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Microchip Technology SST39LF402C-55-4C-EKE
- Part No.:
- SST39LF402C-55-4C-EKE
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 48-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
SST39LF402C-55-4C-EKE.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 48TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,527
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Product details
Overview
SST39LF402C-55-4C-EKE from Microchip is a 4 Mbit (256K × 16) CMOS Multi-Purpose Flash Plus memory IC with SuperFlash® technology, designed for embedded program/data storage in microcontroller-based systems. It operates at 3.0–3.6 V, delivers 55 ns read access time, supports hardware block protection on the top 8 KWord boot sector, and features erase-suspend/resume capability for real-time firmware updates.
For engineers reviewing the SST39LF402C-55-4C-EKE datasheet, SST39LF402C-55-4C-EKE pinout, SST39LF402C-55-4C-EKE application, or SST39LF402C-55-4C-EKE equivalent, key selection criteria include boot-block architecture (top-protect), 3.0–3.6 V write voltage range, TSOP-48 package compatibility, and JEDEC-standard x16 parallel interface timing compliance.
Technical Context
This device implements a split-gate SuperFlash® cell architecture enabling fixed 7 µs word-program and 18 ms sector/block-erase times independent of cycle count-eliminating software de-rating. Its command-set follows JEDEC-standard x16 flash protocols, including six-byte erase sequences and three-byte program initiation.
The SST39LF402C-55-4C-EKE integrates dual status detection (DQ6 toggle bit + DQ7 data# polling), open-drain RY/BY# output with external pull-up requirement, and hardware WP#-controlled top-boot-block protection (3E000H–3FFFFH). It supports CFI query mode and factory/user Security ID space (128-bit factory ID + 128-word user field).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (256K × 16 organization); supports full 16-bit data bus interface without byte-lane splitting. |
| Read Access Time | 55 ns max; enables direct connection to 16-bit microcontrollers running ≤18 MHz without wait states. |
| Write Voltage Range | 3.0–3.6 V only; distinct from SST39VF402C (2.7–3.6 V); requires stable mid-range supply for reliable programming. |
| Endurance | 100,000 program/erase cycles typical; sufficient for field firmware updates over 10+ years in industrial control applications. |
| Data Retention | >100 years at 25°C; validated per JEDEC JESD22-A117; ensures long-term reliability in unpowered storage. |
| Power Consumption | 5 mA active current (5 MHz), 3 µA standby/auto-low-power mode; reduces system-level power budget in battery-backed designs. |
| Erase Architecture | Uniform 2 KWord sectors + flexible blocks (seven 32 KWord, one 16 KWord, two 4 KWord, one 8 KWord); enables granular firmware partitioning. |
Pinout & Package
Package: 48-lead TSOP (12 mm × 20 mm), RoHS-compliant, standard pinout per JEDEC MO-142AC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus; A17 is most significant; AMS = A17 for sector/block selection during erase commands. |
| DQ0–DQ15 | Data I/O | 16-bit bidirectional data bus; latched internally during writes; tri-stated when CE# or OE# high. |
| CE# | Chip Enable | Active-low chip select; must be low to enable read/write; controls address/data latch timing edges. |
| OE# | Output Enable | Active-low output gate; used with CE# to control read data flow; does not affect internal operations. |
| WE# | Write Enable | Active-low write strobe; latches address/data and initiates command sequences; rising edge triggers internal operations. |
| WP# | Write Protect | Active-low hardware lock for top 8 KWord boot block (3E000H–3FFFFH); floating = internally pulled high = unprotected. |
| RST# | Reset | Active-low hardware reset; terminates ongoing erase/program and forces return to read mode within TRP. |
| RY/BY# | Ready/Busy# | Open-drain status output; requires 10–100 kΩ pull-up; low = operation in progress, high = ready for next access. |
| VDD | Supply | 3.0–3.6 V core supply; powers all logic and flash operations; must be stable during erase/program. |
| VSS | Ground | Signal and power ground reference; two dedicated pins ensure low-impedance return path. |
| NC | No Connect | Unbonded pins (e.g., A13, A9, A12 in TSOP); must remain unconnected per design. |
Key Features
| Feature | Design Value |
|---|---|
