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Microchip Technology SST49LF016C-33-4C-EIE-T
- Part No.:
- SST49LF016C-33-4C-EIE-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 40-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
SST49LF016C-33-4C-EIE-T.pdf
- Description:
- IC FLASH 16MBIT PAR 33MHZ 40TSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SST49LF016C-33-4C-EIE-T from Microchip is a 16 Mbit LPC Serial Flash memory IC designed for system firmware storage in host controllers supporting Low Pin Count (LPC) interface v1.1. It delivers 15.6 MB/s burst-read throughput at 33 MHz, operates from a single 3.0–3.6 V supply, and features uniform 4 KByte sectors with hardware write protection via WP#/AAI and TBL# pins - deployed in BIOS/firmware boot code storage applications.
For engineers reviewing the SST49LF016C-33-4C-EIE-T datasheet, SST49LF016C-33-4C-EIE-T pinout, SST49LF016C-33-4C-EIE-T application, or SST49LF016C-33-4C-EIE-T equivalent, this page provides verified technical context on LPC-mode timing, AAI programming support, block-locking register behavior, 5-signal bus interface constraints, and EOL-aware sourcing guidance for legacy platform sustainment.
Technical Context
The SST49LF016C-33-4C-EIE-T implements a dedicated LPC interface with five signals (LCLK, LAD[3:0], LFRAME#, RST#, INIT#) and supports Firmware Memory Read/Write cycles per LPC v1.1 - including 1/2/4/16/128-byte reads and 1/2/4-byte writes. Its internal SuperFlash technology enables fixed 18 ms sector/block erase time and 7 µs typical program time, independent of cycle count.
Hardware protection is enforced through dual independent pins: TBL# locks only the top 16 KByte boot block, while WP#/AAI controls write access to all remaining sectors. In AAI mode (enabled by 9 V on WP#/AAI), it supports rapid multi-byte programming with LD#/RY/BY# handshake, distinct from standard LPC command sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 16 Mbit (2 M × 8 organization), directly maps to 2,097,152 bytes of nonvolatile firmware storage |
| LPC Clock Frequency | 33 MHz - enables 15.6 MB/s burst-read transfer rate; required for compatibility with legacy chipset LPC buses |
| Supply Voltage | 3.0–3.6 V - single-supply operation eliminates need for voltage translation in 3.3 V system rails |
| Erase/Program Endurance | 100,000 cycles (typical) - sufficient for field firmware updates across industrial product lifecycles |
| Data Retention | Greater than 100 years - ensures BIOS/firmware integrity over full equipment service life without refresh |
| Block Architecture | 35 uniform 4 KByte sectors: one 16 KByte boot block + two 8 KByte + one 32 KByte + thirty-one 64 KByte main blocks |
| Security ID Space | 256-bit total: 64-bit factory pre-programmed unique device ID + 192-bit user-programmable OTP for authentication |
Pinout & Package
Package: 32-lead PLCC (Plastic Leaded Chip Carrier), 11.43 mm × 13.97 mm footprint, through-hole mountable - compatible with legacy socketed BIOS programming fixtures and rework workflows.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LCLK | Input clock | Synchronizes all LPC transactions; must be stable during RST#/INIT# assertion and Erase/Program operations |
| LAD[3:0] | Bidirectional address/data bus | Serial 4-bit multiplexed channel for START/IDSEL/MADDR/MSIZE/DATA fields - requires precise timing alignment per LPC v1.1 |
| LFRAME# | Frame control input | Active-low signal initiating or aborting LPC cycles; rising edge captures START field (e.g., 1101 = Firmware Read) |
| WP#/AAI | Multi-function input | At 3.3 V: enables hardware write protection; at 9 V: enters Auto Address Increment programming mode |
| TBL# | Top block lock input | Active-low hardware lock for 16 KByte boot block - overrides software locking registers when asserted |
| ID[3:0] | Device identification inputs | Strapped binary address (0000 = boot device) enabling up to 16 devices on shared LPC bus |
| GPI[4:0] | General-purpose inputs | Five digital inputs readable via LPC registers - used for board-level configuration detection or status feedback |
| RY/BY# | Open-drain ready/busy flag | Signals completion of internal operations; behavior switches between "buffer free" and "programming complete" based on LD# state |
| LD# | Load-enable input | Controls RY/BY# flag mode in AAI mode - low = loading data, high = terminating command |
