Microchip Technology 93C86B-I/P

Overview

93C86B-I/P from Microchip Technology Inc. is a 16K-bit, 1024 × 16-bit organization serial EEPROM with Microwire-compatible 3-wire interface, operating at 4.5–5.5 V, rated for Industrial temperature (−40°C to +85°C), and packaged in 8-lead PDIP. It features self-timed erase/write cycles, Ready/Busy status signaling via DO pin, and 1 million endurance cycles - used for nonvolatile parameter storage in embedded controllers and power management ICs.

For engineers reviewing the 93C86B-I/P datasheet, 93C86B-I/P pinout, 93C86B-I/P application, or 93C86B-I/P equivalent, key selection considerations include its fixed 16-bit word size (no ORG pin), absence of PE/ORG pins, 2 ms program cycle time at 4.5–5.5 V, industrial-grade temperature rating, and compatibility with legacy Microwire host controllers requiring deterministic timing and hardware-level data protection.

Technical Context

This device implements a synchronous serial Microwire interface with CS, CLK, DI, and DO signals - no ORG or PE pins present. All instructions (READ, WRITE, ERASE, ERAL, WRAL, EWEN, EWDS) are clocked on rising CLK edges, with opcode/address/data validated per instruction set for x16 organization.

It uses internal auto-erase-before-write logic and supports sequential read mode when CS remains high. Power-on reset circuitry disables write operations until explicit EWEN command is issued, and VCC detection threshold is 3.8 V to prevent corruption during brown-out conditions.

Key Specifications

Pinout & Package

8-lead PDIP (Plastic Dual In-line Package), 0.3 inch body width, through-hole mounting. Pin 1 marked by notch or dot; pin 1 identifier confirmed per Microchip DS21797L-page 18 package drawing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 93LC86B-I/P, the 93C86B-I/P trades wider voltage flexibility for improved noise immunity above 4.5 V; versus AT25128B-SSHL-T, it retains Microwire compatibility and hardware-ready signaling but offers lower density and deterministic 2 ms writes.

Availability

93C86B-I/P is available at Aetrix Electronics and suitable for industrial control systems, smart energy metering, automotive body electronics, and medical device calibration storage requiring stable component supply and long-term obsolescence management.

Supply support for 93C86B-I/P 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 devices, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 93Cxx series targets cost-sensitive, low-power embedded systems requiring simple, robust serial EEPROM functionality - optimized for Microwire host interfaces and industrial temperature reliability without feature bloat.

FAQ

What is the memory organization of the 93C86B-I/P?

The 93C86B-I/P has a fixed 1024 × 16-bit (16 Kbit) organization. Unlike 'C' variants, it lacks an ORG pin and does not support x8/x16 reconfiguration - it is hardwired for 16-bit words. This simplifies PCB layout and firmware address handling in systems designed for 16-bit data paths. The 93C86B-I/P datasheet confirms this in the Device Selection Table and Pin Function Table.

Does the 93C86B-I/P have a Program Enable (PE) pin?

No, the 93C86B-I/P does not include a Program Enable (PE) pin. PE is exclusive to 'C' versions (e.g., 93C86C). On the 93C86B-I/P, write protection is managed solely via the EWEN/EWDS instruction sequence - meaning firmware must explicitly issue EWEN before any erase or write operation. This is documented in Section 3.6 and the Device Selection Table of the 93C86B-I/P datasheet.

What is the maximum clock frequency supported by the 93C86B-I/P?

The 93C86B-I/P supports up to 3 MHz clock frequency when V_CC is 4.5–5.5 V. At this speed, minimum clock high/low times are 200 ns and 100 ns respectively. These AC timing limits are specified in Table 1-2 of the 93C86B-I/P datasheet and apply across the full industrial temperature range. Exceeding them risks command misinterpretation or data corruption.

How does the Ready/Busy status work on the 93C86B-I/P?

The 93C86B-I/P asserts Ready/Busy status on the DO pin: DO = low indicates ongoing erase/write; DO = high means operation complete. To read status, CS must be brought high for ≥250 ns after TCSL, then DO sampled on CLK rising edges. This hardware signaling eliminates need for fixed delays - critical for real-time systems. Details are in Sections 2.4, 2.7, and 3.4 of the 93C86B-I/P datasheet.

Is the 93C86B-I/P RoHS compliant and Pb-free?

Yes, the 93C86B-I/P is Pb-free and RoHS compliant, with Matte Tin (Sn) finish on its PDIP leads. This is explicitly stated in the Features section of the 93C86B-I/P datasheet (DS21797L) and confirmed in Microchip's packaging documentation. No lead content is present in the package or die attach materials, meeting EU Directive 2011/65/EU requirements.