Microchip Technology 47C16T-E/SN

Overview

47C16T-E/SN from Microchip Technology is a 16 Kbit (2,048 × 8) I²C serial EERAM combining volatile SRAM with nonvolatile EEPROM backup. It features automatic power-loss store/recall via external VCAP capacitor, hardware Store pin (HS), and software-controlled Store/Recall commands. With 1 MHz I²C interface, 25 ms max Store time, and AEC-Q100-qualified operation from –40°C to +125°C, it serves as a robust data-retention memory in automotive engine control units.

For engineers reviewing the 47C16T-E/SN datasheet, 47C16T-E/SN pinout, 47C16T-E/SN application, or 47C16T-E/SN equivalent, key selection criteria include VCC range (4.5–5.5 V), industrial/extended temperature support, SRAM-to-EEPROM store endurance (>1 million cycles), and I²C timing compliance at 1 MHz - all critical for fail-safe data logging in safety-critical embedded systems.

Technical Context

The 47C16T-E/SN implements a dual-memory architecture where SRAM provides high-speed read/write access while EEPROM preserves data across power cycles. Its I²C client logic supports standard 7-bit addressing with user-configurable A1/A2 pins and op-code-based register/SRAM access separation.

Store and Recall operations are managed through three independent triggers: automatic (on VCC fall below VTRIP ≈ 4.0–4.4 V), hardware (via HS pin pulse ≥150 ns), or software (via COMMAND register writes 0x33 or 0xDD). The STATUS register (address 0x00) tracks array modification (AM bit), enables Auto-Store (ASE), configures write protection (BP2–BP0), and latches external events (EVENT bit).

Key Specifications

Pinout & Package

47C16T-E/SN is housed in an 8-lead SOIC package (SN suffix), with gull-wing leads, 1.27 mm pitch, and JEDEC MS-012AC outline. Pin 1 is marked by a beveled corner or dot; device orientation follows standard SOIC conventions.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 47C16T-E/SN, the 47L16T-E/SN offers identical functionality at 3.3 V, while the FM24V10-G replaces EEPROM-based store with F-RAM's instant write capability - trading automotive qualification and hardware trigger support for infinite endurance and sub-microsecond write latency.

Availability

47C16T-E/SN is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controllers, and medical diagnostic devices requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 47C16T-E/SN 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, with global design and manufacturing operations.

The 47C16T-E/SN belongs to Microchip's EERAM product line - engineered specifically for applications demanding seamless, low-overhead nonvolatile data retention in I²C-connected embedded systems.

FAQ

What is the primary function of the VCAP pin on the 47C16T-E/SN?

The VCAP pin on the 47C16T-E/SN connects to an external 5–6.8 µF capacitor that supplies energy during power loss, enabling automatic SRAM-to-EEPROM store when VCC falls below the trip voltage (4.0–4.4 V). Without VCAP, Auto-Store must be disabled (ASE = 0) and manual Store via HS pin or software command used instead. This pin is essential for achieving hands-free data preservation in automotive and industrial power-fail scenarios.

How does the 47C16T-E/SN differ from standard I²C EEPROMs?

Unlike standard I²C EEPROMs, the 47C16T-E/SN integrates a parallel-access SRAM array with EEPROM backup - enabling zero-cycle-delay reads/writes to SRAM while preserving data in EEPROM. It adds hardware Store (HS pin), automatic power-loss detection, and software-configurable write protection. These features eliminate EEPROM write latency bottlenecks and simplify firmware design for real-time data logging applications.

Can the 47C16T-E/SN be used in a 3.3 V system?

No - the 47C16T-E/SN is specified for 4.5–5.5 V operation only. For 3.3 V systems, Microchip recommends the pin-compatible 47L16T-E/SN variant, which operates from 2.7–3.6 V and shares identical density, timing, and feature set. Using 47C16T-E/SN below 4.5 V violates absolute maximum ratings and risks unreliable Auto-Store activation due to incorrect VTRIP threshold behavior.

What is the purpose of the EVENT bit in the STATUS register of the 47C16T-E/SN?

The EVENT bit (bit 0) in the STATUS register of the 47C16T-E/SN latches detection of a high-level pulse on the HS pin, indicating an external hardware event such as a crash trigger or emergency save request. It remains set until cleared by software, enabling post-event diagnostics without continuous polling. The bit is nonvolatile and survives power cycles, making it valuable for forensic data capture in automotive and industrial safety systems.

Is the 47C16T-E/SN AEC-Q100 qualified, and what grade does it meet?

Yes - the 47C16T-E/SN is AEC-Q100 qualified for Extended Temperature Range (–40°C to +125°C), designated by the "E" suffix in its part number. This qualification covers stress testing for automotive under-hood environments, including thermal cycling, humidity, and vibration. The device meets AEC-Q100 Grade 1 requirements, supporting deployment in engine control, transmission, and ADAS modules where reliability under extreme conditions is mandatory.