| SuperFlash® Technology | Split-gate cell with thick-oxide tunneling injector enables fixed 7 µs program and 18 ms erase times across full endurance life. |
| Erase-Suspend/Resume | Allows real-time read access to non-suspended sectors during background erase; critical for fail-safe bootloader execution. |
| Top Boot Block Protection | Hardware-enforced write/erase lock on top 8 KWord (3E000H–3FFFFH); prevents accidental corruption of boot code. |
| Security ID Space | Factory-programmed 128-bit ID + 128-word user field; supports secure device authentication and firmware binding. |
| Auto Low Power Mode | Reduces active read current from 5 mA to 3 µA after valid read access; eliminates need for external power management logic. |
Applications
| Industrial PLC Firmware Storage | Automotive ECU Bootloader Memory |
|---|---|
Use Scenario: Storing and updating ladder logic firmware in programmable logic controllers with field service requirements. IC Role / Device Role / Timing Role: Nonvolatile program memory mapped to microcontroller address space; accessed via 16-bit parallel bus with 55 ns timing. Use Value: Top-boot-block protection ensures bootloader integrity during remote firmware upgrades; 100,000-cycle endurance supports >10 years of scheduled updates. | Use Scenario: Holding certified bootloader code in automotive engine control units requiring ASIL-B functional safety compliance. IC Role / Device Role / Timing Role: Read-only boot memory during power-on initialization; write-enabled only during authorized reprogramming sessions. Use Value: Hardware WP# lock prevents runtime corruption; RY/BY# status signal enables deterministic boot timing verification. |
| Medical Device Configuration Storage | Networking Equipment Feature License Key Storage |
Use Scenario: Retaining calibration parameters and user-configurable settings in portable diagnostic equipment with battery backup. IC Role / Device Role / Timing Role: Low-power configuration memory accessed infrequently; leverages 3 µA auto-low-power mode between reads. Use Value: >100-year data retention guarantees parameter persistence across product lifetime without refresh cycles. | Use Scenario: Securely storing encrypted license keys and feature-enable bits in enterprise switches and routers. IC Role / Device Role / Timing Role: Security-critical nonvolatile storage accessed via CFI query and Security ID command sequences. Use Value: Factory-programmed 128-bit ID binds license to hardware; user-programmable 128-word field enables revocable feature activation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar parallel NOR flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF402C-70-4C-EKE | Wider 2.7–3.6 V write voltage range; 70 ns read access; same pinout and command set. | Supports lower-voltage host systems (e.g., 2.7 V logic rails); slower timing may require wait-state insertion. | Select when system supply varies below 3.0 V or when 70 ns timing suffices for target MCU clock speed. |
| MX29LV400CTTI-70G | 4 Mbit x16, 70 ns access, 2.7–3.6 V operation; supports CFI but lacks erase-suspend and Security ID. | Lower-cost alternative without real-time suspend capability or hardware-secured ID space. | Choose for cost-sensitive applications where boot integrity and suspend functionality are non-critical. |
Compared with SST39VF402C-70-4C-EKE and MX29LV400CTTI-70G, the SST39LF402C-55-4C-EKE provides faster 55 ns read timing and tighter 3.0–3.6 V write window-optimizing performance in stable 3.3 V systems-while retaining unique SuperFlash® reliability and Security ID features absent in the alternatives.
Availability
SST39LF402C-55-4C-EKE is available at Aetrix Electronics and suitable for industrial PLC firmware storage, automotive ECU bootloader memory, and medical device configuration storage requiring stable component supply and long-term lifecycle support.
Supply support for SST39LF402C-55-4C-EKE 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 leading provider of microcontroller, analog, FPGA, and memory solutions, acquired Silicon Storage Technology (SST) in 2010 to expand its serial and parallel flash portfolio.
The SST39LF402C-55-4C-EKE belongs to the Multi-Purpose Flash Plus (MPF+) family, engineered for high-reliability embedded applications demanding fast, secure, and long-life nonvolatile storage with minimal system-level overhead.
FAQ
What is the exact memory organization of the SST39LF402C-55-4C-EKE?
