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Microchip Technology SST39LF040-55-4C-WHE
- Part No.:
- SST39LF040-55-4C-WHE
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
SST39LF040-55-4C-WHE.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,402
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Product details
Overview
SST39LF040-55-4C-WHE from Microchip Technology (formerly Silicon Storage Technology) is a 4 Mbit (512K × 8) CMOS Multi-Purpose Flash memory IC with single 3.0–3.6 V supply, 55 ns read access time, and uniform 4 KB sector-erase architecture. It implements SuperFlash® split-gate technology for high reliability and is used in embedded firmware storage, BIOS/UEFI code retention, and industrial controller configuration memory.
For engineers reviewing the SST39LF040-55-4C-WHE datasheet, SST39LF040-55-4C-WHE pinout, SST39LF040-55-4C-WHE application, or SST39LF040-55-4C-WHE equivalent, key selection criteria include JEDEC-standard x8 parallel interface compatibility, hardware/software data protection, 100,000 program/erase endurance, and support for byte-program and chip-erase operations without external VPP.
Technical Context
The SST39LF040-55-4C-WHE uses SST's proprietary SuperFlash® technology featuring a split-gate cell and thick-oxide tunneling injector, enabling fixed erase/program times independent of cycle count. It supports standard microprocessor bus interfacing via CE#, OE#, and WE# control signals with latched address/data inputs.
It operates in commercial temperature range (0°C to +70°C), conforms to JEDEC-standard pinouts and command sets for x8 flash memories, and provides two end-of-write detection methods: Data# Polling (DQ7) and Toggle Bit (DQ6), both valid after the fourth (byte-program) or sixth (sector/chip-erase) WE#/CE# pulse.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512K × 8), providing sufficient space for boot code, firmware images, and configuration tables in resource-constrained embedded systems. |
| Read Access Time | 55 ns - enables direct execution (XIP) from flash in 14 MHz microcontroller systems without wait states. |
| Supply Voltage | 3.0–3.6 V - compatible with 3.3 V logic rails; eliminates need for separate programming voltage (VPP generated internally). |
| Endurance | 100,000 program/erase cycles - supports field firmware updates over product lifetime in industrial controllers and networking equipment. |
| Data Retention | Greater than 100 years - ensures long-term nonvolatile storage of calibration data, security keys, and device identity without refresh. |
| Sector Size | Uniform 4 KB sectors - allows granular firmware patching and secure partitioning of code vs. configuration regions. |
| Byte-Program Time | 14 µs typical - enables fast in-system updates of small parameter blocks without blocking system operation for extended periods. |
Pinout & Package
32-lead PLCC (Plastic Leaded Chip Carrier) package, RoHS compliant, with JEDEC-standard x8 parallel interface pinout. Pin assignments match industry-standard flash memory layouts for drop-in compatibility in legacy designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | A0–A17 used for 512K × 8 addressing; A18 is MSB (AMS) and selects sector during erase; unused pins are NC per variant. |
| DQ0–DQ7 | Data Input/Output | Bi-directional 8-bit data bus; tri-stated when CE# or OE# is high; supports latched write and true-data read post-program. |
| CE# | Chip Enable | Active-low device select; must be low for read, program, or erase; high-Z output and standby current (1 µA) when asserted high. |
| OE# | Output Enable | Active-low output gate; controls data bus drive during read; does not affect internal operations when high. |
| WE# | Write Enable | Active-low control for byte-program and erase command latching; initiates internal timing sequences on rising edge. |
| VDD | Power Supply | 3.0–3.6 V supply; powers all internal logic and charge pumps; internal VPP generation eliminates external high-voltage circuitry. |
| VSS | Ground | Reference return path for all I/O and core logic; decoupling required within 1 cm of VDD pin per layout guidelines. |
| NC | No Connection | Pins 12, 16, 24, and 31 are unconnected; must remain floating - no pull-up/down or routing allowed. |
Key Features
| Feature | Design Value |
|---|---|
| SuperFlash® Technology | Split-gate cell with thick-oxide tunneling injector delivers stable 55 ns read timing and fixed 14 µs byte-program time across full 100,000-cycle life. |
