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Microchip Technology SST49LF008A-33-4C-NHE-T
- Part No.:
- SST49LF008A-33-4C-NHE-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
SST49LF008A-33-4C-NHE-T.pdf
- Description:
- IC FLASH 8MBIT PAR 33MHZ 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,144
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Product details
Overview
SST49LF008A-33-4C-NHE-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 under single 3.0–3.6 V supply.
For engineers reviewing the SST49LF008A-33-4C-NHE-T datasheet, SST49LF008A-33-4C-NHE-T pinout, SST49LF008A-33-4C-NHE-T application, or SST49LF008A-33-4C-NHE-T equivalent, this page provides verified technical context, validated pin functions for 32-lead TSOP, confirmed FWH/PP mode behavior, real-world BIOS update timing metrics, and two manufacturer-validated alternative parts with documented functional trade-offs.
Technical Context
The SST49LF008A-33-4C-NHE-T implements a SuperFlash split-gate cell architecture enabling fixed 18 ms sector/block erase and 14 µs byte-program times independent of accumulated cycles-eliminating software calibration required by conventional flash. Its dual-interface design supports in-system firmware updates via 5-signal FWH protocol (FWH[3:0] + FWH4, 33 MHz clock) and high-speed factory programming via 11-pin multiplexed address/8-bit data PP mode.
Hardware protection is enforced through dedicated pins: WP# disables writes to all but top Boot Block sectors, while TBL# locks the 64 KB top boot block; both are OR'ed with corresponding Block Locking Registers (e.g., T_BLOCK_LK at FFBF0002H). Five GPI inputs (FGPI[4:0]) provide system-level flexibility, readable via GPI_REG at FFBC0100H in boot-device configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 8 Mbit (1024K × 8) - supports full PC-BIOS image storage with margin for future revisions. |
| Supply Voltage | 3.0–3.6 V - single-rail operation compatible with standard 3.3 V logic and PCI I/O interfaces. |
| FWH Clock Frequency | 33 MHz - matches Intel 8xx chipset timing requirements for seamless BIOS read/write cycles. |
| Endurance | 100,000 cycles (typical) - enables frequent field firmware updates without premature wear-out. |
| Data Retention | >100 years - ensures BIOS integrity across product lifetime without refresh. |
| Active Read Current | 6 mA (typical) - low power draw during boot-time BIOS fetch sequences. |
| Standby Current | 10 µA (typical) - minimal quiescent load during system sleep states. |
Pinout & Package
Package: 32-lead TSOP (8 mm × 14 mm), RoHS-compliant, lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A10 | Address Input | Low-order address lines latched internally during FWH/PP operations; A10 maps to FGPI4 in FWH mode. |
| DQ0–DQ7 | Data I/O | Bi-directional data bus; DQ7/DQ6 support Data# Polling and Toggle Bit status detection for write completion. |
| FWH[3:0], FWH4 | FWH Interface Signals | 4-bit bidirectional data + control channel for Intel FWH protocol; requires strict 7-cycle address field sequence. |
| IC | Interface Configuration | Logic-high selects Parallel Programming mode; logic-low enables Firmware Hub mode; internal 20–100 kΩ pull-down. |
| WP#, TBL# | Hardware Write Protect | WP# guards non-boot sectors; TBL# locks top 64 KB boot block; both must be stable during erase/program. |
| ID[3:0] | Device Identification | Strap pins for multi-device bus selection; boot device requires ID[3:0] = 0000; internally pulled down. |
| FGPI[4:0] | General Purpose Inputs | Five configurable inputs readable via GPI_REG (FFBC0100H); must be stable before FWH4 assertion. |
| RST#, INIT# | Reset Control | Active-low reset signals; functionally identical and internally combined; required for CPU initialization. |
Key Features
| Feature | Design Value |
|---|---|
| Firmware Hub Interface Mode | Intel 82802-compatible 5-signal protocol (FWH[3:0]+FWH4) enabling in-system BIOS updates without socket removal. |
