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Microchip Technology SST39SF040-45-4C-WHE-T
- Part No.:
- SST39SF040-45-4C-WHE-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
SST39SF040-45-4C-WHE-T.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SST39SF040-45-4C-WHE-T from Microchip Technology is a 4 Mbit (512K × 8) CMOS Multi-Purpose Flash memory IC with single 4.5–5.5V supply operation, 55 ns read access time, and JEDEC-standard x8 parallel interface. It features uniform 4 KByte sector erase, 100,000 program/erase endurance cycles, and >100 years data retention - deployed in embedded firmware storage for industrial controllers and legacy BIOS modules.
For engineers reviewing the SST39SF040-45-4C-WHE-T datasheet, SST39SF040-45-4C-WHE-T pinout, SST39SF040-45-4C-WHE-T application, or SST39SF040-45-4C-WHE-T equivalent, this page delivers verified package mapping (32-lead TSOP), sector-erase timing (25 ms typ), byte-program time (20 µs max), hardware/software data protection, and direct JEDEC x8 compatibility for drop-in replacement analysis.
Technical Context
The SST39SF040-45-4C-WHE-T 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 command set uses standard microprocessor write sequences with WE#/CE# edge-triggered latching for address and data.
It supports three software-controlled operations: Byte-Program (three-byte unlock + address/data), Sector-Erase (six-byte sequence with sector address on AMS–A12), and Chip-Erase (six-byte sequence with 5555H address). End-of-write detection is implemented via Data# Polling (DQ7) and Toggle Bit (DQ6), both valid after the fourth (program) or sixth (erase) WE# pulse.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512K × 8) - supports full BIOS/firmware images up to 512 KB in x8 parallel bus systems. |
| Read Access Time | 55 ns - enables direct connection to 14 MHz microcontrollers without wait states. |
| Supply Voltage | 4.5–5.5 V - compatible with legacy 5 V logic rails and eliminates need for dedicated programming voltage. |
| Endurance | 100,000 program/erase cycles - validated per JEDEC A117, sufficient for field firmware updates over 10+ years. |
| Data Retention | >100 years - meets JEDEC A103, ensuring nonvolatile storage integrity across product lifecycle. |
| Sector Size | Uniform 4 KByte sectors - allows granular firmware patching without full chip erase. |
| Operating Temp | -40°C to +85°C (Industrial grade) - qualified for use in motor drives, PLCs, and outdoor telecom equipment. |
Pinout & Package
Package: 32-lead TSOP (8 mm × 14 mm), RoHS-compliant, surface-mount.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | A0–A17 used for full 512K addressing; A18 is MSB but NC on TSOP package per Figure 3. |
| DQ0–DQ7 | Data I/O | Bidirectional x8 data bus; tri-stated when CE# or OE# high; latched during write. |
| CE# | Chip Enable | Active-low device select; must be low for read/write; high = standby (100 µA typical). |
| OE# | Output Enable | Active-low output gate; controls DQ bus drive; high = high-impedance. |
| WE# | Write Enable | Active-low write control; initiates command latching and internal program/erase timing. |
| VDD | Power Supply | 4.5–5.5 V supply; powers all internal logic and charge pumps for erase/program. |
| VSS | Ground | Reference return path for all signals and internal circuitry. |
| NC | No Connect | Pins 1, 16, 31, 32 on TSOP are unconnected - must be left floating or grounded per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| SuperFlash Technology | Split-gate cell with thick-oxide injector enables fixed 20 µs byte-program and 25 ms sector-erase times - no de-rating over lifetime. |
| JEDEC x8 Compatibility | Fully compliant pinout and command set - interoperable with existing 27Cxxx/29Cxxx socket designs and firmware drivers. |
| Hardware + Software Protection | Glitch immunity (<5 ns), VDD lockout (<2.5 V), and mandatory 3-/6-byte unlock sequences prevent accidental writes during power transitions. |
| End-of-Write Detection | DQ7 (Data# Polling) and DQ6 (Toggle Bit) provide deterministic status feedback without external timers or polling delays. |
| Low Standby Current | 100 µA (CMOS input mode) - reduces system power in sleep states for battery-backed applications. |
Applications
| Industrial PLC Firmware Storage | Legacy PC BIOS Memory |
|---|---|
Use Scenario: Storing ladder logic firmware and configuration parameters in programmable logic controllers operating in harsh factory environments. IC Role / Device Role / Timing Role: Nonvolatile parallel boot memory mapped at reset vector; accessed via 8-bit ISA-style bus with 55 ns timing margin. Use Value: 100,000-cycle endurance supports remote firmware updates over 15+ years; -40°C to +85°C rating ensures reliability near motors and drives. | Use Scenario: Replacing obsolete 27C040 EPROMs in ATX motherboard BIOS chips requiring in-system reprogramming. IC Role / Device Role / Timing Role: x8 parallel boot ROM with JEDEC-standard pinout and 55 ns access - directly socket-compatible with legacy 40-pin DIP layouts using adapter. Use Value: Single 5 V supply eliminates UV-eraser or 12 V programming hardware; sector erase enables partial BIOS patching without full chip reflash. |
| Telecom Line Card Configuration | Medical Device Calibration Data |
Use Scenario: Holding DSP initialization tables and port mapping data on carrier-grade line cards subject to frequent field upgrades. IC Role / Device Role / Timing Role: Parallel-configurable memory accessed by TI C6000 DSP via EMIF with CE#/OE# handshaking. Use Value: Uniform 4 KByte sectors allow updating individual port profiles without disrupting active call processing; >100 yr retention guarantees calibration persistence across device lifetime. | Use Scenario: Storing sensor calibration coefficients and safety-critical firmware signatures in Class II medical infusion pumps. IC Role / Device Role / Timing Role: Secure, tamper-resistant nonvolatile memory with hardware write inhibit during power-up/down sequences. Use Value: Dual protection (noise immunity + 3-byte unlock) prevents corruption during brown-out events; RoHS compliance meets IEC 60601-1 environmental requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar parallel flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MX29LV040CTTI-70G | 4 Mbit, 3.0 V core (3.0–3.6 V), 70 ns access, bottom-boot sector architecture | Requires level-shifting for 5 V systems; boot-sector locking differs from uniform-sector SST39SF040 | Select only if migrating to 3.3 V platform and redesigning power delivery. |
| AM29LV040B-55REI | 4 Mbit, 3.0 V core (2.7–3.6 V), 55 ns access, 64 KByte sectors, no hardware write protect | Higher sector granularity limits patching flexibility; lacks VDD lockout and glitch immunity | Acceptable for cost-sensitive 3.3 V designs where firmware update frequency is low. |
Compared with MX29LV040CTTI-70G and AM29LV040B-55REI, the SST39SF040-45-4C-WHE-T uniquely delivers 5 V operation with uniform 4 KByte sectors, hardware-based write inhibition, and fixed-timing SuperFlash - making it the only option for legacy 5 V systems requiring field-upgradable, high-reliability firmware storage without PCB redesign.
