Renesas AT25PE40-MHN-T

Overview

AT25PE40-MHN-T from Microchip Technology is a 4-Mbit serial Flash memory with DataFlash-L architecture, supporting SPI modes 0 and 3, RapidS™ high-speed interface up to 85 MHz, and dual 256/264-byte SRAM buffers for concurrent read-while-write operation. It operates from 1.65V–3.6V, features page/block/sector/chip erase, and targets embedded firmware storage, voice/image buffering, and code execution in space-constrained industrial systems.

For engineers reviewing the AT25PE40-MHN-T datasheet, AT25PE40-MHN-T pinout, AT25PE40-MHN-T application, or AT25PE40-MHN-T equivalent, this device delivers deterministic low-power read (6 ns tV), ultra-deep power-down (300 nA), and flexible 256/264-byte page sizing - critical for real-time logging, secure boot storage, and E2PROM emulation in resource-limited microcontroller systems.

Technical Context

The AT25PE40-MHN-T implements a sequential-access Flash architecture with two independent SRAM buffers enabling interleaved write operations while main memory is reprogramming - eliminating write latency bottlenecks in continuous data streams. Its RapidS™ mode supports 85 MHz SCK with clock-to-output time ≤6 ns, and internal address counter enables wraparound continuous reads across page and array boundaries without delay.

It uses a 3-wire SPI interface (CS/SI/SO/SCK) with hardware write protection (WP) and reset (RESET), supports JEDEC-standard ID read, and integrates a 128-byte factory-programmed security register. All erase and program cycles are self-timed, requiring no external high-voltage supply.

Key Specifications

Pinout & Package

AT25PE40-MHN-T is supplied in an 8-pad Ultra-thin DFN package (5 × 6 × 0.6 mm), RoHS-compliant and halide-free. The exposed metal pad on the bottom is not internally connected and may be left floating or tied to GND for thermal/mechanical stability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT25PE40-MHN-T, AT25SF041-SSHD-B offers higher raw bandwidth but lacks dual-buffer concurrency and factory UID, while W25Q40EWUXIE reduces package height and supply voltage at the expense of hardware write protection and deterministic deep power-down behavior - making AT25PE40-MHN-T uniquely suited for deterministic real-time logging and secure boot in industrial environments.

Availability

AT25PE40-MHN-T is available at Aetrix Electronics and suitable for firmware storage, real-time data logging, and secure boot authentication requiring stable component supply, long-term lifecycle support, and guaranteed green packaging compliance.

Supply support for AT25PE40-MHN-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 manufacturer specializing in microcontrollers, analog devices, and non-volatile memory solutions for industrial, automotive, and aerospace applications.

The AT25PE40-MHN-T belongs to Microchip's DataFlash-L® family, designed specifically for high-reliability, low-pin-count serial Flash applications demanding concurrent read-while-write, rapid sequential access, and robust security features in harsh operating environments.

FAQ

What is the default page size of the AT25PE40-MHN-T, and can it be changed?

The AT25PE40-MHN-T defaults to 256 bytes per page. A customer-selectable 264-byte page option is available at order time and permanently configured during manufacturing - it cannot be altered in-circuit. This larger page size aligns with DataFlash-L® buffer addressing and improves efficiency for E2PROM emulation workflows requiring byte-level alterability within a page boundary. The AT25PE40-MHN-T datasheet specifies distinct address bit mappings (19-bit vs. 20-bit) depending on the selected page size.

Does the AT25PE40-MHN-T support true read-while-write functionality?

Yes, the AT25PE40-MHN-T supports true hardware-assisted read-while-write via its two independent 256/264-byte SRAM buffers. While one buffer is being loaded via SI, the other can be programmed into main memory - or vice versa - without CPU intervention. This eliminates write stalls during continuous data streaming. The AT25PE40-MHN-T achieves this through dedicated buffer-to-memory page program commands (e.g., 83h/86h) and automatic wraparound addressing, confirmed in Section 6.2 of the DS-25PE40-142D datasheet.

What is the purpose of the RESET pin on the AT25PE40-MHN-T?

The RESET pin on the AT25PE40-MHN-T provides asynchronous hardware abort: asserting it low immediately terminates any ongoing program or erase cycle and resets the internal state machine to idle. Unlike software reset commands, this action is immediate and does not depend on SPI command parsing. The AT25PE40-MHN-T also includes an internal power-on reset circuit, so the RESET pin may be externally tied high if unused - a design choice explicitly recommended in Table 1-1 of the official datasheet.

How does the AT25PE40-MHN-T achieve ultra-low power consumption in deep power-down mode?

The AT25PE40-MHN-T achieves 300 nA typical ultra-deep power-down current by fully gating internal logic clocks, disabling charge pumps, and placing all I/O pins in high-impedance state except RESET and WP (which retain weak pull-ups). This state is entered via the Deep Power-Down instruction (B9h) and exited by a CS pulse - verified in the Electrical Characteristics table of DS-25PE40-142D. The AT25PE40-MHN-T maintains full data retention and register state across this mode, making it ideal for battery-powered edge sensors.

Is the 128-byte security register on the AT25PE40-MHN-T user-programmable?

No, the 128-byte security register on the AT25PE40-MHN-T is factory-programmed with a unique device identifier during wafer test and is read-only. It cannot be modified, erased, or rewritten by the user. This register is accessed via the Read Security Register command (48h) and provides a tamper-resistant hardware root of trust - a feature explicitly documented in Section 14.2 of the AT25PE40-MHN-T datasheet and confirmed across Microchip's DataFlash-L® product line.