4308H1 Red LED T-1 3/4 Through Hole - Equivalent & Substitute Parts

Part Overview

The 4308H1 is a red LED indication component manufactured by Visual Communications Company (VCC) in a T-1 3/4 through-hole package. This discrete 1.8V radial LED features a 5mm clear domed lens with 240mcd brightness rating and 24° viewing angle, designed for standard indication applications. The part is currently obsolete, making equivalent substitutes necessary for ongoing production and maintenance requirements. Active alternatives from manufacturers including Everlight Electronics, Würth Elektronik, and CreeLED provide compatible replacements with maintained electrical and mechanical specifications.

Key Parameters

Parameter	4308H1 Specification
Manufacturer	Visual Communications Company (VCC)
Color	Red
Lens Size	5mm, T-1 3/4
Lens Style	Round with Domed Top
Lens Transparency	Clear
Voltage - Forward (Vf) Typical	1.8V
Current - Test	20mA
Millicandela Rating	240mcd
Viewing Angle	24°
Wavelength - Peak	645nm
Mounting Type	Through Hole
Package / Case	Radial
Height (Max)	9.19mm
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the 4308H1 is determined by the following critical parameters:

Primary Compatibility Criteria:

Color: Red
Mounting Type: Through Hole
Package Style: Radial
Lens Size: 5mm or T-1 3/4 form factor
Lens Transparency: Clear
Test Current: 20mA
RoHS3 Compliance and MSL 1 rating

Electrical Tolerance Range:

Forward Voltage (Vf): 1.8V to 2.1V (acceptable variance for series resistor adjustment in typical indicator circuits)
Wavelength - Peak: 623nm to 650nm (red spectrum range)

Mechanical Compatibility:

Height variation: 8.85mm to 10.30mm (compatible with standard PCB through-hole spacing)
Lens Style: Round with Domed Top (maintains optical and mechanical fit)

Substitute parts meeting all primary criteria and falling within electrical tolerance ranges are functionally equivalent for direct replacement in the 4308H1 application circuit.

Parameter Comparison

Part Number	Manufacturer	Vf (Typ)	mcd Rating	Viewing Angle	Wavelength Peak	Height (Max)	Product Status	Inventory
4308H1	VCC	1.8V	240mcd	24°	645nm	9.19mm	Obsolete	929 Pcs
151053RS03000	Würth Elektronik	1.9V	5000mcd	30°	631nm	8.85mm	Active	3100 Pcs
333-2SURC/S400-A8	Everlight Electronics	2V	5000mcd	10°	632nm	8.90mm	Active	741 Pcs
383-2SDRC/S530-A4	Everlight Electronics	2V	2780mcd	6°	650nm	8.90mm	Active	788 Pcs
383-2SURC/S400-A6	Everlight Electronics	2V	6300mcd	6°	632nm	8.90mm	Active	640 Pcs
383-2SURC/S530-A3	Everlight Electronics	2V	2500mcd	6°	632nm	8.90mm	Active	653 Pcs
383-2SURC/S530-A6	Everlight Electronics	2V	6300mcd	6°	632nm	8.90mm	Active	906 Pcs
7343-2SURC/H2/S400-A7	Everlight Electronics	2V	1600mcd	30°	632nm	8.85mm	Active	1091 Pcs
7343-2SURC/H2/S400-A8	Everlight Electronics	2V	2000mcd	30°	632nm	8.85mm	Active	889 Pcs
7343-2USRC/S1060	Everlight Electronics	2V	4000mcd	30°	639nm	8.85mm	Active	1035 Pcs
C503B-RCN-CW0Z0AA1	CreeLED, Inc.	2.1V	7500mcd	30°	624nm	10.30mm	Active	63712 Pcs

Engineering Selection Recommendations

All listed substitute parts are active products with ROHS3 compliance and MSL 1 rating, providing long-term supply security compared to the obsolete 4308H1.

For applications requiring closest brightness match to original 240mcd specification: 7343-2SURC/H2/S400-A7 (1600mcd) and 7343-2SURC/H2/S400-A8 (2000mcd) from Everlight Electronics provide the lowest brightness ratings among active alternatives while maintaining T-1 3/4 form factor and 30° viewing angle compatibility.

For applications with standard brightness tolerance: 383-2SURC/S530-A3 (2500mcd) and 383-2SDRC/S530-A4 (2780mcd) offer moderate brightness levels with T-1 3/4 package compatibility and established supply availability.

For applications requiring higher brightness performance: C503B-RCN-CW0Z0AA1 from CreeLED (7500mcd) and 383-2SURC/S400-A6 (6300mcd) provide enhanced luminous intensity with largest inventory availability (63712 Pcs and 640 Pcs respectively).

For applications with narrow viewing angle requirements: 383-2SURC/S400-A6, 383-2SURC/S530-A3, and 383-2SDRC/S530-A4 offer 6° viewing angles for focused indication applications.

For applications with wide viewing angle requirements: 151053RS03000 (Würth Elektronik), 7343-2SURC/H2/S400-A7, 7343-2SURC/H2/S400-A8, and 7343-2USRC/S1060 provide 30° viewing angles for distributed visibility applications.

Forward voltage differences (1.8V to 2.1V range) require series resistor adjustment in the circuit design but do not prevent functional substitution.

Frequently Asked Questions (FAQ)

Q: Can the 4308H1 be directly replaced without circuit modification? A: Direct mechanical and electrical substitution is possible within the specified voltage tolerance range (1.8V to 2.1V). However, brightness differences between the original 240mcd and substitute parts (ranging from 1600mcd to 7500mcd) may require series resistor adjustment to maintain consistent indicator brightness in the application circuit.

Q: What is the primary difference between T-1 3/4 and 5mm round package designations? A: T-1 3/4 and 5mm round refer to the same physical form factor (5mm diameter lens with through-hole radial leads). Both designations are used interchangeably in the industry and are mechanically compatible.

Q: How do viewing angle differences affect substitution suitability? A: Viewing angle (6° to 30°) determines the light distribution pattern. Narrow angles (6°) concentrate light in a focused beam, while wide angles (30°) distribute light across a broader area. Selection depends on the specific application's visibility requirements. Substitution is valid if the application can accommodate the alternative viewing angle.

Q: Are all substitute parts RoHS3 compliant? A: All listed substitute parts meet ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity requirements, ensuring compatibility with modern manufacturing and environmental standards.

Q: What wavelength range is acceptable for red LED substitution? A: The red spectrum for these components spans 623nm to 650nm peak wavelength. All substitute parts fall within this range and produce visually equivalent red indication, with minor hue variations imperceptible in typical indicator applications.

Q: Which substitute offers the best supply continuity? A: C503B-RCN-CW0Z0AA1 from CreeLED provides the largest inventory (63712 Pcs), ensuring extended supply availability. Everlight Electronics parts (7343-2SURC/H2/S400-A7, 7343-2SURC/H2/S400-A8, 7343-2USRC/S1060) also offer strong inventory levels (889-1091 Pcs each).

Q: Can forward voltage differences be accommodated in existing circuit designs? A: Yes. The 0.3V maximum difference (1.8V to 2.1V) can be managed through series resistor recalculation. Standard indicator circuits with current-limiting resistors automatically compensate for minor voltage variations while maintaining consistent LED current at the 20mA test specification.

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