CZRT55C11-G Zener Diode 11V 350mW SOT-23-3 Equivalent & Substitute Parts

Part Overview

The CZRT55C11-G is an 11V 350mW Zener diode manufactured by Comchip Technology in SOT-23-3 surface mount packaging. This component is classified as Active product status and is ROHS3 compliant. Equivalent and substitute parts are identified when design requirements necessitate alternative sourcing due to inventory constraints, supply chain considerations, or specific performance tolerance requirements while maintaining functional compatibility within the same electrical and mechanical parameter envelope.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	11	V
Tolerance	±5%	-
Power - Max	350	mW
Impedance (Max)	20	Ohms
Current - Reverse Leakage @ Vr	100 nA @ 8 V	-
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA	-
Operating Temperature	-65°C ~ 150°C	-
Package / Case	TO-236-3, SC-59, SOT-23-3	-
Mounting Type	Surface Mount	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the CZRT55C11-G is determined by strict equivalence across the following critical parameters:

Primary Equivalence Criteria:

Zener voltage: 11V nominal
Power dissipation: 350mW maximum
Tolerance: ±5%
Package: SOT-23-3 (TO-236-3, SC-59)
Mounting: Surface Mount
Operating temperature range: -65°C to 150°C minimum
Compliance: ROHS3, REACH Unaffected, EAR99

Substitution Categories:

Category 1 - Direct Electrical Equivalents (±5% Tolerance, 350mW): Parts that match all primary criteria including tolerance specification and power rating.

Category 2 - Tighter Tolerance Variants (±2% Tolerance, 350mW or 300mW): Parts with improved voltage tolerance (±2%) that provide enhanced precision. These are functionally compatible where tighter regulation is beneficial. Power rating may be 300mW or 350mW.

Category 3 - Automotive Grade Variants (±2% Tolerance, 300mW): Parts qualified to AEC-Q101 automotive standard with tighter tolerance and reduced power rating. Compatible for applications requiring automotive qualification.

All substitute parts maintain identical package geometry, mounting type, and thermal operating range compatibility with the main part.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (Nom)	Tolerance	Power Max	Zzt (Max)	Reverse Leakage @ Vr	Vf (Max) @ If	Temp Range	Grade
CZRT55C11-G	Comchip Technology	11 V	±5%	350 mW	20 Ω	100 nA @ 8 V	900 mV @ 10 mA	-65°C ~ 150°C	Standard
CMPZ5241B TR PBFREE	Central Semiconductor Corp	11 V	±5%	350 mW	22 Ω	2 µA @ 8.4 V	900 mV @ 10 mA	-65°C ~ 150°C	Standard
MMBZ5241B-7-F	Diodes Incorporated	11 V	±5%	350 mW	22 Ω	2 µA @ 8.4 V	900 mV @ 10 mA	-65°C ~ 150°C	Standard
BZX84B11-7-F	Diodes Incorporated	11 V	±2%	350 mW	20 Ω	100 nA @ 8 V	900 mV @ 10 mA	-65°C ~ 150°C	Standard
BZX84B11-TP	Micro Commercial Co	11 V	±2%	350 mW	20 Ω	100 nA @ 8 V	900 mV @ 10 mA	-55°C ~ 150°C	Standard
BZX84B11Q-7-F	Diodes Incorporated	11 V	±2%	300 mW	20 Ω	100 nA @ 8 V	900 mV @ 10 mA	-65°C ~ 150°C	Automotive (AEC-Q101)
BZX84C11-7-F	Diodes Incorporated	11 V	±5%	300 mW	20 Ω	100 nA @ 8 V	900 mV @ 10 mA	-65°C ~ 150°C	Standard
BZX84C11-TP	Micro Commercial Co	11 V	±5%	350 mW	20 Ω	100 nA @ 8 V	900 mV @ 10 mA	-55°C ~ 150°C	Standard

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications):

CMPZ5241B TR PBFREE and MMBZ5241B-7-F are direct functional equivalents to CZRT55C11-G, maintaining ±5% tolerance and 350mW power rating. Both are Active product status and ROHS3 compliant. Selection between these and the main part is based on inventory availability and supply chain requirements.

