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Microchip Technology SST49LF008A-33-4C-EIE-T
- Part No.:
- SST49LF008A-33-4C-EIE-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 40-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
SST49LF008A-33-4C-EIE-T.pdf
- Description:
- IC FLASH 8MBIT PAR 33MHZ 40TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,703
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Product details
Overview
SST49LF008A-33-4C-EIE-T from Microchip Technology is an 8 Mbit (1024K × 8) Firmware Hub flash memory IC designed for PC-BIOS firmware storage and in-system update. It operates at 3.0–3.6 V, supports Intel 82802 FWH protocol at 33 MHz, features hardware write protection via WP# and TBL# pins, and delivers 100,000 program/erase cycles with >100-year data retention. It serves as a direct read-compatible replacement for Intel's 82802AB in legacy x86 platform boot ROMs.
For engineers reviewing the SST49LF008A-33-4C-EIE-T datasheet, SST49LF008A-33-4C-EIE-T pinout, SST49LF008A-33-4C-EIE-T application, or SST49LF008A-33-4C-EIE-T equivalent, key selection considerations include FWH interface timing compliance, 32-lead TSOP-32 (8mm × 14mm) package compatibility, top-boot block protection architecture, single-supply operation, and JEDEC ID (0xBF5A) verification for BIOS flash validation workflows.
Technical Context
The SST49LF008A-33-4C-EIE-T implements dual-mode operation: Firmware Hub (FWH) mode uses a 5-signal, 33 MHz synchronous interface (FWH[3:0] + FWH4) with 28-bit address fielding and Intel SDP command set support; Parallel Programming (PP) mode uses 11-pin multiplexed address and 8-bit data I/O for factory programming. Its SuperFlash split-gate cell enables fixed 18 ms sector/block erase times independent of cycle count.
Hardware protection is implemented via two dedicated pins: WP# prevents writes to all non-boot blocks when low, while TBL# disables writes to the 64 KB top boot block. Both pins are internally OR'ed with corresponding software Block Locking Registers (e.g., T_BLOCK_LK at FFBF0002H), enabling layered, persistent write-lock enforcement across power cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 8 Mbit (1024K × 8) - provides full BIOS image storage capacity for legacy x86 platforms |
| Supply Voltage | 3.0–3.6 V - single-supply operation eliminates need for voltage translators in 3.3 V systems |
| FWH Clock Frequency | 33 MHz - matches Intel 82802AB timing requirements for seamless drop-in BIOS replacement |
| Endurance | 100,000 cycles (typical) - supports frequent BIOS updates during development and field service |
| Data Retention | >100 years - ensures long-term firmware integrity without refresh in unpowered systems |
| Sector Erase Time | 18 ms (typical) - enables fast, granular firmware patching without full chip erase |
| Byte-Program Time | 14 µs (typical) - allows rapid byte-level BIOS configuration writes during runtime |
| JEDEC ID | 0xBF5A - confirms device identity and manufacturer (SST) during BIOS initialization handshake |
Pinout & Package
Package: 32-lead TSOP (8 mm × 14 mm), RoHS-compliant, lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power Supply | 3.0–3.6 V main supply; requires local 0.1 µF ceramic + 4.7 µF electrolytic decoupling |
| VSS | Ground | Reference ground for all signals; all VSS pins must be connected |
| FWH[3:0] | FWH Data I/O | 4-bit bidirectional bus for Intel FWH protocol; carries address/data/commands in nibble fields |
| FWH4 | FWH Strobe | Active-low enable for FWH mode; initiates and synchronizes all FWH cycles |
| CLK | Clock Input | 33 MHz system clock input for FWH timing; not used in PP mode |
| WP# | Write Protect | Active-low hardware lock for non-boot blocks; must be stable during erase/program |
| TBL# | Top Block Lock | Active-low hardware lock for 64 KB top boot block; cannot float |
| ID[3:0] | Device ID | Strap inputs for multi-device bus selection; boot device requires ID[3:0] = 0000 |
| FGPI[4:0] | General Purpose Inputs | Five configurable board-level inputs readable via GPI_REG at FFBC0100H |
| RST# / INIT# | Reset | Dual-function active-low reset; both pins share internal logic and must be driven low for CPU initialization |
| IC | Interface Config | Mode select: high = PP mode, low = FWH mode; internally pulled down |
| DQ[7:0] | Data I/O | In FWH mode, DQ7/DQ6 provide Data# Polling and Toggle Bit status detection |
Key Features
| Feature | Design Value |
|---|---|
| Firmware Hub Interface Compliance | Fully compatible with Intel 82802AB FWH protocol, including START/IDSEL/IMADDR field sequences and RSYNC handshake |
| SuperFlash Technology | Split-gate cell architecture delivers fixed 18 ms erase time regardless of accumulated program/erase cycles |
