MMSZ5252C-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The MMSZ5252C-TP is a 24 V, 500 mW surface mount zener diode manufactured by Micro Commercial Co in SOD-123 package. This component is classified as an interface diode and maintains Active product status. Equivalent and substitute parts are identified based on matching electrical specifications and mechanical compatibility within the zener diode category. Alternative sources become necessary to address inventory availability, supply chain continuity, or specific manufacturing certifications required for particular applications.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	24	V
Power - Maximum	500	mW
Tolerance	±2%	-
Impedance (Maximum)	33	Ohms
Current - Reverse Leakage @ Vr	100	nA @ 18 V
Voltage - Forward (Maximum) @ If	900	mV @ 10 mA
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	-
Package / Case	SOD-123	-

Substitute Part Grouping Explanation

Substitution of the MMSZ5252C-TP is determined by the following critical parameters:

Primary Matching Criteria:

Zener voltage: 24 V nominal
Package type: SOD-123 surface mount
Mounting configuration: Surface mount technology

Secondary Compatibility Factors:

Power dissipation rating: 500 mW or greater
Voltage tolerance: ±2% to ±6% acceptable range
Operating temperature range: -55°C to 150°C minimum
Reverse leakage current: 100 nA or lower @ specified voltage
Forward voltage: 900 mV maximum @ 10 mA

All identified substitute parts meet the primary matching criteria and operate within the secondary compatibility parameters. Variations in impedance, tolerance, and reverse leakage specifications remain within acceptable engineering limits for zener diode applications requiring 24 V regulation in SOD-123 packages.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Power (mW)	Tolerance	Zzt (Ohms)	Ir @ Vr (nA)	Vf @ If (mV)	Temp Range (°C)	Package
MMSZ5252C-TP	Micro Commercial Co	24	500	±2%	33	100 @ 18 V	900 @ 10 mA	-55 to 150	SOD-123
MMSZ5252B-7-F	Diodes Incorporated	24	500	±5%	33	100 @ 18 V	900 @ 10 mA	-65 to 150	SOD-123
BZT52C24-7-F	Diodes Incorporated	24	500	±6%	70	100 @ 16.8 V	900 @ 10 mA	-65 to 150	SOD-123
BZT52B24-E3-08	Vishay General Semiconductor	24	410	±2%	70	100 @ 18 V	-	-55 to 150	SOD-123
MMSZ4709-E3-18	Vishay General Semiconductor	24	500	±5%	-	10 @ 18.2 V	-	-55 to 150	SOD-123
SZMMSZ24T1G	onsemi	24	500	±5%	70	50 @ 16.8 V	900 @ 10 mA	-55 to 150	SOD-123

Engineering Selection Recommendations

Direct Equivalents (Identical Specifications): MMSZ5252B-7-F from Diodes Incorporated provides the closest electrical match with identical 24 V nominal voltage, 500 mW power rating, 33 Ohm impedance, and ±5% tolerance. This part extends the operating temperature range to -65°C and carries RoHS3 compliance with MSL 1 rating.

High-Tolerance Substitutes (±2% Tolerance Match): BZT52B24-E3-08 from Vishay General Semiconductor maintains the ±2% tolerance specification of the original part. Power dissipation is reduced to 410 mW, which remains suitable for applications not requiring full 500 mW capability. This part is RoHS3 compliant with MSL 1 rating.

Automotive-Grade Alternative: SZMMSZ24T1G from onsemi is qualified to AEC-Q101 automotive standard and carries automotive-grade designation. This part maintains 500 mW power rating, ±5% tolerance, and -55°C to 150°C operating range. Reverse leakage is reduced to 50 nA, providing superior performance in leakage-sensitive applications.

General-Purpose Substitutes: BZT52C24-7-F and MMSZ4709-E3-18 function as general-purpose alternatives with 24 V nominal voltage and 500 mW power rating. Both parts are RoHS3 compliant. BZT52C24-7-F extends temperature range to -65°C with ±6% tolerance. MMSZ4709-E3-18 offers superior reverse leakage performance at 10 nA.

All substitute parts maintain SOD-123 surface mount packaging and are classified as Active products with REACH Unaffected status.

Frequently Asked Questions (FAQ)

Q: Can MMSZ5252C-TP be replaced with BZT52B24-E3-08? A: Yes. Both parts share 24 V nominal voltage, SOD-123 package, and -55°C to 150°C operating range. BZT52B24-E3-08 has reduced power rating (410 mW versus 500 mW) and higher impedance (70 Ohms versus 33 Ohms), but maintains ±2% tolerance matching the original specification.

Q: What is the difference between ±2% and ±5% tolerance in zener diodes? A: Tolerance specifies the accuracy of the nominal zener voltage. MMSZ5252C-TP with ±2% tolerance maintains zener voltage between 23.52 V and 24.48 V. Substitute parts with ±5% tolerance maintain voltage between 22.8 V and 25.2 V. Selection depends on circuit regulation requirements.

Q: Is SZMMSZ24T1G suitable for automotive applications? A: Yes. SZMMSZ24T1G carries AEC-Q101 automotive qualification and automotive-grade designation. This part is appropriate for automotive and high-reliability applications requiring certified components.

Q: Why does BZT52C24-7-F have higher impedance than the original part? A: Impedance variation reflects different semiconductor design and manufacturing processes between manufacturers. Both 33 Ohm and 70 Ohm impedance values are acceptable for 24 V zener applications. Circuit performance impact depends on specific load conditions and source impedance.

Q: Can all substitute parts be used in the same PCB footprint? A: Yes. All substitute parts use SOD-123 surface mount package with identical footprint dimensions. Direct PCB substitution is possible without layout modifications.

Q: What does MSL 1 (Unlimited) moisture sensitivity level mean? A: MSL 1 indicates the component has unlimited shelf life and requires no special moisture control during storage or handling. Standard storage conditions are acceptable without desiccant packs or controlled humidity environments.

Q: Which substitute part has the lowest reverse leakage current? A: MMSZ4709-E3-18 has the lowest reverse leakage at 10 nA @ 18.2 V, compared to 100 nA in the original MMSZ5252C-TP. This characteristic is beneficial in applications sensitive to leakage current.

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