Microchip Technology 24AA01H-I/SN

Overview

24AA01H-I/SN from Microchip Technology Inc. is a 1 Kbit I²C-compatible serial EEPROM organized as 128 × 8-bit memory, operating from 1.7V to 5.5V with industrial temperature range (−40°C to +85°C), 400 kHz max clock frequency, and hardware write-protect for half-array (addresses 40h–7Fh). It enables nonvolatile storage in space-constrained embedded systems such as smart sensors and power management modules.

For engineers reviewing the 24AA01H-I/SN datasheet, 24AA01H-I/SN pinout, 24AA01H-I/SN application, or 24AA01H-I/SN equivalent, key selection criteria include low-voltage operation down to 1.7V, 1 μA standby current, Schmitt-trigger noise immunity on SDA/SCL, page-write capability (up to 8 bytes), and half-array hardware write-protection via WP pin.

Technical Context

The 24AA01H-I/SN implements a slave-only I²C interface compliant with standard-mode (100 kHz) and fast-mode (400 kHz) timing, supporting byte and page write operations with internal auto-incrementing address pointer. Its architecture includes on-chip charge pump for EEPROM programming, Schmitt-trigger inputs with 50 ns spike suppression, and VCC threshold detector disabling write logic below 1.5V.

Write protection is implemented via dedicated WP pin: tied to VSS enables full-array read/write; tied to VCC locks addresses 40h–7Fh against writes while permitting reads. A0–A2 pins are unconnected - no internal bonding - and may be left floating or tied to VSS/VCC without functional impact.

Key Specifications

Pinout & Package

24AA01H-I/SN uses an 8-lead plastic SOIC (3.90 mm body) package, RoHS-compliant and Pb-free. Pin functions are standardized across SOIC, PDIP, TSSOP, and MSOP variants.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA01H-I/SN, 24LC01BH-I/SN trades lower voltage capability for broader temperature qualification, while AT24C01D-SSHM-T replaces hardware write-protection with software control - impacting security assurance and fail-safe behavior in safety-critical contexts.

Availability

24AA01H-I/SN is available at Aetrix Electronics and suitable for smart sensor calibration storage, industrial PLC configuration memory, and medical device serial number registry requiring stable component supply across extended product lifecycles.

Supply support for 24AA01H-I/SN 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, headquartered in Chandler, Arizona, with global design and manufacturing infrastructure.

The 24AA01H belongs to Microchip's 24XX01H family of I²C serial EEPROMs, designed specifically for reliable, low-voltage, low-power nonvolatile data storage in space- and energy-constrained embedded systems.

FAQ

What is the minimum operating voltage for the 24AA01H-I/SN?

The 24AA01H-I/SN operates down to 1.7V DC, enabling direct integration with 1.8V microcontrollers and ultra-low-power sensor subsystems without level-shifting circuitry. This specification is guaranteed across the full industrial temperature range (−40°C to +85°C) and applies to both read and write operations, including page writes and acknowledge polling.

How does the WP pin function on the 24AA01H-I/SN?

On the 24AA01H-I/SN, the WP pin provides hardware-level write protection: when tied to VCC, writes to memory addresses 40h–7Fh are disabled while reads remain fully functional; when tied to VSS, full-array read/write access is enabled. This physical lock prevents accidental or malicious corruption of critical configuration data without firmware involvement.

Can the 24AA01H-I/SN be used in a 400 kHz I²C system powered at 1.8V?

Yes - the 24AA01H-I/SN supports 400 kHz I²C operation at VCC = 1.8V, meeting all AC timing specifications (e.g., THIGH ≥ 600 ns, TLOW ≥ 1300 ns) per DS22104A-page 3. Its Schmitt-trigger inputs and slope-controlled outputs ensure signal integrity even under marginal voltage conditions typical in battery-operated systems.

Are A0, A1, and A2 pins functional on the 24AA01H-I/SN?

No - A0, A1, and A2 pins are not internally connected on the 24AA01H-I/SN. They serve no role in device addressing or operation and may be left floating or tied to VSS/VCC without affecting functionality, timing, or reliability. The device uses fixed I²C slave address 1010xxx (where xxx are "don't care" bits).

What is the maximum number of bytes that can be written in a single page write cycle for the 24AA01H-I/SN?

The 24AA01H-I/SN supports up to 8 bytes per page write cycle. The internal page buffer holds these bytes until a STOP condition is issued, after which they are written simultaneously to contiguous addresses within the same physical page (00h–07h, 08h–0Fh, etc.). Crossing page boundaries causes wraparound, not continuation - software must enforce alignment.