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Home > Products > Integrated Circuits (ICs) > Memory > Memory

Microchip Technology 47L16T-I/ST

Name: 47L16T-I/ST
Brand: Microchip Technology
SKU: 47L16T-I/ST
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 47L16T-I/ST

Manufacturer:: Microchip Technology

Category:: Memory

Package:: 8-TSSOP (0.173", 4.40mm Width)

Datasheet:: 47L16T-I/ST.pdf

Description:: IC EERAM 16KBIT I2C 1MHZ 8TSSOP

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Product details

Overview

47L16T-I/ST from Microchip Technology is a 16 Kbit (2,048 × 8) I²C serial EERAM combining volatile SRAM with nonvolatile EEPROM backup. It operates from 2.7V–3.6V, supports up to 1 MHz I²C, and delivers automatic power-loss data retention via VCAP capacitor-assisted store/recall. It serves as a drop-in replacement for battery-backed SRAM in industrial control logging and real-time configuration storage.

For engineers reviewing the 47L16T-I/ST datasheet, 47L16T-I/ST pinout, 47L16T-I/ST application, or 47L16T-I/ST equivalent, key selection criteria include its 25 ms max store time, software/hardware-triggered recall, 1 million EEPROM store cycles, Schmitt-trigger I²C inputs, and configurable write protection across 1/64 to full SRAM array.

Technical Context

The 47L16T-I/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 backup. Store and recall operations are managed by dedicated control logic that monitors VCC and VCAP voltage thresholds (VTRIP = 2.4–2.6 V), triggering automatic transfer on power-down/up or via HS pin assertion or software command.

I²C interface compliance includes standard 100 kHz / 400 kHz / 1 MHz modes, zero-cycle-delay reads/writes, and cascading support for up to four devices on one bus. The STATUS and COMMAND registers enable runtime configuration of auto-store (ASE bit), block protection (BP2–BP0), and event detection (EVENT bit), all backed by nonvolatile storage.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Density	16 Kbit (2,048 × 8 bits) - provides sufficient space for firmware state, calibration tables, or sensor history without external memory expansion
VCC Range	2.7V–3.6V - compatible with 3.3V industrial and automotive subsystems; excludes 5V-only legacy designs
Max I²C Clock	1 MHz - enables fast configuration writes and low-latency status polling in time-critical embedded hosts
Store Time	≤25 ms - guarantees full SRAM-to-EEPROM transfer before VCC drops below operational threshold
Recall Time	≤5 ms - restores valid SRAM contents rapidly at power-up, minimizing host initialization delay
EEPROM Endurance	1,000,000 store cycles - supports daily logging over >27 years without wear-out concerns
Data Retention	>200 years - ensures long-term archival integrity of stored parameters under industrial temperature stress

Pinout & Package

47L16T-I/ST is housed in an 8-lead TSSOP (Thin Shrink Small Outline Package) with 0.65 mm lead pitch, optimized for compact PCB layouts and automated assembly. Thermal performance meets industrial ambient requirements (−40°C to +85°C).

Pin/Terminal	Circuit Role	Design Meaning
1: VCAP	Auto-store capacitor connection	Must be connected to ≥8 µF tantalum/ceramic capacitor to enable automatic power-loss store; left unconnected only if ASE=0 and manual store is used exclusively
2: A1	Chip select input	Configures LSB of 3-bit device address (A2/A1/0); sets unique I²C client address when multiple 47L16T-I/ST devices share bus
3: A2	Chip select input	Configures MSB of 3-bit device address (A2/A1/0); enables up to 4 devices per I²C segment without address conflict
4: VSS	Ground reference	Primary return path for SRAM, EEPROM, and I²C interface; must be low-impedance and decoupled near package
5: VCC	Power supply	2.7V–3.6V supply powering both SRAM and EEPROM logic; internal POR circuit triggers at ~1.1 V
6: HS	Hardware store trigger	Active-high pulse (≥150 ns) initiates immediate SRAM→EEPROM store independent of VCAP or ASE setting
7: SCL	I²C clock input	Drives synchronous communication; Schmitt-trigger input rejects noise up to 300 ns spikes
8: SDA	I²C bidirectional data	Open-drain interface supporting multi-master arbitration; requires external pull-up resistor (typically 2.2–10 kΩ)

Key Features

Feature	Design Value
Automatic Store/Recall	Eliminates need for external battery or supercapacitor backup; uses single external capacitor (8 µF) to retain SRAM data across power cycles
Software Write Protection	Configurable block protection (1/64 to full array) prevents accidental overwrites of critical calibration or security keys during firmware updates
Nonvolatile Event Flag	HS pin assertion sets EVENT bit in STATUS register, enabling host MCU to detect and timestamp external events without polling
Industrial Temperature Range	Rated for −40°C to +85°C operation, validated across full VCC range and I²C speed - suitable for factory automation and outdoor telemetry
High-Reliability Memory	Infinite SRAM read/write cycles + 1M EEPROM store cycles + >200-year data retention - removes lifetime uncertainty in unattended deployments

