My Inquiry
My Account
Microchip Technology SST49LF008A-33-4C-NHE
- Part No.:
- SST49LF008A-33-4C-NHE
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
SST49LF008A-33-4C-NHE.pdf
- Description:
- IC FLASH 8MBIT PAR 33MHZ 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:384
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SST49LF008A-33-4C-NHE 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 and Parallel Programming). It operates from a single 3.0–3.6 V supply, supports 33 MHz clocked FWH interface, and delivers 100,000 program/erase cycles with >100-year data retention.
For engineers reviewing the SST49LF008A-33-4C-NHE datasheet, SST49LF008A-33-4C-NHE pinout, SST49LF008A-33-4C-NHE application, or SST49LF008A-33-4C-NHE 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 sockets.
Technical Context
The SST49LF008A-33-4C-NHE implements a dual-interface architecture: Firmware Hub (FWH) mode uses a 5-signal, 33 MHz synchronous bus (FWH[3:0], FWH4, CLK) with 28-bit address fields and single-byte transfers per cycle; Parallel Programming (PP) mode employs multiplexed 11-bit address (A10–A0) and 8-bit data (DQ7–DQ0) with R/C# row/column control. Both modes share hardware write-protection logic tied to WP# (full chip) and TBL# (top 64 KB boot block).
Its SuperFlash technology features split-gate cells and thick-oxide tunneling, enabling fixed 18 ms sector/block erase times and 14 µs byte-program time independent of cumulative endurance cycles - eliminating software calibration required by conventional flash. The device integrates five general-purpose inputs (FGPI[4:0]), four ID pins (ID[3:0]), and register-mapped block locking (FFBx0002H addresses) for system-level flexibility in BIOS update and configuration management.
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 voltage translators in 3.3 V systems |
| FWH Clock Frequency | 33 MHz - matches Intel ICH timing requirements for seamless FWH protocol compliance |
| Endurance | 100,000 program/erase cycles - supports frequent BIOS updates over product lifetime |
| Data Retention | >100 years - ensures firmware integrity across extended deployment without refresh |
| Sector Erase Time | 18 ms typical - enables fast partial BIOS patching without full chip erase |
| Byte Program Time | 14 µs typical - minimizes latency during small-code updates or configuration writes |
| Active Read Current | 6 mA typical - reduces power budget impact during boot-time BIOS fetches |
Pinout & Package
Package: 32-lead TSOP (8 mm × 14 mm), RoHS-compliant, lead-free (NHE suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A10 | Address Inputs | Low-order address lines latched internally during PP mode; mapped to FGPI4–FGPI0 in FWH mode |
| DQ0–DQ7 | Data I/O | Bi-directional data bus; DQ7/DQ6 provide Data# Polling and Toggle Bit status during writes |
| FWH[3:0], FWH4 | FWH Interface Signals | 4-bit I/O + strobe for Intel FWH protocol; replace parallel address/data in FWH mode |
| IC | Interface Configuration | Logic high = PP mode; logic low = FWH mode; internal 20–100 kΩ pull-down |
| WP#, TBL# | Hardware Write Protect | WP# locks all sectors except top boot block; TBL# locks top 64 KB; both must be stable during erase/program |
| ID[3:0] | Device Identification | Strap-selectable IDs (0000 = boot device); enable multi-chip FWH bus sharing |
| FGPI[4:0] | General Purpose Inputs | Read via GPI_REG at FFBC0100H; used for board-specific configuration detection |
| RST#, INIT# | Reset Inputs | Functionally identical; drive low to abort operations and place outputs in high-Z state |
Key Features
| Feature | Design Value |
|---|---|
| Firmware Hub Interface Mode | Full Intel 82802 FWH read-compatibility with 5-signal, 33 MHz synchronous bus - enables drop-in replacement in existing chipset designs |
| SuperFlash Technology | Fixed 18 ms erase and 14 µs program times regardless of endurance wear - removes runtime calibration overhead in BIOS update firmware |
| Flexible Hardware Protection | Independent WP# (full chip) and TBL# (top 64 KB) pins with OR'ed register lock - prevents accidental corruption of boot code and critical firmware |
| Multi-Device Bus Support | ID[3:0] strapping and FWH address mapping allow up to 16 SST49LF008A devices on one bus - simplifies modular BIOS partitioning in server platforms |
| Parallel Programming Mode | 11-pin multiplexed address + 8-bit data interface - enables high-throughput factory programming without FWH host controller dependency |
