Microchip Technology AT24C01B-TH-B

Overview

AT24C01B-TH-B from Microchip Technology is a 1K-bit (128 × 8) two-wire serial EEPROM with 1.8V to 5.5V operation, 400 kHz I²C interface at 1.8V/2.5V/2.7V and 1 MHz at 5V, hardware write protection via WP pin, and 8-byte page write capability. It is used in industrial sensor calibration storage, embedded system configuration retention, and power-fail-safe parameter backup.

For engineers reviewing the AT24C01B-TH-B datasheet, AT24C01B-TH-B pinout, AT24C01B-TH-B application, or AT24C01B-TH-B equivalent, key selection considerations include TSSOP-8 package compatibility, NiPdAu lead finish for solderability and corrosion resistance, 1 million write cycles endurance, 100-year data retention, and I²C timing compliance across voltage grades.

Technical Context

The AT24C01B-TH-B implements a standard two-wire (I²C) serial interface with Schmitt-triggered, noise-filtered SCL and SDA inputs. It supports bidirectional data transfer using START/STOP conditions and ACK/NACK handshaking, with addressable device addressing via A0–A2 pins.

Internally organized as 128 words × 8 bits, it features self-timed write cycles (≤5 ms), partial page writes, and hardware write protection through the dedicated WP pin. Its low-power design delivers ≤3.0 µA standby current at 1.8V and ≤18.0 µA at 5.0V.

Key Specifications

Pinout & Package

AT24C01B-TH-B is packaged in an 8-lead Thin Shrink Small Outline Package (TSSOP, JEDEC MO-153 variation AA, type 8A2), with NiPdAu lead finish for enhanced solder wetting and corrosion resistance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C01D-SSHM-T and BR24G01NUX-5TR, the AT24C01B-TH-B uniquely combines TSSOP-8 compactness, NiPdAu finish, hardware WP, and full 1M-cycle endurance - making it optimal for industrial-grade, high-integrity configuration storage where board area and reliability are jointly constrained.

Availability

AT24C01B-TH-B is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded configuration storage, and power-fail parameter backup requiring stable component supply and long-term lifecycle support.

Supply support for AT24C01B-TH-B 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 is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with emphasis on industrial, automotive, and aerospace reliability standards.

The AT24C01B series belongs to Microchip's serial EEPROM product line, designed specifically for robust, low-voltage, I²C-based nonvolatile storage in space- and power-constrained embedded systems.

FAQ

What is the package type and lead finish of AT24C01B-TH-B?

The AT24C01B-TH-B uses an 8-lead Thin Shrink Small Outline Package (TSSOP, type 8A2) with NiPdAu (Nickel-Palladium-Gold) lead finish. This finish ensures excellent solderability, resistance to oxidation, and compatibility with both lead-free and traditional reflow profiles - critical for high-yield manufacturing of industrial control modules where AT24C01B-TH-B serves as configuration memory.

Does AT24C01B-TH-B support 1.8V operation and what is its maximum I²C clock speed at that voltage?

Yes, AT24C01B-TH-B supports 1.8V operation across its full specified range (1.8V to 5.5V). At 1.8V, its maximum guaranteed I²C clock frequency is 400 kHz - validated per AC characteristics Table 2-3. This enables reliable communication with ultra-low-power microcontrollers while maintaining noise immunity via Schmitt-triggered inputs, a key requirement in battery-operated AT24C01B-TH-B deployments.

How many write cycles can AT24C01B-TH-B endure, and what is its data retention period?

The AT24C01B-TH-B is rated for 1 million write cycles and guarantees 100 years of data retention at +25°C. These specifications are measured under standard test conditions (5.0V, 25°C) and apply directly to the AT24C01B-TH-B device. This endurance and retention make AT24C01B-TH-B suitable for applications such as utility meter calibration storage, where infrequent but mission-critical writes occur over decades of field operation.

What is the function of the WP pin on AT24C01B-TH-B, and how is it used?

The WP (Write Protect) pin on AT24C01B-TH-B is a hardware-level enable/disable control for write operations: when WP is driven HIGH (to VCC), all write commands (including page and byte writes) are inhibited, protecting stored data from accidental or malicious overwrite. When WP is LOW or floating (with internal pull-down), normal write functionality resumes. This feature is integral to AT24C01B-TH-B's role in safety-critical calibration storage where firmware bugs must not corrupt factory-set parameters.

Can AT24C01B-TH-B be used with multiple devices on the same I²C bus, and how is addressing handled?

Yes, AT24C01B-TH-B supports multi-device I²C bus configurations using its three hardware address pins (A0, A1, A2). These pins set the device's 3-bit slave address, allowing up to eight AT24C01B-TH-B units to share the same SDA/SCL lines without address conflict. Each AT24C01B-TH-B's address is fixed at power-up based on external pull-up/pull-down resistors - enabling scalable sensor node networks where each node stores unique calibration data in its own AT24C01B-TH-B.