3YD LED Yellow Diffused T-1 Through Hole

Part Overview

The 3YD is a yellow diffused T-1 through hole LED manufactured by Bivar Inc., designed for discrete indication applications. This part operates at 2V forward voltage with a 20mcd brightness rating and features a 40° viewing angle. The product status is obsolete, which necessitates the identification of equivalent and substitute components that maintain functional compatibility while offering improved availability and product support. Substitute components are identified based on matching core electrical and mechanical parameters: yellow color, diffused lens, through hole mounting, 3mm package size, 2V nominal forward voltage, and 20mA test current operation.

Key Parameters

Parameter	Specification
Manufacturer Part Number	3YD
Manufacturer	Bivar Inc.
Product Status	Obsolete
Color	Yellow
Lens Transparency	Diffused
Lens Size	3mm, T-1
Voltage - Forward (Vf) (Typ)	2V
Current - Test	20mA
Millicandela Rating	20mcd
Mounting Type	Through Hole
Wavelength - Peak	590nm
Viewing Angle	40°
Package / Case	Radial
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution analysis is based on the following key parameters that determine functional equivalency:

Primary Compatibility Criteria:

Color: Yellow
Lens Transparency: Diffused
Mounting Type: Through Hole
Package Size: 3mm or 3.0mm Dia
Forward Voltage (Vf): 2V ±0.1V nominal range
Test Current: 20mA operation
Wavelength: 585-591nm range (yellow spectrum)

Secondary Selection Factors:

Millicandela Rating: 20mcd baseline (substitutes may vary ±20% without affecting indication function)
Viewing Angle: 40° minimum (wider angles acceptable)
Height: Physical envelope compatibility with circuit board layout
Product Status: Active products preferred over obsolete stock

Substitute parts are grouped according to compliance with these parameters. Parts with forward voltage ratings of 2V at 20mA test current are directly interchangeable. Parts with alternative voltage ratings (5V, 12V, 1.8V) require circuit design modification for proper current limiting and are listed as secondary options for applications with different power supply architectures.

Parameter Comparison

Parameter	3YD (Bivar)	1254-10UYD/S530-A3 (Everlight)	151031YS05900 (Würth)	264-7UYD/S530-A3 (Everlight)	414-10UYD/S530-A3 (Everlight)	HLMP-1620 (Broadcom)	HLMP-1621 (Broadcom)	HLMP-1719 (Broadcom)
Color	Yellow	Yellow	Yellow	Yellow	Yellow	Yellow	Yellow	Yellow
Lens Transparency	Diffused	Diffused	Diffused	Diffused	Diffused	Diffused	Diffused	Diffused
Lens Size	3mm, T-1	3.00mm Dia	3.00mm Dia	2.90mm Dia	3.00mm Dia	3mm, T-1	3mm, T-1	3mm, T-1
Voltage - Forward (Vf) (Typ)	2V	2V	2.1V	2V	2V	5V	12V	1.8V
Current - Test	20mA	20mA	20mA	20mA	20mA	10mA	13mA	2mA
Millicandela Rating	20mcd	200mcd	30mcd	125mcd	40mcd	2.2mcd	2.2mcd	2.1mcd
Viewing Angle	40°	30°	60°	60°	120°	60°	60°	50°
Wavelength - Peak	590nm	591nm	585nm	591nm	591nm	583nm	583nm	-
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Height (Max)	4.50mm	5.20mm	5.55mm	6.20mm	7.00mm	6.35mm	6.35mm	6.35mm
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active
RoHS Status	-	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	-	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Direct Electrical Compatibility):

For applications requiring 2V forward voltage operation at 20mA test current, the following active products provide direct substitution without circuit modification:

1254-10UYD/S530-A3 (Everlight Electronics): Maintains 2V/20mA characteristics with higher brightness (200mcd). Suitable for applications where increased visibility is beneficial. Bulk packaging. ROHS3 compliant.
151031YS05900 (Würth Elektronik): Operates at 2.1V/20mA with 30mcd brightness. Series designation WL-TMRC. Active product status with ROHS3 compliance and REACH unaffected certification. Supports long-term design continuity.
264-7UYD/S530-A3 (Everlight Electronics): 2V/20mA operation with 125mcd output. Lens diameter 2.90mm. Wider 60° viewing angle. ROHS3 compliant.
414-10UYD/S530-A3 (Everlight Electronics): 2V/20mA rating with 40mcd brightness and 120° wide viewing angle. Flat-top lens style. Tape & Reel packaging for production environments. Height 7.00mm clearance requirement.

