Renesas AT25XE161D-DWF

Overview

AT25XE161D from Renesas Electronics is a 16-Mbit SPI serial flash memory IC supporting 1.65 V–3.6 V operation, quad I/O (1-4-4/XiP) and dual/quad output modes, with 133 MHz max clock frequency and 256-byte page erase capability. It serves as non-volatile program storage or eXecute-in-Place (XiP) code memory in resource-constrained embedded systems.

For engineers reviewing the AT25XE161D datasheet, AT25XE161D pinout, AT25XE161D application, or AT25XE161D equivalent, key selection considerations include multi-I/O timing compliance, ultra-low-power deep power-down (7 nA), OTP security register support, and JEDEC SFDP parameter discovery for automated configuration.

Technical Context

The AT25XE161D implements a flexible SPI interface with hardware-compatible modes 0 and 3, enabling standard, dual-output (1-1-2), quad-output (1-1-4), quad-I/O (1-4-4), and XiP (0-4-4) transfers. Its internal architecture integrates a 256-byte SRAM buffer and supports nested erase/program suspend-resume operations.

Memory protection includes individual block lock/unlock commands (36h/39h), global lock/unlock (7Eh/98h), and user-definable protected regions at memory start or end. Status registers (SR1–SR6) provide volatile/non-volatile control of write enable, block protection, and power-down states.

Key Specifications

Pinout & Package

AT25XE161D is offered in multiple industry-standard packages: 8-lead SOIC (150-mil and 208-mil), 8-pad Ultra-thin DFN (2 × 3 × 0.6 mm), and 8-ball WLCSP (3 × 2 × 3 ball matrix). All variants share identical pin functions and electrical behavior.

Key Features

Applications

Equivalent & Alternatives

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

Compared with W25Q16JW and MT25QL128ABA, the AT25XE161D uniquely combines ultra-low-voltage operation (1.65 V), 256-byte page granularity, OTP security, and true XiP continuous-read mode-making it optimal for energy-constrained, security-aware, and latency-sensitive embedded designs.

Availability

AT25XE161D is available at Aetrix Electronics and suitable for industrial PLC firmware storage, IoT edge sensor node data logging, medical wearable boot memory, and automotive infotainment UI assets requiring stable component supply across extended product lifecycles.

Supply support for AT25XE161D 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 global semiconductor leader specializing in microcontrollers, analog, power, and memory solutions for industrial, automotive, and IoT markets.

The AT25XE161D belongs to Renesas' high-efficiency serial flash product line, engineered for ultra-low-power, secure, and high-speed code/data storage in battery-operated and safety-critical embedded systems.

FAQ

What is the minimum supply voltage supported by the AT25XE161D?

The AT25XE161D supports a minimum supply voltage of 1.65 V across its full operating temperature range (−40 °C to +85 °C). This enables reliable operation in single-cell Li-ion, LiFePO₄, and alkaline battery systems where voltage sag occurs during discharge. The AT25XE161D maintains full functionality-including 133 MHz quad-I/O reads and RMW operations-at this rail, unlike many competing flash devices that require ≥1.7 V.

Does the AT25XE161D support true eXecute-in-Place (XiP) operation?

Yes, the AT25XE161D supports true XiP via its 0-4-4 command format, which eliminates opcode transmission after initial setup and enables continuous burst reads directly into processor instruction fetch units. This is confirmed in Section 4.6 of the datasheet and validated by the presence of dedicated XiP timing diagrams (Figures 15–17). The AT25XE161D's 133 MHz clock and 256-byte SRAM buffer further reduce XiP latency versus standard 1-1-1 SPI flash.

How does the Read-Modify-Write (RMW) command (0Ah) function in the AT25XE161D?

The AT25XE161D's RMW command (0Ah) performs atomic byte-level updates without requiring separate read-erase-program sequences. Internally, it uses the 256-byte SRAM buffer to load, modify, and rewrite a full page in one transaction. This avoids exposing partial writes during power loss and reduces firmware update time by up to 70% compared to conventional methods-critical for robust data logging in the AT25XE161D.

What security features are implemented in the AT25XE161D?

The AT25XE161D integrates three 128-byte One-Time Programmable (OTP) security registers (programmable via 9Bh command), a factory-programmed 128-byte unique identifier, and hardware-enforced block protection with individual/global lock/unlock commands. These features allow binding cryptographic keys, storing device certificates, and preventing unauthorized firmware modification-verified in Sections 4.11 and 6.26 of the AT25XE161D datasheet.

Can the AT25XE161D enter ultra-low-power states, and what are the wakeup requirements?

Yes, the AT25XE161D supports Ultra Deep Power-Down (UDPD) with 7 nA typical current draw. Entry requires the 79h command; exit is triggered by CS deassertion followed by any valid command (e.g., 05h read status). The device retains full state and memory contents during UDPD, and wakeup latency is ≤100 µs-confirmed in Tables 7, 8, and 32 of the AT25XE161D datasheet.