Microchip Technology 24AA32AF-I/MS

Overview

24AA32AF-I/MS from Microchip Technology Inc. is a 32 Kbit I²C-compatible serial EEPROM organized as 4K × 8-bit memory, operating from 1.7V to 5.5V with industrial temperature range (–40°C to +85°C), 400 μA max read current, and 1 μA max standby current. It features hardware write-protect for the upper 1/4 array (C00h–FFFh), 32-byte page write buffer, and Schmitt-trigger inputs for noise immunity - deployed in battery-powered sensor nodes and embedded configuration storage.

For engineers reviewing the 24AA32AF-I/MS datasheet, 24AA32AF-I/MS pinout, 24AA32AF-I/MS application, or 24AA32AF-I/MS equivalent, key selection criteria include low-voltage operation down to 1.7V, quarter-array hardware write-protection, I²C clock compatibility up to 400 kHz, and MSOP-8 package footprint suitability for space-constrained PCB layouts.

Technical Context

The 24AA32AF-I/MS implements a two-wire I²C slave interface with fixed 7-bit device address prefix '1010' and three programmable chip-select bits (A0–A2), enabling up to eight devices on one bus. Its internal architecture includes a 32-byte page latch, self-timed erase/write cycle, and address pointer auto-increment for sequential reads.

Write protection is implemented via the WP pin: when tied to VCC, writes to addresses C00h–FFFh are inhibited while reads remain functional; WP sampling occurs at the Stop bit of each write command. The device uses CMOS EEPROM technology with >1 million erase/write cycles and >200 years data retention.

Key Specifications

Pinout & Package

24AA32AF-I/MS is housed in an 8-pin MSOP (Mini Small Outline Package) with 0.65 mm pitch, 3.0 mm × 3.0 mm body, and exposed pad option (not electrically connected). This thermally enhanced surface-mount package supports reflow soldering and fits high-density layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA32AF-I/MS, the 24LC32AF-I/MS offers identical functionality above 2.5V but excludes ultra-low-voltage support, while the AT24C32D-MAHM-T provides voltage compatibility at the cost of hardware write-protect granularity - making 24AA32AF-I/MS optimal for 1.7V–2.4V systems requiring secure calibration storage.

Availability

24AA32AF-I/MS is available at Aetrix Electronics and suitable for smart metering, industrial PLCs, medical sensor calibration, and automotive body control modules requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for 24AA32AF-I/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 components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 24AA32AF belongs to Microchip's serial EEPROM product line, engineered for ultra-low-power, high-reliability nonvolatile storage in battery-operated and industrial edge devices where voltage flexibility and data integrity are critical.

FAQ

What is the minimum operating voltage for the 24AA32AF-I/MS?

The 24AA32AF-I/MS operates down to 1.7V across its full industrial temperature range (–40°C to +85°C), enabling direct interface with 1.8V logic families and extending operational life in battery-powered applications where voltage sags occur. This specification is confirmed in the DC Characteristics table (Parameter D11, ICCS) of the DS22184A datasheet.

How does the write-protect function work on the 24AA32AF-I/MS?

The 24AA32AF-I/MS uses the WP pin to hardware-protect the upper 1/4 memory array (addresses C00h–FFFh): when WP is tied to VCC, write commands to that region are ignored while reads remain fully functional. WP state is sampled at the Stop bit of each write command, as specified in Section 6.3 of the DS22184A datasheet.

Can multiple 24AA32AF-I/MS devices share the same I²C bus?

Yes - the 24AA32AF-I/MS supports up to eight devices on one I²C bus using its three hardware address pins (A0, A1, A2), which configure the three LSBs of the 7-bit slave address (prefix '1010'). Each device must have a unique A0–A2 combination; this capability is documented in the Device Selection Table and Section 2.1 of DS22184A.

What is the maximum page write size supported by the 24AA32AF-I/MS?

The 24AA32AF-I/MS supports a 32-byte page write buffer, allowing up to 32 bytes to be loaded into the latch and written to contiguous memory locations in a single internal cycle. Page boundaries align to 32-byte offsets (e.g., 000h–01Fh), and crossing boundaries causes wraparound - details are in Section 6.2 and Figure 6-2 of DS22184A.

Is the 24AA32AF-I/MS RoHS compliant and lead-free?

Yes - the 24AA32AF-I/MS is Pb-free and RoHS compliant, as explicitly stated in the Features section of DS22184A (page 1). The MSOP-8 package uses matte tin (Sn) plating per JEDEC standards, and marking includes the '3e' Pb-free designation per Package Marking Information (page 14).