MMBZ5232B Equivalent & Substitute Parts

Part Overview

The MMBZ5232B is a Zener diode manufactured by onsemi, rated at 5.6 V nominal with 350 mW maximum power dissipation in a surface mount SOT-23-3 package. This part is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and ongoing production requirements. Equivalent parts maintain identical electrical specifications, while substitute parts offer functional alternatives with variations in power rating, tolerance, or impedance characteristics within acceptable operating parameters.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	5.6	V
Tolerance	±5%	—
Power - Max	350	mW
Impedance (Max)	11	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 3 V
Voltage - Forward (Vf) (Max) @ If	900	mV @ 10 mA
Operating Temperature	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—

Substitute Part Grouping Explanation

Substitution of the MMBZ5232B is determined by the following critical parameters:

Primary Matching Criteria:

Zener voltage: 5.6 V nominal
Package type: SOT-23-3 (TO-236-3, SC-59)
Mounting type: Surface Mount
Operating temperature range compatibility

Secondary Compatibility Factors:

Power dissipation rating (350 mW or higher)
Impedance (Zzt) maximum value
Reverse leakage current specifications
Forward voltage characteristics
Tolerance specification (±5% or tighter)

Substitute parts are grouped into three categories based on electrical equivalence:

Direct Equivalents (350 mW, ±5% tolerance): Parts maintaining identical power rating and tolerance specifications.

Functional Equivalents (225 mW, ±5% tolerance): Parts with reduced power dissipation suitable for lower-power applications while maintaining voltage and tolerance specifications.

Enhanced Alternatives (300-350 mW, ±1-2% tolerance): Parts offering improved tolerance or impedance characteristics with comparable or superior power ratings.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Temp Range (°C)	Status	RoHS
MMBZ5232B	onsemi	5.6	±5%	350	11	-55 to 150	Obsolete	—
MMBZ5232BLT1G	onsemi	5.6	±5%	225	11	-65 to 150	Active	ROHS3
SZMMBZ5232BLT1G	onsemi	5.6	±5%	225	11	-65 to 150	Active	ROHS3
CMPZ5232B BK PBFREE	Central Semiconductor Corp	5.6	±5%	350	11	-65 to 150	Active	ROHS3
CMPZ5232B TR PBFREE	Central Semiconductor Corp	5.6	±5%	350	11	-65 to 150	Active	ROHS3
CZRT5232B-HF	Comchip Technology	5.6	±5%	350	12	-65 to 150	Active	ROHS3
MMBZ5232B-7-F	Diodes Incorporated	5.6	±5%	350	11	-65 to 150	Active	ROHS3
MMBZ5232BQ-7-F	Diodes Incorporated	5.6	±5%	350	11	-65 to 150	Active	ROHS3
BZX84-A5V6,215	Nexperia USA Inc.	5.6	±1%	250	40	-65 to 150	Active	ROHS3
BZX84B5V6-7-F	Diodes Incorporated	5.6	±2%	300	40	-65 to 150	Active	ROHS3
BZX84B5V6Q-7-F	Diodes Incorporated	5.6	±2%	300	40	-65 to 150	Active	ROHS3

Engineering Selection Recommendations

Direct Replacement (Identical Specifications):

MMBZ5232B-7-F (Diodes Incorporated) and CMPZ5232B TR PBFREE (Central Semiconductor Corp) are direct functional equivalents, maintaining 5.6 V nominal voltage, ±5% tolerance, 350 mW power rating, and 11 Ohms impedance. Both are active products with ROHS3 compliance. MMBZ5232B-7-F offers higher inventory availability (61,436 units) and extended temperature range (-65°C to 150°C) compared to the original part's -55°C to 150°C specification.

Automotive-Grade Alternatives:

MMBZ5232BQ-7-F (Diodes Incorporated) and SZMMBZ5232BLT1G (onsemi) provide AEC-Q101 automotive qualification with identical electrical specifications to the original part. MMBZ5232BQ-7-F maintains 350 mW power rating, while SZMMBZ5232BLT1G operates at 225 mW. Both support extended temperature operation to -65°C.

Reduced Power Dissipation Option:

MMBZ5232BLT1G (onsemi) operates at 225 mW maximum power with identical voltage and impedance characteristics. This part is suitable for applications where the full 350 mW capability is not required, offering active product status and ROHS3 compliance.

