Equivalent & Substitute Parts for 3YC-F Yellow LED T-1 Through Hole

Part Overview

The Bivar Inc. 3YC-F is a yellow LED indication component featuring a clear lens with 40mcd brightness rating, designed for through-hole mounting applications. This part operates at 2V forward voltage with a 20° viewing angle and 3mm T-1 form factor. The 3YC-F is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain functional compatibility within yellow LED indication circuits.

Substiute Parts

3YC-F

Bivar Inc.In Stock: 8153YC-F Datasheet

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3YD-F

Bivar Inc.In Stock: 9513YD-F Datasheet

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151031YS06000

Würth ElektronikIn Stock: 2948151031YS06000 Datasheet

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LTL-4256N

Lite-On Inc.In Stock: 924LTL-4256N Datasheet

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LTL1CHKSKNN

Lite-On Inc.In Stock: 1610LTL1CHKSKNN Datasheet

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SLR-342DC3F

Rohm SemiconductorIn Stock: 2978SLR-342DC3F Datasheet

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SLR-343YC3F

Rohm SemiconductorIn Stock: 1644SLR-343YC3F Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution compatibility for the 3YC-F is determined by the following critical parameters:

Primary Compatibility Criteria:

• Color: Yellow (590nm wavelength range)
• Mounting Type: Through Hole
• Lens Size: 3mm T-1 form factor
• Voltage - Forward (Vf): 2V nominal range (2.0V to 2.1V acceptable)
• Current - Test: 20mA operation
• Package / Case: Radial configuration
• Moisture Sensitivity Level: MSL 1

Secondary Compatibility Parameters:

• Millicandela Rating: 40mcd (range 20mcd to 320mcd acceptable for indication applications)
• Viewing Angle: 20° to 60° acceptable
• Height (Max): 5.20mm to 5.85mm acceptable
• Lens Transparency: Clear or Diffused acceptable for yellow indication

The following substitute parts meet these criteria:

Direct Equivalents (Clear Lens, Yellow, 40mcd class):

• LTL-4256N (Lite-On Inc.) - 40mcd, clear lens, 2.1V
• LTL1CHKSKNN (Lite-On Inc.) - 320mcd, clear lens, 2.05V

Compatible Alternatives (Yellow, Through Hole, T-1):

• 3YD-F (Bivar Inc.) - Diffused lens variant, 20mcd, 2V
• 151031YS06000 (Würth Elektronik) - Diffused lens, 110mcd, 2V
• SLR-343YC3F (Rohm Semiconductor) - Yellow lens, 16mcd, 2.1V

Non-Recommended Substitutes:

• SLR-342DC3F (Rohm Semiconductor) - Orange color (605nm), not yellow

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Clear Lens, 40mcd Brightness Class):

LTL-4256N (Lite-On Inc.) provides the closest functional match to the 3YC-F. Both components feature clear lenses, 40mcd brightness ratings, 3mm T-1 form factors, and radial through-hole mounting. The LTL-4256N operates at 2.1V forward voltage (0.1V higher than 3YC-F) and 10mA test current (half the 3YC-F specification). This component is ROHS3 compliant and carries active product status. Circuit design must accommodate the reduced test current specification.

For Higher Brightness Applications:

LTL1CHKSKNN (Lite-On Inc.) offers 320mcd brightness with clear lens and 3mm T-1 form factor, suitable for applications requiring increased visibility. Forward voltage is 2.05V and test current is 20mA, matching the 3YC-F current specification. This component is ROHS3 compliant with active product status and REACH unaffected classification.

For Diffused Lens Applications:

3YD-F (Bivar Inc.) is the manufacturer's own diffused lens variant, maintaining identical forward voltage (2V) and test current (20mA) specifications. This component is ROHS3 compliant with active product status. The diffused lens provides wider viewing angle (35° versus 20°) at reduced brightness (20mcd).

