Microchip Technology 34AA02T-I/MS

Overview

34AA02T-I/MS from Microchip Technology is a 2 Kbit I²C-compatible serial EEPROM with permanent and resettable software write-protection for the lower 128 bytes (00h–7Fh), hardware write-protection via WP pin, 1.7V to 5.5V single-supply operation, and 100 nA typical standby current. It supports up to eight cascaded devices on one bus and delivers 16-byte page writes in 3 ms typical.

For engineers reviewing the 34AA02T-I/MS datasheet, 34AA02T-I/MS pinout, 34AA02T-I/MS application, or 34AA02T-I/MS equivalent, key selection criteria include voltage range compatibility (1.7–5.5 V), I²C clock support up to 400 kHz, industrial temperature rating (–40°C to +85°C), MSOP-8 package footprint, and dual-layer write protection architecture for secure configuration storage.

Technical Context

The 34AA02T-I/MS implements a 256 × 8-bit memory array organized as a single block, accessed via a bidirectional 2-wire I²C interface where it operates exclusively as a slave device. Its internal address pointer auto-increments during sequential reads, enabling contiguous byte streaming across the full 256-byte space.

Write protection is enforced at three independent levels: hardware (WP pin tied to VCC locks entire 00h–FFh array), resettable software (SWP/CSWP commands protect 00h–7Fh), and permanent software (PSWP command irreversibly locks 00h–7Fh). Schmitt-trigger inputs on SCL/SDA and input filtering suppress noise, while slope control on outputs minimizes ground bounce.

Key Specifications

Pinout & Package

34AA02T-I/MS is housed in an 8-lead MSOP (Micro Small Outline Package) with 0.65 mm lead pitch, 3.0 mm × 3.0 mm body, and exposed pad option (not electrically connected). The package is RoHS-compliant and rated for industrial temperature operation (–40°C to +85°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C02D-SSHM-T and BR24G02NUX-10, the 34AA02T-I/MS uniquely combines hardware WP pin, resettable SWP, and permanent PSWP - delivering three independent protection mechanisms ideal for safety-critical or regulatory-mandated configuration integrity.

Availability

34AA02T-I/MS is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, and automotive body control modules requiring stable component supply, long-term data retention, and multi-layer write protection.

Supply support for 34AA02T-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 34AA02 family was designed specifically for secure, low-voltage, I²C-based configuration storage in space-constrained, power-sensitive embedded systems - emphasizing write-protection flexibility and industrial reliability.

FAQ

What is the maximum I²C clock frequency supported by the 34AA02T-I/MS?

The 34AA02T-I/MS supports up to 400 kHz I²C clock frequency at VCC ≥ 1.8 V. At VCC < 1.8 V, the maximum clock rate drops to 100 kHz per Microchip DS22029F specification. This dual-speed capability ensures interoperability across 1.8 V and higher-voltage I²C buses without external level shifting.

How does hardware write-protection work on the 34AA02T-I/MS?

Hardware write-protection on the 34AA02T-I/MS is controlled by the WP pin: when tied to VCC, the entire 256-byte memory array (00h–FFh) becomes read-only; when tied to VSS, full read/write access is restored. This protection remains active regardless of software write-protect register state or power cycling.

Can the 34AA02T-I/MS be used in battery-powered applications with ultra-low power requirements?

Yes - the 34AA02T-I/MS draws only 100 nA typical standby current and operates down to 1.7 V, making it well-suited for coin-cell or energy-harvesting powered systems. Its self-timed write cycles and I²C acknowledge polling further reduce average system power during configuration updates.

What is the difference between SWP and PSWP commands on the 34AA02T-I/MS?

The SWP (Software Write-Protect) command enables resettable protection of addresses 00h–7Fh and can be cleared later using CSWP; PSWP (Permanent Software Write-Protect) irreversibly locks the same 128-byte region. Once PSWP is executed, no subsequent command, power cycle, or WP pin state change can restore write access to that block.

Which package type does the 34AA02T-I/MS use, and what are its key mechanical features?

The 34AA02T-I/MS uses an 8-lead MSOP package (3.0 mm × 3.0 mm body, 0.65 mm lead pitch) with exposed pad option. It is RoHS-compliant, rated for industrial temperature (–40°C to +85°C), and compatible with standard surface-mount reflow processes - enabling high-density PCB layouts in compact embedded designs.