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Microchip Technology SST49LF160C-33-4C-NHE
- Part No.:
- SST49LF160C-33-4C-NHE
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
SST49LF160C-33-4C-NHE.pdf
- Description:
- IC FLASH 16MBIT PAR 33MHZ 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,711
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Product details
Overview
SST49LF160C-33-4C-NHE from Microchip is a 16 Mbit (2M × 8) LPC interface flash memory IC designed for system firmware storage in host controllers supporting Low Pin Count architecture. It operates at 3.0–3.6 V, supports 33 MHz clock frequency, features hardware write protection via WP#/AAI and TBL# pins, and delivers 7 µs typical program time per byte in standard mode - used in BIOS/UEFI firmware storage on embedded motherboards and industrial control modules.
For engineers reviewing the SST49LF160C-33-4C-NHE datasheet, SST49LF160C-33-4C-NHE pinout, SST49LF160C-33-4C-NHE application, or SST49LF160C-33-4C-NHE equivalent, key selection considerations include LPC bus compatibility (5-signal interface), boot-block hardware lock capability, 100,000-cycle endurance, SuperFlash® reliability, and 32-lead PLCC package mechanical fit for legacy socketed firmware designs.
Technical Context
The SST49LF160C-33-4C-NHE implements a dedicated LPC interface with LAD[3:0], LFRAME#, LCLK, RST#, and INIT# signals - enabling single-byte read/write cycles compliant with Intel LPC specification v1.1. Its internal SuperFlash® split-gate cell architecture provides fixed erase/program timing independent of cycle count.
It supports two operational modes: standard LPC mode (VIL/VIH on WP#/AAI) and Auto Address Increment (AAI) mode (9 V on WP#/AAI), where GPI0 and GPI1 repurpose as RY/BY# and LD# for rapid factory programming. Block locking registers and hardware TBL#/WP# pins enforce hierarchical write protection across 35 uniform 4 KByte sectors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 16 Mbit (2,097,152 × 8 bits) - sufficient for full UEFI firmware images in compact embedded systems. |
| Interface Standard | LPC v1.1 compliant - reduces host controller pin count from 32 (parallel flash) to 5 signals, lowering ASIC cost and PCB routing complexity. |
| Supply Voltage | 3.0–3.6 V - compatible with standard 3.3 V system rails without level-shifting circuitry. |
| Max Clock Frequency | 33 MHz - enables high-throughput firmware updates while maintaining timing margin for legacy LPC bridges. |
| Endurance | 100,000 program/erase cycles (typical) - supports field firmware upgrades over product lifetime without wear-out risk. |
| Data Retention | >100 years - ensures BIOS integrity across decades of unpowered storage in industrial deployments. |
| Program Time | 7 µs/byte (typical, single-byte) - enables fast in-system reprogramming during manufacturing or service. |
| Package | 32-lead PLCC (lead-free, RoHS-compliant) - matches socketed footprint of legacy motherboard designs requiring drop-in replacement. |
Pinout & Package
32-lead Plastic Leaded Chip Carrier (PLCC), lead-free, RoHS-compliant. Pin 1 index corner marked with notch; top view orientation per Figure 3 in DS20005099B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LAD[3:0] | LPC Address/Data Bus | 4-bit bidirectional serial bus carrying address nibbles, command fields, and data - replaces 8-bit parallel bus with reduced signal count. |
| LCLK | LPC Clock Input | Accepts 33 MHz host-controlled clock; synchronizes all LPC bus transactions including read/write and command sequences. |
| LFRAME# | LPC Frame Control | Active-low signal indicating start or abort of LPC cycle; used to initiate memory access or terminate incomplete transfers. |
| RST# / INIT# | Reset Inputs | Dual reset inputs (internally OR'd); low pulse resets device state and places LAD[3:0] in high-Z - required for CPU initialization sequence. |
| ID[3:0] | Device Identification | Hardware-strapped 4-bit ID enabling up to 16 devices on same LPC bus; boot device must be ID=0000. |
| GPI[4:0] | General Purpose Inputs | Five digital inputs readable via LPC registers; GPI0/GPI1 repurpose as RY/BY# and LD# in AAI mode for factory programming. |
| WP#/AAI | Write Protect / AAI Enable | Low = hardware write protect for non-boot blocks; 9 V = enter AAI mode for multi-byte programming; VIH/VIL = return to LPC mode. |
| TBL# | Top Block Lock | Low = hardware lock for 16 KByte boot block; overrides software lock register - prevents accidental corruption of critical startup code. |
| RY/BY# | Ready/Busy Output | Open-drain flag indicating internal operation completion (LPC mode) or buffer readiness (AAI mode); used with LD# for state detection. |
