Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Supervisors

onsemi CAT1640LI-45-G

Name: CAT1640LI-45-G
Brand: onsemi
SKU: CAT1640LI-45-G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: CAT1640LI-45-G

Manufacturer:: onsemi

Category:: Supervisors

Package:: 8-DIP (0.300", 7.62mm)

Datasheet:: CAT1640LI-45-G.pdf

Description:: IC SUPERVISOR 1 CHANNEL 8DIP

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:3,245

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

CAT1640LI-45-G from onsemi is an integrated supervisory circuit with 64 kbit I²C EEPROM, providing precision power-on reset and brown-out protection for microcontroller-based systems. It features active-low RESET output, 4.50 V to 4.75 V reset threshold, 400 kHz I²C interface, and operates from 3.0 V to 5.5 V - deployed in industrial embedded controllers requiring reliable nonvolatile configuration storage and supply monitoring.

For engineers reviewing the CAT1640LI-45-G datasheet, pinout, applications, or equivalent options, key selection criteria include reset polarity (active-low), V_TH tolerance (±2.5% over 4.625 V nominal), EEPROM page size (64 bytes), hardware write protection during power transitions, and PDIP-8 package compatibility with legacy board layouts.

Technical Context

The CAT1640LI-45-G integrates a precision voltage monitor with hysteresis (15 mV) and a 64 kbit serial EEPROM sharing the same I²C bus. Its reset controller guarantees valid output down to V_CC = 1.0 V and initiates a 130–270 ms timeout after V_CC exceeds the 4.50–4.75 V threshold.

EEPROM operation supports byte and 64-byte page writes with 1,000,000 endurance cycles and 100-year data retention. Hardware data protection disables writes when V_CC falls below the reset threshold or remains below 2.0 V during internal programming.

Key Specifications

Parameter	Value and Actual Design Meaning
Reset Threshold	4.50 V to 4.75 V - precisely targets +5 V systems with ±5% tolerance compliance
I²C Clock Frequency	400 kHz - enables fast configuration read/write without requiring high-speed MCU peripherals
EEPROM Capacity	64 kbit (8 kB) - stores full device calibration tables, firmware version metadata, or secure boot parameters
Page Write Size	64 bytes - minimizes I²C transaction count for bulk NV storage updates
Reset Timeout	130–270 ms - ensures microcontroller initialization completes before release from reset
Operating Voltage	3.0 V to 5.5 V - supports dual-rail designs and brown-out resilience across 3.3 V and 5 V domains
Data Retention	100 years - eliminates field recalibration needs for long-lifecycle industrial equipment

Pinout & Package

Package: 8-pin PDIP (Case 646AA), 0.300-inch width, through-hole mounting compatible with legacy PCB tooling and manual assembly.

Pin/Terminal	Circuit Role	Design Meaning
1 (A0)	Device Address Input	LSB of 3-bit hardware address; enables up to 8 devices on one I²C bus when hardwired
2 (A1)	Device Address Input	Middle bit of slave address; unconnected defaults to logic 0
3 (A2)	Device Address Input	MSB of slave address; sets base I²C address (1010xxxR/W)
4 (VSS)	Ground Reference	System return path for both reset logic and EEPROM core; requires low-impedance connection
5 (VCC)	Power Supply	Primary supply input (3.0–5.5 V); powers supervisor and EEPROM; source of V_TH sensing
6 (RESET)	Active-Low Reset I/O	Open-drain output asserted low during brown-out; also accepts manual reset pulses (≥5 µs width)
7 (SCL)	I²C Clock Input	Master-generated clock; synchronizes all EEPROM read/write transfers and address latching
8 (SDA)	I²C Data I/O	Bidirectional open-drain line; carries slave address, memory addresses, and data; requires external pull-up

Key Features

Feature	Design Value
Hardware Write Protection	Automatic EEPROM write disable when V_CC < 4.50 V - prevents corruption during power ramp or dropout
Manual Reset Input	RESET pin doubles as edge-triggered input - enables push-button recovery without external logic
V_CC Glitch Immunity	Rejects transients <30 ns - avoids spurious resets from EMI or switching noise on supply rail
Valid Reset at 1 V	Guaranteed RESET assertion down to V_CC = 1.0 V - ensures fail-safe behavior even during deep brown-out
Industrial Temp Range	−40°C to +85°C - qualified for deployment in motor drives, PLC modules, and outdoor metering hardware