The SST39LF402C-55-4C-EKE is organized as 256K × 16, delivering 4 Mbit total capacity with a 16-bit data bus interface. This configuration maps directly to 16-bit microcontroller address spaces without byte-lane multiplexing, supporting efficient burst reads and word-aligned firmware execution. The SST39LF402C-55-4C-EKE uses A0–A17 for addressing, with AMS = A17 defining sector/block boundaries during erase operations.
Does the SST39LF402C-55-4C-EKE support both top and bottom boot block protection?
No-the SST39LF402C-55-4C-EKE supports top boot block protection only, covering the address range 3E000H–3FFFFH (8 KWord). Bottom boot protection is exclusive to the SST39LF401C variant. This distinction is hardwired in silicon and cannot be configured via software or pins. The SST39LF402C-55-4C-EKE's WP# pin enables hardware lock of this top region, preventing inadvertent erase/program during system operation.
What are the required external components for proper operation of the SST39LF402C-55-4C-EKE?
The SST39LF402C-55-4C-EKE requires a 10–100 kΩ pull-up resistor on the RY/BY# pin to ensure valid high-level signaling, as it is an open-drain output. No external VPP generator is needed-the device uses internal charge pumps. Decoupling capacitors (0.1 µF ceramic near VDD/VSS) are mandatory per layout guidelines. WP# may be tied high or low depending on protection needs; floating is permitted but defaults to unprotected via internal pull-up.
How does the erase-suspend feature work in the SST39LF402C-55-4C-EKE?
The SST39LF402C-55-4C-EKE supports Erase-Suspend via the B0H command, temporarily halting an ongoing sector or block erase to allow read access to non-suspended memory regions. During suspend, DQ2 toggles to indicate suspended state, while DQ6 remains high. The SST39LF402C-55-4C-EKE resumes automatically upon issuing the 30H Erase Resume command. This enables safe bootloader execution or real-time diagnostics without aborting long-duration erase operations.
Is the SST39LF402C-55-4C-EKE compatible with JEDEC-standard x16 flash interfaces?
Yes-the SST39LF402C-55-4C-EKE conforms fully to JEDEC Standard JESD21-C for x16 parallel flash pinouts and command sets. It supports standard read, word-program, sector/block/chip-erase, and CFI query modes using identical timing and bus protocols as industry-wide x16 NOR flash devices. This ensures drop-in compatibility with existing 16-bit flash controllers and eliminates custom driver development for the SST39LF402C-55-4C-EKE.
SST39LF402C-55-4C-EKE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- SST39 MPF™
- Package/Case:
- 48-TFSOP (0.724", 18.40mm Width)
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 4Mbit
- Memory Organization:
- 256K x 16
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 10µs
- 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:
- 48-TSOP
SST39LF402C-55-4C-EKE FAQ
1.How can I place an order for SST39LF402C-55-4C-EKE through Aetrix?
Please submit a Request for Quotation (RFQ) for SST39LF402C-55-4C-EKE 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 SST39LF402C-55-4C-EKE reliable?
The price and inventory of SST39LF402C-55-4C-EKE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SST39LF402C-55-4C-EKE is usually 5 days.
3.What payment methods are accepted for SST39LF402C-55-4C-EKE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST39LF402C-55-4C-EKE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST39LF402C-55-4C-EKE?
SST39LF402C-55-4C-EKE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST39LF402C-55-4C-EKE 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 SST39LF402C-55-4C-EKE?
For technical support, including SST39LF402C-55-4C-EKE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST39LF402C-55-4C-EKE requirements.
6.How does Aetrix verify that SST39LF402C-55-4C-EKE is sourced from the original manufacturer or authorized distributors?
All SST39LF402C-55-4C-EKE 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 SST39LF402C-55-4C-EKE meets industry standards.
7.What is the process for return or replacement of SST39LF402C-55-4C-EKE?
All SST39LF402C-55-4C-EKE units undergo pre-shipment inspection (PSI). If there is an issue with SST39LF402C-55-4C-EKE, 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 SST39LF402C-55-4C-EKE part is unused and in its original packaging.
Return procedure for SST39LF402C-55-4C-EKE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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