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Microchip Technology SST25LF020A-33-4I-QAE
- Part No.:
- SST25LF020A-33-4I-QAE
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
SST25LF020A-33-4I-QAE.pdf
- Description:
- IC FLASH 2MBIT SPI 33MHZ 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,449
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Product details
Overview
SST25LF020A-33-4I-QAE from Microchip Technology is a 2 Mbit SPI serial flash memory IC operating at 3.0–3.6 V, supporting up to 33 MHz high-speed read, with 4 KByte uniform sectors and 32 KByte overlay blocks, used for firmware storage and boot code in embedded microcontroller systems.
For engineers reviewing the SST25LF020A-33-4I-QAE datasheet, SST25LF020A-33-4I-QAE pinout, SST25LF020A-33-4I-QAE application, or SST25LF020A-33-4I-QAE equivalent, key selection considerations include SPI Mode 0/3 compatibility, industrial temperature range (−40°C to +85°C), SOIC-8 package, write-protection architecture, and Auto Address Increment programming capability.
Technical Context
The SST25LF020A-33-4I-QAE implements a four-wire SPI interface with CE#, SCK, SI, and SO signals, supporting both Mode 0 (SCK idle low) and Mode 3 (SCK idle high). It uses SST's proprietary SuperFlash technology with split-gate cells and thick-oxide tunneling injectors for enhanced reliability.
It features dual erase granularity (4 KByte sectors and 32 KByte blocks), software-controlled block protection via BP1/BP0 bits, and hardware-assisted hold (HOLD#) and write protect (WP#) functions that operate independently of CE# state during active communication.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (262,144 bytes), organized as 64 × 4 KByte sectors |
| Supply Voltage | 3.0–3.6 V - single-supply operation compatible with 3.3 V logic systems |
| Max Clock Frequency | 33 MHz - enables high-speed read via 0BH command with dummy byte |
| Endurance | 100,000 program/erase cycles - supports frequent firmware updates in field-deployed devices |
| Data Retention | Greater than 100 years - ensures long-term nonvolatile storage integrity |
| Operating Temp | −40°C to +85°C - qualified for industrial-grade embedded applications |
| Active Read Current | 7 mA typical - low power consumption during boot code fetch |
| Standby Current | 8 µA typical - minimal quiescent draw in sleep modes |
Pinout & Package
Package: 8-lead SOIC, 150 mil body width (SA suffix), RoHS-compliant, lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CE# | Chip Enable | Active-low device select; must remain low throughout instruction execution |
| SCK | Serial Clock | Timing reference for SPI; rising edge latches input, falling edge outputs data |
| SI | Serial Data Input | Command, address, and data input path; MSB-first, synchronous to SCK rising edge |
| SO | Serial Data Output | Data output path; driven on SCK falling edge; high-impedance during HOLD# active |
| WP# | Write Protect | Hardware enable for status register lock-down (BPL bit); low = BPL functional |
| HOLD# | Hold Control | Suspends ongoing SPI transfer without deselecting device or resetting internal state |
| VDD | Power Supply | 3.0–3.6 V supply input; decoupling capacitor required per layout guidelines |
| VSS | Ground | Reference ground for all I/O and core circuitry; low-inductance connection critical |
Key Features
| Feature | Design Value |
|---|---|
| Auto Address Increment (AAI) | Reduces total programming time for sequential writes by eliminating repeated address transmission |
| Flexible Erase Architecture | Independent 4 KByte sector and 32 KByte block erase enables granular firmware update without full chip erase |
| Software Block Protection | BP1/BP0 bits configure protection for 0%, 25%, 50%, or 100% of memory array; BPL bit prevents accidental modification |
| HOLD# Functionality | Pauses SPI communication mid-sequence while preserving internal address pointer and state - no reinitialization needed |
| High-Speed Read Mode | 33 MHz operation with dummy byte improves boot latency vs. standard 20 MHz read (03H) |
Applications
| Firmware Storage | Boot Code Execution |
|---|---|
Use Scenario: Storing MCU firmware images in space-constrained IoT edge nodes requiring field-upgradable code. IC Role / Device Role / Timing Role: Nonvolatile storage medium accessed via SPI during system power-on reset and bootloader initialization. Use Value: 2 Mbit capacity supports multi-version firmware; 33 MHz high-speed read reduces boot time by ~65% vs. 20 MHz mode. | Use Scenario: Hosting XIP-capable boot code for ARM Cortex-M or RISC-V microcontrollers in industrial HMIs. IC Role / Device Role / Timing Role: Primary boot memory mapped via SPI controller; executes directly or copies to RAM before execution. Use Value: Sector-erase flexibility allows safe over-the-air (OTA) updates without corrupting active boot partition. |
| Configuration Data Logging | Secure Parameter Storage |
Use Scenario: Recording calibration coefficients, sensor offsets, and runtime configuration in medical diagnostic equipment. IC Role / Device Role / Timing Role: Persistent parameter store written infrequently but read at every power cycle; accessed via SPI after system initialization. Use Value: 100,000-cycle endurance and >100-year retention ensure data integrity across product lifetime. | Use Scenario: Storing cryptographic keys, device IDs, and security policies in payment terminals and access control systems. IC Role / Device Role / Timing Role: Tamper-resistant nonvolatile storage with hardware WP# and software BP bits enabling layered write protection. Use Value: BPL bit lock-down prevents unauthorized status register modification even if WP# is asserted. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SPI serial flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST25VF020B | Successor part; same density, 3.0–3.6 V, 50 MHz max clock, improved endurance (100K cycles), extended temp option available | Drop-in replacement for new designs; supports faster read and higher reliability; not pin-/code-compatible with SST25LF020A-33-4I-QAE due to timing and command set differences | Select SST25VF020B for new designs requiring higher performance and longer lifecycle support. |
| AT25DF021 | 2 Mbit SPI flash; 2.7–3.6 V; 70 MHz max clock; different status register map, no AAI mode; supports deep power-down mode | Higher speed and lower voltage range; lacks HOLD# and AAI features; requires modified driver for status polling and protection setup | Choose AT25DF021 when system demands deeper sleep current or wider supply tolerance, accepting driver adaptation. |
Compared with SST25LF020A-33-4I-QAE, SST25VF020B offers higher clock speed and updated reliability specs but requires firmware validation due to subtle command timing changes, while AT25DF021 trades HOLD#/AAI functionality for broader voltage operation and deeper power savings - neither is pin- or code-compatible without design revision.
