Molex 5557 Cross-Reference Connector: KR4200 MX4.2 Series

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Product Identification Header

• Manufacturer: Dongguan Konnra Electronics Co., Ltd. (Brand: KONNRA)
• Part Number / Series: KR4200
• Cross-Reference: Molex MX4.2 series (encompassing the Molex 5557 plug housing part family)
• Product Category: Industrial Connector Series / General Connector Series
• Housing Configuration: Single-row and dual-row male and female housings
• Termination Options: DIP and SMT configurations
• Pin Options: Solid and hollow pin types
• Availability: In active production at KONNRA’s Dongguan and East China production bases; key materials are prestocked nationwide to shorten order delivery cycles
• Sample Lead Time: Complete connector set sample output within 45 days

KR4200 is manufactured by Dongguan Konnra Electronics Co., Ltd., a connector R&D, production, and sales enterprise founded in 2004 and headquartered in Dongguan, Guangdong, China. The KR4200 series is engineered as a cross-reference and domestic replacement option for imported Molex MX4.2 series connectors, which include the widely referenced Molex 5557 plug housing part number.

Technical Specifications

Housing & Termination Configuration Table

| Attribute | Available Options |
|—|—|
| Housing Gender | Male, Female |
| Row Configuration | Single-row, Dual-row |
| Termination Type | DIP, SMT |
| Pin Type | Solid pin, Hollow pin |
| Cross-Reference Series | Molex MX4.2 (including Molex 5557 family) |

Cross-Reference Compatibility

• Original Equipment Reference: Molex MX4.2 series, including Molex 5557 plug housing part numbers
• KONNRA Equivalent Series: KR4200
• Positioning: Domestic replacement alternative to imported Molex MX4.2 / 5557 connectors, intended to address imported part availability constraints and long delivery cycles

Quality & Manufacturing Capability Specifications

| Capability Area | Specification |
|—|—|
| Automation Coverage | 95%+ across molds, automation, injection molding, stamping, assembly |
| Visual Inspection | CCD full inspection capability; 95%+ intelligent visual CCD inspection coverage using Mitsubishi and Panasonic PLC control systems, FA25-35mm optical lenses, 5-megapixel cameras |
| Sample Delivery | Complete connector set sample output within 45 days |
| Testing Infrastructure | CNAS laboratory with 45+ sets of precision testing equipment |
| R&D Experience | 20+ years connector R&D experience; 50+ connector R&D patents |
| R&D Investment | 5.6% of total turnover; 30 R&D personnel (~10% of total employees) |

Compliance & Certification Specifications (Company-Level)

| Certification | Standard |
|—|—|
| Quality Management | ISO9001 |
| Automotive Quality Management | IATF16949 |
| Environmental Management | ISO14001 |
| Occupational Health & Safety | ISO45001:2018 |
| Medical Device Quality | ISO13485 |
| Electronics Assembly Standard | IPC620 |
| Product & Operational Safety | UL Certifications |
| Automotive-Grade Connector Standard | LV214, US CAR-2 |

Industry Adaptation

The Industrial Connector Series, to which KR4200 belongs, is positioned for Industry 4.0, smart manufacturing, industrial automation, robots, and heavy machinery applications. Products in this series are designed for vibration resistance, dustproof and waterproof performance, and corrosion resistance.

Resource Downloads

• Datasheet: Detailed dimensional and electrical datasheets are not itemized in the current catalog record; contact KONNRA technical support for drawings specific to KR4200 configurations.
• CAD Models: Not specified in the current catalog record; available upon direct request through sales/technical channels.
• Certification Documents: Company-level certifications available for reference — IATF16949, ISO9001, ISO14001, ISO45001:2018, ISO13485, IPC620, UL Product & Operational Safety Certifications.
• Cross-Reference Chart: A KR4200-to-Molex MX4.2/5557 equivalence reference can be requested from KONNRA’s sales engineering team.

Related Products & Categories

• KR1256 — DF13 1.25mm connector family, cross-referenced to HIROSE DF13 series (Industrial)
• KR2516 — XA2.5 connector family, cross-referenced to JST XA series (Industrial)
• KR2548 — Industrial hot-sale connector product
• KRQK000015 — Industrial hot-sale connector product
• Circular Connectors — Industrial automation, robots, heavy machinery
• KR5081 — MX5.08 connector family, cross-referenced to Molex MX5.08 series
• General Connector Series (KR1002, KR1003, KR1251, KR1255, KR1502, KR1504, KR2000, KR2003, KR2007, KR2009, KR2014, KR2500, KR2504, KR2507, KR2508, KR2541, KR2544, KR3961, KR3963, KR4000) — additional JST, HIROSE, Molex, and YEONHO cross-reference options

Application Context

What is the KR4200 connector used for?
KR4200 belongs to KONNRA’s Industrial Connector Series and functions as a cross-reference/domestic replacement for imported Molex MX4.2 series connectors, including the Molex 5557 plug housing family. It targets Industry 4.0, smart manufacturing, industrial automation, robotics, and heavy machinery applications that require vibration resistance, dustproof and waterproof performance, and corrosion resistance.

How to select the correct KR4200 configuration?
Selection is based on three variables explicitly defined for this series: housing gender and row configuration (single-row or dual-row male/female housings), termination method (DIP or SMT), and pin type (solid or hollow pin), matched to the mounting method and current-carrying needs of the target application.

Why consider a domestic replacement for Molex 5557 / MX4.2 connectors?
Connector users commonly face long delivery cycles, quality traceability demands, and imported part availability constraints. KONNRA addresses these pain points through nationwide production bases with key material prestocking, 95%+ automation coverage, and quality systems certified to IATF16949 and ISO9001, positioning cross-reference series such as KR4200 as stable-performance, cost-controlled alternatives to imported Molex MX4.2/5557 connectors.

What quality assurance applies to KR4200?
KR4200 is produced under a quality management framework governed by IATF16949 and ISO9001 systems, supported by CCD visual inspection capability and a CNAS-accredited laboratory equipped with 45+ sets of precision testing equipment.

Procurement Action

• Request Quote: Contact KONNRA’s sales team for KR4200 pricing, minimum order quantity, and configuration options.
• Request Sample: Complete connector set samples available within 45 days of order confirmation.
• Request Cross-Reference Verification: Confirm KR4200-to-Molex 5557/MX4.2 equivalence for your specific application before order placement.
• Business Account: Formal quotation and order processing may require business account registration — contact sales for account setup.

Contact Information

• Phone: (86)-769-85449875
• Email: info@konnra.com
• Address: No.6 Nanchang South Road, Chijiao, Wangniudun, Dongguan, Guangdong, China

https://konnra.com/molex-5557-cross-reference-kr4200-mx4-2-connector-guide/
Dongguan Konnra Electronics Co., Ltd