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XRCWHT-L1-0000-00537 LED XLamp® XR-C Cool White Equivalent & Substitute Parts
Part Overview
The XRCWHT-L1-0000-00537 is a CreeLED XLamp® XR-C cool white surface mount LED in 3529 (9073 Metric) package configuration. This part is classified as obsolete and has been superseded by active XLamp® XR-E alternatives. Substitute parts maintain mechanical compatibility, electrical performance within specified ranges, and regulatory compliance, enabling direct functional replacement in surface mount applications requiring 350mA operation at 3.3V to 4.6V forward voltage.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | XRCWHT-L1-0000-00537 |
| Manufacturer | CreeLED, Inc. |
| Series | XLamp® XR-C |
| Product Status | Obsolete |
| Color | White |
| Flux @ 25°C, 350mA | 59lm (57lm ~ 62lm) |
| Forward Voltage (Typ) | 4.6V |
| Test Current | 350mA |
| Maximum Current | 500mA |
| Lumens/Watt @ 350mA | 48 lm/W |
| Viewing Angle | 90° |
| Package / Case | 3529 (9073 Metric) |
| Size / Dimension | 0.354" L x 0.276" W (9.00mm x 7.00mm) |
| Height - Seated (Max) | 0.181" (4.60mm) |
| Thermal Resistance | 12°C/W |
| Mounting Type | Surface Mount |
| RoHS Status | RoHS Compliant |
| MSL Rating | 4 (72 Hours) |
Substitute Part Grouping Explanation
Substitution eligibility is determined by the following criteria:
Mechanical Compatibility: All substitute parts use identical 3529 (9073 Metric) package with matching footprint dimensions (9.00mm x 7.00mm) and maximum seated height (4.60mm), ensuring PCB layout compatibility without redesign.
Electrical Performance: Substitute parts operate at 350mA test current with luminous flux output of 59lm (57lm ~ 62lm) at 25°C, matching the original specification. Forward voltage ranges from 3.3V to 4.6V across the substitute family, within acceptable circuit design tolerances for typical LED driver configurations.
Optical Characteristics: All parts maintain 90° viewing angle and white color specification, preserving optical performance in the original application context.
Regulatory Compliance: All substitute parts carry RoHS Compliant status, REACH Unaffected designation, and MSL 4 (72 Hours) rating, matching the original part's compliance profile.
Series Transition: Substitute parts transition from obsolete XLamp® XR-C series to active XLamp® XR-E series, with XREWHT-L1-0000-00601 offering enhanced performance (56 lm/W, 75 CRI Typ, 1A maximum current) and remaining parts providing direct parametric equivalence (51 lm/W, 700mA maximum current).
Parameter Comparison
| Part Number | Series | Status | Vf (Typ) | Flux @ 25°C, 350mA | lm/W @ 350mA | Max Current | CRI (Typ) | Thermal Resistance | Inventory |
|---|---|---|---|---|---|---|---|---|---|
| XRCWHT-L1-0000-00537 | XLamp® XR-C | Obsolete | 4.6V | 59lm (57-62) | 48 | 500mA | — | 12°C/W | 781 Pcs |
| XREWHT-L1-0000-00601 | XLamp® XR-E | Active | 3.3V | 65lm (62-67) | 56 | 1A | 75 | 8°C/W | 1167 Pcs |
| XREWHT-L1-0000-005B6 | XLamp® XR-E | Active | 3.3V | 59lm (57-62) | 51 | 700mA | — | 8°C/W | 776 Pcs |
| XREWHT-L1-0000-005B7 | XLamp® XR-E | Active | 3.3V | 59lm (57-62) | 51 | 700mA | — | 8°C/W | 989 Pcs |
| XREWHT-L1-0000-005B8 | XLamp® XR-E | Active | 3.3V | 59lm (57-62) | 51 | 700mA | — | 8°C/W | 925 Pcs |
| XREWHT-L1-0000-005B9 | XLamp® XR-E | Active | 3.3V | 59lm (57-62) | 51 | 700mA | — | 8°C/W | 929 Pcs |
| XREWHT-L1-R250-005B6 | XLamp® XR-E | Active | 3.3V | 59lm (57-62) | 51 | — | — | 8°C/W | 707 Pcs |
| XREWHT-L1-R250-005B7 | XLamp® XR-E | Active | 3.3V | 59lm (57-62) | 51 | — | — | 8°C/W | 1048 Pcs |
| XREWHT-L1-R250-005B8 | XLamp® XR-E | Active | 3.3V | 59lm (57-62) | 51 | — | — | 8°C/W | 938 Pcs |
| XREWHT-L1-R250-005B9 | XLamp® XR-E | Active | 3.3V | 59lm (57-62) | 51 | — | — | 8°C/W | 697 Pcs |
Engineering Selection Recommendations
Primary Substitute: XREWHT-L1-0000-00601 is the recommended substitute for new designs and production transitions. This part is active status, offers superior luminous efficiency (56 lm/W vs. 48 lm/W), improved thermal performance (8°C/W vs. 12°C/W), higher maximum current rating (1A vs. 500mA), and includes CRI specification (75 Typ). All regulatory certifications (RoHS Compliant, REACH Unaffected, MSL 4) are maintained.
