Wireless Doorbell PCB Circuit Board | 2-Layer 1.0mm Lead-Free HASL KB6165F

I. Product Overview: A PCB Board Engineered for Wireless Doorbell Systems

The wireless doorbell PCB circuit board is an essential electronic component in smart home and security systems. UGPCB offers this board built with Kingboard KB6165F high-performance copper-clad laminate. The manufacturing process follows strict quality controls.

This wireless doorbell PCB is a 2-layer double-sided printed circuit board. It has a 1.0mm thickness and measures 79.48 × 35.6mm. These dimensions fit perfectly into compact wireless doorbell enclosures. The board uses a lead-free HASL (Hot Air Solder Leveling) surface finish. This finish meets RoHS environmental requirements while delivering excellent solderability.

Wireless doorbells serve as the first line of defense in home security. The reliability of their circuit boards directly determines product lifespan and user experience. UGPCB understands this critical requirement. We carefully select materials and control every process step to deliver high-quality wireless doorbell PCB boards to customers worldwide.

II. Product Definition and Industry Positioning

A wireless doorbell PCB circuit board is a printed circuit board used in wireless doorbell systems. It typically consists of two parts: a transmitter board and a receiver board. The transmitter PCB carries the encoder chip (such as HT12E), a 433MHz wireless transmitter module, and the push-button switch circuit. The receiver PCB carries the decoder chip (such as HT12D), the wireless receiver module, the audio amplifier, and the speaker driver circuit.

From a PCB classification perspective, this product is a rigid double-sided printed circuit board (Rigid Double-Sided PCB) . It can be further classified as follows:

Classification Dimension	Category
Conductive Layers	Double-sided (2L)
Substrate Rigidity	Rigid Board
Surface Finish	Lead-Free HASL
Flammability Rating	UL 94 V-0
IPC Performance Class	Class 2 (Dedicated Service Electronic Products)

This product complies with IPC-6012 Qualification and Performance Specification for Rigid Printed Boards. Its substrate material, KB6165F, meets the IPC-4101/99 specification requirements.

III. Key Technical Parameters

3.1 Substrate Material: Kingboard KB6165F Copper-Clad Laminate

KB6165F is a lead-free Tg150 glass fabric copper-clad laminate manufactured by Kingboard Laminates Holdings Limited. It belongs to the FR-4 grade epoxy glass fabric laminate family. The key performance indicators are as follows:

Glass Transition Temperature (Tg) : 154°C (Test Method: IPC-TM-650 2.4.25)
Z-Axis CTE (Coefficient of Thermal Expansion) : 40 ppm/°C (50–260°C), total expansion 3.1% (Test Method: IPC-TM-650 2.4.24)
T-288 Delamination Time : >30 minutes (Test Method: IPC-TM-650 2.4.24.1)
Thermal Decomposition Temperature (Td, 5% weight loss) : 346°C (Test Method: IPC-TM-650 2.4.24.6)
Flammability Rating : UL 94 V-0
Dielectric Constant (Dk) @ 1GHz : 4.6 (Test Method: IPC-TM-650 2.5.5.2)
Dissipation Factor (Df) @ 1GHz : 0.016 (Test Method: IPC-TM-650 2.5.5.2)
Peel Strength (1 oz copper foil) : 1.4 N/mm (Test Method: IPC-TM-650 2.4.8)
Flexural Strength : 550 N/mm² (longitudinal) / 485 N/mm² (transverse) (Test Method: IPC-TM-650 2.4.4)
Moisture Absorption : 0.10% (Test Method: IPC-TM-650 2.6.2.1)
Thermal Stress : ≥240 seconds (Test Method: IPC-TM-650 2.4.13.1)

A high Tg (>150°C) means this substrate can withstand the high temperatures of lead-free soldering processes. It effectively prevents board warping and delamination during assembly. Its excellent anti-CAF (Conductive Anodic Filament) performance ensures reliability in humid environments and under long-term power-on conditions.

3.2 Board Thickness and Layer Count

The board thickness is 1.0mm with 2 layers (2L) . This thickness provides sufficient mechanical strength while supporting the thin and compact design requirements of wireless doorbell products. The double-layer design allows proper layout of RF circuits, power circuits, and control circuits on both the transmitter and receiver boards. This optimizes signal integrity and power integrity.

3.3 Dimensions

The dimensions are 79.48mm × 35.6mm. This compact size is optimized for the internal space of wireless doorbell products. It accommodates all functional circuits while fitting easily into various doorbell enclosures.

3.4 Minimum Aperture

The minimum aperture is 0.332mm. According to IPC-6012 requirements for plated-through holes, this aperture size meets the reliability needs of component lead insertion and via metallization in wireless doorbell PCB boards.

