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

Renesas X5043S8Z-4.5A

Name: X5043S8Z-4.5A
Brand: Renesas
SKU: X5043S8Z-4.5A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: X5043S8Z-4.5A

Manufacturer:: Renesas

Category:: Supervisors

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: X5043S8Z-4.5A.pdf

Description:: IC SUPERVISOR 1 CHANNEL 8SOIC

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Product details

Overview

X5043S8Z-4.5A from Intersil is a CPU supervisor IC integrating power-on reset control, watchdog timer, supply voltage supervision, and 4Kbit SPI EEPROM in an 8-lead SOIC package. It features a 4.63V ±2.5% V_TRIP, 1.4s watchdog timeout (default), and 3.3MHz SPI interface - used to safeguard microcontroller operation during power-up, brownout, or software lockup in embedded systems.

For engineers reviewing the X5043S8Z-4.5A datasheet, X5043S8Z-4.5A pinout, X5043S8Z-4.5A application, or X5043S8Z-4.5A equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and validated alternative parts for industrial, communications, and computer system designs requiring integrated reset + memory functionality.

Technical Context

The X5043S8Z-4.5A implements a dual-function reset architecture: power-on reset with 200ms nominal timeout and low-V_CC detection at 4.63V ±2.5%, asserting active-low RESET until V_CC exceeds V_TRIP and stabilizes for 200ms. Its watchdog timer monitors CS/WDI transitions and defaults to 1.4s timeout via nonvolatile WD0/WD1 bits in the status register.

It embeds a 512 × 8-bit SPI EEPROM with block lock protection (BL0/BL1 bits), Direct Write™ cell technology (1M write cycles, 100-year retention), and supports 16-byte page writes with 5ms typical write cycle time. All operations use standard SPI protocol with MSB-first framing and WREN/WRSR/READ/READ instruction set.

Key Specifications

Parameter	Value and Actual Design Meaning
V_TRIP	4.63V ±2.5% - precise reset threshold for 4.5–5.5V V_CC systems; reprogrammable via VP=15–18V sequence
Watchdog Timeout	1.4s (default, WD1=0, WD0=0) - factory-set nonvolatile timeout; selectable from 200ms/600ms/1.4s/disabled
SPI Clock Rate	3.3MHz - enables fast configuration and EEPROM access without MCU clock dependency
EEPROM Endurance	1,000,000 write cycles - supports frequent calibration/data logging in field-deployed equipment
Standby Current	<10µA (WDT off), <50µA (WDT on) - critical for battery-backed or energy-constrained applications
Reset Valid Down To	V_CC = 1V - ensures reliable reset assertion even during deep brownout conditions
Package	8-lead SOIC (Pb-free) - industry-standard footprint compatible with automated PCB assembly

Pinout & Package

Package: 8-lead SOIC (Pb-free), RoHS compliant, 0°C to +70°C operating temperature range.

Pin/Terminal	Circuit Role	Design Meaning
1: CS/WDI	Chip Select / Watchdog Input	Active-low enable for SPI; falling edge resets watchdog timer; high-to-low transition required after power-up to initiate operation
2: WP	Write Protect Input	Hardware lock: LOW disables all nonvolatile writes (EEPROM & status register); overrides software write enable
3: SO	Serial Output	Push-pull data output; shifts out EEPROM contents or status register on SCK falling edge
4: VSS	Ground	Reference return path for all internal circuits and I/O pins
5: VCC	Supply Voltage	4.5–5.5V input; powers reset generator, watchdog, EEPROM, and SPI logic; also used as programming reference for V_TRIP adjustment
6: SCK	Serial Clock Input	Controls timing of SPI transfers; data latched on rising edge (SI), output changes on falling edge (SO)
7: SI	Serial Input	Receives opcodes, addresses, and write data; latched on rising edge of SCK
8: RESET/RESET	Reset Output	Open-drain active-low reset signal; asserted during power-up, brownout (V_CC < 4.63V), or watchdog timeout

Key Features

Feature	Design Value
Reprogrammable V_TRIP	Adjustable 4.63V threshold using 15–18V VP on WP pin - eliminates need for external resistor networks or custom BOMs
Block Lock™ Protection	Selective EEPROM write protection (0%, 25%, 50%, or 100%) via nonvolatile BL0/BL1 bits - prevents accidental firmware corruption
Direct Write™ EEPROM	1M write endurance and 100-year data retention - suitable for long-life industrial deployments without refresh cycles
Integrated Watchdog Timer	Nonvolatile timeout selection (200ms/600ms/1.4s/disabled) - survives power cycling and retains setting across full V_CC range
Hardware + Software Write Protection	Combines WP pin (hardware disable) with WREN latch and status register lock - multi-layer defense against unintended writes

