CZRT55C27-G Zener Diode 27V 350mW SOT-23-3 Equivalent & Substitute Parts

Part Overview

The CZRT55C27-G is a surface mount Zener diode manufactured by Comchip Technology, rated at 27 V nominal Zener voltage with 350 mW maximum power dissipation in SOT-23-3 package. This component is classified as Active product status with full RoHS3 compliance and unlimited moisture sensitivity level (MSL 1). Equivalent and substitute parts are identified based on matching electrical specifications and mechanical compatibility within the SOT-23-3 form factor. Alternative sources become necessary due to inventory availability, lead time requirements, or supply chain optimization in production environments.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	27	V
Power - Max	350	mW
Tolerance	±7%	-
Impedance (Max)	80	Ohms
Current - Reverse Leakage @ Vr	100	nA @ 18.9 V
Voltage - Forward (Max) @ If	900	mV @ 10 mA
Operating Temperature Range	-65 to 150	°C
Package / Case	SOT-23-3	-
Mounting Type	Surface Mount	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution eligibility for the CZRT55C27-G is determined by the following critical parameters:

Primary Matching Criteria:

Zener voltage (Nom): 27 V (exact match required)
Package / Case: SOT-23-3 (mechanical compatibility)
Mounting Type: Surface Mount (assembly process compatibility)
Operating Temperature Range: -65°C to 150°C (functional envelope)

Secondary Compatibility Parameters:

Power - Max: 350 mW or higher (equal or superior rating)
Tolerance: ±7% or tighter (equal or superior accuracy)
Impedance (Max): 80 Ohms or lower (equal or superior dynamic performance)
Current - Reverse Leakage: 100 nA @ 18.9 V or lower (equal or superior leakage characteristics)
Voltage - Forward (Max): 900 mV @ 10 mA or lower (equal or superior forward characteristics)

Compliance Requirements:

RoHS3 Compliant (mandatory for equivalent parts)
REACH Unaffected status (mandatory for equivalent parts)
Product Status: Active (current manufacturing availability)

Substitute parts are grouped into two categories based on power rating alignment: Group A (350 mW rated) and Group B (300 mW rated). Group A substitutes maintain identical power specifications. Group B substitutes operate at reduced maximum power dissipation and are suitable for applications where the 350 mW rating is not required.

Parameter Comparison

Parameter	CZRT55C27-G	BZX84B27-7-F	BZX84B27Q-7-F	BZX84C27-7-F	DDZX27D-13	DDZX27D-7	MMBZ5254B-7-F
Manufacturer	Comchip Technology	Diodes Incorporated	Diodes Incorporated	Diodes Incorporated	Diodes Incorporated	Diodes Incorporated	Diodes Incorporated
Voltage - Zener (Nom)	27 V	27 V	27 V	27 V	27 V	27 V	27 V
Tolerance	±7%	±2%	±2%	±7%	±3%	±2.5%	±5%
Power - Max	350 mW	300 mW	300 mW	300 mW	300 mW	300 mW	350 mW
Impedance (Max)	80 Ω	80 Ω	80 Ω	80 Ω	45 Ω	45 Ω	41 Ω
Current - Reverse Leakage @ Vr	100 nA @ 18.9 V	100 nA @ 18.9 V	100 nA @ 18.9 V	100 nA @ 18.9 V	50 nA @ 21 V	50 nA @ 21 V	100 nA @ 21 V
Voltage - Forward (Max) @ If	900 mV @ 10 mA	900 mV @ 10 mA	900 mV @ 10 mA	900 mV @ 10 mA	900 mV @ 10 mA	900 mV @ 10 mA	900 mV @ 10 mA
Operating Temperature	-65 to 150°C	-65 to 150°C	-65 to 150°C (TJ)	-65 to 150°C	-65 to 150°C	-65 to 150°C	-65 to 150°C
Package / Case	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected
Product Status	Active	Active	Active	Active	Active	Active	Active
Inventory (Pcs)	721	6200	3110	62100	1105	2995	77245

Engineering Selection Recommendations

Group A - Direct Power Rating Equivalents (350 mW):

MMBZ5254B-7-F is the primary equivalent substitute for CZRT55C27-G. Both components share identical 27 V Zener voltage, 350 mW power rating, and SOT-23-3 package. MMBZ5254B-7-F offers superior impedance performance (41 Ω vs. 80 Ω) and tighter tolerance (±5% vs. ±7%), with significantly higher inventory availability (77,245 pcs). All compliance requirements (RoHS3, REACH Unaffected, Active status) are met. This substitute is suitable for direct replacement in applications where the full 350 mW power budget is utilized.

