ELM 4-645 LED Standoff Equivalent & Substitute Parts

Part Overview

The ELM 4-645 is a T1 LED standoff manufactured by Bivar Inc., designed for vertical mounting applications with a 0.645" (16.38mm) length. This component is an active product with full RoHS3 compliance and MSL Level 1 rating, indicating unlimited moisture sensitivity tolerance. Substitute parts are identified when inventory constraints, lead time requirements, or specific application needs necessitate alternative configurations while maintaining functional compatibility within the T1 LED standoff category.

Substiute Parts

ELM 4-645

Bivar Inc.In Stock: 928ELM 4-645 Datasheet

Current PartRFQ

ELM 2-17MM

Bivar Inc.In Stock: 1852ELM 2-17MM Datasheet

Parametric EquivalentRFQ

ELM 2-665

Bivar Inc.In Stock: 909ELM 2-665 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution logic for the ELM 4-645 is based on the following allowed parameters:

Primary Compatibility Criteria:

• LED Type: T1 (mechanical interface standard)
• Material: PVC (chemical and thermal properties)
• Color: Black (visual consistency)
• Mounting Orientation: Vertical (spatial orientation)
• RoHS3 Compliance: Required for regulatory alignment
• MSL Level 1: Ensures equivalent storage tolerance

Length Tolerance Consideration: The ELM 4-645 operates at 0.645" (16.38mm). Substitute parts with lengths of 0.665" (16.89mm) and 0.670" (17.02mm) represent minor dimensional variations within the T1 LED standoff category. These alternatives are acceptable when application PCB layout permits the increased standoff height, as the core mechanical interface (T1 LED socket compatibility) remains unchanged.

Identified Substitutes:

• ELM 2-665: Length 0.665" (16.89mm) — 0.020" (0.51mm) increase
• ELM 2-17MM: Length 0.670" (17.02mm) — 0.025" (0.64mm) increase

Both substitutes maintain T1 LED compatibility, PVC material composition, black color, vertical mounting orientation, RoHS3 compliance, and MSL Level 1 rating.

Parameter Comparison

Engineering Selection Recommendations

ELM 4-645 Primary Selection: Select the ELM 4-645 when the exact 0.645" (16.38mm) standoff height is specified in PCB design documentation. This part maintains active product status with full RoHS3 compliance and unlimited MSL tolerance, ensuring regulatory alignment and storage flexibility.

ELM 2-665 Substitution: The ELM 2-665 is suitable when a 0.020" (0.51mm) increase in standoff height is acceptable within PCB layout constraints. This substitute maintains identical material, color, LED type, and compliance certifications. Inventory availability is 882 pieces.

ELM 2-17MM Substitution: The ELM 2-17MM accommodates a 0.025" (0.64mm) increase in standoff height and is applicable when PCB design permits this dimensional variation. All core parameters—LED type, material, color, mounting orientation, and compliance ratings—remain equivalent. Inventory availability is 1815 pieces, representing the highest stock level among all options.

Compliance Verification: All three parts carry ROHS3 compliance and EAR99 ECCN classification, confirming regulatory equivalence for standard commercial applications. MSL Level 1 rating across all variants ensures identical moisture sensitivity handling requirements.

Frequently Asked Questions (FAQ)

Q: Can ELM 2-665 or ELM 2-17MM be used as direct replacements for ELM 4-645?

A: Yes, within dimensional tolerance constraints. Both substitutes maintain T1 LED mechanical compatibility, PVC material composition, black color, vertical mounting orientation, and identical compliance certifications (RoHS3, MSL Level 1). The primary difference is standoff length: ELM 2-665 adds 0.020" (0.51mm) and ELM 2-17MM adds 0.025" (0.64mm). Substitution is valid only when PCB layout accommodates the increased height.

Q: What is the significance of the length difference between these parts?

A: Standoff length directly affects component clearance above the PCB surface. The ELM 4-645 provides 0.645" clearance, while substitutes provide 0.665" or 0.670". In applications with tight vertical space constraints, the original ELM 4-645 specification must be maintained. In applications with adequate clearance, the substitutes function identically.

Q: Are all three parts equivalent in terms of regulatory compliance?

A: Yes. All three parts are RoHS3 compliant, carry MSL Level 1 rating (unlimited moisture sensitivity tolerance), and share EAR99 ECCN classification. Regulatory requirements do not differentiate between these options.

Q: What packaging format is used for these parts?

A: All three parts are supplied in bag packaging, consistent with standard component distribution for LED standoff assemblies.

Q: Which substitute should be selected if both are available?

A: Selection depends on PCB layout requirements. If the additional 0.020" (0.51mm) height of ELM 2-665 is acceptable, either part functions equivalently. If maximum inventory availability is a consideration, ELM 2-17MM offers the highest stock level (1815 pieces) while maintaining full functional and compliance equivalence.