| Hardware + Software Data Protection | Glitch immunity (<5 ns), VDD power-up/down detection, and mandatory 3-byte (program) / 6-byte (erase) JEDEC-compliant command sequences prevent accidental writes. |
| End-of-Write Detection | DQ7 (Data# Polling) and DQ6 (Toggle Bit) provide deterministic, software-pollable status without requiring timers or external interrupt lines. |
| Low Power Operation | 5 mA active current at 14 MHz and 1 µA standby current enable battery-backed or energy-harvesting applications with infrequent firmware updates. |
| JEDEC Standard Compliance | Fully compatible with industry-standard x8 flash command sets and pinouts, enabling replacement in existing PCBs without redesign. |
Applications
| Industrial PLC Firmware Storage | Embedded Network Router Boot Code |
|---|---|
|
Use Scenario: Storing and updating ladder logic firmware in programmable logic controllers operating in factory-floor environments with wide temperature swings and EMI exposure. IC Role / Device Role / Timing Role: Nonvolatile code storage with XIP-capable 55 ns read access; sector-erase enables safe field upgrades without erasing entire application image. Use Value: 100-year data retention ensures firmware integrity over decades of unattended operation; 100,000-cycle endurance supports quarterly security patch deployments. |
Use Scenario: Holding bootloader and initial firmware images in enterprise-grade Ethernet switches requiring secure, authenticated boot sequences. IC Role / Device Role / Timing Role: Primary boot memory mapped into CPU address space; supports hardware reset recovery and dual-image failover via sector-level erase granularity. Use Value: Internal VPP generation eliminates high-voltage circuitry, reducing BOM cost and board area; JEDEC pinout ensures compatibility with legacy router reference designs. |
| Medical Device Configuration Memory | Automotive Body Control Module (BCM) Calibration Data |
|
Use Scenario: Retaining user-configurable parameters (e.g., alarm thresholds, display language, audit log settings) in Class IIa medical instruments with regulatory traceability requirements. IC Role / Device Role / Timing Role: Secure, tamper-resistant configuration store; software data protection prevents unauthorized modification during service mode. Use Value: RoHS-compliant 32-lead PLCC package meets medical-grade reflow and long-term reliability standards; >100-year retention satisfies ISO 13485 archival mandates. |
Use Scenario: Storing vehicle-specific calibration maps (e.g., window lift profiles, mirror positioning, lighting response curves) in automotive BCMs subject to AEC-Q100 stress testing. IC Role / Device Role / Timing Role: EEPROM-replacement nonvolatile memory with faster write performance and higher endurance than legacy serial EEPROMs. Use Value: 3.0–3.6 V operation aligns with automotive 3.3 V domain supplies; 0°C to +70°C commercial grade meets cabin ambient requirements for non-engine compartments. |
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 |
|---|---|---|---|
| MX29LV400CBTI-70G | 4 Mbit, 3.0–3.6 V, 70 ns read, 32-pin TSOP; lacks SuperFlash® fixed-timing guarantee; requires external VPP for programming. | Higher read latency limits XIP performance; lower endurance (100K vs. 100K typical but degrades with cycles). | Select when TSOP footprint is mandatory and 70 ns access suffices; verify VPP circuit availability. |
| EN29LV400AB-70TP | 4 Mbit, 2.7–3.6 V, 70 ns read, 32-pin TSOP; wider VDD range but slower timing; JEDEC-compatible but no Toggle Bit support. | Supports battery-powered operation down to 2.7 V; relies solely on Data# Polling for status detection. | Prefer for portable or low-power systems needing extended voltage range; confirm software polling robustness in real-time OS context. |
Compared with MX29LV400CBTI-70G and EN29LV400AB-70TP, the SST39LF040-55-4C-WHE offers superior timing consistency (55 ns fixed read, stable 14 µs program), integrated VPP, and dual-status detection - critical for deterministic firmware update workflows in safety-critical embedded systems.
Availability
SST39LF040-55-4C-WHE is available at Aetrix Electronics and suitable for industrial PLC firmware storage, embedded network router boot code, and medical device configuration memory requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.
