MM5Z24V Zener Diode Equivalent & Substitute Parts

Part Overview

The MM5Z24V is a 24 V zener diode rated at 200 mW in a surface mount SOD-523F package, manufactured by onsemi. This component is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design requirements and production continuity. The part maintains a nominal zener voltage of 24 V with ±6% tolerance and is suitable for voltage regulation and protection applications in surface mount assemblies.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	24	V
Tolerance	±6%	-
Power - Max	200	mW
Impedance (Max)	70	Ohms
Current - Reverse Leakage @ Vr	50	nA @ 16.8 V
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	-
Package / Case	SC-79, SOD-523F	-
Product Status	Obsolete	-

Substitute Part Grouping Explanation

Substitution of the MM5Z24V is determined by the following critical parameters: nominal zener voltage (24 V), voltage tolerance, maximum power dissipation capability, impedance characteristics, reverse leakage current, operating temperature range, and surface mount package compatibility.

Substitute parts are grouped into two categories:

Direct Functional Equivalents: Parts that maintain the 24 V zener voltage specification with compatible package types (SOD-523 or SOD-523F) and equivalent or superior electrical characteristics. These parts support direct replacement in applications where the original 200 mW power rating is sufficient or where higher power ratings provide design margin.

Compatible Alternatives with Package Variation: Parts that maintain the 24 V zener voltage and core electrical specifications but utilize alternative surface mount packages (SOD-323F) with different physical dimensions and thermal characteristics. These require mechanical and thermal validation before implementation.

The following parameters determine substitution eligibility:

Nominal zener voltage: 24 V (required)
Voltage tolerance: ±2% to ±6% (acceptable range)
Power rating: 150 mW minimum to 550 mW maximum
Impedance: 30 to 70 Ohms
Reverse leakage: 50 to 100 nA @ specified voltage
Operating temperature: -65°C to 150°C minimum range
Mounting type: Surface mount (required)
Package: SOD-523, SOD-523F, or SOD-323F

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Ir @ Vr	Temp Range	Package	Status
MM5Z24V	onsemi	24 V	±6%	200 mW	70 Ω	50 nA @ 16.8 V	-55 to 150°C	SOD-523F	Obsolete
MM5Z24VT1G	onsemi	24 V	±6%	500 mW	70 Ω	50 nA @ 16.8 V	-65 to 150°C	SOD-523	Active
BZX584C24_R1_00001	Panjit International Inc.	24 V	±5%	200 mW	70 Ω	100 nA @ 16.8 V	-55 to 150°C	SOD-523	Active
BZX585-B24,115	Nexperia USA Inc.	24 V	±2%	300 mW	70 Ω	50 nA @ 16.8 V	-65 to 150°C	SOD-523	Active
BZX585-C24,115	NXP Semiconductors	24 V	±5%	300 mW	70 Ω	50 nA @ 16.8 V	-65 to 150°C	SOD-523	Active
BZX84J-B24,115	Nexperia USA Inc.	24 V	±2%	550 mW	30 Ω	50 nA @ 16.8 V	-65 to 150°C	SOD-323F	Active
DDZ9709T-7	Diodes Incorporated	24 V	±5%	150 mW	-	50 nA @ 18.2 V	-65 to 150°C	SOD-523	Active

Engineering Selection Recommendations

MM5Z24VT1G (onsemi): This part is the primary direct substitute. It maintains the same manufacturer lineage, identical zener voltage and tolerance, and equivalent impedance. The 500 mW power rating exceeds the original 200 mW specification, providing design margin. The extended temperature range (-65°C to 150°C) offers improved low-temperature performance. The SOD-523 package is mechanically compatible with SOD-523F footprints. Product status is active with full RoHS3 compliance.

BZX585-C24,115 (NXP Semiconductors): This part provides 300 mW power capability with ±5% tolerance and active product status. It maintains the 70 Ohm impedance and equivalent reverse leakage characteristics. The extended temperature range and RoHS3 compliance support modern design requirements. High inventory availability (252,265 units) ensures supply continuity.

