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Microchip Technology SST39SF020A-70-4I-WHE
- Part No.:
- SST39SF020A-70-4I-WHE
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
SST39SF020A-70-4I-WHE.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:107
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Product details
Overview
SST39SF020A-70-4I-WHE from Microchip Technology is a 2 Mbit (256K × 8) CMOS Multi-Purpose Flash memory IC with 70 ns read access time, single 4.5–5.5 V supply operation, and uniform 4 KB sector-erase architecture. It implements SuperFlash split-gate technology for high reliability and is used in embedded system firmware storage, BIOS/UEFI code retention, and industrial controller configuration memory.
For engineers reviewing the SST39SF020A-70-4I-WHE datasheet, SST39SF020A-70-4I-WHE pinout, SST39SF020A-70-4I-WHE application, or SST39SF020A-70-4I-WHE equivalent, this page delivers verified technical context, JEDEC-compliant x8 interface behavior, sector-level erase timing, endurance and retention specs, and real-world design implications for legacy 5 V microcontroller systems.
Technical Context
The SST39SF020A-70-4I-WHE uses SST's proprietary SuperFlash technology with split-gate cells and thick-oxide tunneling injectors, enabling fixed 18 ms sector-erase and 70 ms chip-erase times independent of program/erase cycle count. It supports standard JEDEC x8 flash command sets including three-byte software data protection for byte-program and six-byte sequences for sector/chip-erase.
It operates across -40°C to +85°C (Industrial grade), requires no external VPP, generates internal programming voltage, and features dual end-of-write detection via Toggle Bit (DQ6) and Data# Polling (DQ7). Its 32-pin PLCC package matches industry-standard footprint compatibility for socketed 5 V memory upgrades.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (256K × 8) - supports full firmware images up to 256 KB in legacy 8-bit bus systems. |
| Read Access Time | 70 ns - enables direct interfacing with 14 MHz microcontrollers without wait states. |
| Supply Voltage | 4.5–5.5 V - compatible with standard 5 V logic rails; no auxiliary voltage required. |
| Endurance | 100,000 program/erase cycles - sufficient for field firmware updates over 10+ years of industrial use. |
| Data Retention | >100 years - ensures nonvolatile storage integrity across product lifecycle without refresh. |
| Sector Size | 4 KB uniform sectors - allows granular firmware patching without erasing entire memory array. |
| Standby Current | 30 µA typical - minimizes power draw in sleep-mode embedded controllers. |
Pinout & Package
Package: 32-lead PLCC (Plastic Leaded Chip Carrier), RoHS compliant, 1.27 mm pitch, surface-mountable with through-hole socket compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address Inputs | 17-bit address bus supporting 256K × 8 addressing; A16 is MSB for SST39SF020A. |
| DQ0–DQ7 | Data Input/Output | 8-bit bidirectional data bus with tri-state outputs controlled by CE# and OE#. |
| CE# | Chip Enable | Active-low chip select; device enters standby (30 µA) when high. |
| OE# | Output Enable | Active-low output gate; controls data bus visibility during read cycles only. |
| WE# | Write Enable | Active-low control for byte-program and erase command latching; initiates internal timing. |
| VDD | Power Supply | +5 V supply (4.5–5.5 V); powers all internal logic and charge pumps. |
| VSS | Ground | Reference ground for all I/O and core circuitry. |
| NC | No Connection | Pins 17 and 31 are unconnected; must be left floating or tied to ground per layout best practice. |
Key Features
| Feature | Design Value |
|---|---|
| SuperFlash Technology | Split-gate cell architecture delivers fixed erase/program times unaffected by wear, eliminating software de-rating. |
| Hardware + Software Data Protection | Glitch immunity (<5 ns pulses rejected), VDD power-up/down detection, and mandatory JEDEC-compliant 3-/6-byte command sequences prevent accidental writes. |
| Uniform 4 KB Sectors | Enables selective firmware updates without full chip erase-critical for field-deployed industrial controllers. |
| Toggle Bit & Data# Polling | Real-time write completion detection via DQ6/DQ7 eliminates need for fixed delay loops, improving system responsiveness. |
| TTL I/O Compatibility | Direct interface with legacy 5 V microcontrollers (e.g., 8051, Z80, 68K families) without level-shifting circuitry. |
Applications
| Industrial PLC Firmware Storage | Legacy PC BIOS/UEFI Code Memory |
|---|---|
|
Use Scenario: Storing ladder logic firmware and I/O configuration tables in programmable logic controllers operating in harsh factory environments. IC Role / Device Role / Timing Role: Nonvolatile code storage with sector-erase capability enabling remote firmware patches without full reflash downtime. Use Value: 100,000-cycle endurance and >100-year data retention ensure long-term reliability across PLC service life; 70 ns access supports deterministic scan-cycle timing. |
Use Scenario: Holding boot firmware and hardware initialization code in desktop/server motherboards using legacy ISA/LPC bus interfaces. IC Role / Device Role / Timing Role: Primary BIOS ROM replacement in 5 V systems requiring JEDEC x8 pinout and software-compatible command set. Use Value: Direct drop-in compatibility with existing socketed 27Cxxx EPROM layouts; no PCB redesign needed for upgrade to flash-based BIOS. |
| Medical Device Configuration Memory | Automotive Body Control Module (BCM) Calibration Storage |
|
Use Scenario: Retaining user-adjustable calibration parameters and safety-critical device settings in portable diagnostic equipment. IC Role / Device Role / Timing Role: Secure, tamper-resistant configuration store with hardware write inhibit during power transitions. Use Value: Industrial temperature range (-40°C to +85°C) and 30 µA standby current support battery-backed operation and thermal stability in clinical environments. |
Use Scenario: Storing vehicle-specific calibration maps (e.g., lighting profiles, window auto-up thresholds) in BCMs subject to automotive qualification requirements. IC Role / Device Role / Timing Role: Field-updatable parameter memory accessed via 8-bit microcontroller bus during vehicle service. Use Value: Sector-erase granularity allows updating individual calibration banks without corrupting unrelated functions; RoHS compliance meets automotive material standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV040B-70EC | 4 Mbit (512K × 8), 70 ns, 3.0 V core (3.0–3.6 V I/O), requires VPP = 12 V for programming. | Requires dual-supply design and external high-voltage generation; not pin-compatible due to different voltage domains and pinout. | Select only if migrating to 3.3 V systems and higher density is required; board redesign mandatory. |
| MX29LV040CT-70G | 4 Mbit (512K × 8), 70 ns, single 3.0 V supply, no VPP needed, but uses different command set and lacks sector-erase uniformity. | Not JEDEC x8 command-compatible; requires firmware driver modification; 64 KB block erase vs. 4 KB sectors. | Choose for cost-sensitive 3.3 V designs where sector granularity is noncritical; not a drop-in replacement. |
Compared with AM29LV040B-70EC and MX29LV040CT-70G, the SST39SF020A-70-4I-WHE uniquely combines 5 V single-supply operation, JEDEC x8 pin/command compatibility, uniform 4 KB sectors, and fixed-timing SuperFlash - making it the only viable option for maintaining legacy 5 V embedded systems without hardware or software rework.
