LZ52C18W Equivalent & Substitute Parts

Part Overview

The LZ52C18W is a Zener diode manufactured by Diodes Incorporated, rated at 18 V nominal voltage with 500 mW maximum power dissipation. This component is packaged in 1206 (3216 Metric) surface mount configuration and features ±2% voltage tolerance. The LZ52C18W is classified as obsolete, necessitating identification of active equivalent components for new designs and ongoing production requirements. Substitute parts must maintain electrical performance within the specified voltage, power, and thermal operating parameters while accommodating packaging and tolerance variations.

Substiute Parts

LZ52C18W

Diodes IncorporatedIn Stock: 49082LZ52C18W Datasheet

Current PartRFQ

BZT52C18-7-F

Diodes IncorporatedIn Stock: 193330BZT52C18-7-F Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LZ52C18W is determined by the following critical electrical and mechanical parameters:

Electrical Matching Criteria:

• Nominal Zener voltage of 18 V
• Maximum power dissipation of 500 mW
• Reverse leakage current specification of 100 nA
• Operating temperature range compatibility

Mechanical Compatibility:

• Surface mount mounting type
• Package form factor (1206 or SOD-123 equivalent footprints)

Compliance Requirements:

• ROHS3 compliance
• Active product status for ongoing availability

The BZT52C18-7-F meets the core electrical specifications (18 V nominal, 500 mW power rating, 100 nA reverse leakage) and maintains ROHS3 compliance. Tolerance variation (±6% versus ±2%) and package form factor differences (SOD-123 versus 1206) represent the primary distinctions between the main part and substitute.

Parameter Comparison

Engineering Selection Recommendations

BZT52C18-7-F as Primary Substitute:

The BZT52C18-7-F is the manufacturer-recommended substitute for the obsolete LZ52C18W. Both components are manufactured by Diodes Incorporated and maintain identical nominal Zener voltage (18 V) and maximum power dissipation (500 mW) specifications. The BZT52C18-7-F carries active product status, ensuring continued availability for production and design implementation.

Compliance Alignment:

Both the LZ52C18W and BZT52C18-7-F are ROHS3 compliant and carry REACH Unaffected status, meeting regulatory requirements for electronic component deployment.

Operational Considerations:

The BZT52C18-7-F operates within a maximum temperature range of -65°C to 150°C, compared to the LZ52C18W range of -65°C to 175°C. Applications requiring operation above 150°C require evaluation against the substitute's thermal limits. The impedance specification of the BZT52C18-7-F (45 Ohms maximum) is lower than the LZ52C18W (50 Ohms maximum), providing improved dynamic response characteristics.

Tolerance Specification:

The BZT52C18-7-F carries a ±6% voltage tolerance compared to the LZ52C18W ±2% tolerance. Circuit designs dependent on tighter voltage tolerance margins require assessment of the wider tolerance impact on system performance.

Package Form Factor:

The BZT52C18-7-F utilizes SOD-123 packaging, whereas the LZ52C18W uses 1206 (3216 Metric) packaging. PCB layout modifications are required to accommodate the different footprint geometries.

Frequently Asked Questions (FAQ)

Q: Can the BZT52C18-7-F directly replace the LZ52C18W without PCB modifications?

A: No. The BZT52C18-7-F uses SOD-123 packaging while the LZ52C18W uses 1206 (3216 Metric) packaging. Different footprint geometries require PCB layout changes. Electrical functionality is compatible when package constraints are addressed.

Q: What is the impact of the ±6% tolerance on the BZT52C18-7-F compared to the ±2% tolerance of the LZ52C18W?

A: The BZT52C18-7-F exhibits a wider voltage tolerance band (±6%) relative to the LZ52C18W (±2%). For an 18 V nominal device, this represents a tolerance range of 16.92 V to 19.08 V for the substitute versus 17.64 V to 18.36 V for the original. Circuit designs must accommodate this expanded tolerance window.

Q: Are there thermal operating range differences between these components?

A: Yes. The LZ52C18W operates from -65°C to 175°C, while the BZT52C18-7-F operates from -65°C to 150°C. Applications requiring operation above 150°C must evaluate the BZT52C18-7-F's thermal limitations.

Q: Do both components meet the same regulatory compliance standards?

A: Yes. Both the LZ52C18W and BZT52C18-7-F are ROHS3 compliant and REACH unaffected, meeting equivalent regulatory requirements.

Q: What is the significance of the impedance difference between the two parts?

A: The BZT52C18-7-F impedance (45 Ohms maximum) is lower than the LZ52C18W impedance (50 Ohms maximum). Lower impedance provides improved transient response and voltage regulation characteristics in dynamic circuit conditions.

Q: Is the BZT52C18-7-F available in the same packaging as the LZ52C18W?

A: No. The BZT52C18-7-F is available only in SOD-123 packaging. The LZ52C18W 1206 (3216 Metric) package is not offered for the BZT52C18-7-F variant. Alternative part numbers within the BZT52 series may offer different packaging options.