Applications
| PC-BIOS Storage | Server Platform Firmware |
|---|---|
Use Scenario: Storing and updating core BIOS/UEFI firmware in desktop motherboards with Intel 8xx-series chipsets. IC Role / Device Role / Timing Role: Firmware Hub (FWH) interface flash memory serving as primary nonvolatile boot code repository with Intel FWH protocol timing compliance. Use Value: Enables in-system BIOS updates via standard FWH commands while maintaining hardware write protection for boot sectors against malware or misconfiguration. | Use Scenario: Hosting platform initialization firmware, BMC boot images, and secure boot keys in dual-socket x86 servers. IC Role / Device Role / Timing Role: Dual-mode flash IC supporting both FWH runtime access and parallel programming for high-volume manufacturing provisioning. Use Value: Allows field-upgradable firmware partitions with independent lock control (TBL#/WP#) and multi-device ID strapping for redundant firmware banks. |
| Industrial Control BIOS | Embedded System Boot Loader |
Use Scenario: Providing robust, long-life firmware storage in fanless industrial PCs operating in wide-temperature environments. IC Role / Device Role / Timing Role: High-reliability SuperFlash memory with >100-year data retention and 100,000-cycle endurance for unattended operation. Use Value: Eliminates need for periodic firmware refresh; fixed erase/program timing ensures deterministic update windows in real-time control systems. | Use Scenario: Boot loader storage in headless embedded systems where BIOS compatibility is not required but FWH-like command efficiency is beneficial. IC Role / Device Role / Timing Role: Configurable flash memory using FWH mode for compact command set or PP mode for standalone programming via microcontroller GPIO. Use Value: Reduces firmware update complexity through SDP-compatible commands and status polling (DQ7/DQ6), avoiding custom driver development. |
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; 3.3 V only; no FGPI or ID pins; lacks TBL# pin and top-boot hardware lock | Supports basic FWH read/write but lacks multi-device ID strapping and dedicated boot-block hardware protection | Select when cost sensitivity outweighs need for boot-sector hardware lock or system-level GPIO inputs |
| Macronix MX29LV800CTTI-70G | 8 Mbit CFI-compliant flash; 3.0–3.6 V; parallel-only interface; no FWH mode or clock input | Requires external controller for command sequencing; no native Intel FWH timing or protocol support | Select when legacy parallel programming infrastructure exists and FWH integration is unnecessary |
Compared with W39V080FAZ and MX29LV800CTTI-70G, the SST49LF008A-33-4C-NHE uniquely combines Intel FWH protocol compliance, hardware boot-block protection (TBL#), five general-purpose inputs, and multi-device ID strapping - making it the only option for systems requiring certified BIOS replacement with enhanced security and configurability.
Availability
SST49LF008A-33-4C-NHE is available at Aetrix Electronics and suitable for PC-BIOS storage, server platform firmware, industrial control BIOS, and embedded system boot loader applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant TSOP packaging.
Supply support for SST49LF008A-33-4C-NHE 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 delivering smart, connected, and secure embedded control solutions, with leadership in microcontrollers, analog, FPGA, and memory products.
The SST49LF008A-33-4C-NHE belongs to Microchip's Firmware Hub flash memory product line, engineered specifically for Intel-platform BIOS/UEFI storage with emphasis on protocol compatibility, hardware security, and manufacturing flexibility across desktop, server, and industrial applications.
FAQ
What interface modes does the SST49LF008A-33-4C-NHE support, and how is mode selection controlled?
The SST49LF008A-33-4C-NHE supports two interface modes: Firmware Hub (FWH) mode for in-system operation and Parallel Programming (PP) mode for factory programming. Mode selection is controlled by the IC (Interface Configuration) pin: logic low selects FWH mode, logic high selects PP mode. The IC pin has an internal 20–100 kΩ pull-down resistor, so it defaults to FWH mode if left unconnected. This dual-mode capability allows the same SST49LF008A-33-4C-NHE part to serve both runtime BIOS access and high-speed manufacturing programming.
How does hardware write protection work on the SST49LF008A-33-4C-NHE, and what is the role of WP# and TBL# pins?
