Microchip Technology 93C46A-E/MS

Overview

93C46A-E/MS from Microchip Technology Inc. is a 1Kbit (128 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 4.5–5.5 V supply range, and industrial/automotive temperature support (−40°C to +125°C). It features self-timed erase/write cycles, automatic ERAL before WRAL, power-on/off data protection, and Ready/Busy status signaling via DO pin - used for configuration storage in microcontroller-based automotive control modules.

For engineers reviewing the 93C46A-E/MS datasheet, 93C46A-E/MS pinout, 93C46A-E/MS application, or 93C46A-E/MS equivalent, key selection considerations include its fixed 8-bit organization (no ORG pin), MSOP-8 package footprint, 2 ms program cycle time, RoHS-compliant Pb-free Matte Tin finish, and compatibility with legacy Microwire host controllers requiring deterministic timing and nonvolatile parameter retention.

Technical Context

The 93C46A-E/MS implements a synchronous serial interface using CS, CLK, and DI/DO pins with start-bit detection and opcode-driven command execution. Its internal architecture includes an address decoder, data register, mode decode logic, and output buffer, supporting READ, WRITE, ERASE, ERAL, WRAL, EWEN, and EWDS instructions - all clocked on CLK rising edges.

Unlike C-variant devices, the 'A' version lacks an ORG pin and is hardwired for 8-bit operation; it requires VCC ≥4.5 V for ERAL and WRAL functions and enters EWDS state at power-up, mandating explicit EWEN before any write/erase. Timing is governed by TCSL (250 ns min), TPD (≤400 ns), and TWC (2 ms), with DO providing active-low Ready/Busy status during programming when CS is reasserted post-TCSL.

Key Specifications

Pinout & Package

93C46A-E/MS is housed in an 8-lead MSOP (Mini Small Outline Package) with 0.65 mm pitch, 3.0 × 3.0 mm body, and exposed pad option (not connected per datasheet). Pin 1 is marked by laser dot; package is Pb-free (Matte Tin) and RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 93LC46A-E/MS, the 93C46A-E/MS offers tighter V_CC tolerance and guaranteed 5 V operation but sacrifices 3.3 V flexibility; versus AT25010B-MAHL-T, it provides deterministic hardware status signaling and Microwire compatibility at the cost of interface standardization.

Availability

93C46A-E/MS is available at Aetrix Electronics and suitable for automotive control units, infotainment systems, and ADAS calibration storage requiring stable component supply across extended product lifecycles.

Supply support for 93C46A-E/MS 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 components, and memory solutions, headquartered in Chandler, Arizona.

The 93Cxx family was designed specifically for cost-sensitive, space-constrained embedded systems needing reliable, low-power serial EEPROM with Microwire compatibility and automotive-grade reliability.

FAQ

What is the memory organization and capacity of the 93C46A-E/MS?

The 93C46A-E/MS is a 1 Kbit serial EEPROM organized as 128 words × 8 bits. It has no ORG pin and is fixed to 8-bit operation - unlike C-variant parts, it does not support 16-bit mode. This simplifies interface design in 8-bit microcontroller systems and eliminates external configuration logic. The 93C46A-E/MS delivers deterministic addressing and data framing without mode negotiation overhead.

Does the 93C46A-E/MS require an external ORG pin connection?

No, the 93C46A-E/MS does not have an ORG pin - it is internally configured for 8-bit operation only. Pins 6 and 8 are marked NC (No Connect) in the MSOP-8 package. This eliminates routing complexity and potential misconfiguration risks present in ORG-enabled variants like the 93C46C-E/MS. The 93C46A-E/MS is fully compatible with legacy Microwire hosts expecting fixed x8 data width.

What is the minimum V_CC required for write operations on the 93C46A-E/MS?

The 93C46A-E/MS requires V_CC ≥ 4.5 V for all write, erase, ERAL, and WRAL operations. Its power-on reset threshold (V_POR) is 3.8 V - below this, all commands are inhibited and the device remains in a safe, read-only state. This ensures data integrity during brown-out conditions common in automotive electrical systems, where voltage sags below 4.5 V would otherwise risk partial writes.

How is Ready/Busy status signaled on the 93C46A-E/MS?

The 93C46A-E/MS signals Ready/Busy status on the DO pin: DO = low indicates ongoing erase/write, DO = high means operation complete. To read status, CS must be brought high for ≥250 ns after TCSL, then sampled on CLK rising edges. Unlike status register-based EEPROMs, this hardware-level signaling avoids extra command overhead and guarantees deterministic timing - critical for real-time automotive firmware.

Is the 93C46A-E/MS qualified for automotive applications?

Yes, the 93C46A-E/MS carries the "E" suffix denoting Automotive grade qualification, rated for −40°C to +125°C operation and compliant with AEC-Q100 stress testing requirements. It is packaged in MSOP-8 with Pb-free Matte Tin finish and supports full data retention (>200 years) and endurance (1 million cycles) under automotive thermal and voltage stress profiles - making it suitable for engine control, transmission, and ADAS modules.