Microchip Technology AT93C86A-10SU-1.8

Overview

AT93C86A-10SU-1.8 from Microchip Technology is a 16-Kbit three-wire serial EEPROM with user-selectable x8/x16 organization, 1.8V to 5.5V operation, industrial temperature range (−40°C to +85°C), and self-timed write cycle ≤10 ms. It serves as nonvolatile configuration storage in embedded controllers, power management units, and sensor calibration modules.

For engineers reviewing the AT93C86A-10SU-1.8 datasheet, AT93C86A-10SU-1.8 pinout, AT93C86A-10SU-1.8 application, or AT93C86A-10SU-1.8 equivalent, key selection criteria include low-voltage compatibility (1.8V min), Schmitt-trigger noise immunity, 1 M write-cycle endurance, 100-year data retention, and SOIC-8 package footprint compatibility with legacy designs.

Technical Context

The AT93C86A-10SU-1.8 implements a synchronous three-wire interface (CS/SK/DI/DO) with ORG pin-controlled memory mapping (2,048 × 8 or 1,024 × 16), enabling flexible byte- or word-oriented access. Its internal architecture includes a high-voltage generation circuit for EEPROM programming and a power-on reset (POR) circuit ensuring command inhibition until VCC stabilizes ≥1.5 V.

Timing is fully synchronous to SK rising edges: data latched on DI and output on DO at each SK edge, with tSKH/tSKL ≥1000 ns at 1.8V and ≥250 ns at 5V. Ready/Busy status is returned via DO when CS is asserted after write/erase initiation, eliminating need for external polling delays.

Key Specifications

Pinout & Package

AT93C86A-10SU-1.8 is packaged in an 8-lead SOIC (Small Outline Integrated Circuit) with 150-mil body width, compatible with standard surface-mount assembly processes and IPC-7351 land patterns.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M95128-DRMN6TP/K and 25AA160C-I/SN, the AT93C86A-10SU-1.8 uniquely supports both x8 and x16 configurations via ORG pin, retains Microwire protocol compatibility for legacy microcontroller drivers, and offers identical 1.8V–5.5V operation and industrial temperature range in the same SOIC-8 footprint.

Availability

AT93C86A-10SU-1.8 is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control modules, medical sensor calibration, smart energy meters, and IoT edge node configuration storage requiring stable component supply and long-term obsolescence support.

Supply support for AT93C86A-10SU-1.8 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 is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and memory products, with ISO 9001-certified manufacturing and global distribution.

The AT93C86A-10SU-1.8 belongs to Microchip's legacy Atmel serial EEPROM product line, designed specifically for low-voltage, high-reliability nonvolatile storage in space-constrained industrial and automotive systems where pin count and power efficiency are critical.

FAQ

What is the function of the ORG pin on the AT93C86A-10SU-1.8?

The ORG pin on the AT93C86A-10SU-1.8 selects the internal memory organization: tied to VCC for 1,024 × 16-bit mode, tied to GND for 2,048 × 8-bit mode. If left unconnected, the internal 10 MΩ pull-up defaults to x16 mode. This hardware-selectable configuration eliminates firmware changes when adapting the AT93C86A-10SU-1.8 to different host processor data bus widths.

Does the AT93C86A-10SU-1.8 require an external write-enable command before every write operation?

Yes - the AT93C86A-10SU-1.8 requires an Erase/Write Enable (EWEN) instruction before any WRITE, ERASE, WRAL, or ERAL command. After power-up, the device defaults to Erase/Write Disable (EWDS) state for data protection. The EWEN command must be issued once per power cycle; subsequent writes remain enabled until EWDS is sent or power is cycled. This safety mechanism prevents accidental overwrites in the AT93C86A-10SU-1.8.

What is the maximum clock frequency supported by the AT93C86A-10SU-1.8 at 1.8V?

The AT93C86A-10SU-1.8 supports a maximum clock frequency of 250 kHz when operated at 1.8V, as specified in its AC characteristics table. This limit ensures reliable timing margins given slower internal propagation delays at low voltage. At 5.0V, the maximum clock rate increases to 2 MHz. All timing parameters - including tSKH, tSKL, and tCS - scale accordingly, and the AT93C86A-10SU-1.8 must be configured to match the host's clock capability at its operating VCC.

How does the AT93C86A-10SU-1.8 indicate readiness after a write operation?

The AT93C86A-10SU-1.8 outputs Ready/Busy status on the DO pin: when CS is brought high after initiating a write (or erase), DO asserts logic '0' during the self-timed write cycle (≤10 ms) and transitions to logic '1' upon completion. This status is valid only if CS remains low for ≥tCS (1000 ns at 1.8V) before going high. Host software must monitor DO rather than use fixed delays - a key timing behavior unique to the AT93C86A-10SU-1.8.

Is the AT93C86A-10SU-1.8 compatible with standard SOIC-8 footprints?

Yes - the AT93C86A-10SU-1.8 uses an industry-standard 8-lead SOIC package with 150-mil body width, 1.27 mm pitch, and 3.90 mm × 4.90 mm outline. Its land pattern matches IPC-7351 SOIC_N_8 footprint (e.g., Microchip drawing C04-057-SN). Pin 1 is marked by a notch or dot; the NC pin (pin 7) must remain unconnected. This mechanical compatibility ensures drop-in replacement in existing AT93C86A-10SU-1.8 designs.