MMBZ5232B-7 Zener Diode Equivalent & Substitute Parts

Part Overview

The MMBZ5232B-7 is a 5.6 V zener diode manufactured by Diodes Incorporated, rated for 350 mW power dissipation in a surface mount SOT-23-3 package. This part is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design requirements and production needs. Equivalent parts maintain identical electrical specifications, while substitute parts provide functional alternatives with acceptable parameter variations for zener diode applications.

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	-65 to 150	°C
Mounting Type	Surface Mount
Package / Case	TO-236-3, SC-59, SOT-23-3

Substitute Part Grouping Explanation

Substitution of zener diodes is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage (Vz) nominal value
Power dissipation rating (Pmax)
Package compatibility (SOT-23-3 / TO-236-3 / SC-59)
Voltage tolerance
Operating temperature range
Impedance characteristics

Substitution Categories:

Parametric Equivalents maintain all electrical specifications and package type, differing only in packaging format (tape & reel vs. bulk) or manufacturer variant. These are direct replacements.

Manufacturer Recommended Substitutes provide the same zener voltage (5.6 V) and power rating (350 mW) with compatible packages, though may vary in impedance, tolerance, or temperature range within acceptable limits for the application.

Functional Alternatives maintain 5.6 V zener voltage and SOT-23-3 package compatibility but may have reduced power ratings (225 mW, 250 mW) or different impedance values. These are suitable for applications where the full 350 mW rating is not required.

Cross-Manufacturer Options include parts from Nexperia, Micro Commercial Co, Panjit International, and onsemi that meet the core electrical requirements while offering different compliance certifications or automotive qualifications.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Pmax (mW)	Zzt (Ohms)	Package	Temp Range (°C)	Status	RoHS
MMBZ5232B-7	Diodes Inc.	5.6	±5%	350	11	SOT-23-3	-65 to 150	Discontinued	Non-compliant
MMBZ5232B-7-F	Diodes Inc.	5.6	±5%	350	11	SOT-23-3	-65 to 150	Active	ROHS3
MMBZ5232B-TP	Micro Commercial Co	5.6	±5%	350	11	SOT-23	-55 to 150	Active	ROHS3
MMBZ5232B_R1_00001	Panjit International	5.6	±5%	410	11	SOT-23	-55 to 150	Active	ROHS3
MMBZ5232BLT1G	onsemi	5.6	±5%	225	11	SOT-23-3	-65 to 150	Active	ROHS3
SZMMBZ5232BLT1G	onsemi	5.6	±5%	225	11	SOT-23-3	-65 to 150	Active	ROHS3
BZX84C5V6-TP	Micro Commercial Co	5.6	±5%	350	40	SOT-23	-55 to 150	Active	ROHS3
BZX84-A5V6,215	Nexperia USA Inc.	5.6	±1%	250	40	TO-236AB	-65 to 150	Active	ROHS3
PLVA656A,215	Nexperia USA Inc.	5.6	±4%	250	100	TO-236AB	-65 to 150	Active	ROHS3
MMBZ5231B-7-F	Diodes Inc.	5.1	±5%	350	17	SOT-23-3	-65 to 150	Active	ROHS3
BZX84C5V1W-7-F	Diodes Inc.	5.1	±6%	200	60	SOT-323	-65 to 125	Active	ROHS3

Engineering Selection Recommendations

Direct Replacement (Parametric Equivalent):

MMBZ5232B-7-F is the primary equivalent, manufactured by Diodes Incorporated with identical electrical specifications and package designation. This part is currently active and ROHS3 compliant, providing a direct substitution path for the discontinued MMBZ5232B-7.

Primary Substitutes (5.6 V, 350 mW Rating):

MMBZ5232B-TP (Micro Commercial Co) and BZX84C5V6-TP (Micro Commercial Co) maintain the 5.6 V nominal voltage and 350 mW power rating in compatible SOT-23 packages. Both are ROHS3 compliant and active. The MMBZ5232B-TP preserves the 11 Ohm impedance characteristic of the original part, while BZX84C5V6-TP exhibits 40 Ohm impedance.

MMBZ5232B_R1_00001 (Panjit International) offers enhanced power dissipation at 410 mW with identical impedance and voltage specifications, suitable for applications requiring additional thermal margin.