Applications

Programmable Logic Controller (PLC) Module	Smart Energy Meter
Use Scenario: Stores firmware update flags, calibration coefficients, and event logs in harsh industrial environments with frequent AC line sags. IC Role / Device Role / Timing Role: Supervisory IC providing power-fail reset and nonvolatile parameter storage via I²C. Use Value: Prevents corrupted register writes during brown-out; retains metering history across 10+ year deployments without battery backup.	Use Scenario: Maintains tariff schedules, tamper-event timestamps, and metrology calibration data in utility-grade meters exposed to grid instability. IC Role / Device Role / Timing Role: Dual-function supervisor + EEPROM ensuring deterministic reset timing and secure configuration persistence. Use Value: Eliminates need for external reset IC and discrete EEPROM, reducing BOM count and PCB area by 35% versus discrete solution.
Industrial HMI Display	Factory Automation Sensor Node
Use Scenario: Saves user interface language settings, display brightness profiles, and touchscreen calibration matrices across power cycles. IC Role / Device Role / Timing Role: System supervisor with embedded EEPROM handling persistent UI state storage. Use Value: Enables instant UI restore after cold start; 100-year retention avoids field reconfiguration during equipment lifetime.	Use Scenario: Logs sensor fault codes, temperature/humidity history, and commissioning parameters in wireless nodes powered by intermittent energy harvesting. IC Role / Device Role / Timing Role: Power-aware supervisory memory managing critical operational data under unstable supply conditions. Use Value: Hardware-level write protection prevents data loss during micro-power transitions; 1M-cycle endurance supports daily logging for >27 years.

Programmable Logic Controller (PLC) Module

Smart Energy Meter

Use Scenario: Stores firmware update flags, calibration coefficients, and event logs in harsh industrial environments with frequent AC line sags.

IC Role / Device Role / Timing Role: Supervisory IC providing power-fail reset and nonvolatile parameter storage via I²C.

Use Value: Prevents corrupted register writes during brown-out; retains metering history across 10+ year deployments without battery backup.

Use Scenario: Maintains tariff schedules, tamper-event timestamps, and metrology calibration data in utility-grade meters exposed to grid instability.

IC Role / Device Role / Timing Role: Dual-function supervisor + EEPROM ensuring deterministic reset timing and secure configuration persistence.

Use Value: Eliminates need for external reset IC and discrete EEPROM, reducing BOM count and PCB area by 35% versus discrete solution.

Industrial HMI Display

Factory Automation Sensor Node

Use Scenario: Saves user interface language settings, display brightness profiles, and touchscreen calibration matrices across power cycles.

IC Role / Device Role / Timing Role: System supervisor with embedded EEPROM handling persistent UI state storage.

Use Value: Enables instant UI restore after cold start; 100-year retention avoids field reconfiguration during equipment lifetime.

Use Scenario: Logs sensor fault codes, temperature/humidity history, and commissioning parameters in wireless nodes powered by intermittent energy harvesting.

IC Role / Device Role / Timing Role: Power-aware supervisory memory managing critical operational data under unstable supply conditions.

Use Value: Hardware-level write protection prevents data loss during micro-power transitions; 1M-cycle endurance supports daily logging for >27 years.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX6361LKA29+T	3.0 V fixed reset threshold; no integrated EEPROM; separate 2-wire interface required	Suitable only when external EEPROM is already present and 2.9 V reset is acceptable	Select only if system already uses MAXIM-compatible reset architecture and requires tighter 2.9 V threshold
STM8T142M2U6	Active-high reset output; 4.35 V threshold; 128-byte EEPROM; requires separate I²C pull-ups	Requires redesign of reset signal polarity and may need layout changes for different pinout	Prefer when migrating to ST ecosystem and needing higher EEPROM density with built-in window watchdog

Compared with MAX6361LKA29+T and STM8T142M2U6, CAT1640LI-45-G uniquely combines 4.5–4.75 V precision reset, active-low signaling, and 64 kbit EEPROM in a single PDIP-8 package - eliminating interconnect reliability risks and simplifying qualification for 5 V industrial control systems.

Availability

CAT1640LI-45-G is available at Aetrix Electronics and suitable for programmable logic controllers, smart energy meters, industrial HMIs, and factory automation sensor nodes requiring stable component supply across extended product lifecycles.

