My Inquiry
My Account
Microchip Technology SST49LF080A-33-4C-WHE
- Part No.:
- SST49LF080A-33-4C-WHE
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
SST49LF080A-33-4C-WHE.pdf
- Description:
- IC FLASH 8MBIT PAR 33MHZ 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,116
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SST49LF080A-33-4C-WHE from Microchip Technology (formerly Silicon Storage Technology) is an 8 Mbit LPC interface flash memory IC designed for BIOS/firmware storage in PC and Internet appliance platforms. It delivers 1024K × 8 organization, 33 MHz LPC clock support, hardware write protection via WP# and TBL#, and operates from a single 3.0–3.6 V supply. Its dual-mode architecture supports in-system LPC operation and parallel programming for high-throughput production.
For engineers reviewing the SST49LF080A-33-4C-WHE datasheet, SST49LF080A-33-4C-WHE pinout, SST49LF080A-33-4C-WHE application, or SST49LF080A-33-4C-WHE equivalent, this page provides verified technical context, validated pin functions, confirmed LPC timing compliance, real-world boot-block protection behavior, and direct alternatives with documented functional trade-offs for legacy PC platform design and firmware update infrastructure.
Technical Context
The SST49LF080A-33-4C-WHE implements Intel LPC Interface Specification 1.0 with a 5-signal, 4-bit LAD[3:0] bus, LFRAME#, and LCLK up to 33 MHz. It uses SuperFlash® technology with split-gate cells enabling fixed 18 ms sector/block erase time independent of program/erase cycle count.
In LPC mode, it decodes 32-bit addresses with ID[3:0] strapping for multi-device selection and supports JEDEC SDP command sequences for software data protection. In Parallel Programming (PP) mode, it uses 11-pin multiplexed address (A10–A0) and 8-bit DQ[7:0] I/O with R/C# for row/column addressing - requiring no external voltage programming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 8 Mbit (1024K × 8), providing full BIOS image storage for legacy x86 platforms. |
| LPC Clock Frequency | 33 MHz maximum - matches standard LPC bus timing in Intel chipset-based motherboards. |
| Supply Voltage | 3.0–3.6 V - compatible with 3.3 V system rails without level-shifting. |
| Erase Time (Sector/Block) | 18 ms typical - enables fast firmware updates with deterministic latency. |
| Byte-Program Time | 14 µs typical - supports efficient patch-level writes during runtime firmware updates. |
| Data Retention | >100 years - ensures long-term reliability for embedded systems with infrequent reprogramming. |
| Endurance | 100,000 program/erase cycles - sufficient for field firmware upgrades over product lifetime. |
Pinout & Package
Package: 32-lead TSOP (8 mm × 14 mm), RoHS-compliant, lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LAD[3:0] | LPC Address/Data Bus | 4-bit bidirectional multiplexed bus for LPC read/write cycles and command/data transfer. |
| LCLK | LPC Clock Input | Accepts up to 33 MHz system clock; synchronizes all LPC transactions. |
| LFRAME# | LPC Frame Control | Active-low signal indicating start or abort of LPC bus cycle. |
| WP# | Hardware Write Protect | Low = prevents programming to all but top boot block; must be externally driven. |
| TBL# | Top Boot Block Lock | Low = locks 64 KB boot sectors at highest address; cannot float. |
| MODE | Interface Mode Select | Low = LPC mode (in-system); High = PP mode (production programming). |
| ID[3:0] | Device Identification | Hardware-strapped inputs enabling up to 16 devices on same LPC bus. |
| GPI[4:0] | General Purpose Inputs | Five user-configurable inputs readable via GPI_REG register for board-level status sensing. |
Key Features
| Feature | Design Value |
|---|---|
| SuperFlash® Technology | Split-gate cell with thick-oxide tunneling injector enables fixed erase/program time and >100k endurance without degradation. |
| Dual-Mode Interface | LPC mode for in-system firmware updates; PP mode for high-speed factory programming - no external HV required. |
| Hardware Write Protection | Independent WP# (full chip except boot block) and TBL# (top 64 KB boot sectors) pins prevent accidental corruption during power loss or reset. |
| Boot Block Architecture | 64 KB top-boot block with dedicated lock control allows safe BIOS recovery even if main firmware is corrupted. |
| Status Detection | Data# Polling (DQ7) and Toggle Bit (DQ6) provide software-controlled end-of-write detection without polling timers. |
Applications
| Legacy PC BIOS Storage | Internet Appliance Firmware |
|---|---|
|
Use Scenario: Storing and updating core system BIOS in desktop, server, and industrial motherboard designs compliant with Intel LPC bus architecture. IC Role / Device Role / Timing Role: Primary nonvolatile firmware storage device interfacing directly to southbridge LPC controller; handles boot code execution and runtime update requests. Use Value: Enables secure, field-upgradable BIOS with hardware-locked boot sectors - critical for system integrity and remote firmware patching. |
Use Scenario: Firmware storage in network-connected consumer devices such as set-top boxes, VoIP phones, and thin clients where compact footprint and low-power operation are essential. IC Role / Device Role / Timing Role: Embedded firmware memory accessed via LPC host controller; supports in-field updates using standard SDP commands over existing system bus. Use Value: Reduces BOM cost by eliminating separate programming interfaces; leverages existing LPC infrastructure for zero-additional-hardware firmware management. |
| Industrial Control System Boot Memory | Embedded Platform Recovery Storage |
|
Use Scenario: Storing boot loader and fail-safe recovery images in programmable logic controllers (PLCs) and human-machine interfaces (HMIs) operating in harsh environments. IC Role / Device Role / Timing Role: Nonvolatile boot memory with deterministic 18 ms erase time and >100-year data retention - ensuring reliable startup after extended storage or temperature cycling. Use Value: Guarantees system restart capability after power interruption or firmware corruption, meeting IEC 61508 SIL-2 functional safety requirements for boot integrity. |
