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Microchip Technology SST39SF020A-45-4I-WHE
- Part No.:
- SST39SF020A-45-4I-WHE
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
SST39SF020A-45-4I-WHE.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,008
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Product details
Overview
SST39SF020A-45-4I-WHE from Microchip Technology is a 2 Mbit (256K × 8) CMOS Multi-Purpose Flash memory IC with single 4.5–5.5V supply operation, 55 ns read access time, and JEDEC-standard x8 pinout. It features uniform 4 KB sector erase, 100,000 write/erase endurance, and >100-year data retention-used in embedded firmware storage for industrial controllers and legacy BIOS modules.
For engineers reviewing the SST39SF020A-45-4I-WHE datasheet, SST39SF020A-45-4I-WHE pinout, SST39SF020A-45-4I-WHE application, or SST39SF020A-45-4I-WHE equivalent, key selection criteria include 55 ns read timing, 4.5–5.5V VDD compatibility, PLCC-32 package footprint, sector-erase granularity, and software data protection command sequence compliance.
Technical Context
This device implements SST's proprietary SuperFlash technology with split-gate cell architecture and thick-oxide tunneling injector, enabling fixed erase/program times independent of cycle count. It supports standard microprocessor bus interfacing via CE#, OE#, and WE# control signals with TTL-compatible I/Os and latched address/data paths.
Operation relies on JEDEC-standard command sequences: three-byte load for byte-program, six-byte load for sector/chip-erase, and dedicated software ID entry (0x90) to verify device identity (B6H). End-of-write detection uses Data# Polling (DQ7) or Toggle Bit (DQ6), both valid after the fourth (program) or sixth (erase) WE#/CE# pulse.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (256K × 8) - supports full firmware images up to 256 KB in x8 bus systems |
| Read Access Time | 55 ns - enables direct execution from flash (XIP) in 14 MHz microcontroller systems |
| Supply Voltage | 4.5–5.5 V - compatible with legacy 5 V logic rails without level-shifting |
| Endurance | 100,000 cycles - sufficient for field-upgradable firmware with infrequent updates |
| Data Retention | >100 years - ensures long-term reliability in unpowered storage applications |
| Sector Size | 4 KB uniform sectors - allows granular firmware patching without full chip erase |
| Byte-Program Time | 14 µs typical - minimizes update latency during in-system programming |
Pinout & Package
Package: 32-lead PLCC (Plastic Leaded Chip Carrier), 11.43 mm × 13.97 mm body, 1.78 mm height, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address Inputs | 17-bit address bus supporting 256K locations; A16 is most significant bit for SST39SF020A |
| DQ0–DQ7 | Data I/O | 8-bit bidirectional data bus; tri-stated when CE# or OE# high; latched internally during write |
| CE# | Chip Enable | Active-low chip select; device enters standby (30 µA) when high |
| OE# | Output Enable | Active-low output gate; controls data bus drive without deselecting chip |
| WE# | Write Enable | Active-low write control; initiates program/erase command latching on rising edge |
| VDD | Power Supply | 4.5–5.5 V core supply; includes internal VPP generation for erase/program |
| VSS | Ground | Reference return path for all digital and analog functions |
| NC | No Connection | Pins 17, 20, and 31 are unconnected; must be left floating or tied to ground per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| SuperFlash Technology | Split-gate cell with thick-oxide injector delivers fixed 18 ms sector-erase time regardless of accumulated cycles |
| Software Data Protection | JEDEC-compliant 3-byte (program) or 6-byte (erase) command sequence prevents accidental writes during power transitions |
| Hardware Write Inhibit | Automatic lockout when VDD < 2.5 V or WE#/CE#/OE# glitch < 5 ns eliminates spurious programming |
| End-of-Write Detection | DQ7 (Data# Polling) and DQ6 (Toggle Bit) provide deterministic status without external timers or polling delays |
| JEDEC Pinout Compliance | Standard x8 memory pin assignment enables drop-in replacement for other 32-pin PLCC flash devices |
Applications
| Industrial PLC Firmware Storage | Legacy PC BIOS Memory |
|---|---|
Use Scenario: Storing ladder logic programs and configuration parameters in programmable logic controllers operating in harsh factory environments. IC Role / Device Role / Timing Role: Nonvolatile code storage with direct bus interface; 55 ns read timing supports real-time scan cycle execution. Use Value: 100,000-cycle endurance and >100-year retention ensure firmware integrity over 15+ year equipment lifespans without backup batteries. | Use Scenario: Holding BIOS boot code and hardware initialization routines in desktop motherboards from late 1990s to early 2000s. IC Role / Device Role / Timing Role: Primary boot ROM mapped at 0xFFFF0; accessed via ISA/LPC bus with strict 55 ns timing window. Use Value: Single 5 V supply eliminates need for charge-pump circuitry, reducing BOM cost and board space versus EEPROM alternatives. |
| Telecom Line Card Configuration | Medical Device Calibration Data |
Use Scenario: Storing port mapping tables and protocol stack parameters on carrier-grade DSLAM line cards requiring field updates. IC Role / Device Role / Timing Role: Sector-erasable configuration store; 4 KB granularity enables safe patching without disrupting active services. Use Value: Uniform sector architecture and software data protection prevent corruption during partial reprogramming over maintenance interfaces. | Use Scenario: Retaining sensor calibration coefficients and safety-critical firmware patches in portable diagnostic equipment. IC Role / Device Role / Timing Role: Secure nonvolatile memory with hardware write inhibit during power-up/down to prevent parameter loss. Use Value: VDD power-up detection and noise immunity guarantee zero unintended writes during battery swaps or brownout conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV040B-70JC | 4 Mbit density, 70 ns access, 3.0 V core (with 5 V I/O tolerance), different command set | Requires voltage translation in pure 5 V systems; larger capacity may waste PCB area | Select only if higher density and 3.3 V compatibility are required; not pin-compatible |
| MX29LV040CTC-70G | 4 Mbit, 70 ns, 3.0 V core, supports CFI query mode, different sector map (64 KB + 8×8 KB) | Larger minimum erase block increases risk of data loss during partial updates | Prefer for new designs needing CFI support; requires firmware adaptation and layout change |
Compared with AM29LV040B-70JC and MX29LV040CTC-70G, the SST39SF020A-45-4I-WHE offers exact 5 V operation, 55 ns speed, and 4 KB sector granularity-making it optimal for legacy 5 V systems where minimal firmware changes and proven field reliability are critical.
