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Produktübersicht: What Is an OSP Antioxidant PCB Circuit Board?
EinOSP antioxidant PCB circuit board usesBio -Lötbarkeitskonservierungsmittel (OSP) as its copper surface finish. This process deposits an ultra-thin organic film on bare copper surfaces. The film prevents oxidation during storage and assembly. During soldering, the flux quickly dissolves the OSP film. This exposes clean copper for reliable solder joints.
UGPCB’s OSP antioxidant PCB circuit board usesFR-4 glass epoxy laminate as the base material. It features 35μm (1 oz) Kupferfolie, 1.6mm board thickness, and dimensions of 68.36 × 34.6mm. The minimum finished hole size is 0.45mm. Minimum trace width is 0.15mm and minimum spacing is 0.20mm. The product fully complies with IPC-6012E (rigid printed board qualification and performance) and IPC-4555 (high-temperature OSP performance) Spezifikationen.
Dasdouble-sided OSP PCB serves consumer electronics, Kommunikationsausrüstung, and industrial controls. It works best where cost sensitivity and surface flatness matter most.
Scientific Product Classification
Based on international PCB classification systems, this product falls into these categories:
| Classification Dimension | Kategorie |
|---|---|
| Substratmaterial | FR-4 epoxy glass fabric rigid PCB |
| Anzahl der Schichten | Doppelseitig (two-layer circuitry) |
| Oberflächenbeschaffung | OSP (Bio -Lötbarkeitskonservierungsmittel) antioxidant |
| Entflammbarkeitsbewertung | UL 94 V-0 |
| IPC Performance Class | Klasse 2 (dedicated service electronic products) |
| Dicke der Kupferfolie | 1 oz (35μm) standard copper |
| Brettdicke | 1.6mm standard rigid board |
| Hole Type | Through-hole compatible with SMT |
Key Technical Parameters Explained
Substrat: FR-4 Epoxy Glass Fabric
FR-4 is the most common rigid substrate in the Leiterplatte Industrie. “FR” means flame-retardant. “4” indicates epoxy resin combined with glass fabric that meetsUL 94 V-0 flammability standards. UL 94 V-0 requires vertical specimens to self-extinguish within10 Sekunden after two 10-second flame applications. No flaming drips may ignite cotton.
Die Glasübergangstemperatur (Tg) measures heat resistance. Standard FR-4 Tg ranges from 130–140°C. Mid-Tg FR-4 reaches 150–160°C. High-Tg FR-4 exceeds 170°C. This product uses standard FR-4 with Tg ≥ 130°C (IPC-4101/21 compliant). This meets the thermal shock demands of reflow soldering (peak temperatures 240–260°C).
Dicke der Kupferfolie: 35μm (1 oz)
Copper thickness determines current-carrying capacity. This product uses35μm Kupferfolie, known as1 Oz Kupfer (1 oz/ft² ≈ 35μm). Gemäß IPC-2221, 1 oz copper at 10°C temperature rise carries approximately:
- 0.15mm (6 Mil) Spurenbreite: 0.5–0.7A
- 0.20mm (8 Mil) Spurenbreite: 0.8–1.0A
The 35μm copper thickness is the most common standard for double-sided PCBs. It balances cost, current capacity, and manufacturing yield.
Brettabmessungen: 68.36 × 34.6mm
The finished board measures68.36mm × 34.6mm. This compact size suits tight electronic modules. Small PCBs demand tighter precision—dimensional tolerances typically stay within ±0.15mm (IPC-6012 Klasse 2).
Minimum Finished Hole Size: 0.45mm
0.45mm is the minimum plated through-hole (PTH) diameter. This hole size is a standard in the industry. It ensures reliable plating (aspect ratio approximately 3.6:1 with 1.6mm board thickness). The hole size accommodates most DIP components and standard SMT pad designs.
PCB Thickness: 1.6mm
1.6mm is the most common board thickness in PCB manufacturing. It provides excellent mechanical strength and flexural rigidity. It matches standard connectors and sockets perfectly.
Spurenbreite und Abstand: 0.15mm / 0.20mm
This product offersminimum trace width of 0.15mm (um 6 Mils) Undminimum spacing of 0.20mm (um 8 Mils). According to IPC classification, these dimensions fall intoKlasse 2 (dedicated service electronic products). This precision meets most medium-density PCB designs, including MCU control boards, power management modules, and interface converter boards.
How OSP Antioxidant Process Works
The OSP process grows an ultra-thin organic film on clean bare copper throughchemical adsorption. The OSP film mainly consists ofalkyl benzimidazole compounds (azole-based). Film thickness typically ranges from0.2–0.5μm.
Protection Mechanism
The OSP film protects copper surfaces through three mechanisms:
- Physical barrier – The organic film forms a dense molecular layer. It blocks oxygen and moisture from contacting the copper surface.