Secondary Substitutes (Voltage Rating Modification Required):

The following components require circuit design changes for proper current limiting operation:

HLMP-1620 (Broadcom Limited): 5V forward voltage. Brightness 2.2mcd at 10mA test. T-1 package. ROHS3 compliant with REACH unaffected status. High inventory availability (12,068 pcs). Requires series resistor adjustment for 5V supply compatibility.
HLMP-1621 (Broadcom Limited): 12V forward voltage. 2.2mcd brightness at 13mA test. ROHS3 and REACH compliant. For 12V system architectures.
HLMP-1719 (Broadcom Limited): Low-voltage option at 1.8V forward voltage. 2.1mcd at 2mA test current. ROHS3 and REACH compliant. Suitable for battery-powered or low-voltage digital logic applications.

All recommended substitutes share: yellow color, diffused lens, through hole radial mounting, T-1 or 3mm package size designation, and unlimited moisture sensitivity rating. Product status is active for all alternatives, eliminating obsolescence risk.

Frequently Asked Questions (FAQ)

Q: Can I directly replace the 3YD with any of the primary substitute parts without circuit modification?

A: Yes. The parts listed under "Primary Substitutes" maintain the 2V forward voltage and 20mA test current specification of the original 3YD. Direct pin-for-pin substitution is supported. Secondary substitutes with different voltage ratings require circuit redesign of current-limiting resistor networks.

Q: How does brightness (millicandela rating) affect substitution compatibility?

A: Brightness differences up to ±20% from the original 20mcd rating do not affect functional compatibility for standard indication applications. Higher-brightness substitutes (200mcd, 125mcd, 40mcd options) provide improved visibility without electrical incompatibility. Lower-brightness Broadcom alternatives (2.2mcd) reduce visibility but maintain circuit compatibility when voltage differences are accommodated.

Q: What is the significance of the viewing angle parameter in selecting a substitute?

A: Viewing angle determines the observation cone for adequate brightness perception. The original 3YD specifies 40°. Substitutes with 60° or 120° viewing angles provide wider observation zones and are suitable for general indication applications. Narrower 30° angles (1254-10UYD) limit acceptable viewing positions and are suitable only when directional indication is desired.

Q: Are the Everlight and Broadcom substitutes compatible with the same PCB design layout?

A: Compatibility depends on height clearance. The original 3YD has 4.50mm maximum height. Everlight substitutes range from 5.20mm to 7.00mm. Broadcom alternatives are 6.35mm maximum. Verify available board space before component selection. Width and pin spacing are standardized for T-1 and 3mm packages and are compatible.

Q: What is the difference between Bulk and Tape & Reel packaging options?

A: Bulk packaging (typical for low-volume or prototype applications) supplies loose components in standard quantities. Tape & Reel (TR) packaging provides components on continuous carrier tape suitable for automated pick-and-place assembly equipment. The 414-10UYD/S530-A3 is available in Tape & Reel format, supporting production environments. Electrical characteristics are identical.

Q: Why are ROHS3 compliance and REACH certification important for substitution?

A: ROHS3 (Restriction of Hazardous Substances Directive 3) and REACH (Registration, Evaluation, Authorisation and Restriction of Chemicals) compliance ensure environmental and regulatory conformance for product distribution and use in regulated markets. All active substitute components demonstrate ROHS3 compliance. Würth Elektronik and Broadcom alternatives explicitly list REACH unaffected status, supporting unrestricted deployment in applications subject to EU regulations.

Q: Can I use the HLMP-1719 (1.8V) in a 2V circuit design without modification?

A: No. The HLMP-1719 forward voltage of 1.8V differs from the 3YD specification of 2V. Use in a 2V circuit will produce overcurrent conditions and shortened component life. The HLMP-1719 is designated for 1.8V supply architectures only and requires circuit design verification before implementation.

Q: How do wavelength specifications affect color matching in indication applications?

A: All substitutes maintain yellow color classification within the 585-591nm wavelength range. Peak wavelength variations within this range produce no perceptible color difference under standard lighting conditions. The 3YD (590nm peak) and all primary substitutes (585-591nm range) are color-matched for visual indication consistency.

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