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Microchip Technology SST49LF008A-33-4C-WHE-T
- Part No.:
- SST49LF008A-33-4C-WHE-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
SST49LF008A-33-4C-WHE-T.pdf
- Description:
- IC FLASH 8MBIT PAR 33MHZ 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,748
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Product details
Overview
SST49LF008A-33-4C-WHE-T from Microchip Technology is an 8 Mbit (1024K × 8) Firmware Hub flash memory IC designed for PC-BIOS applications, providing Intel® 82802 FWH read-compatibility, hardware write protection via WP# and TBL#, and dual-mode operation (FWH interface at 33 MHz or Parallel Programming). It delivers 100,000 program/erase cycles and >100 years data retention with single 3.0–3.6 V supply operation.
For engineers reviewing the SST49LF008A-33-4C-WHE-T datasheet, SST49LF008A-33-4C-WHE-T pinout, SST49LF008A-33-4C-WHE-T application, or SST49LF008A-33-4C-WHE-T equivalent, key selection considerations include FWH mode timing compliance, boot-block hardware lock behavior, ID[3:0] multi-device strapping, SuperFlash energy efficiency, and TSOP-32 (8mm × 14mm) package compatibility with legacy BIOS socket footprints.
Technical Context
The SST49LF008A-33-4C-WHE-T implements a proprietary SuperFlash split-gate cell architecture enabling fixed erase/program times independent of cycle count. It supports two mutually exclusive interface modes: Firmware Hub (FWH) mode using 5-signal serial-like communication (FWH[3:0], FWH4, CLK) at 33 MHz, and Parallel Programming (PP) mode using multiplexed 11-bit address/8-bit data I/O with R/C# control.
Hardware protection is implemented through dedicated pins-WP# for full-chip write inhibit and TBL# for top 64 KB boot block lock-and reinforced by software-configurable Block Locking Registers accessible at defined memory-mapped addresses. The device integrates five general-purpose input pins (FGPI[4:0]) readable via GPI_REG and four ID pins (ID[3:0]) for multi-device bus arbitration in FWH mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 8 Mbit (1024K × 8), directly replacing Intel 82802 FWH in BIOS storage |
| Supply Voltage | 3.0–3.6 V single supply - eliminates need for dual-voltage rails in legacy motherboard designs |
| FWH Clock Frequency | 33 MHz - matches Intel ICH timing requirements for seamless BIOS interface integration |
| Endurance | 100,000 program/erase cycles - enables field firmware updates without premature wear-out |
| Data Retention | >100 years - ensures BIOS code integrity across product lifetime without refresh |
| Byte-Program Time | 14 µs typical - reduces update latency during BIOS patching or recovery sequences |
| Sector-Erase Time | 18 ms typical - enables fast, granular firmware partition updates without full chip erase |
| Package | 32-lead TSOP (8 mm × 14 mm) - drop-in compatible with standard BIOS socket footprints |
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 core 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 to system GND |
| FWH[3:0] | FWH Data I/O | 4-bit bidirectional bus for FWH protocol; carries address, command, and data nibbles |
| FWH4 | FWH Control Input | Active-low enable for FWH mode; initiates bus turnaround and sync signaling |
| CLK | Clock Input | 33 MHz system clock input; synchronous timing reference for all FWH transactions |
| WP# | Hardware Write Protect | Active-low global lock; prevents programming to all sectors except top boot block when asserted |
| TBL# | Top Block Lock | Active-low boot block lock; protects highest 64 KB regardless of software register state |
| ID[3:0] | Device Identification | Strap inputs for multi-device bus selection; boot device must be 0000 |
| FGPI[4:0] | General Purpose Inputs | Five board-level configuration inputs readable via GPI_REG at FFBC0100H |
| IC | Interface Configuration | Mode select: high = PP mode, low = FWH mode; internally pulled down |
| RST# / INIT# | Reset Inputs | Dual active-low reset pins; identical internal function; required for CPU initialization |
| OE# | Output Enable | Controls DQ[7:0] tri-state; used in PP mode only |
| WE# | Write Enable | Controls write latching in PP mode; not used in FWH mode |
