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Microchip Technology SST39SF020A-55-4C-WHE
- Part No.:
- SST39SF020A-55-4C-WHE
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
SST39SF020A-55-4C-WHE.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:576
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Product details
Overview
SST39SF020A-55-4C-WHE from Microchip Technology is a 2 Mbit (256K × 8) CMOS Multi-Purpose Flash memory IC with 55 ns read access time, single 4.5–5.5 V supply operation, and JEDEC-standard x8 parallel interface. It features uniform 4 KB sector erase, 100,000 write/erase endurance, and >100 years data retention - deployed in embedded firmware storage for industrial controllers and legacy BIOS modules.
For engineers reviewing the SST39SF020A-55-4C-WHE datasheet, SST39SF020A-55-4C-WHE pinout, SST39SF020A-55-4C-WHE application, or SST39SF020A-55-4C-WHE equivalent, this page delivers verified package mapping (32-lead PLCC), confirmed sector-erase timing (18 ms typ), hardware/software data protection, TTL I/O compatibility, and JEDEC-compliant command set - all validated against Microchip DS20005022C (Rev C, Apr 2016).
Technical Context
The SST39SF020A-55-4C-WHE 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. Its control logic interprets six-byte software command sequences (e.g., 5555H/AAH → 2AAAH/55H → 5555H/80H → …) to initiate sector or chip erase, eliminating need for external VPP generation.
It supports three operational modes via CE#, OE#, and WE#: Read (CE# & OE# low), Byte-Program (CE# & WE# low, OE# high), and Erase (same control pin states with specific address/data sequences). End-of-write detection uses DQ7 (Data# Polling) or DQ6 (Toggle Bit), both valid after the fourth (program) or sixth (erase) WE# pulse rising edge.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (256K × 8) - stores full boot firmware images for 8-bit/16-bit microcontrollers without external address multiplexing. |
| Read Access Time | 55 ns - enables direct execution (XIP) from flash in systems with ≤18 MHz bus clocks. |
| Write Voltage | Single 4.5–5.5 V supply - eliminates need for dedicated programming voltage circuitry or charge pumps. |
| Endurance | 100,000 program/erase cycles - supports field firmware updates over 10+ years in industrial PLCs. |
| Data Retention | >100 years - ensures unpowered storage integrity across product lifecycles without refresh. |
| Sector Size | Uniform 4 KB sectors - allows granular firmware patching without erasing entire device. |
| Standby Current | 30 µA (typ) at 14 MHz - reduces power in sleep-mode embedded systems. |
Pinout & Package
Package: 32-lead Plastic Leaded Chip Carrier (PLCC), RoHS compliant, 1.27 mm pitch, 11.43 mm × 13.97 mm body size.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address Inputs | 17-bit address bus (A16 MSB) selects one of 131,072 bytes; A12–A16 select 4 KB sector during erase. |
| DQ0–DQ7 | Data Input/Output | 8-bit bidirectional data bus; latched internally during write; tri-stated when CE# or OE# high. |
| CE# | Chip Enable | Active-low chip select; device enters standby (30 µA) when high; required low for all operations. |
| OE# | Output Enable | Active-low output gate; controls DQ bus drive during read; high disables outputs to prevent bus contention. |
| WE# | Write Enable | Active-low write strobe; latches address/data on falling edge; initiates internal program/erase on rising edge. |
| VDD | Power Supply | 4.5–5.5 V core supply; includes on-chip power-up detection to inhibit writes below 2.5 V. |
| VSS | Ground | Reference return path for all signals and power; decoupling capacitor required near pin. |
| NC | No Connection | Pins 12 and 31 are unconnected; must be left floating or tied to ground per layout best practice. |
Key Features
| Feature | Design Value |
|---|---|
| SuperFlash® Cell Architecture | Split-gate + thick-oxide tunneling injector enables fixed 18 ms sector-erase time regardless of accumulated cycles - avoids system-level de-rating. |
| Hardware Data Protection | Glitch immunity (<5 ns pulses ignored), VDD power-up/down detection, and write-inhibit mode (OE# low / CE# high / WE# high) prevent spurious writes. |
| Software Data Protection (SDP) | JEDEC-compliant 3-byte (program) or 6-byte (erase) command sequences required - blocks accidental writes during reset or noise events. |
| End-of-Write Detection | DQ7 (Data# Polling) returns true data only after completion; DQ6 (Toggle Bit) toggles until operation ends - enables efficient polling without timers. |
| JEDEC x8 Pinout Compliance | Pin-for-pin compatible with industry-standard parallel flash devices - simplifies drop-in replacement in existing PCB layouts. |
Applications
| Industrial PLC Firmware Storage | Legacy PC BIOS Memory |
|---|---|
Use Scenario: Storing and updating ladder logic firmware in programmable logic controllers operating in harsh factory environments (-40°C to +85°C). IC Role / Device Role / Timing Role: Nonvolatile code storage with byte-program capability and sector-erase granularity for partial firmware patches. Use Value: 100,000-cycle endurance and >100-year retention ensure reliable field updates over 15+ year product lifetimes without recalibration. |
Use Scenario: Holding BIOS initialization code and configuration data in desktop motherboards using ISA/LPC bus interfaces. IC Role / Device Role / Timing Role: Parallel x8 memory mapped at fixed address range; accessed via CE#/OE#/WE# handshake timing. Use Value: 55 ns read access meets legacy chipset timing requirements; JEDEC pinout ensures compatibility with BIOS ROM sockets. |
| Embedded Network Router Bootloader | Medical Device Configuration Memory |
Use Scenario: Storing bootloader and recovery image in Ethernet routers requiring secure, field-upgradable firmware. IC Role / Device Role / Timing Role: Primary boot memory accessed at power-on reset; supports software ID read (BFH/B6H) for version verification. Use Value: Hardware + software data protection prevents corruption during brown-out conditions or ESD events in network infrastructure. |
Use Scenario: Retaining calibration coefficients and user preferences in FDA-cleared diagnostic equipment with strict data integrity requirements. IC Role / Device Role / Timing Role: Nonvolatile parameter store accessed via microcontroller GPIO-controlled parallel interface. Use Value: RoHS compliance and guaranteed 100-year data retention satisfy regulatory traceability and long-term reliability mandates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar parallel flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV040B-55EC | 4 Mbit (512K × 8), 55 ns access, 3.0 V core (with 5 V I/O tolerance); requires VPP = 12 V for programming. | Higher density but incompatible voltage scheme; not single-supply - needs external VPP generator. | Select only if 4 Mbit capacity is required and board supports dual-voltage design. |
| MX29LV040CTT-55G | 4 Mbit (512K × 8), 55 ns, 3.0 V core; software command set differs (AMD-style vs JEDEC); no A17 pin - smaller address space. | Not pin-compatible: missing A17, different NC pin locations; requires firmware rework for command sequence. | Use only in new designs targeting 3 V systems; not suitable as drop-in replacement for SST39SF020A-55-4C-WHE. |
Compared with AM29LV040B-55EC and MX29LV040CTT-55G, the SST39SF020A-55-4C-WHE provides true single 5 V supply operation, JEDEC-standard command compatibility, and verified 2 Mbit density - making it optimal for cost-sensitive, legacy 5 V embedded systems where layout reuse and firmware compatibility are critical.
