SLM-550 LED Standoff Equivalent & Substitute Parts

Part Overview

The SLM-550 is a T1/T1 3/4 LED standoff manufactured by Bivar Inc., constructed from black nylon with a length of 0.550" (13.97mm). This component is classified as an active product and serves as a mechanical support and alignment fixture for LED assemblies in electronic equipment. The part is ROHS3 compliant with MSL rating of 1 (Unlimited), indicating suitability for standard storage and handling conditions.

Equivalent substitute parts are necessary when the primary SLM-550 is unavailable due to inventory constraints, supply chain disruptions, or when design specifications permit dimensional tolerance variations within acceptable engineering limits.

Key Parameters

Parameter	Value	Specification Basis
LED Type	T1, T1 3/4	Physical compatibility with LED form factor
Material	Nylon	Mechanical and thermal properties
Color	Black	Visual and optical properties
Length	0.550" (13.97mm)	Dimensional fit in assembly
RoHS Status	ROHS3 Compliant	Environmental and regulatory compliance
Product Status	Active	Ongoing availability and support

Substitute Part Grouping Explanation

Substitution eligibility for the SLM-550 is determined by strict alignment of the following parameters:

Critical Parameters (Must Match Exactly):

LED Type: T1, T1 3/4
Material: Nylon
Color: Black
RoHS Compliance: ROHS3 Compliant
Product Status: Active

Allowable Variation Parameter:

Length: Dimensional tolerance of ±0.021" (±0.53mm) from the nominal 0.550" (13.97mm) specification

The three substitute parts listed (705820135, 705820140, 705820145) are manufactured by Würth Elektronik and meet all critical parameters. Each substitute differs only in length dimension, falling within the allowable tolerance band for mechanical interchangeability in standard LED standoff applications.

Parameter Comparison

Manufacturer Part Number	Manufacturer	LED Type	Material	Color	Length (inches)	Length (mm)	RoHS Status	Product Status	Inventory (Pcs)
SLM-550	Bivar Inc.	T1, T1 3/4	Nylon	Black	0.550"	13.97	ROHS3 Compliant	Active	695
705820135	Würth Elektronik	T1, T1 3/4	Nylon	Black	0.531"	13.50	ROHS3 Compliant	Active	982
705820140	Würth Elektronik	T1, T1 3/4	Nylon	Black	0.551"	14.00	ROHS3 Compliant	Active	2530
705820145	Würth Elektronik	T1, T1 3/4	Nylon	Black	0.571"	14.50	ROHS3 Compliant	Active	2407

Engineering Selection Recommendations

All three substitute parts (705820135, 705820140, 705820145) maintain ROHS3 compliance and active product status, ensuring regulatory conformance and ongoing manufacturer support equivalent to the SLM-550.

705820140 presents the closest dimensional match to the SLM-550, with a length of 0.551" (14.00mm) versus the nominal 0.550" (13.97mm), representing a variance of only 0.001" (0.03mm). This part carries the highest inventory level at 2530 pieces.

705820135 offers a length of 0.531" (13.50mm), representing a reduction of 0.019" (0.47mm) from the SLM-550 specification. This part is suitable for applications where reduced standoff height is acceptable within assembly constraints.

705820145 provides a length of 0.571" (14.50mm), representing an increase of 0.021" (0.53mm) from the SLM-550 specification. This part is suitable for applications where increased standoff height is required or tolerated within assembly design parameters.

Frequently Asked Questions (FAQ)

Q: What determines whether a part can substitute for the SLM-550?

A: Substitution is determined by matching LED type (T1/T1 3/4), material (Nylon), color (Black), and RoHS compliance status (ROHS3). Length variations within ±0.021" (±0.53mm) are permissible for mechanical interchangeability.

Q: Are the Würth Elektronik parts (705820135, 705820140, 705820145) direct replacements?

A: These parts are parametric equivalents meeting all critical specifications. Length differences exist but fall within acceptable dimensional tolerance for standard LED standoff applications. Assembly fit verification is required for specific mechanical constraints.

Q: What is the significance of the length variations among substitute parts?

A: Length variations affect the vertical spacing between the LED and the mounting surface. Selection depends on the specific assembly design requirements and available clearance in the end application.

Q: Why is inventory level relevant to part selection?

A: Inventory levels indicate supply availability. Higher inventory (705820140 at 2530 pcs) provides greater assurance of continued availability compared to lower inventory levels.

Q: Do all substitute parts carry the same compliance certifications?

A: All listed parts are ROHS3 compliant and maintain active product status. Würth Elektronik substitutes carry REACH Unaffected designation, providing additional regulatory clarity for European applications.

Q: Can packaging differences affect substitution decisions?

A: All parts are supplied in Bag packaging format, ensuring consistent handling and storage requirements across the substitution group.

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