Automotive-Qualified Alternatives:

BZX84-A5V6,215 and PLVA656A,215 (both Nexperia USA Inc.) are AEC-Q101 qualified automotive-grade components with 5.6 V zener voltage. These parts are rated for 250 mW power dissipation and feature superior voltage tolerance (±1% and ±4% respectively). These are appropriate for automotive and mission-critical applications.

Lower Power Alternatives (5.6 V, 225 mW Rating):

MMBZ5232BLT1G and SZMMBZ5232BLT1G (both onsemi) provide 5.6 V zener voltage with 225 mW power rating in SOT-23-3 packages. SZMMBZ5232BLT1G includes AEC-Q101 automotive qualification. These parts are suitable for applications where the full 350 mW rating is not required, offering cost optimization.

Alternative Voltage Options:

MMBZ5231B-7-F (Diodes Incorporated) and BZX84C5V1W-7-F (Diodes Incorporated) provide 5.1 V zener voltage as functional alternatives for applications tolerant of lower voltage regulation. Both are ROHS3 compliant and active.

Frequently Asked Questions (FAQ)

Q: Can MMBZ5232B-7-F be used as a direct replacement for MMBZ5232B-7?

A: Yes. MMBZ5232B-7-F is a parametric equivalent manufactured by Diodes Incorporated with identical zener voltage (5.6 V), power rating (350 mW), impedance (11 Ohms), and package type (SOT-23-3). The primary difference is packaging format (tape & reel) and ROHS3 compliance status.

Q: What is the difference between MMBZ5232BLT1G and SZMMBZ5232BLT1G?

A: Both parts are manufactured by onsemi with identical electrical specifications: 5.6 V zener voltage, 225 mW power rating, and SOT-23-3 package. SZMMBZ5232BLT1G includes AEC-Q101 automotive qualification, making it suitable for automotive applications. MMBZ5232BLT1G is available in Cut Tape & Digi-Reel packaging, while SZMMBZ5232BLT1G is supplied in Tape & Reel format.

Q: Can I use a 5.1 V zener diode (MMBZ5231B-7-F) instead of a 5.6 V part?

A: MMBZ5231B-7-F is a functional alternative only if the application circuit tolerates a 0.5 V lower regulation voltage. This part maintains the 350 mW power rating and SOT-23-3 package compatibility but is not a direct substitute due to the voltage difference.

Q: What are the package compatibility considerations?

A: The original MMBZ5232B-7 uses SOT-23-3 package (also designated TO-236-3 or SC-59). Most substitutes maintain this package type. BZX84-A5V6,215 and PLVA656A,215 use TO-236AB designation, which is mechanically compatible with SOT-23-3 footprints. BZX84C5V1W-7-F uses SOT-323 package, which has different pin spacing and is not footprint compatible.

Q: Why do some substitutes have lower power ratings (225 mW vs. 350 mW)?

A: MMBZ5232BLT1G and SZMMBZ5232BLT1G are designed for applications where full 350 mW dissipation is not required. These parts maintain identical zener voltage and impedance characteristics while reducing thermal requirements and cost. They are suitable for lower-power circuit implementations.

Q: What is the significance of impedance (Zzt) differences?

A: Impedance affects voltage regulation stability and transient response. The original part specifies 11 Ohms. Substitutes with higher impedance values (40 Ohms, 60 Ohms, 100 Ohms) may exhibit different dynamic regulation characteristics. For applications sensitive to voltage ripple or transient response, impedance matching is important.

Q: Are all substitute parts ROHS3 compliant?

A: All listed substitute parts are ROHS3 compliant. The original MMBZ5232B-7 is RoHS non-compliant. MMBZ5232B-7-F provides the compliant equivalent from the same manufacturer.

Q: Which substitute offers the best voltage tolerance?

A: BZX84-A5V6,215 (Nexperia) offers ±1% voltage tolerance, superior to the original part's ±5% tolerance. This provides tighter voltage regulation for precision applications. PLVA656A,215 offers ±4% tolerance as a middle ground.

Q: Can automotive-qualified parts be used in non-automotive applications?

A: Yes. Automotive-qualified parts (BZX84-A5V6,215, PLVA656A,215, SZMMBZ5232BLT1G) meet or exceed standard industrial specifications and are suitable for any application. Automotive qualification indicates enhanced reliability and stricter manufacturing controls.

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