Enhanced Tolerance Alternatives:

BZX84B5V6-7-F and BZX84B5V6Q-7-F (Diodes Incorporated) provide ±2% tolerance with 300 mW power rating. These parts feature higher impedance (40 Ohms) and lower reverse leakage (1 µA @ 2 V), suitable for precision voltage reference applications. BZX84B5V6Q-7-F includes AEC-Q101 automotive qualification.

Precision Reference Option:

BZX84-A5V6,215 (Nexperia USA Inc.) offers ±1% tolerance with AEC-Q101 qualification, suitable for applications requiring tighter voltage regulation. Power rating of 250 mW and impedance of 40 Ohms differ from the original specification.

All recommended substitutes are active products with ROHS3 compliance and REACH unaffected status.

Frequently Asked Questions (FAQ)

Q: Can MMBZ5232BLT1G replace MMBZ5232B in all applications?

A: MMBZ5232BLT1G maintains identical voltage (5.6 V), tolerance (±5%), and impedance (11 Ohms) specifications. The primary difference is reduced power dissipation (225 mW versus 350 mW). Substitution is valid for applications where power dissipation does not exceed 225 mW. Verify circuit power requirements before selection.

Q: What is the difference between CMPZ5232B BK PBFREE and CMPZ5232B TR PBFREE?

A: Both parts are manufactured by Central Semiconductor Corp with identical electrical specifications (5.6 V, ±5%, 350 mW, 11 Ohms). The difference is packaging: BK PBFREE is supplied in bulk, while TR PBFREE is supplied in tape and reel format. Electrical performance is equivalent; selection depends on procurement and assembly requirements.

Q: Why do BZX84B5V6-7-F and BZX84B5V6Q-7-F have higher impedance (40 Ohms) than the original part (11 Ohms)?

A: Higher impedance values indicate different internal design characteristics. These parts are suitable for precision voltage reference applications where tighter tolerance (±2%) is required. The impedance difference affects dynamic response in high-frequency applications. Verify circuit requirements for impedance compatibility.

Q: Is SZMMBZ5232BLT1G suitable for automotive applications?

A: Yes. SZMMBZ5232BLT1G carries AEC-Q101 automotive qualification and is rated for -65°C to 150°C operation. It maintains 5.6 V nominal voltage and ±5% tolerance with 225 mW power dissipation. This part is appropriate for automotive designs requiring qualified components.

Q: What is the temperature range difference between MMBZ5232B and its active equivalents?

A: The original MMBZ5232B operates from -55°C to 150°C. Most active equivalents extend the lower temperature limit to -65°C, providing broader operational range. This extended range does not affect substitution validity; circuits designed for -55°C to 150°C operation remain compatible with -65°C to 150°C parts.

Q: Can MMBZ5232BQ-7-F be used in non-automotive applications?

A: Yes. MMBZ5232BQ-7-F is AEC-Q101 qualified but not restricted to automotive use. It maintains 5.6 V nominal voltage, ±5% tolerance, 350 mW power rating, and 11 Ohms impedance. Automotive qualification indicates enhanced reliability and process control; the part is suitable for general industrial and consumer applications.

Q: What packaging options are available for 5.6 V 350 mW Zener diodes?

A: All listed equivalents use SOT-23-3 (TO-236-3, SC-59) surface mount packaging. Packaging variations exist in supply format: cut tape (CT), digi-reel, tape and reel (TR), and bulk. Electrical performance is identical across packaging formats; selection depends on assembly equipment and procurement requirements.

Q: Is CZRT5232B-HF a direct replacement for MMBZ5232B?

A: CZRT5232B-HF (Comchip Technology) maintains 5.6 V nominal voltage, ±5% tolerance, and 350 mW power rating. Impedance is 12 Ohms versus 11 Ohms for the original part. This 1 Ohm difference is within typical manufacturing tolerance and does not affect functional compatibility. The part is active with ROHS3 compliance.

Q: Why is the original MMBZ5232B marked as obsolete?

A: Product obsolescence reflects manufacturer discontinuation decisions. Active equivalents from onsemi (MMBZ5232BLT1G, SZMMBZ5232BLT1G) and other manufacturers (CMPZ5232B, MMBZ5232B-7-F) provide functional alternatives with current production status and improved compliance certifications.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message