CMOZ30V BK Zener Diode Equivalent & Substitute Parts

Part Overview

The CMOZ30V BK is a 30 V Zener diode manufactured by Central Semiconductor Corp, rated for 300 mW power dissipation in a surface mount SOD-523 package. This component is classified as an active product and is currently in stock with 716 units available. Zener diodes of this specification are used in voltage regulation, overvoltage protection, and reference voltage applications in electronic circuits.

Substitute parts are identified when equivalent electrical performance can be maintained within the allowed parameter tolerances for this product category, while accommodating different manufacturer specifications, compliance certifications, or packaging configurations.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	30	V
Tolerance	±5%	-
Power - Max	300	mW
Impedance (Max)	80	Ohms
Current - Reverse Leakage @ Vr	50	nA @ 21 V
Voltage - Forward (Vf) (Max) @ If	900	mV @ 10 mA
Operating Temperature Range	-65 to 175	°C
Mounting Type	Surface Mount	-
Package / Case	SOD-523	-
Moisture Sensitivity Level	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitution of the CMOZ30V BK is determined by strict equivalence in the following critical parameters:

Primary Equivalence Criteria:

Zener voltage: 30 V nominal
Package type: SOD-523 surface mount
Mounting type: Surface mount
Impedance (Max): 80 Ohms
Reverse leakage current: 50 nA @ 21 V
Moisture sensitivity level: 1 (Unlimited)

Allowable Variations:

Tolerance: ±5% or tighter (±2% is acceptable)
Power rating: Equal to or greater than 300 mW
Forward voltage: Within specified range for the application
Operating temperature range: Must encompass or match the required operating window
Packaging configuration: Tape & Reel acceptable as alternative to standard packaging

The BZT585B30T-7 manufactured by Diodes Incorporated meets all primary equivalence criteria and is classified as a manufacturer-recommended substitute.

Parameter Comparison

Parameter	CMOZ30V BK (Main Part)	BZT585B30T-7 (Substitute)	Compatibility
Manufacturer	Central Semiconductor Corp	Diodes Incorporated	Different manufacturer
Voltage - Zener (Nom)	30 V	30 V	Equivalent
Tolerance	±5%	±2%	Substitute tighter tolerance
Power - Max	300 mW	350 mW	Substitute higher rating
Impedance (Max)	80 Ohms	80 Ohms	Equivalent
Current - Reverse Leakage @ Vr	50 nA @ 21 V	50 nA @ 21 V	Equivalent
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA	1.1 V @ 100 mA	Different test conditions
Operating Temperature Range	-65 to 175°C	-65 to 150°C	Substitute narrower range
Package / Case	SOD-523	SOD-523	Equivalent
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Equivalent
RoHS Status	RoHS non-compliant	ROHS3 Compliant	Substitute compliant

Engineering Selection Recommendations

CMOZ30V BK Selection Criteria:

Primary choice when RoHS non-compliant components are acceptable or required by specification
Suitable for applications with operating temperatures up to 175°C
Appropriate when ±5% tolerance meets circuit requirements
Use when 300 mW power dissipation is the limiting specification

BZT585B30T-7 Selection Criteria:

Primary choice for RoHS3-compliant designs and regulated supply chains
Suitable for applications with operating temperatures up to 150°C
Provides tighter ±2% tolerance for precision voltage reference applications
Higher 350 mW power rating provides additional thermal margin
Available in Tape & Reel packaging for automated assembly processes
Recommended when component compliance certifications are mandatory

Both parts are active products with confirmed inventory availability. Selection between them depends on regulatory compliance requirements, operating temperature specifications, and tolerance precision needed for the application circuit.

Frequently Asked Questions (FAQ)

Q: Can BZT585B30T-7 replace CMOZ30V BK in all applications?

A: Substitution is valid when the application operating temperature does not exceed 150°C. The CMOZ30V BK operates to 175°C, so applications requiring the full temperature range must use the original part. All other electrical parameters are equivalent or superior in the substitute.

Q: What is the difference in tolerance between these parts?

A: CMOZ30V BK has ±5% tolerance on the 30 V zener voltage, while BZT585B30T-7 has ±2% tolerance. The tighter tolerance of the substitute provides better voltage regulation accuracy in precision applications.

Q: Are the SOD-523 packages physically identical?

A: Both parts use the SC-79 / SOD-523 surface mount package. Physical dimensions and PCB footprints are identical. The difference is in packaging configuration: CMOZ30V BK uses standard packaging, while BZT585B30T-7 is supplied in Tape & Reel format for automated assembly.

Q: What is the impact of the 50 mW power rating difference?

A: BZT585B30T-7 is rated for 350 mW versus 300 mW for CMOZ30V BK. This 50 mW additional capacity provides thermal margin and allows operation at higher ambient temperatures or with higher power dissipation without exceeding maximum junction temperature limits.

Q: Does RoHS compliance affect electrical performance?

A: RoHS3 compliance of BZT585B30T-7 does not alter electrical performance. Compliance indicates manufacturing process restrictions on hazardous substances. Selection based on compliance is a supply chain and regulatory requirement, not an electrical performance factor.

Q: Can these parts be used interchangeably in existing designs?

A: Electrical interchangeability is confirmed for applications operating within 150°C maximum temperature. Verify that circuit design does not depend on the extended temperature range of CMOZ30V BK. PCB layout compatibility is confirmed due to identical SOD-523 package dimensions.

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