MM5Z39V Zener Diode 39V 200mW Equivalent & Substitute Parts

Part Overview

The MM5Z39V is a surface mount Zener diode manufactured by onsemi, rated for 39 V nominal Zener voltage with 200 mW maximum power dissipation in SOD-523F packaging. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The part operates across a temperature range of -55°C to 150°C with ±5% voltage tolerance and is suitable for voltage regulation and protection applications in surface mount designs.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	39	V
Tolerance	±5%	-
Power - Max	200	mW
Impedance (Max)	130	Ohms
Current - Reverse Leakage @ Vr	50	nA @ 27.3 V
Operating Temperature	-55 to 150	°C
Mounting Type	Surface Mount	-
Package / Case	SOD-523F	-
Moisture Sensitivity Level	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitution of the MM5Z39V is determined by strict alignment of electrical and mechanical parameters. The primary substitution criteria are:

Electrical Compatibility Requirements:

Zener voltage: 39 V nominal (matching voltage regulation function)
Tolerance: ±5% or tighter (±2% acceptable for improved precision)
Power rating: 200 mW minimum (higher ratings acceptable for thermal margin)
Impedance: 130 Ohms maximum (lower impedance acceptable)
Reverse leakage: 50 nA or lower @ 27.3 V (lower leakage acceptable)
Operating temperature: -55°C to 150°C minimum range (extended ranges acceptable)

Mechanical Compatibility Requirements:

Mounting type: Surface Mount (mandatory)
Package options: SOD-523F (primary), SOD-523 (compatible footprint), SOD-323 (smaller footprint, requires PCB redesign), SOD-323F (smaller footprint, requires PCB redesign)

Substitute parts are grouped by package family. Parts within the same package family (SOD-523 variants) are direct mechanical substitutes. Parts in different package families (SOD-323 variants) require PCB layout modification but maintain electrical compatibility.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Leakage @ 27.3V (nA)	Temp Range (°C)	Package	Status
MM5Z39V	onsemi	39	±5%	200	130	50	-55 to 150	SOD-523F	Obsolete
BZT52C39S-7-F	Diodes Incorporated	39	±5%	200	130	100	-65 to 150	SOD-323	Active
BZT52H-C39,115	Nexperia USA Inc.	39	±5%	375	75	50	-65 to 150	SOD-123F	Active
BZX584B39-TP	Micro Commercial Co	39	±2%	150	130	100	-55 to 150	SOD-523	Active
BZX584C39_R1_00001	Panjit International Inc.	39	±5%	200	130	100	-55 to 150	SOD-523	Active
BZX585-B39,115	Nexperia USA Inc.	39	±2%	300	130	50	-65 to 150	SOD-523	Active
BZX585-C39,115	Nexperia USA Inc.	39	±5%	300	130	50	-65 to 150	SOD-523	Active
BZX84J-B39,115	Nexperia USA Inc.	39	±2%	550	75	50	-65 to 150	SOD-323F	Active
BZX84J-C39,115	Nexperia USA Inc.	39	±5%	550	75	50	-65 to 150	SOD-323F	Active

Engineering Selection Recommendations

Direct Mechanical Substitutes (SOD-523 Package Family):

BZX584C39_R1_00001 (Panjit International Inc.) and BZX585-C39,115 (Nexperia USA Inc.) are the primary substitutes for MM5Z39V. Both maintain identical electrical specifications (39 V, ±5% tolerance, 130 Ohms impedance) and operate within the required temperature range. BZX584C39_R1_00001 matches the 200 mW power rating exactly, while BZX585-C39,115 provides 300 mW for enhanced thermal margin. Both are RoHS3 compliant and carry active product status.

BZX585-B39,115 (Nexperia USA Inc.) offers improved voltage tolerance (±2%) with 300 mW power rating in the same SOD-523 package. This part includes AEC-Q100 automotive qualification, suitable for applications requiring enhanced reliability documentation.

BZX584B39-TP (Micro Commercial Co) provides an alternative with ±2% tolerance and 150 mW power rating. This part operates within the original temperature range (-55°C to 150°C) and maintains SOD-523 package compatibility.

