MM5Z30VT1G Zener Diode Equivalent & Substitute Parts

Part Overview

The MM5Z30VT1G is a 30 V, 500 mW Zener diode manufactured by onsemi in SOD-523 surface mount package. This part is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and production continuity. The device operates across a temperature range of -65°C to 150°C with ±6.7% voltage tolerance and is suitable for voltage regulation and protection applications in surface mount assemblies.

Key Parameters

Parameter	Value
Voltage - Zener (Nom)	30 V
Power - Max	500 mW
Tolerance	±6.7%
Impedance (Max)	80 Ohms
Current - Reverse Leakage @ Vr	50 nA @ 21 V
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA
Operating Temperature	-65°C ~ 150°C
Mounting Type	Surface Mount
Package / Case	SC-79, SOD-523
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the MM5Z30VT1G is determined by the following critical parameters: nominal Zener voltage (30 V), maximum power dissipation capability, voltage tolerance, impedance characteristics, reverse leakage current, and operating temperature range. Substitute parts must maintain the 30 V nominal Zener voltage specification. Power rating, package type, and tolerance are secondary considerations that determine functional equivalence and application suitability.

The substitute parts are grouped into two categories:

Parametric Equivalent (Direct Replacement): SZMM5Z30VT1G maintains identical electrical specifications and SOD-523 packaging, differing only in product status (active) and packaging format (Tape & Reel).

Similar Functional Equivalents: Parts with 30 V Zener voltage but variations in power rating, package type, tolerance, or impedance. These require application-level verification of power dissipation requirements and board layout compatibility.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Power (Max)	Tolerance	Zzt (Max)	Package	Status	Grade
MM5Z30VT1G	onsemi	30 V	500 mW	±6.7%	80 Ohms	SOD-523	Obsolete	Standard
SZMM5Z30VT1G	onsemi	30 V	500 mW	±6.7%	80 Ohms	SOD-523	Active	Automotive
BZT52H-C30,115	NXP Semiconductors	30 V	375 mW	±5%	40 Ohms	SOD-123F	Active	Automotive
BZX585-B30,115	Nexperia USA Inc.	30 V	300 mW	±2%	80 Ohms	SOD-523	Active	Automotive
BZX585-C30,115	Nexperia USA Inc.	30 V	300 mW	±5%	80 Ohms	SOD-523	Active	Automotive
BZX84J-B30,115	Nexperia USA Inc.	30 V	550 mW	±2%	40 Ohms	SOD-323F	Active	Automotive
BZX84J-C30,115	Nexperia USA Inc.	30 V	550 mW	±5%	40 Ohms	SOD-323F	Active	Automotive
CZRU52C30	Comchip Technology	30 V	150 mW	±5%	80 Ohms	0603/SOD-523F	Active	Standard
CZRUR52C30	Comchip Technology	30 V	150 mW	±5%	80 Ohms	0603/SOD-523F	Active	Standard
PZU30B,115	Nexperia USA Inc.	30 V	310 mW	±5%	40 Ohms	SOD-323F	Active	Automotive

Engineering Selection Recommendations

Primary Recommendation: SZMM5Z30VT1G is the direct parametric equivalent to MM5Z30VT1G. This part maintains identical electrical specifications, SOD-523 packaging, and operating temperature range. The primary difference is product status (active versus obsolete) and packaging format (Tape & Reel). This part carries automotive-grade qualification (AEC-Q101) and RoHS3 compliance, making it suitable for both commercial and automotive applications.

Secondary Recommendations for Power-Constrained Applications: BZX585-B30,115 and BZX585-C30,115 provide active alternatives in SOD-523 packaging with identical impedance (80 Ohms) but reduced power rating (300 mW). These parts are suitable for applications where the full 500 mW power dissipation is not required. Both carry automotive qualification (AEC-Q100) and RoHS3 compliance.

