MM5Z20VT1 Zener Diode 20V 100mW Equivalent & Substitute Parts

Part Overview

The MM5Z20VT1 is a surface mount Zener diode manufactured by onsemi, rated for 20V nominal Zener voltage with 100mW maximum power dissipation in SOD-523 packaging. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The part operates across the industrial temperature range of -65°C to 150°C and is RoHS non-compliant.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	20	V
Tolerance	±6%	-
Power - Max	100	mW
Impedance (Max)	55	Ohms
Current - Reverse Leakage @ Vr	50 nA @ 14V	-
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA	-
Operating Temperature	-65°C to 150°C	-
Mounting Type	Surface Mount	-
Package / Case	SOD-523	-

Substitute Part Grouping Explanation

Substitution of the MM5Z20VT1 is determined by the following critical parameters:

Primary Matching Criteria:

Zener voltage: 20V nominal
Operating temperature range: -65°C to 150°C minimum
Reverse leakage current: 50 nA @ 14V or lower
Forward voltage: 900 mV @ 10 mA or compatible

Secondary Compatibility Factors:

Power rating: 100mW or higher (higher ratings provide design margin)
Impedance: 55 Ohms or lower (lower impedance preferred)
Tolerance: ±6% or tighter (tighter tolerance preferred)
Package: SOD-523 preferred for direct mechanical replacement; SOD-323, SOD-323F acceptable with PCB layout modification

Compliance Considerations:

RoHS3 compliance preferred for new designs
AEC-Q100/Q101 automotive qualification available in substitute options

Substitute parts are grouped by package type and power rating to facilitate selection based on application requirements and thermal constraints.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Package	Status	RoHS
MM5Z20VT1	onsemi	20V	±6%	100mW	55Ω	SOD-523	Obsolete	Non-compliant
BZT52C20T-TP	Micro Commercial Co	20V	±5%	100mW	55Ω	SOD-523	Active	ROHS3
MM3Z20VT1G	onsemi	20V	±6%	300mW	55Ω	SOD-323	Active	ROHS3
BZT52H-C20,115	Nexperia USA Inc.	20V	±5%	375mW	20Ω	SOD-123F	Active	ROHS3
BZT585B20T-7	Diodes Incorporated	20V	±2%	350mW	55Ω	SOD-523	Active	ROHS3
BZX585-B20,115	Nexperia USA Inc.	20V	±2%	300mW	55Ω	SOD-523	Active	ROHS3
BZX585-C20,115	Nexperia USA Inc.	20V	±5%	300mW	55Ω	SOD-523	Active	ROHS3
BZX84J-B20,115	NXP Semiconductors	20V	±2%	550mW	20Ω	SOD-323F	Active	ROHS3
BZX84J-C20,115	Nexperia USA Inc.	20V	±5%	550mW	20Ω	SOD-323F	Active	ROHS3
CZRU52C20	Comchip Technology	20V	±5%	150mW	50Ω	0603/SOD-523F	Active	ROHS3
EDZVFHT2R20B	Rohm Semiconductor	20V	±2.18%	150mW	85Ω	SOD-523	Active	ROHS3

Engineering Selection Recommendations

Direct Replacement (Same Package - SOD-523):

BZT52C20T-TP is the primary parametric equivalent. It matches the MM5Z20VT1 in voltage, power rating, impedance, and package. The part is active, RoHS3 compliant, and available in high volume. Tolerance is ±5%, which is tighter than the original ±6%.

BZT585B20T-7 offers higher power dissipation (350mW) in the same SOD-523 package with improved tolerance (±2%) and active product status. This part is suitable when thermal margin is required.

BZX585-B20,115 and BZX585-C20,115 provide 300mW power rating in SOD-523 packaging with AEC-Q100 automotive qualification. Both are active and RoHS3 compliant. The -B20 variant has ±2% tolerance; the -C20 variant has ±5% tolerance.

EDZVFHT2R20B is an automotive-qualified option (AEC-Q101) in SOD-523 packaging with 150mW power rating and ±2.18% tolerance. Operating temperature maximum is 150°C (junction).