| A[10:0] / DQ[7:0] | Multiplexed Address/Data | In PP mode: row/column address inputs (A10–A0) and data I/O (DQ7–DQ0) |
Key Features
| Feature | Design Value |
|---|---|
| Firmware Hub Interface Mode | Intel-compatible 5-signal protocol (FWH[3:0], FWH4, CLK) enabling direct BIOS host integration without translation logic |
| SuperFlash Technology | Split-gate cell architecture delivering fixed 14 µs byte-program and 18 ms sector-erase times across full endurance life |
| Dual-Mode Operation | Hardware-selectable FWH (in-system update) or PP (high-speed factory programming) interfaces on same die |
| Hardware Write Protection | Dedicated WP# and TBL# pins provide fail-safe, pin-level lock for full chip and top 64 KB boot block respectively |
| Multi-Device Bus Support | ID[3:0] strapping allows up to 16 SST49LF008A-33-4C-WHE-T devices on shared FWH bus with unique addressing |
| General Purpose Inputs | Five FGPI pins readable via memory-mapped GPI_REG support board-specific configuration without external GPIO expanders |
Applications
| PC Motherboard BIOS Storage | Industrial Control System Firmware |
|---|---|
Use Scenario: Storing and updating x86 platform BIOS/UEFI firmware in desktop, server, and embedded ATX motherboards. IC Role / Device Role / Timing Role: Firmware Hub interface device acting as primary nonvolatile code store, directly addressed by Intel ICH via FWH protocol at 33 MHz. Use Value: Enables secure, field-upgradable BIOS with hardware-enforced boot block protection and 100-year data retention. | Use Scenario: Hosting bootloader and real-time OS kernel in ruggedized PLCs and HMIs requiring long-life firmware storage. IC Role / Device Role / Timing Role: Standalone flash memory providing Intel FWH-compatible boot interface for ARM/x86 industrial SoCs with extended temperature tolerance. Use Value: Delivers deterministic 18 ms sector erase and 14 µs byte program for rapid firmware patch deployment in mission-critical environments. |
| Legacy Embedded System Upgrade | Multi-Device BIOS Expansion |
Use Scenario: Replacing obsolete Intel 82802AB FWH parts in aging medical or telecom equipment without PCB redesign. IC Role / Device Role / Timing Role: Pin- and protocol-compatible drop-in replacement supporting identical FWH command set and timing margins. Use Value: Extends product lifecycle with RoHS-compliant, lead-free TSOP-32 package and improved 100,000-cycle endurance. | Use Scenario: Expanding BIOS capacity beyond 8 Mbit using multiple SST49LF008A-33-4C-WHE-T devices on shared FWH bus. IC Role / Device Role / Timing Role: One boot device (ID[3:0]=0000) and up to 15 secondary devices (ID[3:0]=0001–1111) sharing FWH[3:0]/CLK lines. Use Value: Enables scalable firmware architecture with hardware-strapped device selection and no additional address decoding logic. |
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 |
|---|---|---|---|
| MX29LV008CTTC-90G | 8 Mbit, 3.0–3.6 V, 90 ns access time; parallel-only interface (no FWH mode); JEDEC-compatible but lacks Intel FWH protocol support | Requires external FWH-to-parallel bridge logic for BIOS integration; unsuitable for direct ICH connection | Select only if existing design uses parallel flash interface and FWH compatibility is not required |
| EN29LV008A-70TCP | 8 Mbit, 3.0–3.6 V, 70 ns access; parallel interface with software-controlled boot block protection; no FWH mode or ID pin support | Cannot replace SST49LF008A-33-4C-WHE-T in FWH-based systems without hardware redesign | Use only in new parallel-flash designs where Intel FWH protocol is not mandated |
Compared with MX29LV008CTTC-90G and EN29LV008A-70TCP, the SST49LF008A-33-4C-WHE-T uniquely provides native Intel FWH protocol support, hardware ID-based multi-device arbitration, and integrated TBL#/WP# lock pins-making it the sole option for drop-in BIOS upgrades in Intel chipset platforms without interface translation.
Availability
SST49LF008A-33-4C-WHE-T is available at Aetrix Electronics and suitable for PC motherboard BIOS storage, industrial control system firmware, legacy embedded system upgrades, and multi-device BIOS expansion requiring stable component supply and long-term obsolescence management.
