MM5Z30VT1 Equivalent & Substitute Parts

Part Overview

The MM5Z30VT1 is a Zener diode manufactured by onsemi, rated at 30 V nominal with 100 mW maximum power dissipation in a surface mount SOD-523 package. This component is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design requirements and production continuity. The part operates across a temperature range of -65°C to 150°C with ±7% voltage tolerance and is RoHS non-compliant.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	30	V
Tolerance	±7%	—
Power - Max	100	mW
Impedance (Max)	80	Ohms
Current - Reverse Leakage @ Vr	50	nA @ 21 V
Voltage - Forward (Vf) (Max) @ If	900	mV @ 10 mA
Operating Temperature	-65 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	SOD-523	—

Substitute Part Grouping Explanation

Substitution of the MM5Z30VT1 is determined by the following critical parameters:

Primary Matching Criteria:

Voltage - Zener (Nom): 30 V (exact match required)
Operating Temperature Range: -65°C to 150°C (minimum requirement)
Mounting Type: Surface Mount (required for PCB compatibility)
Current - Reverse Leakage @ Vr: 50 nA @ 21 V (functional equivalence)

Secondary Compatibility Factors:

Power - Max: 100 mW or greater (higher power ratings are acceptable for drop-in replacement)
Impedance (Max): 80 Ohms or lower (lower impedance is acceptable)
Voltage - Forward (Vf) (Max) @ If: 900 mV @ 10 mA (functional equivalence)
Package / Case: SOD-523 or compatible surface mount packages (SOD-323F, SOD-123F acceptable with layout verification)

Substitute parts are grouped into two categories:

Parametric Equivalents: Parts matching all electrical specifications and the SOD-523 package footprint. These provide direct replacement capability.

Functional Substitutes: Parts with identical zener voltage and operating temperature range but different power ratings or package formats. These require circuit validation for thermal and mechanical compatibility.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (V)	Tolerance	Power Max (mW)	Zzt Max (Ohms)	Vf Max @ If (mV @ mA)	Temp Range (°C)	Package	Product Status
MM5Z30VT1	onsemi	30	±7%	100	80	900 @ 10	-65 to 150	SOD-523	Obsolete
BZT52C30T-TP	Micro Commercial Co	30	±7%	100	80	900 @ 10	-65 to 150	SOD-523	Active
CZRU52C30	Comchip Technology	30	±5%	150	80	900 @ 10	-55 to 125	0603/SOD-523F	Active
BZT52H-C30,115	NXP Semiconductors	30	±5%	375	40	900 @ 10	-65 to 150	SOD-123F	Active
PZU30B,115	Nexperia USA Inc.	30	±5%	310	40	1100 @ 100	-65 to 150	SOD-323F	Active
BZX84J-C30,115	Nexperia USA Inc.	30	±5%	550	40	1100 @ 100	-65 to 150	SOD-323F	Active
BZX84J-B30,115	Nexperia USA Inc.	30	±2%	550	40	1100 @ 100	-65 to 150	SOD-323F	Active
BZX585-C30,115	Nexperia USA Inc.	30	±5%	300	80	1100 @ 100	-65 to 150	SOD-523	Active
BZX585-B30,115	Nexperia USA Inc.	30	±2%	300	80	1100 @ 100	-65 to 150	SOD-523	Active

Engineering Selection Recommendations

Direct Parametric Equivalent:

BZT52C30T-TP (Micro Commercial Co) is the primary substitute for MM5Z30VT1. This part matches all electrical specifications (30 V, ±7% tolerance, 100 mW, 80 Ohms impedance) and maintains the SOD-523 package footprint. The part is currently in active production status with RoHS3 compliance and AEC-Q100 qualification, providing improved supply chain availability compared to the obsolete MM5Z30VT1.

Higher Power Alternatives with Same Package:

BZX585-B30,115 and BZX585-C30,115 (Nexperia USA Inc.) provide 300 mW power ratings in the SOD-523 package with identical operating temperature range (-65°C to 150°C). These parts are suitable for applications requiring increased thermal margin. BZX585-B30,115 offers ±2% tolerance, while BZX585-C30,115 provides ±5% tolerance. Both are AEC-Q100 qualified and RoHS3 compliant.

