Microchip Technology 25AA160-I/P

Overview

25AA160-I/P from Microchip Technology Inc. is an industrial-grade 16 Kbit SPI Serial EEPROM with 2048 × 8-bit organization, 1.8–5.5 V supply range, and 1 MHz max clock frequency. It features hardware write protection (WP pin), HOLD functionality for interrupt-safe serial pauses, and 16-byte page write capability. It is used in embedded systems requiring nonvolatile parameter storage across temperature-critical environments such as industrial control panels and sensor calibration modules.

For engineers reviewing the 25AA160-I/P datasheet, 25AA160-I/P pinout, 25AA160-I/P application, or 25AA160-I/P equivalent, key selection criteria include its 1.8 V minimum operating voltage, industrial −40°C to +85°C temperature rating, PDIP-8 package, SPI interface timing compliance, and block-level write protection granularity (none/¼/½/all array).

Technical Context

The 25AA160-I/P implements a standard SPI Mode 0,0 (CPOL=0, CPHA=0) interface with separate SI and SO lines, supporting sequential read and page write operations. Its internal architecture includes a status register with WIP, WEL, BP0/BP1, and WPEN bits, enabling programmable block protection and hardware write-disable control via the WP pin when WPEN is set.

It uses self-timed internal erase/write cycles (max 5 ms), requires explicit WREN instruction before writes, and supports HOLD input to suspend ongoing SPI transfers without resetting the sequence - critical for real-time host interrupt handling. The device powers up with WEL reset and SO in high-impedance state.

Key Specifications

Pinout & Package

25AA160-I/P is supplied in an 8-pin Plastic Dual In-line Package (PDIP), 300 mil body width, JEDEC MS-001 compliant, with through-hole mounting and 2.54 mm pitch. Pin 1 is marked by notch or dot; leads are tin-lead plated per standard Microchip specification.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 25AA160T-I/P and 25LC160-I/P, the 25AA160-I/P uniquely supports 1.8 V operation and is optimized for cost-sensitive, low-power industrial designs where tape-and-reel handling or higher-speed clocks are unnecessary.

Availability

25AA160-I/P is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded controller configuration, and medical device settings storage requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for 25AA160-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 leading provider of microcontroller, analog, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 25AA160-I/P belongs to Microchip's legacy SPI Serial EEPROM product line, designed specifically for reliable, low-voltage nonvolatile storage in industrial and automotive-adjacent embedded systems where robustness and wide VCC tolerance are critical.

FAQ

What is the minimum supply voltage required for reliable operation of the 25AA160-I/P?

The 25AA160-I/P operates reliably down to 1.8 V, making it compatible with modern low-power microcontrollers and battery-powered systems. Below this threshold, read/write functionality is not guaranteed, and the device may fail to respond to SPI commands or corrupt data. Always verify VCC stability under load using a 0.1 µF ceramic bypass capacitor placed near the VCC pin of the 25AA160-I/P.

How does the HOLD pin function during an active SPI transaction with the 25AA160-I/P?

The HOLD pin on the 25AA160-I/P suspends ongoing SPI communication without resetting the internal state - for example, mid-read or mid-page-write. When pulled low during SCK low time, SI/SO/SCK enter high-impedance and are ignored until HOLD returns high (also during SCK low). This preserves the exact byte position and address pointer, enabling deterministic resumption. The 25AA160-I/P remains selected throughout.

Can the 25AA160-I/P be used in a 5 V system without level shifting?

Yes, the 25AA160-I/P supports VCC up to 5.5 V and has TTL-compatible input thresholds (VIH1 ≥ 2.0 V, VIL1 ≤ 0.8 V at VCC ≥ 2.7 V), allowing direct connection to 5 V microcontrollers. Its outputs drive to VCC – 0.5 V (VOH) and 0.4 V (VOL), meeting 5 V logic high/low requirements. No level shifter is needed when VCC = 5 V and host I/O is 5 V tolerant.

What happens if a page write crosses the 16-byte boundary on the 25AA160-I/P?

If a page write exceeds the 16-byte boundary on the 25AA160-I/P, the internal address counter rolls over to the start of the same page, overwriting previously written bytes in that page. For example, writing 18 bytes starting at address 0x000F wraps to 0x0000 after byte 16, overwriting bytes 0–1. To avoid corruption, software must enforce page alignment and limit burst writes to ≤16 bytes within one page (e.g., addresses 0x0000–0x000F).

Is the 25AA160-I/P pin-compatible with the 25LC160-I/P?

Yes, the 25AA160-I/P and 25LC160-I/P share identical PDIP-8 packaging, pinout, and SPI instruction set. However, they differ electrically: 25AA160-I/P operates from 1.8–5.5 V with 1 MHz max clock, while 25LC160-I/P requires 2.5–5.5 V and supports 2 MHz. Substitution is possible only if system VCC ≥ 2.5 V and timing margins allow - verify AC characteristics per DS21231E before interchanging.