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Microchip Technology SST39SF020A-55-4I-WHE
- Part No.:
- SST39SF020A-55-4I-WHE
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
SST39SF020A-55-4I-WHE.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,175
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Product details
Overview
SST39SF020A-55-4I-WHE from Microchip Technology is a 2 Mbit (256K × 8) parallel-interface Multi-Purpose Flash memory IC, designed for embedded program/data storage in microcontroller-based systems. It operates at 4.5–5.5 V, delivers 55 ns read access time, supports sector-erase (4 KB uniform sectors), and features hardware/software data protection. It is commonly used in industrial control firmware updates and legacy BIOS storage.
For engineers reviewing the SST39SF020A-55-4I-WHE datasheet, SST39SF020A-55-4I-WHE pinout, SST39SF020A-55-4I-WHE application, or SST39SF020A-55-4I-WHE equivalent, this page provides verified specifications, JEDEC-compliant x8 interface details, SuperFlash reliability metrics (100,000 write cycles, >100-year retention), and real-world use context for legacy system design and obsolescence mitigation.
Technical Context
The SST39SF020A-55-4I-WHE implements SST's proprietary SuperFlash technology with split-gate cell architecture and thick-oxide tunneling injector, enabling fixed erase/program timing independent of cycle count. It uses standard JEDEC x8 flash command sets (e.g., 6-byte sector-erase sequence, 3-byte byte-program unlock) and supports both WE#- and CE#-controlled operations.
It features dual end-of-write detection via Data# Polling (DQ7) and Toggle Bit (DQ6), latched address/data bus, automatic internal VPP generation, and TTL-compatible I/O. The device requires no external high-voltage programming supply and maintains full functionality across its industrial temperature range (–40°C to +85°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (256K × 8) - supports up to 256 KB of firmware or configuration data in byte-wide parallel architecture. |
| Read Access Time | 55 ns - enables direct connection to 14 MHz microcontrollers without wait states in most legacy designs. |
| Write Voltage | Single 4.5–5.5 V supply - eliminates need for dedicated VPP pump circuitry; simplifies power design. |
| Endurance | 100,000 program/erase cycles - validated per JEDEC A117; suitable for field-upgradable firmware with moderate update frequency. |
| Data Retention | Greater than 100 years - specified per JEDEC A103; ensures long-term reliability in unattended industrial deployments. |
| Sector Size | Uniform 4 KByte sectors - allows granular firmware partitioning (e.g., bootloader, application, parameter storage) without full-chip erasure. |
| Operating Temp | –40°C to +85°C (Industrial grade) - qualified for use in factory automation, telecom line cards, and outdoor embedded equipment. |
Pinout & Package
Package: 32-lead PLCC (Plastic Leaded Chip Carrier), RoHS compliant, 1.27 mm pitch, body size 11.43 mm × 13.97 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address Inputs | 17-bit address bus (A0–A16) selects one of 131,072 bytes; A16 is MSB for 256K × 8 addressing. |
| DQ0–DQ7 | Data Input/Output | 8-bit bidirectional data bus; tri-stated when CE# or OE# is high; latches input during write, outputs valid data during read. |
| CE# | Chip Enable | Active-low chip select; device enters standby (30 µA) when high; required low for all operations except write inhibit. |
| OE# | Output Enable | Active-low output gate; controls data bus drive; high-Z state prevents bus contention during reads from other peripherals. |
| WE# | Write Enable | Active-low control for byte-program and erase; initiates internal timing sequences; latches command/address/data on edges per JEDEC flow. |
| VDD | Power Supply | +4.5 V to +5.5 V supply; powers core logic and memory array; internal charge pump generates programming voltage. |
| VSS | Ground | Reference ground for all signals and internal circuitry; must be low-impedance for reliable toggle-bit polling. |
| NC | No Connection | Pins 12 and 27 are unconnected; must remain floating or tied to ground per PCB layout best practices. |
Key Features
| Feature | Design Value |
|---|---|
