WP908A8GD Green Diffused T-1 LED Equivalent & Substitute Parts

Part Overview

The WP908A8GD is a green diffused T-1 through-hole LED manufactured by Kingbright, designed for discrete LED indication applications. This component features a 568nm dominant wavelength, 2.2V forward voltage, and 25mcd brightness rating in a 3mm radial package. The part maintains Active product status with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Equivalent and substitute parts are identified based on matching mechanical form factor, optical characteristics, and electrical operating parameters within acceptable tolerance ranges for LED indication circuits. Substitution becomes necessary when the primary part reaches end-of-life status, inventory constraints occur, or design flexibility is required across multiple voltage supply rails.

Key Parameters

Parameter	Value	Unit	Substitution Relevance
Lens Size	3mm, T-1	-	Critical - Mechanical compatibility with PCB footprint
Lens Transparency	Diffused	-	Critical - Optical performance and viewing characteristics
Color	Green	-	Critical - Wavelength specification for indication function
Mounting Type	Through Hole	-	Critical - PCB assembly compatibility
Voltage - Forward (Vf)	2.2V	V	Important - Circuit design and current limiting resistor selection
Current - Test	20mA	mA	Important - Power supply and resistor network design
Millicandela Rating	25mcd	mcd	Important - Brightness and visibility requirements
Viewing Angle	80°	degrees	Important - Application-specific visibility envelope
Wavelength - Peak	565nm	nm	Important - Color consistency and optical filtering
Package / Case	Radial	-	Critical - Lead configuration and PCB routing
RoHS Status	ROHS3 Compliant	-	Important - Regulatory compliance requirement

Substitute Part Grouping Explanation

Substitute parts for the WP908A8GD are grouped based on strict adherence to the following substitution criteria:

Mechanical Compatibility Requirements:

Lens size must be 3mm, T-1 form factor
Mounting type must be through-hole (radial or right-angle lead configuration)
Package case must be radial or compatible through-hole variant

Optical Compatibility Requirements:

Color must be green
Lens transparency must be diffused
Peak wavelength must be within the 565nm specification band
Dominant wavelength must be in the green spectrum (565-569nm range)

Electrical Operating Parameters:

Forward voltage (Vf) tolerance: Substitutes operating at 1.9V to 12V are acceptable when circuit design accommodates voltage variation through appropriate current-limiting resistor selection
Test current: Substitutes rated at 2mA to 20mA are acceptable; circuit design must account for brightness variation
Millicandela rating: Substitutes ranging from 1.6mcd to 40mcd are acceptable; brightness differences are application-dependent

Regulatory and Compliance Requirements:

RoHS3 compliance is mandatory
MSL 1 (Unlimited) rating is standard across all qualified substitutes
ECCN EAR99 classification applies uniformly

Substitutes are organized into voltage-based groupings (1.9V, 2.1V, 2.2V, 5V, 12V) to facilitate circuit-specific selection while maintaining mechanical and optical interchangeability.

Parameter Comparison

Part Number	Manufacturer	Color	Lens Size	Lens Transparency	Vf (Typ)	Current - Test	mcd Rating	Viewing Angle	Wavelength - Peak	Mounting Type	Height (Max)	RoHS Status
WP908A8GD	Kingbright	Green	3mm, T-1	Diffused	2.2V	20mA	25mcd	80°	565nm	Through Hole	5.50mm	ROHS3
HLMP-1640	Broadcom Limited	Green	3mm, T-1	Diffused	5V	10mA	1.6mcd	60°	565nm	Through Hole	6.35mm	ROHS3
HLMP-1640-B00A1	Broadcom Limited	Green	3mm, T-1	Diffused, Tinted	5V	10mA	1.6mcd	120°	565nm	Through Hole, Right Angle	-	ROHS3
HLMP-1640-B00A2	Broadcom Limited	Green	3mm, T-1	Diffused, Tinted	5V	10mA	1.6mcd	60°	565nm	Through Hole, Right Angle	-	ROHS3
HLMP-1641	Broadcom Limited	Green	3mm, T-1	Diffused	12V	13mA	1.6mcd	60°	565nm	Through Hole	6.35mm	ROHS3
HLMP-1790	Broadcom Limited	Green	3mm, T-1	Diffused	1.9V	2mA	2.3mcd	50°	565nm	Through Hole	6.35mm	ROHS3
HLMP-1790-A0002	Broadcom Limited	Green	3mm, T-1	Diffused	1.9V	2mA	2.3mcd	50°	565nm	Through Hole	6.35mm	ROHS3
LTL-4231	Lite-On Inc.	Green	3mm, T-1	Diffused	2.1V	10mA	12.6mcd	40°	565nm	Through Hole	6.55mm	ROHS3
SSL-LX3044GD	Lumex Opto/Components Inc.	Green	3mm, T-1	Diffused	2.2V	20mA	40mcd	60°	565nm	Through Hole	4.60mm	ROHS3
SSL-LX3044GD-5V	Lumex Opto/Components Inc.	Green	3mm, T-1	Diffused	5V	-	6mcd	60°	565nm	Through Hole	4.60mm	ROHS3
SSL-LX3044GD-12V	Lumex Opto/Components Inc.	Green	3mm, T-1	Diffused	12V	-	6mcd	60°	565nm	Through Hole	4.60mm	ROHS3

Engineering Selection Recommendations

Direct Electrical Equivalent (Preferred for Drop-In Replacement):

SSL-LX3044GD is the optimal direct substitute for WP908A8GD. Both components share identical forward voltage (2.2V), test current (20mA), and peak wavelength (565nm) specifications. The SSL-LX3044GD offers superior brightness (40mcd versus 25mcd) while maintaining the same mechanical form factor and through-hole radial mounting configuration. Height difference (4.60mm versus 5.50mm) is within acceptable PCB assembly tolerances. Both parts maintain ROHS3 compliance and MSL 1 rating.

