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Microchip Technology SST49LF016C-33-4C-WHE
- Part No.:
- SST49LF016C-33-4C-WHE
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
SST49LF016C-33-4C-WHE.pdf
- Description:
- IC FLASH 16MBIT PAR 33MHZ 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,956
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Product details
Overview
SST49LF016C-33-4C-WHE from Microchip Technology is a 16 Mbit (2M × 8) LPC Serial Flash memory IC designed for system firmware storage in host controllers supporting the Low Pin Count (LPC) interface. It operates at 3.0–3.6 V, supports 33 MHz clock frequency, delivers 15.6 MB/s burst-read throughput, and features hardware write protection via WP#/AAI and TBL# pins for boot-block and main-memory sectors.
For engineers reviewing the SST49LF016C-33-4C-WHE datasheet, SST49LF016C-33-4C-WHE pinout, SST49LF016C-33-4C-WHE application, or SST49LF016C-33-4C-WHE equivalent, this device serves as a legacy LPC firmware memory solution with AAI programming mode, 256-bit Security ID, uniform 4 KByte sectors, and RoHS-compliant 40-lead TSOP packaging - critical for BIOS/UEFI, embedded controller, and industrial system firmware updates.
Technical Context
The SST49LF016C-33-4C-WHE implements a 5-signal LPC bus interface (LCLK, LAD[3:0], LFRAME#, RST#, INIT#) compliant with LPC Interface Specification v1.1, enabling firmware read/write cycles of 1–128 bytes without parallel bus overhead. Its SuperFlash technology uses split-gate cells and thick-oxide tunneling for fixed erase/program timing independent of cycle count.
It supports two operational modes: standard LPC mode (WP#/AAI at VIH/VIL) and Auto Address Increment (AAI) mode (WP#/AAI at 9 V), where multi-byte programming occurs without reissuing address commands. Block locking registers, GPI[4:0] inputs, and ID[3:0] strapping enable flexible multi-device firmware partitioning and system-level control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 16 Mbit (2,097,152 × 8 bits) - provides sufficient space for UEFI firmware images and configuration data in compact embedded systems. |
| Interface Standard | LPC v1.1 - reduces host controller pin count from 28 (parallel flash) to 5 signals, lowering ASIC cost and PCB routing complexity. |
| Burst Read Throughput | 15.6 MB/s at 33 MHz - enables fast firmware loading during boot or recovery sequences. |
| Write Protection | Hardware-based via WP#/AAI (main memory) and TBL# (16 KByte top boot block) - prevents accidental corruption of critical boot code. |
| Endurance & Retention | 100,000 program/erase cycles typical; >100 years data retention - validated for long-life industrial deployments with infrequent firmware updates. |
| Power Supply | Single 3.0–3.6 V supply - eliminates need for separate 12 V or 5 V programming voltage in-system. |
| Security ID | 256-bit space: 64-bit factory pre-programmed unique ID + 192-bit OTP - supports secure boot authentication and device binding. |
Pinout & Package
Package: 40-lead TSOP (10 mm × 20 mm), RoHS compliant, surface-mountable with standard reflow profile.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LCLK | Input clock | Synchronizes all LPC bus transactions; accepts 33 MHz system clock directly from chipset. |
| LAD[3:0] | Bidirectional address/data bus | Serially transfers START, IDSEL, MADDR, MSIZE, and data nibbles - replaces 8-bit parallel bus with 4-bit multiplexed interface. |
| LFRAME# | Frame control input | Indicates start/abort of LPC cycle; driven low by host to initiate firmware read/write operations. |
| WP#/AAI | Mode-select / write protect | At 9 V: enables AAI programming; at 3.3 V: hardware write-protects non-boot sectors - dual-function pin requiring voltage-level management. |
| TBL# | Top block lock input | Active-low hardware protection for 16 KByte boot block - must be externally pulled high or low; cannot float. |
| ID[3:0] | Device identification inputs | Strapped to select one of up to 16 devices on shared LPC bus; boot device requires ID[3:0]=0000. |
