MM5Z39VT1 Equivalent & Substitute Parts

Part Overview

The MM5Z39VT1 is a Zener diode rated at 39 V nominal voltage with 100 mW maximum power dissipation in a surface mount SOD-523 package. Manufactured by onsemi, this component is classified as obsolete. Due to its obsolete status, equivalent and substitute parts from active manufacturers are necessary for new designs and ongoing production requirements. Substitute parts maintain the core electrical specifications while offering improved availability, compliance certifications, and in some cases enhanced performance characteristics.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	39	V
Tolerance	±5%	—
Power - Max	100	mW
Impedance (Max)	130	Ohms
Current - Reverse Leakage @ Vr	50	nA @ 27.3 V
Voltage - Forward (Vf) (Max) @ If	900	mV @ 10 mA
Operating Temperature Range	-65 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	SOD-523	—
RoHS Status	RoHS non-compliant	—

Substitute Part Grouping Explanation

Substitution of the MM5Z39VT1 is determined by the following critical parameters:

Electrical Equivalence Criteria:

Zener voltage: 39 V nominal
Tolerance: ±5% (allows ±2% tolerance as superior alternative)
Reverse leakage current: 50 nA @ 27.3 V (allows higher values as acceptable)
Forward voltage: 900 mV @ 10 mA (allows up to 1.1 V @ 100 mA as acceptable)
Operating temperature range: -65°C to 150°C (allows identical or extended ranges)

Mechanical Compatibility Criteria:

Mounting type: Surface Mount (required)
Package options: SOD-523 (direct equivalent), SOD-323, SOD-323F, SOD-123F (pin-compatible alternatives with different footprints)

Compliance & Availability Criteria:

Product status: Active (preferred over obsolete)
RoHS compliance: ROHS3 Compliant (preferred)
Automotive qualification: AEC-Q100 or AEC-Q101 (optional enhancement)

Substitute parts are grouped into two categories: Direct Equivalents (same package, same power rating) and Similar Equivalents (same electrical specifications, alternative packages with higher power ratings or improved compliance).

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Package	Status	RoHS	Automotive
MM5Z39VT1	onsemi	39	±5%	100	130	SOD-523	Obsolete	Non-compliant	—
MM3Z39VT1G	onsemi	39	±5%	300	130	SOD-323	Active	ROHS3	—
BZT52H-C39,115	Nexperia USA Inc.	39	±5%	375	75	SOD-123F	Active	ROHS3	AEC-Q101
BZX585-B39,115	Nexperia USA Inc.	39	±2%	300	130	SOD-523	Active	ROHS3	AEC-Q100
BZX585-C39,115	Nexperia USA Inc.	39	±5%	300	130	SOD-523	Active	ROHS3	AEC-Q100
BZX84J-B39,115	Nexperia USA Inc.	39	±2%	550	75	SOD-323F	Active	ROHS3	AEC-Q101
BZX84J-C39,115	Nexperia USA Inc.	39	±5%	550	75	SOD-323F	Active	ROHS3	AEC-Q101
CZRU52C39	Comchip Technology	39	±5%	150	90	0603/SOD-523F	Active	ROHS3	—
BZT52C39T-TP	Micro Commercial Co	39	±5%	100	130	SOD-523	Active	ROHS3	—

Engineering Selection Recommendations

Primary Recommendation: BZT52C39T-TP

The BZT52C39T-TP from Micro Commercial Co is the closest parametric equivalent to the MM5Z39VT1. It maintains identical electrical specifications (39 V, ±5% tolerance, 100 mW power rating, 130 Ohms impedance) and uses the same SOD-523 package. The part is active in production, RoHS3 compliant, and offers superior availability compared to the obsolete MM5Z39VT1.

Secondary Recommendation: BZX585-C39,115

The BZX585-C39,115 from Nexperia USA Inc. provides equivalent electrical performance in the same SOD-523 package with increased power dissipation (300 mW). This part carries AEC-Q100 automotive qualification and RoHS3 compliance, making it suitable for applications requiring automotive-grade reliability. The ±5% tolerance matches the original specification.

Alternative for Higher Power Applications: BZX84J-C39,115

For designs requiring higher power dissipation, the BZX84J-C39,115 offers 550 mW in a SOD-323F package with AEC-Q101 automotive qualification. This part maintains the 39 V nominal voltage and ±5% tolerance while providing enhanced thermal performance through a larger package footprint.

Alternative for Compact Designs: MM3Z39VT1G

The MM3Z39VT1G from onsemi provides an active-status alternative with 300 mW power rating in a SOD-323 package. As an onsemi product, it maintains design continuity while offering improved compliance and availability.

All recommended substitutes maintain the -65°C to 150°C operating temperature range and are RoHS3 compliant, addressing the non-compliance status of the original MM5Z39VT1.

Frequently Asked Questions (FAQ)

Q: Can BZT52C39T-TP be used as a direct replacement for MM5Z39VT1?

A: Yes. The BZT52C39T-TP maintains identical electrical specifications (39 V, ±5%, 100 mW, 130 Ohms impedance) and uses the same SOD-523 package. No circuit modifications are required.

Q: What is the difference between BZX585-C39,115 and BZT52C39T-TP?

A: Both parts share the same SOD-523 package and 39 V nominal voltage. The BZX585-C39,115 provides 300 mW power dissipation versus 100 mW for the BZT52C39T-TP, and includes AEC-Q100 automotive qualification. The BZX585-C39,115 is suitable for applications requiring higher thermal margin or automotive compliance.

Q: Why do some substitutes have different packages (SOD-323, SOD-323F)?

A: Alternative packages provide different physical footprints and thermal characteristics. SOD-323 and SOD-323F packages are larger than SOD-523, allowing higher power dissipation. Package selection depends on available PCB space and thermal requirements. Pin configurations remain compatible for zener diode applications.

Q: Is the ±2% tolerance of BZX585-B39,115 better than the ±5% of MM5Z39VT1?

A: The ±2% tolerance of BZX585-B39,115 provides tighter voltage regulation compared to the ±5% specification of MM5Z39VT1. This is an improvement for applications requiring precise voltage reference, though both parts meet the original specification.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All active substitute parts listed are RoHS3 compliant, addressing the non-compliance status of the obsolete MM5Z39VT1. This compliance is mandatory for new designs in most markets.

Q: Which substitute is recommended for automotive applications?

A: BZX585-C39,115 (AEC-Q100) and BZX84J-C39,115 (AEC-Q101) are qualified for automotive use. Both maintain 39 V nominal voltage and ±5% tolerance. Selection between these depends on power dissipation requirements: 300 mW for BZX585-C39,115 or 550 mW for BZX84J-C39,115.

Q: Can CZRU52C39 be used as a substitute?

A: CZRU52C39 maintains the 39 V nominal voltage and ±5% tolerance but has a lower operating temperature range (-55°C to 125°C versus -65°C to 150°C) and lower power rating (150 mW). It is suitable only for applications within its specified temperature range and power requirements.

Q: What is the inventory status of substitute parts?

A: BZT52C39T-TP has 4,896 pieces in stock. BZX585-C39,115 has 6,980 pieces. BZX84J-C39,115 has 2,900 pieces. BZX585-B39,115 has 3,269 pieces. All substitutes offer significantly higher availability than the obsolete MM5Z39VT1.

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