My Inquiry
My Account
Microchip Technology SST49LF008A-33-4C-WHE
- Part No.:
- SST49LF008A-33-4C-WHE
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
SST49LF008A-33-4C-WHE.pdf
- Description:
- IC FLASH 8MBIT PAR 33MHZ 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:324
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SST49LF008A-33-4C-WHE 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# pins, and dual-mode operation (FWH interface at 33 MHz or Parallel Programming mode). 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-WHE datasheet, SST49LF008A-33-4C-WHE pinout, SST49LF008A-33-4C-WHE application, or SST49LF008A-33-4C-WHE equivalent, key selection considerations include FWH protocol compliance, boot-block hardware lock behavior, 32-lead TSOP package mapping, SuperFlash energy efficiency, and ID[3:0]/FGPI[4:0] system integration flexibility.
Technical Context
The SST49LF008A-33-4C-WHE implements a split-gate SuperFlash cell architecture enabling fixed erase/program timing independent of cycle count. It supports two mutually exclusive interface modes: Firmware Hub (FWH) mode using 5-signal I/O (FWH[3:0], FWH4) with 33 MHz clock and Intel-compatible command set, and Parallel Programming (PP) mode using 11-pin multiplexed address and 8-bit data bus.
Hardware protection is implemented through dedicated pins - WP# prevents programming to non-boot blocks, TBL# protects the top 64 KB boot block - both OR'ed with corresponding software Block Locking Registers. The IC pin selects mode at power-up, and ID[3:0] enables 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 operation eliminates level-shifting in legacy PC platforms |
| FWH Clock Frequency | 33 MHz - matches Intel ICH timing requirements for in-system firmware updates |
| Endurance | 100,000 cycles (typical) - sufficient for field firmware patching over product lifetime |
| Data Retention | >100 years - ensures BIOS integrity across extended deployment without refresh |
| Erase Granularity | Uniform 4 KB sectors and 64 KB overlay blocks - enables fine-grained BIOS module updates |
| Write Protection | Dual-layer: hardware (WP#, TBL#) + software (Block Locking Registers) - prevents accidental corruption during boot or update |
Pinout & Package
Package: 32-lead TSOP (8 mm × 14 mm), RoHS-compliant, lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power Supply / Ground | Single 3.0–3.6 V rail; all VSS pins must be grounded for stable FWH timing and noise immunity |
| FWH[3:0], FWH4 | FWH Interface I/O | 4-bit bidirectional data + control signal - implements Intel FWH protocol for BIOS read/write without external logic |
| CLK (R/C#) | Clock Input / Row-Column Select | In FWH mode: 33 MHz clock input; in PP mode: address multiplexing control for factory programming |
| WP#, TBL# | Hardware Write Protect | Active-low pins - TBL# locks top 64 KB boot block; WP# locks remaining sectors; both must be driven, not floated |
| ID[3:0] | Device Identification | Strap inputs for multi-chip bus arbitration - boot device requires ID[3:0]=0000; enables up to 16 devices on same FWH bus |
| FGPI[4:0] | General Purpose Inputs | Five configurable board-level inputs readable via GPI_REG register - adds system-level configuration flexibility without extra GPIOs |
Key Features
| Feature | Design Value |
|---|---|
| Firmware Hub (FWH) Mode | Native Intel 82802-compatible interface - eliminates need for translation logic in legacy chipset designs |
| SuperFlash Technology | Fixed 18 ms sector/block erase time - removes software calibration for aging compensation required by conventional flash |
| Dual Protection Architecture | Hardware (WP#/TBL#) + software (Block Locking Registers) - provides redundant, layered BIOS security against corruption |
| Multi-Device Bus Support | ID[3:0] strapping + FWH protocol - allows scalable BIOS expansion across multiple flash devices on one bus |
| Status Detection | Data# Polling (DQ7) and Toggle Bit (DQ6) - enables efficient polling-based firmware update without interrupt overhead |
Applications
| PC BIOS Storage | Industrial Control Firmware |
|---|---|
Use Scenario: Storing and updating core system BIOS code in desktop, server, and embedded x86 platforms with Intel 8xx/ICH chipsets. IC Role / Device Role / Timing Role: Firmware Hub replacement for Intel 82802 - provides read-compatible, in-system programmable nonvolatile storage with FWH protocol timing. Use Value: Enables secure, field-upgradable BIOS with hardware-locked boot block and 100-year data retention - critical for long-lifecycle deployments. | Use Scenario: Hosting firmware images for programmable logic controllers (PLCs), HMIs, and industrial gateways requiring certified, tamper-resistant code storage. IC Role / Device Role / Timing Role: Secure boot memory with dual hardware/software write protection - ensures firmware integrity during power cycling and remote updates. Use Value: Prevents unauthorized modification via WP#/TBL# pins and Block Locking Registers - meets IEC 62443 functional safety requirements for firmware immutability. |
| Legacy Platform Refresh | Multi-Device Boot Configuration |
Use Scenario: Replacing obsolete FWH parts in end-of-life motherboards while maintaining full compatibility with existing BIOS and chipset drivers. IC Role / Device Role / Timing Role: Drop-in read-compatible replacement - preserves identical FWH command sequences, timing, and pinout in 32-lead TSOP footprint. Use Value: Eliminates PCB redesign and qualification effort - reduces time-to-market for platform sustainment programs. | Use Scenario: Configuring hierarchical boot sequences across multiple flash devices sharing a single FWH bus in modular computing systems. IC Role / Device Role / Timing Role: Multi-drop FWH node with ID[3:0] strapping - enables selective addressing and parallel firmware loading in complex boot architectures. Use Value: Supports scalable BIOS partitioning (e.g., base firmware + option ROMs) without additional bus controllers or address decoders. |
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 W39V080FAAIG | Same 8 Mbit density, 32-lead TSOP, FWH-compatible but lacks FGPI[4:0] and ID[3:0] multi-device support | Supports basic BIOS storage but no system-level GPIO or multi-chip arbitration | Select when only core FWH functionality is needed and board design does not require extended configuration inputs |
| Macronix MX29LV800CTTI-70G | 8 Mbit CFI-compliant parallel flash - no native FWH interface; requires external logic for Intel chipset compatibility | Used in non-FWH platforms or where custom firmware interface is acceptable | Select only if redesigning host interface logic is feasible and FWH protocol compliance is not mandatory |
Compared with W39V080FAAIG, SST49LF008A-33-4C-WHE adds five general-purpose inputs and four ID pins for system configurability and multi-device scalability; compared with MX29LV800CTTI-70G, it eliminates external interface logic by delivering native FWH timing and command set - reducing BOM cost and layout complexity in Intel-based platforms.