- Chemical adsorption – Active groups in OSP molecules bond chemically with copper atoms. This creates strong adhesion.
- Selective protection – The OSP film covers only copper areas. It does not affect solder mask or other non-metallic regions.
Behavior During Soldering
During SMT reflow, temperatures reach190–230°C. The flux’s active ingredients decompose and dissolve the OSP film. This exposes clean copper underneath. Solder directly contacts bare copper and formsintermetallic compounds (IMC). This creates reliable electrical connections. The OSP filmcompletely decomposes with no residue after soldering.
Key Performance Characteristics
Based on IPC-TM-650 test methods:
| Merkmal | Typischer Wert / Erfordernis | Reference Standard |
|---|---|---|
| OSP Film Thickness | 0.2–0.5μm | IPC-4555 |
| Solder Wetting Angle | ≤30° (nach 1 Reflow) | IPC-TM-650 2.4.1 |
| Solder Spread Ratio | ≥80% | IPC-TM-650 2.4.1 |
| Oxidation Protection (ambient) | ≥6 months | IPC-4555 |
| Contact Resistance Change | ≤10% (nach 6 months storage) | IPC-TM-650 |
OSP Antioxidant PCB Manufacturing Process
OSP antioxidant PCB manufacturing follows strict process controls. Every step affects final quality and reliability.
Front-End Processes (Substrate Preparation & Schaltungsstrukturierung)
- Materialschnitt – Cut FR-4 copper-clad laminate to size
- Bohren – CNC drilling with 0.45mm minimum hole size
- Chemisches Kupfer / Electroplating – Metallize hole walls for layer-to-layer connection
- Circuit Pattern Transfer – Dry film / wet film exposure and development
- Radierung – Remove unwanted copper to create 0.15mm trace / 0.20mm spacing circuitry
- Solder Mask Printing – Apply green or other colored solder mask ink
- Pre-Clean – Remove oxides and contaminants before surface finish
OSP Coating Process (Core Process)
The typical OSP coating flow:
Degreasing → Double Water Rinse → Micro-Etching → Double Water Rinse → Acid Pickling → DI Water Rinse → OSP Film Formation → Air Drying → DI Water Rinse → Final Drying
- Micro-Etching – Removes copper oxides and creates a uniform microscopically rough surface. This promotes OSP film growth.
- OSP Film Formation – Immerse the PCB in OSP chemistry (alkyl benzimidazole, organic acids, copper chloride, and deionized water). The film grows through chemical adsorption on copper surfaces.
- Film Thickness Control – Precise control is critical. Too thin means poor heat resistance. Too thick hinders flux action and solder flow.
Back-End Processes
- Routenführung – CNC routing to final dimensions
- Elektrische Tests – Flying probe or fixture testing
- Endinspektion – Visual inspection and film thickness sampling
- Vacuum Packaging – Moisture-proof and oxidation-proof packaging
Product Features and Core Advantages
Excellent Surface Flatness
The OSP film is only0.2–0.5μm thick. It forms through chemical adsorption with uniform thickness and a smooth surface. This preserves the original copper foil flatness. It is ideal forfine-pitch SMT Komponenten (such as 0.4mm and below pitch QFP, QFN packages).
Hervorragende Lötbarkeit
The OSP film dissolves quickly in flux during reflow. This exposes fresh copper for reliable IMC formation. The OSP process supports bothDurchgangsloch (Tht) Undsurface-mount (SMT) Löten.
Cost-Effective
OSP uses no precious metals (Gold, Silber, Palladium). Material and processing costs are lower than ENIG, Eintauchen Silber, or immersion tin. For high-volume production like consumer electronics, OSP offers exceptional cost competitiveness.
Environmentally Compliant
OSP uses organic compounds. It contains no lead, mercury, cadmium, or hexavalent chromium. It fully meetsRoHS 2.0 Anforderungen. Waste treatment costs and complexity are also lower than metal finishing processes.
Short Processing Time
OSP coating is simple and fast. It needs no complex plating equipment or long deposition times. Compared to ENIG (which takes hours), OSP completes surface finishing in30–60 minutes pro Charge. This significantly reduces lead times.
Design Guidelines and Important Considerations
Design für die Fertigung (DFM) Rules
Based on this product’s process capabilities:
| Design Parameter | Product Capability | Recommended Design Value |
|---|---|---|
| Mindestspurenbreite | 0.15mm | ≥0.15mm (Signalspuren) |
| Minimum Spacing | 0.20mm | ≥0.20mm |
| Mindestlochgröße | 0.45mm | ≥0.45mm |
| Brettdicke | 1.6mm | 1.6mm (Standard) |
OSP Process Limitations and Mitigations
OSP offers many benefits but has inherent limitations:
- Limited Shelf Life – OSP film protects for6 Monate in ambient conditions. For best solderability, complete SMT assembly within 3 Monate.
