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Microchip Technology SST39LF020-45-4C-WHE
- Part No.:
- SST39LF020-45-4C-WHE
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
SST39LF020-45-4C-WHE.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,707
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Product details
Overview
SST39LF020-45-4C-WHE from Microchip Technology is a 2 Mbit (256K × 8) CMOS Multi-Purpose Flash memory IC with 45 ns read access time, single 3.0–3.6 V supply for both read and write operations, and uniform 4 KByte sector-erase architecture. It is used in embedded firmware storage, BIOS/UEFI code retention, and industrial controller configuration memory.
For engineers reviewing the SST39LF020-45-4C-WHE datasheet, SST39LF020-45-4C-WHE pinout, SST39LF020-45-4C-WHE application, or SST39LF020-45-4C-WHE equivalent, key selection criteria include JEDEC-standard x8 parallel interface compatibility, SuperFlash® endurance (100,000 program/erase cycles), 100-year data retention, 1 µA standby current, and support for Data# Polling and Toggle Bit write-status detection.
Technical Context
The SST39LF020-45-4C-WHE implements SST's proprietary SuperFlash® technology with split-gate cell design and thick-oxide tunneling injector, enabling fixed erase/program times independent of cycle count. It uses standard microprocessor bus timing with latched address/data and supports CE#/OE#/WE# control logic for read, byte-program, sector-erase, and chip-erase operations.
It conforms to JEDEC-standard x8 flash pinouts and command sets, requires no external VPP, and integrates on-chip hardware and software data protection-including noise/glitch immunity, VDD power-up/down detection, and mandatory three-byte (program) or six-byte (erase) Software Data Protection sequences.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (256K × 8), directly maps to 256 KB of contiguous firmware or configuration storage space |
| Read Access Time | 45 ns - enables direct execution from flash (XIP) in systems with ≤22 MHz bus clocks |
| Supply Voltage | 3.0–3.6 V - compatible with 3.3 V logic rails without level-shifting or auxiliary regulators |
| Endurance | 100,000 program/erase cycles - supports field firmware updates over full product lifecycle |
| Data Retention | >100 years at 25°C - ensures long-term reliability in unpowered storage applications |
| Standby Current | 1 µA typical - critical for battery-backed or energy-harvesting systems requiring ultra-low quiescent power |
| Write Detection | Toggle Bit (DQ6) and Data# Polling (DQ7) - enables deterministic, non-blocking host polling without timers or interrupts |
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 | A0–A16 select one of 256K bytes; A16 is MSB for 2 Mbit addressing (0x00000–0x3FFFF) |
| DQ0–DQ7 | Data Input/Output | Bi-directional 8-bit data bus; tri-stated when CE# or OE# is high |
| CE# | Chip Enable | Active-low device select; disables outputs and reduces current to 1 µA in standby |
| OE# | Output Enable | Active-low output gate; controls data bus visibility during read without deselecting chip |
| WE# | Write Enable | Active-low control for byte-program and erase command latching; initiates internal timing |
| VDD | Power Supply | 3.0–3.6 V core supply; powers all logic and SuperFlash® array operations |
| VSS | Ground | Reference return path for all I/O and internal circuitry |
Key Features
| Feature | Design Value |
|---|---|
| SuperFlash® Technology | Split-gate cell enables fixed 18 ms sector-erase and 70 ms chip-erase times across full lifetime - eliminates software de-rating |
| Uniform 4 KByte Sectors | 64 independent sectors allow granular firmware updates without erasing entire image - reduces update risk and time |
| Hardware + Software Data Protection | Prevents spurious writes during power transitions via VDD monitoring, 5 ns glitch rejection, and mandatory 3-/6-byte command sequences |
| JEDEC x8 Standard Compliance | Drop-in replacement for legacy parallel NOR flash in existing 8-bit bus designs - no PCB or firmware changes required |
| Low-Energy Programming | 20 µs byte-program and internal VPP generation reduce total energy per write vs. conventional flash - extends battery life |
Applications
| Industrial PLC Firmware Storage | Embedded BIOS/UEFI Code |
|---|---|