The SST49LF008A-33-4C-NHE implements hardware write protection using two dedicated pins: WP# (Write Protect) and TBL# (Top Block Lock). WP# prevents programming to all sectors except the top 64 KB boot block when asserted low; TBL# prevents programming to the top 64 KB boot block only when asserted low. Both pins are OR'ed with corresponding software lock bits in the Block Locking Registers, meaning hardware assertion overrides software unlock. Neither pin may be left unconnected - both must be actively driven to their required logic level before initiating any erase or program operation. This dual-layer protection ensures robust defense against accidental or malicious firmware corruption in the SST49LF008A-33-4C-NHE.
What is the purpose of the ID[3:0] pins on the SST49LF008A-33-4C-NHE, and how should they be configured in a multi-device system?
The ID[3:0] pins on the SST49LF008A-33-4C-NHE enable multi-device selection on a shared FWH bus by providing a 4-bit hardware identifier. In a system with multiple SST49LF008A-33-4C-NHE devices, each must be assigned a unique ID: the boot device must use ID[3:0] = 0000, and subsequent devices should use sequential upward values (e.g., 0001, 0010, etc.). During each FWH transaction, the host sends an IDSEL field; only the SST49LF008A-33-4C-NHE with matching ID responds. Unused ID pins are internally pulled down, so explicit strapping is required for non-boot devices. This mechanism allows up to 16 SST49LF008A-33-4C-NHE parts to coexist on one bus without address conflicts.
Does the SST49LF008A-33-4C-NHE support chip-erase, and if so, under which interface mode?
Chip-erase is supported exclusively in Parallel Programming (PP) mode on the SST49LF008A-33-4C-NHE; it is not available in Firmware Hub (FWH) mode. In PP mode, chip-erase requires a specific command sequence applied via the 11-bit address and 8-bit data interface, with a typical duration of 70 ms. FWH mode supports only sector-erase (4 KB), block-erase (64 KB), and byte-program operations - consistent with Intel FWH protocol constraints. Therefore, full-chip reinitialization of the SST49LF008A-33-4C-NHE must occur during manufacturing or service programming using PP mode, not during field updates via the host chipset.
What are the key timing parameters for FWH-mode read and write operations on the SST49LF008A-33-4C-NHE?
In FWH mode, the SST49LF008A-33-4C-NHE operates at 33 MHz clock frequency with strictly defined field-based waveforms. A single-byte read requires 17 clock cycles (including START, IDSEL, 7× IMADDR, IMSIZE, TAR, RSYNC, and DATA fields); a single-byte write also requires 17 cycles (with START, IDSEL, IMADDR, IMSIZE, two DATA fields, and TAR/RSYNC). All fields are one clock cycle in length, and data is transferred most-significant-nibble first. The device enters ready mode when FWH4 is low and no activity is present; it enters standby when FWH4 is high. These precise timing sequences ensure interoperability with Intel ICH controllers and are fully documented in Tables 3 and 4 of the SST49LF008A-33-4C-NHE datasheet.
SST49LF008A-33-4C-NHE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- SST49
- Package/Case:
- 32-LCC (J-Lead)
- Packaging:
- Tube
- 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 FAQ
1.How can I place an order for SST49LF008A-33-4C-NHE through Aetrix?
Please submit a Request for Quotation (RFQ) for SST49LF008A-33-4C-NHE 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 reliable?
The price and inventory of SST49LF008A-33-4C-NHE 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 is usually 5 days.
3.What payment methods are accepted for SST49LF008A-33-4C-NHE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST49LF008A-33-4C-NHE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST49LF008A-33-4C-NHE?
SST49LF008A-33-4C-NHE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST49LF008A-33-4C-NHE 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?
For technical support, including SST49LF008A-33-4C-NHE 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 requirements.
6.How does Aetrix verify that SST49LF008A-33-4C-NHE is sourced from the original manufacturer or authorized distributors?
All SST49LF008A-33-4C-NHE 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 meets industry standards.
7.What is the process for return or replacement of SST49LF008A-33-4C-NHE?
All SST49LF008A-33-4C-NHE units undergo pre-shipment inspection (PSI). If there is an issue with SST49LF008A-33-4C-NHE, 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 part is unused and in its original packaging.
Return procedure for SST49LF008A-33-4C-NHE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SST49LF008A-33-4C-NHE 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…