Applications

Communications Equipment	Industrial Process Control
Use Scenario: Routers and switches storing configuration, MAC tables, and boot parameters. IC Role / Device Role / Timing Role: Supervisor + nonvolatile memory - provides power-fail-safe storage and automatic reset during voltage sag or reboot. Use Value: Prevents config loss during brownout; enables rapid recovery without host intervention using factory-default reset behavior.	Use Scenario: PLCs and remote I/O modules retaining calibration data, fault logs, and operational settings. IC Role / Device Role / Timing Role: System guardian - asserts RESET if microcontroller hangs, while preserving critical runtime data in protected EEPROM blocks. Use Value: Eliminates need for separate reset IC and serial EEPROM, reducing BOM count and board area by ~40% vs discrete solution.
Desktop Computers	Battery-Powered Equipment
Use Scenario: Motherboard BIOS/UEFI parameter storage and power sequencing coordination. IC Role / Device Role / Timing Role: Power-on reset controller - holds CPU in reset until V_CC and clock stabilize, then releases at precisely 4.63V ±2.5%. Use Value: Guarantees deterministic boot sequence across voltage tolerances; avoids race conditions between VRMs and processor startup.	Use Scenario: Portable medical devices and handheld test instruments requiring long-term data logging with ultra-low standby current. IC Role / Device Role / Timing Role: Low-power supervisor - draws <10µA when watchdog is disabled and CS is high, extending battery life. Use Value: Enables >5-year battery operation in always-on monitoring mode without compromising reset reliability.

Communications Equipment

Industrial Process Control

Use Scenario: Routers and switches storing configuration, MAC tables, and boot parameters.

IC Role / Device Role / Timing Role: Supervisor + nonvolatile memory - provides power-fail-safe storage and automatic reset during voltage sag or reboot.

Use Value: Prevents config loss during brownout; enables rapid recovery without host intervention using factory-default reset behavior.

Use Scenario: PLCs and remote I/O modules retaining calibration data, fault logs, and operational settings.

IC Role / Device Role / Timing Role: System guardian - asserts RESET if microcontroller hangs, while preserving critical runtime data in protected EEPROM blocks.

Use Value: Eliminates need for separate reset IC and serial EEPROM, reducing BOM count and board area by ~40% vs discrete solution.

Desktop Computers

Battery-Powered Equipment

Use Scenario: Motherboard BIOS/UEFI parameter storage and power sequencing coordination.

IC Role / Device Role / Timing Role: Power-on reset controller - holds CPU in reset until V_CC and clock stabilize, then releases at precisely 4.63V ±2.5%.

Use Value: Guarantees deterministic boot sequence across voltage tolerances; avoids race conditions between VRMs and processor startup.

Use Scenario: Portable medical devices and handheld test instruments requiring long-term data logging with ultra-low standby current.

IC Role / Device Role / Timing Role: Low-power supervisor - draws <10µA when watchdog is disabled and CS is high, extending battery life.

Use Value: Enables >5-year battery operation in always-on monitoring mode without compromising reset reliability.

Equivalent & Alternatives

The following parts are listed as comparable options for similar CPU supervisor with EEPROM applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX6361KA29+T	Fixed 2.93V reset threshold; no reprogrammable V_TRIP; 2Kbit EEPROM; 100k write cycles	Lacks V_TRIP tuning and higher EEPROM endurance - unsuitable where precision brownout response or frequent logging is required	Choose only if fixed 2.93V threshold matches system rail and EEPROM update frequency is low (<10k cycles lifetime)
MCP9808-E/SN	Temperature sensor IC - no reset, watchdog, or EEPROM functions; I²C interface	Fundamentally different device class - cannot substitute for supervisor functionality	Not a functional alternative; included only as common mis-selection due to similar part numbering - verify function before substitution

Compared with MAX6361KA29+T and MCP9808-E/SN, X5043S8Z-4.5A uniquely combines field-adjustable reset voltage, 1M-cycle EEPROM, and configurable watchdog in one SOIC-8 package - making it the only viable drop-in replacement for legacy Intersil-based designs requiring 4.63V supervision and robust nonvolatile storage.