| RST# / INIT# | Reset inputs | Dual active-low reset pins internally OR'd - required to be held low ≥ TRSTP during power-up or recovery |
Key Features
| Feature | Design Value |
|---|---|
| LPC v1.1 compliance | Reduces host controller pin count from 28 (parallel flash) to 5 signals - lowers ASIC cost and simplifies PCB routing |
| Auto Address Increment (AAI) | Enables rapid factory programming at 9 V on WP#/AAI - achieves ~4 s full-chip rewrite vs. standard LPC command overhead |
| Hardware block protection | Independent TBL# (top boot block) and WP#/AAI (remaining sectors) pins - prevents accidental firmware corruption during field updates |
| Program/Erase suspend | Allows read access to unlocked blocks during active Program/Erase - supports real-time diagnostics without halting firmware execution |
| Security ID space | 256-bit OTP-capable identifier - supports secure boot chain validation and device-specific firmware binding |
Applications
| BIOS Firmware Storage | Embedded Controller Boot Code |
|---|---|
|
Use Scenario: Storing x86-compatible BIOS/UEFI firmware images in desktop, server, and industrial motherboards. IC Role / Device Role / Timing Role: Nonvolatile firmware memory accessed via LPC bus during CPU reset sequence and POST initialization. Use Value: 33 MHz LPC timing matches legacy chipset requirements; 16 Mbit capacity accommodates feature-rich UEFI implementations with capsule updates. |
Use Scenario: Hosting boot loader and runtime firmware for embedded controllers (ECs) in laptops and thin clients. IC Role / Device Role / Timing Role: Primary firmware store interfaced directly to EC's LPC master - supports fast resume-from-suspend code fetch. Use Value: Uniform 4 KByte sectors enable atomic update of EC microcode patches; hardware write protection prevents corruption during power-loss events. |
| Industrial PLC Configuration Storage | Legacy Server Management Engine (ME) Image |
|
Use Scenario: Retaining configuration parameters, calibration data, and safety-critical logic in programmable logic controllers. IC Role / Device Role / Timing Role: Persistent storage element accessed over LPC by real-time OS or bare-metal firmware during startup and runtime. Use Value: 100-year data retention ensures parameter integrity across 15+ year deployments; GPI[4:0] inputs allow hardware-strapped configuration modes. |
Use Scenario: Storing Intel Management Engine firmware images in enterprise servers requiring out-of-band management. IC Role / Device Role / Timing Role: Secondary firmware repository isolated from main BIOS flash - accessed exclusively by ME processor over dedicated LPC link. Use Value: Dual ID[3:0] strapping enables coexistence with primary BIOS flash on same LPC bus; security ID supports ME image signature verification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LPC serial flash applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Winbond W25Q16DVSSIG | Quad SPI interface (not LPC); 3.3 V only; no TBL#/WP# hardware lock pins; lacks AAI mode and ID[3:0] multi-device support | Requires SPI host controller redesign; unsuitable for legacy LPC-based chipsets; no boot-block isolation capability | Select only if migrating to modern SPI-based firmware architecture with updated BIOS/EC firmware stack |
| Macronix MX25L1606EM2I-12G | Standard SPI interface; 3.3 V; no LPC signaling or ID[3:0]/GPI pins; lacks hardware top-block lock and AAI programming mode | Cannot replace SST49LF016C-33-4C-EIE-T on existing LPC bus without bridge IC or host controller modification | Consider only for new designs where SPI is preferred and LPC compatibility is not required |
Compared with Winbond W25Q16DVSSIG and Macronix MX25L1606EM2I-12G, the SST49LF016C-33-4C-EIE-T uniquely delivers native LPC v1.1 compliance, hardware boot-block protection, and AAI factory programming - making it irreplaceable in legacy x86 platform sustainment without board-level redesign.
Availability
SST49LF016C-33-4C-EIE-T is available at Aetrix Electronics and suitable for BIOS firmware storage, embedded controller boot code, industrial PLC configuration retention, and legacy server management engine image deployment requiring stable component supply amid end-of-life transitions.
Supply support for SST49LF016C-33-4C-EIE-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 devices, and memory solutions - acquired SST in 2010 to expand its serial flash portfolio.
