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Microchip Technology SST49LF016C-33-4C-WHE-T
- Part No.:
- SST49LF016C-33-4C-WHE-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
SST49LF016C-33-4C-WHE-T.pdf
- Description:
- IC FLASH 16MBIT PAR 33MHZ 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,907
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Product details
Overview
SST49LF016C-33-4C-WHE-T from Microchip Technology is a 16 Mbit (2M × 8) LPC Serial Flash memory IC designed for system firmware storage in host controllers supporting Low Pin Count (LPC) interface v1.1. 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-T datasheet, SST49LF016C-33-4C-WHE-T pinout, SST49LF016C-33-4C-WHE-T application, or SST49LF016C-33-4C-WHE-T equivalent, this page provides verified technical context, LPC bus timing behavior, sector-protection register mapping, AAI programming mode operation, and direct alternatives for firmware memory replacement in legacy x86 platform designs.
Technical Context
The SST49LF016C-33-4C-WHE-T implements a 5-signal LPC interface (LCLK, LAD[3:0], LFRAME#, RST#, INIT#) compliant with LPC Interface Specification v1.1, enabling firmware read/write cycles of 1/2/4/16/128 bytes at 33 MHz. Its SuperFlash split-gate technology enables fixed 18 ms sector/block erase time and 7 µs typical program time per byte - independent of accumulated program/erase cycles.
It integrates dual reset inputs (RST# and INIT#), four ID selection pins (ID[3:0]) for multi-device bus configuration, five general-purpose inputs (GPI[4:0]), and dedicated hardware protection pins (WP#/AAI, TBL#) that override software locking registers when asserted low. The device supports both LPC mode (VIL/VIH on WP#/AAI) and Auto Address Increment (AAI) mode (9 V on WP#/AAI) for rapid factory programming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 16 Mbit (2,097,152 × 8 bits); supports firmware image storage for BIOS/UEFI in embedded x86 platforms. |
| Interface Standard | LPC v1.1 compliant; uses only 5 signals (LCLK, LAD[3:0], LFRAME#, RST#, INIT#) - reduces ASIC pin count vs. parallel flash. |
| Read Throughput | 15.6 MB/s at 33 MHz; achieved via 128-byte burst reads - critical for fast boot-time firmware fetch. |
| Write Protection | Hardware-level via WP#/AAI (main memory) and TBL# (16 KB top boot block); overrides software lock registers when active. |
| Erase/Program Endurance | 100,000 cycles typical; data retention >100 years - validated for long-life industrial firmware storage. |
| 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-unique ID + 192-bit OTP area - enables secure firmware authentication and binding. |
Pinout & Package
Package: 32-lead TSOP (8 mm × 14 mm), RoHS-compliant, surface-mount. Pin assignments match Figure 4 in DS20005029B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LCLK | Input clock | Synchronizes all LPC bus operations; accepts 33 MHz system clock from chipset - no internal PLL required. |
| LAD[3:0] | Bidirectional address/data bus | Serial 4-bit multiplexed bus carrying START, IDSEL, MADDR, MSIZE, DATA, and RSYNC fields - replaces 28-pin parallel interface. |
| LFRAME# | Frame control input | Indicates start/abort of LPC cycle; driven low by host to initiate firmware read/write - enables precise bus cycle timing control. |
| RST# / INIT# | Dual reset inputs | Active-low asynchronous reset; either pin resets device - ensures robust initialization during power-up or recovery sequences. |
| ID[3:0] | Device identification inputs | Strapped to select one of up to 16 devices on shared LPC bus; boot device must be ID[3:0] = 0000 - enables scalable firmware memory expansion. |
| WP#/AAI | Write protect / AAI enable | Low = hardware write lock for main memory; 9 V = enters AAI mode for multi-byte factory programming - dual-function pin reduces external logic. |
| TBL# | Top block lock | Low = hardware write lock for 16 KB boot block (0x000000–0x003FFF); prevents accidental corruption of critical boot code - independent of WP# state. |
| RY/BY# / LD# | Ready/Busy & Load Enable | Open-drain RY/BY# indicates AAI buffer readiness or program completion; LD# toggles RY/BY# flag state - enables precise host synchronization without polling. |
Key Features
| Feature | Design Value |
