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Microchip Technology SST39SF020A-55-4I-WHE-T
- Part No.:
- SST39SF020A-55-4I-WHE-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
SST39SF020A-55-4I-WHE-T.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,900
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Product details
Overview
SST39SF020A-55-4I-WHE-T from Microchip Technology is a 2 Mbit (256K × 8) parallel-interface CMOS Multi-Purpose Flash memory IC, organized as 256K words × 8 bits, operating at 4.5–5.5 V with 55 ns read access time and JEDEC-standard x8 pinout. It delivers byte-program in 14 µs (typ), sector-erase in 18 ms (typ), and chip-erase in 70 ms (typ), and is used for firmware storage and configuration in industrial control panels requiring reliable nonvolatile code retention.
For engineers reviewing the SST39SF020A-55-4I-WHE-T datasheet, SST39SF020A-55-4I-WHE-T pinout, SST39SF020A-55-4I-WHE-T application, or SST39SF020A-55-4I-WHE-T equivalent, this page provides verified package mapping (32-lead TSOP), JEDEC-compliant command set, SuperFlash reliability metrics (100,000 write cycles, >100-year data retention), and real-world timing behavior under 5 V operation.
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-unlike conventional flash where timing degrades over endurance life. It supports standard microprocessor bus interfacing via CE#, OE#, and WE# control lines, with latched address/data and TTL-compatible I/O.
Write operations require a six-byte software data protection (SDP) sequence for sector or chip erase, and a three-byte sequence for byte-program; product identification uses a software ID entry mode returning Manufacturer ID BFH and Device ID B6H. Hardware protection includes VDD power-up/down detection (<2.5 V inhibits writes) and noise/glitch immunity (WE#/CE# pulses <5 ns ignored).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (256K × 8), directly maps to 256 KB of firmware or configuration space in 8-bit microcontroller systems. |
| Read Access Time | 55 ns - enables direct execution from flash (XIP) in legacy 8-bit/16-bit controllers without wait states at ≤18 MHz bus clock. |
| Byte-Program Time | 14 µs (typ) - allows rapid field updates of individual parameters or calibration tables without system interruption. |
| Sector-Erase Time | 18 ms (typ) - erases uniform 4 KByte sectors, supporting modular firmware patching with minimal downtime. |
| Endurance & Retention | 100,000 program/erase cycles, >100 years data retention - validated per JEDEC A117/A103, suitable for unattended industrial deployments. |
| Supply Voltage | 4.5–5.5 V - compatible with legacy 5 V logic rails and eliminates need for external voltage translators. |
| Operating Temperature | –40°C to +85°C (Industrial grade) - qualified for use in motor drives, PLC modules, and outdoor metering hardware. |
Pinout & Package
Package: 32-lead TSOP (8 mm × 14 mm), RoHS-compliant, surface-mountable with standard reflow profile.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address Inputs | 17-bit address bus (A0–A16) selects one of 131,072 bytes; A17 is MSB for 256K addressing (SST39SF020A-specific). |
| DQ0–DQ7 | Data Input/Output | 8-bit bidirectional data bus; tri-stated when CE# or OE# high; supports latched write and true-data read post-program. |
| CE# | Chip Enable | Active-low chip select; device enters standby (30 µA) when high; required low for all read/write/erase operations. |
| OE# | Output Enable | Active-low output gate; controls DQ bus drive during read; high-Z when high, even if CE# is low. |
| WE# | Write Enable | Active-low write strobe; initiates byte-program, sector-erase, or chip-erase upon rising edge after SDP sequence. |
| VDD | Power Supply | 4.5–5.5 V supply; internal charge pump generates VPP for programming; no external high-voltage source needed. |
| VSS | Ground | Reference ground for all signals and internal circuitry; must be low-impedance connection for stable erase/write margins. |
Key Features
| Feature | Design Value |
|---|---|