Availability
SST39SF020A-45-4I-WHE is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy BIOS modules, telecom line card configuration, and medical device calibration data requiring stable component supply across extended product lifecycles.
Supply support for SST39SF020A-45-4I-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 U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and memory solutions, with broad industrial and automotive qualification coverage.
The SST39SF020A-45-4I-WHE belongs to Microchip's legacy SST SuperFlash family, designed specifically for cost-sensitive, 5 V-based embedded systems requiring reliable, sector-erasable nonvolatile storage without complex voltage management.
FAQ
What is the maximum operating temperature range for the SST39SF020A-45-4I-WHE?
The SST39SF020A-45-4I-WHE is rated for industrial temperature operation from –40°C to +85°C, as confirmed in Table 5 of the official datasheet (DS20005022C). This makes the SST39SF020A-45-4I-WHE suitable for deployment in factory automation equipment, outdoor telecom enclosures, and other thermally demanding environments without derating.
Does the SST39SF020A-45-4I-WHE require an external high-voltage supply for programming?
No, the SST39SF020A-45-4I-WHE integrates internal VPP generation and operates with a single 4.5–5.5 V supply for both read and write operations. The SST39SF020A-45-4I-WHE eliminates the need for external charge pumps or 12 V programming voltages, simplifying system power design and reducing component count.
How is device identity verified for the SST39SF020A-45-4I-WHE during system initialization?
The SST39SF020A-45-4I-WHE supports Software Product Identification mode using a three-byte command sequence (0x5555/0xAA, 0x2AAA/0x55, 0x5555/0x90). Reading address 0x0001 returns device ID 0xB6, uniquely identifying the SST39SF020A-45-4I-WHE. This verification is implemented in bootloader code to prevent firmware mismatches.
What is the sector-erase time specification for the SST39SF020A-45-4I-WHE?
The SST39SF020A-45-4I-WHE has a typical sector-erase time of 18 ms, as specified in the Features section and Table 12 of the datasheet. This fixed duration-guaranteed across the full 100,000-cycle endurance life-is enabled by SST's SuperFlash split-gate technology and does not degrade with usage.
Is the SST39SF020A-45-4I-WHE pin-compatible with the SST39SF010A or SST39SF040?
Yes, the SST39SF020A-45-4I-WHE shares identical 32-pin PLCC pinout and command set with SST39SF010A and SST39SF040, differing only in address depth (A16 vs A17 vs A18) and memory size. This allows hardware reuse across 1/2/4 Mbit variants, though firmware must validate device ID (0xB5/0xB6/0xB7) before issuing erase commands.
SST39SF020A-45-4I-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:
- 45 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-45-4I-WHE FAQ
1.How can I place an order for SST39SF020A-45-4I-WHE through Aetrix?
Please submit a Request for Quotation (RFQ) for SST39SF020A-45-4I-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-45-4I-WHE reliable?
The price and inventory of SST39SF020A-45-4I-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-45-4I-WHE is usually 5 days.
3.What payment methods are accepted for SST39SF020A-45-4I-WHE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST39SF020A-45-4I-WHE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST39SF020A-45-4I-WHE?
SST39SF020A-45-4I-WHE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST39SF020A-45-4I-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-45-4I-WHE?
For technical support, including SST39SF020A-45-4I-WHE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST39SF020A-45-4I-WHE requirements.
6.How does Aetrix verify that SST39SF020A-45-4I-WHE is sourced from the original manufacturer or authorized distributors?
All SST39SF020A-45-4I-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-45-4I-WHE meets industry standards.
7.What is the process for return or replacement of SST39SF020A-45-4I-WHE?
All SST39SF020A-45-4I-WHE units undergo pre-shipment inspection (PSI). If there is an issue with SST39SF020A-45-4I-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-45-4I-WHE part is unused and in its original packaging.
Return procedure for SST39SF020A-45-4I-WHE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SST39SF020A-45-4I-WHE Tags
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