Microchip Technology AT93C86A-10SU-2.7

Overview

AT93C86A-10SU-2.7 from Microchip Technology is a three-wire serial EEPROM with 16-Kbit capacity (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 for noise immunity in embedded control and configuration storage applications.

For engineers reviewing the AT93C86A-10SU-2.7 datasheet, AT93C86A-10SU-2.7 pinout, AT93C86A-10SU-2.7 application, or AT93C86A-10SU-2.7 equivalent, key selection considerations include voltage grade (2.7V min), SOIC-8 package, user-selectable x8/x16 organization via ORG pin, 2 MHz max clock at 5V, and self-timed 10 ms write cycle.

Technical Context

The AT93C86A-10SU-2.7 implements a synchronous three-wire serial interface (CS/SK/DI/DO) with rising-edge clocking on SK and supports both sequential read and status polling via DO pin. Its dual memory organization-configurable by the ORG pin-is decoded at power-on reset and remains fixed during operation.

Internal architecture includes a high-voltage generation circuit for EEPROM programming, address register and counter for automatic increment during sequential reads, and a power-on reset generator ensuring command rejection until VCC stabilizes above 1.5 V. Write operations require explicit EWEN instruction and are self-timed with no external erase step.

Key Specifications

Pinout & Package

AT93C86A-10SU-2.7 is packaged in an 8-lead SOIC (Small Outline Integrated Circuit) with 150-mil body width, compliant with JEDEC MS-012, and marked per Microchip's standard catalog truncation (86A) and voltage code (blank = 2.7V min).

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/SN, the AT93C86A-10SU-2.7 uniquely supports hardware-selectable x8/x16 organization and operates robustly at 2.7V with Schmitt-trigger inputs - making it optimal for cost-sensitive, noise-prone industrial systems where memory layout flexibility and electrical resilience are critical.

Availability

AT93C86A-10SU-2.7 is available at Aetrix Electronics and suitable for industrial motor drives, automotive body electronics, medical diagnostics, and programmable logic controllers requiring stable component supply with guaranteed long-term continuity.

Supply support for AT93C86A-10SU-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 memory solutions, with ISO 9001-certified manufacturing and global distribution.

The AT93C86A-10SU-2.7 belongs to Microchip's legacy Atmel serial EEPROM product line, designed specifically for space-constrained, low-power embedded systems requiring robust nonvolatile storage with minimal external components.

FAQ

What is the exact package type and footprint for AT93C86A-10SU-2.7?

The AT93C86A-10SU-2.7 uses an 8-lead SOIC package with 150-mil body width (JEDEC MS-012), 1.27 mm pitch, and standardized land pattern per Microchip Drawing C04-2057-SN Rev E. Pin 1 is marked by a beveled corner or dot; the NC pin (pin 7) must remain unconnected. This footprint is compatible with automated SMT assembly and reflow profiles for lead-free solder.

How does the ORG pin affect memory access in AT93C86A-10SU-2.7?

The ORG pin on AT93C86A-10SU-2.7 selects memory organization at power-on: tied to VCC → 1,024 words × 16 bits; tied to GND → 2,048 words × 8 bits. The setting is latched internally and cannot be changed dynamically. Unconnected ORG defaults to x16 mode via internal ~10 MΩ pull-up. Addressing and data width must match this configuration in host firmware.

Does AT93C86A-10SU-2.7 support true SPI communication?

No, AT93C86A-10SU-2.7 uses a proprietary three-wire serial interface (CS/SK/DI/DO) that is not SPI-compatible. It lacks MOSI/MISO separation and requires bit-banged GPIO control. While functionally similar, its command set (e.g., EWEN, ERAL) and timing (e.g., dummy bit prefix, status polling on DO) differ from standard SPI EEPROMs like the 25AA160C-I/SN.

What is the minimum VCC requirement and power-up behavior of AT93C86A-10SU-2.7?

AT93C86A-10SU-2.7 requires VCC ≥2.7V for guaranteed operation (as indicated by "-2.7" suffix). During power-up, its internal POR circuit holds the device in reset until VCC exceeds 1.5 V and stabilizes; the host must wait ≥100 µs after stability before issuing commands. Voltage slew rate must not exceed 0.1 V/µs to prevent metastability.

Can AT93C86A-10SU-2.7 be used in write-intensive applications?

Yes - AT93C86A-10SU-2.7 is rated for 1,000,000 write cycles and 100-year data retention at 55°C. For write-intensive use, implement wear leveling in firmware (e.g., rotating write addresses), ensure proper EWEN/EWDS command sequencing, and avoid repeated writes during power transitions. Its self-timed write cycle eliminates need for external timeout logic.