Alternative Package Options:

For applications where package footprint flexibility exists, the following active parts provide equivalent electrical performance:

BZT52H-C30,115 (NXP Semiconductors): 375 mW in SOD-123F package, AEC-Q101 qualified
PZU30B,115 (Nexperia USA Inc.): 310 mW in SOD-323F package, AEC-Q100 qualified
BZX84J-C30,115 (Nexperia USA Inc.): 550 mW in SOD-323F package, AEC-Q101 qualified
BZX84J-B30,115 (Nexperia USA Inc.): 550 mW in SOD-323F package with ±2% tolerance, AEC-Q101 qualified

Temperature Range Consideration:

CZRU52C30 (Comchip Technology) operates at -55°C to 125°C, which is narrower than the MM5Z30VT1 specification of -65°C to 150°C. This part is suitable only for applications within the reduced temperature range.

Compliance Status:

All recommended substitutes are RoHS3 compliant and REACH unaffected, providing regulatory advantage over the RoHS non-compliant MM5Z30VT1. Automotive-grade options (AEC-Q100 or AEC-Q101 qualified) are available from Nexperia and NXP for applications requiring automotive qualification.

Frequently Asked Questions (FAQ)

Q: Can BZT52C30T-TP directly replace MM5Z30VT1 without circuit modification?

A: Yes. BZT52C30T-TP is a parametric equivalent with identical electrical specifications (30 V, ±7%, 100 mW, 80 Ohms) and the same SOD-523 package. No circuit modification is required for direct substitution.

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

A: Both parts are identical except for voltage tolerance. BZX585-B30,115 provides ±2% tolerance, while BZX585-C30,115 provides ±5% tolerance. Both offer 300 mW power in SOD-523 package. Selection depends on circuit tolerance requirements.

Q: Can I use BZX84J-C30,115 (550 mW) instead of MM5Z30VT1 (100 mW)?

A: Yes, from an electrical standpoint. The higher power rating (550 mW vs. 100 mW) provides thermal margin. However, the package changes from SOD-523 to SOD-323F, requiring PCB layout modification. The lower impedance (40 Ohms vs. 80 Ohms) may affect circuit response characteristics and should be evaluated in the specific application.

Q: Why is CZRU52C30 not recommended as a primary substitute?

A: CZRU52C30 operates at -55°C to 125°C, which does not meet the MM5Z30VT1 specification of -65°C to 150°C. This part is suitable only for applications with reduced temperature requirements.

Q: What is the advantage of AEC-Q100 or AEC-Q101 qualified parts?

A: AEC-Q100 and AEC-Q101 qualifications indicate automotive-grade reliability testing and are required for automotive applications. All recommended substitutes except CZRU52C30 carry one of these qualifications, providing enhanced reliability documentation compared to the obsolete MM5Z30VT1.

Q: Does the ±7% tolerance of BZT52C30T-TP match the MM5Z30VT1 requirement?

A: Yes. Both parts specify ±7% voltage tolerance, ensuring equivalent circuit performance in applications designed for this tolerance band.

Q: Can I substitute MM5Z30VT1 with a part having ±2% tolerance?

A: Yes. Parts with tighter tolerance (±2%) such as BZX585-B30,115 or BZX84J-B30,115 are backward compatible with designs specified for ±7% tolerance. The tighter tolerance provides improved performance margin.

Q: What is the difference between SOD-523 and SOD-323F packages?

A: SOD-523 and SOD-323F are different surface mount package formats with different footprints and land patterns. Direct substitution between these packages requires PCB layout modification. SOD-523 is smaller and more compact, while SOD-323F is larger. Verify PCB design constraints before selecting parts with different packages.

Q: Are all substitute parts RoHS compliant?

A: Yes. All recommended substitute parts are RoHS3 compliant, providing regulatory advantage over the RoHS non-compliant MM5Z30VT1. This compliance status is maintained across all active production alternatives.

Q: What does impedance (Zzt) represent, and why does it matter?

A: Impedance (Zzt) is the dynamic impedance of the zener diode at the specified test current. Lower impedance indicates better voltage regulation characteristics. The MM5Z30VT1 specifies 80 Ohms maximum. Substitutes with lower impedance (40 Ohms) provide improved regulation but may require circuit evaluation for transient response effects.

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