LED RED DIFFUSED T-1 3/4 T/H 4304S1 Equivalent & Substitute Parts

Part Overview

The VCC 4304S1 is a red diffused LED indicator in T-1 3/4 (5mm) through-hole package designed for discrete red light indication applications. This component operates at 1.9V forward voltage with a 7mcd brightness rating and 50° viewing angle. The product is classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing design support and production continuity. The 4304S1 remains in stock inventory with 731 units available as new original components.

Substiute Parts

4304S1

Visual Communications Company - VCCIn Stock: 8114304S1 Datasheet

Current PartRFQ

WP63ID

KingbrightIn Stock: 8720WP63ID Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete 4304S1 is determined by strict alignment of the following critical parameters:

Physical & Mechanical Compatibility:

• Lens size: 5mm, T-1 3/4 form factor
• Mounting type: Through-hole radial configuration
• Lens style: Round with domed top
• Lens color and transparency: Red diffused

Electrical Operating Parameters:

• Color specification: Red
• Forward voltage range: Acceptable tolerance around 1.9V nominal
• Test current: Operational at or near 10mA
• Brightness rating: Millicandela output suitable for indication applications
• Viewing angle: Minimum 50° for general indication use

Regulatory & Environmental Compliance:

• RoHS3 compliance required
• REACH unaffected status
• Moisture sensitivity level 1 (unlimited shelf life)

The Kingbright WP63ID meets these substitution criteria as a functionally equivalent part with compatible physical dimensions, through-hole mounting, and regulatory compliance status.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: Kingbright WP63ID

The WP63ID is the qualified equivalent for the obsolete 4304S1 based on the following engineering criteria:

Mechanical Compatibility: Both components share identical 5mm T-1 3/4 form factor, round domed lens geometry, and through-hole radial mounting configuration. The WP63ID maximum height of 6.00mm versus 4304S1 at 5.33mm represents a 0.67mm difference; circuit board layout must accommodate this variance to ensure proper component seating and clearance.

Electrical Equivalence: Forward voltage specifications are within acceptable tolerance (1.9V versus 2V). The WP63ID operates at 20mA test current compared to the 4304S1 at 10mA, indicating higher current capability. The WP63ID brightness rating of 12mcd exceeds the 4304S1 at 7mcd, providing enhanced visibility. Peak wavelength variance of 8nm (635nm to 627nm) remains within the red spectrum and does not affect functional indication performance.

Regulatory Compliance: Both components maintain ROHS3 compliance, REACH unaffected status, and moisture sensitivity level 1 (unlimited shelf life), ensuring equivalent environmental and regulatory standing.

Product Lifecycle: The WP63ID maintains active product status with current manufacturing support and 8658 units in stock inventory, providing supply continuity for the obsolete 4304S1.

Design Consideration: Circuit designs operating the 4304S1 at 10mA test current will function with the WP63ID without modification. The higher brightness output of the WP63ID may require current limiting resistor adjustment if visual intensity must match the original 7mcd specification exactly.

Frequently Asked Questions (FAQ)

Q: Can the Kingbright WP63ID directly replace the VCC 4304S1 without PCB modifications?

A: The WP63ID is mechanically and electrically compatible for direct through-hole mounting. The 0.67mm height difference (6.00mm versus 5.33mm) must be verified against PCB clearance requirements. No circuit modifications are required for standard indication applications.

Q: What is the impact of the 0.1V forward voltage difference between 4304S1 (1.9V) and WP63ID (2V)?

A: The 0.1V variance falls within typical LED forward voltage tolerance and does not require circuit redesign. Current limiting resistor values calculated for 1.9V will function correctly with 2V forward voltage in standard indicator applications.

Q: The WP63ID has 12mcd brightness versus 4304S1 at 7mcd. Will this cause design issues?

A: The higher brightness is generally beneficial for visibility. If the original design requires exact 7mcd output, current limiting resistor values must be recalculated to reduce operating current below 20mA test specification. Consult the WP63ID datasheet for brightness versus current characteristics.

Q: Are there wavelength compatibility concerns between 635nm (4304S1) and 627nm (WP63ID)?

A: Both wavelengths are within the red spectrum and visually indistinguishable for human perception in indication applications. The 8nm difference does not affect functional performance or color matching in standard LED indicator circuits.

Q: What is the viewing angle difference between 50° (4304S1) and 60° (WP63ID)?

A: The WP63ID provides a 10° wider viewing angle, improving visibility from off-axis positions. This is advantageous for indicator applications and does not create compatibility issues.

Q: Is the WP63ID available in the same packaging as the 4304S1?

A: Both components use T-1 3/4 (5mm) through-hole radial packages. The WP63ID is supplied in bulk packaging, while the 4304S1 was supplied in standard packaging. Component form factor and mounting are identical.

Q: What compliance certifications apply to the WP63ID as a substitute?

A: The WP63ID maintains ROHS3 compliance and REACH unaffected status, matching the 4304S1 regulatory profile. Moisture sensitivity level 1 (unlimited) ensures equivalent environmental performance.

Q: Why is the 4304S1 classified as obsolete?

A: The 4304S1 is no longer manufactured by VCC. The Kingbright WP63ID serves as the active production equivalent, ensuring continued availability and supply chain support for this LED indicator specification.

Q: Can the WP63ID be used in high-reliability or military applications?

A: Substitution decisions for high-reliability applications must be based on specific qualification requirements and design standards. The WP63ID is an active commercial component; military or aerospace applications require formal qualification procedures beyond standard equivalence criteria.