Use Scenario: Storing ladder logic, motion control algorithms, and calibration tables in programmable logic controllers operating in harsh factory environments. IC Role / Device Role / Timing Role: Nonvolatile code storage with XIP-capable 45 ns read timing and sector-level update capability for field-deployed firmware patches. Use Value: Enables secure, reliable firmware updates without full system reboot or external programming hardware - reducing downtime and service costs. | Use Scenario: Holding boot firmware, hardware initialization routines, and secure boot keys in server motherboards and edge computing platforms. IC Role / Device Role / Timing Role: Primary boot ROM with JEDEC-compliant interface, supporting fast cold-boot sequences and authenticated firmware loading. Use Value: Guarantees 100-year data retention and 100,000-cycle endurance - ensuring BIOS integrity across multi-decade infrastructure deployments. |
| Medical Device Configuration Memory | Automotive Body Control Module (BCM) |
Use Scenario: Retaining user-configurable parameters (e.g., alarm thresholds, display language, audit logs) in portable diagnostic equipment with battery backup. IC Role / Device Role / Timing Role: Low-power configuration store using 1 µA standby current and robust write-protection against power-loss corruption. Use Value: Prevents loss of critical clinical settings during unexpected power interruption - meeting IEC 62304 safety requirements. | Use Scenario: Storing lighting profiles, window position maps, and fault history in automotive BCMs exposed to wide temperature (-40°C to +85°C) and EMI stress. IC Role / Device Role / Timing Role: Industrial-grade flash with guaranteed operation across extended temp range and immunity to voltage transients on 12 V rail. Use Value: Eliminates need for external voltage supervisors or EEPROM co-location - simplifying BOM and layout while maintaining ASIL-B compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar parallel NOR flash applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MX29LV020TC-45G | 45 ns access, 2 Mbit, 2.7–3.6 V supply, supports CFI query but lacks Toggle Bit status detection | Requires polling loop timeout instead of deterministic DQ6 toggle - increases firmware complexity | Select when CFI compatibility or broader voltage margin is prioritized over real-time write-status feedback |
| EN29LV020-45T | 45 ns access, 2 Mbit, 3.0–3.6 V supply, identical sector size and JEDEC pinout, but 50,000-cycle endurance rating | Half the endurance of SST39LF020-45-4C-WHE - limits field update frequency in high-change-rate applications | Select for cost-sensitive designs where firmware revision frequency is low and long-term field updates are infrequent |
Compared with MX29LV020TC-45G and EN29LV020-45T, the SST39LF020-45-4C-WHE delivers superior write-status visibility via Toggle Bit, higher endurance for frequent field updates, and lower standby current - making it optimal for mission-critical embedded systems requiring deterministic, long-life firmware storage.
Availability
SST39LF020-45-4C-WHE is available at Aetrix Electronics and suitable for industrial PLC firmware storage, embedded BIOS/UEFI code, and medical device configuration memory requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.
Supply support for SST39LF020-45-4C-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 is a global semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with leadership in embedded control and secure connectivity.
The SST39LF020-45-4C-WHE belongs to Microchip's legacy SuperFlash® parallel NOR flash product line, designed specifically for cost-sensitive, high-reliability embedded systems requiring simple 8-bit bus interfacing and long-term data integrity without external high-voltage circuitry.
FAQ
What is the maximum operating temperature range for the SST39LF020-45-4C-WHE?
The SST39LF020-45-4C-WHE is rated for commercial operation from 0°C to +70°C. Its 3.0–3.6 V supply range and SuperFlash® architecture ensure stable performance across this range without derating. The part does not support industrial temperature grades (–40°C to +85°C); for those conditions, the SST39VF020 series is specified. SST39LF020-45-4C-WHE must be operated within its published ambient limits to guarantee 100,000-cycle endurance and >100-year data retention.