| SuperFlash® Technology | Split-gate cell with thick-oxide tunneling injector ensures consistent 55 ns read and 14 µs program times across full 100,000-cycle lifetime. |
| Uniform 4 KByte Sectors | Enables granular firmware updates: only modified sectors are erased, preserving adjacent code and reducing update latency. |
| End-of-Write Detection | Toggle Bit (DQ6) and Data# Polling (DQ7) provide deterministic, software-driven status without polling timers or timeouts. |
| JEDEC x8 Pinout Compliance | Direct drop-in replacement for industry-standard 27Cxxx EPROMs and earlier flash devices in existing 32-pin layouts. |
| Hardware + Software Data Protection | VDD monitoring, 5 ns glitch rejection, and mandatory 3-/6-byte SDP sequences prevent accidental writes during power transitions or noise events. |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded System Boot Code |
|---|---|
Use Scenario: Storing ladder logic firmware and I/O configuration tables in DIN-rail mounted programmable logic controllers operating continuously in factory environments. IC Role / Device Role / Timing Role: Nonvolatile boot memory mapped to CPU address space; accessed via 8-bit parallel bus with CE#/OE#/WE# handshaking. Use Value: 100,000-cycle endurance and –40°C to +85°C rating ensure 15+ years of maintenance-free operation without field reprogramming failures. |
Use Scenario: Hosting BIOS/bootloader code in legacy 8051- or Z80-based medical diagnostic instruments where firmware rarely changes but must survive power loss. IC Role / Device Role / Timing Role: Primary code storage executing in place (XIP); 55 ns access meets timing budget for 18 MHz system clocks without wait states. Use Value: >100-year data retention guarantees firmware integrity across instrument lifetime, eliminating recalibration due to bit rot. |
| Point-of-Sale Terminal Configuration | Telecom Line Card Parameter Storage |
Use Scenario: Holding localized tax tables, language packs, and peripheral driver settings in retail POS terminals deployed globally with regional variants. IC Role / Device Role / Timing Role: Field-updatable configuration memory; sector-erase isolates region-specific data from core application code. Use Value: 18 ms sector-erase enables sub-second over-the-air parameter updates without rebooting the terminal or interrupting transactions. |
Use Scenario: Storing line impedance profiles, gain calibration coefficients, and protocol stack parameters on carrier-grade DSLAM line cards. IC Role / Device Role / Timing Role: Calibration data repository accessed during card initialization; byte-program allows single-parameter correction without full reflash. Use Value: 14 µs byte-program time permits real-time coefficient adjustment during service calls, reducing technician dwell time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT29LV020-15JI | 2 Mbit, 150 ns access, 3.0 V core (with 5 V I/O tolerance), 100,000 cycles, same 32-pin TSOP package. | Requires level-shifting for pure 5 V systems; slower read limits XIP performance in high-speed controllers. | Select when migrating to lower-power 3.3 V domains or when 150 ns timing suffices for cost-sensitive designs. |
| MX29LV200CBTI-70G | 2 Mbit, 70 ns access, 3.0 V core, 100,000 cycles, 48-pin TSOP; supports CFI query and wider command set. | Not pin-compatible; requires PCB redesign; CFI support simplifies auto-detection in multi-vendor BOMs. | Choose for new designs needing standardized flash interrogation or future-proofing with extended feature set. |
Compared with AT29LV020-15JI and MX29LV200CBTI-70G, the SST39SF020A-55-4I-WHE-T uniquely delivers 55 ns read speed at 5 V while maintaining JEDEC x8 pinout compatibility-enabling drop-in upgrades in legacy 5 V systems without layout or timing margin compromises.
Availability
SST39SF020A-55-4I-WHE-T is available at Aetrix Electronics and suitable for industrial control panels, legacy embedded boot systems, point-of-sale terminals, and telecom line cards requiring stable component supply with guaranteed long-term availability.
Supply support for SST39SF020A-55-4I-WHE-T 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 broad industrial and automotive qualification coverage.
