Voltage Monitor for Tamper Detection | Component Specifications

Product Specifications

Technical details and manufacturing context for Voltage Monitor

Definition

The Voltage Monitor is a specialized electronic component used within a Tamper Detection Circuit. Its primary function is to continuously measure the voltage level in a circuit and report it to a control system. By comparing the measured voltage against predefined thresholds, it detects anomalies that may indicate unauthorized physical or electrical interference, such as short-circuiting, power interruption, or tampering attempts. The component serves as the primary sensing element in the tamper detection system, triggering an alert signal when voltage deviates beyond acceptable ranges.

This component is designed for integration into electronic systems where monitoring of supply or signal voltage is critical. It operates over an input voltage range of 3–30 V DC, with a typical accuracy of ±0.5% at 25°C. The response time, defined as the time to output change after threshold crossing, ranges from 10 to 100 ms. The device is specified for an operating temperature range of -40 to 85°C and a storage temperature range of -55 to 125°C. Quiescent current at nominal supply is between 1 and 5 mA. The output is open-collector, active low, requiring a pull-up resistor, and can sink 10–50 mA. Threshold hysteresis of 0.5–2% prevents oscillation at the threshold point. Depending on the housing option, ingress protection ranges from IP40 to IP67 per IEC 60529. Typical weight for a PCB-mount version is 10–50 g.

Materials used include semiconductor silicon, copper conductors, and epoxy resin encapsulation. These materials provide electrical performance and mechanical protection. The Voltage Monitor is a component-level product; its specifications must be verified for the specific model and application. Buyers should confirm parameters such as input voltage range, accuracy, response time, and environmental ratings with the legal manufacturer or supplier before integration. The component is not a standalone system and requires proper circuit design for correct operation.

Working Principle

The voltage monitor operates by continuously sampling the circuit voltage using integrated comparators or analog-to-digital converters. It compares the measured voltage against preset upper and lower thresholds. When the voltage falls outside the acceptable range, indicating a potential tampering event, the monitor triggers an alert signal. The output is an open-collector active-low signal that requires a pull-up resistor. Hysteresis is incorporated to prevent rapid toggling near the threshold. The response time, typically 10–100 ms, determines how quickly the alert is generated after a threshold crossing.

Common Materials

Semiconductor silicon, Copper conductors, Epoxy resin encapsulation

Technical Parameters

Parameter	Typical range	Notes & selection driver
Input Voltage Range	3–30 V DC	Operating range for monitored voltage
Voltage Accuracy	±0.5 %	Typical accuracy at 25°C
Response Time	10–100 ms	Time to output change after threshold crossing
Operating Temperature	-40–85 °C	Full performance range
Storage Temperature	-55–125 °C	Non-operating storage
Supply Current	1–5 mA	Quiescent current at nominal supply
Output Type	Open-collector	Active low, requires pull-up
Output Current	10–50 mA	Maximum sink current
Threshold Hysteresis	0.5–2 %	Prevents oscillation at threshold
Ingress Protection	IP40–IP67	Depends on housing optionIEC 60529
Weight	10–50 g	Typical for PCB-mount version

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Voltage Divider Network
Scales high input voltages to measurable levels for the monitoring circuit

Material: Precision resistors
Comparator Circuit
Compares measured voltage against reference thresholds to detect anomalies

Material: Operational amplifier IC
Output Driver
Generates alert signals when tampering is detected

Material: Transistor array
Protection Circuit
Prevents damage from voltage spikes and transients

Material: Zener diodes and capacitors

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Tamper Detection Circuit

View system integration details

Manufacturers of Voltage Monitor

1 company lists this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

ETEK Microelectronics

Jiangsu, CN

ISO 26262

Also makes: Power Management, Buffer/Driver, Smart Meter and 3 more

Listed on the company's own website · profile compiled by CNFX from public sources

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Frequently Asked Questions

What is the typical input voltage range for this voltage monitor?

The input voltage range is specified as 3–30 V DC. However, this is a reference range; the actual operating range may vary by model. Always verify with the manufacturer's datasheet for the specific part.

How does the voltage monitor detect tampering?

It continuously compares the measured circuit voltage against predefined thresholds. If the voltage deviates beyond acceptable limits, indicating events like short-circuiting or power interruption, it triggers an alert signal to the control system.

What is the output type and how should it be interfaced?

The output is open-collector, active low, requiring a pull-up resistor. It can sink 10–50 mA. This allows connection to digital inputs of microcontrollers or logic circuits.

What environmental conditions can this component withstand?

The operating temperature range is -40 to 85°C, and storage temperature is -55 to 125°C. Ingress protection ranges from IP40 to IP67 depending on housing. Confirm the specific rating for your chosen model.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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accuracy:	±0.5% of reading
temperature:	-40°C to +85°C
response time:	<10ms
voltage range:	0-600V DC/AC
operating humidity:	0-95% RH non-condensing

Voltage Monitor

Product Specifications

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