LED RED CLEAR T-1 T/H 4318F1 Equivalent & Substitute Parts

Part Overview

The VCC 4318F1 is a red LED indication component in T-1 through-hole configuration with a 3mm clear domed lens. This discrete radial LED operates at 1.8V forward voltage with a 65mcd brightness rating and 45° viewing angle. The component is classified as obsolete, making equivalent substitute parts necessary for ongoing production and maintenance applications. Substitute parts must maintain compatibility with through-hole mounting, T-1 package format, and red light indication functionality while meeting current RoHS3 compliance requirements.

Key Parameters

Parameter	Value	Specification Basis
Manufacturer Part Number	4318F1	VCC
Color	Red	Light emission specification
Lens Style	Round with Domed Top	Optical configuration
Lens Size	3mm, T-1	Package format
Lens Transparency	Clear	Optical property
Voltage - Forward (Vf) Typical	1.8V	Operating voltage
Current - Test	20mA	Standard test condition
Millicandela Rating	65mcd	Brightness specification
Viewing Angle	45°	Optical dispersion
Mounting Type	Through Hole	PCB assembly method
Wavelength - Peak	650nm	Red spectrum definition
Package / Case	Radial	Lead configuration
Height (Max)	6.37mm	Physical dimension
RoHS Status	ROHS3 Compliant	Environmental compliance
Moisture Sensitivity Level (MSL)	1 (Unlimited)	Storage requirement

Substitute Part Grouping Explanation

Substitution logic for the 4318F1 is based on the following critical parameters that must align with the original component:

Mandatory Compatibility Parameters:

Mounting Type: Through Hole (all substitutes must support PCB through-hole assembly)
Package Format: T-1 3mm radial configuration (physical footprint compatibility)
Lens Configuration: Round with domed top, clear colorless lens (optical and mechanical fit)
Color: Red light emission (functional requirement)
Voltage Range: Forward voltage between 1.8V and 2.1V (circuit compatibility)
Current Rating: 20mA test current standard (electrical compatibility)
Compliance: RoHS3 compliant (regulatory requirement)

Flexible Parameters (within acceptable engineering tolerances):

Millicandela rating (brightness can vary based on application requirements)
Viewing angle (45° is standard; 30°, 40°, or 60° acceptable for different optical requirements)
Wavelength peak (650nm reference; 615nm to 650nm range acceptable for red indication)
Height variation (4.60mm to 6.37mm acceptable for through-hole applications)

Substitute parts are grouped by their alignment with these parameters. All listed substitutes maintain T-1 through-hole radial configuration and red color specification. Variations in brightness and viewing angle reflect different application scenarios while preserving core functionality.

Parameter Comparison

Parameter	4318F1 (VCC)	151033RS03000 (Würth)	204-10SURC/S400-A8 (Everlight)	264-7SDRC/S530-A3 (Everlight)	264-7SURC/S400-A8 (Everlight)	HLMA-KH00-J0000 (Broadcom)	LTL-4296N (Lite-On)	MV7043 (onsemi)	OVLBR4C7 (TT Electronics)	SSL-LX3044SIC (Lumex)	WP710A10SEC/E (Kingbright)
Color	Red	Red	Red	Red	Red	Red	Red	Red	Red	Red	Red
Lens Style	Round Domed	Round Domed	Round Domed	Round Domed	Round Domed	Round Domed	Round Domed	Round Domed	Round Domed	Round Domed	Round Domed
Lens Size	3mm T-1	3.00mm	3.00mm	2.90mm	2.90mm	3mm T-1	3mm T-1	3mm T-1	3mm T-1	3mm T-1	3mm T-1
Lens Transparency	Clear	Clear	Clear	Clear	Clear	Clear	Clear	Clear	Clear	Clear	Clear
Vf Typical (V)	1.8	2.0	2.0	2.0	2.0	1.9	2.0	2.1	2.0	2.1	2.0
Current - Test (mA)	20	20	20	20	20	20	10	20	20	20	20
Millicandela Rating (mcd)	65	2600	2000	100	800	200	60	240	3700	1800	2400
Viewing Angle (°)	45	30	20	40	40	45	45	60	45	30	30
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Wavelength - Peak (nm)	650	628	632	650	632	621	630	645	—	636	630
Package / Case	Radial	Radial	Radial	Radial	Radial	Radial	Radial	Radial	Radial	Radial	Radial
Height Max (mm)	6.37	5.55	5.50	4.80	6.20	4.70	5.85	6.30	5.35	4.60	5.90
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Obsolete	Active	Active	Active

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

The following parts provide the closest electrical and mechanical alignment with the 4318F1:

HLMA-KH00-J0000 (Broadcom Limited) - Active product status with forward voltage of 1.9V (closest to original 1.8V specification). T-1 3mm package, 45° viewing angle matching original, 200mcd brightness. RoHS3 compliant with unlimited MSL rating. Height 4.70mm accommodates standard through-hole PCB layouts. Recommended for direct replacement in voltage-sensitive applications.

LTL-4296N (Lite-On Inc.) - Active product with T-1 3mm configuration and 45° viewing angle. Forward voltage 2.0V with 60mcd brightness closely matching original 65mcd rating. RoHS3 compliant. Note: Test current specified at 10mA versus original 20mA; verify circuit current capability. Height 5.85mm suitable for standard through-hole applications.

