MM5Z20V Zener Diode Equivalent & Substitute Parts

Part Overview

The MM5Z20V is a 20 V, 200 mW surface mount zener diode manufactured by onsemi in SOD-523F packaging. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The MM5Z20V serves voltage regulation and protection applications requiring a 20 V nominal zener voltage with ±6% tolerance and 200 mW maximum power dissipation in a compact surface mount form factor.

Key Parameters

Parameter	Value
Voltage - Zener (Nom)	20 V
Tolerance	±6%
Power - Max	200 mW
Impedance (Max)	55 Ohms
Current - Reverse Leakage @ Vr	50 nA @ 14 V
Operating Temperature	-55°C ~ 150°C
Mounting Type	Surface Mount
Package / Case	SOD-523F
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the MM5Z20V is determined by the following critical parameters:

Primary Matching Criteria:

Voltage - Zener (Nom): 20 V (exact match required)
Mounting Type: Surface Mount (required for PCB compatibility)
Tolerance: ±6% or tighter (acceptable for voltage regulation applications)
Power - Max: 200 mW or greater (equal or higher power rating acceptable)
Impedance (Max): 55 Ohms or lower (lower impedance acceptable)
Current - Reverse Leakage @ Vr: 50 nA @ 14 V or lower (lower leakage acceptable)
Operating Temperature: -55°C ~ 150°C minimum range (equal or wider range acceptable)

Package Considerations: Substitutes are grouped by package type. SOD-523F (SC-79) is the original package. Substitutes in SOD-323 (SC-76) and SOD-123F packages represent different form factors with different power ratings and impedance characteristics. SOD-523 variants maintain the same footprint as the original SOD-523F.

All substitute parts meet or exceed the electrical specifications of the MM5Z20V while offering improved product status (active vs. obsolete) and compliance certifications.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Impedance (Max)	Leakage @ Vr	Temp Range	Package	Status
MM5Z20V	onsemi	20 V	±6%	200 mW	55 Ω	50 nA @ 14 V	-55°C ~ 150°C	SOD-523F	Obsolete
MM3Z20VT1G	onsemi	20 V	±6%	300 mW	55 Ω	50 nA @ 14 V	-65°C ~ 150°C	SOD-323	Active
BZT52H-C20,115	Nexperia USA Inc.	20 V	±5%	375 mW	20 Ω	50 nA @ 14 V	-65°C ~ 150°C	SOD-123F	Active
BZX584C20_R1_00001	Panjit International Inc.	20 V	±5%	200 mW	55 Ω	100 nA @ 14 V	-55°C ~ 150°C	SOD-523	Active
BZX585-B20,115	Nexperia USA Inc.	20 V	±2%	300 mW	55 Ω	50 nA @ 700 mV	-65°C ~ 150°C	SOD-523	Active
BZX585-C20,115	Nexperia USA Inc.	20 V	±5%	300 mW	55 Ω	50 nA @ 14 V	-65°C ~ 150°C	SOD-523	Active
BZX84J-B20,115	NXP Semiconductors	20 V	±2%	550 mW	20 Ω	50 nA @ 14 V	-65°C ~ 150°C	SOD-323F	Active
BZX84J-C20,115	Nexperia USA Inc.	20 V	±5%	550 mW	20 Ω	50 nA @ 14 V	-65°C ~ 150°C	SOD-323F	Active

Engineering Selection Recommendations

Direct Footprint Replacement (SOD-523F/SOD-523):

For applications requiring identical or near-identical PCB footprint compatibility, BZX584C20_R1_00001 (Panjit) and BZX585-B20,115 or BZX585-C20,115 (Nexperia) are suitable. BZX584C20_R1_00001 maintains the exact 200 mW power rating and SOD-523 package. BZX585-B20,115 and BZX585-C20,115 offer improved specifications with 300 mW power rating, tighter tolerance (±2% for B20 variant), and active product status with AEC-Q100 automotive qualification.

