Microchip Technology 93C86AT-E/MS

Overview

93C86AT-E/MS from Microchip Technology is a 16 Kbit (2048 × 8-bit) Microwire-compatible serial EEPROM with industrial temperature range (–40°C to +85°C), 4.5–5.5 V supply, and MSOP-8 package. It features self-timed erase/write cycles, 1,000,000 endurance cycles, >200-year data retention, and power-on/off data protection. Used for configuration storage in embedded controllers and sensor calibration modules.

For engineers reviewing the 93C86AT-E/MS datasheet, 93C86AT-E/MS pinout, 93C86AT-E/MS application, or 93C86AT-E/MS equivalent, key selection criteria include VCC operating range (4.5–5.5 V), 8-bit organization, MSOP-8 footprint compatibility, write-protection absence (no PE/ORG pins), and industrial-grade reliability for nonvolatile memory in space-constrained designs.

Technical Context

This device implements a synchronous 3-wire Microwire interface (CS, CLK, DI, DO) with start-bit detection and opcode-based command execution. It supports READ, WRITE, ERASE, ERAL, WRAL, EWEN, and EWDS instructions - all clocked on rising CLK edges with strict timing windows (e.g., TCKH ≥ 200 ns at 4.5–5.5 V).

Internal logic includes an address decoder, mode decode logic, and output buffer with Ready/Busy status signaled via DO pin during erase/write operations. Power-on reset circuitry disables programming until VCC exceeds 3.8 V, and standby current is ≤1 µA when CS = low and CLK = DI = 0 V.

Key Specifications

Pinout & Package

8-pin MSOP (150-mil width) package with exposed pad (optional VSS connection). Pin 1 marked by laser dot; pin 1 ID corner located at top-left when notch faces up.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 93C86A-I/MS, the 93C86AT-E/MS adds automotive temperature qualification without changing pinout, timing, or instruction set. Compared with AT25080B-MAHL-T, it retains Microwire compatibility and doubles memory size but lacks wide-VCC flexibility and requires dedicated 3-wire controller support.

Availability

93C86AT-E/MS is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and medical device manufacturing requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for 93C86AT-E/MS 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 Inc. is a leading provider of microcontrollers, analog, and Flash-IP solutions, serving industrial, automotive, and consumer markets with high-reliability silicon and development tools.

The 93Cxx series targets cost-sensitive, space-constrained embedded systems needing robust, low-pin-count serial EEPROM for configuration, calibration, and event logging - optimized for Microwire-compatible host controllers.

FAQ

What is the memory organization of the 93C86AT-E/MS?

The 93C86AT-E/MS is a fixed 2048 × 8-bit (16 Kbit) device with no ORG pin - it exclusively supports 8-bit word organization. Unlike 'C' variants, it does not support 16-bit mode or external word-size selection. This simplifies design by eliminating ORG pin routing and level-setting logic.

Does the 93C86AT-E/MS have write-protection pins like PE or ORG?

No. The 93C86AT-E/MS is an 'A' variant and does not include PE (Program Enable) or ORG (Organization) pins. Write protection is implemented solely through the EWEN/EWDS instruction sequence and VCC voltage threshold (programming disabled below 3.8 V). Pins 6 and 7 are NC and must remain unconnected.

What is the maximum clock frequency supported by the 93C86AT-E/MS?

The 93C86AT-E/MS supports up to 3 MHz clock frequency when VCC is 4.5–5.5 V. At this rate, READ and WRITE operations require 22 and 22 clock cycles respectively, enabling effective serial throughput of approximately 240 kbit/s. Timing margins must comply with TCKH ≥ 200 ns and TCKL ≥ 100 ns.

How does the Ready/Busy status work on the 93C86AT-E/MS?

The DO pin outputs Ready/Busy status during erase/write cycles: logic low indicates ongoing operation; logic high signals completion. To sample status, CS must be brought high for ≥250 ns after TCSL, then DO is sampled on CLK rising edges. After completion, issuing a Start bit followed by CS low clears the status flag.

Is the 93C86AT-E/MS compatible with 3.3 V systems?

No. The 93C86AT-E/MS requires VCC between 4.5 V and 5.5 V and is not functional at 3.3 V. Its minimum VCC threshold for programming is 3.8 V, and DC characteristics (e.g., VIH, VOL) are specified only for 4.5–5.5 V operation. For 3.3 V systems, consider the 93LC86A-I/MS (2.5–5.5 V) instead.