The SST39SF020A belongs to Microchip's legacy SuperFlash parallel flash product line, designed specifically for cost-sensitive, high-reliability firmware and configuration storage in 5 V embedded systems where pin compatibility and timing predictability are critical.
FAQ
What is the exact memory organization of the SST39SF020A-55-4I-WHE-T?
The SST39SF020A-55-4I-WHE-T is organized as 256K × 8, providing 2,097,152 bits (2 Mbit) of storage across 262,144 addressable bytes. Its 17 address lines (A0–A16) plus A17 as MSB enable full 256K-word addressing. This matches JEDEC-standard x8 parallel flash topology and supports direct replacement of 27C256 EPROMs in existing designs.
Does the SST39SF020A-55-4I-WHE-T require an external VPP voltage for programming?
No, the SST39SF020A-55-4I-WHE-T does not require an external VPP voltage. It integrates an internal charge pump that generates the necessary high voltage for programming and erasing from the standard 4.5–5.5 V VDD supply. This eliminates external high-voltage circuitry and simplifies system design compared to older EPROM or early flash devices.
How is the SST39SF020A-55-4I-WHE-T identified during software product ID read?
When entering Software Product ID mode using the three-byte command sequence (5555H/AAH → 2AAAH/55H → 5555H/90H), the SST39SF020A-55-4I-WHE-T returns Manufacturer ID BFH at address 0000H and Device ID B6H at address 0001H. This unambiguous ID enables runtime validation in multi-vendor socket designs and prevents firmware mismatches.
What are the valid methods to detect completion of a byte-program operation on the SST39SF020A-55-4I-WHE-T?
The SST39SF020A-55-4I-WHE-T supports two hardware-confirmed end-of-write detection methods: Data# Polling (monitoring DQ7 for transition from complement to true data) and Toggle Bit (observing toggling on DQ6 until it stabilizes). Both are valid after the rising edge of the fourth WE# or CE# pulse and eliminate need for fixed delay loops in host firmware.
Is the SST39SF020A-55-4I-WHE-T pin-compatible with the SST39SF010A or SST39SF040?
Yes, the SST39SF020A-55-4I-WHE-T shares identical pinout and command set with SST39SF010A and SST39SF040 across all supported packages (TSOP, PLCC, PDIP). Differences lie only in address depth (A17 active for SST39SF020A vs A16 for SST39SF010A vs A18 for SST39SF040) and timing-critical parameters like chip-erase duration-enabling scalable memory upgrades within same PCB footprint.
SST39SF020A-55-4I-WHE-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- SST39 MPF™
- Package/Case:
- 32-TFSOP (0.488", 12.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-T FAQ
1.How can I place an order for SST39SF020A-55-4I-WHE-T through Aetrix?
Please submit a Request for Quotation (RFQ) for SST39SF020A-55-4I-WHE-T 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-T reliable?
The price and inventory of SST39SF020A-55-4I-WHE-T 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-T is usually 5 days.
3.What payment methods are accepted for SST39SF020A-55-4I-WHE-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST39SF020A-55-4I-WHE-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST39SF020A-55-4I-WHE-T?
SST39SF020A-55-4I-WHE-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST39SF020A-55-4I-WHE-T 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-T?
For technical support, including SST39SF020A-55-4I-WHE-T 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-T requirements.
6.How does Aetrix verify that SST39SF020A-55-4I-WHE-T is sourced from the original manufacturer or authorized distributors?
All SST39SF020A-55-4I-WHE-T 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-T meets industry standards.
7.What is the process for return or replacement of SST39SF020A-55-4I-WHE-T?
All SST39SF020A-55-4I-WHE-T units undergo pre-shipment inspection (PSI). If there is an issue with SST39SF020A-55-4I-WHE-T, 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-T part is unused and in its original packaging.
Return procedure for SST39SF020A-55-4I-WHE-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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