Microchip Technology AT25080B-PU

Overview

AT25080B-PU from Microchip Technology (formerly Atmel) is an 8-Kbit SPI serial EEPROM organized as 1024 × 8-bit memory, operating from 1.8 V to 5.5 V with 20 MHz max clock rate at 5 V, 32-byte page write capability, and hardware/software write protection. It serves as nonvolatile configuration storage in microcontroller-based industrial control modules requiring low-voltage operation and long data retention.

For engineers reviewing the AT25080B-PU datasheet, AT25080B-PU pinout, AT25080B-PU application, or AT25080B-PU equivalent, key selection criteria include SPI Mode 0/3 compatibility, 1 million write endurance, 100-year data retention, block write protection granularity (1/4, 1/2, or full array), and PDIP-8 package suitability for through-hole prototyping and legacy industrial PCBs.

Technical Context

The AT25080B-PU implements a synchronous slave SPI interface with dedicated SI/SO pins, CS-controlled selection, and HOLD pin for pausing ongoing transfers without resetting sequence state. Its status register includes nonvolatile BP0/BP1 bits for configurable block protection and WPEN bit enabling/disabling hardware write protect via the WP pin.

Internal self-timed write cycles complete in ≤5 ms with no external erase step required; all programming instructions (WREN, WRITE, WRSR) require prior write-enable latch activation, and only RDSR remains functional during active writes. The device supports standard SPI timing with tWH/tWL ≥20 ns at 5 V, and operates across –40°C to +85°C industrial temperature range.

Key Specifications

Pinout & Package

AT25080B-PU uses an 8-lead JEDEC PDIP (package code 8P3) with 0.300" body width, suitable for through-hole mounting and manual soldering in development and low-volume production.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M95080-DW and BR24G08FJ-WE2, the AT25080B-PU uniquely combines 1.8 V operation, PDIP-8 packaging, and SPI Mode 0/3 flexibility - making it optimal for industrial prototyping, legacy 5 V systems, and mixed-voltage embedded designs where pin-compatible drop-in replacement is not required but voltage and interface alignment are critical.

Availability

AT25080B-PU is available at Aetrix Electronics and suitable for industrial control systems, medical instrumentation, smart energy meters, and automotive body electronics requiring stable component supply and long-term obsolescence management.

Supply support for AT25080B-PU 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 acquired Atmel in 2016 and maintains full product support, documentation, and manufacturing continuity for the AT25xxx EEPROM family.

The AT25080B-PU belongs to Microchip's serial EEPROM product line, designed specifically for reliable, low-power nonvolatile storage in industrial, medical, and automotive applications where SPI interface simplicity and robust data retention are essential.

FAQ

What is the maximum clock frequency supported by the AT25080B-PU?

The AT25080B-PU supports up to 20 MHz SCK frequency at VCC = 5.0 V, 10 MHz at 2.7–5.5 V, and 5 MHz at 1.8–5.5 V. These values are specified in Table 0-4 of the datasheet and reflect guaranteed AC timing margins across voltage and temperature ranges. The AT25080B-PU must be operated within these limits to ensure reliable read/write operations and avoid setup/hold violations.

Does the AT25080B-PU require an external erase command before writing?

No, the AT25080B-PU does not require a separate erase command. All write operations are self-timed and automatically erase and program the target memory location in a single internal cycle lasting ≤5 ms. This eliminates firmware complexity associated with managing erase/write sequencing and allows immediate follow-up reads after the write cycle completes, as confirmed by monitoring the RDY bit in the status register.

How is write protection configured on the AT25080B-PU?

Write protection on the AT25080B-PU is configured using two mechanisms: software control via the WRSR instruction to set BP0/BP1 bits (selecting 0%, 25%, 50%, or 100% array protection), and hardware control via the WP pin when the WPEN bit is set to "1". Both methods can be used independently or together - for example, WP can guard against accidental writes during field service while BP bits protect firmware regions during normal operation. The AT25080B-PU status register reflects current protection state in real time.

What package type does the AT25080B-PU use, and is it RoHS compliant?

The AT25080B-PU uses an 8-lead JEDEC PDIP (plastic dual in-line package) with 0.300" body width, designated as package code 8P3. Per the ordering information table, it is explicitly marked "Lead-free/Halogen-free" and qualified for industrial temperature range (–40°C to +85°C). This makes the AT25080B-PU fully RoHS 2011/65/EU and REACH compliant, with NiPdAu lead finish as standard.

Can the AT25080B-PU operate with a 1.8 V microcontroller without level shifters?

Yes, the AT25080B-PU supports true 1.8 V operation across its full specification - including logic thresholds (VIH = 0.7×VCC, VIL = 0.3×VCC), AC timing, and DC characteristics - allowing direct connection to 1.8 V SPI peripherals without level translation. This is verified in Tables 0-3 and 0-4 of the datasheet, where parameters are characterized down to VCC = 1.8 V. The AT25080B-PU maintains full functionality and timing compliance at this voltage.