Renesas AT25SF161B-SSHD-B

Overview

AT25SF161B-SSHD-B from Renesas Electronics is a 16-Mbit SPI serial flash memory IC supporting dual I/O and quad I/O operations, 108 MHz max clock frequency, 2.5–3.6 V supply, and execute-in-place (XiP) capability for embedded boot and code storage. It delivers fast read performance via 1-4-4 and 0-4-4 command modes and integrates OTP security registers and SFDP support.

For engineers reviewing the AT25SF161B-SSHD-B datasheet, AT25SF161B-SSHD-B pinout, AT25SF161B-SSHD-B application, or AT25SF161B-SSHD-B equivalent, key selection factors include quad-SPI timing compliance, 4 kB/32 kB/64 kB erase granularity, deep power-down current (1.5 µA), JEDEC-standard ID, and WLCSP/SOIC/DFN package compatibility with industrial temperature range (−40°C to +85°C).

Technical Context

The AT25SF161B-SSHD-B implements a flexible SPI interface supporting modes 0 and 3, with configurable dual-output (1-1-2), dual-I/O (1-2-2), quad-output (1-1-4), and quad-I/O (1-4-4, 0-4-4) read protocols. Its internal architecture includes SRAM data buffers, Y/X decoders, and control logic enabling continuous read wrap (8/16/32/64-byte) and XiP-optimized command sequences.

Memory protection is enforced via user-definable protected regions at array start/end, controlled by WP pin and Status Register bits SRP0/SRP1. Security is enhanced by three 256-byte OTP registers accessible via dedicated commands (42h/44h/48h/4Bh), while SFDP register (5Ah) enables host auto-configuration of timing and feature parameters.

Key Specifications

Pinout & Package

AT25SF161B-SSHD-B is packaged in an 8-ball WLCSP (3 × 2 × 3 grid array, 0.4 mm pitch), measuring 3.0 mm × 2.0 mm × 0.6 mm, optimized for space-constrained portable and IoT designs.

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 AT25SF161B-SSHD-B offers optimal balance of industrial-grade reliability, integrated security (OTP + SFDP), and compact WLCSP packaging - making it ideal for cost- and space-sensitive embedded systems where 16 Mbit capacity and −40°C to +85°C operation are primary constraints.

Availability

AT25SF161B-SSHD-B is available at Aetrix Electronics and suitable for industrial PLCs, IoT edge gateways, medical imaging devices, and automotive ADAS modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for AT25SF161B-SSHD-B 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 delivering microcontrollers, analog, power, and memory solutions for automotive, industrial, infrastructure, and IoT markets.

The AT25SF161B product line targets high-reliability embedded systems needing robust, low-power serial flash with advanced security and XiP optimization - especially where space, thermal, and long-term supply stability are critical.

FAQ

What is the maximum clock frequency supported by the AT25SF161B-SSHD-B during quad-I/O read operations?

The AT25SF161B-SSHD-B supports a maximum clock frequency of 108 MHz for all read operations, including quad-I/O (1-4-4 and 0-4-4) modes. This enables theoretical peak throughput of 54 MB/s (108 MHz × 4 bits ÷ 8) and is validated under 2.5–3.6 V supply and −40°C to +85°C conditions per the official Renesas datasheet DS-AT25SF161B-188 Rev. H.

Does the AT25SF161B-SSHD-B support execute-in-place (XiP) functionality, and what features enable it?

Yes, the AT25SF161B-SSHD-B explicitly supports execute-in-place (XiP). Key enablers include quad-SPI interface (1-4-4/0-4-4), continuous read mode eliminating opcode overhead, and 108 MHz maximum clock speed - all documented in the Product Overview section of the Renesas datasheet. These features minimize instruction fetch latency when booting or running code directly from flash memory.

How many One-Time Programmable (OTP) security registers does the AT25SF161B-SSHD-B include, and what is their size?

The AT25SF161B-SSHD-B includes three independent 256-byte One-Time Programmable (OTP) security registers, totaling 768 bytes of immutable storage. These registers are accessed via dedicated commands (42h program, 44h erase, 48h read, 4Bh unique ID) and are used for cryptographic keys, calibration data, or device-specific identifiers as confirmed in the datasheet Sections 10 and 12.1.

What package type is used for the AT25SF161B-SSHD-B, and what are its mechanical dimensions?

The AT25SF161B-SSHD-B uses an 8-ball WLCSP (Wafer-Level Chip Scale Package) with a 3 × 2 × 3 grid array, measuring 3.0 mm × 2.0 mm × 0.6 mm. This is specified in the Ordering Information section (page 60) of the Renesas datasheet DS-AT25SF161B-188 Rev. H and distinguishes it from SOIC and DFN variants in the same family.

Can the AT25SF161B-SSHD-B be configured for hardware write protection, and how is it implemented?

Yes, the AT25SF161B-SSHD-B supports hardware write protection via the WP pin in conjunction with Status Register bits SRP0 and SRP1. When QE = 0 and SRP1/SRP0 = 0/1, asserting WP low locks Status Registers; full array protection is enabled by setting CMP = 1 in Status Register 2. This behavior is defined in datasheet Sections 9.3–9.4 and Table 5, ensuring robust prevention of accidental firmware overwrite.