CZRT55C3V3-G Zener Diode 3.3V 350mW SOT-23-3 Equivalent & Substitute Parts

Part Overview

The CZRT55C3V3-G is a 3.3V 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 and is ROHS3 compliant. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, supply chain considerations, or design flexibility needs while maintaining the same functional specifications.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	3.3	V
Power - Max	350	mW
Tolerance	±6%	-
Impedance (Max)	95	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 1V
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 CZRT55C3V3-G is determined by strict equivalence in the following critical parameters:

Primary Equivalence Criteria:

Zener voltage: 3.3V nominal
Package type: SOT-23-3 (TO-236-3, SC-59)
Mounting type: Surface Mount
Operating temperature range: -65°C to 150°C minimum
RoHS3 compliance
Reverse leakage current: 5µA @ 1V
Forward voltage: 900mV @ 10mA maximum

Secondary Compatibility Parameters:

Power rating: 350mW or higher
Tolerance: ±6% or tighter
Impedance: 95 Ohms or lower

All identified substitute parts maintain these electrical and mechanical specifications within the allowed parameter ranges for this product category.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Power (mW)	Tolerance	Zzt (Ohms)	Ir @ 1V (µA)	Vf @ 10mA (mV)	Temp Range (°C)	Package
CZRT55C3V3-G	Comchip Technology	3.3	350	±6%	95	5	900	-65 to 150	SOT-23-3
BZX84B3V3-7-F	Diodes Incorporated	3.3	300	±2%	95	5	900	-65 to 150	SOT-23-3
BZX84B3V3Q-7-F	Diodes Incorporated	3.3	300	±2%	95	5	900	-65 to 150	SOT-23-3
BZX84C3V3-7-F	Diodes Incorporated	3.3	300	±6%	95	5	900	-65 to 150	SOT-23-3
BZX84C3V3-TP	Micro Commercial Co	3.3	350	±5%	83	5	900	-55 to 150	SOT-23-3
MMBZ5226B-7-F	Diodes Incorporated	3.3	350	±5%	28	25	900	-65 to 150	SOT-23-3

Engineering Selection Recommendations

Direct Substitutes (Highest Compatibility):

BZX84C3V3-7-F and BZX84B3V3-7-F from Diodes Incorporated maintain identical electrical specifications to the CZRT55C3V3-G within the critical parameters. Both are Active product status, ROHS3 compliant, and qualified to AEC-Q101 automotive standards. The BZX84C3V3-7-F matches the ±6% tolerance of the original part, while BZX84B3V3-7-F offers improved ±2% tolerance. Power rating reduction from 350mW to 300mW is within acceptable substitution limits for applications not requiring maximum power dissipation.

Equivalent Substitutes (Full Parameter Match):

BZX84C3V3-TP from Micro Commercial Co provides identical 350mW power rating and maintains all critical electrical parameters. Operating temperature minimum is -55°C versus -65°C on the original part. Impedance is 83 Ohms, lower than the 95 Ohm specification, which is acceptable. This part is ROHS3 compliant and Active status.

Specialized Substitute (Automotive Grade):

BZX84B3V3Q-7-F is qualified to AEC-Q101 automotive standards with ±2% tolerance and 300mW power rating. This part is suitable for applications requiring automotive-grade reliability and tighter voltage tolerance specifications.

Alternative Substitute (Different Impedance Characteristics):

MMBZ5226B-7-F from Diodes Incorporated provides 350mW power rating and maintains the 3.3V zener voltage. This part exhibits significantly lower impedance (28 Ohms versus 95 Ohms) and higher reverse leakage current (25µA versus 5µA). Selection of this part requires confirmation that circuit design accommodates these impedance and leakage characteristics.

All substitute parts are ROHS3 compliant, REACH unaffected, and classified as Active product status.

Frequently Asked Questions (FAQ)

Q: Can BZX84B3V3-7-F replace CZRT55C3V3-G in all applications?

A: BZX84B3V3-7-F is electrically equivalent in zener voltage, impedance, reverse leakage, and forward voltage. The power rating is reduced from 350mW to 300mW. Substitution is valid for applications where thermal dissipation does not exceed 300mW. Tolerance is improved to ±2%, which is compatible with ±6% specification requirements.

Q: What is the difference between BZX84C3V3-7-F and BZX84B3V3-7-F?

A: Both parts are manufactured by Diodes Incorporated in SOT-23-3 package with identical electrical performance. BZX84C3V3-7-F has ±6% tolerance matching the original CZRT55C3V3-G. BZX84B3V3-7-F has ±2% tolerance. Power rating is 300mW for both. Selection depends on tolerance requirements of the application.

Q: Why does MMBZ5226B-7-F have different impedance and leakage specifications?

A: MMBZ5226B-7-F is a different zener diode series with different internal characteristics. While it maintains 3.3V zener voltage and 350mW power rating, the impedance is 28 Ohms and reverse leakage is 25µA. This part is suitable only for applications where these characteristics are acceptable or beneficial.

Q: Is BZX84C3V3-TP suitable for -65°C operation?

A: BZX84C3V3-TP is rated for -55°C to 150°C operating temperature. The original CZRT55C3V3-G is rated -65°C to 150°C. If operation below -55°C is required, BZX84C3V3-TP is not suitable. Alternative substitutes with -65°C minimum rating include BZX84B3V3-7-F, BZX84B3V3Q-7-F, or MMBZ5226B-7-F.

Q: Are all substitute parts available in Tape & Reel packaging?

A: BZX84B3V3-7-F, BZX84B3V3Q-7-F, BZX84C3V3-TP, and MMBZ5226B-7-F are all available in Tape & Reel (TR) packaging. BZX84C3V3-7-F is available in Cut Tape (CT) and Digi-Reel packaging. Verify packaging format requirements for your procurement process.

Q: Do all substitute parts meet RoHS3 compliance?

A: All identified substitute parts are ROHS3 compliant and REACH unaffected, matching the compliance status of CZRT55C3V3-G.

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