H310CHD LED Circuit Board Indicator Equivalent & Substitute Parts

Part Overview

The H310CHD is a 3mm LED circuit board indicator manufactured by Bivar Inc., configured as a 3-high red LED assembly with diffused lens. This component is classified as obsolete, making substitute part identification essential for ongoing production and maintenance applications. The H310CHD operates at 2V with 20mA current rating and delivers 30mcd brightness with a 35° viewing angle. Due to its obsolete status, equivalent active production parts are required to maintain design continuity and supply chain reliability.

Substiute Parts

H310CHD

Bivar Inc.In Stock: 1084H310CHD Datasheet

Current PartRFQ

WP934RZ/3ID

KingbrightIn Stock: 1252WP934RZ/3ID Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute part identification for the H310CHD is based on the following critical parameters that define functional and mechanical compatibility:

Primary Compatibility Criteria:

• Lens size: 3mm, T-1 form factor
• Configuration: 3-high assembly structure
• Color: Red (x 3) optical output
• Lens type: Diffused light distribution
• Voltage rating: 2V operating voltage
• Millicandela rating: 30mcd minimum brightness
• Wavelength range: 625nm ± tolerance for red spectrum

Secondary Compatibility Parameters:

• Current rating: 20mA nominal (tolerance range acceptable)
• Viewing angle: 35° minimum (wider angles acceptable)
• Lens style: Round with domed top geometry
• Moisture sensitivity: MSL 1 (unlimited handling)

The WP934RZ/3ID from Kingbright meets these substitution criteria with allowable parameter variations within acceptable engineering tolerances for circuit board indicator applications.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: WP934RZ/3ID (Kingbright)

The WP934RZ/3ID qualifies as a direct substitute for the obsolete H310CHD based on the following engineering criteria:

1. Form Factor Compatibility: Both components share identical 3mm T-1 lens size and 3-high configuration, ensuring mechanical fit in existing circuit board layouts and connector interfaces.

2. Electrical Compatibility: The 2V voltage rating is identical. The WP934RZ/3ID current rating of 30mA exceeds the H310CHD specification of 20mA, providing operational margin within standard circuit board indicator design practices.

3. Optical Compatibility: Both components deliver 30mcd brightness with red (x 3) color output. The wavelength difference of 2nm (625nm vs. 627nm) remains within acceptable red spectrum tolerance for circuit board indicator applications. The WP934RZ/3ID features a tinted diffused lens, which is a compatible variant of the diffused lens type.

4. Viewing Angle: The WP934RZ/3ID provides 40° viewing angle compared to the H310CHD's 35°, representing an improvement in visibility range without functional degradation.

5. Product Status & Compliance: The WP934RZ/3ID is in active production status with ROHS3 compliance certification, ensuring long-term supply availability and alignment with current environmental regulations. The H310CHD obsolete status necessitates this substitution for ongoing procurement.

6. Environmental Handling: Both components share MSL 1 (unlimited) moisture sensitivity rating, requiring identical storage and handling protocols.

Selection Basis: This substitution is based exclusively on product status, compliance certifications, and the provided electrical and mechanical parameters. The WP934RZ/3ID maintains functional equivalence while offering improved availability and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can the WP934RZ/3ID directly replace the H310CHD in existing designs?

A: Yes. Both components share identical lens size (3mm T-1), configuration (3-high), color (red x 3), voltage rating (2V), and brightness (30mcd). The WP934RZ/3ID's 30mA current rating accommodates the H310CHD's 20mA specification. Physical and electrical compatibility is confirmed for direct substitution in circuit board indicator applications.

Q: What is the significance of the wavelength difference between 625nm and 627nm?

A: The 2nm difference falls within standard red spectrum tolerance for LED circuit board indicators. Both wavelengths produce visually identical red output for human perception in indicator applications. This variation does not affect functional compatibility.

Q: Does the tinted diffused lens of the WP934RZ/3ID differ functionally from the H310CHD's diffused lens?

A: The tinted variant is a compatible lens type variant. Tinting enhances color saturation and contrast in diffused lenses without altering the fundamental light distribution characteristic. For circuit board indicator applications, this represents an equivalent or improved optical performance.

Q: Why is the WP934RZ/3ID rated for 30mA when the H310CHD operates at 20mA?

A: The higher current rating indicates the component's maximum safe operating specification. Operating the WP934RZ/3ID at the H310CHD's 20mA level remains well within safe limits and is standard practice in component substitution. The higher rating provides design margin and does not affect compatibility.

Q: What is the impact of the 5° viewing angle difference (35° vs. 40°)?

A: The WP934RZ/3ID's wider 40° viewing angle provides improved visibility range compared to the H310CHD's 35°. This represents a performance enhancement with no negative compatibility impact for circuit board indicator applications.

Q: Are there any compliance or certification differences between these components?

A: The WP934RZ/3ID carries ROHS3 compliance certification, meeting current environmental regulatory requirements. The H310CHD's compliance status is not specified in available documentation. For new designs and ongoing procurement, the WP934RZ/3ID's active production status and current certifications ensure regulatory alignment.

Q: What is the packaging and mounting configuration for the WP934RZ/3ID?

A: The WP934RZ/3ID is specified as through-hole, right-angle mounting. Verify that existing circuit board layouts accommodate right-angle lead configuration if the original H310CHD used different lead geometry.

Q: Is the MSL 1 (unlimited) moisture sensitivity rating identical for both components?

A: Yes. Both the H310CHD and WP934RZ/3ID share MSL 1 (unlimited) classification, requiring identical storage, handling, and environmental control protocols throughout the supply chain and manufacturing process.