| Hardware Write Protection | Dedicated WP# and TBL# pins provide independent, pin-level locking of non-boot and top-boot memory regions |
| Multi-Device Bus Support | ID[3:0] strapping enables up to 16 devices on shared FWH bus; boot device must use ID=0000 |
| Status Detection | DQ7 (Data# Polling) and DQ6 (Toggle Bit) allow real-time monitoring of erase/program completion without polling overhead |
| Flexible Boot Architecture | 64 KB top-boot block with dedicated TBL# control and Block Locking Register (T_BLOCK_LK) supports secure BIOS recovery partitions |
Applications
| Legacy PC BIOS Storage | Industrial Control Firmware |
|---|---|
Use Scenario: Storing and updating x86 platform BIOS firmware in desktop, server, and embedded ATX motherboards using Intel 8xx chipset FWH interface. IC Role / Device Role / Timing Role: Firmware Hub flash memory providing read-compatible replacement for Intel 82802AB with identical FWH timing and command set. Use Value: Enables BIOS update without hardware redesign; supports in-system programming via standard FWH host controller. | Use Scenario: Hosting firmware images for programmable logic controllers (PLCs), HMIs, and industrial gateways requiring field-upgradable code with robust write protection. IC Role / Device Role / Timing Role: Nonvolatile firmware storage with hardware-enforced top-boot block protection to preserve recovery code during remote updates. Use Value: Prevents accidental corruption of critical boot code via dual-layer protection (TBL# pin + T_BLOCK_LK register). |
| Embedded System Boot ROM | Secure Boot Recovery Partition |
Use Scenario: Serving as primary boot ROM for legacy x86-based embedded systems such as medical imaging controllers and point-of-sale terminals. IC Role / Device Role / Timing Role: 8 Mbit FWH-compatible flash memory interfacing directly with Intel ICH southbridge via 33 MHz FWH bus. Use Value: Delivers guaranteed 100,000-cycle endurance and >100-year retention for mission-critical firmware in unattended deployments. | Use Scenario: Implementing a tamper-resistant recovery partition in BIOS firmware that remains write-protected during normal OS operation and updates. IC Role / Device Role / Timing Role: Top-boot block (0xF0000–0xFFFFF) configured with hardware TBL# lock and software Block Locking Register lock-down. Use Value: Ensures recovery code survives malicious or failed firmware updates by enforcing irreversible lock-down via TBL# + Lock-Down bit. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar firmware hub flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Winbond W39V080FAZ | 8 Mbit FWH-compatible flash; 33 MHz max FWH clock; JEDEC ID 0x015B; no FGPI pins | Lacks five general-purpose inputs; uses different block locking register map and ID scheme | Choose when FGPI functionality is unnecessary and Winbond ecosystem integration is preferred |
| Macronix MX29LV800CTTI-70G | 8 Mbit parallel NOR flash; no native FWH interface; requires external glue logic for FWH emulation | Not FWH protocol-compatible; supports only asynchronous parallel interface with CFI command set | Choose only if migrating away from FWH architecture and redesigning host interface logic |
Compared with Winbond W39V080FAZ and Macronix MX29LV800CTTI-70G, the SST49LF008A-33-4C-EIE-T uniquely combines native Intel FWH protocol support, integrated FGPI inputs for board-level signaling, and dual hardware/software write protection-making it the only drop-in solution for legacy BIOS platforms requiring zero PCB changes.
Availability
SST49LF008A-33-4C-EIE-T is available at Aetrix Electronics and suitable for legacy PC motherboard manufacturing, industrial control firmware updates, and embedded x86 boot ROM replacements requiring stable component supply and long-lifecycle support.
Supply support for SST49LF008A-33-4C-EIE-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 is a global semiconductor company specializing in microcontrollers, analog components, and memory solutions, with headquarters in Chandler, Arizona.
The SST49LF008A-33-4C-EIE-T belongs to Microchip's Firmware Hub flash memory product line, engineered specifically for Intel 8xx chipset-based BIOS storage and secure in-system firmware update in legacy computing platforms.
FAQ
What interface modes does the SST49LF008A-33-4C-EIE-T support?
The SST49LF008A-33-4C-EIE-T supports two distinct interface modes: Firmware Hub (FWH) mode for in-system programming using Intel's proprietary 5-signal protocol (FWH[3:0] + FWH4) at 33 MHz, and Parallel Programming (PP) mode for factory programming via 11-pin multiplexed address and 8-bit data I/O. Mode selection is controlled by the IC pin, which is internally pulled down to default FWH mode. The SST49LF008A-33-4C-EIE-T must be configured at power-up and cannot switch modes dynamically during operation.