Applications

Industrial PLC Configuration Storage	Automotive Telematics Event Logging
Use Scenario: Storing user-defined I/O mapping, PID tuning parameters, and alarm thresholds in programmable logic controllers deployed in harsh factory environments. IC Role / Device Role / Timing Role: Nonvolatile configuration register providing instant-access SRAM for runtime updates and EEPROM-backed persistence across maintenance power cycles. Use Value: Eliminates battery replacement service intervals while maintaining sub-5 ms recall latency for rapid system restart after brownouts.	Use Scenario: Capturing GPS coordinates, accelerometer-triggered crash events, and diagnostic trouble codes in vehicle black-box recorders operating at −40°C to +85°C. IC Role / Device Role / Timing Role: High-endurance data logger interfacing directly with microcontroller I²C port; HS pin captures hard-braking or impact events with nanosecond timing fidelity. Use Value: Guarantees 1M+ store cycles for daily trip logging over 10+ years, with automatic recall ensuring last-known-good state is available at boot.
Medical Infusion Pump Calibration Data	Smart Meter Firmware State Backup
Use Scenario: Securing dose calibration coefficients, usage counters, and safety lockout flags in Class II medical devices requiring regulatory-compliant data integrity. IC Role / Device Role / Timing Role: Tamper-resistant memory holding FDA-mandated audit trails; software write protection prevents unauthorized parameter modification. Use Value: Meets IEC 62304 data retention requirements with >200-year archival life and hardware-enforced write-locking of critical fields.	Use Scenario: Preserving firmware update progress, tariff schedule versions, and tamper-detection timestamps in utility smart meters exposed to wide temperature swings and grid instability. IC Role / Device Role / Timing Role: Fail-safe state keeper ensuring atomic rollback to known-good firmware image if OTA update is interrupted mid-write. Use Value: Prevents bricking during power loss by storing update metadata in EEPROM with verified CRC before committing to flash.

Industrial PLC Configuration Storage

Automotive Telematics Event Logging

Use Scenario: Storing user-defined I/O mapping, PID tuning parameters, and alarm thresholds in programmable logic controllers deployed in harsh factory environments.

IC Role / Device Role / Timing Role: Nonvolatile configuration register providing instant-access SRAM for runtime updates and EEPROM-backed persistence across maintenance power cycles.

Use Value: Eliminates battery replacement service intervals while maintaining sub-5 ms recall latency for rapid system restart after brownouts.

Use Scenario: Capturing GPS coordinates, accelerometer-triggered crash events, and diagnostic trouble codes in vehicle black-box recorders operating at −40°C to +85°C.

IC Role / Device Role / Timing Role: High-endurance data logger interfacing directly with microcontroller I²C port; HS pin captures hard-braking or impact events with nanosecond timing fidelity.

Use Value: Guarantees 1M+ store cycles for daily trip logging over 10+ years, with automatic recall ensuring last-known-good state is available at boot.

Medical Infusion Pump Calibration Data

Smart Meter Firmware State Backup

Use Scenario: Securing dose calibration coefficients, usage counters, and safety lockout flags in Class II medical devices requiring regulatory-compliant data integrity.

IC Role / Device Role / Timing Role: Tamper-resistant memory holding FDA-mandated audit trails; software write protection prevents unauthorized parameter modification.

Use Value: Meets IEC 62304 data retention requirements with >200-year archival life and hardware-enforced write-locking of critical fields.

Use Scenario: Preserving firmware update progress, tariff schedule versions, and tamper-detection timestamps in utility smart meters exposed to wide temperature swings and grid instability.

IC Role / Device Role / Timing Role: Fail-safe state keeper ensuring atomic rollback to known-good firmware image if OTA update is interrupted mid-write.

Use Value: Prevents bricking during power loss by storing update metadata in EEPROM with verified CRC before committing to flash.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
47L16-I/SN	Same 16 Kbit density and 2.7–3.6 V operation, but in 8-lead SOIC package (5.3 mm width vs. TSSOP's 3.0 mm); identical pinout and electrical specs	Preferred where board rework or hand-soldering is required; less suited for high-density automated assembly	Select 47L16-I/SN when SOIC footprint compatibility or thermal mass for reflow is prioritized over space savings
FM24V10-G	F-RAM-based 1 Mbit nonvolatile RAM (128K × 8); no store time limit, unlimited endurance, but requires 2.7–3.6 V and lacks hardware store pin or VCAP interface	Better for high-frequency write-intensive logging; unsuitable where automatic power-loss capture or HS-triggered store is mandatory	Choose FM24V10-G only if application demands continuous 100 kHz writes without wear-out concern and can forgo auto-store functionality

Compared with 47L16T-I/ST, the 47L16-I/SN offers identical functionality in a larger SOIC package for easier prototyping, while the FM24V10-G trades auto-store capability for unlimited write endurance and faster random writes - making it viable only when VCAP-based fail-safe behavior is not required.