| LD# | Load Enable Input | In AAI mode, low = host loading data; high = command termination; toggles RY/BY# function between buffer-ready and programming-complete states. |
| VDD / VSS | Power / Ground | 3.0–3.6 V supply with decoupling requirements: 0.1 µF ceramic + 4.7 µF electrolytic within 1 cm of VDD pin. |
Key Features
| Feature | Design Value |
|---|---|
| LPC 5-signal interface | Reduces host controller pin count by >84% vs. parallel flash, cutting ASIC cost and simplifying PCB layout in space-constrained designs. |
| Hardware + software write protection | WP#/AAI and TBL# pins provide physical lockout of boot and main blocks, complemented by programmable block-locking registers for granular firmware security. |
| Auto Address Increment (AAI) mode | Enables rapid factory programming at 2.5 µs/byte (quad-byte) using 9 V on WP#/AAI - cuts full-chip rewrite time to ~4 seconds (typical). |
| 256-bit Security ID space | Includes 64-bit factory-unique ID and 192-bit user-programmable OTP - supports secure boot authentication and device identity binding in trusted computing environments. |
| SuperFlash® technology | Split-gate cell design delivers fixed 18 ms sector/block erase time regardless of accumulated cycles - eliminates software calibration for timing drift. |
| Uniform 4 KByte sectors | 35-sector map (1×16 KB boot + 2×8 KB + 1×32 KB + 31×64 KB) enables flexible firmware partitioning for modular BIOS updates and parameter storage. |
Applications
| BIOS/UEFI Firmware Storage | Industrial Control Module Boot Memory |
|---|---|
|
Use Scenario: Storing and executing core system firmware on x86-based embedded motherboards with LPC-compatible chipsets. IC Role / Device Role / Timing Role: Non-volatile firmware storage IC interfacing directly with southbridge LPC bus; provides boot code execution path and runtime configuration storage. Use Value: Hardware TBL# lock prevents corruption of top 16 KB boot block during field updates; 100-year data retention ensures firmware integrity across equipment lifecycle. |
Use Scenario: Holding bootloader and application firmware in DIN-rail mounted PLCs and HMIs where long-term reliability and in-field update capability are critical. IC Role / Device Role / Timing Role: System-level firmware memory with dual reset (RST#/INIT#) support for robust recovery after brown-out or watchdog timeout events. Use Value: 100,000-cycle endurance allows repeated firmware revisions during commissioning and maintenance; 3.0–3.6 V operation matches industrial 3.3 V power domains. |
| Legacy Server Management Controller (BMC) | Medical Device Diagnostic Firmware |
|
Use Scenario: Providing persistent firmware image storage for IPMI-capable Baseboard Management Controllers in rack-mount servers. IC Role / Device Role / Timing Role: LPC-connected flash memory serving as primary boot source for ARM-based BMC SoCs; accessed during cold boot and remote firmware update. Use Value: ID[3:0] multi-device support enables redundant firmware storage across dual SST49LF160C-33-4C-NHE devices; RY/BY# enables precise timing control during remote flash operations. |
Use Scenario: Storing certified diagnostic application code and calibration data in FDA-cleared portable medical instruments requiring traceable firmware versions. IC Role / Device Role / Timing Role: Secure, tamper-resistant firmware storage with 256-bit Security ID - used to bind firmware signature to hardware identity for regulatory audit trails. Use Value: Factory-programmed 64-bit unique ID + 192-bit user OTP enables cryptographic signing of firmware updates; RoHS-compliant PLCC meets medical-grade material requirements. |
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 W39L020PZ | 2 M × 8, 3.3 V, LPC interface, but lacks AAI mode and Security ID; 55 ns access time vs. SST's variable latency architecture. | No hardware boot-block lock (TBL#) or 256-bit security space - unsuitable for secure boot or regulated firmware storage. | Select only for cost-sensitive, non-secure legacy systems where AAI programming speed and firmware integrity are not required. |
| Spansion S29GL01GP11TFI010 | 1 Gbit parallel NOR flash with LPC-to-parallel bridge; requires external logic; no native LPC interface or TBL#/WP# pins. | Higher density but incompatible pinout and protocol - necessitates PCB redesign and driver changes; no SuperFlash® reliability benefits. | Consider only when migrating from SST49LF160C-33-4C-NHE to higher-density storage with full redesign budget and timeline. |
Compared with Winbond W39L020PZ and Spansion S29GL01GP11TFI010, the SST49LF160C-33-4C-NHE uniquely integrates native LPC compliance, hardware boot-block protection, AAI factory programming, and 256-bit security - making it irreplaceable in designs requiring secure, socketed, low-pin-count firmware storage without board-level changes.
