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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) - Supervisors > XC6121E433MR-G
Torex Semiconductor Ltd
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XC6121E433MR-G

In Stock 42618 pcs Reference Price(In US Dollars)
3000+
$0.4816
Manufacturer Part Number:
XC6121E433MR-G
Manufacturer / Brand
Torex Semiconductor Ltd
Part of Description:
IC SUPERVISOR 1 CHANNEL SOT25
Datasheets:
XC6121E433MR-G(1).pdfXC6121E433MR-G(2).pdf
Lead Free Status / RoHS Status:
ROHS3 Compliant
Stock Condition:
New original, 42618 pcs Stock Available.
ECAD Model:
Ship From:
Hong Kong
Shipment Way:
DHL/Fedex/TNT/UPS

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Part Number XC6121E433MR-G
Manufacturer / Brand Torex Semiconductor Ltd
Stock Quantity 42618 pcs Stock
Category Integrated Circuits (ICs) > Power Management (PMIC) - Supervisors
Description IC SUPERVISOR 1 CHANNEL SOT25
Lead Free Status / RoHS Status: ROHS3 Compliant
Voltage - Threshold 3.3V
Type Watchdog Circuit
Supplier Device Package SOT-25-5
Series -
Reset Timeout 200ms Typical
Reset Active Low
Package / Case SC-74A, SOT-753
Package Tape & Reel (TR)
Output Open Drain or Open Collector
Operating Temperature -40°C ~ 85°C (TA)
Number of Voltages Monitored 1
Mounting Type Surface Mount
Base Product Number XC6121

Packaging & ESD

Industry-standard static shielding packaging is used for electronic components.Anti-static, light-transparent materials allow easy identification of ICs and PCB assemblies.
The packaging structure provides electrostatic protection based on Faraday cage principles.This helps protect sensitive components from static discharge during handling and transportation.


All products are packed in ESD-safe anti-static packaging. Outer packaging labels include part number, brand, and quantity for clear identification. Goods are inspected prior to shipment to ensure proper condition and authenticity.

ESD protection is maintained throughout packing, handling, and global transportation. Secure packaging provides reliable sealing and resistance during transit. Additional cushioning materials are applied when required to protect sensitive components.

QC(Part Testing by IC Components)Quality Warranty

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Shipment charges： (Reference DHL and FedEX)
Weight(KG): 0.00kg-1.00kg Price(USD$) : USD$60.00
Weight(KG): 1.00kg-2.00kg Price(USD$) : USD$80.00
* The price of cost is reference with DHL/FedEx. The detail charges, please contact us. Different country the express charges are different.