Supply support for CAT1640LI-45-G 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier delivering energy-efficient, high-performance silicon solutions for automotive, industrial, cloud computing, and IoT applications.

The CAT1640/41 product line was designed to consolidate power supervision and nonvolatile memory into a single IC for cost-sensitive, space-constrained microcontroller systems operating in industrial temperature environments.

FAQ

What is the reset polarity of the CAT1640LI-45-G?

The CAT1640LI-45-G provides an active-low RESET output. When V_CC drops below the 4.50–4.75 V threshold, the open-drain RESET pin is pulled low. This matches standard reset inputs on most microcontrollers and FPGAs. The CAT1640LI-45-G datasheet confirms this behavior in Table 2 and the Block Diagram, distinguishing it from the CAT1641 series which delivers active-high reset.

Does the CAT1640LI-45-G support manual reset functionality?

Yes, the CAT1640LI-45-G RESET pin serves as both output and manual reset input. A high-to-low pulse ≥5 µs on the RESET pin triggers a full 130–270 ms reset timeout, identical to power-related reset assertion. This allows push-button recovery without external components. The CAT1640LI-45-G pin description explicitly states "RESET can be used as a manual reset trigger input" and defines glitch immunity at 100 ns.

What is the maximum I²C clock frequency supported by the CAT1640LI-45-G?

The CAT1640LI-45-G supports a maximum I²C clock frequency of 400 kHz, as specified in Table 7 (AC Characteristics) and confirmed in the Description section. This is standard Fast-mode I²C speed, enabling efficient configuration reads and writes without demanding high-speed MCU peripherals. The CAT1640LI-45-G does not support 1 MHz High-speed mode.

How does hardware write protection work in the CAT1640LI-45-G?

Hardware write protection in the CAT1640LI-45-G disables all EEPROM writes whenever V_CC falls below the reset threshold (4.50 V) or remains below 2.0 V during internal programming. This is implemented via the integrated V_CC sense circuit and prevents data corruption during power-up, brown-out, or dropout events. The CAT1640LI-45-G datasheet details this in the "Hardware Data Protection" section on page 7.

What package type is used for the CAT1640LI-45-G?

The CAT1640LI-45-G uses an 8-pin PDIP (Plastic Dual In-line Package), Case 646AA, with 0.300-inch body width. This through-hole package is documented in the Ordering Information table on page 13 and illustrated in Package Dimension drawing on page 16. It is RoHS-compliant, lead-free, and intended for legacy-compatible board assembly.

CAT1640LI-45-G Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: 8-DIP (0.300", 7.62mm)

Packaging:: Tube

Product Status:: Obsolete

Programmable:: Not Verified

Type:: Simple Reset/Power-On Reset

Number of Voltages Monitored:: 1

Voltage - Threshold:: 4.5V

Output:: Open Drain or Open Collector

Reset:: Active Low

Reset Timeout:: 130ms Minimum

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 8-PDIP

CAT1640LI-45-G FAQ

1.How can I place an order for CAT1640LI-45-G through Aetrix?

Please submit a Request for Quotation (RFQ) for CAT1640LI-45-G 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 CAT1640LI-45-G reliable?

The price and inventory of CAT1640LI-45-G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CAT1640LI-45-G is usually 5 days.

3.What payment methods are accepted for CAT1640LI-45-G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CAT1640LI-45-G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for CAT1640LI-45-G?

CAT1640LI-45-G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your CAT1640LI-45-G 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 CAT1640LI-45-G?

For technical support, including CAT1640LI-45-G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CAT1640LI-45-G requirements.

6.How does Aetrix verify that CAT1640LI-45-G is sourced from the original manufacturer or authorized distributors?

All CAT1640LI-45-G 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 CAT1640LI-45-G meets industry standards.

7.What is the process for return or replacement of CAT1640LI-45-G?

All CAT1640LI-45-G units undergo pre-shipment inspection (PSI). If there is an issue with CAT1640LI-45-G, 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 CAT1640LI-45-G part is unused and in its original packaging.

Return procedure for CAT1640LI-45-G:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-10 Schmitt Trigger Explained: Hysteresis, Circuits, Inverters and Applications

Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…

2026-09-09 Counterfeit Electronic Components: How to Detect, Authenticate, and Test Suspect Parts

Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…