Microchip Technology AT25010B-SSHL-B

Overview

AT25010B-SSHL-B from Microchip Technology is a 1 Kbit (128 × 8) SPI Serial EEPROM with industrial-grade operation (−40°C to +85°C), 1.8V–5.5V supply range, and 20 MHz max clock rate at 5V. It features hardware write protection via WP pin, HOLD suspend functionality, and 8-byte page write mode - deployed in embedded microcontroller systems for firmware parameter storage and calibration data retention.

For engineers reviewing the AT25010B-SSHL-B datasheet, AT25010B-SSHL-B pinout, AT25010B-SSHL-B application, or AT25010B-SSHL-B equivalent, key selection considerations include SPI Mode 0/3 compatibility, 5 ms max self-timed write cycle, block-level write protection (1/4, 1/2, or full array), ESD >4 kV, and green SOIC-8 packaging with lead-free/RoHS compliance.

Technical Context

The AT25010B-SSHL-B operates as an SPI slave device with fixed 8-bit instruction register and MSb-first data framing. Its internal architecture includes a STATUS register with nonvolatile BP1/BP0 bits for block protection, WEL latch for write enable control, and RDY/BSY flag indicating active write cycles.

It supports dual SPI modes: Mode 0 (SCK idle low) and Mode 3 (SCK idle high), with data latched on SCK rising edge and output on falling edge. The HOLD pin suspends serial communication without resetting the sequence, while the WP pin disables all write operations when driven low - both functional independently of CS state during active transfers.

Key Specifications

Pinout & Package

AT25010B-SSHL-B is housed in an 8-lead SOIC package (3.9 mm × 4.9 mm, 1.27 mm pitch), marked per Microchip's standard top-side laser marking convention and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M95010-WMN6TP and BR24G01NUX-5TR, the AT25010B-SSHL-B provides balanced industrial timing specs, proven HOLD functionality for real-time systems, and seamless integration into existing Microchip MCU ecosystems - making it optimal for cost-sensitive, thermally stable embedded designs requiring deterministic write behavior.

Availability

AT25010B-SSHL-B is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, automotive body control modules, and smart energy metering requiring stable component supply across multi-year production cycles.

Supply support for AT25010B-SSHL-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 Inc. is a U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and memory solutions, with ISO 9001-certified global manufacturing and design centers.

The AT25010B-SSHL-B belongs to Microchip's AT25xxx family of SPI Serial EEPROMs, engineered specifically for reliable, low-power nonvolatile storage in space-constrained industrial and commercial systems where pin efficiency and voltage flexibility are critical.

FAQ

What is the maximum clock frequency supported by the AT25010B-SSHL-B at 3.3V operation?

The AT25010B-SSHL-B supports up to 10 MHz SCK frequency when operated at VCC = 2.5V to 5.5V, which includes 3.3V nominal supply. This is specified in Table 4-3 of the DS20006251A datasheet. At 3.3V, timing parameters such as tWH (SCK high time) and tWL (SCK low time) are guaranteed ≥40 ns, enabling robust communication with common 3.3V microcontrollers without custom timing adjustments. The AT25010B-SSHL-B maintains full functionality across this range without derating.

Does the AT25010B-SSHL-B require external pull-up resistors on its SPI lines?

Yes - the AT25010B-SSHL-B requires a pull-up resistor (≤10 kΩ) on the CS pin to ensure proper power-up behavior and prevent spurious writes, as specified in Section 2.1 of the datasheet. SO is internally tri-stated and does not require pull-up; SI, SCK, WP, and HOLD are CMOS inputs and may need pull-ups depending on host controller drive strength and PCB routing, though not mandated by the AT25010B-SSHL-B itself. Always verify signal integrity with scope measurements in final layout.

How does the HOLD pin behave during an active write cycle in the AT25010B-SSHL-B?

The HOLD pin has no effect on an active internal write cycle in the AT25010B-SSHL-B. As stated in Section 5.3, "the Hold mode does not have an effect on the internal write cycle" - meaning if a WRITE or WRSR command has already triggered the 5 ms self-timed erase-and-program sequence, asserting HOLD will pause only further SPI communication but will not halt or delay the ongoing write. The AT25010B-SSHL-B completes the write autonomously and asserts RDY/BSY=0 upon completion, regardless of HOLD state.

Can the AT25010B-SSHL-B be used with SPI Mode 1 or Mode 2 interfaces?

No - the AT25010B-SSHL-B explicitly supports only SPI Modes 0 and 3, as confirmed in the Features section and Section 5.1. It samples SI on the rising edge of SCK and outputs SO on the falling edge, requiring matching SCK polarity (idle low for Mode 0, idle high for Mode 3). SPI Modes 1 and 2 use opposite edge relationships and are incompatible. Attempting to use Mode 1 or 2 will result in corrupted reads/writes. The AT25010B-SSHL-B must be configured in Mode 0 or Mode 3 in the host controller's SPI peripheral.

What is the factory default state of the STATUS register in the AT25010B-SSHL-B?

Per Section 4.6.6 and Table 6-3, the AT25010B-SSHL-B ships with the STATUS register's BP1 and BP0 bits set to 00 (no array write protection), WEL = 0 (write disabled), and RDY/BSY = 0 (ready). The reserved bits (7:4) read as 0. This default allows immediate read access and requires explicit WREN instruction before any write operation - ensuring safe out-of-box behavior. All memory locations contain FFh (logic '1') at shipment, and the AT25010B-SSHL-B retains these defaults until modified by firmware.