Alternative Package Options (SOD-323 and SOD-323F):

BZT52C39S-7-F (Diodes Incorporated) substitutes in SOD-323 package with matching 200 mW power and ±5% tolerance. This smaller package requires PCB layout modification but maintains electrical equivalence.

BZX84J-C39,115 (Nexperia USA Inc.) provides 550 mW power dissipation in SOD-323F package with ±5% tolerance and AEC-Q101 automotive qualification. The reduced impedance (75 Ohms) improves voltage regulation characteristics.

BZT52H-C39,115 (Nexperia USA Inc.) offers 375 mW in SOD-123F package with AEC-Q101 qualification and reduced impedance (75 Ohms), suitable for applications requiring improved regulation performance.

Compliance and Certification:

All recommended substitutes are RoHS3 compliant and REACH unaffected. Parts carrying AEC-Q100 or AEC-Q101 qualification (BZX585-B39,115, BZX84J-B39,115, BZX84J-C39,115, BZT52H-C39,115) are suitable for automotive and high-reliability applications.

Frequently Asked Questions (FAQ)

Q: Can BZX584C39_R1_00001 directly replace MM5Z39V without PCB modification?

A: Yes. BZX584C39_R1_00001 maintains identical electrical specifications (39 V, ±5%, 200 mW, 130 Ohms) and operates within the same temperature range (-55°C to 150°C). Both use SOD-523 package with compatible footprints. No PCB layout changes are required.

Q: What is the difference between BZX585-C39,115 and BZX585-B39,115?

A: Both parts are identical except for voltage tolerance. BZX585-C39,115 has ±5% tolerance matching the original MM5Z39V specification, while BZX585-B39,115 has ±2% tolerance for improved precision. Both provide 300 mW power in SOD-523 package and carry AEC-Q100 automotive qualification.

Q: Can I use BZT52C39S-7-F as a substitute if my PCB supports SOD-323 package?

A: Yes. BZT52C39S-7-F matches the electrical specifications (39 V, ±5%, 200 mW, 130 Ohms) and operates across -65°C to 150°C, exceeding the original temperature range. The SOD-323 package is mechanically different from SOD-523F, requiring PCB footprint modification. Electrical performance remains equivalent.

Q: Why do some substitutes have higher power ratings (300 mW, 375 mW, 550 mW)?

A: Higher power ratings provide thermal margin in applications with elevated ambient temperatures or higher current stress. Electrical characteristics (Zener voltage, tolerance, impedance) remain compatible. The component will operate safely at lower power levels than its maximum rating.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry RoHS3 compliance status. The original MM5Z39V does not specify RoHS status due to its obsolete classification.

Q: Which substitute offers the best voltage regulation performance?

A: BZX84J-C39,115 and BZT52H-C39,115 both feature reduced impedance (75 Ohms versus 130 Ohms), improving voltage regulation characteristics. BZX84J-C39,115 provides 550 mW in SOD-323F package, while BZT52H-C39,115 provides 375 mW in SOD-123F package. Both carry AEC-Q101 automotive qualification.

Q: Can I substitute MM5Z39V with a part having ±2% tolerance instead of ±5%?

A: Yes. ±2% tolerance is tighter than ±5%, providing improved voltage accuracy. Parts such as BZX584B39-TP, BZX585-B39,115, and BZX84J-B39,115 offer ±2% tolerance and are electrically compatible. This substitution improves circuit performance without introducing incompatibility.

Q: What is the minimum power rating acceptable for substitution?

A: The minimum acceptable power rating is 200 mW, matching the original MM5Z39V specification. BZX584B39-TP at 150 mW falls below this threshold and should only be used if circuit analysis confirms reduced power dissipation requirements.

Q: Do I need to verify compatibility before using a substitute part?

A: Substitution is based on strict alignment of provided electrical and mechanical parameters. Parts listed in this reference meet all compatibility criteria. Circuit-level validation is a standard engineering practice independent of component substitution.

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