Weidmüller 999355 Terminal Block - Equivalent & Substitute Parts

Part Overview

The Weidmüller 999355 is an 8-position wire-to-board terminal block with 45° mating orientation and 5.00mm pitch, designed for through-hole PCB mounting. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and procurement planning. The part operates at 20A/300V with screw-clamp termination and is RoHS compliant.

Substiute Parts

999355

WeidmüllerIn Stock: 1068999355 Datasheet

Current PartRFQ

796689-8

TE Connectivity AMP ConnectorsIn Stock: 1058796689-8 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

The TE Connectivity AMP Connectors 796689-8 is identified as a substitute based on the following alignment criteria:

Matching Parameters:

• 8 positions per level
• 0.197" (5.00mm) pitch spacing
• 300V voltage rating
• Through-hole PCB mounting
• Screw-based wire termination
• RoHS compliant
• Side interlocking features
• Black housing color

Allowable Variations:

• Mating orientation differs (35°/145° vs. 45°/135°)
• Current rating is lower (17.5A vs. 20A)
• Wire gauge range is broader (12-30 AWG vs. 14-24 AWG)
• Screw thread size differs (M3 vs. M2.5)
• Torque specification differs (0.79 Nm vs. 0.4-0.5 Nm)
• Housing material differs (Polyamide PA66 vs. Thermoplastic Wemid)
• Contact and clamp materials differ (Brass vs. Copper Alloy)

These variations remain within acceptable substitution parameters for equivalent terminal block functionality in the 5mm pitch category.

Parameter Comparison

Engineering Selection Recommendations

The TE Connectivity 796689-8 is an active product with current manufacturing support, making it suitable for applications where the Weidmüller 999355 is no longer procurable. Both parts maintain RoHS compliance and 300V/5mm pitch specifications.

Selection of the substitute should account for the following:

• The 17.5A current rating of the substitute is lower than the original 20A specification. Applications requiring the full 20A capacity must be re-evaluated.
• The mating orientation angle differs by 10° (35° vs. 45°). PCB layout and connector positioning must be verified for mechanical compatibility.
• The substitute accepts a broader wire gauge range (12-30 AWG), providing flexibility for wire selection.
• Screw torque specifications differ, requiring adjustment of assembly procedures.

Both parts are RoHS compliant and suitable for equivalent electrical performance within the stated current and voltage parameters of the substitute.

Frequently Asked Questions (FAQ)

Q: Can the TE Connectivity 796689-8 directly replace the Weidmüller 999355 in existing designs?

A: Direct replacement requires verification of three factors: (1) PCB layout accommodation of the 10° mating orientation difference, (2) circuit current requirements do not exceed 17.5A, and (3) assembly torque procedures are updated to 0.79 Nm.

Q: What is the impact of the different mating orientation angles?

A: The 45° orientation of the original part differs from the 35° orientation of the substitute. This affects the physical angle at which the connector meets the PCB and may require PCB layout modifications or connector positioning adjustments.

Q: Are both parts suitable for the same voltage and pitch applications?

A: Yes. Both parts share identical 300V voltage rating and 0.197" (5.00mm) pitch spacing, making them compatible for applications within these electrical specifications.

Q: What wire gauges are compatible with each part?

A: The Weidmüller 999355 accepts 14-24 AWG wire. The TE Connectivity 796689-8 accepts 12-30 AWG wire, providing a broader range that includes the original specification.

Q: Are there compliance differences between the two parts?

A: Both parts are RoHS compliant. The substitute (796689-8) is REACH affected, while the original part is REACH unaffected. Compliance requirements for your application should be confirmed.

Q: What is the current availability status of each part?

A: The Weidmüller 999355 is obsolete with 1011 pieces in stock. The TE Connectivity 796689-8 is active with 1028 pieces in stock, ensuring ongoing procurement availability.