Microchip Technology AT24C11-10PU-1.8

Overview

AT24C11-10PU-1.8 from Microchip Technology (formerly Atmel) is a 1 Kbit (128 × 8) serial EEPROM IC optimized for low-voltage embedded systems, featuring 1.8V to 5.5V operation, 4-byte page write capability, 400 kHz I²C interface at 1.8V, and automotive-grade industrial temperature range (–40°C to +85°C). It serves as nonvolatile configuration storage in power-constrained sensor nodes and microcontroller peripherals.

For engineers reviewing the AT24C11-10PU-1.8 datasheet, AT24C11-10PU-1.8 pinout, AT24C11-10PU-1.8 application, or AT24C11-10PU-1.8 equivalent, key selection considerations include its 1.8V minimum supply, PDIP-8 Green package with RoHS/halogen-free compliance, 1 million write cycles endurance, and strict timing requirements for I²C acknowledge polling during write cycles.

Technical Context

The AT24C11-10PU-1.8 implements a two-wire (I²C-compatible) serial interface with open-drain SDA and edge-triggered SCL pins, supporting byte and 4-byte page writes with self-timed internal write cycles up to 5 ms. Its memory is organized into 32 pages of 4 bytes each, with address auto-increment within pages and rollover behavior on boundary overflow.

It operates across –40°C to +85°C with standby current as low as 0.6 µA at 1.8V, uses no external address pins (fixed 7-bit device address), and relies on external pull-ups for bus signaling. The TEST pin must be tied to GND or VCC; NC pins are unconnected and electrically isolated.

Key Specifications

Pinout & Package

AT24C11-10PU-1.8 is supplied in an 8-lead PDIP (Plastic Dual Inline Package), 0.300" wide body, lead-free and halogen-free (Green package "U" suffix), compliant with JEDEC MS-001 BA.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C11-10PU-1.8, AT24C01C-SSHM-T offers faster communication but requires board-level redesign due to pinout mismatch, while M95010-WMN6TP replaces I²C with SPI - demanding firmware and driver changes rather than drop-in substitution.

Availability

AT24C11-10PU-1.8 is available at Aetrix Electronics and suitable for industrial PLCs, medical infusion pumps, smart sensor nodes, and consumer IoT hubs requiring stable component supply with full RoHS/halogen-free compliance and automotive-grade temperature support.

Supply support for AT24C11-10PU-1.8 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 nonvolatile memory solutions, with broad industrial and automotive qualification programs.

The AT24C11 series belongs to Microchip's legacy serial EEPROM product line, designed specifically for cost-sensitive, low-power embedded systems needing reliable, pin-efficient nonvolatile storage in space-constrained layouts.

FAQ

What is the minimum operating voltage for AT24C11-10PU-1.8?

The AT24C11-10PU-1.8 operates down to 1.8V, as confirmed by its "–1.8" suffix and datasheet Section "Features" specifying 1.8V (VCC = 1.8V to 5.5V) operation. This enables direct integration with 1.8V logic families without level-shifting circuitry. Below 1.8V, the device will not function reliably - no guaranteed operation exists at 1.7V or lower. Always maintain VCC ≥ 1.8V during active read/write cycles and standby modes for AT24C11-10PU-1.8.

Does AT24C11-10PU-1.8 require external pull-up resistors on SDA and SCL lines?

Yes, AT24C11-10PU-1.8 requires external pull-up resistors on both SDA and SCL pins because its SDA is open-drain and SCL is a CMOS input. Typical values are 4.7 kΩ for standard-mode (100 kHz) and 2.2 kΩ for fast-mode (400 kHz) I²C buses at 1.8V. Pull-up voltage must match VCC (1.8V–5.5V); mismatched voltages risk bus contention or signal integrity failure. No internal pull-ups exist - omission will prevent AT24C11-10PU-1.8 from communicating on the I²C bus.

Can AT24C11-10PU-1.8 be used in place of AT24C11-10PI-2.7 on the same PCB?

No - AT24C11-10PU-1.8 and AT24C11-10PI-2.7 share identical pinout and memory organization but differ in voltage range and packaging: "U" denotes lead-free/halogen-free PDIP, while "I" indicates standard PDIP. More critically, AT24C11-10PI-2.7 is rated for 2.7V–5.5V only and will not operate below 2.7V. Substituting AT24C11-10PU-1.8 into a 2.7V-only design is safe; substituting the reverse risks functional failure below 2.7V. Always verify VCC compliance before interchange.

What is the purpose of the TEST pin on AT24C11-10PU-1.8?

The TEST pin on AT24C11-10PU-1.8 must be permanently tied to either GND or VCC - it is not an optional or floating signal. Datasheet Pin Description states this pin is used during factory testing and affects internal biasing; leaving it unconnected violates Absolute Maximum Ratings and may cause erratic behavior or permanent damage. For AT24C11-10PU-1.8, tie TEST to GND unless application-specific validation confirms VCC tie is required. Never leave TEST floating.

How many write cycles can AT24C11-10PU-1.8 endure before failure?

AT24C11-10PU-1.8 guarantees 1 million write cycles per memory location, as specified in the "Features" section and Table 4 (Endurance). This rating applies under recommended conditions: VCC = 5.0V, TA = 25°C, page-mode writes. Endurance decreases at elevated temperatures or reduced VCC; however, even at 85°C and 1.8V, the device maintains usable lifetime for most embedded applications. After 1M cycles, data retention or write verification may degrade - system-level wear leveling is not implemented in AT24C11-10PU-1.8.