Group B - Reduced Power Rating Substitutes (300 mW):

BZX84C27-7-F provides tolerance matching (±7%) with CZRT55C27-G while operating at 300 mW maximum power. This substitute is appropriate for applications where power dissipation does not exceed 300 mW. Impedance specification (80 Ω) is identical to the main part. Inventory availability is highest among all substitutes (62,100 pcs). All compliance and product status requirements are satisfied.

BZX84B27-7-F and BZX84B27Q-7-F both operate at 300 mW with superior tolerance (±2%). BZX84B27Q-7-F includes AEC-Q101 automotive qualification and is suitable for automotive-grade applications. Both maintain 80 Ω impedance specification. These substitutes are appropriate for applications requiring tighter voltage tolerance than the original ±7% specification.

DDZX27D-7 and DDZX27D-13 offer superior impedance performance (45 Ω) and lower reverse leakage (50 nA @ 21 V) at 300 mW power rating. DDZX27D-7 provides ±2.5% tolerance. These substitutes are suitable for precision applications where dynamic impedance and leakage characteristics are critical design parameters.

Selection Criteria Summary:

For direct replacement with identical power rating: MMBZ5254B-7-F
For tolerance matching with high availability: BZX84C27-7-F
For automotive applications: BZX84B27Q-7-F
For precision impedance requirements: DDZX27D-7

All recommended substitutes maintain full compliance with RoHS3 and REACH requirements, Active product status, and -65°C to 150°C operating temperature range.

Frequently Asked Questions (FAQ)

Q1: Can MMBZ5254B-7-F be used as a direct replacement for CZRT55C27-G?

A: Yes. MMBZ5254B-7-F is a direct equivalent substitute. Both components have identical 27 V Zener voltage, 350 mW power rating, and SOT-23-3 package configuration. MMBZ5254B-7-F offers superior impedance (41 Ω vs. 80 Ω) and tighter tolerance (±5% vs. ±7%), making it functionally superior for the same application. All compliance certifications match.

Q2: What is the difference between Group A and Group B substitutes?

A: Group A substitutes (MMBZ5254B-7-F) maintain the 350 mW power rating of the original CZRT55C27-G. Group B substitutes (BZX84B27-7-F, BZX84B27Q-7-F, BZX84C27-7-F, DDZX27D-13, DDZX27D-7) operate at 300 mW maximum power. Group B substitutes are suitable only for applications where power dissipation does not exceed 300 mW. If your circuit requires the full 350 mW capability, use Group A substitutes only.

Q3: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are RoHS3 Compliant and REACH Unaffected. The CZRT55C27-G main part is also RoHS3 Compliant. All parts meet current environmental and regulatory requirements for electronic component manufacturing and use.

Q4: Which substitute offers the best impedance performance?

A: MMBZ5254B-7-F offers the lowest impedance at 41 Ω, followed by DDZX27D-7 and DDZX27D-13 at 45 Ω. The original CZRT55C27-G and BZX84 series parts specify 80 Ω maximum impedance. Lower impedance provides superior dynamic performance and faster transient response in voltage regulation applications.

Q5: Can I use BZX84B27Q-7-F in automotive applications?

A: Yes. BZX84B27Q-7-F is qualified to AEC-Q101 automotive standard and is specifically designed for automotive-grade applications. This part is suitable for use in automotive circuits requiring Zener diode functionality with automotive qualification requirements.

Q6: What is the difference between BZX84B27-7-F and BZX84C27-7-F?

A: Both parts operate at 300 mW with identical 80 Ω impedance and SOT-23-3 package. The primary difference is tolerance: BZX84B27-7-F specifies ±2% tolerance, while BZX84C27-7-F specifies ±7% tolerance (matching the original CZRT55C27-G). BZX84C27-7-F is appropriate for applications where ±7% tolerance is acceptable. BZX84B27-7-F is suitable for applications requiring tighter ±2% tolerance.

Q7: Which substitute has the lowest reverse leakage current?

A: DDZX27D-7 and DDZX27D-13 both specify 50 nA reverse leakage @ 21 V, compared to 100 nA @ 18.9 V for the original CZRT55C27-G and most BZX84 series substitutes. Lower reverse leakage is beneficial in precision analog circuits and high-impedance applications.

Q8: Are all substitutes available in Tape & Reel (TR) packaging?

A: Yes. All listed substitute parts are supplied in Tape & Reel (TR) packaging, matching the original CZRT55C27-G packaging format. This ensures compatibility with automated assembly equipment and production processes.

Q9: What is the operating temperature range for all substitutes?

A: All substitute parts operate across the -65°C to 150°C temperature range, matching the original CZRT55C27-G specification. This ensures thermal compatibility in applications requiring extended temperature operation.

Q10: Which substitute has the highest inventory availability?

A: MMBZ5254B-7-F has the highest inventory availability at 77,245 pcs, followed by BZX84C27-7-F at 62,100 pcs. These parts are recommended for applications where supply chain continuity and lead time reduction are priorities.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message