CZRT55C24-G Zener Diode 24V 350mW SOT-23-3 Equivalent & Substitute Parts

Part Overview

The CZRT55C24-G is a 24V Zener diode manufactured by Comchip Technology, rated for 350mW power dissipation in a surface mount SOT-23-3 package. This component is classified as Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1). The part operates across a temperature range of -65°C to 150°C with ±6% voltage tolerance and is suitable for voltage regulation and protection applications in electronic circuits. Equivalent and substitute parts are identified based on matching electrical specifications including nominal Zener voltage, power rating, package type, and operating temperature range.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	24	V
Power - Max	350	mW
Tolerance	±6%	-
Impedance (Max)	70	Ohms
Current - Reverse Leakage @ Vr	100	nA @ 16.8V
Voltage - Forward (Vf) (Max) @ If	900	mV @ 10mA
Operating Temperature	-65 to 150	°C
Package / Case	SOT-23-3	-
Mounting Type	Surface Mount	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the CZRT55C24-G is determined by the following critical parameters:

Primary Matching Criteria:

Nominal Zener voltage: 24V (exact match required)
Package type: SOT-23-3 surface mount (mechanical and thermal compatibility)
Operating temperature range: -65°C to 150°C minimum
Power rating: 350mW or higher (derating acceptable)
Mounting type: Surface Mount

Secondary Compatibility Factors:

Voltage tolerance: ±6% or tighter acceptable
Impedance (Max): 70 Ohms or lower acceptable
Reverse leakage current: 100nA @ 16.8V or lower acceptable
Forward voltage: 900mV @ 10mA or lower acceptable
RoHS3 compliance and MSL 1 rating required

Substitute parts are grouped into two categories based on power rating alignment: 300mW rated parts (lower power dissipation capability) and 350mW rated parts (equivalent power handling).

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Power (Max)	Tolerance	Zzt (Max)	Temp Range	Package	AEC-Q101
CZRT55C24-G	Comchip Technology	24V	350mW	±6%	70Ω	-65 to 150°C	SOT-23-3	-
BZX84B24-7-F	Diodes Incorporated	24V	300mW	±2%	70Ω	-65 to 150°C	SOT-23-3	-
BZX84B24Q-7-F	Diodes Incorporated	24V	300mW	±2%	70Ω	-65 to 150°C	SOT-23-3	Yes
BZX84C24-7-F	Diodes Incorporated	24V	300mW	±6%	70Ω	-65 to 150°C	SOT-23-3	Yes
BZX84C24-TP	Micro Commercial Co	24V	350mW	±5%	70Ω	-55 to 150°C	SOT-23-3	-
DDZX24C-13	Diodes Incorporated	24V	300mW	±3%	35Ω	-65 to 150°C	SOT-23-3	-
DDZX24C-7	Diodes Incorporated	24V	300mW	±3%	35Ω	-65 to 150°C	SOT-23-3	-
MMBZ5252B-7-F	Diodes Incorporated	24V	350mW	±5%	33Ω	-65 to 150°C	SOT-23-3	-
MMBZ5252B-TP	Micro Commercial Co	24V	350mW	±5%	33Ω	-55 to 150°C	SOT-23-3	-
MMBZ5252BQ-7-F	Diodes Incorporated	24V	350mW	±5%	33Ω	-65 to 150°C	SOT-23-3	Yes

Engineering Selection Recommendations

Direct Equivalents (350mW Power Rating):

The MMBZ5252B-7-F, MMBZ5252B-TP, and MMBZ5252BQ-7-F provide equivalent power handling to the CZRT55C24-G with improved impedance characteristics (33Ω vs 70Ω). All three maintain the 24V nominal Zener voltage and SOT-23-3 package. The MMBZ5252BQ-7-F includes AEC-Q101 automotive qualification and operates across the full -65°C to 150°C temperature range, making it suitable for applications requiring automotive-grade reliability.

The BZX84C24-TP from Micro Commercial Co matches the 350mW power rating and ±5% tolerance but operates with a reduced lower temperature limit of -55°C. This part is suitable for applications not requiring extended low-temperature operation below -55°C.