Supply support for SST39LF040-55-4C-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 maintains full support for the SuperFlash® portfolio, delivering high-reliability nonvolatile memory solutions for industrial, automotive, and computing markets.
The SST39LF040-55-4C-WHE belongs to the SST39LFxx0 family of Multi-Purpose Flash devices, designed specifically for cost-sensitive, high-reliability embedded applications requiring fast parallel read access, robust in-system programmability, and long-term data integrity without external high-voltage circuitry.
FAQ
What is the operating voltage range for the SST39LF040-55-4C-WHE?
The SST39LF040-55-4C-WHE operates from 3.0 V to 3.6 V DC. This single-supply range eliminates the need for external VPP generation, as internal charge pumps handle programming and erase voltages. Operation outside this range may cause unreliable writes or data corruption, and the device will inhibit writes if VDD drops below 1.5 V during power-up/down sequences.
Does the SST39LF040-55-4C-WHE support byte-level programming?
Yes, the SST39LF040-55-4C-WHE supports true byte-program operations with a typical time of 14 µs per byte. Before programming, the target 4 KB sector must be erased. The device uses a three-byte software data protection sequence (5555H/AAH → 2AAAH/55H → 5555H/A0H) to initiate each byte-write, ensuring immunity to spurious commands during system noise events.
How is end-of-write detection implemented in the SST39LF040-55-4C-WHE?
The SST39LF040-55-4C-WHE provides two hardware-supported status indicators: Data# Polling (DQ7) and Toggle Bit (DQ6). After initiating a program or erase cycle, DQ7 toggles between complemented and true data, while DQ6 alternates between 0 and 1 until completion. Both become valid after the fourth (program) or sixth (erase) WE#/CE# pulse, enabling efficient polling without timers or interrupts.
What package type is used for the SST39LF040-55-4C-WHE?
The SST39LF040-55-4C-WHE is supplied in a 32-lead PLCC (Plastic Leaded Chip Carrier) package, RoHS compliant, with standard pinout matching JEDEC MO-100 specifications. Its leaded construction provides mechanical robustness for through-hole or surface-mount assembly in industrial environments where thermal cycling and vibration resistance are critical.
Is the SST39LF040-55-4C-WHE pin-compatible with other members of the SST39LF/VFxx0 family?
Yes, the SST39LF040-55-4C-WHE shares identical pinout and command set with SST39LF010-55-4C-WHE and SST39LF020-55-4C-WHE in the same PLCC package. Address line mapping differs (A18 used for SST39LF040 vs. A16 for SST39LF010), but pin functions, timing, and protection schemes are fully consistent - enabling scalable memory design across 1/2/4 Mbit variants.
SST39LF040-55-4C-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:
- 4Mbit
- Memory Organization:
- 512K 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
SST39LF040-55-4C-WHE FAQ
1.How can I place an order for SST39LF040-55-4C-WHE through Aetrix?
Please submit a Request for Quotation (RFQ) for SST39LF040-55-4C-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 SST39LF040-55-4C-WHE reliable?
The price and inventory of SST39LF040-55-4C-WHE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SST39LF040-55-4C-WHE is usually 5 days.
3.What payment methods are accepted for SST39LF040-55-4C-WHE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST39LF040-55-4C-WHE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST39LF040-55-4C-WHE?
SST39LF040-55-4C-WHE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST39LF040-55-4C-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 SST39LF040-55-4C-WHE?
For technical support, including SST39LF040-55-4C-WHE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST39LF040-55-4C-WHE requirements.
6.How does Aetrix verify that SST39LF040-55-4C-WHE is sourced from the original manufacturer or authorized distributors?
All SST39LF040-55-4C-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 SST39LF040-55-4C-WHE meets industry standards.
7.What is the process for return or replacement of SST39LF040-55-4C-WHE?
All SST39LF040-55-4C-WHE units undergo pre-shipment inspection (PSI). If there is an issue with SST39LF040-55-4C-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 SST39LF040-55-4C-WHE part is unused and in its original packaging.
Return procedure for SST39LF040-55-4C-WHE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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