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Renesas X4043S8IZ-2.7A
- Part No.:
- X4043S8IZ-2.7A
- Manufacturer:
- Renesas
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
X4043S8IZ-2.7A.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,950
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Product details
Overview
X4043S8IZ-2.7A from Intersil is a CPU supervisor IC integrating power-on reset control, watchdog timer, supply voltage supervision, and 4kbit EEPROM with Block Lock™ protection. It features active-low RESET output, 2.7–5.5V operation, 2.85–3.0V reset threshold, -40°C to +85°C temperature range, and 8-pin SOIC (Pb-free) package - used in industrial microcontroller systems requiring reliable brownout detection and nonvolatile configuration storage.
For engineers reviewing the X4043S8IZ-2.7A datasheet, X4043S8IZ-2.7A pinout, X4043S8IZ-2.7A application, or X4043S8IZ-2.7A equivalent, this page delivers verified functional identity, validated pin roles, confirmed reset timing and EEPROM endurance specs, and real-world substitution guidance for embedded system design and BOM optimization.
Technical Context
The X4043S8IZ-2.7A implements a dual-function reset architecture: power-on reset with 250ms timeout and low-VCC detection asserting RESET below 2.85V (min), holding active until VCC exceeds threshold for 200ms. Its watchdog timer monitors SDA/SCL activity and supports three timeout intervals (200ms/600ms/1.4s) via nonvolatile WD1/WD0 bits.
It embeds a 512 × 8-bit I²C EEPROM with 400kHz interface, 16-byte page write mode, 5ms typical write cycle, and programmable Block Lock™ protection covering 16–128 bytes or full array. The device uses Direct Write™ memory cells rated for 1M write cycles and 100-year data retention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7V to 5.5V - supports single-supply operation across 3.3V and 5V systems without level-shifting. |
| Reset Threshold | 2.85V to 3.0V - factory-set trip point optimized for 3.3V rail monitoring with ±150mV tolerance. |
| RESET Assertion | Active-low open-drain - requires external pull-up; asserts during power-up, brownout, and watchdog timeout. |
| EEPROM Capacity | 4kbit (512 × 8) - provides nonvolatile storage for calibration data, firmware flags, or device configuration. |
| I²C Interface | 400kHz max - compatible with standard Fast-mode I²C controllers; supports byte and 16-byte page writes. |
| Watchdog Timeout | Selectable: 200ms / 600ms / 1.4s - configured via nonvolatile WD1/WD0 bits; disabled by default. |
| Standby Current | <20µA (watchdog on), <1µA (watchdog off) - enables ultra-low-power operation in battery-backed systems. |
Pinout & Package
Package: 8-pin SOIC (JEDEC MS-012AA), Pb-free, RoHS-compliant, -40°C to +85°C operating range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 NC | No internal connection | Unbonded pins - must be left floating or tied to GND/VCC per layout best practices; no electrical function. |
| 3 RESET | Active-low reset output | Open-drain signal asserted during power-up (250ms), brownout (VCC < 2.85V), or watchdog timeout; requires external pull-up. |
| 4 VSS | Ground reference | Primary return path for all internal circuits; must connect to system ground plane with low-inductance trace. |
| 5 SDA | Serial data I/O | Bidirectional I²C data line with open-drain output; supports multi-master bus; requires pull-up resistor. |
| 6 SCL | Serial clock input | Master-generated clock controlling I²C timing; input-only; no internal pull-up. |
| 7 WP | Write protect control | High = blocks all EEPROM and control register writes; low = enables programming; used for VTRIP adjustment with 15–18V pulse. |
| 8 VCC | Power supply input | Accepts 2.7–5.5V; powers all functions including reset logic, watchdog, and EEPROM; decoupling capacitor required. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable VTRIP | Factory-set at 2.85–3.0V; reprogrammable via 15–18V pulse on WP pin to fine-tune threshold for precision rail monitoring. |
| Block Lock™ Protection | Configurable via BP2/BP1/BP0 bits to lock 16–128 bytes or full 4kbit EEPROM - prevents accidental overwrites during field updates. |
| Direct Write™ EEPROM | 1,000,000 write cycles and 100-year data retention - eliminates need for wear-leveling firmware in long-life industrial deployments. |
| Power-on Reset Timing | 250ms fixed delay after VCC stabilization - ensures sufficient time for oscillator startup and FPGA configuration before processor release. |
| Low-VCC Reset Hold | RESET remains active down to VCC = 1V and until VCC exceeds VTRIP for 200ms - guarantees clean recovery from deep brownouts. |
Applications
| Industrial PLC Controller | Medical Diagnostic Device |
|---|---|
Use Scenario: Microcontroller-based PLC module operating in factory environments with fluctuating 3.3V supply rails and frequent power cycling. IC Role / Device Role / Timing Role: CPU supervisor providing power-on reset, brownout detection at 2.85V, and watchdog timeout to recover from firmware hangs. Use Value: Prevents corrupted state execution during undervoltage events and enables automatic recovery without manual reset - improving system uptime and reducing maintenance calls. | Use Scenario: Portable ultrasound unit with battery-backed real-time clock and calibration data stored in nonvolatile memory. IC Role / Device Role / Timing Role: Combines reset supervision and EEPROM storage in one die - eliminating discrete supervisor + memory BOM items. Use Value: Reduces PCB area by 40% vs. separate ICs while ensuring calibration data integrity during battery swaps and low-power sleep modes. |
| Automotive Body Control Module | Smart Energy Meter |
Use Scenario: CAN-connected BCM subjected to load-dump transients and cold-crank voltage sags below 3.0V. IC Role / Device Role / Timing Role: Monitors 3.3V domain with 2.85V reset threshold and holds RESET until stable - preventing spurious MCU resets during cranking. Use Value: Eliminates false resets during engine start-up, maintaining CAN communication continuity and avoiding ECU reinitialization delays. | Use Scenario: Revenue-grade meter requiring tamper-proof storage of tariff tables, billing logs, and firmware version history. IC Role / Device Role / Timing Role: Provides secure, block-locked EEPROM with 1M write endurance - storing critical metering data across 15+ year service life. Use Value: Enables field-upgradable tariff logic without risk of EEPROM corruption during power interruptions or firmware updates. |
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 VTRIP programming; 256-byte EEPROM; no watchdog timer. | Lacks adjustable reset voltage and watchdog - suitable only for simple reset-only use cases without supervision flexibility. | Choose when design requires only basic reset + small EEPROM and avoids complexity of VTRIP tuning or watchdog management. |
| STM8T142M2U6 | Integrated 8-bit MCU core; 2.5–5.5V; 2.7V reset; 2kbyte EEPROM; hardware watchdog; SPI interface only. | Requires MCU firmware development; no I²C support; higher integration but greater software overhead. | Choose when system needs embedded logic for custom reset sequencing or sensor polling - not for drop-in supervisor replacement. |
Compared with MAX6361KA29+T and STM8T142M2U6, the X4043S8IZ-2.7A uniquely balances field-programmable reset voltage, I²C EEPROM accessibility, and configurable watchdog - making it optimal for cost-sensitive, firmware-light designs needing robust yet tunable supervision.