Use Scenario: Dedicated recovery partition in embedded gateways and edge computing nodes that must restore operation after failed OTA updates or configuration errors. IC Role / Device Role / Timing Role: Isolated 64 KB top-boot block protected by TBL# pin - remains unmodified during main firmware updates and serves as last-resort boot source. Use Value: Eliminates need for external recovery mechanisms (e.g., JTAG, UART bootloader), reducing PCB area and qualification effort. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LPC flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Winbond W25Q80DVSSIG | Serial Quad SPI interface (not LPC); 8 Mbit density; requires different host driver and bus protocol stack. | Used in newer embedded designs with SPI-capable MCUs; not pin- or protocol-compatible with LPC-based chipsets. | Select only when migrating from LPC to SPI architecture - requires full firmware and hardware redesign. |
| Macronix MX25L8006EM2I-12G | Serial SPI interface; 8 Mbit; 120 MHz max clock; lacks hardware TBL#/WP# pins and LPC-specific registers (GPI_REG, JEDEC ID). | Targets cost-sensitive IoT endpoints; incompatible with legacy BIOS update toolchains expecting LPC signaling and SDP command set. | Not suitable for drop-in replacement; viable only in greenfield SPI-based designs with no LPC dependency. |
Compared with SST49LF080A-33-4C-WHE, both alternatives eliminate LPC interface complexity but forfeit direct compatibility with Intel chipset southbridge controllers, boot ROM initialization sequences, and hardware write-protection schemes - making them unsuitable for maintaining legacy PC platform firmware infrastructure.
Availability
SST49LF080A-33-4C-WHE is available at Aetrix Electronics and suitable for legacy PC motherboard manufacturing, industrial control system refurbishment, and embedded gateway firmware recovery module production requiring stable component supply and long-term lifecycle support.
Supply support for SST49LF080A-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 acquired Silicon Storage Technology (SST) in 2016 and maintains full support for the SST49LF family of LPC flash devices, including documentation, validation tools, and long-term supply commitments.
The SST49LF product line was specifically engineered for Intel LPC bus–based BIOS and firmware storage in x86 platforms, emphasizing deterministic timing, hardware write protection, and backward compatibility with legacy chipset implementations.
FAQ
What interface modes does the SST49LF080A-33-4C-WHE support?
The SST49LF080A-33-4C-WHE supports two distinct interface modes: Low Pin Count (LPC) mode for in-system firmware operations and Parallel Programming (PP) mode for high-speed factory programming. MODE pin state determines operation - low for LPC, high for PP. Both modes use the same physical package but require different signal routing and host-side logic.
Does the SST49LF080A-33-4C-WHE require external high-voltage programming?
No, the SST49LF080A-33-4C-WHE performs all program and erase operations using only the 3.0–3.6 V supply - no external VPP or high-voltage generator is needed. Its SuperFlash® technology enables single-supply operation in both LPC and PP modes, simplifying system power design and eliminating HV-related layout constraints.
How does hardware write protection work on the SST49LF080A-33-4C-WHE?
The SST49LF080A-33-4C-WHE implements dual hardware write protection: WP# pin locks all sectors except the top 64 KB boot block, while TBL# pin exclusively protects that top boot block. Both pins must be actively driven - floating either pin violates specification and may cause undefined behavior during write attempts.
Can multiple SST49LF080A-33-4C-WHE devices share the same LPC bus?
Yes, up to 16 SST49LF080A-33-4C-WHE devices can be connected to one LPC bus using ID[3:0] strapping. The boot device must be configured as ID=0000; subsequent devices use sequential IDs (0001, 0010, etc.). Address decoding is handled automatically via A24:A23 and A21:A20 bits in the LPC address cycle.
What is the purpose of the GPI[4:0] pins on the SST49LF080A-33-4C-WHE?
The GPI[4:0] pins on the SST49LF080A-33-4C-WHE are general-purpose inputs readable via the GPI_REG register at FFBC0100H (for ID=0000). They provide board-level status signals - e.g., jumper settings, voltage rail presence, or thermal alerts - accessible to host firmware without additional GPIO expanders.
SST49LF080A-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
SST49LF080A-33-4C-WHE FAQ
1.How can I place an order for SST49LF080A-33-4C-WHE through Aetrix?
Please submit a Request for Quotation (RFQ) for SST49LF080A-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 SST49LF080A-33-4C-WHE reliable?
The price and inventory of SST49LF080A-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 SST49LF080A-33-4C-WHE is usually 5 days.
3.What payment methods are accepted for SST49LF080A-33-4C-WHE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST49LF080A-33-4C-WHE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST49LF080A-33-4C-WHE?
SST49LF080A-33-4C-WHE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST49LF080A-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 SST49LF080A-33-4C-WHE?
For technical support, including SST49LF080A-33-4C-WHE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST49LF080A-33-4C-WHE requirements.
6.How does Aetrix verify that SST49LF080A-33-4C-WHE is sourced from the original manufacturer or authorized distributors?
All SST49LF080A-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 SST49LF080A-33-4C-WHE meets industry standards.
7.What is the process for return or replacement of SST49LF080A-33-4C-WHE?
All SST49LF080A-33-4C-WHE units undergo pre-shipment inspection (PSI). If there is an issue with SST49LF080A-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 SST49LF080A-33-4C-WHE part is unused and in its original packaging.
Return procedure for SST49LF080A-33-4C-WHE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SST49LF080A-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…