The SST49LF016C product line was developed specifically for LPC-based system firmware applications in x86 platforms, emphasizing compatibility with legacy chipsets, robust write protection, and factory programming efficiency using SuperFlash technology.
FAQ
What does the "-33-4C-EIE-T" suffix indicate for SST49LF016C-33-4C-EIE-T?
The "-33-4C-EIE-T" suffix specifies key operational and packaging attributes of the SST49LF016C-33-4C-EIE-T: "33" denotes 33 MHz maximum LPC clock frequency; "4C" indicates commercial temperature range (0°C to +70°C); "EIE" identifies the 32-lead PLCC package with lead-free (Pb-free) and RoHS-compliant finish; and "T" signifies tape-and-reel packaging for automated assembly. These identifiers confirm the device meets legacy platform timing and mechanical requirements.
Is SST49LF016C-33-4C-EIE-T still in production or marked obsolete?
Yes, SST49LF016C-33-4C-EIE-T is an obsolete (EOL) device per Microchip's DS20005029B datasheet dated February 2016. Microchip recommends contacting its sales team for replacement guidance. However, Aetrix Electronics maintains active inventory and supply-chain continuity support for this part to serve ongoing maintenance and repair needs in deployed systems.
Can SST49LF016C-33-4C-EIE-T operate at 66 MHz LPC clock speed?
No - the SST49LF016C-33-4C-EIE-T is rated for 33 MHz LPC operation only. While the base SST49LF016C family includes a -66 variant supporting 66 MHz (31.2 MB/s burst-read), the "-33" suffix in SST49LF016C-33-4C-EIE-T explicitly limits it to 33 MHz timing. Using it with a 66 MHz LPC clock violates specification and risks unreliable read/write behavior or command timeout failures.
How does hardware write protection work on SST49LF016C-33-4C-EIE-T?
SST49LF016C-33-4C-EIE-T implements two independent hardware write protection mechanisms: TBL# pin locks only the top 16 KByte boot block when pulled low, and WP#/AAI pin protects all other sectors when pulled low. Both pins override corresponding software locking registers - meaning hardware assertion takes precedence, ensuring firmware integrity even if register settings are corrupted.
What is the purpose of the GPI[4:0] pins on SST49LF016C-33-4C-EIE-T?
The GPI[4:0] pins on SST49LF016C-33-4C-EIE-T provide five general-purpose digital inputs readable via LPC registers - used for board-level configuration detection (e.g., jumperless SKU selection), hardware revision identification, or status monitoring. They must be driven to defined logic levels (not floated), and GPI[2:4] are ignored during AAI programming mode per the datasheet.
SST49LF016C-33-4C-EIE-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- SST49
- Package/Case:
- 40-TFSOP (0.724", 18.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 16Mbit
- Memory Organization:
- 2M x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- 33 MHz
- Write Cycle Time - Word, Page:
- 10µs
- Access Time:
- -
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- 0°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-TSOP
SST49LF016C-33-4C-EIE-T FAQ
1.How can I place an order for SST49LF016C-33-4C-EIE-T through Aetrix?
Please submit a Request for Quotation (RFQ) for SST49LF016C-33-4C-EIE-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 SST49LF016C-33-4C-EIE-T reliable?
The price and inventory of SST49LF016C-33-4C-EIE-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SST49LF016C-33-4C-EIE-T is usually 5 days.
3.What payment methods are accepted for SST49LF016C-33-4C-EIE-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST49LF016C-33-4C-EIE-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST49LF016C-33-4C-EIE-T?
SST49LF016C-33-4C-EIE-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST49LF016C-33-4C-EIE-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 SST49LF016C-33-4C-EIE-T?
For technical support, including SST49LF016C-33-4C-EIE-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST49LF016C-33-4C-EIE-T requirements.
6.How does Aetrix verify that SST49LF016C-33-4C-EIE-T is sourced from the original manufacturer or authorized distributors?
All SST49LF016C-33-4C-EIE-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 SST49LF016C-33-4C-EIE-T meets industry standards.
7.What is the process for return or replacement of SST49LF016C-33-4C-EIE-T?
All SST49LF016C-33-4C-EIE-T units undergo pre-shipment inspection (PSI). If there is an issue with SST49LF016C-33-4C-EIE-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 SST49LF016C-33-4C-EIE-T part is unused and in its original packaging.
Return procedure for SST49LF016C-33-4C-EIE-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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