Direct Parametric Equivalents: Parts XREWHT-L1-0000-005B6, XREWHT-L1-0000-005B7, XREWHT-L1-0000-005B8, and XREWHT-L1-0000-005B9 provide identical luminous flux output (59lm at 350mA) and matching forward voltage (3.3V). These parts are suitable for applications where the original 48 lm/W efficiency is acceptable and higher current capability is not required. All are active status with full regulatory compliance.
Tape & Reel Variants: Parts designated with R250 suffix (XREWHT-L1-R250-005B6 through XREWHT-L1-R250-005B9) are packaging variants of the parametric equivalents, maintaining identical electrical and optical specifications with Tape & Reel packaging format. Maximum current specification is not provided for these variants; verify circuit requirements before selection.
Thermal Consideration: All XLamp® XR-E substitutes feature improved thermal resistance (8°C/W) compared to the original XLamp® XR-C (12°C/W), resulting in lower junction temperatures at equivalent power dissipation and enhanced reliability in thermally constrained applications.
Frequently Asked Questions (FAQ)
Q: Can XREWHT-L1-0000-00601 be used as a direct drop-in replacement?
A: Yes. XREWHT-L1-0000-00601 maintains identical mechanical compatibility (3529 package, 9.00mm x 7.00mm footprint, 4.60mm height) and operates at 350mA test current with matching 59lm output at 25°C. Forward voltage is 3.3V versus the original 4.6V; verify circuit design accommodates this 0.2V reduction. The part is active status with full RoHS and REACH compliance.
Q: What is the difference between XREWHT-L1-0000-005B6 and XREWHT-L1-R250-005B6?
A: These parts are electrically and optically identical. The R250 designation indicates Tape & Reel packaging format, while the non-R250 variant uses standard packaging. Both maintain 3529 package dimensions and 350mA operation. Verify packaging requirements for your assembly process before selection.
Q: Why does XREWHT-L1-0000-00601 show higher lumens per watt (56 lm/W) than the original part (48 lm/W)?
A: XREWHT-L1-0000-00601 represents an improved XLamp® XR-E generation with enhanced LED die efficiency and optimized phosphor formulation. The higher efficiency is a documented specification difference between the obsolete XR-C and active XR-E series. This improvement reduces power consumption at equivalent light output.
Q: Are all substitute parts RoHS compliant?
A: Yes. All listed substitute parts carry RoHS Compliant status and REACH Unaffected designation, matching the original part's regulatory profile. MSL rating is 4 (72 Hours) across all parts.
Q: What is the significance of the thermal resistance difference (12°C/W vs. 8°C/W)?
A: Lower thermal resistance indicates improved heat dissipation from the LED die to the PCB. The 8°C/W rating of XLamp® XR-E substitutes results in approximately 4°C lower junction temperature at equivalent power dissipation compared to the original 12°C/W XLamp® XR-C, enhancing long-term reliability and light output stability.
Q: Can I use parts with unspecified maximum current ratings?
A: Parts with R250 suffix show maximum current as unspecified in the provided data. For these variants, operate at the 350mA test current specification. Contact the manufacturer for maximum current ratings if higher current operation is required in your application.
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