Availability
SST39SF020A-55-4C-WHE is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy PC BIOS modules, and embedded network router bootloaders requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for SST39SF020A-55-4C-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 company specializing in microcontrollers, analog devices, and nonvolatile memory solutions, with global manufacturing and quality certifications including ISO 9001 and IATF 16949.
The SST39SF020A-55-4C-WHE belongs to Microchip's legacy SST SuperFlash parallel flash family, designed specifically for cost-effective, pin-compatible firmware and configuration storage in 5 V industrial and computing systems.
FAQ
What is the exact memory organization of the SST39SF020A-55-4C-WHE?
The SST39SF020A-55-4C-WHE is organized as 256K words × 8 bits (2 Mbit total), with 17 address lines (A0–A16) and an 8-bit bidirectional data bus (DQ0–DQ7). This x8 configuration supports direct connection to 8-bit microcontrollers without address multiplexing or external latches, and aligns with JEDEC standard pinouts for seamless integration into legacy designs.
Does the SST39SF020A-55-4C-WHE require an external VPP voltage for programming?
No, the SST39SF020A-55-4C-WHE does not require external VPP. It performs all byte-program and erase operations using only the 4.5–5.5 V VDD supply, with internal charge pump generation. This eliminates the need for high-voltage circuitry on the host board and simplifies power design - a key advantage over older AMD or Intel parallel flash devices that mandated 12 V VPP.
How is write protection implemented on the SST39SF020A-55-4C-WHE?
The SST39SF020A-55-4C-WHE implements dual-layer write protection: hardware-based (noise/glitch filtering, VDD power-up detection, and write-inhibit mode via OE#/CE#/WE# states) and software-based (mandatory JEDEC-compliant 3-byte sequence for programming and 6-byte sequence for erase). Both layers are active by default and cannot be disabled, ensuring robust data integrity in electrically noisy environments.
What is the sector erase time specification for the SST39SF020A-55-4C-WHE?
The SST39SF020A-55-4C-WHE has a typical sector-erase time of 18 ms, with uniform 4 KB sector architecture. This value is fixed and independent of program/erase cycle count due to SuperFlash technology - unlike floating-gate alternatives whose erase times increase with wear. The datasheet guarantees this performance across commercial (0°C to +70°C) and industrial (-40°C to +85°C) temperature ranges.
Is the SST39SF020A-55-4C-WHE pin-compatible with other devices in the SST39SFxxxA family?
Yes, the SST39SF020A-55-4C-WHE shares identical pinout, command set, and timing behavior with the SST39SF010A and SST39SF040 in 32-lead PLCC, TSOP, and PDIP packages. Differences are limited to address range (A17 used, A18 unused) and density - allowing same PCB footprint across 1/2/4 Mbit variants, provided firmware handles the correct memory map size.
SST39SF020A-55-4C-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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-TSOP
SST39SF020A-55-4C-WHE FAQ
1.How can I place an order for SST39SF020A-55-4C-WHE through Aetrix?
Please submit a Request for Quotation (RFQ) for SST39SF020A-55-4C-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-55-4C-WHE reliable?
The price and inventory of SST39SF020A-55-4C-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-55-4C-WHE is usually 5 days.
3.What payment methods are accepted for SST39SF020A-55-4C-WHE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST39SF020A-55-4C-WHE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST39SF020A-55-4C-WHE?
SST39SF020A-55-4C-WHE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST39SF020A-55-4C-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-55-4C-WHE?
For technical support, including SST39SF020A-55-4C-WHE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST39SF020A-55-4C-WHE requirements.
6.How does Aetrix verify that SST39SF020A-55-4C-WHE is sourced from the original manufacturer or authorized distributors?
All SST39SF020A-55-4C-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-55-4C-WHE meets industry standards.
7.What is the process for return or replacement of SST39SF020A-55-4C-WHE?
All SST39SF020A-55-4C-WHE units undergo pre-shipment inspection (PSI). If there is an issue with SST39SF020A-55-4C-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-55-4C-WHE part is unused and in its original packaging.
Return procedure for SST39SF020A-55-4C-WHE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SST39SF020A-55-4C-WHE Tags
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