MM5Z15VT5G Equivalent & Substitute Parts

Part Overview

The MM5Z15VT5G is a Zener diode manufactured by onsemi, rated at 15 V nominal voltage with 500 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 support and procurement. The part operates across a temperature range of -65°C to 150°C with ±5% voltage tolerance and is suitable for voltage regulation and protection applications in electronic circuits.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	15	V
Tolerance	±5%	%
Power - Max	500	mW
Impedance (Max)	30	Ohms
Current - Reverse Leakage @ Vr	50	nA @ 10.5 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 MM5Z15VT5G is determined by the following critical parameters: nominal Zener voltage (15 V), maximum power rating, voltage tolerance, package type (SOD-523), and operating temperature range (-65°C to 150°C). All substitute parts must maintain the same nominal voltage and package configuration to ensure mechanical and electrical compatibility.

Substitute parts are grouped into two categories:

Direct Equivalents (Parametric Match): Parts with identical electrical specifications including 15 V nominal voltage, 500 mW power rating, ±5% tolerance, and SOD-523 packaging. These parts are fully interchangeable with the main part.

Similar Alternatives (Reduced Power Rating): Parts with matching 15 V nominal voltage and SOD-523 packaging but reduced maximum power dissipation (300 mW instead of 500 mW). These parts are suitable for applications where the full 500 mW power capability is not required. Tolerance variations (±2% vs. ±5%) and impedance differences are noted but do not prevent substitution in voltage regulation circuits where the tighter tolerance may be beneficial.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power - Max	Zzt (Max)	Package	Product Status	Compliance
MM5Z15VT5G	onsemi	15 V	±5%	500 mW	30 Ω	SOD-523	Obsolete	REACH Unaffected
MM5Z15VT1G	onsemi	15 V	±5%	500 mW	30 Ω	SOD-523	Active	ROHS3 Compliant
SZMM5Z15VT1G	onsemi	15 V	±5%	500 mW	30 Ω	SOD-523	Active	ROHS3 Compliant, AEC-Q101
BZX585-B15,115	Nexperia USA Inc.	15 V	±2%	300 mW	15 Ω	SOD-523	Active	ROHS3 Compliant, AEC-Q100
BZX585-B15,135	Nexperia USA Inc.	15 V	±2%	300 mW	15 Ω	SOD-523	Active	ROHS3 Compliant, AEC-Q100
BZX585-C15,115	Nexperia USA Inc.	15 V	±5%	300 mW	15 Ω	SOD-523	Active	ROHS3 Compliant, AEC-Q100
BZX585-C15,135	Nexperia USA Inc.	15 V	±5%	300 mW	15 Ω	SOD-523	Active	ROHS3 Compliant, AEC-Q100
BZX84J-B15,115	Nexperia USA Inc.	15 V	±2%	550 mW	15 Ω	SOD-323F	Active	ROHS3 Compliant, AEC-Q101

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications):

MM5Z15VT1G is the primary direct equivalent to MM5Z15VT5G. Both parts share identical electrical parameters (15 V, ±5%, 500 mW, SOD-523) and operating temperature range. MM5Z15VT1G is active in production with ROHS3 compliance, making it the preferred choice for new designs and obsolescence mitigation. Packaging differs (Cut Tape & Digi-Reel® vs. original packaging), but electrical performance is identical.

SZMM5Z15VT1G provides an alternative direct equivalent with automotive-grade qualification (AEC-Q101) and Tape & Reel packaging. This part is suitable for applications requiring automotive-level reliability and traceability.

For Reduced Power Applications:

BZX585-C15,115 and BZX585-C15,135 are suitable substitutes where maximum power dissipation does not exceed 300 mW. Both maintain the 15 V nominal voltage, ±5% tolerance, and SOD-523 package. These Nexperia parts carry AEC-Q100 automotive qualification and ROHS3 compliance. The lower impedance (15 Ω vs. 30 Ω) provides improved voltage regulation characteristics in some circuit topologies.

BZX585-B15,115 and BZX585-B15,135 offer tighter voltage tolerance (±2%) at the cost of reduced power rating (300 mW). These parts are appropriate for precision voltage reference applications where the enhanced tolerance specification is beneficial.

For Higher Power Capability:

BZX84J-B15,115 provides 550 mW power dissipation, exceeding the original 500 mW specification. However, this part uses SOD-323F packaging instead of SOD-523, requiring PCB layout modification and is not a direct mechanical substitute.

Frequently Asked Questions (FAQ)

Q: Can MM5Z15VT1G directly replace MM5Z15VT5G without circuit modification?

A: Yes. MM5Z15VT1G is electrically and mechanically identical to MM5Z15VT5G. Both parts have 15 V nominal voltage, ±5% tolerance, 500 mW power rating, and SOD-523 packaging. The only difference is product status (active vs. obsolete) and packaging format (Cut Tape & Digi-Reel® vs. original). No circuit changes are required.

Q: What is the difference between MM5Z15VT1G and SZMM5Z15VT1G?

A: Both parts are electrically identical with matching 15 V, ±5%, 500 mW specifications and SOD-523 packaging. SZMM5Z15VT1G includes automotive-grade qualification (AEC-Q101) and is supplied in Tape & Reel format, while MM5Z15VT1G is supplied in Cut Tape & Digi-Reel® format. Selection depends on packaging requirements and whether automotive qualification is necessary for the application.

Q: Can I use BZX585-C15,115 as a substitute if my circuit only requires 300 mW?

A: Yes. BZX585-C15,115 is suitable for applications where power dissipation does not exceed 300 mW. It maintains the 15 V nominal voltage, ±5% tolerance, and SOD-523 package. The reduced impedance (15 Ω vs. 30 Ω) may improve voltage regulation performance in some circuits. Verify that your circuit design does not require the full 500 mW capability before substitution.

Q: What is the difference between BZX585-B15 and BZX585-C15 series?

A: The primary difference is voltage tolerance. BZX585-B15 series specifies ±2% tolerance, while BZX585-C15 series specifies ±5% tolerance. Both series have identical 15 V nominal voltage, 300 mW power rating, and SOD-523 packaging. BZX585-B15 is appropriate for precision voltage reference applications; BZX585-C15 is suitable for general voltage regulation.

Q: Why does BZX84J-B15,115 have higher power rating but different packaging?

A: BZX84J-B15,115 uses SOD-323F packaging, which provides improved thermal characteristics and supports 550 mW power dissipation compared to the 500 mW capability of SOD-523. The different package size requires PCB layout modification and is not a direct mechanical substitute. Use this part only if higher power capability is required and PCB redesign is acceptable.

Q: Are all substitute parts ROHS3 compliant?

A: All active substitute parts listed (MM5Z15VT1G, SZMM5Z15VT1G, BZX585 series, BZX84J series) are ROHS3 compliant. The original MM5Z15VT5G is marked as REACH Unaffected but does not specify ROHS3 status due to its obsolete classification. For new designs, select active parts with explicit ROHS3 compliance.

Q: What is the significance of AEC-Q100 and AEC-Q101 qualifications?

A: AEC-Q100 and AEC-Q101 are automotive industry reliability qualifications. AEC-Q101 applies to discrete semiconductors including Zener diodes. Parts carrying these qualifications have undergone enhanced testing for automotive applications. SZMM5Z15VT1G (AEC-Q101) and BZX585 series (AEC-Q100) are suitable for automotive and mission-critical applications. Non-qualified parts are suitable for general industrial and consumer applications.

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