- Moisture Sensitivity – OSP films degrade in high-temperature, high-humidity environments. Store boards at20–25°C with 40–60% relative humidity.
- Limited Reflow Cycles – Standard OSP withstands1–2 reflow thermal shocks. Multiple reflows require high-temperature OSP (IPC-4555 compliant).
- Electrical Test Challenges – The OSP film is insulating. It affects electrical test contact reliability. Test points need solder paste printing to remove the OSP layer.
Storage and Handling Recommendations
- Vacuum-sealed packaging with desiccant and humidity indicator cards
- Speicherumgebung: temperature ≤30°C, relative humidity ≤60%
- Complete soldering within48 Std. of opening the package
- Wear anti-static gloves during handling. Avoid bare hand contact with board surfaces.
Typische Anwendungsszenarien
OSP antioxidant PCB circuit boards serve many industries due to theircost advantage, surface flatness, and excellent solderability:
Unterhaltungselektronik
- Smartphone motherboards and tablet PCBs
- Computer motherboards and graphics cards
- Home appliance control boards
- Wearable device circuit boards
Kommunikationsausrüstung
- Router and switch PCBs
- Communication modules and IoT devices
- Bluetooth / Wi-Fi module carrier boards
Industriekontrollen
- PLC programmable logic controllers
- Power management modules
- Instrumentation circuit boards
- Motor drive control boards
Kfz -Elektronik (Non-Safety-Critical)
- In-vehicle infotainment systems
- Karosseriesteuermodule
- Sensor interface boards
Quality Assurance and Standards Compliance
Applicable Standards
UGPCB’s OSP antioxidant PCB product strictly follows these international standards:
| Standard | Title | Umfang |
|---|---|---|
| IPC-4555 | Performance Specification for High Temperature Organic Solderability Preservatives (OSP) for Printed Boards | OSP process requirements and testing |
| IPC-6012E | Qualifikations- und Leistungsspezifikation für starre Leiterplatten | Finished board quality and performance |
| IPC-4101/21 | Specification for Glass-Reinforced Epoxy Laminate | FR-4 substrate technical requirements |
| IPC-TM-650 | Test Methods Manual | Various performance test methods |
| UL 94 V-0 | Flammability of Plastic Materials | Substrate flame retardant safety |
| RoHS 2.0 | Restriction of Hazardous Substances | Environmental compliance |
Key Quality Indicators
Per IPC requirements, key quality metrics include:
- OSP Film Thickness: 0.2–0.5μm, uniformity tolerance ≤ ±0.1μm
- Adhesion: ≥4B (IPC-TM-650 2.4.29 cross-cut test)
- Solder Spread Ratio: ≥80% (IPC-TM-650 2.4.1)
- Oxidation Protection Period: ≥6 months (ambient conditions)
- Entflammbarkeitsbewertung: UL 94 V-0
Why Choose UGPCB for OSP Antioxidant PCBs?
Präzisionsfertigungskapazitäten
- 0.15mm minimum trace width / 0.20mm minimum spacing
- 0.45mm minimum finished hole size
- 1.6mm standard board thickness with excellent compatibility
Reliable OSP Process Control
- Strict adherence to IPC-4555 for film thickness and quality
- Full traceability throughout the manufacturing process
- Solderability testing and film thickness sampling for every batch
Schnelle Lieferung
- Standard lead time: 7–10 working days
- Supports both prototype sampling and volume production
Comprehensive Technical Support
- Free DFM design review
- Professional engineering team for product selection guidance
Get a Quote Today
UGPCB delivers high-value OSP antioxidant PCB circuit board solutions. Whether you needprototype sampling odervolume production, we provide professional technical support and competitive pricing.
📞 How to Get a Quote:
- Submit your Gerber files and BOM list
- Our engineering team responds with a customized solution and quote within24 Std.
- Free DFM check to ensure your design passes the first time
Data Source Statement: The technical data and standard requirements cited in this document are primarily derived from IPC (Verband zur Verbindung der Elektronikindustrie) standards including IPC-4555 “Performance Specification for High Temperature Organic Solderability Preservatives (OSP) for Printed Boards,” IPC-6012E “Qualifikations- und Leistungsspezifikation für starre Leiterplatten,” IPC-4101/21 “Specification for Glass-Reinforced Epoxy Laminate,” IPC-TM-650 “Test Methods Manual,” und UL 94 “Standard for Tests for Flammability of Plastic Materials for Parts in Devices and Appliances.” Some process parameters reference publicly available technical data from leading PCB manufacturers. All data has been verified for accuracy.