3.5 Trace Width and Spacing

The trace width is 0.42mm and the trace spacing is 0.46mm. According to IPC-2221 Generic Standard on Printed Board Design, the current-carrying capacity can be calculated using the following formula:

$I = k \cdot Δ T^{0.44} \cdot A^{0.725}$

Where:

$I$ = Maximum current-carrying capacity (amperes)
$k$ = Correction factor (0.048 for outer layers, 0.024 for inner layers)
$Δ T$ = Allowable temperature rise (°C)
$A$ = Conductor cross-sectional area (square mils)

For outer layer traces with 1 oz copper foil (1.37 mils thick) and a trace width of 0.42mm (approximately 16.5 mils), the cross-sectional area is:

$A = 16.5 \times 1.37 \approx 22.6 square mils$

At a 10°C temperature rise, the theoretical current-carrying capacity is:

$I = 0.048 \times 10^{0.44} \times {22.6}^{0.725} \approx 0.048 \times 2.75 \times 9.4 \approx 1.24 A$

This current capacity fully meets the requirements of low-power RF circuits and digital control circuits in wireless doorbell PCB boards.

3.6 Copper Foil Thickness

The copper foil thickness is 1/1OZ (1 oz on both outer layers, approximately 35μm). This thickness provides an excellent balance between current-carrying capacity, thermal conductivity, and cost. It is the standard configuration for consumer electronics PCBs.

3.7 Surface Finish: Lead-Free HASL

The surface finish is lead-free HASL (Hot Air Solder Leveling) . In this process, the PCB is immersed in molten lead-free solder alloy (typically Sn99.3Cu0.6). High-pressure hot air knives then blow across the surface to remove excess solder.

The key advantages of lead-free HASL surface finish include:

Excellent solderability : Suitable for multiple soldering cycles
Long shelf life : The solder alloy provides good storage stability
Cost-effectiveness : More economical than ENIG and other finishes
RoHS compliance : Contains no lead or other restricted substances

This surface finish meets the coating requirements specified in IPC-6012.

3.8 Solder Mask and Legend

The solder mask is green ink and the legend is white ink. Green solder mask is the most popular choice in the PCB industry. It offers excellent insulation properties, heat resistance, and visual clarity. White legend ensures that component designators, polarity marks, and other information remain clearly readable.

IV. Design Guidelines and Operating Principles

4.1 Design Guidelines

Wireless doorbell PCB design requires attention to several critical areas:

(1) RF Circuit Design
Wireless doorbells typically operate in the 433MHz ISM band. RF traces must be designed as 50Ω characteristic impedance microstrip lines or coplanar waveguides. The trace width must be precisely calculated based on the PCB material parameters (Dk = 4.6). The antenna should be placed near the PCB edge. Avoid placing it in the middle of the board or surrounding it with large ground planes.

(2) Power Integrity
The power management circuits on both transmitter and receiver boards require proper layout. Place decoupling capacitors close to IC pins following the “near and multiple” principle.

(3) Interference Mitigation
Place the receiver circuit in a corner of the PCB, away from switching power supplies and other noise sources. The crystal oscillator circuit needs its own ground plane and should be placed as close to the MCU as possible.

(4) Thermal Management
The 1.0mm board thickness combined with 1 oz copper foil provides good thermal conductivity. This effectively dissipates heat from RF power amplifiers and other heat-generating components.

4.2 Operating Principles

A wireless doorbell system consists of a transmitter and a receiver:

Transmitter Operation : When a user presses the doorbell button, the encoder chip (such as HT12E) on the transmitter PCB encodes the button signal. The 433MHz RF transmitter module then sends this encoded signal wirelessly. The transmitter typically draws about 5.6mA during operation.

Receiver Operation : The 433MHz RF receiver module on the receiver PCB continuously monitors for wireless signals. When it receives a matching encoded signal, the decoder chip (such as HT12D) decodes it. This triggers the audio amplifier circuit to drive the speaker and produce the doorbell chime.

V. Product Features and Performance Advantages

5.1 Product Features

Feature	Description
High-Reliability Substrate	Kingboard KB6165F Tg150 laminate, UL 94 V-0 flame retardant
Environmentally Friendly Lead-Free Process	Lead-free HASL surface finish, RoHS compliant
Precision Manufacturing Capability	Minimum aperture 0.332mm, supports high-density routing
Excellent Heat Resistance	T-288 >30min, withstands lead-free reflow soldering temperatures
Superior Electrical Performance	Dk=4.6, Df=0.016 @ 1GHz, suitable for RF applications
High Dimensional Accuracy	Precise 79.48×35.6mm dimensions, fits standard doorbell housings

5.2 Performance Advantages

(1) International Standard Compliance
The product is designed and manufactured in compliance with IPC-6012 Qualification and Performance Specification for Rigid Printed Boards and IPC-A-600 Acceptability of Printed Boards. The substrate meets IPC-4101/99 specification requirements.

(2) UL Safety Certification
KB6165F substrate has obtained UL certification (UL File No. E123995). Its flame retardancy rating meets UL 94 V-0. It also complies with UL 796 Standard for Printed Wiring Boards for rigid boards used as components in devices or appliances.

(3) Environmental Robustness
The low Z-axis CTE (40 ppm/°C) and excellent anti-CAF performance ensure long-term reliability under temperature cycling and humid conditions .

