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TLDR6400 Equivalent & Substitute Parts
Part Overview
The TLDR6400 is a red diffused T-1 3/4 through-hole LED manufactured by Vishay Semiconductor Opto Division. This discrete LED indication component operates at 1.8V forward voltage with a 70mcd brightness rating and 648nm dominant wavelength. The part is currently active in production with ROHS3 compliance and unlimited moisture sensitivity rating.
Substitute parts are necessary when the TLDR6400 becomes unavailable, when alternative sourcing is required for supply chain optimization, or when design flexibility permits selection from qualified alternatives meeting equivalent electrical and mechanical specifications.
Substiute Parts
Key Parameters
| Parameter | TLDR6400 Specification |
|---|---|
| Color | Red |
| Lens Transparency | Diffused |
| Lens Style | Round with Domed Top |
| Lens Size | 5mm, T-1 3/4 |
| Voltage - Forward (Vf) Typical | 1.8V |
| Current - Test | 20mA |
| Millicandela Rating | 70mcd |
| Wavelength - Dominant | 648nm |
| Wavelength - Peak | 650nm |
| Viewing Angle | 60° |
| Mounting Type | Through Hole |
| Package / Case | Radial |
| Height Maximum | 9.00mm |
| RoHS Status | ROHS3 Compliant |
| Product Status | Active |
Substitute Part Grouping Explanation
Substitution eligibility for the TLDR6400 is determined by the following criteria:
Primary Compatibility Parameters:
- Color: Red
- Lens Transparency: Diffused
- Mounting Type: Through Hole
- Package Type: Radial (T-1 3/4 or equivalent 5mm form factor)
- RoHS Compliance: ROHS3 Compliant
Secondary Electrical Parameters:
- Voltage - Forward (Vf): 1.8V to 2.0V range
- Current - Test: 10mA to 20mA range
- Millicandela Rating: 2.1mcd to 70mcd (brightness variation acceptable based on application requirements)
- Wavelength - Dominant: 623nm to 648nm (red spectrum)
Mechanical Parameters:
- Height Maximum: 6.35mm to 9.19mm (form factor compatibility)
- Lens Size: 4.75mm to 5mm diameter
Substitute parts meeting these parameters are functionally equivalent for through-hole red LED indication applications. Parts with different forward voltages, brightness ratings, or viewing angles remain compatible when circuit design accommodates the parameter variation.
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Color | Lens Transparency | Vf (Typ) | Current - Test | Millicandela | Wavelength - Dominant | Viewing Angle | Height Max (mm) | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|---|---|
| TLDR6400 | Vishay Semiconductor Opto Division | Red | Diffused | 1.8V | 20mA | 70mcd | 648nm | 60° | 9.00 | Active | ROHS3 Compliant |
| 5219240F | Dialight | Red | Diffused | — | 10mA | 6.3mcd | — | — | 8.94 | Active | ROHS3 Compliant |
| 5219672F | Dialight | Red | Diffused | 2V | 20mA | 60mcd | 623nm | 60° | 8.21 | Active | ROHS3 Compliant |
| HLMP-3301-F00DD | Broadcom Limited | Red | Diffused | 1.9V | 10mA | 5.4mcd | 626nm | 60° | 9.19 | Active | ROHS3 Compliant |
| HLMP-3351 | Broadcom Limited | Red | Diffused | 1.9V | 10mA | 5.4mcd | 626nm | 50° | 6.35 | Active | ROHS3 Compliant |
| HLMP-3351-D0000 | Broadcom Limited | Red | Diffused | 1.9V | 10mA | 2.1mcd | 626nm | 50° | 6.35 | Active | ROHS3 Compliant |
| HLMP-3351-D0002 | Broadcom Limited | Red | Diffused | 1.9V | 10mA | 2.1mcd | 626nm | 50° | 6.35 | Active | ROHS3 Compliant |
| HLMP-3600-D00B2 | Broadcom Limited | Red | Diffused, Tinted | 5V | 10mA | 2.1mcd | 635nm | 60° | — | Active | ROHS3 Compliant |
| HLMP-D101 | Broadcom Limited | Red | Diffused | 1.8V | 20mA | 70mcd | 637nm | 65° | 9.19 | Active | ROHS3 Compliant |
| HLMP-D150 | onsemi | Red | — | — | — | — | — | — | — | Obsolete | — |
| LTL-10223W | Lite-On Inc. | Red | Diffused | 2V | 10mA | 60mcd | 623nm | 60° | 7.20 | Active | ROHS3 Compliant |
Engineering Selection Recommendations
Highest Compatibility Substitutes:
HLMP-D101 (Broadcom Limited) provides the closest electrical and optical match to the TLDR6400. Both parts operate at 1.8V forward voltage, support 20mA test current, and deliver 70mcd brightness. The HLMP-D101 is active in production with ROHS3 compliance. Height difference of 0.19mm and viewing angle variation of 5° are within acceptable mechanical tolerances for standard through-hole PCB applications.