| SuperFlash® Technology | Split-gate cell with thick-oxide tunneling injector enables fixed 14 µs byte-program and 18 ms sector-erase times-no degradation over lifetime. |
| JEDEC x8 Standard Compliance | Fully compatible with industry-standard flash command sets and pinouts-enables drop-in replacement in existing 8-bit microcontroller sockets. |
| Hardware + Software Data Protection | Includes noise/glitch immunity (<5 ns pulse rejection), VDD power-up/down detection, and mandatory 3-byte unlock sequence for programming. |
| End-of-Write Detection | Dual status reporting via DQ7 (Data# Polling) and DQ6 (Toggle Bit)-allows host CPU to perform background tasks during erase/program. |
| Latched Address & Data | Internal latching eliminates need for external address/data latches in simple 8051 or Z80-based systems-reduces BOM count. |
Applications
| Industrial PLC Firmware Storage | Legacy Telecom Line Card Boot Code |
|---|---|
|
Use Scenario: Storing firmware images and configuration parameters in programmable logic controllers deployed in factory environments with wide temperature swings and EMI exposure. IC Role / Device Role / Timing Role: Nonvolatile program memory mapped into microcontroller address space; accessed via parallel bus during boot and runtime updates. Use Value: 100,000-cycle endurance and >100-year retention ensure firmware integrity over 15+ year product lifecycles without recalibration or refresh. |
Use Scenario: Holding boot loader and DSP initialization code in TDM-based telecom line cards where field upgrades must preserve service continuity. IC Role / Device Role / Timing Role: Primary boot memory for 8-bit/16-bit MCUs; read during power-on reset; programmed via JTAG or serial interface during maintenance windows. Use Value: 4 KB uniform sectors allow safe in-field updates of bootloader only-minimizing risk of bricking the card during partial reflash. |
| Medical Device Configuration Memory | Automotive Body Control Module Calibration Data |
|
Use Scenario: Storing device-specific calibration tables and safety-critical operational limits in Class II medical instruments requiring traceable, tamper-resistant storage. IC Role / Device Role / Timing Role: Secure configuration store accessed by ARM Cortex-M3 MCU; write-protected via hardware (VDD monitoring) and software (3-byte unlock). Use Value: Dual protection schemes prevent accidental overwrite during power transients-meeting IEC 62304 software lifecycle requirements. |
Use Scenario: Retaining vehicle-specific lighting profiles, window position maps, and seat memory settings in BCMs operating under automotive temperature and vibration stress. IC Role / Device Role / Timing Role: EEPROM-replacement data storage interfaced to 8-bit automotive MCU; erased/rewritten during dealer programming sessions. Use Value: Single 5 V supply and industrial-grade temp rating eliminate need for external level shifters or thermal derating-reducing system cost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV020B-55REI | 2 Mbit (256K × 8), 55 ns access, 3.0 V core (3.0–3.6 V), but requires 12 V for programming; different command set (AMD-style). | Requires external VPP generator and level-shifting for 5 V systems; not pin-compatible due to differing pin 1 function (RESET# vs NC). | Select only if migrating to 3 V system architecture and redesigning power delivery; not suitable for drop-in 5 V replacement. |
| MX29LV200CBTI-55G | 2 Mbit (256K × 8), 55 ns, 3.0 V operation (2.7–3.6 V), single-power supply, JEDEC-compatible command set. | Lower VDD range incompatible with 5 V legacy buses; requires level translation or MCU I/O voltage adaptation. | Prefer for new 3 V designs where power efficiency is critical; avoid in existing 5 V systems without signal conditioning. |
Compared with AM29LV020B-55REI and MX29LV200CBTI-55G, the SST39SF020A-55-4I-WHE uniquely supports true 5 V-only operation with internal VPP generation and identical JEDEC pinout-making it the only viable direct replacement for aging 5 V microcontroller platforms requiring zero PCB changes.
Availability
SST39SF020A-55-4I-WHE is available at Aetrix Electronics and suitable for industrial control firmware storage, legacy telecom boot code retention, and medical device configuration memory requiring stable component supply across extended production lifecycles.