|---|---|
| SuperFlash Technology | Split-gate cell with thick-oxide tunneling injector - delivers fixed 18 ms erase time across full lifetime, eliminating software calibration for aging compensation. |
| LPC Burst Read | 128-byte firmware memory reads at 15.6 MB/s - reduces boot latency in legacy PC platforms where LPC is primary firmware interface. |
| Hardware Block Protection | WP#/AAI and TBL# pins provide physical write-disable for main memory and boot block - prevents corruption during power glitches or firmware update failures. |
| AAI Programming Mode | 9 V on WP#/AAI enables rapid multi-byte programming without reissuing addresses - cuts chip rewrite time to 4 seconds typical for factory line efficiency. |
| Security ID Space | 64-bit factory-unique ID + 192-bit OTP - allows OEMs to embed cryptographic keys or device-specific credentials directly into firmware storage. |
Applications
| BIOS/UEFI Firmware Storage | Industrial Control System Boot Code |
|---|---|
|
Use Scenario: Storing BIOS/UEFI images in legacy x86 motherboards and server management controllers (BMCs) with LPC-capable chipsets. IC Role / Device Role / Timing Role: Primary non-volatile firmware memory interfacing directly with Intel ICH or AMD SB LPC host controller - handles burst-read firmware fetch during POST. Use Value: 15.6 MB/s read speed at 33 MHz meets BIOS latency targets; hardware write protection prevents field corruption during remote updates. |
Use Scenario: Holding boot firmware and configuration data in programmable logic controllers (PLCs), HMIs, and CNC motion controllers requiring long-term reliability. IC Role / Device Role / Timing Role: Standalone firmware memory mapped to CPU address space via LPC-to-PCI bridge - executes cold-start initialization before OS load. Use Value: 100,000 erase/write cycles and >100-year data retention ensure operation over 15+ year product lifecycles without refresh. |
| Embedded Platform Recovery Image | Secure Boot Key Storage |
|
Use Scenario: Hosting fallback firmware images in network appliances (firewalls, routers) and telecom baseband units where field recovery is mission-critical. IC Role / Device Role / Timing Role: Secondary firmware partition accessed only during recovery mode - isolated via hardware TBL# lock to prevent overwrite during normal operation. Use Value: Independent TBL# and WP#/AAI pins allow boot block to remain locked while main memory is updated - eliminates risk of bricking. |
Use Scenario: Storing cryptographic keys, certificates, and secure boot manifests in medical devices and payment terminals requiring FIPS-aligned data integrity. IC Role / Device Role / Timing Role: Secure non-volatile storage element accessed via LPC register reads - leverages 192-bit OTP space for one-time key injection during manufacturing. Use Value: Factory-programmed 64-bit unique ID binds firmware to hardware; OTP area prevents key extraction or replay attacks post-deployment. |
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 ID[3:0] and GPI[4:0]. | Requires SPI-to-LPC bridge or chipset redesign; no native LPC support - unsuitable for drop-in replacement in existing LPC-based boards. | Select only if migrating to SPI-based architecture and redesigning host interface logic. |
| Macronix MX25L1606EM2I-12G | Standard SPI interface; 3.3 V; no LPC timing compliance; no INIT#/LFRAME#/LAD[3:0] signal set; no AAI mode or 9 V programming. | Cannot connect directly to LPC host; requires protocol translation or SoC firmware modification - invalid for legacy LPC firmware slots. | Use only in new designs with SPI-native host controllers; not viable for SST49LF016C-33-4C-WHE-T replacement. |
Compared with Winbond W25Q16DVSSIG and Macronix MX25L1606EM2I-12G, the SST49LF016C-33-4C-WHE-T remains uniquely qualified for legacy x86 platforms requiring native LPC v1.1 compliance, hardware boot-block protection, and AAI factory programming - neither alternative replicates its 5-signal interface or dual-reset architecture.
Availability
SST49LF016C-33-4C-WHE-T is available at Aetrix Electronics and suitable for BIOS firmware storage, industrial control boot code, embedded recovery image hosting, and secure key storage requiring stable component supply across extended product lifecycles.
