ZMM5252B-7 Equivalent & Substitute Parts

Part Overview

The ZMM5252B-7 is a 24 V, 500 mW Zener diode manufactured by Diodes Incorporated in Mini MELF surface mount packaging. This component is classified as obsolete, indicating that the original part is no longer in active production. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing manufacturing requirements for applications utilizing this Zener diode specification.

Key Parameters

Parameter	Value
Voltage - Zener (Nom)	24 V
Tolerance	±5%
Power - Max	500 mW
Impedance (Max)	33 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 18 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA
Operating Temperature	-65°C ~ 175°C
Mounting Type	Surface Mount
Package / Case	DO-213AC, MINI-MELF, SOD-80
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the ZMM5252B-7 is determined by strict electrical and mechanical parameter matching. The following criteria establish valid equivalency:

Primary Matching Criteria:

Voltage - Zener (Nom): 24 V (exact match required)
Tolerance: ±5% (exact match required for direct substitution)
Power - Max: 500 mW (exact match required)
Impedance (Max): 33 Ohms (exact match required)
Current - Reverse Leakage @ Vr: 100 nA @ 18 V (exact match required)
Operating Temperature Range: -65°C ~ 175°C (minimum requirement)
Mounting Type: Surface Mount (required)

Secondary Considerations:

Package / Case: Different surface mount packages (SOD-123, DO-213AA, DO-213AB, SOD-80) are acceptable provided electrical parameters match
Manufacturer: Substitutes from different manufacturers are acceptable if all electrical specifications are met
Product Status: Active status substitutes are preferred for obsolete parts

Substitute parts are grouped by package type and tolerance specification. Parts with tolerance variations (±10%, ±20%) are listed separately as they represent different electrical performance classes.

Parameter Comparison

Parameter	ZMM5252B-7	MMSZ5252B-7-F	1N5252BUR-1	CDLL5252B	TZMC24-M-08
Manufacturer	Diodes Incorporated	Diodes Incorporated	Microchip Technology	Microchip Technology	Vishay General Semiconductor
Voltage - Zener (Nom)	24 V	24 V	24 V	24 V	24 V
Tolerance	±5%	±5%	±5%	±5%	±5%
Power - Max	500 mW	500 mW	500 mW	Not Specified	500 mW
Impedance (Max)	33 Ohms	33 Ohms	33 Ohms	33 Ohms	80 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 18 V	100 nA @ 18 V	100 nA @ 18 V	100 nA @ 18 V	100 nA @ 18 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA	900 mV @ 10 mA	1.5 V @ 200 mA	1.1 V @ 200 mA	1.5 V @ 200 mA
Operating Temperature	-65°C ~ 175°C	-65°C ~ 150°C	-65°C ~ 175°C	-65°C ~ 175°C	-65°C ~ 175°C
Package / Case	DO-213AC, MINI-MELF, SOD-80	SOD-123	DO-213AA	DO-213AB, MELF	DO-213AC, MINI-MELF, SOD-80
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Not Specified	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

MMSZ5252B-7-F (Diodes Incorporated) and TZMC24-M-08 (Vishay General Semiconductor) are the preferred substitutes for the ZMM5252B-7. Both parts maintain identical electrical specifications (24 V, ±5%, 500 mW, 33 Ohms impedance) and are in active production status. MMSZ5252B-7-F uses SOD-123 packaging, while TZMC24-M-08 maintains the original SOD-80 Mini MELF package. Both are ROHS3 compliant. TZMC24-M-08 carries AEC-Q101 automotive qualification, providing additional reliability assurance for automotive applications.

Secondary Substitutes (Electrical Equivalence with Package Variation):

1N5252BUR-1 (Microchip Technology) provides full electrical equivalence with identical 24 V, ±5%, 500 mW specifications and operating temperature range (-65°C ~ 175°C). The part uses DO-213AA glass packaging instead of Mini MELF. This substitute is suitable for applications where package footprint differences are accommodated in board design.

