Microchip Technology 47C16T-I/SN

Overview

47C16T-I/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 VCAP capacitor, hardware Store pin (HS), and software-controlled Store/Recall commands. With 1 MHz I²C interface, 25 ms max Store time, and industrial temperature range (–40°C to +85°C), it serves as a robust memory solution in programmable logic controllers and industrial sensor nodes.

For engineers reviewing the 47C16T-I/SN datasheet, 47C16T-I/SN pinout, 47C16T-I/SN application, or 47C16T-I/SN equivalent, this page delivers verified electrical specs, validated pin functions, real-world use cases for fail-safe data retention, and two confirmed alternative parts with documented functional and application-level differences.

Technical Context

The 47C16T-I/SN implements a dual-memory architecture: a 2,048 × 8-bit SRAM array for high-speed read/write access and an integrated EEPROM array for nonvolatile backup. Its I²C interface supports standard (100 kHz), fast (400 kHz), and high-speed (1 MHz) modes with Schmitt-trigger inputs and zero-cycle-delay transfers.

Power-loss handling is managed through three independent mechanisms: Auto-Store (triggered when VCC falls below VTRIP = 4.0–4.4 V), Hardware Store (via HS pin pulse ≥150 ns), and Software Store (via COMMAND register write of 0x33). Recall occurs automatically on power-up or via software command (0xDD), with status tracked by the volatile AM bit and nonvolatile ASE/Event flags.

Key Specifications

Pinout & Package

47C16T-I/SN is housed in an 8-lead SOIC package (SN suffix), with gull-wing leads, 1.27 mm pitch, and JEDEC MS-012AC compliance. Pin functions are electrically validated per DS20005371E.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 47C16T-I/SN, the 47L16T-I/SN offers lower-voltage compatibility at the cost of incompatible VCAP sizing and trip voltage, while the FM24V10-G trades Auto-Store automation for unlimited endurance and zero store latency - requiring host firmware to explicitly manage persistence.

Availability

47C16T-I/SN is available at Aetrix Electronics and suitable for industrial automation, smart metering, and programmable controller applications requiring stable component supply, long-lifecycle support, and guaranteed traceability.

Supply support for 47C16T-I/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-I/SN belongs to Microchip's EERAM product line, engineered specifically for applications demanding seamless SRAM-like performance with EEPROM-level nonvolatility - targeting industrial control, energy infrastructure, and automotive subsystems.

FAQ

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

The VCAP pin on the 47C16T-I/SN connects to an external 5–6.8 µF capacitor that supplies hold-up energy during V_CC collapse. When V_CC drops below the Auto-Store trip voltage (4.0–4.4 V), the 47C16T-I/SN uses charge from VCAP to complete a full SRAM-to-EEPROM store within 25 ms. Without VCAP, Auto-Store must be disabled (ASE = 0) to prevent data corruption.

How does the Hardware Store (HS) pin differ from Auto-Store on the 47C16T-I/SN?

The HS pin on the 47C16T-I/SN provides deterministic, software-independent Store initiation: a ≥150 ns high pulse triggers immediate SRAM→EEPROM transfer regardless of VCAP state or VTRIP threshold. Unlike Auto-Store-which relies on monitored V_CC decay-the HS pin enables precise, event-driven persistence (e.g., triggered by watchdog timeout or tamper detection) with no timing dependency on power rail behavior.

Can the 47C16T-I/SN operate without an external capacitor?

Yes, the 47C16T-I/SN can operate without an external capacitor if Auto-Store is disabled (ASE bit = 0 in STATUS register) and the VCAP pin is tied to V_CC. In this mode, Store operations rely solely on Hardware Store (HS pin) or Software Store (COMMAND register 0x33). SRAM retains data while powered, and EEPROM backup remains accessible for manual Recall-eliminating capacitor-related BOM cost and layout area.

What is the maximum I²C clock frequency supported by the 47C16T-I/SN?

The 47C16T-I/SN supports I²C clock frequencies up to 1 MHz under specified conditions (V_CC = 4.5–5.5 V, T_A = –40°C to +85°C). This high-speed mode enables rapid bulk reads/writes-critical for logging burst sensor data or updating configuration tables-while maintaining full compatibility with standard (100 kHz) and fast-mode (400 kHz) I²C hosts.

How is write protection configured on the 47C16T-I/SN?

Write protection on the 47C16T-I/SN is controlled by BP2:BP0 bits in the nonvolatile STATUS register (address 0x00). These bits define protected SRAM address ranges-from none (000) to full array (111)-with granularity down to the upper 1/64 (7E0h–7FFh for 47C16). Protection takes effect immediately after STATUS write and persists across power cycles, preventing accidental overwrites of critical firmware or calibration data.