PJ-322 DIP 3.5mm audio jack is a standard through-hole (DIP) audio connector designed for 3.5mm TRS / TRRS headphone plugs. It supports stereo audio transmission and microphone signal interaction, available in 4-pin and 5-pin versions. The 5-pin model integrates an automatic switch that disconnects the internal speaker when headphones are inserted. Widely used in speakers, radios, game consoles, learning machines, portable players and other consumer and industrial devices, it has become a classic audio interface choice for its stable mounting, reliable mating and strong compatibility.
I. Company Introduction
With more than ten years of focus on R&D and manufacturing of precision audio connectors, we have built a complete industrial chain covering mold development, terminal stamping, automated assembly and full-performance testing. Equipped with audio distortion testers, insertion/extraction force testing machines, high-low temperature test chambers and other equipment, our monthly production capacity of PJ-322 DIP audio jacks exceeds 20 million pieces, supporting efficient mass orders and customization.
We fully comply with ISO9001 and ISO14001 management systems. Products are RoHS and REACH certified. Each batch undergoes full inspection with complete quality traceability records established.
II. Core Product Features
DIP Through-Hole Package, Stable & Vibration-Resistant
Featuring a DIP through-hole design, the 4-pin / 5-pin terminals are vertically inserted and soldered to the PCB, providing higher connection strength and better vibration resistance than SMT packages, ideal for devices with frequent plugging or strong vibration.
Terminals are made of oxygen-free copper with excellent conductivity, resisting cold joints and solder cracks after soldering, supporting automated soldering lines for improved efficiency and consistency. The 5-pin version supports automatic audio switching: built-in speaker muted when headphones are inserted, perfect for speakers and portable players.
High-Fidelity Transmission, Pure Sound Without Crosstalk
Contacts are high-purity oxygen-free copper with gold plating ≥ 0.3μm, contact resistance ≤ 50mΩ for minimal signal loss. Left channel, right channel and microphone terminals are separately arranged to effectively isolate crosstalk. Frequency response covers the full 20Hz–20kHz audio band with distortion ≤ 0.01%, faithfully reproducing original sound for music and voice calls.
Durable Plugging & Anti-Misinsertion, Stable Feel
Internal elastic reeds maintain insertion/extraction force at 3–5N for smooth operation, avoiding poor contact or excessive wear. Anti-misinsertion guide structure prevents reverse plug damage. Reeds feature self-cleaning action to wipe away oxidation. Plugging life exceeds 10,000 cycles, far exceeding the industry average of 5,000 cycles.
Wide Temperature & Multi-Protection for Harsh Environments
Housing uses UL94 V-0 flame-retardant plastic with superior insulation and heat resistance, operating stably in -40℃~85℃. Selected models include a dust cap to block dust and moisture when not in use, ensuring long-term stable contact and reducing maintenance.
III. Product Advantages
Stable Installation & Wide Compatibility
DIP package fits various PCB designs with firm, anti-loosening solder joints. Suitable for speakers, radios, game consoles, etc. The 5-pin switching function eliminates extra audio circuit design costs.
Reliable Performance & High Consistency
Fully automated production and testing keep batch defect rate below 0.1%. Rated load: DC30V 0.5A, insulation resistance ≥1000MΩ, withstand voltage AC500V. Wide temperature and long service life ensure stable long-term operation.
Cost-Effective & Stable Supply
Standard mass production lowers unit cost. Regular models in stock with short lead times. Customizable housing color, pin length, dustproof rating, etc. Standard custom samples delivered within 2 working days.
Practical Functions & Flexible Design
4-pin for basic stereo audio; 5-pin with auto-switch for audio routing. Vertical and horizontal mounting versions available to fit compact PCB layouts.
IV. Product Applications
Consumer Electronics: Radios, portable speakers, learning machines, game consoles, for headphone audio output with automatic switching.
Industrial Control: Industrial intercoms, portable detectors, car navigation, where DIP structure ensures stable audio under vibration.
Medical Devices: Patient monitors, hearing test instruments, with high-fidelity transmission for clear voice and test signals.
DIY Electronics: Popular choice for audio DIY projects including speakers, sound cards and headphone adapters.
V. FAQ
Q1: What is the difference between 4-pin and 5-pin PJ-322 DIP?
A1: The 4-pin version supports stereo audio only. The 5-pin version adds one switch pin that disconnects the internal speaker when headphones are inserted, enabling automatic audio output switching.
Q2: How to ensure good contact after soldering?
A2: Wave soldering or manual soldering is recommended, with temperature controlled at 260℃±10℃ and duration 3–5 seconds to avoid thermal damage. Clean PCB pads and terminals before soldering to prevent cold joints. Test continuity and contact resistance after soldering.
Q3: Does it support microphone function?
A3: Yes. Models compatible with 3.5mm TRRS plugs include L, R, MIC and GND terminals, supporting both audio playback and microphone pickup for voice calls.
