MM5Z15V Equivalent & Substitute Parts

Part Overview

The MM5Z15V is a 15 V Zener diode manufactured by onsemi, rated for 200 mW power dissipation in a surface mount SOD-523F package. This component is classified as obsolete, indicating that direct procurement from the original manufacturer may be limited or unavailable. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production requirements for applications utilizing 15 V Zener regulation in compact surface mount form factors.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	15	V
Tolerance	±5%	-
Power - Max	200	mW
Impedance (Max)	30	Ohms
Current - Reverse Leakage @ Vr	50	nA @ 10.5 V
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	-
Package / Case	SC-79, SOD-523F	-
Moisture Sensitivity Level	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitution of the MM5Z15V is determined by strict alignment of the following electrical and mechanical parameters:

Critical Parameters for Substitution:

Zener voltage: 15 V nominal
Tolerance: ±5% or tighter
Package type: SOD-523 or SOD-523F (SC-79)
Mounting type: Surface Mount
Operating temperature range: Must encompass or exceed -55°C to 150°C
Moisture sensitivity: MSL 1 (Unlimited)

Power Rating Consideration: Substitute parts with power ratings equal to or greater than 200 mW are acceptable. Parts with higher power ratings (300 mW, 500 mW, 550 mW) provide enhanced thermal margin and are direct functional replacements. Parts with lower power ratings are not suitable.

Impedance and Leakage: Impedance values of 30 Ohms or lower are acceptable. Reverse leakage current specifications of 50 nA or lower at 10.5 V meet the requirement.

Compliance and Packaging: All substitute parts listed maintain SOD-523 package compatibility with the original SOD-523F specification. RoHS3 compliance and REACH unaffected status are standard across active alternatives.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Impedance (Ohms)	Leakage @ 10.5V (nA)	Temp Range (°C)	Package	Status
MM5Z15V	onsemi	15	±5%	200	30	50	-55 to 150	SOD-523F	Obsolete
MM5Z15VT1G	onsemi	15	±5%	500	30	50	-65 to 150	SOD-523	Active
BZX584C15_R1_00001	Panjit International Inc.	15	±5%	200	30	100	-55 to 150	SOD-523	Active
BZX585-B15,115	Nexperia USA Inc.	15	±2%	300	15	50	-65 to 150	SOD-523	Active
BZX585-B15,135	Nexperia USA Inc.	15	±2%	300	15	50	-65 to 150	SOD-523	Active
BZX585-C15,115	Nexperia USA Inc.	15	±5%	300	15	50	-65 to 150	SOD-523	Active
BZX585-C15,135	Nexperia USA Inc.	15	±5%	300	15	50	-65 to 150	SOD-523	Active
BZX84J-B15,115	Nexperia USA Inc.	15	±2%	550	15	50	-65 to 150	SOD-323F	Active

Engineering Selection Recommendations

Direct Replacement (Same Power Rating): BZX584C15_R1_00001 from Panjit International Inc. provides a direct 200 mW equivalent to the MM5Z15V. This part maintains identical power dissipation capability and operating temperature range. The part is active and in stock, making it suitable for immediate substitution in applications where the original 200 mW specification is required.

Enhanced Performance Alternatives (Higher Power Rating): MM5Z15VT1G (onsemi, 500 mW), BZX585-B15,115, BZX585-B15,135, BZX585-C15,115, and BZX585-C15,135 (all Nexperia, 300 mW) offer increased power dissipation margins. These parts are active and provide superior thermal performance. The onsemi MM5Z15VT1G maintains manufacturer continuity while offering 2.5× power rating improvement. Nexperia BZX585 series parts feature tighter impedance specifications (15 Ohms vs. 30 Ohms) and automotive-grade qualification (AEC-Q100).

Extended Temperature Range Option: All substitute parts except BZX584C15_R1_00001 extend the lower operating temperature limit to -65°C, providing enhanced cold-temperature performance compared to the original -55°C specification.

Automotive Applications: BZX585-B15,115, BZX585-B15,135, BZX585-C15,115, and BZX585-C15,135 carry AEC-Q100 automotive qualification. BZX84J-B15,115 carries AEC-Q101 qualification and is suitable for automotive-grade applications requiring higher power dissipation in a SOD-323F package.

Tolerance Considerations: BZX585-B15,115, BZX585-B15,135, and BZX84J-B15,115 offer ±2% tolerance, providing tighter voltage regulation compared to the ±5% specification of the original part and most alternatives. This enhanced precision is beneficial for applications with strict voltage regulation requirements.

Frequently Asked Questions (FAQ)

Q: Can MM5Z15VT1G replace MM5Z15V directly? A: Yes. MM5Z15VT1G is an active onsemi product with identical 15 V Zener voltage and ±5% tolerance. It provides 500 mW power rating versus the original 200 mW, offering enhanced thermal margin. The SOD-523 package is mechanically compatible with SOD-523F footprints. Extended temperature range (-65°C to 150°C) exceeds the original specification.

Q: What is the difference between BZX585-B15 and BZX585-C15 variants? A: Both series share identical electrical specifications (15 V Zener, 300 mW, 15 Ohms impedance, AEC-Q100 qualification). The primary difference is tolerance: BZX585-B15 offers ±2% tolerance, while BZX585-C15 offers ±5% tolerance. The suffix designations (,115 and ,135) indicate packaging and reel configurations. Selection depends on voltage regulation precision requirements.

Q: Is BZX84J-B15,115 compatible with MM5Z15V applications? A: BZX84J-B15,115 is electrically compatible (15 V Zener, ±2% tolerance, AEC-Q101 automotive qualification). However, it uses SOD-323F package (SC-90) instead of SOD-523F (SC-79). PCB footprint redesign is required. The 550 mW power rating provides significant thermal margin. This part is suitable for applications where package size change is acceptable.

Q: Why do some substitutes have lower impedance values? A: Nexperia BZX585 series parts feature 15 Ohms maximum impedance compared to 30 Ohms in the original MM5Z15V. Lower impedance provides better voltage regulation stability and reduced dynamic impedance effects. This is a performance enhancement, not a limitation.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All active substitute parts listed carry RoHS3 compliance and REACH unaffected status, meeting current environmental and regulatory requirements.

Q: What is the inventory status of substitute parts? A: MM5Z15VT1G (35,200 pcs), BZX585-C15,135 (20,756 pcs), BZX585-B15,115 (23,775 pcs), BZX585-C15,115 (15,300 pcs), BZX584C15_R1_00001 (14,499 pcs), and BZX84J-B15,115 (99,170 pcs) are all in active stock. BZX585-B15,135 has limited availability (995 pcs).

Q: Can I use a higher power-rated Zener diode in place of the 200 mW MM5Z15V? A: Yes. Higher power-rated parts (300 mW, 500 mW, 550 mW) are direct functional replacements. They provide identical Zener voltage regulation with enhanced thermal dissipation capability. No circuit modifications are required. This substitution improves reliability and thermal margin.

Q: What packaging format should I specify for production? A: Packaging options include Cut Tape (CT) & Digi-Reel® and Tape & Reel (TR). MM5Z15VT1G and BZX585-C15,115 are available in CT & Digi-Reel® format. BZX584C15_R1_00001, BZX585-B15,115, BZX585-B15,135, BZX585-C15,135, and BZX84J-B15,115 are available in Tape & Reel format. Select based on assembly equipment and volume requirements.

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