BZX585-B24,115 (Nexperia USA Inc.): This automotive-grade part (AEC-Q100 qualified) offers ±2% tolerance, superior to the original ±6% specification. The 300 mW power rating and extended temperature range provide design flexibility. Automotive qualification is applicable for safety-critical applications.

BZX584C24_R1_00001 (Panjit International Inc.): This part matches the original 200 mW power rating and operating temperature range. The ±5% tolerance is tighter than the original specification. It serves as a direct functional equivalent for applications with strict power budget constraints.

BZX84J-B24,115 (Nexperia USA Inc.): This part utilizes the SOD-323F package, which differs physically from the SOD-523F. The 550 mW power rating and ±2% tolerance provide superior performance. The reduced impedance (30 Ohms) improves voltage regulation characteristics. AEC-Q101 automotive qualification and active status support demanding applications. Package change requires PCB layout validation.

DDZ9709T-7 (Diodes Incorporated): This part provides the lowest power rating (150 mW) among active substitutes. It is suitable for applications with minimal power dissipation requirements. The ±5% tolerance and active status support standard industrial applications.

Frequently Asked Questions (FAQ)

Q: Can MM5Z24VT1G directly replace MM5Z24V without PCB modifications?

A: Yes. The MM5Z24VT1G uses the SOD-523 package, which is mechanically compatible with SOD-523F footprints. Both packages share the same lead pitch and mounting area. No PCB layout changes are required.

Q: What is the significance of the ±2% tolerance in BZX585-B24,115 compared to the original ±6%?

A: The ±2% tolerance provides tighter zener voltage control, resulting in more precise voltage regulation. This is beneficial in applications requiring strict output voltage specifications. The original ±6% tolerance is acceptable for general-purpose voltage clamping and protection circuits.

Q: Is BZX84J-B24,115 suitable as a direct replacement despite the SOD-323F package difference?

A: The SOD-323F package requires mechanical and thermal validation. While the electrical specifications are compatible, the different physical dimensions and thermal characteristics necessitate PCB layout review. Thermal performance may differ due to package geometry variations.

Q: Which substitute part offers the best supply availability?

A: BZX585-C24,115 provides the highest inventory level (252,265 units), ensuring long-term supply continuity. MM5Z24VT1G (125,300 units) and BZX84J-B24,115 (263,906 units) also maintain substantial stock levels.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All active substitute parts listed carry RoHS3 compliance certification, meeting current environmental and regulatory requirements.

Q: What is the difference between automotive-grade parts (BZX585-B24,115) and standard industrial parts?

A: Automotive-grade parts carry AEC-Q100 or AEC-Q101 qualification, indicating compliance with automotive reliability and quality standards. These parts undergo additional testing for temperature cycling, moisture resistance, and long-term stability. They are required for safety-critical automotive applications but are also suitable for industrial applications requiring enhanced reliability.

Q: Can DDZ9709T-7 be used in applications originally designed for MM5Z24V?

A: DDZ9709T-7 is suitable only for applications where power dissipation does not exceed 150 mW. The original MM5Z24V is rated at 200 mW. Applications requiring the full 200 mW power capability must use alternative substitutes with higher power ratings.

Q: What is the impact of impedance differences between substitute parts?

A: Impedance affects voltage regulation quality and transient response. The original MM5Z24V and most substitutes maintain 70 Ohm impedance. BZX84J-B24,115 offers lower impedance (30 Ohms), providing superior voltage regulation and faster transient response. Lower impedance is advantageous in precision voltage regulation circuits.

Q: Are all substitute parts suitable for the full -55°C to 150°C temperature range of the original part?

A: Most substitutes support -65°C to 150°C, exceeding the original range. DDZ9709T-7 and BZX584C24_R1_00001 maintain the original -55°C lower limit. For applications operating below -55°C, verify specific part temperature specifications.

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