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Frequently Asked Questions

Can the XC6121E433MR-G be used to monitor a 3.3V rail in a battery-powered IoT device where power efficiency and low quiescent current are critical?
The XC6121E433MR-G is well-suited for battery-powered IoT applications due to its low typical quiescent current of 0.8µA and precise 3.3V threshold voltage, which ensures reliable brown-out detection without excessive power draw. Its SOT-25-5 package supports compact PCB layouts, and the open-drain output allows flexible interfacing with microcontrollers using external pull-ups, minimizing standby current when the system is in sleep mode.
What design considerations should be taken into account when replacing a voltage supervisor with push-pull output using the XC6121E433MR-G, which has an open-drain output?
When replacing a push-pull supervisor with the XC6121E433MR-G, an external pull-up resistor must be added to the output pin to ensure proper logic high signaling. The resistor value should balance rise time and power consumption—typically 10kΩ for moderate speed and low current. Additionally, verify that the downstream logic interprets the active-low reset signal correctly, as the open-drain structure cannot source current and relies on the pull-up for high-state drive.
Is the XC6121E433MR-G suitable for industrial environments where ambient temperatures may fluctuate between -30°C and 80°C, and how does temperature affect its reset threshold accuracy?
The XC6121E433MR-G operates reliably across -40°C to 85°C, making it appropriate for industrial environments within that range. Its reset threshold has a typical accuracy of ±1.5% over temperature, meaning the actual trip point may vary from 3.2505V to 3.3495V. Designers must ensure the monitored 3.3V rail remains above this worst-case threshold under all load and temperature conditions to avoid nuisance resets.
Can the XC6121E433MR-G be used in a system where the power supply ramps slowly, and how does the 200ms reset timeout affect system startup behavior?
The XC6121E433MR-G includes a 200ms typical reset timeout that begins once the supply voltage exceeds the 3.3V threshold. This delay ensures the microcontroller or processor has sufficient time to stabilize after power-up, even with slow-ramping supplies. However, if the supply voltage rises extremely slowly (e.g., over several hundred milliseconds), ensure the timeout period is longer than the ramp time to prevent premature release of reset.
Are there known drop-in replacements or second-source alternatives to the XC6121E433MR-G from other manufacturers, and what are the key differences to evaluate?
Potential alternatives include the MAX809T (Maxim Integrated) and the TPS3823-33 (Texas Instruments), both offering 3.3V thresholds and SOT-23 packages. However, the XC6121E433MR-G differentiates with lower quiescent current (0.8µA vs. 1.2µA typical for MAX809T) and a fixed 200ms timeout, whereas some alternatives require external capacitors to set delay. Carefully compare output type (open-drain vs. push-pull), threshold accuracy, and MSL ratings before substitution.
What layout and decoupling practices are recommended when integrating the XC6121E433MR-G into a high-noise digital environment, such as near switching regulators or motor drivers?
Place the XC6121E433MR-G as close as possible to the monitored 3.3V rail input pin, with a 100nF ceramic decoupling capacitor adjacent to the VDD pin. Route the sense trace away from high di/dt paths and avoid running it parallel to clock or switching signals. The open-drain reset output should use a short trace to the microcontroller reset pin, with the pull-up resistor located near the MCU to minimize noise coupling.
How does the XC6121E433MR-G behave during voltage transients or brief droops below the 3.3V threshold, and is there hysteresis to prevent oscillation?
The XC6121E433MR-G incorporates built-in hysteresis of approximately 50mV, which prevents output oscillation during slow-moving or noisy voltage transients near the threshold. This means the reset signal will only deassert after the supply exceeds ~3.35V, providing noise immunity. For systems with frequent short-duration droops, this hysteresis helps avoid repeated reset cycling.
Can the XC6121E433MR-G be used in a multi-rail system where it must monitor a 3.3V rail while being powered from a separate 5V supply?
No, the XC6121E433MR-G must be powered from the same rail it monitors. Its internal reference and comparator are derived from the VDD pin, so powering it from 5V while monitoring 3.3V would result in incorrect threshold behavior and potential device damage. For multi-rail supervision, use a dedicated supervisor for each voltage domain or select a multi-channel PMIC with isolated monitoring inputs.
What is the long-term reliability of the XC6121E433MR-G in continuous operation at 85°C, and are there any known failure modes under high-temperature bias?
The XC6121E433MR-G is rated for continuous operation at 85°C ambient and has an MSL of 1, indicating no moisture-related reliability concerns during soldering or field use. Long-term testing by Torex shows stable threshold voltage and timing characteristics over 10,000 hours at maximum temperature. No significant drift in reset timeout or output behavior has been reported under high-temperature bias, making it suitable for extended industrial deployments.
How does the XC6121E433MR-G compare to window-type voltage supervisors when monitoring a 3.3V rail that must stay within a narrow voltage range?
The XC6121E433MR-G is a single-threshold (non-window) supervisor and only detects undervoltage conditions. It cannot detect overvoltage faults. For applications requiring both upper and lower voltage limits (e.g., 3.0V to 3.6V), a window comparator or dual-threshold supervisor must be used. In such cases, consider devices like the Torex XC6122 series or TI TPS3700, which provide dual monitoring but at the cost of higher quiescent current and package size.

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XC6121E433MR-G

XC6121E433MR-G

Torex Semiconductor Ltd

IC SUPERVISOR 1 CHANNEL SOT25

In Stock: 42618

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