Renesas AT25XE161D-SHN-T

Overview

AT25XE161D from Renesas Electronics is a 16-Mbit SPI serial flash memory IC supporting quad I/O, XiP (eXecute-in-Place), and flexible erase architecture. It operates across 1.65 V–3.6 V, delivers up to 133 MHz read speed in 1-4-4 mode, and features 256-byte page erase, 100,000 program/erase cycles, and -40°C to +85°C industrial temperature range. It serves as non-volatile storage for firmware boot code, embedded data logging, and direct code execution in resource-constrained edge devices.

For engineers reviewing the AT25XE161D datasheet, AT25XE161D pinout, AT25XE161D application, or AT25XE161D equivalent, key selection considerations include multi-I/O timing compatibility (1-1-2/1-1-4/1-4-4/0-4-4), ultra-low-power Deep Power-Down (8.2 µA) and Ultra Deep Power-Down (7 nA) modes, RMW command for SRAM-like writes, and hardware reset support via HOLD/RESET pin - all critical for battery-powered IoT nodes and industrial controllers requiring deterministic boot and secure firmware updates.

Technical Context

The AT25XE161D implements a dual-bus interface: standard SPI control lines (CS, SCK, SI, SO) plus four configurable I/O pins (I/O0–I/O3) enabling true quad I/O operation with 1-4-4 and 0-4-4 command formats. Its internal 256-byte SRAM buffer supports sequential programming and buffer-to-memory transfers without prior erase.

Memory architecture includes hierarchical protection (individual block lock, global lock, user-definable protected area), five status registers with volatile/non-volatile options, and JEDEC SFDP compliance for automatic configuration. Erase/program suspend/resume enables concurrent background operations while maintaining host responsiveness during long-duration flash operations.

Key Specifications

Pinout & Package

AT25XE161D-SHN-T uses an 8-pad Ultra-thin DFN package (2 mm × 3 mm × 0.6 mm), RoHS-compliant and optimized for space-constrained PCB layouts in portable and wearable electronics.

Key Features

Applications

Equivalent & Alternatives

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

Compared with W25Q16JVSNIQ and MT25QL128ABA8ESF-0SIT, the AT25XE161D uniquely combines 256-byte page erase, RMW command, active status interrupt, and three OTP registers - making it optimal for space-constrained, battery-powered, and security-critical applications where write efficiency, deterministic latency, and embedded trust anchors are mandatory.

Availability

AT25XE161D-SHN-T is available at Aetrix Electronics and suitable for industrial controllers, battery-powered IoT sensors, and medical diagnostic devices requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for AT25XE161D-SHN-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

Renesas Electronics is a Japanese semiconductor manufacturer specializing in microcontrollers, analog, power, and memory solutions for automotive, industrial, and IoT markets.

The AT25XE161D belongs to Renesas' serial flash memory product line, designed specifically for high-reliability, low-voltage, and multi-I/O applications demanding efficient firmware storage, secure boot, and deterministic execution in resource-constrained embedded systems.

FAQ

What is the maximum SPI clock frequency supported by the AT25XE161D-SHN-T?

The AT25XE161D-SHN-T supports up to 133 MHz in quad I/O (1-4-4) mode and 104 MHz in standard single-I/O (1-1-1) mode. This frequency is specified under 1.65 V–3.6 V supply and -40°C to +85°C operating conditions. The actual achievable clock rate depends on PCB layout, signal integrity, and selected transfer mode - with higher bandwidth available in dual and quad configurations due to parallel data lane utilization.

Does the AT25XE161D-SHN-T support hardware reset functionality?

Yes, the AT25XE161D-SHN-T supports hardware reset via the HOLD/RESET pin (I/O3). When asserted low for ≥20 ns while CS is high, it performs a synchronous reset that clears internal state, aborts ongoing operations, and returns the device to standby mode. This function complies with JEDEC standard hardware reset timing and is independent of SPI command execution.

How does the Read-Modify-Write (RMW) command in the AT25XE161D-SHN-T improve system efficiency?

The RMW command (0Ah) in the AT25XE161D-SHN-T enables atomic byte-level updates without requiring separate read, erase, and program steps. It internally reads a 256-byte page into its SRAM buffer, modifies specified bytes, and writes back - all in one SPI transaction. This eliminates host-side complexity and reduces total write latency by up to 70% compared to discrete operations, especially valuable in real-time data logging and configuration storage.

What power-saving modes are available on the AT25XE161D-SHN-T, and what are their typical current draws?

The AT25XE161D-SHN-T offers three low-power states: Standby (30 µA typical), Deep Power-Down (8.2 µA typical), and Ultra Deep Power-Down (7 nA typical). DPD and UDPD are entered via dedicated commands (B9h and 79h) and exited with specific wake sequences (ABh). These modes retain full memory content and register state, making them ideal for intermittent-sensing applications where the device spends >99% of time in sleep.

Can the AT25XE161D-SHN-T be used for eXecute-in-Place (XiP) applications, and what features enable this capability?

Yes, the AT25XE161D-SHN-T is explicitly designed for XiP operation. Key enablers include 0-4-4 continuous read mode (eliminating opcode transmission overhead), 133 MHz quad I/O bandwidth, and active status interrupt for precise timing control. Its memory array supports burst-aligned addressing and wrap modes, allowing seamless instruction streaming to CPUs without cache misses or wait states - validated for use with ARM Cortex-M and RISC-V cores in production systems.