Microchip Technology AT93C86A-10SU-2.7-T

Overview

AT93C86A-10SU-2.7-T from Microchip Technology is a 16-Kbit three-wire serial EEPROM organized as either 2,048 × 8 or 1,024 × 16, operating from 2.7V to 5.5V, with industrial temperature range (−40°C to +85°C), 2 MHz max clock rate at 5V, and 1,000,000 write cycles endurance. It serves as nonvolatile configuration storage in embedded controllers, power management units, and sensor calibration modules.

For engineers reviewing the AT93C86A-10SU-2.7-T datasheet, AT93C86A-10SU-2.7-T pinout, AT93C86A-10SU-2.7-T application, or AT93C86A-10SU-2.7-T equivalent, key selection considerations include voltage-grade compatibility (2.7V min), ORG-pin-configurable memory width, self-timed 10 ms max write cycle, Schmitt-triggered noise-immune inputs, and SOIC-8 package footprint constraints.

Technical Context

The AT93C86A-10SU-2.7-T implements a synchronous three-wire interface (CS/SK/DI/DO) with chip-select–gated communication and rising-edge–synchronized data latching on both input and output. Its dual-organization architecture is statically selected via the ORG pin-tied to VCC for 1,024 × 16 mode or GND for 2,048 × 8 mode-enabling flexible byte- or word-oriented access without internal address translation logic.

Internal operation relies on on-chip high-voltage generation for EEPROM programming, eliminating external VPP requirements. A Power-on Reset (POR) circuit enforces a minimum 100 µs delay after VCC stabilization before command acceptance, and all write/erase operations are fully self-timed with Ready/Busy status reported on DO when CS is reasserted post-command initiation.

Key Specifications

Pinout & Package

AT93C86A-10SU-2.7-T is packaged in an 8-lead SOIC (Small Outline Integrated Circuit) with 150-mil body width, standard JEDEC MS-012AC outline, and lead finish compatible with RoHS-compliant reflow soldering.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M95128-DRMN6TP/K and 25AA160C-I/SN, the AT93C86A-10SU-2.7-T uniquely offers hardware-selectable memory width and Microwire compatibility in SOIC-8, making it optimal for legacy or resource-constrained systems requiring minimal I/O count and configurable data width without protocol translation.

Availability

AT93C86A-10SU-2.7-T is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and smart metering applications requiring stable component supply, long-term data retention, and RoHS-compliant packaging.

Supply support for AT93C86A-10SU-2.7-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

Microchip Technology is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and memory products, with ISO 9001-certified manufacturing and global distribution.

The AT93C86A-10SU-2.7-T belongs to Microchip's legacy AT93Cxx serial EEPROM family, designed specifically for cost-sensitive, low-pin-count embedded systems needing reliable nonvolatile storage with minimal external components and flexible memory addressing.

FAQ

What voltage range does the AT93C86A-10SU-2.7-T support, and how does the "-2.7-T" suffix relate to it?

The AT93C86A-10SU-2.7-T supports a VCC operating range of 2.7V to 5.5V. The "-2.7-T" suffix explicitly denotes the 2.7V minimum supply voltage grade, distinguishing it from the 1.8V-grade variant (e.g., AT93C86A-10SU-1.8-T). This ensures guaranteed functionality down to 2.7V, making AT93C86A-10SU-2.7-T suitable for 3.3V systems with marginal rail tolerance or legacy 5V designs with LDO dropout considerations.

How is memory organization selected on the AT93C86A-10SU-2.7-T, and what happens if the ORG pin is left unconnected?

Memory organization on the AT93C86A-10SU-2.7-T is selected by the ORG pin: tied to VCC for 1,024 × 16 mode, tied to GND for 2,048 × 8 mode. If left unconnected, an internal ~10 MΩ pull-up resistor asserts ORG high, defaulting AT93C86A-10SU-2.7-T to 1,024 × 16 mode. This hardware-selectable configuration avoids firmware overhead and enables single-BOM flexibility across multiple host architectures.

Does the AT93C86A-10SU-2.7-T require an external high-voltage supply for write operations?

No, the AT93C86A-10SU-2.7-T integrates on-chip high-voltage generation circuitry, eliminating the need for external VPP. All write and erase operations are performed using only the VCC supply (2.7–5.5V). This simplifies system design by removing charge pumps or boost converters, reducing bill-of-materials cost and PCB area-key advantages of AT93C86A-10SU-2.7-T in space-constrained applications.

What is the maximum clock frequency supported by the AT93C86A-10SU-2.7-T, and how does it vary with supply voltage?

The AT93C86A-10SU-2.7-T supports up to 2 MHz clock frequency when VCC is 4.5–5.5V, 1 MHz at 2.7–5.5V, and 250 kHz across the full 1.8–5.5V range. Since AT93C86A-10SU-2.7-T is rated for 2.7V minimum, its practical maximum is 1 MHz under nominal 3.3V operation-sufficient for fast configuration loading while maintaining timing margin across voltage and temperature extremes.

How does the AT93C86A-10SU-2.7-T indicate write completion, and can the host monitor this without polling?

The AT93C86A-10SU-2.7-T outputs Ready/Busy status on the DO pin when CS is reasserted after initiating a write or erase command. A logic '1' indicates completion; '0' indicates ongoing operation. While polling is supported, AT93C86A-10SU-2.7-T does not provide interrupt or callback signaling-host firmware must either poll DO or implement a fixed 10 ms timeout, as the maximum write cycle is guaranteed ≤10 ms.