Microchip Technology AT93C86A-10PU-2.7

Overview

AT93C86A-10PU-2.7 from Microchip Technology is a three-wire serial EEPROM with 16-Kbit capacity (configurable as 2,048 × 8 or 1,024 × 16), operating from 2.7V to 5.5V, rated for -40°C to +85°C industrial temperature range, and featuring Schmitt-trigger inputs, 2 MHz max clock rate at 5V, and self-timed write cycles ≤10 ms. It serves as nonvolatile configuration storage in embedded controllers, power management units, and sensor calibration modules.

For engineers reviewing the AT93C86A-10PU-2.7 datasheet, AT93C86A-10PU-2.7 pinout, AT93C86A-10PU-2.7 application, or AT93C86A-10PU-2.7 equivalent, key selection considerations include voltage grade (2.7V min), SOIC-8 package compatibility, ORG-pin configurable memory organization, noise-immune three-wire interface timing, and industrial-grade data retention (100 years).

Technical Context

The AT93C86A-10PU-2.7 implements a synchronous three-wire serial interface with Chip Select (CS), Serial Clock (SK), and bidirectional Data I/O (DI/DO) - where DI accepts commands and addresses, and DO outputs read data or Ready/Busy status. Its internal organization is dynamically selected via the ORG pin: tied to VCC for 1,024 × 16 mode or to GND for 2,048 × 8 mode.

It integrates on-chip high-voltage generation for EEPROM programming, Power-on Reset (POR) circuitry requiring ≥100 µs stabilization after VCC reaches stable ≥2.7V, and Schmitt-triggered inputs with filtered noise suppression. Write operations require explicit EWEN instruction enablement and are self-timed with tWP = 0.1–10 ms depending on VCC and temperature.

Key Specifications

Pinout & Package

AT93C86A-10PU-2.7 is packaged in an 8-lead plastic SOIC (Small Outline Integrated Circuit) with 150-mil body width, JEDEC MS-012AC compliant, pin pitch 1.27 mm, and RoHS-compliant lead-free finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M95128-WMN6TP and 25AA160C-I/P, the AT93C86A-10PU-2.7 uniquely offers hardware-selectable memory organization and true three-wire simplicity (single bidirectional data line), making it optimal for space-constrained designs needing flexible byte/word access without SPI peripheral overhead.

Availability

AT93C86A-10PU-2.7 is available at Aetrix Electronics and suitable for industrial motor drives, smart sensor nodes, programmable power supplies, and DIN-rail PLC I/O modules requiring stable component supply across extended product lifecycles.

Supply support for AT93C86A-10PU-2.7 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 company specializing in microcontrollers, analog devices, and nonvolatile memory solutions, with ISO 9001-certified manufacturing and global distribution.

The AT93C series was designed specifically for cost-sensitive, low-power embedded systems requiring reliable serial EEPROM with flexible memory mapping and robust industrial qualification - targeting applications where pin count, voltage flexibility, and long-term data integrity are critical.

FAQ

What does the "-10PU-2.7" suffix indicate in AT93C86A-10PU-2.7?

The "-10PU-2.7" suffix identifies the specific variant: "10" denotes the speed grade (10 MHz equivalent timing margin), "PU" specifies the 8-lead SOIC package (Plastic Narrow), and "-2.7" indicates the minimum operating voltage is 2.7V - distinguishing it from the 1.8V-grade AT93C86A-10PU-1.8. This variant is fully compatible with 3.3V and 5V systems and meets industrial temperature specifications.

Can AT93C86A-10PU-2.7 be used interchangeably with AT93C86A-10SU-2.7?

No - AT93C86A-10PU-2.7 uses an 8-lead SOIC package (PU), while AT93C86A-10SU-2.7 uses an 8-lead TSSOP package (SU). Though electrically identical and sharing the same pinout numbering, their physical dimensions, thermal characteristics, and PCB land patterns differ. Direct substitution requires verified mechanical compatibility and reflow profile validation for the TSSOP footprint.

How does the ORG pin affect memory addressing in AT93C86A-10PU-2.7?

When ORG is tied to VCC, AT93C86A-10PU-2.7 configures as 1,024 × 16-bit memory (address range 0x000–0x3FF); when tied to GND, it configures as 2,048 × 8-bit memory (address range 0x000–0x7FF). The host MCU must issue corresponding 11-bit (x8) or 10-bit (x16) addresses per the selected mode - mismatched addressing results in incorrect data access or wraparound behavior.

Is AT93C86A-10PU-2.7 compatible with standard SPI interfaces?

AT93C86A-10PU-2.7 uses a proprietary three-wire protocol distinct from standard SPI: it employs a single bidirectional data line (DI/DO) rather than separate MOSI/MISO, and uses unique opcodes (e.g., EWEN, ERAL) not found in SPI EEPROMs. While timing resembles SPI, direct connection to an SPI master requires firmware-level bit-banging or custom protocol translation - it is not plug-compatible with standard SPI peripherals.

What is the purpose of the NC pin (Pin 7) on AT93C86A-10PU-2.7?

Pin 7 is designated NC (No Connect) and is not bonded internally. It must be left unconnected or tied to GND per Microchip's layout guidance to avoid floating node susceptibility to noise. Unlike ORG or CS, it has no functional role in operation, timing, or configuration - its presence is solely for package symmetry and mechanical stability in the SOIC-8 outline.