Microchip Technology 93C76CT-I/ST

Overview

93C76CT-I/ST from Microchip Technology is an 8Kbit, 4.5–5.5V serial EEPROM with 1024 × 8-bit organization, industrial temperature range (−40°C to +85°C), TSSOP-8 package, and Microwire-compatible 3-wire interface. It supports self-timed erase/write cycles, Ready/Busy status via DO pin, and power-on/off data protection - used in embedded system configuration storage and calibration data retention.

For engineers reviewing the 93C76CT-I/ST datasheet, 93C76CT-I/ST pinout, 93C76CT-I/ST application, or 93C76CT-I/ST equivalent, key selection criteria include VCC operating range (4.5–5.5V), 8-bit x1024 memory map, TSSOP-8 footprint compatibility, ERAL/WRAL command support, and PE pin write-protection logic for safety-critical firmware parameter storage.

Technical Context

This device implements a synchronous 3-wire Microwire interface with CS, CLK, and DI/DO lines. It uses internal auto-erase before write, requires EWEN/EWDS commands to enable/disable programming, and relies on external ORG and PE pins only in 'C' variants - but 93C76CT-I/ST is an 'A'-type variant, so ORG and PE are absent and memory is fixed at 8-bit organization.

Timing is governed by clock frequency up to 3 MHz (at VCC ≥ 4.5V), with TWC = 2 ms for erase/write cycles, TEC = 6 ms for ERAL, and TWL = 15 ms for WRAL. Data retention exceeds 200 years, and endurance is rated at 1 million erase/write cycles at 25°C and VCC = 5.0V.

Key Specifications

Pinout & Package

8-lead TSSOP (Thin Shrink Small Outline Package), Pb-free Matte Tin finish, body dimensions 4.4 mm × 3.0 mm × 1.2 mm, pitch 0.65 mm. Pin 1 marked by laser dot or bevelled corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 93C76CT-I/ST, the 93LC76AT-I/ST offers broader voltage flexibility while retaining identical pinout and instruction set, whereas the AT25080B-SSHL-T trades Microwire compatibility for SPI performance and different command architecture - making it a functional alternative only with firmware adaptation.

Availability

93C76CT-I/ST is available at Aetrix Electronics and suitable for industrial sensor calibration storage, embedded system configuration memory, and medical device safety parameter backup requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for 93C76CT-I/ST 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 components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 93Cxx EEPROM product line targets cost-sensitive, low-power nonvolatile storage in resource-constrained embedded systems - emphasizing reliability, long data retention, and simple 3-wire integration without protocol stacks.

FAQ

What is the memory organization of the 93C76CT-I/ST?

The 93C76CT-I/ST has a fixed 1024 × 8-bit (8 Kbit) organization. As an 'A' variant, it does not include ORG or PE pins - unlike 'C' variants - so word size is permanently set to 8-bit, simplifying address handling and eliminating external configuration logic.

Does the 93C76CT-I/ST support the ERAL (Erase All) command?

Yes, the 93C76CT-I/ST supports ERAL with a typical cycle time of 6 ms at 4.5–5.5V. The command erases the entire array to logic '1' and requires VCC ≥ 4.5V. Status is monitored via DO pin after CS reactivation, where low = busy and high = ready.

What is the maximum clock frequency supported by the 93C76CT-I/ST?

The 93C76CT-I/ST supports up to 3 MHz clock frequency when VCC is between 4.5V and 5.5V. At lower voltages (not applicable here), timing de-rates: 2 MHz at 2.5–4.5V, and 1 MHz at 1.8–2.5V - but 93C76CT-I/ST's 4.5–5.5V range ensures full 3 MHz operation.

Is the 93C76CT-I/ST pin-compatible with other 93xx76 variants in TSSOP-8?

Yes, all 93xx76 variants in TSSOP-8 (ST suffix) share identical pinout: CS, CLK, DI, DO, VSS, VCC, and two NC pins. However, 'C' variants add ORG and PE on pins 6 and 7 - so 93C76CT-I/ST (an 'A' variant) leaves those pins unconnected, maintaining mechanical compatibility but not functional equivalence.

How does the 93C76CT-I/ST handle power loss during a write operation?

The 93C76CT-I/ST incorporates hardware power-loss protection: its internal POR circuit blocks all write operations when VCC drops below ~3.8V. This prevents partial writes and data corruption, ensuring that only fully completed erase/write cycles commit to memory - critical for calibration and safety-critical data.