Microchip Technology 24LC32A-I/P

Overview

24LC32A-I/P from Microchip Technology is a 32-Kbit I²C serial EEPROM organized as 4K × 8-bit memory, operating from 2.5V to 5.5V with 400 kHz clock support, 1 µA standby current, and hardware write-protection via the WP pin-used for nonvolatile parameter storage in industrial control modules.

For engineers reviewing the 24LC32A-I/P datasheet, 24LC32A-I/P pinout, 24LC32A-I/P application, or 24LC32A-I/P equivalent, this page delivers verified electrical specs, validated MSOP-8 pin mapping, real-world use cases in sensor calibration and firmware configuration, and two confirmed alternative parts with documented functional trade-offs.

Technical Context

The 24LC32A-I/P implements a two-wire I²C interface with Schmitt-trigger inputs and slope-controlled outputs to suppress noise and eliminate ground bounce. It supports standard (100 kHz) and fast-mode (400 kHz) clock rates depending on VCC level, and uses an internal address pointer for sequential read/write operations.

Its 32-byte page write buffer enables burst writes within a single physical page boundary (0–31, 32–63, etc.), while hardware write-protection is enforced by sampling the WP pin at the Stop bit of each write command-no software lock required.

Key Specifications

Pinout & Package

24LC32A-I/P is supplied in an 8-lead MSOP package (3 mm × 3 mm body, 0.65 mm pitch), with gull-wing leads and exposed pad optional per Microchip Drawing C04-111-MS Rev F.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C32D-SSHM-T and ST24C32-WDT6-TR, the 24LC32A-I/P uniquely combines industrial temperature rating, dedicated hardware write-protection, and Microchip's AEC-Q100-qualified manufacturing-making it the preferred choice for safety-critical and long-lifecycle deployments.

Availability

24LC32A-I/P is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded firmware configuration, and motor drive parameter storage requiring stable component supply across multi-year production programs.

Supply support for 24LC32A-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 U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and memory products, with global design centers and ISO 9001-certified wafer fabs.

The 24LC32A belongs to Microchip's serial EEPROM product line, engineered for reliable nonvolatile data storage in industrial, automotive, and consumer systems where write endurance and long-term data integrity are critical.

FAQ

What is the minimum VCC voltage required for 24LC32A-I/P operation?

The 24LC32A-I/P requires a minimum VCC of 2.5V for full functionality-including 400 kHz I²C operation and guaranteed write performance. Below 2.5V, the device is not specified to operate, unlike the 24AA32A variant which supports down to 1.7V. This threshold is defined in the Device Selection Table and Electrical Characteristics section of DS20001713P.

Does 24LC32A-I/P support page writes across multiple physical pages?

No. The 24LC32A-I/P restricts page writes to a single 32-byte physical page boundary (e.g., addresses 0x000–0x01F). Attempting to write across boundaries causes wraparound within the current page-not sequential storage into the next page. This behavior is explicitly documented in Section 6.3 and Figure 6-2 of the datasheet.

How does the WP pin function during active write cycles in 24LC32A-I/P?

The WP pin is sampled only at the Stop bit of each write command-not continuously. Once a write cycle begins, toggling WP has no effect until the next Stop condition. If WP is high at Stop, the command is acknowledged but no data is written, and the device immediately accepts new commands-ensuring deterministic fail-safe behavior.

Can multiple 24LC32A-I/P devices share the same I²C bus?

Yes. Up to eight 24LC32A-I/P units can coexist on one I²C bus using unique 3-bit chip address combinations (A2, A1, A0), yielding client addresses 0x50–0x57. This is enabled by hardwiring address pins to VSS/VCC and is confirmed in Section 2.1 and Figure 5-1 of DS20001713P.

Is 24LC32A-I/P qualified for automotive applications?

Yes. The 24LC32A-I/P is AEC-Q100 qualified for automotive use, as stated in the Features section of DS20001713P. This qualification covers stress testing for temperature cycling, humidity, and ESD-validating suitability for infotainment, body control, and ADAS subsystems.