Availability
SST49LF160C-33-4C-NHE is available at Aetrix Electronics and suitable for BIOS firmware storage, industrial control module boot memory, and medical device diagnostic firmware requiring stable component supply and long-lifecycle support.
Supply support for SST49LF160C-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 Inc. is a leading provider of microcontrollers, analog components, and memory solutions, with expertise in embedded control and secure connectivity.
The SST49LF160C-33-4C-NHE belongs to Microchip's legacy SuperFlash® LPC flash memory product line, engineered specifically for reliable, low-pin-count firmware storage in x86 and embedded host systems requiring BIOS/UEFI compatibility.
FAQ
What is the operating voltage range for the SST49LF160C-33-4C-NHE?
The SST49LF160C-33-4C-NHE operates within a strict 3.0 V to 3.6 V supply range. Operation outside this window may cause unreliable read/write behavior or failure to enter LPC or AAI mode. The device draws 12 mA typical active current and only 10 µA in standby - making it suitable for low-power embedded systems where rail stability is maintained within this band. Always use recommended decoupling: 0.1 µF ceramic + 4.7 µF electrolytic near VDD.
Does the SST49LF160C-33-4C-NHE support pin-compatible replacements?
No verified pin-compatible replacements exist for the SST49LF160C-33-4C-NHE. While other 32-lead PLCC flash devices share the same package outline, differences in LPC signaling behavior, pin function mapping (e.g., GPI/RY-BY#/LD# repurposing), and hardware protection logic (TBL#/WP# interaction) prevent direct substitution. Any alternative requires validation of command set timing, ID strapping compatibility, and reset synchronization - confirmed only through full functional testing with the exact SST49LF160C-33-4C-NHE datasheet (DS20005099B).
How does the Security ID feature work in the SST49LF160C-33-4C-NHE?
The SST49LF160C-33-4C-NHE includes a 256-bit Security ID space: 64 bits are factory-programmed as a unique device identifier, and 192 bits are one-time programmable (OTP) by the user. This space is accessed via the Read-Security-ID command (0x90) and supports cryptographic binding of firmware images to specific hardware units. Unlike general-purpose memory, the Security ID area cannot be erased or rewritten after programming - ensuring immutable device identity for secure boot and regulatory traceability applications.
What is the purpose of the INIT# pin on the SST49LF160C-33-4C-NHE?
The INIT# pin on the SST49LF160C-33-4C-NHE serves as a secondary reset input, functionally identical to RST# and internally OR'd with it. It is intended for in-system use where separate reset control paths are needed - for example, to isolate firmware reset from power-on reset sequencing. Driving INIT# low (≤0.8 V) for ≥TRSTP duration resets internal state, deselects the device, and places LAD[3:0] in high-impedance mode. Both RST# and INIT# must be held stable during Program/Erase operations to avoid data corruption.
Can the SST49LF160C-33-4C-NHE be used in new designs despite its EOL status?
Yes - the SST49LF160C-33-4C-NHE remains viable for new designs where long-term availability, socketed firmware upgradeability, and LPC interface compatibility are mandatory. Aetrix Electronics maintains strategic inventory and offers lifecycle coordination, including last-time buy planning and cross-reference support. However, designers should confirm final qualification with Microchip's official EOL notice (DS20005099B) and implement BOM continuity management early due to limited future supply windows.
SST49LF160C-33-4C-NHE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- SST49
- Package/Case:
- 32-LCC (J-Lead)
- Packaging:
- Tube
- 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:
- 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)
SST49LF160C-33-4C-NHE FAQ
1.How can I place an order for SST49LF160C-33-4C-NHE through Aetrix?
Please submit a Request for Quotation (RFQ) for SST49LF160C-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 SST49LF160C-33-4C-NHE reliable?
The price and inventory of SST49LF160C-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 SST49LF160C-33-4C-NHE is usually 5 days.
3.What payment methods are accepted for SST49LF160C-33-4C-NHE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST49LF160C-33-4C-NHE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST49LF160C-33-4C-NHE?
SST49LF160C-33-4C-NHE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST49LF160C-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 SST49LF160C-33-4C-NHE?
For technical support, including SST49LF160C-33-4C-NHE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST49LF160C-33-4C-NHE requirements.
6.How does Aetrix verify that SST49LF160C-33-4C-NHE is sourced from the original manufacturer or authorized distributors?
All SST49LF160C-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 SST49LF160C-33-4C-NHE meets industry standards.
7.What is the process for return or replacement of SST49LF160C-33-4C-NHE?
All SST49LF160C-33-4C-NHE units undergo pre-shipment inspection (PSI). If there is an issue with SST49LF160C-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 SST49LF160C-33-4C-NHE part is unused and in its original packaging.
Return procedure for SST49LF160C-33-4C-NHE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SST49LF160C-33-4C-NHE Tags
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