Supply support for SST39SF020A-55-4I-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 a focus on embedded control and reliability-critical applications.
The SST39SF020A-55-4I-WHE belongs to Microchip's legacy SuperFlash family, engineered specifically for cost-sensitive, long-lifecycle industrial and telecom systems requiring robust, single-supply parallel flash memory with JEDEC compatibility.
FAQ
What is the maximum operating frequency supported by SST39SF020A-55-4I-WHE?
The SST39SF020A-55-4I-WHE does not operate at a clock frequency-it is an asynchronous parallel flash memory. Its 55 ns read access time corresponds to a maximum effective interface speed of ~18 MHz when interfaced with a microcontroller using standard bus timing. The device has no internal clock; timing is controlled entirely by CE#, OE#, and WE# signal edges per JEDEC specification.
Does SST39SF020A-55-4I-WHE require an external VPP voltage for programming?
No. The SST39SF020A-55-4I-WHE integrates an internal charge pump that generates the high voltage needed for programming and erasing from the single 4.5–5.5 V VDD supply. This eliminates the need for external VPP circuitry, simplifying board design and reducing component count compared to older flash technologies.
How many sectors does SST39SF020A-55-4I-WHE have, and what is their size?
The SST39SF020A-55-4I-WHE contains 64 uniform 4 KByte sectors, totaling 256 KBytes (2 Mbit). Each sector can be erased independently using the JEDEC-standard six-byte command sequence, enabling selective firmware updates without affecting unrelated code or data partitions.
Is SST39SF020A-55-4I-WHE pin-compatible with SST39SF010A or SST39SF040?
Yes-SST39SF020A-55-4I-WHE shares identical pinout and command set with SST39SF010A (1 Mbit) and SST39SF040 (4 Mbit) in the same package variant (e.g., 32-lead PLCC). However, address range differs: SST39SF020A uses A0–A16, while SST39SF040 requires A17 and SST39SF010A uses only A0–A15. System software must match density.
What is the purpose of the "WHE" suffix in SST39SF020A-55-4I-WHE?
The "WHE" suffix denotes a specific packaging and screening variant: "W" = PLCC package, "H" = industrial temperature range (–40°C to +85°C), and "E" = lead-free (RoHS-compliant) construction. This confirms the part meets environmental compliance and thermal requirements for demanding embedded applications.
SST39SF020A-55-4I-WHE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- SST39 MPF™
- 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:
- 2Mbit
- Memory Organization:
- 256K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 20µs
- Access Time:
- 55 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-TSOP
SST39SF020A-55-4I-WHE FAQ
1.How can I place an order for SST39SF020A-55-4I-WHE through Aetrix?
Please submit a Request for Quotation (RFQ) for SST39SF020A-55-4I-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 SST39SF020A-55-4I-WHE reliable?
The price and inventory of SST39SF020A-55-4I-WHE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SST39SF020A-55-4I-WHE is usually 5 days.
3.What payment methods are accepted for SST39SF020A-55-4I-WHE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST39SF020A-55-4I-WHE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST39SF020A-55-4I-WHE?
SST39SF020A-55-4I-WHE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST39SF020A-55-4I-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 SST39SF020A-55-4I-WHE?
For technical support, including SST39SF020A-55-4I-WHE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST39SF020A-55-4I-WHE requirements.
6.How does Aetrix verify that SST39SF020A-55-4I-WHE is sourced from the original manufacturer or authorized distributors?
All SST39SF020A-55-4I-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 SST39SF020A-55-4I-WHE meets industry standards.
7.What is the process for return or replacement of SST39SF020A-55-4I-WHE?
All SST39SF020A-55-4I-WHE units undergo pre-shipment inspection (PSI). If there is an issue with SST39SF020A-55-4I-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 SST39SF020A-55-4I-WHE part is unused and in its original packaging.
Return procedure for SST39SF020A-55-4I-WHE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SST39SF020A-55-4I-WHE Tags
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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