Microchip Technology AT25080B-TH-B

Overview

AT25080B-TH-B 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, supporting 20 MHz clock rate at 5 V, featuring 32-byte page write and hardware/software write protection via WP pin and status register. It serves as nonvolatile configuration storage in industrial microcontroller systems requiring low-voltage operation and high reliability.

For engineers reviewing the AT25080B-TH-B datasheet, AT25080B-TH-B pinout, AT25080B-TH-B application, or AT25080B-TH-B equivalent, key selection criteria include its 1.8–5.5 V supply range, 5 ms max self-timed write cycle, 1 million write endurance, 100-year data retention, and TSSOP-8 package with NiPdAu lead finish.

Technical Context

The AT25080B-TH-B implements a standard 3-wire SPI slave interface (CS, SCK, SI/SO), supports SPI modes 0 and 3, and uses MSB-first transmission with op-code–driven command protocol. It features a dedicated HOLD pin for pausing ongoing serial transfers without resetting sequence state and a Write Protect (WP) pin that-when enabled via WPEN bit-blocks writes to protected memory blocks and status register.

Internal architecture includes an 8-bit instruction register, nonvolatile status register with BP0/BP1/TPEN bits controlling 1/4, 1/2, or full array block protection, and automatic address increment during page write. All programming cycles are self-timed; no erase step precedes write, and device powers up in write-disabled state requiring WREN instruction before any write operation.

Key Specifications

Pinout & Package

AT25080B-TH-B is packaged in an 8-lead Plastic Thin Shrink Small Outline Package (TSSOP), 4.4 mm body width, JEDEC-compliant footprint (package code 8A2), with NiPdAu lead finish for enhanced solderability and corrosion resistance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT25080B-TH-B, M95080-DRMN6TP/K offers extended temperature range without sacrificing speed or package compatibility, while BR24G08NUX-10 trades SPI flexibility for I²C simplicity and lower pin count-both require validation of timing margins and protection scheme alignment in final design.

Availability

AT25080B-TH-B is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, automotive body control modules, and smart energy meter applications requiring stable component supply across extended product lifecycles.

Supply support for AT25080B-TH-B 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 continues to manufacture and support the AT25080B family as part of its broad serial EEPROM portfolio.

The AT25080B series was designed specifically for low-power, low-voltage embedded systems needing reliable, pin-compatible serial EEPROM with flexible write protection and industrial temperature operation.

FAQ

What is the maximum clock frequency supported by the AT25080B-TH-B at 3.3 V operation?

The AT25080B-TH-B supports up to 10 MHz SCK frequency when VCC = 2.7–5.5 V (per Table 0-4 AC Characteristics). At 3.3 V, this 10 MHz limit applies-lower than the 20 MHz maximum specified only at 4.5–5.5 V. Designers must configure their MCU's SPI peripheral accordingly to avoid setup/hold violations.

Does the AT25080B-TH-B require an external pull-up resistor on the SO pin?

No, the AT25080B-TH-B does not require an external pull-up on the SO pin. Its SO output is actively driven high or low during read operations and enters high-impedance state when CS is high or during HOLD-no open-drain behavior necessitates pull-up. External pull-ups may cause bus contention and are not recommended.

How is block write protection configured on the AT25080B-TH-B?

Block write protection on the AT25080B-TH-B is configured by writing to the status register using the WRSR instruction. Bits BP1 and BP0 determine protection level (none, 1/4, 1/2, or full array), while WPEN enables/disables hardware protection via the WP pin. These bits are nonvolatile and retain settings after power cycle.

Can the AT25080B-TH-B be used with a 1.8 V microcontroller without level shifters?

Yes, the AT25080B-TH-B supports full 1.8 V operation: VCC = 1.8–5.5 V, VIH min = 0.7 × VCC, and VOL2 = 0.2 V at IOL = 0.15 mA. When interfaced with a 1.8 V MCU, all logic thresholds and drive strengths remain compatible-no level shifting is needed for either SI or SO lines.

What happens to the AT25080B-TH-B during a power brownout below 1.8 V?

Below 1.8 V, the AT25080B-TH-B enters undefined operation: the datasheet specifies VCC1 min = 1.8 V. Internal circuitry-including write protection and status register-may become unreliable. To prevent corruption, systems must ensure VCC remains ≥1.8 V during active communication or implement power-fail detection to inhibit writes before brownout occurs.