Alternative for Higher Power Dissipation: BZX84J-B30,115 and BZX84J-C30,115 offer 550 mW power rating, exceeding the original specification. These parts use SOD-323F packaging and feature lower impedance (40 Ohms). Both carry automotive qualification (AEC-Q101) and RoHS3 compliance. Board layout modification is required due to different package footprint.

Low-Power Alternatives: CZRU52C30 and CZRUR52C30 provide 150 mW power rating in 0603/SOD-523F packaging. These parts are suitable only for applications with minimal power dissipation requirements and operate across a narrower temperature range (-55°C to 125°C).

Package-Specific Consideration: PZU30B,115 offers 310 mW in SOD-323F packaging with automotive qualification (AEC-Q100) and lower impedance (40 Ohms). This part requires PCB layout modification due to different package footprint.

Frequently Asked Questions (FAQ)

Q: Can SZMM5Z30VT1G directly replace MM5Z30VT1G without design changes?

A: Yes. SZMM5Z30VT1G is a parametric equivalent with identical electrical specifications (30 V, 500 mW, ±6.7%, 80 Ohms impedance) and SOD-523 packaging. The only differences are product status (active) and packaging format (Tape & Reel). No circuit or PCB modifications are required.

Q: What is the difference between BZX585-B30,115 and BZX585-C30,115?

A: Both parts share identical electrical specifications except for voltage tolerance. BZX585-B30,115 has ±2% tolerance, while BZX585-C30,115 has ±5% tolerance. Both provide 300 mW power rating in SOD-523 packaging. Selection depends on tolerance requirements for the application.

Q: Can I use BZX84J-C30,115 as a direct replacement for MM5Z30VT1G?

A: BZX84J-C30,115 maintains the 30 V Zener voltage and provides higher power rating (550 mW versus 500 mW). However, it uses SOD-323F packaging instead of SOD-523, requiring PCB layout modification. The lower impedance (40 Ohms versus 80 Ohms) may affect circuit performance in voltage regulation applications. Electrical verification is necessary before implementation.

Q: Are the Comchip CZRU52C30 and CZRUR52C30 parts suitable for high-power applications?

A: No. Both Comchip parts are rated for 150 mW, significantly lower than the original 500 mW specification. These parts are suitable only for low-power signal protection and voltage reference applications. Operating temperature range is also narrower (-55°C to 125°C versus -65°C to 150°C).

Q: What does AEC-Q101 qualification mean?

A: AEC-Q101 is an automotive qualification standard for discrete semiconductors. Parts carrying this qualification have undergone rigorous testing for reliability, temperature cycling, and performance consistency. SZMM5Z30VT1G, BZX84J-B30,115, and BZX84J-C30,115 carry AEC-Q101 qualification, making them suitable for automotive applications.

Q: Can I use a lower-power substitute if my application does not require 500 mW dissipation?

A: Yes, provided the substitute part's power rating exceeds the actual power dissipation in your circuit. BZX585-B30,115 and BZX585-C30,115 (300 mW) and PZU30B,115 (310 mW) are suitable for applications requiring less than their respective power ratings. Verify actual power dissipation through circuit analysis before selection.

Q: What is the significance of impedance (Zzt) in Zener diode selection?

A: Impedance affects voltage regulation quality and transient response. Lower impedance (40 Ohms in BZX84J and PZU30B parts) provides better voltage regulation and faster transient response. Higher impedance (80 Ohms in MM5Z30VT1G and BZX585 parts) is acceptable for applications with less stringent regulation requirements. Selection depends on circuit performance specifications.

Q: Are all substitute parts RoHS3 compliant?

A: SZMM5Z30VT1G, BZX585-B30,115, BZX585-C30,115, BZX84J-B30,115, BZX84J-C30,115, CZRU52C30, CZRUR52C30, and PZU30B,115 are all RoHS3 compliant. The original MM5Z30VT1G does not specify RoHS status. Verify RoHS compliance requirements for your application before final part selection.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message