| Parallel Programming Mode | 11-pin multiplexed address/8-bit data interface supporting fast factory programming with R/C# row/column select. |
| SuperFlash Technology | Split-gate cell architecture delivering fixed 18 ms erase and 14 µs program times-no cycle-dependent timing drift. |
| Hardware Write Protection | Dual-layer protection: WP# (all but top block) + TBL# (64 KB boot block), both OR'ed with Block Locking Registers. |
| Multi-Device Bus Support | ID[3:0] strapping allows up to 16 SST49LF008A devices on shared FWH bus; boot device must be ID=0000. |
Applications
| PC-BIOS Storage | Firmware Update Module |
|---|---|
|
Use Scenario: Storing and executing core system BIOS code during x86 platform boot sequence. IC Role / Device Role / Timing Role: Firmware Hub acting as primary boot memory mapped at top of 4 GB address space; responds to Intel ICH FWH cycles. Use Value: Direct read-compatibility with Intel 82802 eliminates BIOS driver rework; 33 MHz FWH clock meets chipset timing spec. |
Use Scenario: Field-upgradable embedded controller firmware in industrial PCs and thin clients. IC Role / Device Role / Timing Role: In-system programmable flash memory accessed via FWH interface during OS runtime. Use Value: Hardware write protection (WP#/TBL#) prevents accidental corruption during remote update; Data# Polling enables deterministic status detection. |
| Legacy Platform Replacement | Multi-Boot System |
|
Use Scenario: Drop-in replacement for obsolete Intel 82802AB FWH devices in legacy server motherboards. IC Role / Device Role / Timing Role: Pin- and protocol-compatible Firmware Hub providing same 8 Mbit density and FWH command set. Use Value: No PCB redesign needed; identical JEDEC ID (BFH/5AH) and SDP command support ensure BIOS compatibility. |
Use Scenario: Dual-BIOS configuration where primary and backup firmware images reside on separate SST49LF008A devices. IC Role / Device Role / Timing Role: Multi-device FWH bus participant using ID[3:0] strapping (0000/0001) for selective addressing. Use Value: ID-based arbitration enables simultaneous boot image validation and failover switching without bus contention. |
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 | Same 8 Mbit density, 33 MHz FWH interface, and 3.3 V supply; lacks FGPI[4:0] and ID[3:0] pins. | Supports basic BIOS storage but no multi-device bus or system-level GPIO extension. | Select when only core FWH functionality is required and board layout lacks routing for ID/FGPI signals. |
| Macronix MX29LV800CTTI-70G | 8 Mbit CFI-compliant flash with 70 ns access time; requires external address/data demultiplexing and no native FWH protocol. | Needs BIOS driver adaptation for CFI command set; no hardware TBL#/WP# integration for boot-block protection. | Select for cost-sensitive designs where FWH compatibility is not mandatory and parallel interface is preferred. |
Compared with SST49LF008A-33-4C-NHE-T, W39V080FAZ offers identical FWH timing but omits system-flexibility features (ID/FGPI), while MX29LV800CTTI-70G requires full CFI driver integration and lacks integrated boot-block hardware protection-making SST49LF008A-33-4C-NHE-T optimal for Intel-platform BIOS with extended system control needs.
Availability
SST49LF008A-33-4C-NHE-T is available at Aetrix Electronics and suitable for PC motherboard manufacturing, industrial BIOS update modules, and legacy platform repair requiring stable component supply with long-term lifecycle assurance.
Supply support for SST49LF008A-33-4C-NHE-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 acquired Silicon Storage Technology (SST) in 2016, integrating its SuperFlash nonvolatile memory portfolio into a broad MCU, analog, and memory solutions ecosystem.
The SST49LF008A-33-4C-NHE-T belongs to Microchip's Firmware Hub flash family, engineered specifically for Intel 8xx chipset-based PC-BIOS applications requiring robust in-system programmability, hardware write protection, and long-term data integrity.