Higher Power Density Alternatives (SOD-323):

MM3Z20VT1G (onsemi) provides 300 mW in SOD-323 packaging with active product status and RoHS3 compliance. This option is suitable when PCB space permits a slightly larger package and higher power dissipation is beneficial.

Maximum Performance Option (SOD-323F):

BZX84J-B20,115 and BZX84J-C20,115 (Nexperia/NXP) deliver 550 mW power rating with lower impedance (20 Ω vs. 55 Ω), AEC-Q101 automotive qualification, and active product status. These parts are appropriate for applications requiring superior thermal performance and tighter impedance control.

Compliance and Certification:

All substitute parts carry RoHS3 compliance and REACH Unaffected status. BZX585 series parts include AEC-Q100 automotive qualification. BZT52H-C20,115 and BZX84J series include AEC-Q101 automotive qualification, suitable for automotive and high-reliability applications.

Frequently Asked Questions (FAQ)

Q: Can MM3Z20VT1G replace MM5Z20V directly on the PCB?

A: MM3Z20VT1G uses SOD-323 packaging while MM5Z20V uses SOD-523F. These packages have different footprints and pin spacing. PCB layout modification is required. However, electrical specifications are compatible: both have 20 V nominal voltage, ±6% tolerance, and identical reverse leakage characteristics.

Q: What is the difference between BZX585-B20,115 and BZX585-C20,115?

A: Both parts use SOD-523 packaging and have 300 mW power rating. BZX585-B20,115 has ±2% tolerance and is specified at 700 mV reverse voltage. BZX585-C20,115 has ±5% tolerance and is specified at 14 V reverse voltage. Both are AEC-Q100 qualified and active products.

Q: Is BZX584C20_R1_00001 a true equivalent to MM5Z20V?

A: BZX584C20_R1_00001 matches the MM5Z20V in power rating (200 mW), impedance (55 Ω), and operating temperature range (-55°C ~ 150°C). It uses SOD-523 packaging, compatible with SOD-523F footprints. The tolerance is ±5% versus ±6%, and reverse leakage is 100 nA versus 50 nA. This part is active and RoHS3 compliant.

Q: Why do some substitutes have lower impedance values?

A: Lower impedance (20 Ω vs. 55 Ω) indicates better voltage regulation characteristics and lower dynamic resistance. Parts like BZT52H-C20,115 and BZX84J series offer superior performance in voltage regulation applications. Lower impedance is a beneficial characteristic and does not prevent substitution.

Q: Are all substitute parts suitable for automotive applications?

A: BZT52H-C20,115, BZX585-B20,115, BZX585-C20,115, BZX84J-B20,115, and BZX84J-C20,115 carry automotive grade designation and AEC-Q100 or AEC-Q101 qualification. MM3Z20VT1G and BZX584C20_R1_00001 do not specify automotive qualification. Verify application requirements before selection.

Q: What is the impact of tolerance differences (±6% vs. ±5% vs. ±2%)?

A: Tighter tolerance (lower percentage) provides more precise voltage regulation. ±2% tolerance parts (BZX585-B20,115, BZX84J-B20,115) offer superior voltage accuracy compared to the original ±6% specification. This is beneficial for precision voltage reference applications. Wider tolerance is not acceptable; only equal or tighter tolerance substitutes are valid.

Q: Can I use a higher power-rated part in place of MM5Z20V?

A: Yes. Higher power ratings (300 mW, 375 mW, 550 mW) are acceptable substitutes. The higher power rating provides additional thermal margin and does not affect circuit operation. The part will simply dissipate less heat in typical applications. Package size may change, requiring PCB layout verification.

Q: What packaging considerations apply when selecting a substitute?

A: SOD-523F and SOD-523 packages are mechanically compatible and share the same footprint. SOD-323 and SOD-123F packages require different PCB footprints and cannot be used as direct drop-in replacements without layout modification. Verify package compatibility with your PCB design before part selection.

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