MX3.0 Connector Small 5557 | 43045 Series Double‑Row Straight Pin Header (3.0 mm Pitch)
Product Highlights
✅ 3.0 mm compact dual‑row wire‑to‑board header, form‑fit compatible with Molex 43045 series (Small 5557 / MX3.0)
✅ Supports both power & signal transmission, up to 8.5 A per circuit for compact power‑dense design
✅ Positive latching & polarizing key prevent mis‑mating & accidental disconnection under vibration
✅ UL94V‑0 high‑temp housing, compatible with wave & reflow soldering processes
✅ Wide circuit range 2‑24 positions, stable supply, cost‑effective drop‑in alternative for Molex 43045 series
Technical Specifications
General Mechanical Parameters
| Item |
Specification |
| Product Type |
Double‑Row Straight Through‑hole Pin Header |
| Pitch |
3.0 mm |
| Circuit Count |
2‑24 Positions |
| Mounting Style |
Vertical Through‑hole |
| Mating Partner |
43025‑series receptacle housing |
| PCB Thickness |
Recommended 1.6 mm |
| Housing Style |
Shrouded with polarizing key & latch boss |
| Mating Cycles |
Minimum 300 cycles |
Material & Electrical Characteristics
| Item |
Specification |
| Housing Material |
High‑temp Thermoplastic UL94V‑0 |
| Contact Material |
Brass |
| Contact Plating |
Matte Tin over Nickel base |
| Rated Current |
Max 8.5 A per contact (derate with temperature rise) |
| Rated Voltage |
600 V AC/DC |
| Max Contact Resistance |
≤ 20 mΩ |
| Min Insulation Resistance |
≥ 1000 MΩ |
| Withstand Voltage |
1500 V AC / 1 min |
| Applicable Wire Gauge |
AWG 18‑30 (stranded wire only) |
Environmental & Soldering Guide
| Item |
Specification |
| Operating Temperature |
‑40 ℃ ~ +105 ℃ |
| Storage Temperature |
‑20 ℃ ~ +85 ℃ |
| Solder Process |
Wave solder / IR Reflow compatible |
| Peak Soldering Temp |
Max 265 ℃ (≤10 seconds dwell) |
| Humidity Test |
90‑95 % RH @ 40 ℃, 96 h qualified |
| Compliance |
RoHS‑2 compliant |
Product Features
- Dual‑row 3.0 mm pitch, vertical straight through‑hole construction, shrouded housing for pin protection
- Built‑in polarisation key & positive locking mechanism: anti‑misplug, anti‑drop‑out under shock & vibration
- High‑temperature LCP / PA66 UL94V‑0 housing, withstands soldering thermal stress up to 265 °C peak temp
- Brass contact with matte tin plating, low contact resistance, stable power‑signal performance
- Strict coplanarity control for consistent through‑hole soldering performance
- Full range circuit options: 2‑24 positions, supports mixed‑voltage power & signal loops
- Mates with 43025‑series receptacle housings & matched crimp terminals, fully modular harness assembly
Product Advantages
- Space‑saving density: 3.0 mm dual‑row layout achieves higher channel count within limited PCB footprint vs 4.2 mm pitch connectors.
- Anti‑failure mechanical design: polarising key eliminates reverse‑mating risk; positive lock maintains connection under vibration, reducing field failure rate.
- Broad power‑signal balance: handles both signal loops and moderate power circuits, reducing BOM part varieties for your project.
- Manufacturability friendly: strict pin coplanarity guarantees consistent through‑hole soldering yield, minimises open‑pin defects during mass production.
- Supply‑chain resilience: cost‑effective mechanical alternative for Molex 43045 series, helps mitigate OEM component shortage risk, flexible MOQ for prototyping & mass orders.
- Full‑modular ecosystem: matched housings, crimp terminals available, supports in‑house harness assembly.
Application
- Industrial automation: PLC, servo drives, sensor modules, factory control units
- Power supply & UPS: internal power‑signal interconnect for switching power supplies
- Telecom & networking: router, switch, base‑station auxiliary power connections
- Consumer electronics: medical devices, LED power drivers, household appliances
- New‑energy equipment: battery management auxiliary signal & low‑power distribution
- Test & measurement: test fixtures, lab instrument internal wiring
Customer Selection Guide
- Confirm exact circuit number (2‑24P). Do not over‑spec or under‑spec channel count.
- Define actual working current per pin: apply 30 %‑40 % current de‑rating for high‑temperature environment (> 85 ℃).
- Verify PCB thickness: this header is for standard 1.6 mm PCB; custom pin length required for non‑standard board thickness.
- Confirm mating housing: must pair with 43025‑series compatible receptacle housing and matched crimp terminals.
- Wire gauge selection: AWG 18‑22 for high‑current loops; AWG 24‑30 for pure‑signal circuits, stranded wire only; solid wire is not recommended.
- Environmental condition: if the device works under heavy vibration or high‑humidity, validate mechanical retention & thermal derating before mass production.
- For alternative‑to‑Molex project: perform mating check, solder test & environmental validation before formal project change‑over.
FAQ
1. Q: Do you have a catalogue? Can you send me the catalogue to check all your products?
A: Yes, you can contact us online or send an Email to get the catalogue.
2. Q: I can't find the product in your catalogue, can you make this product for me?
A: Our catalogue shows most of our products, but not all. Just let us know what product you need, and how many you want. If we do not have it, we can also design and make a new mould to produce it. For your reference, making an ordinary mould will take about35-45 days.
3. Q: Can you provide a sample? Are these samples free?
A: Yes, we provide 5-10 pcs of connector free samples for testing. But you have to pay for the shipping cost
4. Q: What about your delivery time?
A: Stock goods are delivered within 1 day; customized goods are delivered within 5-7days
5. Q: How to ship my order?
A: For small packages, send them by Express, such as DHL, FedEx, UPS, TNT, EMS. That's Door-to-Door service. For big packages, we can send them by Air or by sea. We use standard export cartons. We are responsible for any product damage caused during delivery.
6. Q: What kind of payment do you accept? Can I pay RMB?
A: Weaccept T/T(Wire transfer), Western Union, and PayPal. Please make sure that we can receive the same amount as the Invoice. And you can pay in RMB. No problem.
7. Q: How about your company's quality control
A: Strictly obey ISO9001, IQC, OQC, IPQC, QA occupy 10% of our Quality department. All of our products will be tested by CCD.
8. Q: I need your price list of all your products. Do you have a price list?
A: We do not have a price list of all of our products. Because we have so many items, it's impossible to make all of their prices on a list, and the prices are always changing because of the material cost and quantity. And you can give us a list of all of the items you need; we will confirm carefully one by one and give you a specification and price list
9. Q: Can you make customized products and customized packing?
A: Yes. We have made a lot of customized
products for our customers formerly (mainly wire harnesses). About customized packing, there is no problem for we put your logo or other information on the package. Just have to point out that it incurs additional cost.
10. Q: What certificates do you have?
A: CE, CQC, UL, ISO9001, ISO14001, IATF16949, ISO45001, QC080000, etc.
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