Availability
SST49LF008A-33-4C-WHE is available at Aetrix Electronics and suitable for PC motherboard BIOS, industrial control firmware, and legacy platform refresh requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for SST49LF008A-33-4C-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 is a global provider of microcontrollers, analog components, and memory solutions, acquired Silicon Storage Technology (SST) in 2010 to expand its nonvolatile memory portfolio.
The SST49LF008A-33-4C-WHE belongs to the Firmware Hub flash memory product line, engineered specifically for Intel chipset-based BIOS storage with emphasis on in-system programmability, hardware write protection, and long-term reliability in mission-critical boot applications.
FAQ
What interface modes does the SST49LF008A-33-4C-WHE support?
The SST49LF008A-33-4C-WHE supports two distinct interface modes: Firmware Hub (FWH) mode using a 5-signal interface (FWH[3:0], FWH4) at 33 MHz for in-system BIOS updates, and Parallel Programming (PP) mode using multiplexed 11-bit address and 8-bit data lines for high-speed factory programming. Mode selection is controlled by the IC pin at power-up.
How does hardware write protection work on the SST49LF008A-33-4C-WHE?
The SST49LF008A-33-4C-WHE uses two dedicated hardware pins: WP# prevents programming to all non-boot sectors, and TBL# protects the top 64 KB boot block. Both pins are internally OR'ed with corresponding software Block Locking Registers - meaning either hardware or software lock activation fully disables writes to the targeted region. Neither pin may be left unconnected.
Is the SST49LF008A-33-4C-WHE compatible with Intel 82802 Firmware Hub?
Yes, the SST49LF008A-33-4C-WHE is explicitly designed for read-compatibility with the Intel 82802 Firmware Hub device in PC-BIOS applications. It implements the same FWH protocol, timing, command set (including SDP), and pinout in 32-lead TSOP, enabling direct replacement without changes to host firmware or hardware design.
What is the purpose of the ID[3:0] and FGPI[4:0] pins on the SST49LF008A-33-4C-WHE?
ID[3:0] are strap inputs enabling multi-device bus arbitration in FWH mode - the boot device must be set to 0000, with subsequent devices using sequential values (0001, 0010, etc.). FGPI[4:0] are five general-purpose inputs readable via the GPI_REG register at FFBC0100H, providing board-level configuration signals without consuming host GPIO resources.
Does the SST49LF008A-33-4C-WHE support chip-erase functionality?
Chip-erase is supported only in Parallel Programming (PP) mode, not in Firmware Hub (FWH) mode. In FWH mode, the device supports sector-erase (4 KB), block-erase (64 KB), and top-boot-block protection, but chip-erase is disabled to prevent accidental full-BIOS deletion during in-system updates - enhancing field reliability.
SST49LF008A-33-4C-WHE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- SST49
- 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:
- 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 FAQ
1.How can I place an order for SST49LF008A-33-4C-WHE through Aetrix?
Please submit a Request for Quotation (RFQ) for SST49LF008A-33-4C-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 SST49LF008A-33-4C-WHE reliable?
The price and inventory of SST49LF008A-33-4C-WHE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SST49LF008A-33-4C-WHE is usually 5 days.
3.What payment methods are accepted for SST49LF008A-33-4C-WHE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST49LF008A-33-4C-WHE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST49LF008A-33-4C-WHE?
SST49LF008A-33-4C-WHE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST49LF008A-33-4C-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 SST49LF008A-33-4C-WHE?
For technical support, including SST49LF008A-33-4C-WHE 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 requirements.
6.How does Aetrix verify that SST49LF008A-33-4C-WHE is sourced from the original manufacturer or authorized distributors?
All SST49LF008A-33-4C-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 SST49LF008A-33-4C-WHE meets industry standards.
7.What is the process for return or replacement of SST49LF008A-33-4C-WHE?
All SST49LF008A-33-4C-WHE units undergo pre-shipment inspection (PSI). If there is an issue with SST49LF008A-33-4C-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 SST49LF008A-33-4C-WHE part is unused and in its original packaging.
Return procedure for SST49LF008A-33-4C-WHE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SST49LF008A-33-4C-WHE Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
