CMPZ5233B BK PBFREE Equivalent & Substitute Parts

Part Overview

The CMPZ5233B BK PBFREE is a Zener diode manufactured by Central Semiconductor Corp, rated at 6 V nominal voltage with 350 mW maximum power dissipation. This surface mount component in SOT-23 packaging is designed for voltage regulation and protection applications in electronic circuits. The part maintains Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Substitute parts are identified to provide design flexibility for procurement, inventory management, and application-specific requirements while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	6	V
Tolerance	±5%	—
Power - Max	350	mW
Impedance (Max)	7	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 3.5 V
Voltage - Forward (Vf) (Max) @ If	900	mV @ 10 mA
Operating Temperature Range	-65 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	SOT-23-3	—
RoHS Status	ROHS3 Compliant	—
MSL Rating	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution eligibility for the CMPZ5233B BK PBFREE is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - Zener (Nom): 6 V (exact match required)
Tolerance: ±5% (exact match required)
Impedance (Max): 7 Ohms (exact match required)
Current - Reverse Leakage @ Vr: 5 µA @ 3.5 V (exact match required)
Voltage - Forward (Vf) (Max) @ If: 900 mV @ 10 mA (exact match required)
Operating Temperature Range: -65°C to 150°C (exact match required)
Package / Case: SOT-23-3 compatible (exact match required)
RoHS3 Compliance: Required
MSL Rating: 1 (Unlimited) (exact match required)

Secondary Consideration:

Power - Max: 350 mW (primary specification); substitutes with equal or greater power rating are acceptable

Substitute parts are grouped into two categories:

Category A - Direct Electrical & Mechanical Equivalents (350 mW):

MMBZ5233B-7-F (Diodes Incorporated)

Category B - Functionally Compatible with Reduced Power Rating (225 mW or 200 mW):

MMBZ5233BLT1G (onsemi)
SZMMBZ5233BLT1G (onsemi, AEC-Q101 Automotive Grade)
MMBZ5233BTS-7-F (Diodes Incorporated, SOT-363 Array Configuration)

Parameter Comparison

Parameter	CMPZ5233B BK PBFREE	MMBZ5233B-7-F	MMBZ5233BLT1G	SZMMBZ5233BLT1G	MMBZ5233BTS-7-F
Manufacturer	Central Semiconductor Corp	Diodes Incorporated	onsemi	onsemi	Diodes Incorporated
Voltage - Zener (Nom)	6 V	6 V	6 V	6 V	6 V
Tolerance	±5%	±5%	±5%	±5%	±5%
Power - Max	350 mW	350 mW	225 mW	225 mW	200 mW
Impedance (Max)	7 Ohms	7 Ohms	7 Ohms	7 Ohms	7 Ohms
Current - Reverse Leakage @ Vr	5 µA @ 3.5 V	5 µA @ 3.5 V	5 µA @ 3.5 V	5 µA @ 3.5 V	5 µA @ 3.5 V
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA	900 mV @ 10 mA	900 mV @ 10 mA	900 mV @ 10 mA	900 mV @ 10 mA
Operating Temperature	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3	SOT-363
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active	Active	Active
Automotive Grade	—	—	—	AEC-Q101	—

Engineering Selection Recommendations

For Direct Replacement (Pin-Compatible, Identical Power Rating):

MMBZ5233B-7-F from Diodes Incorporated is the primary direct substitute. This part maintains identical electrical specifications (6 V, 350 mW, ±5% tolerance) and SOT-23-3 package compatibility. Both parts are Active status with ROHS3 compliance and unlimited MSL rating. Selection of this substitute is appropriate when procurement source diversification or inventory availability is the primary driver.

For Functionally Compatible Applications (Reduced Power Dissipation):

MMBZ5233BLT1G and SZMMBZ5233BLT1G from onsemi are functionally compatible substitutes with reduced maximum power rating (225 mW versus 350 mW). These parts maintain all critical electrical parameters: 6 V nominal voltage, ±5% tolerance, 7 Ohms impedance, and identical reverse leakage and forward voltage characteristics. Both are Active status with ROHS3 compliance. SZMMBZ5233BLT1G carries AEC-Q101 automotive qualification, making it suitable for automotive applications requiring this certification.

For Array Configuration Applications:

MMBZ5233BTS-7-F from Diodes Incorporated is a 3-independent Zener diode array in SOT-363 package. This part is suitable only for applications requiring multiple independent 6 V Zener functions in a single package. The reduced power rating per diode (200 mW) reflects the array configuration. This substitute is not pin-compatible with the single-diode SOT-23-3 package and requires circuit redesign.

Selection Basis:

All substitutes maintain Active product status
All substitutes are ROHS3 compliant
All substitutes maintain MSL 1 (Unlimited) rating
Electrical parameter matching is exact across all substitutes for the critical specifications: voltage, tolerance, impedance, leakage, and forward voltage
Package compatibility determines mechanical interchangeability

Frequently Asked Questions (FAQ)

Q: Can MMBZ5233BLT1G replace CMPZ5233B BK PBFREE in all applications?

A: MMBZ5233BLT1G is electrically compatible for voltage regulation and protection functions. The primary difference is maximum power dissipation: 225 mW versus 350 mW. Substitution is valid when circuit power dissipation requirements do not exceed 225 mW. Applications requiring the full 350 mW capability must use MMBZ5233B-7-F or retain the original CMPZ5233B BK PBFREE.

Q: Are MMBZ5233BLT1G and SZMMBZ5233BLT1G interchangeable?

A: Both parts are electrically and mechanically identical with matching 6 V voltage, ±5% tolerance, 225 mW power rating, and SOT-23-3 packaging. The distinction is that SZMMBZ5233BLT1G carries AEC-Q101 automotive qualification. Selection between them depends on whether automotive-grade certification is required for the application.

Q: Why is MMBZ5233BTS-7-F listed as a substitute if it uses SOT-363 packaging?

A: MMBZ5233BTS-7-F is functionally equivalent in electrical specifications but not pin-compatible due to its SOT-363 array package. This part is listed as a substitute only for applications that can accommodate a 3-independent Zener diode array configuration. Direct PCB substitution without circuit redesign is not possible.

Q: What does the ±5% tolerance mean for the 6 V Zener voltage?

A: The ±5% tolerance indicates that the actual Zener voltage will fall within the range of 5.7 V to 6.3 V. All listed substitutes maintain this identical tolerance specification, ensuring consistent voltage regulation performance across all equivalent parts.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. CMPZ5233B BK PBFREE and all listed substitutes (MMBZ5233B-7-F, MMBZ5233BLT1G, SZMMBZ5233BLT1G, and MMBZ5233BTS-7-F) are ROHS3 compliant. All parts are also REACH unaffected and carry EAR99 ECCN classification.

Q: What is the significance of MSL 1 (Unlimited) rating?

A: MSL 1 (Unlimited) indicates that the component has unlimited shelf life and does not require special moisture-controlled storage or handling. This rating applies to all listed parts, simplifying inventory management and reducing storage constraints.

Q: Can I use MMBZ5233B-7-F as a drop-in replacement without PCB modification?

A: Yes. MMBZ5233B-7-F maintains identical SOT-23-3 packaging and pin configuration as CMPZ5233B BK PBFREE. Electrical specifications are identical (6 V, 350 mW, ±5% tolerance). Direct PCB substitution is possible without circuit redesign.

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