Supply support for SST49LF016C-33-4C-WHE-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 components, and memory solutions, with emphasis on reliability, longevity, and industrial-grade qualification.
The SST49LF016C product line was developed specifically for LPC-based system firmware applications in legacy x86 platforms, delivering high-reliability, low-pin-count flash memory with hardware security and factory programming acceleration.
FAQ
What is the operating voltage range for SST49LF016C-33-4C-WHE-T?
The SST49LF016C-33-4C-WHE-T operates from a single 3.0 V to 3.6 V supply. This voltage range supports direct connection to standard 3.3 V system rails without level-shifting. Operation outside this range - including use of 5 V or 2.5 V supplies - is not supported and may cause functional failure or permanent damage to the SST49LF016C-33-4C-WHE-T.
Does SST49LF016C-33-4C-WHE-T support LPC v1.1 burst reads of 128 bytes?
Yes, the SST49LF016C-33-4C-WHE-T fully supports 128-byte firmware memory read cycles per LPC Interface Specification v1.1, achieving 15.6 MB/s throughput at 33 MHz. This capability is confirmed in Table 2 and Figure 6 of the official datasheet DS20005029B, and is enabled by the MSIZE = 0111 field in the LPC bus protocol - a feature implemented in the SST49LF016C-33-4C-WHE-T silicon.
How does hardware write protection work on SST49LF016C-33-4C-WHE-T?
The SST49LF016C-33-4C-WHE-T implements two independent hardware write protection mechanisms: WP#/AAI pin locks all sectors except the top boot block when pulled low, and TBL# pin locks only the 16 KB boot block (0x000000–0x003FFF) when low. Both override software locking registers - ensuring protection persists even if firmware is compromised. These functions are active in both LPC and AAI modes.
Can SST49LF016C-33-4C-WHE-T be used in new designs despite its EOL status?
Yes - the SST49LF016C-33-4C-WHE-T remains available through Aetrix Electronics with committed supply support, including BOM continuity management and lifecycle coordination. While Microchip has declared it obsolete, Aetrix maintains strategic inventory and traceable sourcing to serve industrial and embedded customers requiring long-term availability for maintenance and replacement in deployed systems.
What package type is used by SST49LF016C-33-4C-WHE-T?
The SST49LF016C-33-4C-WHE-T is packaged in a 32-lead TSOP (8 mm × 14 mm) with gull-wing leads, RoHS-compliant, and rated for commercial temperature range (0°C to +70°C). This matches the "WHE-T" suffix designation per Microchip's ordering information and is distinct from the 32-lead PLCC or 40-lead TSOP variants of the same family.
SST49LF016C-33-4C-WHE-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- SST49
- Package/Case:
- 32-TFSOP (0.488", 12.40mm 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:
- 32-TSOP
SST49LF016C-33-4C-WHE-T FAQ
1.How can I place an order for SST49LF016C-33-4C-WHE-T through Aetrix?
Please submit a Request for Quotation (RFQ) for SST49LF016C-33-4C-WHE-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-WHE-T reliable?
The price and inventory of SST49LF016C-33-4C-WHE-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-WHE-T is usually 5 days.
3.What payment methods are accepted for SST49LF016C-33-4C-WHE-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST49LF016C-33-4C-WHE-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST49LF016C-33-4C-WHE-T?
SST49LF016C-33-4C-WHE-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST49LF016C-33-4C-WHE-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-WHE-T?
For technical support, including SST49LF016C-33-4C-WHE-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-WHE-T requirements.
6.How does Aetrix verify that SST49LF016C-33-4C-WHE-T is sourced from the original manufacturer or authorized distributors?
All SST49LF016C-33-4C-WHE-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-WHE-T meets industry standards.
7.What is the process for return or replacement of SST49LF016C-33-4C-WHE-T?
All SST49LF016C-33-4C-WHE-T units undergo pre-shipment inspection (PSI). If there is an issue with SST49LF016C-33-4C-WHE-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-WHE-T part is unused and in its original packaging.
Return procedure for SST49LF016C-33-4C-WHE-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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