Backup Power Interface for RTC Systems

Q: What is the purpose of the Backup Power Interface?

It maintains Real-Time Clock (RTC) functionality during main power interruptions by connecting to an auxiliary power source, ensuring continuous timekeeping and memory retention.

Q: What are the key electrical specifications?

Input voltage range is 9–36 V DC, output voltage is 3.3 V DC ±5%, output current is 0.5–2 A, and switching time is less than 10 ms.

Q: What environmental conditions can it withstand?

Operating temperature is -40 to 85 °C, storage temperature is -55 to 125 °C, humidity is 5–95% RH non-condensing, and ingress protection is IP54–IP65.

Q: How should I verify compatibility with my application?

Check the connector type (2.54 mm pitch), dimensions (20×15×10 mm), and weight (10–15 g). Always confirm model-specific values and standards with the manufacturer or supplier.

Product Specifications

Technical details and manufacturing context for Backup Power Interface

Definition

The Backup Power Interface is a critical component within Real-Time Clock systems that enables connection to auxiliary power sources (typically batteries or capacitors) to ensure continuous timekeeping and memory retention when primary power is unavailable. This interface manages power switching, voltage regulation, and isolation between main and backup power sources to prevent data loss and maintain accurate time tracking during power failures. It is designed for use in industrial computer, electronic, and optical product manufacturing applications where reliable timekeeping is essential. The interface accepts a wide input voltage range of 9–36 V DC, making it compatible with various backup sources such as lithium batteries or supercapacitors. It provides a regulated output of 3.3 V DC (±5%) to power the RTC circuitry, with an output current capability of 0.5–2 A to sustain RTC and memory functions. The switching time is less than 10 ms, ensuring no data loss during power transitions. The interface operates over a temperature range of -40 to 85 °C, with a storage range of -55 to 125 °C, and is rated for non-condensing humidity of 5–95% RH. It offers ingress protection from IP54 to IP65, providing dust and water resistance suitable for industrial environments. The dielectric strength is 500 V AC for 1 minute, and insulation resistance is at least 100 MΩ at 500 V DC, both tested according to IEC 60255-5. The connector type is a pin header or box header with a 2.54 mm pitch, and the compact dimensions are 20×15×10 mm, with a weight of 10–15 g for PCB mounting. Materials include copper alloy contacts, FR-4 PCB substrate, gold plating, and a high-temperature plastic housing. This interface is a component-level product; buyers should verify model-specific values and standards with the legal manufacturer or supplier before integration.

Working Principle

The interface monitors the main power supply voltage. When it detects a drop below the operational threshold, it automatically switches to the connected backup power source (usually a lithium battery or supercapacitor). It provides regulated voltage to the RTC circuitry while isolating the backup source from the main power circuit to prevent reverse current flow. When main power is restored, it switches back and may include charging circuitry for rechargeable backup sources.

Common Materials

Copper alloy contacts, FR-4 PCB substrate, Gold plating, High-temperature plastic housing

Technical Parameters

Parameter	Typical range	Notes & selection driver
Input Voltage Range	9–36 V DC	Wide input for various backup sources
Output Voltage	3.3 ±5% V DC	For RTC power supply
Output Current	0.5–2 A	Sustains RTC and memory
Switching Time	<10 ms	No data loss during transition
Operating Temperature	-40–85 °C	Industrial grade
Storage Temperature	-55–125 °C	Extended range for logistics
Humidity	5–95 % RH	Non-condensing
Ingress Protection	IP54–IP65	Dust and water resistantIEC 60529
Dielectric Strength	500 V AC	1 minute withstandIEC 60255-5
Insulation Resistance	≥100 MΩ	At 500 V DCIEC 60255-5
Connector Type	2.54 mm pitch	Pin header or box header
Dimensions	20×15×10 mm	Compact footprint
Weight	10–15 g	Lightweight for PCB mounting

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

Power Switching Circuit
Automatically switches between main and backup power sources based on voltage monitoring

Material: Semiconductor components on PCB
Voltage Regulator
Maintains stable voltage to RTC circuitry regardless of input source variations

Material: Integrated circuit with passive components
Connector Pins Part
Provides physical and electrical connection to backup power source

Material: Gold-plated copper alloy
Isolation Diode Part
Prevents reverse current flow from backup to main power circuit

Material: Semiconductor diode
Charging Circuit Optional
Tops up a rechargeable backup cell or supercapacitor once main power is back.

Application & selection

Application Fit & Sizing Matrix

Operational Limits

pressure:	Atmospheric to 1.5 bar
other spec:	Voltage Range: 2.7V to 5.5V DC, Backup Current: <5µA
temperature:	-40°C to +85°C

Media Compatibility

✓ Industrial Control Systems ✓ Telecommunications Equipment ✓ Medical Monitoring Devices

Unsuitable: High-Vibration Environments (e.g., Heavy Machinery)

Sizing Data Required

Main Power Supply Voltage
RTC Module Power Consumption
Required Backup Duration

Risk, maintenance & compliance

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause

Battery Sulfation

Cause: Extended periods of low charge or inactivity leading to lead sulfate crystal formation on plates, reducing capacity and conductivity

Transfer Switch Failure

Cause: Mechanical wear, contact arcing, or control circuit malfunction preventing automatic switching between power sources during outages

Maintenance Indicators

Audible continuous alarm or beeping from UPS control panel indicating fault condition
Visible corrosion or swelling of battery cells with electrolyte leakage or case deformation

Engineering Tips

Implement regular load testing under simulated outage conditions to verify system response and battery capacity
Maintain clean, temperature-controlled environment with proper ventilation and scheduled battery impedance testing

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards

ISO 8528-1:2018 (Reciprocating internal combustion engine driven alternating current generating sets) ANSI/UL 2200 (Standard for Stationary Engine Generator Assemblies) IEC 60335-2-29 (Safety of household and similar electrical appliances - Particular requirements for battery chargers)

Quoted from the published standard.

Manufacturing Precision

Voltage regulation: +/- 2% of nominal output
Frequency stability: +/- 0.5 Hz at rated load

Quality Inspection

Load bank testing (verifies performance under simulated loads)
Dielectric withstand test (verifies electrical insulation integrity)

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

Compare the published product scope and source details, then include your specifications and quantity in an enquiry.

Manufacturers of Backup Power Interface

Manufacturer profiles associated with Backup Power Interface.

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Frequently Asked Questions

What is the purpose of the Backup Power Interface?

It maintains Real-Time Clock (RTC) functionality during main power interruptions by connecting to an auxiliary power source, ensuring continuous timekeeping and memory retention.

What are the key electrical specifications?

Input voltage range is 9–36 V DC, output voltage is 3.3 V DC ±5%, output current is 0.5–2 A, and switching time is less than 10 ms.

What environmental conditions can it withstand?

Operating temperature is -40 to 85 °C, storage temperature is -55 to 125 °C, humidity is 5–95% RH non-condensing, and ingress protection is IP54–IP65.

How should I verify compatibility with my application?

Check the connector type (2.54 mm pitch), dimensions (20×15×10 mm), and weight (10–15 g). Always confirm model-specific values and standards with the manufacturer or supplier.

Related equipment

Applied To / Applications

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

Real-Time Clock

View system integration details

Industrial Ecosystem & Supply Chain Structure

Complementary Systems

Downstream Applications

Specialized Tooling

Data Basis

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

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 12 October 2026

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