Microchip Technology SST39VF040-70-4I-NHE-T

Overview

SST39VF040-70-4I-NHE-T from Microchip Technology is a 4-Mbit (512K × 8) CMOS Multi-Purpose Flash memory IC with 2.7V–3.6V single-supply write operation, 70 ns read access time, 100,000 program/erase cycles endurance, and uniform 4-Kbyte sector erase architecture. It serves as nonvolatile program/data storage in embedded microcontroller boot loaders, firmware update modules, and industrial HMI configuration memory.

For engineers reviewing the SST39VF040-70-4I-NHE-T datasheet, SST39VF040-70-4I-NHE-T pinout, SST39VF040-70-4I-NHE-T application, or SST39VF040-70-4I-NHE-T equivalent, this page delivers verified electrical specs, JEDEC-compliant x8 interface timing, SuperFlash® reliability data, and real-world use context for firmware storage, BIOS recovery, and field-upgradable control logic.

Technical Context

This device implements Microchip's proprietary SuperFlash® split-gate cell technology with thick-oxide tunneling injector, enabling fixed erase/program times independent of cycle count-unlike conventional Flash where timing degrades over endurance life. Its command set follows JEDEC-standard x8 pinouts and uses three-byte software data protection (SDP) for byte program and six-byte sequences for sector/chip erase.

It supports dual control modes: WE#- or CE#-initiated operations with identical timing compliance, and provides two end-of-write detection methods-Data# Polling (DQ7) and Toggle Bit (DQ6)-with validity windows defined by rising-edge timing of the fourth (program) or sixth (erase) control pulse.

Key Specifications

Pinout & Package

32-lead PLCC (Plastic Leaded Chip Carrier) and 32-lead TSOP (Thin Small Outline Package) options; SST39VF040-70-4I-NHE-T uses the standard 32-pin x8 Flash footprint compliant with JEDEC MO-118AA and MO-118AB outlines. Pin 1 is NC; pins 6 and 9 are NC for this density variant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Flash memory applications.

Compared with MX29LV040CTTI-70G and EN29LV040A-70TP, SST39VF040-70-4I-NHE-T delivers integrated VPP generation and 10× higher endurance-critical for remote-deployed systems needing secure, low-power, long-life firmware storage without external components or maintenance cycles.

Availability

SST39VF040-70-4I-NHE-T is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device configuration memory, automotive infotainment bootloader, network router firmware recovery, and embedded HMI application requiring stable component supply and long-term lifecycle support.

Supply support for SST39VF040-70-4I-NHE-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 Inc. is a leading provider of microcontrollers, analog devices, Flash memory, and FPGA solutions, serving industrial, automotive, communications, and consumer markets with vertically integrated silicon and development tools.

SST39VF040-70-4I-NHE-T belongs to Microchip's SST39VF family of Multi-Purpose Flash devices, engineered specifically for cost-sensitive, low-power embedded systems requiring robust firmware storage, field upgradability, and extended data retention without battery backup.

FAQ

What is the guaranteed minimum endurance rating for SST39VF040-70-4I-NHE-T?

The SST39VF040-70-4I-NHE-T is guaranteed for a minimum of 10,000 program/erase cycles per JEDEC A117 qualification, with typical performance exceeding 100,000 cycles. This endurance applies to the full memory array-not just individual sectors-and is validated across the industrial temperature range (-40°C to +85°C). The SST39VF040-70-4I-NHE-T achieves this via SuperFlash® split-gate cell architecture, which avoids oxide degradation mechanisms found in floating-gate alternatives.

Does SST39VF040-70-4I-NHE-T support both CE#- and WE#-controlled write operations?

Yes, SST39VF040-70-4I-NHE-T fully supports interchangeable CE#- and WE#-initiated program and erase operations, provided minimum pulse width and setup/hold timing requirements are met per Table 7-2. The device detects the last-active control signal (CE# or WE#) to latch address and data, enabling flexible timing integration with diverse microcontroller bus interfaces. This dual-control capability is explicitly confirmed in Section 3.2 and Figure 7-2/7-3 of the DS20005023E datasheet.

What is the function of pins A17 and A18 on SST39VF040-70-4I-NHE-T?

On SST39VF040-70-4I-NHE-T, A17 and A18 serve as address inputs for the full 512K × 8 memory space (A0–A18), with A18 designated as the Most Significant Address (AMS). During sector erase, AMS–A12 (i.e., A18–A12) collectively define the 4-Kbyte sector address. Per Note 1 in Table 2-1, AMS = A18 for SST39VF040 variants, confirming A18 is actively bonded and functional-not NC-as required for 4-Mbit addressing.

How does SST39VF040-70-4I-NHE-T implement write protection during power transitions?

SST39VF040-70-4I-NHE-T employs three-tiered hardware write protection: (1) noise/glitch immunity rejecting WE#/CE# pulses <5 ns, (2) VDD power-up/down detection inhibiting writes below 1.5V, and (3) write-inhibit mode triggered by OE# low, CE# high, or WE# high. These features operate independently of software commands and ensure zero inadvertent writes during brown-out, reset, or hot-insertion events-critical for maintaining firmware integrity in unattended systems.

Is SST39VF040-70-4I-NHE-T RoHS compliant and what package options are offered?

Yes, SST39VF040-70-4I-NHE-T is RoHS compliant per Microchip's DS20005023E documentation. It is offered in two industry-standard packages: 32-lead PLCC (plastic leaded chip carrier) and 32-lead TSOP (thin small outline package), both conforming to JEDEC MO-118AA (TSOP) and MO-118AB (PLCC) outlines. The "NHE-T" suffix denotes lead-free TSOP packaging with tape-and-reel delivery, qualified for Pb-free solder reflow up to +260°C for 10 seconds.