does SST39LF020-55-4C-WHE-T support both CE#-controlled and WE#-controlled write operations?
Yes, the SST39LF020-55-4C-WHE-T fully supports both CE#- and WE#-controlled programming and erase operations, as confirmed in Figures 5, 6, 9, and 10 of the datasheet. The device accepts identical command sequences regardless of which control line triggers latching, provided minimum pulse widths (TWP ≥ 40 ns, TCP ≥ 40 ns) and setup/hold times are met.
How is the device ID read from SST39LF020-55-4C-WHE-T?
To read the device ID from SST39LF020-55-4C-WHE-T, execute the Software ID Entry command sequence (5555H/AAH → 2AAAH/55H → 5555H/90H), then read address 0001H. The SST39LF020 returns D6H. Manufacturer ID BFH is read at address 0000H. Exit via 5555H/F0H or XXH/F0H to return to read mode.
What package type is used for SST39LF020-55-4C-WHE-T?
The SST39LF020-55-4C-WHE-T uses a 32-lead TSOP package measuring 8 mm × 14 mm (standard pinout, die-up orientation), as specified in Figure 3 and Table 1 of DS25023B. The "WHE" suffix explicitly denotes this TSOP variant; PLCC variants use "WH" or "WHA".
Can SST39LF020-55-4C-WHE-T be used in place of SST39LF010-55-4C-WHE-T?
No - while pin-compatible and electrically identical, the SST39LF020-55-4C-WHE-T (256K × 8) has double the memory capacity of the SST39LF010-55-4C-WHE-T (128K × 8). Address lines A17 and higher are unused in SST39LF010, but A17 is active in SST39LF020 (as AMS). Direct substitution may cause addressing errors unless firmware accounts for the expanded address space.
SST39LF020-55-4C-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 - NOR
- 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-TSOP
SST39LF020-55-4C-WHE-T FAQ
1.How can I place an order for SST39LF020-55-4C-WHE-T through Aetrix?
Please submit a Request for Quotation (RFQ) for SST39LF020-55-4C-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 SST39LF020-55-4C-WHE-T reliable?
The price and inventory of SST39LF020-55-4C-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 SST39LF020-55-4C-WHE-T is usually 5 days.
3.What payment methods are accepted for SST39LF020-55-4C-WHE-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST39LF020-55-4C-WHE-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST39LF020-55-4C-WHE-T?
SST39LF020-55-4C-WHE-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST39LF020-55-4C-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 SST39LF020-55-4C-WHE-T?
For technical support, including SST39LF020-55-4C-WHE-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST39LF020-55-4C-WHE-T requirements.
6.How does Aetrix verify that SST39LF020-55-4C-WHE-T is sourced from the original manufacturer or authorized distributors?
All SST39LF020-55-4C-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 SST39LF020-55-4C-WHE-T meets industry standards.
7.What is the process for return or replacement of SST39LF020-55-4C-WHE-T?
All SST39LF020-55-4C-WHE-T units undergo pre-shipment inspection (PSI). If there is an issue with SST39LF020-55-4C-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 SST39LF020-55-4C-WHE-T part is unused and in its original packaging.
Return procedure for SST39LF020-55-4C-WHE-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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