SLR-332YY3F Yellow LED T-1 Through Hole Equivalent & Substitute Parts

Part Overview

The SLR-332YY3F is an active yellow diffused LED indicator from Rohm Semiconductor, designed for discrete indication applications in through-hole mounting configurations. This T-1 package component operates at 2.1V forward voltage with a 587nm dominant wavelength and 6.3mcd brightness rating. The part is ROHS3 compliant and maintains unlimited moisture sensitivity rating (MSL 1), making it suitable for standard industrial and consumer applications. Substitute parts are identified based on matching electrical characteristics, mechanical compatibility, and regulatory compliance to ensure functional equivalence in circuit designs.

Key Parameters

Parameter	Value
Manufacturer Part Number	SLR-332YY3F
Manufacturer	Rohm Semiconductor
Color	Yellow
Lens Transparency	Diffused
Mounting Type	Through Hole
Package / Case	Radial
Supplier Device Package	T-1
Voltage - Forward (Vf) (Typ)	2.1V
Current - Test	10mA
Wavelength - Dominant	587nm
Millicandela Rating	6.3mcd
Lens Size	3.20mm Dia
Height (Max)	4.60mm
Viewing Angle	85°
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the SLR-332YY3F are grouped based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

Color: Yellow
Lens Transparency: Diffused
Mounting Type: Through Hole
Package / Case: Radial (T-1 or 3mm Round)
Voltage - Forward (Vf): 2.1V (primary group)
RoHS Status: ROHS3 Compliant

Secondary Considerations:

Wavelength range: 585nm to 590nm (yellow spectrum)
Millicandela rating: Brightness variations acceptable within application tolerance
Viewing angle: 40° to 85° (application-dependent)
Height: Maximum 6.55mm (PCB clearance consideration)

Parts are classified as direct substitutes when forward voltage, color, lens type, and mounting configuration match the SLR-332YY3F specifications. Variations in brightness (mcd), viewing angle, and height are acceptable provided the application circuit design accommodates these differences.

Parameter Comparison

Part Number	Manufacturer	Color	Vf (Typ)	Current - Test	Wavelength - Dominant	mcd Rating	Lens Size	Height (Max)	Viewing Angle	RoHS Status	Inventory
SLR-332YY3F	Rohm Semiconductor	Yellow	2.1V	10mA	587nm	6.3mcd	3.20mm Dia	4.60mm	85°	ROHS3	2586 Pcs
151031YS05900	Würth Elektronik	Yellow	2.1V	20mA	590nm	30mcd	3.00mm Dia	5.55mm	60°	ROHS3	1343 Pcs
LTL-4251	Lite-On Inc.	Yellow	2.1V	10mA	588nm	8.7mcd	3mm, T-1	6.55mm	40°	ROHS3	7627 Pcs
LTL-4251N	Lite-On Inc.	Yellow	2.1V	10mA	588nm	5.6mcd	3mm, T-1	5.85mm	60°	ROHS3	32761 Pcs
SSL-LX3044LYD	Lumex Opto/Components Inc.	Yellow	2.1V	20mA	—	30mcd	3mm, T-1	4.60mm	60°	ROHS3	13200 Pcs
SSL-LX3044YD	Lumex Opto/Components Inc.	Yellow	2.1V	20mA	—	15mcd	3mm, T-1	4.60mm	40°	ROHS3	16372 Pcs
HLMP-1719	Broadcom Limited	Yellow	1.8V	2mA	585nm	2.1mcd	3mm, T-1	6.35mm	50°	ROHS3	21200 Pcs
HLMP-1719-A0002	Broadcom Limited	Yellow	1.8V	2mA	585nm	2.1mcd	3mm, T-1	6.35mm	50°	ROHS3	4673 Pcs
HLMP-1620	Broadcom Limited	Yellow	5V	10mA	585nm	2.2mcd	3mm, T-1	6.35mm	60°	ROHS3	12068 Pcs
HLMP-1621	Broadcom Limited	Yellow	12V	13mA	585nm	2.2mcd	3mm, T-1	6.35mm	60°	ROHS3	16474 Pcs
SSL-LX3044YD-12V	Lumex Opto/Components Inc.	Yellow	12V	—	—	6mcd	3mm, T-1	4.60mm	60°	ROHS3	3207 Pcs

Engineering Selection Recommendations

Direct Substitutes (2.1V Forward Voltage Group):

The following parts are direct substitutes for the SLR-332YY3F based on matching 2.1V forward voltage specification:

LTL-4251N (Lite-On Inc.): Closest match with identical 2.1V Vf, 10mA test current, and ROHS3 compliance. Brightness (5.6mcd) is comparable to the main part. Highest inventory availability (32,761 pcs) ensures supply continuity.
SSL-LX3044YD (Lumex Opto/Components Inc.): Matches 2.1V Vf and ROHS3 compliance. Higher brightness (15mcd) and 20mA test current require circuit verification for current-limiting resistor adjustment. Compact height (4.60mm) matches the main part.
LTL-4251 (Lite-On Inc.): Meets 2.1V Vf and 10mA test current. Brightness (8.7mcd) is within acceptable range. REACH Affected status requires compliance verification in regulated markets.
151031YS05900 (Würth Elektronik): Matches 2.1V Vf and ROHS3 compliance. Higher brightness (30mcd) and 20mA test current require circuit design accommodation. Wavelength (590nm) is within yellow spectrum tolerance.
SSL-LX3044LYD (Lumex Opto/Components Inc.): Matches 2.1V Vf and ROHS3 compliance. Brightness (30mcd) and 20mA test current require circuit verification. Identical height (4.60mm) to main part.

Alternative Voltage Groups (Not Direct Substitutes):

HLMP-1719 / HLMP-1719-A0002 (Broadcom Limited): 1.8V forward voltage requires circuit redesign. Lower brightness (2.1mcd) and 2mA test current suitable only for low-power indicator applications. ROHS3 compliant.
HLMP-1620 (Broadcom Limited): 5V forward voltage requires circuit redesign. Lower brightness (2.2mcd) suitable for high-voltage indicator circuits. ROHS3 compliant.
HLMP-1621 (Broadcom Limited): 12V forward voltage requires circuit redesign. Lower brightness (2.2mcd) suitable for 12V system indicators. ROHS3 compliant.
SSL-LX3044YD-12V (Lumex Opto/Components Inc.): 12V forward voltage requires circuit redesign. Compact height (4.60mm) and ROHS3 compliance noted. Suitable for 12V indicator applications only.

All substitute parts maintain ROHS3 compliance and MSL 1 (unlimited) moisture sensitivity rating, ensuring regulatory equivalence with the main part.

Frequently Asked Questions (FAQ)

Q: Can I use LTL-4251N as a direct replacement for SLR-332YY3F without circuit modification?

A: Yes. LTL-4251N matches the critical parameters: 2.1V forward voltage, 10mA test current, yellow diffused lens, T-1 through-hole package, and ROHS3 compliance. No circuit modification is required. Brightness difference (5.6mcd vs. 6.3mcd) is within acceptable tolerance for most indicator applications.

Q: What is the difference between SSL-LX3044LYD and SSL-LX3044YD?

A: Both parts share identical electrical specifications (2.1V Vf, ROHS3 compliance, T-1 package, 4.60mm height). The primary difference is brightness: SSL-LX3044LYD provides 30mcd while SSL-LX3044YD provides 15mcd. Selection depends on required brightness level. Both require 20mA test current, necessitating circuit verification against the original 10mA specification.

Q: Can I substitute HLMP-1620 (5V) for the SLR-332YY3F (2.1V)?

A: No. HLMP-1620 operates at 5V forward voltage and requires complete circuit redesign. The current-limiting resistor value must be recalculated based on the new voltage specification. This is not a direct substitute and introduces design risk.

Q: Why do some substitute parts have higher brightness (mcd) ratings?

A: Brightness variation is acceptable within the substitute group provided the application circuit design accommodates the difference. Higher brightness parts (30mcd) may require adjusted current-limiting resistor values or circuit verification to prevent over-driving the LED. Lower brightness parts (2.1mcd) are suitable only for applications where reduced brightness is acceptable.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance, ensuring regulatory equivalence with the SLR-332YY3F. LTL-4251 carries REACH Affected status, requiring compliance verification in regulated markets; all other parts are REACH Unaffected.

Q: What is the significance of the T-1 package designation?

A: T-1 is a standard through-hole LED package with 3mm lens diameter and radial leads. All substitute parts listed use T-1 or equivalent 3mm round packages, ensuring mechanical compatibility with PCB footprints designed for the SLR-332YY3F. Height variations (4.60mm to 6.55mm) are within typical PCB clearance tolerances.

Q: Can I use HLMP-1719 (1.8V) in a 2.1V circuit?

A: No. HLMP-1719 operates at 1.8V forward voltage and is not a direct substitute. Using it in a 2.1V circuit would require circuit redesign. This part is suitable only for dedicated low-voltage indicator applications.

Q: Which substitute part has the highest inventory availability?

A: LTL-4251N (Lite-On Inc.) has the highest inventory with 32,761 pcs in stock, followed by HLMP-1719 (21,200 pcs) and HLMP-1621 (16,474 pcs). For 2.1V direct substitutes, LTL-4251N offers the best supply continuity.

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