Availability

47L16T-I/ST is available at Aetrix Electronics and suitable for industrial PLC configuration storage, automotive telematics event logging, medical infusion pump calibration data, and smart meter firmware state backup requiring stable component supply across extended product lifecycles.

Supply support for 47L16T-I/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 is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with a focus on reliability, longevity, and industrial-grade qualification.

The 47L16T-I/ST belongs to Microchip's EERAM family, designed specifically to replace battery-backed SRAM in mission-critical embedded systems where maintenance-free, long-life nonvolatile storage is essential.

FAQ

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

The VCAP pin on the 47L16T-I/ST connects to an external capacitor (minimum 8 µF) that supplies hold-up energy during power loss, enabling automatic SRAM-to-EEPROM store. If VCAP is left unconnected, Auto-Store must be disabled (ASE = 0) and manual store initiated via HS pin or software command to prevent data corruption - the 47L16T-I/ST will not operate safely in auto-store mode without this capacitor.

How does the 47L16T-I/ST handle write protection of its SRAM array?

The 47L16T-I/ST implements software-configurable write protection via three BP bits (BP2–BP0) in the nonvolatile STATUS register. These bits allow locking 1/64, 1/32, 1/16, 1/8, 1/4, 1/2, or the entire 2,048-byte SRAM array against accidental writes - ideal for safeguarding calibration constants or security keys. Protection is enforced at the hardware level: attempted writes to locked regions result in NACK and no data transfer.

Can the 47L16T-I/ST be used in automotive applications?

The 47L16T-I/ST is rated for Industrial temperature range (−40°C to +85°C) and is not AEC-Q100 qualified. While it may function in some automotive cabin environments, Microchip designates the 47L16-IM part (with "IM" suffix) for automotive use. For under-hood or safety-critical automotive applications, the 47L16T-I/ST is not recommended - engineers should verify qualification status and select AEC-Q100-compliant alternatives like 47L16-IM/ST when deploying 47L16T-I/ST in automotive systems.

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

The 47L16T-I/ST supports I²C clock frequencies up to 1 MHz, in addition to standard 100 kHz and 400 kHz modes. This high-speed capability allows rapid bulk transfers - for example, writing the full 2,048-byte SRAM array takes under 17 ms at 1 MHz (excluding store overhead). Timing compliance is guaranteed across the full industrial temperature range and 2.7–3.6 V supply, with Schmitt-trigger inputs ensuring noise immunity on SCL/SDA lines.

How does the Hardware Store (HS) pin interact with Auto-Store functionality on the 47L16T-I/ST?

The HS pin on the 47L16T-I/ST initiates an immediate SRAM-to-EEPROM store regardless of ASE bit state or VCAP voltage - it overrides Auto-Store and executes even if VCAP is below VTRIP. During active HS-triggered store, ongoing I²C transactions abort, and the device becomes unresponsive for ≤25 ms. Unlike Auto-Store, HS operation requires no external capacitor and is edge-triggered (≥150 ns pulse), making it ideal for deterministic, externally commanded data saves in safety-critical systems using 47L16T-I/ST.

47L16T-I/ST Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: 8-TSSOP (0.173", 4.40mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Programmable:: Not Verified

Memory Type:: Non-Volatile

Memory Format:: EERAM

Technology:: EEPROM, SRAM

Memory Size:: 16Kbit

Memory Organization:: 2K x 8

Memory Interface:: I2C

Clock Frequency:: 1 MHz

Write Cycle Time - Word, Page:: 1ms

Access Time:: 400 ns

Voltage - Supply:: 2.7V ~ 3.6V

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-TSSOP

47L16T-I/ST FAQ

1.How can I place an order for 47L16T-I/ST through Aetrix?

Please submit a Request for Quotation (RFQ) for 47L16T-I/ST on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for 47L16T-I/ST reliable?

The price and inventory of 47L16T-I/ST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 47L16T-I/ST is usually 5 days.

3.What payment methods are accepted for 47L16T-I/ST?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 47L16T-I/ST transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 47L16T-I/ST?

47L16T-I/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 47L16T-I/ST order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for 47L16T-I/ST?

For technical support, including 47L16T-I/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 47L16T-I/ST requirements.

6.How does Aetrix verify that 47L16T-I/ST is sourced from the original manufacturer or authorized distributors?

All 47L16T-I/ST products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 47L16T-I/ST meets industry standards.

7.What is the process for return or replacement of 47L16T-I/ST?

All 47L16T-I/ST units undergo pre-shipment inspection (PSI). If there is an issue with 47L16T-I/ST, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The 47L16T-I/ST part is unused and in its original packaging.

Return procedure for 47L16T-I/ST:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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