Does the SST39LF020-45-4C-WHE require an external VPP voltage for programming?
No, the SST39LF020-45-4C-WHE does not require an external VPP voltage. It generates all necessary high-voltage programming signals internally using its 3.0–3.6 V VDD supply. This eliminates the need for external charge pumps or high-voltage regulators, simplifying board design and reducing BOM cost. All byte-program and erase operations are executed autonomously after valid command sequences are latched - a key advantage of SST's SuperFlash® technology implemented in the SST39LF020-45-4C-WHE.
How many address pins does the SST39LF020-45-4C-WHE have, and what is the highest address line?
The SST39LF020-45-4C-WHE has 17 address pins (A0 through A16), supporting its 256K × 8 organization (217 = 131,072 addresses × 8 bits = 2 Mbit). A16 is the most significant address bit and selects the upper half of the memory array (0x20000–0x3FFFF). This matches JEDEC-standard x8 flash addressing and is confirmed in Pin Assignment Figures 2 and 3 of the DS25023A datasheet for the SST39LF020-45-4C-WHE.
Can the SST39LF020-45-4C-WHE be used as a direct replacement for the SST39LF010 or SST39LF040?
No, the SST39LF020-45-4C-WHE is not a direct replacement for SST39LF010 or SST39LF040 due to differences in memory depth and address mapping. SST39LF010 uses A0–A16 (128K × 8), SST39LF020-45-4C-WHE uses A0–A16 (256K × 8), and SST39LF040 uses A0–A18 (512K × 8). While pinout and command set are identical, software must correctly manage the expanded address space. Using SST39LF020-45-4C-WHE in place of SST39LF010 risks accessing undefined memory beyond 128K unless firmware enforces bounds checking.
What package type is used for the SST39LF020-45-4C-WHE, and is it lead-free?
The SST39LF020-45-4C-WHE uses a 32-lead TSOP (8 mm × 14 mm) package, as confirmed in Figure 3 of DS25023A. It is RoHS-compliant and lead-free, meeting JEDEC standard reflow profiles (260°C for 10 seconds). The "WHE" suffix explicitly denotes the TSOP package variant per Microchip's ordering guide. No leaded versions are offered for this part number - all units shipped are fully compliant with EU RoHS Directive 2011/65/EU.
SST39LF020-45-4C-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:
- Discontinued at Digi-Key
- 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:
- 45 ns
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-TSOP
SST39LF020-45-4C-WHE FAQ
1.How can I place an order for SST39LF020-45-4C-WHE through Aetrix?
Please submit a Request for Quotation (RFQ) for SST39LF020-45-4C-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 SST39LF020-45-4C-WHE reliable?
The price and inventory of SST39LF020-45-4C-WHE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SST39LF020-45-4C-WHE is usually 5 days.
3.What payment methods are accepted for SST39LF020-45-4C-WHE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST39LF020-45-4C-WHE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST39LF020-45-4C-WHE?
SST39LF020-45-4C-WHE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST39LF020-45-4C-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 SST39LF020-45-4C-WHE?
For technical support, including SST39LF020-45-4C-WHE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST39LF020-45-4C-WHE requirements.
6.How does Aetrix verify that SST39LF020-45-4C-WHE is sourced from the original manufacturer or authorized distributors?
All SST39LF020-45-4C-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 SST39LF020-45-4C-WHE meets industry standards.
7.What is the process for return or replacement of SST39LF020-45-4C-WHE?
All SST39LF020-45-4C-WHE units undergo pre-shipment inspection (PSI). If there is an issue with SST39LF020-45-4C-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 SST39LF020-45-4C-WHE part is unused and in its original packaging.
Return procedure for SST39LF020-45-4C-WHE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SST39LF020-45-4C-WHE Tags
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