Microchip Technology 25LC160/P

Overview

25LC160/P from Microchip Technology Inc. is a 16 Kbit (2048 × 8) SPI Serial EEPROM with 2.5–5.5 V supply range, 2 MHz max clock frequency, and industrial temperature rating (−40°C to +85°C). It features 16-byte page write, hardware write protection via WP pin, and HOLD functionality for interrupt-safe serial communication - deployed in embedded control systems for parameter storage and firmware configuration.

For engineers reviewing the 25LC160/P datasheet, 25LC160/P pinout, 25LC160/P application, or 25LC160/P equivalent, key selection considerations include its 2 MHz SPI timing at 2.5 V, 5 ms internal write cycle, block-level write protection (BP0/BP1), and PDIP-8 package compatibility with legacy through-hole designs requiring long-term data retention (>200 years) and 1 million endurance cycles.

Technical Context

The 25LC160/P implements a standard SPI Mode 0,0 interface with separate SI (data-in) and SO (data-out) lines, CS-controlled device selection, and SCK-synchronized edge-triggered latching (SI on rising edge, SO updated after falling edge). Its internal architecture includes an 8-bit instruction register, page latches, and high-voltage generator for EEPROM programming.

Write operations require explicit WREN instruction followed by CS high-to-low transition to initiate self-timed 5 ms erase-and-write cycle; during this time, RDSR allows polling of WIP bit while memory reads are blocked. Block protection is controlled nonvolatilely via BP0/BP1 bits in the Status register, enabling selective locking of upper 1/4, 1/2, or full 2048-byte array.

Key Specifications

Pinout & Package

25LC160/P is housed in an 8-pin Plastic Dual In-line Package (PDIP-8, 300 mil), compliant with JEDEC MS-001, suitable for through-hole prototyping and legacy production assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 25AA160/P and 25LC160T-I/SN, the 25LC160/P provides optimal balance of through-hole serviceability, 2.5 V minimum supply compatibility, and industrial temperature resilience - making it ideal for prototyping, repair, and low-volume industrial control boards where PDIP placement is preferred.

Availability

25LC160/P is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, automotive body control modules, and smart energy meter firmware patch storage requiring stable component supply and long-term obsolescence management.

Supply support for 25LC160/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 microcontrollers, analog devices, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 25LC160/P belongs to Microchip's legacy SPI Serial EEPROM product line, engineered for reliable, low-power nonvolatile data storage in cost-sensitive embedded systems where pin compatibility and long-term data integrity are critical.

FAQ

What is the maximum clock frequency supported by the 25LC160/P?

The 25LC160/P supports up to 2 MHz SPI clock frequency when VCC is 2.5 V or higher. At lower voltages (e.g., 2.5 V), timing parameters such as TCSS, TCSH, and THD are relaxed per the datasheet's AC characteristics table. This 2 MHz limit ensures reliable setup/hold timing for SI sampling and SO output stability in real-world PCB layouts with moderate trace lengths and noise margins.

Does the 25LC160/P require external pull-up resistors on its SPI lines?

Yes - the SO pin is open-drain and requires an external pull-up resistor (typically 4.7 kΩ to VCC) to ensure valid logic-high levels during read operations. SI, SCK, CS, WP, and HOLD are CMOS inputs and may need pull-ups or pull-downs depending on system reset behavior and bus sharing; Microchip recommends pull-ups on CS and WP for default deselection and write protection in unpowered states.

How does the HOLD function operate on the 25LC160/P during an active SPI transaction?

The HOLD pin on the 25LC160/P suspends serial communication mid-sequence when pulled low while SCK is low. During HOLD, SI, SCK, and SO enter high-impedance states and ignore input transitions except CS. To resume, HOLD must be raised while SCK remains low; otherwise, the device waits for the next SCK low-to-high transition. This preserves the internal address pointer and instruction state, enabling deterministic interrupt handling in time-critical MCU firmware.

Can the 25LC160/P be used in a 1.8 V system?

No - the 25LC160/P has a minimum VCC specification of 2.5 V. For 1.8 V operation, Microchip specifies the 25AA160/P variant, which shares identical pinout, instruction set, and package but is characterized down to 1.8 V with reduced max clock (1 MHz). Using 25LC160/P below 2.5 V risks unreliable read/write behavior and violates absolute maximum ratings.

What is the purpose of the WPEN bit in the Status register of the 25LC160/P?

The WPEN (Write-Protect Enable) bit controls whether the WP pin actively enforces hardware write protection. When WPEN = 1 and WP = low, writes to nonvolatile Status register bits (BP0, BP1, WPEN) are disabled - preventing accidental lockout of memory regions. When WPEN = 0, the WP pin is ignored, allowing full Status register writes even with WP grounded. This enables safe field updates before enabling permanent protection.