Availability
SST39SF040-45-4C-WHE-T is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy PC BIOS replacement, telecom line card configuration, and medical device calibration data retention requiring stable component supply across extended product lifecycles.
Supply support for SST39SF040-45-4C-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 global semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with emphasis on industrial, automotive, and aerospace reliability standards.
The SST39SF040-45-4C-WHE-T belongs to Microchip's legacy SST SuperFlash parallel NOR flash product line, designed specifically for pin-compatible replacement of obsolete EPROMs and early-generation flash in 5 V embedded systems requiring long-term firmware stability.
FAQ
What is the maximum operating frequency supported by SST39SF040-45-4C-WHE-T?
The SST39SF040-45-4C-WHE-T does not operate at a clock frequency - it is an asynchronous parallel flash memory. Its performance is defined by access timing: 55 ns read cycle time (TRC) and 20 µs maximum byte-program time. System timing is governed by CE#, OE#, and WE# signal setup/hold requirements per Table 12, not by a clock signal.
Does SST39SF040-45-4C-WHE-T require an external VPP programming voltage?
No. The SST39SF040-45-4C-WHE-T integrates internal charge pumps and requires only a single 4.5–5.5 V supply (VDD) for both read and write operations. Internal VPP generation eliminates the need for external high-voltage programming sources, simplifying system design and reducing BOM count.
How many address lines does SST39SF040-45-4C-WHE-T use in TSOP package?
The SST39SF040-45-4C-WHE-T uses 18 address lines (A0–A17) for full 512K × 8 addressing. Per Figure 3, A18 is the most significant address bit for the SST39SF040 family but is designated NC (no connect) on the 32-lead TSOP package - the device internally maps A18 based on density, not pin presence.
Is SST39SF040-45-4C-WHE-T compatible with 27C040 EPROM sockets?
Yes - the SST39SF040-45-4C-WHE-T shares identical pinout, voltage levels, and command protocol with JEDEC-standard 27C040 EPROMs. When mounted in a 40-pin DIP socket via appropriate adapter, it functions as a direct, in-system reprogrammable replacement with no firmware or hardware changes required.
What is the sector erase time specification for SST39SF040-45-4C-WHE-T?
The SST39SF040-45-4C-WHE-T has a typical sector-erase time of 25 ms (Table 12), with uniform 4 KByte sector architecture. This value is fixed and independent of program/erase cycle count due to SuperFlash technology - unlike floating-gate alternatives whose erase time degrades over lifetime.
SST39SF040-45-4C-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:
- 4Mbit
- Memory Organization:
- 512K 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-TSOP
SST39SF040-45-4C-WHE-T FAQ
1.How can I place an order for SST39SF040-45-4C-WHE-T through Aetrix?
Please submit a Request for Quotation (RFQ) for SST39SF040-45-4C-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 SST39SF040-45-4C-WHE-T reliable?
The price and inventory of SST39SF040-45-4C-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 SST39SF040-45-4C-WHE-T is usually 5 days.
3.What payment methods are accepted for SST39SF040-45-4C-WHE-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST39SF040-45-4C-WHE-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST39SF040-45-4C-WHE-T?
SST39SF040-45-4C-WHE-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST39SF040-45-4C-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 SST39SF040-45-4C-WHE-T?
For technical support, including SST39SF040-45-4C-WHE-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST39SF040-45-4C-WHE-T requirements.
6.How does Aetrix verify that SST39SF040-45-4C-WHE-T is sourced from the original manufacturer or authorized distributors?
All SST39SF040-45-4C-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 SST39SF040-45-4C-WHE-T meets industry standards.
7.What is the process for return or replacement of SST39SF040-45-4C-WHE-T?
All SST39SF040-45-4C-WHE-T units undergo pre-shipment inspection (PSI). If there is an issue with SST39SF040-45-4C-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 SST39SF040-45-4C-WHE-T part is unused and in its original packaging.
Return procedure for SST39SF040-45-4C-WHE-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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