Alternative Packages (Higher Power Density):

MM3Z20VT1G is an onsemi product in SOD-323 packaging with 300mW power rating. This option maintains manufacturer continuity while providing higher power dissipation in a smaller footprint. RoHS3 compliant and active.

BZT52H-C20,115 and BZX84J series (BZX84J-B20,115 and BZX84J-C20,115) offer 375mW to 550mW power ratings in SOD-123F and SOD-323F packages respectively. These parts feature lower impedance (20Ω) and automotive qualification (AEC-Q101). PCB layout modification is required for package change.

Lower Power Option:

CZRU52C20 provides 150mW in 0603/SOD-523F package. This part is suitable for applications with lower power requirements and offers compact form factor.

All recommended substitutes are active products with RoHS3 compliance, ensuring long-term availability and regulatory compliance for new designs.

Frequently Asked Questions (FAQ)

Q: Can BZT52C20T-TP directly replace MM5Z20VT1 without PCB modification?

A: Yes. BZT52C20T-TP is a direct replacement. Both parts use SOD-523 packaging, have identical 20V Zener voltage, 100mW power rating, and 55Ω impedance. The only difference is tolerance (±5% vs ±6%) and product status (active vs obsolete). No PCB layout changes are required.

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

A: Both parts are identical except for tolerance specification. BZX585-B20,115 has ±2% tolerance, while BZX585-C20,115 has ±5% tolerance. Both are in SOD-523 packaging with 300mW power rating and AEC-Q100 automotive qualification. Select based on circuit tolerance requirements.

Q: Why would I choose a higher power-rated substitute like BZT585B20T-7 (350mW) instead of BZT52C20T-TP (100mW)?

A: Higher power rating provides thermal margin in applications with sustained current or elevated ambient temperatures. BZT585B20T-7 also offers tighter tolerance (±2%) and lower impedance characteristics. Use higher power ratings when thermal analysis indicates the 100mW rating is marginal.

Q: Are automotive-qualified parts (AEC-Q100/Q101) necessary for non-automotive applications?

A: No. Automotive qualification is not required for non-automotive circuits. However, AEC-qualified parts undergo additional reliability testing and are suitable for any application. BZX585-B20,115, BZX585-C20,115, BZT52H-C20,115, BZX84J series, and EDZVFHT2R20B all carry automotive qualification.

Q: Can I use MM3Z20VT1G (SOD-323) as a substitute if my PCB has SOD-523 pads?

A: No direct substitution without PCB modification. SOD-323 and SOD-523 have different footprints and pad layouts. However, MM3Z20VT1G is a viable alternative if PCB redesign is acceptable. The part offers higher power dissipation (300mW) and is from the same manufacturer (onsemi).

Q: What is the operating temperature range for all substitute parts?

A: Most substitutes operate from -65°C to 150°C, matching the MM5Z20VT1. Exception: CZRU52C20 operates from -55°C to 125°C, which is narrower. EDZVFHT2R20B specifies 150°C as junction temperature maximum. Verify temperature range for your specific application requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are RoHS3 compliant. The original MM5Z20VT1 is RoHS non-compliant. Substitution with any listed part improves regulatory compliance for new designs.

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

A: Impedance (Zzt) is the dynamic impedance of the Zener diode at the test current. Lower impedance indicates better voltage regulation and lower output impedance. The MM5Z20VT1 has 55Ω impedance. Substitutes with 20Ω impedance (BZT52H-C20,115, BZX84J series) provide superior regulation but require package change.

Q: Can I use CZRU52C20 (150mW) in place of MM5Z20VT1 (100mW)?

A: CZRU52C20 has higher power rating (150mW), so it can handle the same current. However, it uses 0603/SOD-523F packaging instead of SOD-523, requiring PCB modification. Operating temperature range is also narrower (-55°C to 125°C). Use only if PCB redesign is acceptable and temperature range is sufficient.

Q: What is the difference between SOD-523, SOD-323, SOD-123F, and SOD-323F packages?

A: These are different surface mount package sizes. SOD-523 and SOD-323 are the smallest; SOD-123F and SOD-323F are larger. Larger packages generally allow higher power dissipation. Package selection depends on PCB space constraints and thermal requirements. Direct replacement requires matching package type.

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