| GPI[4:0] | General-purpose inputs | Five user-configurable digital inputs readable via LPC registers - supports board-level feature differentiation or revision detection. |
| RST# / INIT# | Reset inputs | Active-low reset pins internally OR'd; ensures deterministic initialization during power-up or system recovery. |
| RY/BY# / LD# | Status flag / load control | Open-drain RY/BY# indicates AAI buffer readiness or programming completion; LD# toggles its function - essential for AAI handshake timing. |
Key Features
| Feature | Design Value |
|---|---|
| Uniform 4 KByte sector architecture | 35 overlay blocks (1×16 KB boot + 2×8 KB + 1×32 KB + 31×64 KB) - enables granular firmware update without erasing entire device. |
| Two-cycle command set | Read-Array, Read-ID, Read-Status, Program, Sector-Erase, Block-Erase executed via two sequential LPC writes - simplifies host driver implementation. |
| Program/Erase suspend | Allows read access to other blocks during active erase/program - maintains system responsiveness during background firmware operations. |
| Auto Address Increment (AAI) | Enables rapid factory programming: chip rewrite time ~4 seconds - eliminates per-byte address overhead in high-volume manufacturing. |
| Multi-byte firmware cycles | Supports 1/2/4/16/128-byte reads and 1/2/4-byte writes - optimizes bandwidth utilization for variable-length firmware payloads. |
Applications
| BIOS/UEFI Firmware Storage | Embedded Controller (EC) Code |
|---|---|
Use Scenario: Storing and executing x86 platform firmware during cold boot and runtime updates. IC Role / Device Role / Timing Role: LPC-connected serial flash providing non-volatile storage for boot ROM, microcode patches, and ACPI tables. Use Value: 15.6 MB/s burst read at 33 MHz accelerates POST execution; hardware write protection prevents corruption during power loss. |
Use Scenario: Hosting firmware for keyboard controllers, thermal managers, and battery charging logic in laptops and servers. IC Role / Device Role / Timing Role: System-side firmware memory accessed via LPC bus under EC CPU control for real-time sensor polling and actuation. Use Value: Uniform 4 KByte sectors allow safe field updates of EC code without disrupting host CPU operation. |
| Industrial PLC Boot Image | Network Appliance Configuration |
Use Scenario: Storing hardened boot images and safety-critical ladder logic in programmable logic controllers. IC Role / Device Role / Timing Role: Firmware memory with >100-year data retention and 100,000-cycle endurance for unattended 24/7 operation. Use Value: TBL# and WP#/AAI hardware locks ensure boot integrity against EMI-induced glitches or unauthorized reprogramming. |
Use Scenario: Holding configuration databases, certificate stores, and firmware overlays in enterprise switches and firewalls. IC Role / Device Role / Timing Role: Secure firmware storage leveraging 256-bit Security ID for device attestation and encrypted image verification. Use Value: 192-bit OTP space enables binding of cryptographic keys to hardware identity, preventing credential cloning across units. |
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] strapping. | Requires SPI host controller and software abstraction layer; unsuitable for direct LPC chipset replacement. | Select only if migrating to SPI-based firmware architecture with full driver redesign. |
| Macronix MX25L1606EM2I-12G | Standard SPI interface; 3.3 V; no LPC signaling, no ID[3:0], no AAI; includes QE bit and dual/quad mode support. | Cannot connect directly to LPC-capable chipsets; needs bridge IC or host firmware rewrite for interface translation. | Consider for new designs prioritizing SPI ecosystem compatibility over legacy LPC footprint. |
Compared with SST49LF016C-33-4C-WHE, both alternatives require interface-level redesign and forfeit hardware boot-block protection, AAI programming speed, and multi-device ID selection - making them non-drop-in replacements but viable for greenfield SPI-based firmware storage.