CDLL5252B (Microchip Technology) matches all critical electrical parameters (24 V, ±5%, 33 Ohms impedance, 100 nA reverse leakage) and operates across the full temperature range (-65°C ~ 175°C). This part uses DO-213AB MELF packaging. Note that CDLL5252B is RoHS non-compliant, which may restrict use in applications requiring RoHS compliance.

Alternative Tolerance Options:

CDLL5252A (±10% tolerance) and CDLL5252 (±20% tolerance) are available from Microchip Technology for applications where tighter tolerance is not required. These parts maintain the same 24 V nominal voltage, 33 Ohms impedance, and full temperature range but with relaxed tolerance specifications.

Impedance Deviation:

TZMC24-M-08 specifies 80 Ohms maximum impedance compared to the 33 Ohms of the original part. This impedance difference may affect circuit performance in applications with strict impedance requirements.

Frequently Asked Questions (FAQ)

Q: Can MMSZ5252B-7-F replace ZMM5252B-7 directly?

A: MMSZ5252B-7-F is electrically equivalent with identical voltage (24 V), tolerance (±5%), power rating (500 mW), and impedance (33 Ohms) specifications. The primary difference is packaging: MMSZ5252B-7-F uses SOD-123 while ZMM5252B-7 uses Mini MELF. Direct replacement requires PCB layout modification to accommodate the different package footprint.

Q: What is the difference between CDLL5252, CDLL5252A, and CDLL5252B?

A: These three parts are identical except for tolerance specification. CDLL5252 has ±20% tolerance, CDLL5252A has ±10% tolerance, and CDLL5252B has ±5% tolerance. All three maintain 24 V nominal voltage and 33 Ohms impedance. Selection depends on the tolerance requirement of the application.

Q: Is TZMC24-M-08 suitable for automotive applications?

A: TZMC24-M-08 carries AEC-Q101 automotive qualification and is graded for automotive use. This part is suitable for automotive applications requiring qualified components. The 80 Ohms impedance specification differs from the original 33 Ohms, which should be evaluated for circuit compatibility.

Q: Why does MMSZ5252B-7-F have a lower maximum operating temperature than ZMM5252B-7?

A: MMSZ5252B-7-F specifies -65°C ~ 150°C operating temperature compared to ZMM5252B-7 at -65°C ~ 175°C. Applications requiring operation above 150°C should use alternative substitutes such as 1N5252BUR-1, CDLL5252B, or TZMC24-M-08, which all support the full -65°C ~ 175°C range.

Q: Are there RoHS compliance differences between substitutes?

A: MMSZ5252B-7-F and TZMC24-M-08 are ROHS3 compliant, matching the original ZMM5252B-7. CDLL5252, CDLL5252A, and CDLL5252B are RoHS non-compliant. Applications requiring RoHS compliance must use MMSZ5252B-7-F, TZMC24-M-08, or 1N5252BUR-1.

Q: What is the significance of the impedance specification difference in TZMC24-M-08?

A: TZMC24-M-08 specifies 80 Ohms maximum impedance compared to 33 Ohms in the original part. Impedance affects circuit transient response and voltage regulation characteristics. Applications with impedance-sensitive circuits should evaluate this parameter before substitution.

Q: Can I use 1N5252BUR-1 in place of ZMM5252B-7?

A: 1N5252BUR-1 provides full electrical equivalence with identical 24 V, ±5%, 500 mW specifications and -65°C ~ 175°C operating range. The primary difference is packaging: 1N5252BUR-1 uses DO-213AA glass package instead of Mini MELF. Substitution requires PCB layout modification.

Q: Which substitute offers the best long-term availability?

A: MMSZ5252B-7-F, 1N5252BUR-1, CDLL5252B, and TZMC24-M-08 are all in active production status, providing superior long-term availability compared to the obsolete ZMM5252B-7. TZMC24-M-08 offers additional assurance through automotive qualification and AEC-Q101 certification.

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