How to Identify a Molex Connector

July 25, 2025 / Sam Tang

Table of Contents

Molex connectors are a cornerstone of the electronics industry, prized for their reliability and adaptability in applications ranging from consumer gadgets to industrial machinery. Whether you’re an engineer designing a new circuit or a procurement specialist sourcing components, accurately identifying Molex connectors is critical to ensuring your project’s success. With numerous series and variations available, the identification process can seem daunting—but it doesn’t have to be.

This guide provides a detailed roadmap to identifying Molex connectors. We’ll cover their key features, offer a step-by-step identification process, recommend essential tools and resources, and highlight common mistakes to avoid. By the end, you’ll have the knowledge and confidence to select the right Molex connector for your needs.

What Are Molex Connectors?

Molex connectors are electrical connectors designed to link wires or cables to devices or other cables. Renowned for their durability and versatility, they serve a wide array of industries. Molex offers an extensive lineup of connector series, each tailored to specific requirements. This diversity makes precise identification essential to match the connector to your project’s demands.

Common molex connector series:

Series Name	LDZY Alternative	Pin-to-Pin Pitch	Category	Pin rows	Circuit No.	Current (Max)	Voltage (Max)	Applicable Wire (AWG)	Shroud	Lock
Pico-EZmate	A1201	1.20 mm (0.047 in)	wire to board	single	2 to 6	3 A	50 V	30 to 28	Yes	Yes
PicoBlade	A1250	1.25 mm (0.049 in)	wire to wire wire to board	single	2 to 15	2.5 A	125 V	32 to 26	Yes	No
Picoflex	D2558	1.27mm (0.05 in)	wire to board	dual	4 to 26	1.2 A	250 V	28 to 26	No	No
Pico-SPOX	A1501	1.50 mm (0.059 in)	wire to board	single	2 to 15	2.5 A	250 V	30 to 24	Yes	No
MicroBlade	A2002	2.0 mm (0.079 in)	wire to board	single	2 to 15	2 A	125 V	30 to 24	Yes	Yes
Sherlock	A2008	2.0 mm (0.079 in)	wire to board	single	2 to 15	2 A	125 V	30 to 24	Yes	Yes
Duraclik	A2018	2.0 mm (0.079 in)	wire to board	single	2 to 15	3 A	125 V	30 to 22	Yes	Yes
Mini-SPOX	A2506	2.0 mm (0.079 in)	wire to board	single	2 to 15	4 A	250 V	28 to 22	Yes	Yes
SL Modular	A2541	2.54 mm (0.100 in)	wire to wire wire to board	single	2 to 41	3 A	250 V	36 to 22	Yes	Yes
C-Grid III	A2541HA	2.54 mm (0.100 in)	wire to board	dual	2 to 42	3 A	250 V	28 to 22	Yes	Yes
KK 254	/	2.50 mm (0.098 in)	wire to board	single	2 to 43	4 A	250 V	30 to 24	Yes/No	Yes
Micro-Fit	C3030	3.0 mm (0.118 in)	wire to wire wire to board	single & dual	2 to 44	8.5 A	600 V	30 to 18	Yes	Yes
Spox 396	A3960	3.96 mm (0.156 in)	wire to board	single	2 to 46	7 A	250 V	24 to 18	Yes	Yes
Mini Fit	C4255	4.20 mm (0.165 in)	wire to wire wire to board	single & dual	2 to 48	9 A	600 V	28 to 16	Yes	Yes
Mega-Fit	C5704	5.7 mm (0.2244in)	wire to wire wire to board	single & dual	2 to 12	30 A	600 V	16 to 12	Yes	Yes

Why Identifying Molex Connectors Matters

Selecting the correct Molex connector isn’t just a technical detail—it’s a safeguard against potential problems. Misidentification can result in:

Incompatibility: The connector won’t mate with its counterpart or fit the circuit.
Performance issues: Incorrect current or voltage ratings can degrade functionality.
Physical damage: Ill-fitting connectors may harm components.
Safety hazards: Risks like short circuits or overheating can arise.

Proper identification ensures seamless integration, optimal performance, and enhanced safety, saving time and resources in the long run.

Key Features to Identify Molex Connectors

To identify a Molex connector, you need to recognize its defining characteristics. Here’s what to focus on:

Physical Characteristics
- Size and shape: Molex connectors vary in dimensions, with pitch—the distance between pin centers—being a key indicator. Common pitches include 1.0mm, 2.0mm, 2.5mm, 3.0mm, and 4.2mm.
- Pin count and configuration: Connectors range from 2 to over 50 pins, arranged in single or multiple rows.
Connector Series
- Molex categorizes its connectors into series, each with distinct traits:
  - Mini-Fit: A 4.2mm pitch connector suited for power applications.
  - Micro-Fit: A compact 3.0mm pitch option for tight spaces.
- Housing shape and terminal size further differentiate series.
Locking Mechanisms
- Molex connectors employ various locking systems for secure mating:
  - Friction lock: Relies on tension between the connector and housing.
  - Latch lock: Uses a physical latch for robust retention.
- The lock type influences compatibility and application suitability.

Step-by-Step Guide to Identifying Molex Connectors

Step 1: Determine the Type

Wire-to-Wire: Does it connect two wires together? Picture cables joining end-to-end.
Wire-to-Board: Does it link a wire to a circuit board? If so, check if the pins go through the board (through-hole) or sit on top (surface-mount).

Step 2: Measure the Pitch
Grab a digital caliper and measure the distance between the centers of two adjacent pins. Accuracy matters—2.5 mm and 2.54 mm may seem similar, but they point to different connectors. Record your measurement in millimeters.

Step 3: Count the Number of Positions
Simply count the pins or slots. A 2-position connector has two pins, a 5-position has five, and so on. This helps narrow your options.

Step 4: Look for Markings or Labels
Inspect the connector for molded or printed details—part numbers (like 43025, 43045), series names, or the Molex logo. These hints can quickly identify the series.

Step 5: Compare with Known Molex Series
Match your findings with common Molex series using available tables or images. Cross-check the type, pitch, and positions, and consider the connector’s typical application for confirmation.

Tips and Tricks for Accurate Identification

Avoid pitfalls and boost accuracy with these practical tips:

Steer Clear of Mistakes: Misjudging pitch is a common error—double-check your caliper readings. Also, don’t assume a connector is Molex just because it looks familiar; verify with markings or specs.
Use Proper Tools: A digital caliper is a must for precise pitch measurement. For tiny markings, a magnifying glass can help.
Consult Official Datasheets: Found a part number or series name? Look it up in Molex’s official datasheets to confirm details.

Conclusion

Accurately identifying Molex connectors is a vital skill for any electronics project. By mastering their key features, following a structured identification process, and leveraging the right tools, you can ensure compatibility and sidestep costly errors.

Still need help or exploring options beyond Molex? Contact LDZY Electronics for expert guidance and cost-effective connector solutions.