Acceptable Substitutes (300mW Power Rating):

The BZX84B24-7-F, BZX84B24Q-7-F, and BZX84C24-7-F from Diodes Incorporated provide 300mW power rating, which is lower than the original 350mW specification. These parts are acceptable substitutes only when circuit design margins permit operation at reduced power dissipation levels. The BZX84B24Q-7-F and BZX84C24-7-F both carry AEC-Q101 automotive qualification.

The DDZX24C-7 and DDZX24C-13 from Diodes Incorporated offer improved impedance performance (35Ω) at 300mW rating. These parts are suitable for applications where lower output impedance is beneficial and power dissipation requirements do not exceed 300mW.

Compliance and Certification:

All listed substitute parts maintain RoHS3 compliance and MSL 1 (unlimited) moisture sensitivity rating, matching the original part's environmental specifications. Parts designated with AEC-Q101 qualification (BZX84B24Q-7-F, BZX84C24-7-F, MMBZ5252BQ-7-F) are suitable for automotive and high-reliability applications.

Frequently Asked Questions (FAQ)

Q: Can I use a 300mW rated Zener diode as a substitute for the 350mW CZRT55C24-G?

A: Yes, provided circuit design analysis confirms that maximum power dissipation does not exceed 300mW under all operating conditions including worst-case scenarios. The 300mW parts (BZX84B24-7-F, BZX84C24-7-F, DDZX24C-7, DDZX24C-13) are electrically compatible but have reduced thermal headroom. Design margin verification is required before implementation.

Q: What is the difference between BZX84B24-7-F and BZX84C24-7-F?

A: Both parts are 24V, 300mW Zener diodes in SOT-23-3 packages from Diodes Incorporated. The primary difference is voltage tolerance: BZX84B24-7-F has ±2% tolerance while BZX84C24-7-F has ±6% tolerance, matching the original CZRT55C24-G specification. The BZX84C24-7-F is the closer tolerance match to the original part.

Q: Are MMBZ5252B-7-F and MMBZ5252B-TP interchangeable?

A: Both parts have identical electrical specifications (24V, 350mW, ±5%, SOT-23-3 package) and are manufactured by different suppliers (Diodes Incorporated vs Micro Commercial Co). The MMBZ5252B-TP has a reduced lower operating temperature limit of -55°C compared to -65°C for MMBZ5252B-7-F. They are interchangeable only in applications not requiring operation below -55°C.

Q: Why do some substitute parts have lower impedance values?

A: Impedance (Zzt) represents the dynamic resistance of the Zener diode. Lower impedance values (33Ω in MMBZ5252 series vs 70Ω in original) indicate better voltage regulation performance and lower output noise. These parts provide superior performance characteristics while maintaining the same 24V nominal voltage and package compatibility.

Q: Which substitute part is recommended for automotive applications?

A: The MMBZ5252BQ-7-F is the recommended choice for automotive applications. It carries AEC-Q101 qualification, maintains the full -65°C to 150°C operating temperature range, provides 350mW power rating matching the original specification, and features improved impedance characteristics (33Ω). The BZX84B24Q-7-F and BZX84C24-7-F are also AEC-Q101 qualified alternatives, though with reduced 300mW power rating.

Q: Is RoHS3 compliance maintained across all substitute parts?

A: Yes. All listed substitute parts maintain RoHS3 compliance and MSL 1 (unlimited) moisture sensitivity rating, ensuring environmental and regulatory compatibility with the original CZRT55C24-G specification.

Q: Can I use DDZX24C-7 instead of MMBZ5252B-7-F?

A: Both are 24V Zener diodes in SOT-23-3 packages with compatible operating temperature ranges. However, DDZX24C-7 is rated for 300mW versus 350mW for MMBZ5252B-7-F. Additionally, DDZX24C-7 has lower impedance (35Ω) and lower reverse leakage current (50nA @ 19V), making it suitable only for applications where power dissipation does not exceed 300mW.

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