BZD27C18P-M-08 Equivalent & Substitute Parts

Part Overview

The BZD27C18P-M-08 is an 18 V, 800 mW Zener diode manufactured by Vishay General Semiconductor - Diodes Division in the DO-219AB surface mount package. This component is classified as Active product status and is RoHS3 compliant. Equivalent and substitute parts are identified when circuit designs require alternative packaging formats, different power ratings, or sourcing from alternative manufacturers while maintaining core electrical specifications for voltage regulation and transient protection applications.

Key Parameters

Parameter	Value
Voltage - Zener (Nom)	18 V
Power - Max	800 mW
Impedance (Max)	15 Ohms
Current - Reverse Leakage @ Vr	1 µA @ 13 V
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 200 mA
Operating Temperature Range	-65°C ~ 175°C
Mounting Type	Surface Mount
Package / Case	DO-219AB
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the BZD27C18P-M-08 is determined by the following critical electrical and mechanical parameters:

Electrical Equivalence Criteria:

Nominal Zener voltage of 18 V
Surface mount technology classification
RoHS3 compliance status
Operating temperature range compatibility

Mechanical Compatibility Considerations:

Package format change from DO-219AB to alternative surface mount packages
Power dissipation rating differences
Impedance and leakage current variations within acceptable application tolerances

The BZT52H-C18,115 substitute part maintains the 18 V Zener voltage specification and surface mount technology. However, this substitute exhibits reduced maximum power dissipation (375 mW versus 800 mW), different impedance characteristics (20 Ohms versus 15 Ohms), and operates within a narrower temperature range (-65°C to 150°C versus -65°C to 175°C). These differences require circuit-level evaluation for specific application requirements.

Parameter Comparison

Parameter	BZD27C18P-M-08 (Main)	BZT52H-C18,115 (Substitute)
Manufacturer	Vishay General Semiconductor - Diodes Division	Nexperia USA Inc.
Voltage - Zener (Nom)	18 V	18 V
Tolerance	Not specified	±5%
Power - Max	800 mW	375 mW
Impedance (Max)	15 Ohms	20 Ohms
Current - Reverse Leakage @ Vr	1 µA @ 13 V	50 nA @ 12.6 V
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 200 mA	900 mV @ 10 mA
Operating Temperature Range	-65°C ~ 175°C	-65°C ~ 150°C
Mounting Type	Surface Mount	Surface Mount
Package / Case	DO-219AB	SOD-123F
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active
Qualification	Not specified	AEC-Q101

Engineering Selection Recommendations

Primary Part Selection: The BZD27C18P-M-08 is recommended for applications requiring the full 800 mW power dissipation capability and extended operating temperature range to 175°C. This part maintains Active product status with unlimited moisture sensitivity classification and RoHS3 compliance.

Substitute Part Selection: The BZT52H-C18,115 is suitable for applications where power dissipation requirements do not exceed 375 mW and operating temperatures remain within the -65°C to 150°C range. This substitute offers AEC-Q101 automotive qualification, indicating suitability for automotive-grade applications. The SOD-123F package provides a smaller footprint alternative to the DO-219AB package.

Compliance Considerations: Both parts maintain RoHS3 compliance, REACH unaffected status, and unlimited moisture sensitivity classification (MSL 1). Selection between these parts should be based on specific circuit power dissipation requirements, thermal management capabilities, and package space constraints rather than regulatory compliance factors.

Frequently Asked Questions (FAQ)

Q: Can the BZT52H-C18,115 directly replace the BZD27C18P-M-08 in all applications?

A: Direct replacement is limited by power dissipation differences. The BZT52H-C18,115 has a maximum power rating of 375 mW compared to 800 mW for the BZD27C18P-M-08. Applications requiring power dissipation above 375 mW require the original part or alternative high-power Zener diodes.

Q: What are the package differences between these parts?

A: The BZD27C18P-M-08 uses the DO-219AB (SMF) package, while the BZT52H-C18,115 uses the SOD-123F package. These are different surface mount packages with different footprints and land patterns. PCB layout modifications are required when substituting between these packages.

Q: Are there temperature range limitations when using the substitute part?

A: The BZT52H-C18,115 operates from -65°C to 150°C, while the BZD27C18P-M-08 operates from -65°C to 175°C. Applications requiring operation above 150°C ambient temperature require the original BZD27C18P-M-08 part.

Q: What is the significance of the AEC-Q101 qualification on the substitute part?

A: AEC-Q101 qualification indicates the BZT52H-C18,115 meets automotive industry reliability standards. This qualification is relevant for automotive applications but does not affect general industrial or consumer electronics applications.

Q: How do impedance differences affect circuit performance?

A: The BZT52H-C18,115 has a maximum impedance of 20 Ohms compared to 15 Ohms for the BZD27C18P-M-08. Higher impedance results in increased voltage ripple under transient conditions. Applications with strict voltage regulation requirements should verify impedance specifications against circuit design tolerances.

Q: What is the difference in reverse leakage current between these parts?

A: The BZD27C18P-M-08 has 1 µA reverse leakage at 13 V, while the BZT52H-C18,115 has 50 nA reverse leakage at 12.6 V. The substitute part exhibits significantly lower leakage current, which may improve circuit performance in low-current applications.

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