Availability
SST25LF020A-33-4I-QAE is available at Aetrix Electronics and suitable for industrial control panels, medical instrumentation, and legacy automotive telematics modules requiring stable component supply and long-term obsolescence management.
Supply support for SST25LF020A-33-4I-QAE 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 Silicon Storage Technology (SST) in 2010.
The SST25LF020A-33-4I-QAE belongs to the SST25LF serial flash product line, designed specifically for cost-sensitive, space-constrained embedded systems needing reliable, low-pin-count nonvolatile storage with industrial temperature support.
FAQ
What is the maximum operating frequency of the SST25LF020A-33-4I-QAE?
The SST25LF020A-33-4I-QAE supports up to 33 MHz for High-Speed-Read operations using the 0BH command with a dummy byte. Standard Read (03H) is rated to 20 MHz. The "33" in the part number explicitly denotes this 33 MHz capability, validated across the full industrial temperature range (−40°C to +85°C).
Does the SST25LF020A-33-4I-QAE support SPI Mode 0 and Mode 3?
Yes, the SST25LF020A-33-4I-QAE is fully compatible with both SPI Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1). This dual-mode support allows seamless integration with diverse host controllers without requiring hardware redesign or level-shifting circuits.
What package type does the SST25LF020A-33-4I-QAE use?
The SST25LF020A-33-4I-QAE uses an 8-lead SOIC package with 150 mil body width (SA suffix), compliant with JEDEC MS-012. It is not offered in WSON for this specific variant - the QAE suffix confirms the SOIC-8 industrial-grade configuration.
Is the SST25LF020A-33-4I-QAE recommended for new designs?
No, the SST25LF020A-33-4I-QAE is marked "Not Recommended for New Designs" per Microchip's official documentation (DS25080A, Rev 11/11). Microchip recommends migrating to the SST25VF020B for new projects due to enhanced performance, extended support, and improved manufacturing yield.
How does the HOLD# pin function on the SST25LF020A-33-4I-QAE?
The HOLD# pin on the SST25LF020A-33-4I-QAE suspends ongoing SPI communication without deselecting the device or resetting internal state. When asserted low (with CE# active), it places SO in high-impedance while preserving the address pointer and command context - enabling priority interrupt handling in real-time systems.
SST25LF020A-33-4I-QAE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- SST25
- Package/Case:
- 8-WDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 2Mbit
- Memory Organization:
- 256K x 8
- Memory Interface:
- SPI
- Clock Frequency:
- 33 MHz
- Write Cycle Time - Word, Page:
- 20µs
- Access Time:
- -
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-WSON
SST25LF020A-33-4I-QAE FAQ
1.How can I place an order for SST25LF020A-33-4I-QAE through Aetrix?
Please submit a Request for Quotation (RFQ) for SST25LF020A-33-4I-QAE 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 SST25LF020A-33-4I-QAE reliable?
The price and inventory of SST25LF020A-33-4I-QAE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SST25LF020A-33-4I-QAE is usually 5 days.
3.What payment methods are accepted for SST25LF020A-33-4I-QAE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST25LF020A-33-4I-QAE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST25LF020A-33-4I-QAE?
SST25LF020A-33-4I-QAE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST25LF020A-33-4I-QAE 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 SST25LF020A-33-4I-QAE?
For technical support, including SST25LF020A-33-4I-QAE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST25LF020A-33-4I-QAE requirements.
6.How does Aetrix verify that SST25LF020A-33-4I-QAE is sourced from the original manufacturer or authorized distributors?
All SST25LF020A-33-4I-QAE 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 SST25LF020A-33-4I-QAE meets industry standards.
7.What is the process for return or replacement of SST25LF020A-33-4I-QAE?
All SST25LF020A-33-4I-QAE units undergo pre-shipment inspection (PSI). If there is an issue with SST25LF020A-33-4I-QAE, 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 SST25LF020A-33-4I-QAE part is unused and in its original packaging.
Return procedure for SST25LF020A-33-4I-QAE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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