Product Overview and Functions

Enables high-density electrical interconnection, supporting both signal and low-power transmission.
Provides strong electrical coupling, preventing signal distortion.
Possesses strong anti-interference capabilities, suppressing external electromagnetic interference (EMI).
Compact structure improves wiring efficiency, suitable for applications in extremely small spaces.
Excellent vibration resistance ensures connection stability.
Used with corresponding 0.4mm male connectors to form an ultra-low profile stack.

This series is more suitable than 0.5mm products for modern consumer electronics seeking extreme thinness.

Materials and Structure

Housing: Typically made of LCP (Liquid Crystal Polymer), flame retardant rating UL94V-0, featuring high heat resistance, dimensional stability, and low moisture absorption.
Contacts: Copper alloy or phosphor bronze, offering good elasticity and fatigue resistance.
Pins/Terminals: Brass.
Plating: Nickel (Ni) base layer + gold (Au) or tin (Sn) surface treatment; gold plating provides excellent conductivity and oxidation resistance.
Structural Features: SMT surface mount socket, ultra-thin design, supports different mating heights (commonly 0.7mm~1.5mm, etc.). Precise overall structure, suitable for automated placement.

Main Electrical and Mechanical Specifications

Pitch	0.4 mm (extremely fine pitch, high density)
Current Rating	0.31 A (per pin, some models up to 0.5 A)
Voltage Rating	30 V AC/DC
Withstand Voltage	100 V AC/min
Contact Resistance	Maximum 900 mΩ (or lower for some models)
Insulation Resistance	Initial minimum 1000 MΩ
Operating Temperature Range	-55°C ~ +85°C
Storage Temperature	-55°C ~ +88°C (product body); -40°C ~ +50°C (reel packaging)
Insertion/Withdrawal Life	50 cycles
Insertion Force	Maximum 0.918 N/pin (initial)
Withdrawal Force	Minimum 0.165 N/pin Needle
Pin retention force	Minimum 0.49 N/needle
Salt spray test	Insulation resistance remains at a high level 24 hours after mating

Specifications emphasize low current and high density, suitable for signal transmission-oriented applications. Positions can be customized.

Application Scenarios

Suitable for thin electronic products with extremely limited space and high-density interconnectivity, primarily including:

Consumer electronics: smartphones, tablets, wearable devices (smartwatches/bands), TWS earphones, camera modules, etc.
Displays and modules: OLED/LCD driver boards, wireless modules, RF/antenna modules.
Small IoT devices, medical electronics (portable devices), AR/VR glasses, etc.
Any application requiring ultra-low profile (low stacking height) and high pin count PCB stacking.

This 0.4mm pitch product is often used to replace the 0.5mm series to further reduce device size and thickness.

A 3D rendering of the fine-pitch board-to-board connector on a green PCB demonstrates different configurations and soldering methods. The 0.4mm pitch product is particularly suitable for wearable devices or camera modules requiring extreme thinness.

This document helps you intuitively understand how the 0.4mm female connector is mounted on a PCB, its compact space utilization after mating with the male connector, and its application scenarios in smartphones, wearable devices, and other real-world applications. Compared to the 0.5mm or 2.54mm series, this 0.4mm version focuses on extreme miniaturization and high pin density, making it suitable for low-power signal transmission.

Technical Documentation and Other Information

Test Reports: Available upon request.
Packaging: Bag, Tube, Reel packaging; supports SMT automated production.
Minimum Order Quantity (MOQ): 1000 pieces.
Payment and Shipping: Supports T/T, PayPal, etc.; FOB/CIF/EXW terms; shipped from Shenzhen Port.
Customization: Pole count, mating height (e.g., 0.7mm, 1.0mm, 1.5mm), plating type, etc., can all be customized.
Related products: 0.4mm male version, 0.35mm finer pitch series, etc.

Important Notes:

This is an ultra-fine pitch product. Extremely high alignment accuracy and strict reflow soldering temperature control are required during installation; otherwise, short circuits or poor contact may occur.
The current is only around 0.31A, suitable for low-power signal transmission. For higher current requirements, we recommend considering the 0.5mm or larger pitch series.
Compared to the previously inquired 0.5mm Female (BB0.5BF series), this 0.4mm version has a smaller pitch and thinner profile, but a shorter mating life (50 cycles) and higher contact resistance.
If your project requires higher transmission rates, a floating structure, or an automotive-grade temperature range, please provide detailed requirements for our sales team to recommend or customize.

If you need a pairing diagram of this 0.4mm female connector with the corresponding male connector, application pictures for specific stacking heights, or a comparative analysis with the 0.5mm/2.54mm series, please tell me more details (such as the required number of pins, mating height, and application areas), and I can provide you with more information!

The following is the 2D drawing of this product

product-554-197