151031YS06000 (Würth Elektronik) offers diffused lens configuration with 110mcd brightness and 60° viewing angle. Forward voltage is 2V with 20mA test current. This component is ROHS3 compliant, active product status, and REACH unaffected.

Not Recommended:

SLR-342DC3F (Rohm Semiconductor) is orange (605nm wavelength), not yellow, and therefore not suitable for yellow indication applications. SLR-343YC3F (Rohm Semiconductor) carries "Not For New Designs" status and should not be selected for new circuit implementations.

Frequently Asked Questions (FAQ)

Q: Can LTL-4256N replace 3YC-F directly in existing circuits?

A: LTL-4256N is functionally compatible with 3YC-F for yellow LED indication applications. Both components feature clear lenses, 40mcd brightness, 3mm T-1 form factors, and radial through-hole mounting. The primary difference is test current specification: LTL-4256N operates at 10mA while 3YC-F operates at 20mA. Circuit current-limiting resistor values must be recalculated based on the 2.1V forward voltage of LTL-4256N versus 2V for 3YC-F.

Q: What is the difference between clear and diffused lens options?

A: Clear lens components (3YC-F, LTL-4256N, LTL1CHKSKNN) provide narrow viewing angles (20° to 45°) with concentrated brightness in the forward direction. Diffused lens components (3YD-F, 151031YS06000) provide wider viewing angles (35° to 60°) with distributed brightness across a broader field of view. Selection depends on application requirements for directional visibility versus omnidirectional indication.

Q: Why is SLR-342DC3F listed as a substitute but not recommended?

A: SLR-342DC3F is orange (605nm wavelength), not yellow (590nm). Although it shares the same T-1 form factor, radial mounting, and through-hole configuration, the color difference makes it unsuitable for applications requiring yellow indication. This component appears in the 3YC-F substitute list but does not meet the yellow color requirement.

Q: What is the significance of "Not For New Designs" status?

A: Components marked "Not For New Designs" (such as SLR-343YC3F) are in mature or declining production phases. While they may remain available for legacy system support, they should not be selected for new circuit implementations. Active product status components (3YD-F, 151031YS06000, LTL-4256N, LTL1CHKSKNN) are preferred for new designs.

Q: Are all substitute parts ROHS3 compliant?

A: All active substitute parts listed (3YD-F, 151031YS06000, LTL-4256N, LTL1CHKSKNN) are ROHS3 compliant. The main part 3YC-F does not specify RoHS status due to its obsolete classification. All components maintain MSL 1 (Unlimited) moisture sensitivity level.

Q: How do brightness ratings affect circuit design?

A: Brightness rating (millicandela) determines the luminous intensity of the LED at specified test current. The 3YC-F operates at 40mcd with 20mA test current. Substitute parts range from 16mcd to 320mcd. Higher brightness components (LTL1CHKSKNN at 320mcd) provide increased visibility but may require circuit adjustment. Lower brightness components (3YD-F at 20mcd, SLR-343YC3F at 16mcd) reduce power consumption but provide less visibility. Selection depends on application visibility requirements and power budget constraints.

Q: What is the impact of forward voltage differences?

A: The 3YC-F operates at 2V forward voltage. Substitute parts range from 2V to 2.1V. This 0.1V difference affects circuit current-limiting resistor calculations. For a fixed supply voltage, higher forward voltage results in lower LED current. Circuit designers must recalculate resistor values using the formula: R = (Vsupply - Vf) / Iled, where Vf is the forward voltage of the selected component and Iled is the desired LED current.

Q: Can components with different test currents be used interchangeably?

A: Components with different test current specifications (10mA versus 20mA) can be used interchangeably if circuit current-limiting resistors are adjusted accordingly. The test current specification indicates the current at which the brightness rating is measured. Actual circuit operation current is determined by the current-limiting resistor value and supply voltage, independent of the test current specification. However, maximum continuous current ratings must not be exceeded.