Availability

X5043S8Z-4.5A is available at Aetrix Electronics and suitable for communications equipment, industrial process control, and desktop computer systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for X5043S8Z-4.5A 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

Intersil (now part of Renesas Electronics) is a semiconductor company specializing in power management, precision analog, and interface ICs for industrial, computing, and communications markets.

The X5043 family was designed as an integrated CPU supervisor with serial EEPROM to reduce system cost and board space in microcontroller-based applications requiring reliable power sequencing and nonvolatile parameter storage.

FAQ

What is the exact reset threshold voltage for X5043S8Z-4.5A?

The X5043S8Z-4.5A has a factory-programmed V_TRIP of 4.63V ±2.5%, specified for operation within the 4.5–5.5V V_CC range. This value is permanently stored but can be reprogrammed to a higher voltage using the VP=15–18V sequence on the WP pin - a capability not found in most competing supervisors. The reset remains valid down to V_CC = 1V.

Does X5043S8Z-4.5A support both active-low and active-high reset outputs?

No - X5043S8Z-4.5A provides only an active-low open-drain RESET output. The datasheet confirms RESET/RESET is active-low for the X5043 variant; the active-high version is designated X5045S8Z-4.5A. Pin 8 on X5043S8Z-4.5A must be pulled up externally to generate a logic-high reset signal for compatible microcontrollers.

How is the watchdog timeout configured on X5043S8Z-4.5A?

The watchdog timeout on X5043S8Z-4.5A is set via two nonvolatile bits (WD0 and WD1) in the status register, programmed using the WRSR instruction. Default factory setting is WD1=0, WD0=0 → 1.4s timeout. Other options are 200ms (WD1=1, WD0=0), 600ms (WD1=0, WD0=1), or disabled (WD1=1, WD0=1). Settings persist across power cycles.

Can X5043S8Z-4.5A's EEPROM be partially write-protected?

Yes - X5043S8Z-4.5A supports four levels of block lock protection via BL0/BL1 bits: none (00), upper quarter (01), upper half (10), or full array (11). Protection is enforced at hardware level and cannot be overridden by software commands or WP pin state when enabled. This allows safe storage of bootloader code or calibration constants while permitting runtime updates to user data sections.

What is the maximum SPI clock frequency supported by X5043S8Z-4.5A?

X5043S8Z-4.5A supports a maximum SPI clock frequency of 3.3MHz under recommended operating conditions (V_CC = 4.5–5.5V). This is confirmed in the AC Electrical Specifications table (page 14) and enables efficient read/write operations without requiring MCU clock scaling. Timing parameters including t_SU, t_H, t_DIS, and t_V are fully characterized at this rate.

X5043S8Z-4.5A Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tube

Product Status:: Obsolete

Programmable:: Not Verified

Type:: Simple Reset/Power-On Reset

Number of Voltages Monitored:: 1

Voltage - Threshold:: 4.62V

Output:: Open Drain or Open Collector

Reset:: Active Low

Reset Timeout:: 100ms Minimum

Operating Temperature:: 0°C ~ 70°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

X5043S8Z-4.5A FAQ

1.How can I place an order for X5043S8Z-4.5A through Aetrix?

Please submit a Request for Quotation (RFQ) for X5043S8Z-4.5A 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 X5043S8Z-4.5A reliable?

The price and inventory of X5043S8Z-4.5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X5043S8Z-4.5A is usually 5 days.

3.What payment methods are accepted for X5043S8Z-4.5A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X5043S8Z-4.5A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for X5043S8Z-4.5A?

X5043S8Z-4.5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your X5043S8Z-4.5A 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 X5043S8Z-4.5A?

For technical support, including X5043S8Z-4.5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X5043S8Z-4.5A requirements.

6.How does Aetrix verify that X5043S8Z-4.5A is sourced from the original manufacturer or authorized distributors?

All X5043S8Z-4.5A 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 X5043S8Z-4.5A meets industry standards.

7.What is the process for return or replacement of X5043S8Z-4.5A?

All X5043S8Z-4.5A units undergo pre-shipment inspection (PSI). If there is an issue with X5043S8Z-4.5A, 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 X5043S8Z-4.5A part is unused and in its original packaging.

Return procedure for X5043S8Z-4.5A:

1.Submit a request within 90 days.

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

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