Availability
X4043S8IZ-2.7A is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, automotive body electronics, and smart metering applications requiring stable component supply, extended temperature operation, and long-term EEPROM reliability.
Supply support for X4043S8IZ-2.7A 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 high-performance analog and mixed-signal ICs for power management, precision analog, and interface applications.
The X4043/X4045 family was designed to consolidate reset, watchdog, voltage monitoring, and EEPROM into a single chip - targeting space-constrained, reliability-critical embedded systems where board area and component count reduction are essential.
FAQ
What is the exact reset threshold voltage range for X4043S8IZ-2.7A?
The X4043S8IZ-2.7A has a factory-programmed reset threshold range of 2.85V to 3.0V, specified at -40°C to +85°C. This range is optimized for 3.3V supply monitoring. The threshold is reprogrammable using a 15–18V pulse on the WP pin, allowing field calibration to match specific rail tolerances - a capability confirmed in FN8118 Rev 3.00 Section 5.
Does X4043S8IZ-2.7A support I²C Fast Mode and what is its maximum clock frequency?
Yes, X4043S8IZ-2.7A supports I²C Fast Mode with a maximum clock frequency of 400kHz, as stated in the Features section of FN8118 Rev 3.00. It uses standard I²C protocol with START/STOP conditions, ACK/NACK handshaking, and 7-bit slave addressing - enabling direct compatibility with common microcontroller I²C peripherals without additional level-shifting.
How many write cycles does the EEPROM in X4043S8IZ-2.7A support, and what is its data retention?
The EEPROM in X4043S8IZ-2.7A is built with Intersil's Direct Write™ technology and supports a minimum of 1,000,000 write cycles with 100-year data retention at +25°C, as specified on page 4 of FN8118 Rev 3.00. These values are guaranteed across the full -40°C to +85°C operating range and form the basis for long-life field deployment in industrial and medical applications.
Can the watchdog timer in X4043S8IZ-2.7A be disabled, and how is it configured?
Yes, the watchdog timer in X4043S8IZ-2.7A can be disabled by setting WD1=1 and WD0=1 in the nonvolatile control register (address 1FFh), as shown in Table on page 9 of FN8118 Rev 3.00. Configuration requires a three-step write sequence involving WEL and RWEL latches - and once set, the watchdog remains disabled across power cycles unless explicitly reconfigured.
What package type and lead finish does X4043S8IZ-2.7A use, and is it RoHS compliant?
X4043S8IZ-2.7A uses an 8-pin SOIC package (JEDEC MS-012AA) with Pb-free plus anneal termination - 100% matte tin plating - and is fully RoHS compliant per IPC/JEDEC J-STD-020, as confirmed in the Ordering Information table on page 3 of FN8118 Rev 3.00. It is rated for -40°C to +85°C operation and supports standard SnPb and Pb-free reflow profiles.
X4043S8IZ-2.7A 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:
- 2.92V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
X4043S8IZ-2.7A FAQ
1.How can I place an order for X4043S8IZ-2.7A through Aetrix?
Please submit a Request for Quotation (RFQ) for X4043S8IZ-2.7A 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 X4043S8IZ-2.7A reliable?
The price and inventory of X4043S8IZ-2.7A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X4043S8IZ-2.7A is usually 5 days.
3.What payment methods are accepted for X4043S8IZ-2.7A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X4043S8IZ-2.7A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X4043S8IZ-2.7A?
X4043S8IZ-2.7A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X4043S8IZ-2.7A 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 X4043S8IZ-2.7A?
For technical support, including X4043S8IZ-2.7A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X4043S8IZ-2.7A requirements.
6.How does Aetrix verify that X4043S8IZ-2.7A is sourced from the original manufacturer or authorized distributors?
All X4043S8IZ-2.7A 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 X4043S8IZ-2.7A meets industry standards.
7.What is the process for return or replacement of X4043S8IZ-2.7A?
All X4043S8IZ-2.7A units undergo pre-shipment inspection (PSI). If there is an issue with X4043S8IZ-2.7A, 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 X4043S8IZ-2.7A part is unused and in its original packaging.
Return procedure for X4043S8IZ-2.7A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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