Microchip Technology SST25PF040C-40I/SN18GVAO

Overview

SST25PF040C-40I/SN18GVAO from Microchip Technology is a 4 Mbit SPI serial flash memory IC with SuperFlash technology, supporting single-supply operation (2.3–3.6 V), 40 MHz high-speed read, dual I/O interface, and AEC-Q100 automotive qualification. It delivers 100,000 program/erase cycles and >20 years data retention for firmware storage in automotive ECUs and industrial controllers.

For engineers reviewing the SST25PF040C-40I/SN18GVAO datasheet, SST25PF040C-40I/SN18GVAO pinout, SST25PF040C-40I/SN18GVAO application, or SST25PF040C-40I/SN18GVAO equivalent, key selection criteria include SPI Mode 0/3 compatibility, 256-byte page programming, 4 KB sector erase granularity, hold/write-protect pin functionality, and USON-8 (2×3 mm) package suitability for space-constrained PCB layouts.

Technical Context

This device implements a four-wire SPI-compatible serial interface with dedicated SI/SO pins and dual I/O capability via SIO0/SIO1, enabling Fast-Read Dual-Output (3BH) and Fast-Read Dual I/O (BBH) instructions at up to 40 MHz. Its SuperFlash split-gate cell architecture enables lower programming current and faster erase times versus conventional NOR flash.

Internal control logic manages write-enable latching (WEL), busy-state polling, and software/hardware write protection through BP0–BP2, TB, and BPL bits in the status register - all configurable under CE# active-low conditions with support for sector-, block-, and chip-level erase commands.

Key Specifications

Pinout & Package

Package: 8-contact USON (2 mm × 3 mm), RoHS-compliant, moisture-sensitive level 3 (MSL3).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SST25PF040C-40I/SN18GVAO, W25Q40EW offers voltage flexibility but sacrifices automotive reliability and hold functionality, while S25FL004A provides faster throughput and QSPI readiness at the cost of pin count and board area - making SST25PF040C-40I/SN18GVAO optimal for cost-sensitive, space-constrained AEC-Q100 designs requiring dual I/O efficiency.

Availability

SST25PF040C-40I/SN18GVAO is available at Aetrix Electronics and suitable for automotive ECU firmware storage, industrial PLC configuration backup, and medical device bootloader applications requiring stable component supply across extended product lifecycles.

Supply support for SST25PF040C-40I/SN18GVAO 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 microcontroller, mixed-signal, analog, and Flash-IP solutions, serving automotive, industrial, communications, and consumer markets with vertically integrated silicon and development tools.

The SST25PF040C-40I/SN18GVAO belongs to Microchip's Serial Flash 25 Series, designed specifically for reliable, low-power, high-speed firmware and parameter storage in automotive and industrial systems where AEC-Q100 compliance and small-footprint packaging are critical.

FAQ

What is the maximum clock frequency supported by SST25PF040C-40I/SN18GVAO during high-speed read operations?

The SST25PF040C-40I/SN18GVAO supports up to 40 MHz during High-Speed Read (0BH), Fast-Read Dual-Output (3BH), and Fast-Read Dual I/O (BBH) operations. This is confirmed in the datasheet DS20005397E, Section 5.2–5.4, and enables sub-100 µs access to 256-byte firmware pages. The 40 MHz limit applies only when using these enhanced read instructions - standard Read (03H) is rated at 25 MHz.

Does SST25PF040C-40I/SN18GVAO support both SPI Mode 0 and Mode 3, and how is mode selection handled?

Yes, SST25PF040C-40I/SN18GVAO is compatible with both SPI Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1), as stated in DS20005397E Section 4.0. No configuration or pin strapping is required - the device automatically adapts to the host controller's clock polarity and phase settings. Input data is always sampled on the rising edge of SCK, and output data is driven on the falling edge, regardless of mode.

What package type is used for SST25PF040C-40I/SN18GVAO, and what are its key mechanical dimensions?

SST25PF040C-40I/SN18GVAO uses an 8-contact USON (Ultra Thin Small Outline No-lead) package measuring 2.0 mm × 3.0 mm × 0.55 mm (max height), per Figure 2-1 and Package Code SN18GVAO in DS20005397E. It features wettable flank leads for automated optical inspection (AOI) and is rated MSL3 per J-STD-020, requiring bake conditioning before reflow if exposed beyond floor life.

How does the HOLD# function operate in SST25PF040C-40I/SN18GVAO, and what timing constraints apply?

In SST25PF040C-40I/SN18GVAO, HOLD# suspends an active SPI transaction without deselecting the device - the internal address pointer and command state are preserved. As specified in Section 4.0.1 and Figure 4-2, HOLD# must transition low only when SCK is low; releasing HOLD# (high) must also occur during SCK low to avoid bus contention. SO enters high-impedance during hold, while SI and SCK may be driven freely.

What write protection mechanisms are implemented in SST25PF040C-40I/SN18GVAO, and how do they interact?

SST25PF040C-40I/SN18GVAO implements three-tiered write protection: (1) Hardware WP# pin enabling BPL bit lock-down, (2) Software-configurable BP0–BP2/TB bits defining protected memory regions (top/bottom blocks), and (3) Status register write-disable via BPL=1. Table 4-3 confirms that full memory protection requires BP2=1, while partial protection uses combinations of BP0–BP2 and TB. All protections are nonvolatile and persist across power cycles.