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2.54mm Right Angle IDC Plug with Polarizing Tabs Matched M2545 Header

Closed End IDC Connector with Polarizing Tabs M2051R-N-R

Space-saving Closed End IDC for High Vibration Equipment Wiring

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Closed End IDC Connector with Polarizing Tabs M2051R-N-R

M2051R-N-R is a 2.54mm pitch closed-end IDC connector equipped with built-in polarizing tabs. Designed for AWG22–26 discrete single conductors, it adopts solderless insulation displacement termination for rapid manual assembly. The 90° wire exit optimizes limited internal cabinet space, while polarization design prevents reverse plugging error. Perfectly mates with M2545 straight & M2545R right-angle PCB headers, and supports M2053 protective dust cover. UL94V‑2 flame retardant nylon housing and tin/gold plated brass contacts comply with RoHS, widely used in LED lighting, power supply modules and industrial control wiring.

Fully RoHS & REACH Compliant
UL&cUL Certified
UL 94V-2 Flame Retardant Housing

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Model:
M2051R-N-R
Brand:
HRB
Code:
8536909000

2.54 Pitch IDC Closed End IDC with Polarizing Tabs

M2051R-N-R series is industry-standard 2.54mm closed end IDC connector available with integrated polarizing tabs, ranging from 2 pin to 24 pin options for diversified wiring requirements. Different from 180° feed-through IDC, its closed rear housing blocks wire pull-out and eliminates mid-cable daisy-chain wiring, featuring compact 90-degree vertical wire routing to save precious PCB enclosure space for miniaturized equipment.

Built-in polar lugs avoid mis-mating during mass production assembly to cut wiring failure rate; IDC piercing design requires no stripping or soldering, greatly speeding up harness production. Compatible with universal M2545/M2545R PCB header and M2053 dust cap to guard terminals against dust and moisture. Constructed with UL94V-2 flame resistant nylon and optional tin/gold plating contacts, the connector is fully RoHS compliant, ideal for point-to-point wiring, high-vibration household appliances, driver modules and compact consumer electronics internal interconnection.

HRB P/N definition

M2051R-N-R

① ②③④

①M2051: HRB series

②With R(Blank): Closed end 90°

③N: Number of pins: 2-24

④R: With polarizing tabs

M2051R-N-R dimensions

Part No.	Circuits	Dimensions		Part No.	Circuits	Dimensions		Part No.	Circuits	Dimensions
UL94V-2	Circuits	Dim: A	Dim: B	UL94V-2	Circuits	Dim: A	Dim: B	UL94V-2	Circuits	Dim: A	Dim: B
M2051R-2-R	2	2.54	5.08	M2051R-10-R	10	22.86	25.40	M2051R-18-R	18	43.18	45.72
M2051R-3-R	3	5.08	7.62	M2051R-11-R	11	25.40	27.94	M2051R-19-R	19	45.72	48.26
M2051R-4-R	4	7.62	10.16	M2051R-12-R	12	27.94	30.48	M2051R-20-R	20	48.26	50.80
M2051R-5-R	5	10.16	12.70	M2051R-13-R	13	30.48	33.02	M2051R-21-R	21	50.80	53.34
M2051R-6-R	6	12.70	15.24	M2051R-14-R	14	33.02	35.56	M2051R-22-R	22	53.34	55.88
M2051R-7-R	7	15.24	17.78	M2051R-15-R	15	35.56	38.10	M2051R-23-R	23	55.88	58.42
M2051R-8-R	8	17.78	20.32	M2051R-16-R	16	38.10	40.64	M2051R-24-R	24	58.42	60.96
M2051R-9-R	9	20.32	22.86	M2051R-17-R	17	40.64	43.18

Key Features

Standard 2.54mm pitch IDC, fits AWG22-26 discrete conductors
Closed end design saves in-board wiring space for compact design
Built-in polarizing tabs avoid reverse incorrect mating
IDC solder-free termination, quick tool-free assembly
Matches M2545 and M2545R PCB header for wire-to-board connection
Fits M2053 cover to protect contacts against dust & moisture
UL94V-2 flame retardant housing, RoHS compliant

Mating diagram

Designed to pair with M2053 series housing covers, effectively preventing dust, moisture and foreign debris from damaging exposed contact terminals.
M2051R-N-R: Indirect PCB mating; mates with M2545 and M2545R series PCB headers to achieve reliable wire-to-board interconnection.

Frenquently Asked Questions

Technical FAQs

Q1: What wire gauge fits M2051R-N-R feed through IDC?

A: Designed for AWG22~26 discrete single conductors, standard 2.54mm pitch.

Q2: What are the differences in Application: With vs Without Polarizing Tabs?

Answers are below:

①With Polarizing Tabs

Features integrated polarization tabs that ensure correct mating orientation.
Prevents incorrect insertion and reduces the risk of miswiring or connection errors.
Recommended for applications where reliable, error-free assembly is critical.
Available with integrated polarization tabs to prevent incorrect mating and ensure proper connector orientation during assembly

②Without Polarizing Tabs

Standard connector design without polarization features.
Offers greater mating flexibility but requires proper alignment during installation.
Suitable for applications where connector orientation is clearly identified and the risk of mis-mating is low.
Non-polarized versions are also available for applications where keying is not required.

Note: Electrical & IDC crimp performance are identical for both versions.

Q3: Can this IDC mate with PCB header directly?

A: Indirect PCB connection only, pair with M2545 vertical and M2545R right angle PCB header for wire-to-board assembly.

Q4: Is matching protective cover available?

A: Compatible with M2053 series cover to shield pins from dust, moisture and debris.

Q5: Material & flammability grade of insulator housing?

A: UL94V-2 flame retardant nylon; tin-plated copper alloy contacts, RoHS compliant.

Q6: Can it realize middle-of-cable feed-through daisy chain wiring?

A: Yes, feed-through structure allows continuous in-line wiring without cutting finished harness.

Q7: What are the advantages of a 90° IDC Closed End connector?

A: Key benefits include:

Higher mechanical reliability due to internal cable termination and reduced stress on IDC contacts.
Compact cable routing, requiring cable exit space on only one side.
Improved signal integrity with minimal cable stubs and reduced signal reflections.
Simplified assembly, as the cable is terminated at a single location.

Typical applications: Point-to-point cable assemblies, control systems, power distribution modules, and industrial equipment.

Q8: Which connector type should I choose, closed end IDC or Feed through IDC?

A: Selection depends on your application requirements:

Application	Recommended Connector
Point-to-point connections	90° IDC Closed End
Space-constrained designs	90° IDC Closed End
High-vibration environments	90° IDC Closed End
Daisy-chain wiring	180° IDC Feed through
Multi-board systems	180° IDC Feed through
Bus or distributed I/O architectures	180° IDC Feed through
Cost-sensitive cable assemblies	180° IDC Feed through

Order FAQs

Q1: Available pin counts for M2051R-N-R series?

A: Standard range from 2P to 24P, customized pin positions negotiable upon bulk order.

Q2: What’s your MOQ for regular stock items?

A: Small MOQ for in-stock specs; customized color/spec needs higher minimum order quantity.

Q3: Lead time for sample & mass production?

A: Samples ship within 1~3 working days; bulk orders around 7~15 working days based on quantity.

Q4: Can we customize housing color or contact plating?

A: Custom black/other housing color, gold plating contacts available for large-volume orders.

Q5: Are free samples available for customer test?

A: Free small quantity samples offered, buyer covers international courier freight.

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