Asahi Kasei Microdevices/AKM AK93C95AF

Overview

AK93C95AF from Asahi Kasei is a 32Kbit (2048 × 16) serial CMOS EEPROM with SPI-compatible 4-wire interface (CS, SK, DI, DO), operating from 1.8V to 5.5V, supporting 100K write cycles and 10-year data retention, used for configuration storage in industrial controllers and embedded sensor nodes.

For engineers reviewing the AK93C95AF datasheet, AK93C95AF pinout, AK93C95AF application, or AK93C95AF equivalent, this page delivers verified electrical specs, validated instruction set behavior, package-confirmed pin functions, and real-world use context for low-density non-volatile memory selection.

Technical Context

The AK93C95AF implements a synchronous serial interface with chip-select–gated operation, where READ/WRITE instructions are initiated by a Start Bit (Logic "1") followed by Op Code and 11-bit address (A10–A0), enabling sequential 16-bit access with automatic address increment during read.

It integrates an on-chip charge pump for internal high-voltage generation during write, supports software-controlled write protection via EWEN/EWDS instructions, and outputs Busy/Ready status on the DO pin-low during self-timed programming (max 8ms at VCC ≥ 4.5V), high when complete-valid only while CS is high.

Key Specifications

Pinout & Package

AK93C95AF is housed in an 8-pin plastic SOP (Small Outline Package) with 1.27mm pitch, suitable for automated PCB assembly and space-constrained designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AK93C95AF, the Microchip 25LC320 offers identical density and package but excludes 1.8V operation-limiting use in ultra-low-power designs-while the CAT25320 trades instruction-level security for pinout simplicity and slightly relaxed timing, making AK93C95AF preferable where deterministic write control and dual-voltage flexibility are critical.

Availability

AK93C95AF is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, and smart meter firmware parameter storage requiring stable component supply across multi-year production cycles.

Supply support for AK93C95AF 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

Asahi Kasei Microdevices (formerly AKM) is a Japanese semiconductor company specializing in analog, sensor, and memory ICs for industrial, automotive, and medical applications.

The AK93C series was designed as cost-optimized, wide-VCC serial EEPROMs targeting space- and power-constrained embedded systems needing reliable, low-density non-volatile storage without complex interface logic.

FAQ

What is the maximum clock frequency supported by AK93C95AF?

The AK93C95AF supports a minimum SK cycle time of 1.0 µs at VCC = 4.5–5.5V, corresponding to a maximum clock frequency of 1 MHz. At lower voltages (1.8–2.0V), the minimum cycle time increases to 4.0 µs (250 kHz). These values are specified in the AC Electrical Characteristics table and must be observed to ensure reliable instruction execution and data integrity.

Does AK93C95AF require an external high-voltage supply for write operations?

No, AK93C95AF does not require an external high-voltage supply. It integrates an on-chip charge pump that generates the necessary programming voltage internally from the standard VCC supply (1.8V–5.5V), eliminating the need for additional components or board space typically associated with older EEPROM architectures.

How does the Busy/Ready status work on AK93C95AF's DO pin?

After initiating a WRITE instruction, the DO pin serves as a Busy/Ready indicator while CS remains high: DO = low indicates ongoing self-timed programming; DO = high confirms completion and readiness for the next instruction. This status is only valid during active CS and ceases when CS goes low or a new Start Bit is received.

Can AK93C95AF be used in place of AK93C85AF or AK93C10AF without hardware changes?

No-while all three share the same 8-pin SOP package and pinout, AK93C95AF has a 11-bit address space (A10–A0), whereas AK93C85AF uses 10 bits (A9–A0) and AK93C10AF uses 12 bits (A11–A0). Host firmware must match the correct address width; incorrect addressing will result in wraparound or incomplete memory access.

What is the function of the NC pin on AK93C95AF?

The NC (No Connect) pin on AK93C95AF is internally unconnected and must remain unattached on the PCB. Connecting it to any voltage rail, ground, or signal may cause undefined behavior or functional failure, as confirmed in the official DAM02E-01 datasheet pin arrangement diagram and absolute maximum ratings section.