Voltage-Specific Substitutes:

For 5V supply rail applications: HLMP-1640 or SSL-LX3044GD-5V provide green diffused T-1 LEDs with 5V forward voltage rating. HLMP-1640 operates at 10mA test current with 1.6mcd brightness. SSL-LX3044GD-5V operates at 6mcd brightness. Both require circuit redesign to accommodate 5V operation.

For 12V supply rail applications: HLMP-1641 or SSL-LX3044GD-12V provide green diffused T-1 LEDs with 12V forward voltage rating. HLMP-1641 operates at 13mA test current with 1.6mcd brightness. SSL-LX3044GD-12V operates at 6mcd brightness. Both require circuit redesign to accommodate 12V operation.

For low-voltage applications (1.9V): HLMP-1790 and HLMP-1790-A0002 provide green diffused T-1 LEDs with 1.9V forward voltage and 2mA test current. These parts are suitable for battery-powered or low-power indication circuits.

Brightness-Optimized Substitute:

LTL-4231 (Lite-On Inc.) provides 12.6mcd brightness at 2.1V forward voltage and 10mA test current, offering moderate brightness enhancement over the WP908A8GD while maintaining similar electrical operating parameters. REACH Status is REACH Affected (versus REACH Unaffected for primary part); verify regulatory requirements before selection.

Right-Angle Configuration Options:

HLMP-1640-B00A1 and HLMP-1640-B00A2 provide right-angle through-hole mounting variants of the HLMP-1640 base part. These are suitable only when PCB layout requires perpendicular lead orientation. Both operate at 5V with 10mA test current and 1.6mcd brightness.

Compliance and Regulatory Status:

All listed substitutes maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating. ECCN EAR99 classification applies uniformly. LTL-4231 is REACH Affected; all other substitutes are REACH Unaffected. Verify REACH compliance requirements for end-use application before final part selection.

Frequently Asked Questions (FAQ)

Q: Can SSL-LX3044GD replace WP908A8GD in existing circuit designs without modification?

A: Yes. SSL-LX3044GD is a direct electrical and mechanical equivalent. Both components operate at 2.2V forward voltage and 20mA test current. The 4.60mm height (versus 5.50mm) is within standard PCB assembly tolerances. No circuit redesign is required.

Q: What is the primary difference between HLMP-1640 and WP908A8GD?

A: HLMP-1640 operates at 5V forward voltage and 10mA test current, compared to WP908A8GD at 2.2V and 20mA. HLMP-1640 also provides lower brightness (1.6mcd versus 25mcd). Circuit redesign is required to accommodate the higher voltage and lower current specifications. HLMP-1640 is suitable only for 5V supply rail applications.

Q: Are right-angle variants (HLMP-1640-B00A1, HLMP-1640-B00A2) mechanically compatible with radial footprints?

A: No. Right-angle variants feature perpendicular lead orientation and are not compatible with standard radial through-hole footprints. These parts are suitable only when PCB layout specifically requires right-angle lead configuration. Use radial variants (HLMP-1640, HLMP-1641, HLMP-1790) for standard through-hole footprints.

Q: What is the brightness difference between WP908A8GD (25mcd) and SSL-LX3044GD (40mcd)?

A: SSL-LX3044GD provides 60% higher brightness (40mcd versus 25mcd) while maintaining identical electrical operating parameters (2.2V, 20mA). This brightness enhancement may be visible in applications requiring high-contrast indication. If reduced brightness is required, LTL-4231 (12.6mcd) or HLMP-1790 (2.3mcd) provide lower brightness alternatives.

Q: Can HLMP-1790 or HLMP-1790-A0002 be used as direct replacements?

A: HLMP-1790 and HLMP-1790-A0002 are not direct replacements. Both operate at 1.9V forward voltage and 2mA test current (versus 2.2V and 20mA for WP908A8GD). These parts are suitable only for low-power or battery-powered applications where reduced current consumption is required. Circuit redesign is necessary.

Q: What is the difference between HLMP-1790 (Bulk packaging) and HLMP-1790-A0002 (Cut Tape packaging)?

A: Both parts are electrically and mechanically identical. The difference is packaging format only. HLMP-1790 is supplied in Bulk packaging; HLMP-1790-A0002 is supplied in Cut Tape (CT) packaging. Select based on assembly process requirements (manual assembly typically uses Bulk; automated assembly typically uses Cut Tape).

Q: Is LTL-4231 suitable for applications requiring REACH compliance?

A: LTL-4231 is REACH Affected, whereas WP908A8GD and most other substitutes are REACH Unaffected. Verify REACH compliance requirements for your end-use application and geographic market before selecting LTL-4231. If REACH Unaffected status is mandatory, use SSL-LX3044GD, HLMP series, or HLMP-1790 variants.

Q: What viewing angle differences exist among substitutes?

A: WP908A8GD provides 80° viewing angle. Substitutes range from 40° (LTL-4231) to 120° (HLMP-1640-B00A1). Narrower viewing angles (40-60°) concentrate brightness in a specific direction; wider angles (80-120°) distribute brightness across a broader viewing envelope. Select based on application-specific visibility requirements.

Q: Are all substitutes compatible with standard LED current-limiting resistor networks?

A: No. Substitutes operating at different forward voltages (1.9V, 2.1V, 5V, 12V) require different resistor values to achieve equivalent brightness and current limiting. Use the formula: R = (Vsupply - Vf) / Iled. Recalculate resistor values for each substitute based on its specific forward voltage and desired operating current.

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