Microchip Technology 47L16T-E/ST

Overview

47L16T-E/ST 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, Schmitt-trigger inputs, and industrial-extended temperature support (–40°C to +125°C), it serves as a robust data-retention memory in automotive powertrain controllers and industrial PLCs.

For engineers reviewing the 47L16T-E/ST datasheet, 47L16T-E/ST pinout, 47L16T-E/ST application, or 47L16T-E/ST equivalent, this page delivers verified electrical specs (VCC = 2.7–3.6 V, ICC active = 150 µA typ), timing parameters (TSTORE = 25 ms max), package mapping (8-lead TSSOP), and two validated alternative parts for SRAM+EEPROM hybrid memory selection.

Technical Context

The 47L16T-E/ST implements a dual-memory architecture: a 2,048 × 8-bit SRAM array for high-speed read/write access and a matching EEPROM array for nonvolatile retention. Its I²C client logic supports standard (100 kHz), fast (400 kHz), and fast-plus (1 MHz) modes with zero-cycle-delay reads/writes and cascading up to four devices on one bus.

Power management is handled through VCAP-based auto-store detection (VTRIP = 2.4–2.6 V), hardware Store triggering (THSPW ≥ 150 ns), and STATUS register control (ASE, AM, BP bits). The device enforces write protection from 1/64 to full SRAM array and reports external events via the EVENT flag tied to the HS pin.

Key Specifications

Pinout & Package

47L16T-E/ST is housed in an 8-lead TSSOP (Thin Shrink Small Outline Package) with 0.65 mm lead pitch, RoHS-compliant, and moisture sensitivity level (MSL) 3. This surface-mount package supports automated assembly and thermal performance suitable for extended-temperature applications.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar SRAM+EEPROM hybrid memory applications.

Compared with 47L16T-E/ST, the 47L16T-I/ST offers identical functionality at lower temperature grade and cost, while the FM24V10-G trades I²C simplicity and hardware store for faster writes and infinite endurance-requiring SPI redesign and losing HS-triggered deterministic save.

Availability

47L16T-E/ST is available at Aetrix Electronics and suitable for automotive powertrain control, industrial PLCs, medical infusion pump controllers, and smart energy metering modules requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for 47L16T-E/ST 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, FPGA, and memory solutions, serving automotive, industrial, communications, and consumer markets with vertically integrated silicon and development tools.

The 47L16T-E/ST belongs to Microchip's EERAM family-designed specifically to replace battery-backed SRAM and discrete EEPROM+SRAM combinations in mission-critical embedded systems demanding seamless nonvolatile data retention.

FAQ

What is the function of the VCAP pin on the 47L16T-E/ST?

The VCAP pin on the 47L16T-E/ST connects to an external capacitor (8–10 µF) that supplies energy during power loss, enabling automatic SRAM-to-EEPROM store when VCC drops below VTRIP (2.4–2.6 V). If VCAP is unconnected, the pin must be tied to VCC and Auto-Store disabled (ASE = 0) to prevent EEPROM corruption. This design eliminates reliance on host MCU intervention for critical data preservation.

How does the Hardware Store (HS) pin operate on the 47L16T-E/ST?

The HS pin on the 47L16T-E/ST initiates an immediate SRAM-to-EEPROM store upon receiving a high-going pulse ≥150 ns wide, regardless of VCAP state or ASE bit setting. During execution, the device halts I²C communication for up to 25 ms and sets the EVENT flag in the STATUS register. This allows deterministic, externally triggered saves-for example, on emergency shutdown or user-initiated configuration freeze.

Can the 47L16T-E/ST be used in a 5 V system?

No, the 47L16T-E/ST is specified only for VCC = 2.7 V to 3.6 V and is not 5 V tolerant. Applying 5 V to VCC or any pin exceeds absolute maximum ratings (6.5 V) and risks permanent damage. For 4.5–5.5 V operation, Microchip's 47C16 series (e.g., 47C16T-E/ST) is the compatible alternative-same density and feature set but different supply range and trip voltage.

What is the maximum I²C clock frequency supported by the 47L16T-E/ST?

The 47L16T-E/ST supports I²C clock frequencies up to 1 MHz (fast-plus mode), with guaranteed timing margins including THIGH/TLOW ≥ 500 ns, TR/TF ≤ 300 ns, and TAA ≤ 400 ns. This enables high-bandwidth configuration loading in real-time systems-such as writing full 2 KB calibration tables in under 20 ms-while maintaining noise immunity via Schmitt-triggered SDA/SCL inputs.

How is write protection configured on the 47L16T-E/ST?

Write protection on the 47L16T-E/ST is controlled by three nonvolatile BP bits (BP2–BP0) in the STATUS register, allowing protection of SRAM blocks ranging from upper 1/64 (7E0h–7FFh) to the entire 2,048-byte array. Protection is enforced at the hardware level: attempted writes to protected regions result in NACK and no data latching. Configuration persists across power cycles and requires a STATUS register write to modify.