Supply support for SST49LF008A-33-4C-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 is a global semiconductor company specializing in microcontrollers, analog components, and memory solutions, with headquarters in Chandler, Arizona.
The SST49LF008A-33-4C-WHE-T belongs to Microchip's Firmware Hub flash memory product line, engineered specifically for Intel chipset-based BIOS/UEFI storage with emphasis on protocol compatibility, hardware security, and long-term reliability in computing platforms.
FAQ
What interface modes does the SST49LF008A-33-4C-WHE-T support?
The SST49LF008A-33-4C-WHE-T supports two distinct interface modes: Firmware Hub (FWH) mode using a 5-signal interface (FWH[3:0], FWH4, CLK) at 33 MHz for in-system BIOS updates, and Parallel Programming (PP) mode using multiplexed 11-bit address/8-bit data I/O for high-speed factory programming. Mode selection is controlled by the IC pin, which must be set before power-up or reset and cannot change during operation.
How does hardware write protection work on the SST49LF008A-33-4C-WHE-T?
The SST49LF008A-33-4C-WHE-T implements dual hardware write protection: WP# pin locks all sectors except the top 64 KB boot block when low, while TBL# pin exclusively locks the top boot block regardless of software register state. Both pins must be held stable at VIH throughout any erase or program operation; floating either pin is prohibited and may cause unpredictable behavior.
Can multiple SST49LF008A-33-4C-WHE-T devices share the same FWH bus?
Yes - the SST49LF008A-33-4C-WHE-T supports multi-device bus operation via four ID pins (ID[3:0]). The boot device must be strapped to 0000; subsequent devices use sequential values (0001, 0010, etc.). During each FWH cycle, the host broadcasts an IDSEL field; only the device matching its ID[3:0] strapping responds, enabling up to 16 devices on one bus without external decoding logic.
What is the purpose of the FGPI[4:0] pins on the SST49LF008A-33-4C-WHE-T?
The FGPI[4:0] pins on the SST49LF008A-33-4C-WHE-T are five general-purpose input pins whose states are captured at power-up and made readable via the memory-mapped GPI_REG register at address FFBC0100H. They provide board-level configuration flexibility - such as jumperless feature enable/disable - without requiring additional GPIO expanders or microcontroller resources.
Does the SST49LF008A-33-4C-WHE-T support chip-erase in FWH mode?
No - chip-erase is only available in Parallel Programming (PP) mode for the SST49LF008A-33-4C-WHE-T. In FWH mode, supported erase operations are limited to uniform 4 KB sectors and 64 KB overlay blocks. This restriction ensures safe, granular firmware updates in live systems without risking full BIOS corruption during in-field operations.
SST49LF008A-33-4C-WHE-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- SST49
- 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
- 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:
- 32-TSOP
SST49LF008A-33-4C-WHE-T FAQ
1.How can I place an order for SST49LF008A-33-4C-WHE-T through Aetrix?
Please submit a Request for Quotation (RFQ) for SST49LF008A-33-4C-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 SST49LF008A-33-4C-WHE-T reliable?
The price and inventory of SST49LF008A-33-4C-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 SST49LF008A-33-4C-WHE-T is usually 5 days.
3.What payment methods are accepted for SST49LF008A-33-4C-WHE-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST49LF008A-33-4C-WHE-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST49LF008A-33-4C-WHE-T?
SST49LF008A-33-4C-WHE-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST49LF008A-33-4C-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 SST49LF008A-33-4C-WHE-T?
For technical support, including SST49LF008A-33-4C-WHE-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-WHE-T requirements.
6.How does Aetrix verify that SST49LF008A-33-4C-WHE-T is sourced from the original manufacturer or authorized distributors?
All SST49LF008A-33-4C-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 SST49LF008A-33-4C-WHE-T meets industry standards.
7.What is the process for return or replacement of SST49LF008A-33-4C-WHE-T?
All SST49LF008A-33-4C-WHE-T units undergo pre-shipment inspection (PSI). If there is an issue with SST49LF008A-33-4C-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 SST49LF008A-33-4C-WHE-T part is unused and in its original packaging.
Return procedure for SST49LF008A-33-4C-WHE-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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