Microchip Technology 24VL024HT/SN

Overview

24VL024HT/SN from Microchip Technology Inc. is a 2 Kbit I²C-compatible serial EEPROM organized as 256 × 8-bit memory, operating from 1.5V to 3.6V with 400 μA max active current and 1 μA max standby current. It features hardware write-protection for the upper half-array (80h–FFh), Schmitt-trigger inputs for noise immunity, and page-write capability for up to 16 bytes per cycle. It is used in low-power embedded systems requiring nonvolatile parameter storage, such as smart sensors and battery-powered IoT nodes.

For engineers reviewing the 24VL024HT/SN datasheet, 24VL024HT/SN pinout, 24VL024HT/SN application, or 24VL024HT/SN equivalent, key selection considerations include its 1.5V minimum VCC operation, half-array hardware write-protect via WP pin, I²C bus compatibility at 100/400 kHz, cascading support for up to eight devices on one bus, and TSSOP-8 packaging with RoHS compliance.

Technical Context

The 24VL024HT/SN implements a standard I²C slave interface with fixed 4-bit control code (1010b) and user-configurable A0–A2 address bits enabling up to eight devices on a shared bus. Its internal architecture includes a 16-byte page buffer, auto-erase/write logic, and voltage threshold detection that disables write operations below 1.2V.

Schmitt-trigger inputs on SDA and SCL pins provide hysteresis (≥0.05×VCC) and 50 ns spike suppression, while output slope control minimizes ground bounce. The device supports byte and page write modes, with self-timed write cycles completing in ≤5 ms, and uses acknowledge polling to detect write completion without fixed delay timing.

Key Specifications

Pinout & Package

24VL024HT/SN is supplied in an 8-pin SOIC package (3.90 mm body width, SN suffix), with lead pitch of 1.27 mm and RoHS-compliant matte tin plating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24VL024HT/SN, 24AA024H/SN trades 1.5V operation for wider VCC tolerance, while AT24C02C-SSHM-T offers higher clock speed but replaces hardware half-array protection with software-only methods - making 24VL024HT/SN uniquely suited for ultra-low-voltage, safety-critical parameter storage.

Availability

24VL024HT/SN is available at Aetrix Electronics and suitable for smart sensor calibration storage, industrial PLC configuration memory, and IoT edge node device identity applications requiring stable component supply, long-term data retention, and low-voltage compatibility.

Supply support for 24VL024HT/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 U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and memory products for embedded control applications.

The 24VL024HT/SN belongs to Microchip's low-voltage serial EEPROM product line, designed specifically for battery-powered, energy-constrained, and wide-input-voltage industrial systems requiring reliable nonvolatile storage.

FAQ

What is the minimum operating voltage for the 24VL024HT/SN?

The 24VL024HT/SN operates down to 1.5V, with guaranteed functionality across its full I²C timing specifications at this voltage. Below 1.8V, maximum clock frequency is limited to 100 kHz. Internal voltage detection disables write operations if VCC drops below approximately 1.2V, preventing data corruption during brownout conditions. This makes the 24VL024HT/SN suitable for coin-cell and energy-harvesting applications where supply voltage may dip near 1.5V.

How does the hardware write-protection work on the 24VL024HT/SN?

The 24VL024HT/SN uses the WP pin to enable hardware write-protection for memory addresses 80h–FFh (upper 128 bytes). When WP is tied to VCC, writes to this half-array are blocked; writes to addresses 00h–7Fh remain enabled. When WP is tied to VSS, full-array write access is permitted. Unlike software-based protection, this hardware mechanism is immune to firmware errors or bus glitches, providing deterministic security for calibration or security-critical data stored in the protected region.

Can multiple 24VL024HT/SN devices share the same I²C bus?

Yes, up to eight 24VL024HT/SN devices can be cascaded on a single I²C bus using the A0, A1, and A2 address pins. Each device is assigned a unique 3-bit chip address (A2 A1 A0), forming part of the 7-bit slave address (1010 A2 A1 A0). This allows contiguous addressing up to 16 Kbits across devices. Software must manage address boundaries explicitly, as sequential reads do not cross device boundaries - the 24VL024HT/SN does not auto-increment across physical devices.

What is the purpose of the Schmitt-trigger inputs on the 24VL024HT/SN?

The 24VL024HT/SN implements Schmitt-trigger inputs on SDA and SCL pins to improve noise immunity on electrically noisy I²C buses. These inputs provide hysteresis (≥0.05×VCC) and 50 ns spike suppression, rejecting transient noise that could otherwise cause false start/stop conditions or data corruption. This eliminates the need for external RC filters in industrial or automotive environments, simplifying layout and improving system reliability without sacrificing timing performance.

Does the 24VL024HT/SN support page write operations, and what is the buffer size?

Yes, the 24VL024HT/SN supports page write operations with a 16-byte internal buffer. A single I²C transaction can load up to 16 bytes into the buffer before initiating the self-timed write cycle. Page writes are constrained to within a single 16-byte physical page boundary - crossing a boundary causes wraparound within the current page. This feature reduces bus traffic by up to 16× compared to byte writes, improving system throughput and reducing MCU intervention time during bulk updates.