Weidmüller 999377 Terminal Block - Equivalent & Substitute Parts

Part Overview

The Weidmüller 999377 is a 9-position wire-to-board terminal block with 5mm pitch, designed for vertical mounting through PCB holes. This component features screw-clamping wire termination and is rated for 10A at 300V operation across a -20°C to 100°C temperature range. The part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system maintenance and new design implementations.

Substiute Parts

999377

WeidmüllerIn Stock: 829999377 Datasheet

Current PartRFQ

ELM099100

Amphenol PCDIn Stock: 765ELM099100 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the Weidmüller 999377 is determined by strict alignment of the following core parameters:

• Electrical Compatibility: Current rating (10A minimum), voltage rating (300V minimum), and wire gauge acceptance (12-24 AWG minimum range)
• Mechanical Compatibility: 9 positions per level, 5mm pitch spacing, vertical board-mount orientation, and through-hole mounting
• Termination Method: Screw-based wire clamping mechanism
• Environmental Tolerance: Operating temperature range and moisture sensitivity level

The Amphenol PCD ELM099100 meets these substitution criteria with compatible electrical ratings, identical pitch and position configuration, and equivalent screw termination architecture. Differences in housing material, contact plating, and maximum temperature rating do not prevent functional substitution within the specified operating envelope.

Parameter Comparison

Engineering Selection Recommendations

The Amphenol PCD ELM099100 serves as a direct functional substitute for the obsolete Weidmüller 999377. Both components share identical electrical ratings (10A, 300V), mechanical configuration (9 positions, 5mm pitch, through-hole mounting), and screw-based termination architecture. The ELM099100 offers the advantage of active product status, ensuring continued availability and supply chain stability.

The ELM099100 accepts a broader wire gauge range (12-28 AWG versus 12-24 AWG), providing greater flexibility in conductor selection. The higher maximum operating temperature (105°C versus 100°C) and PBT housing material offer enhanced thermal performance compared to the PA66 housing of the original part. Both components maintain identical moisture sensitivity classification and ECCN/HTSUS coding.

Frequently Asked Questions (FAQ)

Q: Can the Amphenol PCD ELM099100 directly replace the Weidmüller 999377 in existing designs?

A: Yes. Both components share identical pitch (5mm), position count (9), mating orientation (vertical with board), current/voltage ratings (10A/300V), and screw termination methodology. PCB footprints and mounting hole patterns are compatible.

Q: What is the significance of the different wire termination descriptions?

A: Both parts employ screw-based clamping mechanisms. The Weidmüller uses a clamping yoke with tension sleeve; the Amphenol uses a rising cage clamp. Both methods provide equivalent wire retention and electrical contact performance within the specified current and voltage ratings.

Q: Does the broader wire gauge range of the ELM099100 affect compatibility?

A: No. The ELM099100 accepts 12-28 AWG, which encompasses the 12-24 AWG range of the 999377. Designs using 12-24 AWG conductors remain fully compatible.

Q: Are there material differences that affect performance?

A: The ELM099100 uses PBT housing versus PA66 in the 999377. PBT offers superior thermal stability and chemical resistance. Both materials are suitable for the specified -20°C to 105°C operating range. Contact plating differs (brass versus copper alloy), but both are tin-plated and suitable for the electrical specifications.

Q: What is the inventory status of these parts?

A: The Weidmüller 999377 is obsolete with 730 units in stock. The Amphenol PCD ELM099100 is active with 672 units available, providing long-term supply assurance.