How does hardware write protection work on the SST49LF008A-33-4C-EIE-T?
Hardware write protection on the SST49LF008A-33-4C-EIE-T is implemented through two dedicated pins: WP# (Write Protect) and TBL# (Top Block Lock). WP# prevents programming to all non-boot blocks when asserted low, while TBL# protects the 64 KB top boot block (0xF0000–0xFFFFF). Both pins are internally OR'ed with corresponding Block Locking Registers, meaning hardware assertion overrides software unlock attempts. Neither pin may be left unconnected, and both must remain stable throughout erase/program operations to avoid unpredictable behavior.
What is the purpose of the ID[3:0] pins on the SST49LF008A-33-4C-EIE-T?
The ID[3:0] pins on the SST49LF008A-33-4C-EIE-T enable multi-device selection on a shared FWH bus. Each device is assigned a unique 4-bit strap value; the boot device must use ID[3:0] = 0000, with subsequent devices using sequential values (0001, 0010, etc.). During FWH communication, the host transmits an IDSEL field, and only the device whose strapped ID matches will respond. This allows up to 16 SST49LF008A-33-4C-EIE-T devices to coexist on one bus, supporting complex BIOS partitioning or redundant firmware architectures.
Can the SST49LF008A-33-4C-EIE-T be used in new designs, or is it only for legacy replacement?
The SST49LF008A-33-4C-EIE-T is primarily intended for legacy design support and BIOS replacement in systems based on Intel 8xx chipsets and FWH interfaces. While functional in new designs requiring 8 Mbit FWH-compatible flash, its 33 MHz FWH clock limit, TSOP-32 packaging, and lack of modern features (e.g., SPI, XIP, security registers) make it less suitable than newer alternatives for greenfield projects. However, for maintaining long-term supply continuity in existing industrial or embedded x86 platforms, the SST49LF008A-33-4C-EIE-T remains a validated, drop-in solution.
What status detection methods does the SST49LF008A-33-4C-EIE-T provide for erase and program operations?
The SST49LF008A-33-4C-EIE-T provides two software-controlled status detection methods: Data# Polling (DQ7) and Toggle Bit (DQ6). During erase/program, DQ7 returns complemented data (or '0' during erase) until completion, then true data; DQ6 toggles between 0 and 1 until completion, then holds steady. These signals are accessible during FWH Read cycles and allow the host to poll without fixed delays. The SST49LF008A-33-4C-EIE-T also supports automatic end-of-write detection via RSYNC synchronization in FWH mode.
SST49LF008A-33-4C-EIE-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- SST49
- Package/Case:
- 40-TFSOP (0.724", 18.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 8Mbit
- Memory Organization:
- 1M x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- 33 MHz
- Write Cycle Time - Word, Page:
- 20µs
- Access Time:
- 120 ns
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- 0°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-TSOP
SST49LF008A-33-4C-EIE-T FAQ
1.How can I place an order for SST49LF008A-33-4C-EIE-T through Aetrix?
Please submit a Request for Quotation (RFQ) for SST49LF008A-33-4C-EIE-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 SST49LF008A-33-4C-EIE-T reliable?
The price and inventory of SST49LF008A-33-4C-EIE-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SST49LF008A-33-4C-EIE-T is usually 5 days.
3.What payment methods are accepted for SST49LF008A-33-4C-EIE-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST49LF008A-33-4C-EIE-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST49LF008A-33-4C-EIE-T?
SST49LF008A-33-4C-EIE-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST49LF008A-33-4C-EIE-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 SST49LF008A-33-4C-EIE-T?
For technical support, including SST49LF008A-33-4C-EIE-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST49LF008A-33-4C-EIE-T requirements.
6.How does Aetrix verify that SST49LF008A-33-4C-EIE-T is sourced from the original manufacturer or authorized distributors?
All SST49LF008A-33-4C-EIE-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 SST49LF008A-33-4C-EIE-T meets industry standards.
7.What is the process for return or replacement of SST49LF008A-33-4C-EIE-T?
All SST49LF008A-33-4C-EIE-T units undergo pre-shipment inspection (PSI). If there is an issue with SST49LF008A-33-4C-EIE-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 SST49LF008A-33-4C-EIE-T part is unused and in its original packaging.
Return procedure for SST49LF008A-33-4C-EIE-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SST49LF008A-33-4C-EIE-T Tags
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