Availability
SST39SF020A-70-4I-WHE is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy PC BIOS/UEFI code memory, and medical device configuration memory requiring stable component supply across extended product lifecycles.
Supply support for SST39SF020A-70-4I-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 connectivity.
The SST39SF020A-70-4I-WHE belongs to Microchip's legacy SuperFlash MPF (Multi-Purpose Flash) product line, designed specifically for reliable, low-power, pin-compatible replacement of EPROMs and earlier-generation flash in 5 V industrial and computing systems.
FAQ
What is the memory organization of the SST39SF020A-70-4I-WHE?
The SST39SF020A-70-4I-WHE is organized as 256K × 8, delivering 2 Mbit total capacity. Its 17 address lines (A0–A16) directly map to the full 256K address space, with A16 serving as the most significant bit. This structure supports byte-wide data transfers on an 8-bit bus and aligns with JEDEC-standard x8 flash memory addressing conventions used in legacy microcontroller systems.
Does the SST39SF020A-70-4I-WHE require an external VPP voltage for programming?
No, the SST39SF020A-70-4I-WHE does not require an external VPP voltage. It integrates on-chip charge pump circuitry that generates the necessary high voltage for programming and erasing operations from the single 4.5–5.5 V VDD supply. This eliminates the need for external high-voltage circuitry and simplifies system design compared to older EPROM or early flash devices.
What is the operating temperature range for the SST39SF020A-70-4I-WHE?
The SST39SF020A-70-4I-WHE is rated for Industrial temperature operation from -40°C to +85°C. This specification is confirmed in Table 5 of the official datasheet (DS20005022C) and applies to all DC and AC performance parameters under the specified 4.5–5.5 V supply conditions, ensuring reliable functionality in demanding embedded environments.
How does the SST39SF020A-70-4I-WHE indicate completion of a byte-program operation?
The SST39SF020A-70-4I-WHE provides two hardware-supported methods: Data# Polling (monitoring DQ7, which toggles until completion) and Toggle Bit (monitoring DQ6, which alternates between 0 and 1 during programming). Both are valid after the rising edge of the fourth WE# or CE# pulse and enable precise, interrupt-driven write status detection without fixed delays.
Is the SST39SF020A-70-4I-WHE RoHS compliant?
Yes, the SST39SF020A-70-4I-WHE is RoHS compliant, as explicitly stated in the datasheet feature list and product description. All package variants-including the 32-lead PLCC version denoted by the "WHE" suffix-meet the EU Restriction of Hazardous Substances Directive requirements, with lead-free terminations and compliant molding compounds.
SST39SF020A-70-4I-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:
- 70 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-70-4I-WHE FAQ
1.How can I place an order for SST39SF020A-70-4I-WHE through Aetrix?
Please submit a Request for Quotation (RFQ) for SST39SF020A-70-4I-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-70-4I-WHE reliable?
The price and inventory of SST39SF020A-70-4I-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-70-4I-WHE is usually 5 days.
3.What payment methods are accepted for SST39SF020A-70-4I-WHE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST39SF020A-70-4I-WHE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST39SF020A-70-4I-WHE?
SST39SF020A-70-4I-WHE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST39SF020A-70-4I-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-70-4I-WHE?
For technical support, including SST39SF020A-70-4I-WHE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST39SF020A-70-4I-WHE requirements.
6.How does Aetrix verify that SST39SF020A-70-4I-WHE is sourced from the original manufacturer or authorized distributors?
All SST39SF020A-70-4I-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-70-4I-WHE meets industry standards.
7.What is the process for return or replacement of SST39SF020A-70-4I-WHE?
All SST39SF020A-70-4I-WHE units undergo pre-shipment inspection (PSI). If there is an issue with SST39SF020A-70-4I-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-70-4I-WHE part is unused and in its original packaging.
Return procedure for SST39SF020A-70-4I-WHE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SST39SF020A-70-4I-WHE Tags
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