5219672F (Dialight) and LTL-10223W (Lite-On Inc.) are functionally equivalent alternatives. Both operate at 2V forward voltage with 60mcd brightness and 60° viewing angle. These parts accommodate the 0.2V forward voltage increase through standard current-limiting resistor adjustment in circuit design. Both are active products with ROHS3 compliance.
Lower Brightness Alternatives:
HLMP-3301-F00DD, HLMP-3351, HLMP-3351-D0000, and HLMP-3351-D0002 (Broadcom Limited) operate at 1.9V forward voltage with reduced brightness ratings (2.1mcd to 5.4mcd). These parts are suitable for applications where lower brightness is acceptable or preferred. All are active products with ROHS3 compliance.
Not Recommended:
HLMP-D150 (onsemi) is obsolete and should not be selected for new designs or ongoing production.
HLMP-3600-D00B2 (Broadcom Limited) features right-angle mounting and 5V operation, making it incompatible with standard through-hole radial applications requiring 1.8V to 2V operation.
5219240F (Dialight) operates at 10mA test current with significantly reduced brightness (6.3mcd), limiting its suitability for applications requiring the TLDR6400's 70mcd output.
Frequently Asked Questions (FAQ)
Q: Can HLMP-D101 directly replace TLDR6400 without circuit modification?
A: Yes. HLMP-D101 matches the TLDR6400 in forward voltage (1.8V), test current (20mA), brightness (70mcd), and through-hole radial package. No circuit redesign is required.
Q: What circuit changes are needed when substituting 5219672F or LTL-10223W?
A: These parts operate at 2V forward voltage compared to TLDR6400's 1.8V. Adjust the current-limiting resistor value to account for the 0.2V increase. The resistor adjustment formula: R_new = R_old × (V_supply - 2V) / (V_supply - 1.8V). No other circuit modifications are necessary.
Q: Are lower brightness alternatives (HLMP-3351 series) suitable for my application?
A: Lower brightness alternatives are suitable only if your application does not require the TLDR6400's 70mcd output. Verify that 2.1mcd to 5.4mcd brightness meets your visibility requirements before substitution.
Q: What is the mechanical compatibility of substitute parts?
A: All recommended substitutes use through-hole radial packages with 5mm T-1 3/4 form factors. Height variations range from 6.35mm to 9.19mm. Verify PCB clearance and component spacing accommodate the specific substitute part's height before assembly.
Q: Are all substitute parts RoHS3 compliant?
A: All active substitute parts listed are ROHS3 compliant. HLMP-D150 is obsolete and should not be used. Verify compliance documentation for any part selected for production use.
Q: Can HLMP-3600-D00B2 replace TLDR6400?
A: No. HLMP-3600-D00B2 is a right-angle mounted circuit board indicator LED operating at 5V, fundamentally incompatible with TLDR6400's through-hole radial package and 1.8V operation.
Q: What inventory considerations apply to substitute selection?
A: Inventory availability varies by substitute part. Consult current stock levels with your component supplier. HLMP-D101 (32,743 pcs), LTL-10223W (130,782 pcs), and HLMP-3351-D0000 (19,677 pcs) show substantial availability. Dialight 5219672F (2,314 pcs) and 5219240F (2,526 pcs) show lower stock levels.
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