WP710A10SEC/E (Kingbright) - Active product in T-1 3mm package with 2.0V forward voltage and 30° viewing angle. 2400mcd brightness provides higher light output for applications requiring increased visibility. RoHS3 compliant with unlimited MSL. Height 5.90mm compatible with through-hole mounting. Suitable where enhanced brightness is acceptable.

Secondary Substitutes (Acceptable with Application Review):

OVLBR4C7 (TT Electronics/Optek Technology) - Active product with 3700mcd brightness (significantly higher than original). T-1 3mm package, 2.0V forward voltage, 45° viewing angle. RoHS3 compliant. Height 5.35mm. Select only where increased brightness does not create optical interference or power dissipation concerns.

SSL-LX3044SIC (Lumex Opto/Components Inc.) - Active product with 1800mcd brightness and 2.1V forward voltage. T-1 3mm package with 30° viewing angle. RoHS3 compliant. Height 4.60mm (lowest profile option). Suitable for space-constrained through-hole layouts.

MV7043 (onsemi) - Obsolete status (same as original). 2.1V forward voltage, 240mcd brightness, 60° viewing angle. T-1 3mm package. Height 6.30mm. Use only when new active alternatives are unavailable and existing inventory is depleted.

Compatibility Considerations:

All listed substitutes maintain through-hole radial configuration and red color specification. Forward voltage variations (1.8V to 2.1V) are within acceptable range for standard LED circuit designs using current-limiting resistors. Brightness variations reflect different application requirements; select based on specific visibility needs. Viewing angle differences (20° to 60°) accommodate various optical requirements; 45° viewing angle substitutes provide closest match to original specification.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute LED with higher millicandela rating than the original 4318F1?

A: Yes, provided the circuit design accommodates the increased brightness. Higher mcd ratings (such as OVLBR4C7 at 3700mcd) require verification that the application does not experience optical interference, glare, or unintended visual effects. Circuit current limiting remains the same at 20mA test condition. Confirm with application requirements before selection.

Q: What is the significance of the forward voltage (Vf) difference between 1.8V and 2.1V?

A: Forward voltage differences within this range are accommodated by standard LED circuit designs using current-limiting resistors. The resistor value is calculated based on supply voltage and desired current, not the LED's Vf. A 0.3V variation is typical across red LED families and does not require circuit redesign. Verify that your circuit supply voltage exceeds the maximum Vf (2.1V) by at least 1-2V for proper current limiting operation.

Q: Are all substitute parts RoHS3 compliant?

A: Most listed substitutes are RoHS3 compliant. The 264-7SDRC/S530-A3 (Everlight) and MV7043 (onsemi) do not specify RoHS3 status in provided data. Confirm RoHS3 compliance with the manufacturer if regulatory compliance is required for your application.

Q: What is the difference between T-1 package and 3mm package designation?

A: T-1 and 3mm refer to the same through-hole LED package format. T-1 is the traditional designation; 3mm indicates the lens diameter. Both terms describe a round domed lens LED with 3mm diameter and radial lead configuration suitable for standard through-hole PCB assembly.

Q: Can I substitute an LED with a different viewing angle?

A: Yes, viewing angle substitution is acceptable based on application requirements. The original 4318F1 specifies 45° viewing angle. Narrower angles (20° to 30°) concentrate light in a specific direction, suitable for focused indication. Wider angles (60°) distribute light over a broader area. Select based on whether the LED must be visible from multiple angles or from a specific direction.

Q: What does "Obsolete" product status mean for the 4318F1?

A: Obsolete status indicates the manufacturer has discontinued production. The 4318F1 is no longer available from VCC. Existing inventory (739 pcs noted) represents remaining stock. Active substitute parts listed provide equivalent functionality with ongoing manufacturer support and availability. Plan component transitions to active alternatives for new designs and long-term production.

Q: Is the test current of 10mA (LTL-4296N) compatible with a 20mA circuit design?

A: The test current specification indicates the standard condition at which brightness (mcd) is measured, not a maximum operating current. The LTL-4296N can operate at 20mA; the 60mcd brightness rating is measured at 10mA. Operating at 20mA will increase brightness proportionally. Verify that the circuit's current-limiting resistor is sized for 20mA operation and that the LED's maximum current rating (typically 30mA for T-1 LEDs) is not exceeded.

Q: Which substitute offers the closest physical fit for PCB through-hole mounting?

A: HLMA-KH00-J0000 (4.70mm height) and SSL-LX3044SIC (4.60mm height) offer the lowest profiles. The original 4318F1 is 6.37mm; these lower-profile options provide more clearance for adjacent components. For standard through-hole applications without height constraints, any substitute with height between 4.60mm and 6.37mm is acceptable. Verify PCB clearance requirements before selection.

Q: Can I mix different substitute parts in the same circuit board?

A: Yes, mixing substitutes is acceptable provided each LED is individually current-limited by its own resistor. Do not share a single current-limiting resistor across multiple LED types with different forward voltages. Each LED circuit path must have independent resistor sizing based on that specific LED's Vf and desired current (20mA standard).

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