Availability
SST49LF016C-33-4C-WHE is available at Aetrix Electronics and suitable for BIOS/UEFI firmware storage, embedded controller code hosting, and industrial PLC boot image applications requiring stable component supply amid end-of-life transitions.
Supply support for SST49LF016C-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 semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with emphasis on reliability, longevity, and industrial-grade qualification.
The SST49LF016C-33-4C-WHE belongs to Microchip's legacy LPC Serial Flash product line, engineered specifically for system firmware storage in x86 platforms and embedded controllers requiring low-pin-count, high-reliability non-volatile memory.
FAQ
What interface protocol does the SST49LF016C-33-4C-WHE use?
The SST49LF016C-33-4C-WHE uses the Low Pin Count (LPC) interface per Specification v1.1, with five dedicated signals: LCLK, LAD[3:0], LFRAME#, RST#, and INIT#. It does not support SPI, I²C, or parallel interfaces. This protocol enables direct connection to Intel/AMD chipsets for BIOS/UEFI firmware storage without bus translation.
Does the SST49LF016C-33-4C-WHE support hardware write protection?
Yes, the SST49LF016C-33-4C-WHE provides dual hardware write protection: WP#/AAI pin protects all sectors except the top 16 KByte boot block, while TBL# pin exclusively protects that boot block. Both pins must be actively driven - floating is prohibited - and their states are OR'ed with corresponding block-locking registers for robust firmware integrity.
What is the purpose of the AAI mode in SST49LF016C-33-4C-WHE?
The AAI (Auto Address Increment) mode in SST49LF016C-33-4C-WHE enables rapid multi-byte programming without retransmitting addresses per byte. Activated by applying 9 V to WP#/AAI, it reduces chip rewrite time to ~4 seconds. Host uses LD# and RY/BY# for handshake, making SST49LF016C-33-4C-WHE ideal for high-volume factory programming.
Can multiple SST49LF016C-33-4C-WHE devices share the same LPC bus?
Yes, up to 16 SST49LF016C-33-4C-WHE devices can share one LPC bus using ID[3:0] strapping. The boot device must have ID[3:0]=0000; others increment sequentially (0001, 0010, etc.). During firmware cycles, the host sends an IDSEL field matching the target device's strap - unmatched devices ignore the transaction.
Is the SST49LF016C-33-4C-WHE still in production?
No, the SST49LF016C-33-4C-WHE is an obsolete (EOL) device per Microchip's DS20005029B datasheet dated February 2016. Aetrix Electronics maintains limited legacy inventory and supports continuity programs, but design-ins should consider migration paths or verified drop-in alternatives aligned with current Microchip recommendations.
SST49LF016C-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:
- 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:
- 32-TSOP
SST49LF016C-33-4C-WHE FAQ
1.How can I place an order for SST49LF016C-33-4C-WHE through Aetrix?
Please submit a Request for Quotation (RFQ) for SST49LF016C-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 SST49LF016C-33-4C-WHE reliable?
The price and inventory of SST49LF016C-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 SST49LF016C-33-4C-WHE is usually 5 days.
3.What payment methods are accepted for SST49LF016C-33-4C-WHE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST49LF016C-33-4C-WHE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST49LF016C-33-4C-WHE?
SST49LF016C-33-4C-WHE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST49LF016C-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 SST49LF016C-33-4C-WHE?
For technical support, including SST49LF016C-33-4C-WHE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST49LF016C-33-4C-WHE requirements.
6.How does Aetrix verify that SST49LF016C-33-4C-WHE is sourced from the original manufacturer or authorized distributors?
All SST49LF016C-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 SST49LF016C-33-4C-WHE meets industry standards.
7.What is the process for return or replacement of SST49LF016C-33-4C-WHE?
All SST49LF016C-33-4C-WHE units undergo pre-shipment inspection (PSI). If there is an issue with SST49LF016C-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 SST49LF016C-33-4C-WHE part is unused and in its original packaging.
Return procedure for SST49LF016C-33-4C-WHE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SST49LF016C-33-4C-WHE Tags
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