WP937IID Red Diffused T-1 LED Equivalent & Substitute Parts

Part Overview

The WP937IID is an active red diffused T-1 through-hole LED manufactured by Kingbright, designed for indication applications. This component features a 617nm dominant wavelength with 4mcd luminous intensity and operates at 2V forward voltage with a 20mA test current. The part is RoHS3 compliant and maintains unlimited moisture sensitivity rating (MSL 1). Finding equivalent substitute parts is necessary to ensure supply chain continuity, manage inventory optimization, and maintain design flexibility across production batches.

Substiute Parts

WP937IID

KingbrightIn Stock: 1603WP937IID Datasheet

Current PartRFQ

HLMP-1301

Broadcom LimitedIn Stock: 2275HLMP-1301 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the WP937IID are identified based on strict alignment with the following critical parameters:

Mechanical Compatibility:

• Lens size: 3mm, T-1 form factor
• Mounting type: Through hole radial configuration
• Lens style: Round with domed top
• Lens transparency: Diffused

Electrical Compatibility:

• Color: Red spectrum indication
• Wavelength range: 617nm–627nm dominant wavelength
• Forward voltage: 1.9V–2V typical
• Test current: 10mA–20mA
• Viewing angle: 60°

Regulatory & Environmental:

• RoHS3 compliance
• MSL 1 (unlimited moisture sensitivity)
• REACH unaffected status
• ECCN EAR99 classification

The HLMP-1301 from Broadcom Limited qualifies as a direct substitute based on matching mechanical form factor, red diffused lens configuration, compatible electrical parameters within acceptable tolerance, and identical regulatory compliance status.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection (WP937IID): The WP937IID remains the primary choice for new designs and existing production runs. Active product status, established supply chain (1532 pcs in stock), and specified electrical parameters provide baseline design reference.

Substitute Selection (HLMP-1301): The HLMP-1301 is suitable for substitution when WP937IID availability is constrained. Both parts maintain identical RoHS3 compliance and REACH unaffected status, ensuring regulatory continuity. The 0.1V forward voltage variance (2V vs. 1.9V) and 0.6mcd luminous intensity difference are within acceptable tolerance for indication-class LED applications. The 9nm wavelength shift (617nm to 626nm) remains within the red spectrum and does not affect functional performance in standard indication circuits.

Inventory Status: HLMP-1301 maintains higher stock availability (2200 pcs) compared to WP937IID (1532 pcs), supporting supply chain resilience.

Frequently Asked Questions (FAQ)

Q: Can HLMP-1301 be used as a direct drop-in replacement for WP937IID?

A: Yes, for indication applications. Both parts share identical mechanical form factor (3mm T-1 through-hole radial), lens configuration (diffused red), viewing angle (60°), and regulatory compliance (RoHS3). Electrical parameters are within acceptable tolerance for indication circuits.

Q: What is the significance of the 0.1V forward voltage difference?

A: The WP937IID operates at 2V typical while HLMP-1301 operates at 1.9V typical. This 0.1V variance is negligible in most indication circuit designs using current-limiting resistors. Circuit designers should verify that existing resistor values accommodate the lower forward voltage without exceeding maximum rated current.

Q: Does the 0.6mcd luminous intensity difference affect visibility?

A: The WP937IID provides 4mcd while HLMP-1301 provides 3.4mcd. For indication applications, this 15% difference is typically imperceptible to human vision. Applications requiring specific brightness levels should conduct visual assessment under target operating conditions.

Q: Are the wavelength specifications interchangeable?

A: The WP937IID dominant wavelength is 617nm (peak 627nm) while HLMP-1301 is 626nm (peak 635nm). Both fall within the red spectrum and produce visually identical red indication. The 9nm shift does not affect functional performance in standard indication circuits.

Q: What are the height differences between these parts?

A: WP937IID maximum height is 5.60mm; HLMP-1301 maximum height is 6.35mm. This 0.75mm difference must be evaluated for PCB layout clearance and mechanical constraints in confined spaces.

Q: Are both parts suitable for high-volume production?

A: Yes. Both WP937IID and HLMP-1301 maintain active product status with established manufacturing processes. HLMP-1301 offers higher current inventory (2200 pcs vs. 1532 pcs), supporting sustained production requirements.

Q: Do regulatory certifications differ between these parts?

A: No. Both parts are RoHS3 compliant, REACH unaffected, and classified as ECCN EAR99. Regulatory documentation requirements are identical for either part.