For Enhanced Voltage Regulation:

BZX84B11-7-F and BZX84B11-TP provide tighter ±2% voltage tolerance while maintaining 350mW power rating and identical electrical characteristics. These are suitable when improved voltage regulation precision is required. BZX84B11-7-F maintains the full -65°C to 150°C temperature range; BZX84B11-TP operates from -55°C to 150°C.

For Automotive Applications:

BZX84B11Q-7-F is qualified to AEC-Q101 automotive standard with ±2% tolerance. Power rating is 300mW. This part is appropriate for automotive-grade circuit designs requiring certification compliance.

For Reduced Power Dissipation:

BZX84C11-7-F provides 300mW power rating with ±5% tolerance matching the main part's voltage specification. This is suitable for applications where lower power dissipation is beneficial. BZX84C11-TP offers the same 300mW rating with ±5% tolerance and -55°C to 150°C operating range.

All substitute parts maintain SOT-23-3 package compatibility and surface mount mounting type. Product status is Active for all listed alternatives.

Frequently Asked Questions (FAQ)

Q: Can CMPZ5241B TR PBFREE be used as a direct replacement for CZRT55C11-G?

A: Yes. Both parts specify 11V nominal Zener voltage, ±5% tolerance, 350mW power rating, SOT-23-3 package, and -65°C to 150°C operating temperature range. Electrical and mechanical compatibility is established. The primary difference is impedance specification (22Ω vs 20Ω maximum) and reverse leakage characteristics, which do not prevent substitution within the same application envelope.

Q: What is the difference between BZX84B11-7-F and BZX84C11-7-F?

A: Both parts are manufactured by Diodes Incorporated in SOT-23-3 package. BZX84B11-7-F specifies ±2% voltage tolerance and 350mW power rating. BZX84C11-7-F specifies ±5% voltage tolerance and 300mW power rating. Selection depends on whether tighter voltage regulation or higher power dissipation capability is required for the application.

Q: Is BZX84B11-TP compatible with BZX84B11-7-F?

A: Both parts specify 11V nominal voltage, ±2% tolerance, 350mW power rating, and SOT-23-3 package. The primary difference is operating temperature range: BZX84B11-7-F operates -65°C to 150°C while BZX84B11-TP operates -55°C to 150°C. For applications requiring full -65°C operation, BZX84B11-7-F is required. For applications limited to -55°C minimum, both are functionally equivalent.

Q: Can BZX84B11Q-7-F replace CZRT55C11-G in non-automotive applications?

A: BZX84B11Q-7-F is electrically compatible with CZRT55C11-G for voltage regulation function. However, power rating differs: BZX84B11Q-7-F is rated 300mW versus CZRT55C11-G at 350mW. Substitution is valid only if circuit power dissipation does not exceed 300mW. The part's automotive qualification (AEC-Q101) does not restrict use in non-automotive applications.

Q: What does ±2% tolerance mean compared to ±5%?

A: Tolerance specifies the allowable deviation from nominal Zener voltage. ±2% tolerance provides tighter voltage regulation (narrower acceptable range) compared to ±5% tolerance. For an 11V Zener: ±5% allows 10.45V to 11.55V range; ±2% allows 10.78V to 11.22V range. Tighter tolerance is beneficial for precision voltage reference applications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts specify ROHS3 compliance and REACH Unaffected status, matching the main part CZRT55C11-G compliance profile.

Q: Does package designation SOT-23-3 guarantee mechanical interchangeability?

A: Yes. All parts listed specify SOT-23-3 package (also designated TO-236-3 or SC-59). This ensures identical lead pitch, body dimensions, and PCB footprint compatibility. Surface mount mounting type is consistent across all parts.

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