Microchip Technology 25AA160D-E/P

Overview

25AA160D-E/P from Microchip Technology Inc. is a 16 Kbit (2048 × 8) SPI Serial EEPROM with 32-byte page write capability, 1.8–5.5 V supply range, and automotive-grade temperature support (−40°C to +125°C). It features hardware write protection via WP pin, HOLD functionality for interrupt-safe bus suspension, and block-level software write protection covering 0%, 25%, 50%, or 100% of memory. Used in engine control units, battery management systems, and industrial sensor calibration storage.

For engineers reviewing the 25AA160D-E/P datasheet, 25AA160D-E/P pinout, 25AA160D-E/P application, or 25AA160D-E/P equivalent, key selection criteria include its 32-byte page size (vs. 16-byte 'C' variants), E-temp qualification, PDIP-8 package compatibility, and SPI timing compliance at up to 10 MHz under 4.5–5.5 V operation.

Technical Context

The 25AA160D-E/P implements a standard SPI Mode 0,0 interface with separate SI (data in) and SO (data out) lines, requiring CS, SCK, and optional HOLD/WP control. Its internal architecture includes an 8-bit instruction register, page latches, and high-voltage generation circuitry for EEPROM programming.

Write operations require explicit WREN instruction followed by CS high-to-low transition to initiate self-timed internal write cycles (≤5 ms). The STATUS register provides real-time WIP and WEL status, plus BP0/BP1 bits for nonvolatile block protection configuration - all readable during active writes.

Key Specifications

Pinout & Package

25AA160D-E/P is packaged in an 8-lead PDIP (Plastic Dual In-line Package) with 0.3-inch body width, RoHS-compliant matte tin lead finish, and industry-standard pin spacing (0.1 inch).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 25AA160D-I/P, the 25AA160D-E/P adds automotive temperature qualification and AEC-Q100 alignment, while AT25DF021-SSH-T trades EEPROM reliability and simple SPI protocol for higher density and faster reads - making it unsuitable as a drop-in replacement but viable for greenfield designs prioritizing throughput over write endurance.

Availability

25AA160D-E/P is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor calibration, and medical device parameter storage requiring stable component supply across extended product lifecycles.

Supply support for 25AA160D-E/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 25XX160 family delivers SPI-compatible EEPROMs optimized for automotive, industrial, and medical applications demanding high reliability, long data retention, and robust write protection - designed specifically for integration with PIC® and dsPIC® microcontrollers.

FAQ

What is the maximum clock frequency supported by the 25AA160D-E/P?

The 25AA160D-E/P supports up to 10 MHz SPI clock frequency when VCC is 4.5–5.5 V, 5 MHz at 2.5–4.5 V, and 3 MHz at 1.8–2.5 V. These graded speed limits ensure reliable timing margin across its full operating voltage range, with AC characteristics validated per Table 1-2 in DS22150B. This makes the 25AA160D-E/P suitable for high-throughput firmware updates in automotive ECUs where SPI bandwidth directly impacts boot time.

Does the 25AA160D-E/P support hardware write protection?

Yes, the 25AA160D-E/P supports hardware write protection via Pin 3 (WP) combined with the WPEN bit in its STATUS register. When WP is low and WPEN = 1, writes to nonvolatile STATUS bits are blocked - preventing accidental corruption of block protection settings. This dual-layer mechanism is fully documented in Table 2-4 and Figure 2-7 of the 25AA160D-E/P datasheet, and is critical for securing calibration data in safety-certified systems.

What package type does the 25AA160D-E/P use?

The 25AA160D-E/P uses an 8-lead PDIP (Plastic Dual In-line Package) with 0.3-inch body width and RoHS-compliant matte tin plating. This through-hole package is explicitly listed in the Device Selection Table on page 1 of DS22150B and supports legacy industrial and automotive prototyping workflows requiring manual soldering or socket-based testing. Its pinout matches industry-standard SPI EEPROM footprints.

How many write/erase cycles can the 25AA160D-E/P endure?

The 25AA160D-E/P guarantees >1 million erase/write cycles at 25°C and VCC = 5.5 V, as specified in Parameter No. 21 of Table 1-3 in DS22150B. This endurance rating is ensured by characterization (not 100% tested) and supports daily reconfiguration over a decade in industrial controllers. Real-world wear leveling is unnecessary due to the device's inherent uniform cell stress distribution.

What is the purpose of the HOLD pin on the 25AA160D-E/P?

The HOLD pin (Pin 7) on the 25AA160D-E/P suspends ongoing SPI communication without resetting the transaction state - allowing the host MCU to service higher-priority interrupts and resume exactly where it left off. Per Section 3.6 and Figure 1-1 of DS22150B, HOLD must be asserted during SCK low time and released under the same condition to avoid bus glitches. This feature is essential for deterministic timing in real-time automotive software stacks.