VI. Manufacturing Process Flow

UGPCB follows a standardized manufacturing process for wireless doorbell PCB boards:

① Incoming Material Inspection → Inspect substrate and copper foil per IPC-A-600

② Inner Layer Circuit Formation → Laminate dry film, expose, develop, and etch to form inner layer circuit patterns

③ Lamination → Laminate inner layer cores with prepreg (PP) under high temperature and pressure

④ Drilling → CNC drilling, minimum aperture 0.332mm

⑤ Electroless Copper Deposition / Panel Plating → Electroless copper deposition + full-board electroplating for interlayer electrical connection

⑥ Outer Layer Circuit Formation → Laminate film, expose, develop, pattern plate, and etch to form outer layer circuits

⑦ Solder Mask Application → Apply green solder mask ink to protect circuits and prevent soldering shorts

⑧ Surface Finish → Lead-free HASL (Hot Air Solder Leveling)

⑨ Legend Printing → Print white legend to identify component designators

⑩ Routing → CNC routing or punching to final 79.48×35.6mm dimensions

⑪ Electrical Testing → Flying probe or fixture testing for 100% open/short detection

⑫ Final Inspection → Visual and dimensional inspection per IPC-A-600

⑬ Packaging and Shipping → Vacuum packaging with moisture protection

VII. Application Scenarios and End-Use Markets

Wireless doorbell PCB boards are widely used in the following applications:

Application Scenario	Description
Residential Wireless Doorbells	Home entry doorbell systems with transmitter outdoors and receiver indoors
Smart Building Intercoms	Wireless call units for apartment building access systems
Hotel Service Call Systems	Wireless transmitter modules for hotel room service call buttons
Elderly Care Emergency Call Systems	Wireless transmitter PCBs for senior emergency help buttons
Smart Home IoT Devices	Smart doorbells with integrated Wi-Fi modules
Security and Surveillance Systems	Wireless trigger and alarm units for security equipment

wireless doorbell PCB smart home application

Wireless doorbell PCB boards are core components in consumer electronics and smart home devices. Market demand continues to grow. As smart home adoption accelerates, the need for high-quality, high-reliability wireless doorbell PCB boards is increasing rapidly.

VIII. Why Choose UGPCB Wireless Doorbell PCB Boards?

✅ Premium Substrate Material : Kingboard KB6165F Tg150 laminate with UL 94 V-0 flame retardancy ensures product safety and reliability

✅ International Standard Compliance : Design and manufacturing comply with IPC-6012, IPC-A-600, IPC-2221, and other international specifications

✅ Environmentally Friendly Lead-Free Process : Lead-free HASL surface finish meets RoHS environmental requirements

✅ Precision Manufacturing Capability : Minimum aperture 0.332mm, trace width/spacing 0.42/0.46mm for high-precision routing needs

✅ Professional RF Design Support : 50Ω impedance control and other professional design support for 433MHz wireless doorbell applications

✅ Fast Delivery : Prototypes in 4–5 days with expedited options available

IX. Inquiry and Ordering Guide

UGPCB is committed to providing high-quality wireless doorbell PCB boards and PCBA turnkey services to customers worldwide. Whether you are a hardware engineer developing a new wireless doorbell product or a procurement manager seeking a reliable PCB supplier, UGPCB is your trusted partner.

Request a quote today to receive exclusive pricing and dedicated technical support.

📧 Email : info@ugpcb.com
🌐 Website : www.ugpcb.com

Please provide your PCB design files (Gerber files), Bill of Materials (BOM), and any special process requirements. The UGPCB professional team will respond within 24 hours with an optimized PCB/PCBA solution.

Data Source Declaration

The technical data cited in this document are sourced from the following authoritative organizations and standards:

Kingboard Laminates Holdings Limited : KB-6165F Copper-Clad Laminate Technical Data Sheet
IPC — Association Connecting Electronics Industries : IPC-6012 Qualification and Performance Specification for Rigid Printed Boards
IPC — Association Connecting Electronics Industries : IPC-A-600 Acceptability of Printed Boards
IPC — Association Connecting Electronics Industries : IPC-2221 Generic Standard on Printed Board Design
IPC — Association Connecting Electronics Industries : IPC-TM-650 Test Methods Manual (2.4.4, 2.4.8, 2.4.13.1, 2.4.24, 2.4.24.1, 2.4.24.6, 2.4.25, 2.5.5.2, 2.6.2.1)
UL — Underwriters Laboratories : UL 796 Standard for Printed Wiring Boards
UL — Underwriters Laboratories : UL 94 Standard for Tests for Flammability of Plastic Materials for Parts in Devices and Appliances

Standard PCB board/

Wireless Doorbell PCB Circuit Board: High-Reliability 2-Layer Lead-Free HASL Printed Board Solution

I. Product Overview: A PCB Board Engineered for Wireless Doorbell Systems

II. Product Definition and Industry Positioning

III. Key Technical Parameters