FAQ
What interface modes does the SST49LF008A-33-4C-NHE-T support?
The SST49LF008A-33-4C-NHE-T supports two distinct interface modes: Firmware Hub (FWH) mode for in-system BIOS updates using Intel's proprietary 5-signal protocol (FWH[3:0] + FWH4), and Parallel Programming (PP) mode for high-speed factory programming via 11-pin multiplexed address/8-bit data. Mode selection is controlled by the IC pin-low for FWH, high for PP-and must be set at power-up.
How does hardware write protection work on the SST49LF008A-33-4C-NHE-T?
The SST49LF008A-33-4C-NHE-T uses two dedicated pins: WP# prevents writes to all sectors except the top 64 KB boot block, and TBL# locks that top boot block exclusively. Both pins are OR'ed with corresponding Block Locking Registers (e.g., T_BLOCK_LK), meaning hardware protection takes precedence-if either pin is low, software-unlocking has no effect. Neither pin may be left unconnected.
What is the purpose of the ID[3:0] pins on the SST49LF008A-33-4C-NHE-T?
The ID[3:0] pins enable multi-device FWH bus configurations: each SST49LF008A-33-4C-NHE-T on the bus is assigned a unique 4-bit ID via external strapping. During FWH cycles, the host sends an IDSEL field; only the device matching that ID responds. The boot device must use ID[3:0] = 0000, with subsequent devices incrementing sequentially (0001, 0010, etc.) to avoid conflicts.
Can the SST49LF008A-33-4C-NHE-T be used in systems without Intel chipsets?
Yes-the SST49LF008A-33-4C-NHE-T can operate in Parallel Programming (PP) mode on non-Intel platforms, using standard 11-bit address/8-bit data I/O with R/C# for row/column multiplexing. However, FWH mode requires strict adherence to Intel's 5-signal protocol and 33 MHz clock timing; use in non-Intel systems demands custom host controller firmware implementing the FWH field sequence (START, IDSEL, IMADDR, etc.).
What are the valid package options for the SST49LF008A-33-4C-NHE-T?
The SST49LF008A-33-4C-NHE-T is specified in three packages: 32-lead PLCC, 32-lead TSOP (8 mm × 14 mm), and 40-lead TSOP (10 mm × 20 mm). The "-NHE-T" suffix explicitly denotes the 32-lead TSOP variant with lead-free (RoHS-compliant) finish. Pin assignments differ across packages-refer to Figures 2–4 in DS25085A for exact mapping per variant.
SST49LF008A-33-4C-NHE-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- SST49
- Package/Case:
- 32-LCC (J-Lead)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- 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-PLCC (11.43x13.97)
SST49LF008A-33-4C-NHE-T FAQ
1.How can I place an order for SST49LF008A-33-4C-NHE-T through Aetrix?
Please submit a Request for Quotation (RFQ) for SST49LF008A-33-4C-NHE-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-NHE-T reliable?
The price and inventory of SST49LF008A-33-4C-NHE-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-NHE-T is usually 5 days.
3.What payment methods are accepted for SST49LF008A-33-4C-NHE-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST49LF008A-33-4C-NHE-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST49LF008A-33-4C-NHE-T?
SST49LF008A-33-4C-NHE-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST49LF008A-33-4C-NHE-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-NHE-T?
For technical support, including SST49LF008A-33-4C-NHE-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-NHE-T requirements.
6.How does Aetrix verify that SST49LF008A-33-4C-NHE-T is sourced from the original manufacturer or authorized distributors?
All SST49LF008A-33-4C-NHE-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-NHE-T meets industry standards.
7.What is the process for return or replacement of SST49LF008A-33-4C-NHE-T?
All SST49LF008A-33-4C-NHE-T units undergo pre-shipment inspection (PSI). If there is an issue with SST49LF008A-33-4C-NHE-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-NHE-T part is unused and in its original packaging.
Return procedure for SST49LF008A-33-4C-NHE-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SST49LF008A-33-4C-NHE-T Tags
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