DL5252B-TP Equivalent & Substitute Parts

Part Overview

The DL5252B-TP is a Zener diode rated at 24 V nominal voltage with 500 mW power dissipation, manufactured by Micro Commercial Co in a Mini MELF surface mount package. This component is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement. The part maintains ROHS3 compliance and unlimited moisture sensitivity rating, making it suitable for industrial and commercial applications requiring stable voltage regulation.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	24	V
Tolerance	±5	%
Power - Max	500	mW
Impedance (Max)	33	Ohms
Current - Reverse Leakage @ Vr	100 nA @ 18 V	nA
Voltage - Forward (Vf) (Max)	1.1 V @ 200 mA	V
Operating Temperature Range	-65°C to 175°C	°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 DL5252B-TP is determined by electrical parameter equivalence across the following criteria:

Electrical Equivalence Requirements:

Zener voltage (Vz) must match at 24 V nominal
Tolerance must remain within ±5%
Power dissipation rating must equal or exceed 500 mW
Impedance (Zzt) must not exceed 33 Ohms
Reverse leakage current must not exceed 100 nA @ 18 V

Mechanical Compatibility Considerations:

Surface mount mounting type is required
Package form factor differences necessitate PCB layout evaluation
Operating temperature range must support application requirements

The MMSZ5252B-TP qualifies as a functional substitute based on matching electrical specifications. The primary distinction lies in package configuration (SOD-123 versus Mini MELF) and operating temperature range variance.

Parameter Comparison

Parameter	DL5252B-TP (Main Part)	MMSZ5252B-TP (Substitute)	Match Status
Voltage - Zener (Nom)	24 V	24 V	Equivalent
Tolerance	±5%	±5%	Equivalent
Power - Max	500 mW	500 mW	Equivalent
Impedance (Max)	33 Ohms	33 Ohms	Equivalent
Current - Reverse Leakage @ Vr	100 nA @ 18 V	100 nA @ 18 V	Equivalent
Voltage - Forward (Vf) (Max)	1.1 V @ 200 mA	900 mV @ 10 mA	Different Test Conditions
Operating Temperature Range	-65°C to 175°C	-55°C to 150°C	Reduced Range
Mounting Type	Surface Mount	Surface Mount	Equivalent
Package / Case	DO-213AC, MINI-MELF, SOD-80	SOD-123	Different Package
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Equivalent

Engineering Selection Recommendations

DL5252B-TP (Obsolete Status): The main part is classified as obsolete. While 739 units remain in current inventory, long-term procurement is not assured. This part should be considered for end-of-life applications only or where existing stock is available for immediate use.

MMSZ5252B-TP (Active Status): This substitute maintains active product status with 9200 units in inventory, ensuring sustained availability for new designs and ongoing production. Both parts carry ROHS3 compliance and unlimited moisture sensitivity rating, meeting equivalent regulatory requirements.

Critical Consideration: The operating temperature range of MMSZ5252B-TP (-55°C to 150°C) is narrower than the DL5252B-TP (-65°C to 175°C). Applications requiring operation below -55°C or above 150°C must retain the original part specification or identify alternative solutions.

Package Transition: Migration from Mini MELF (DO-213AC) to SOD-123 packaging requires PCB layout modification. Both packages are surface mount configurations with different footprint geometries and land patterns.

Frequently Asked Questions (FAQ)

Q: Can MMSZ5252B-TP directly replace DL5252B-TP without circuit modification?

A: Electrical substitution is valid based on matching Zener voltage, tolerance, power rating, impedance, and reverse leakage specifications. However, package geometry differs (SOD-123 versus Mini MELF), requiring PCB footprint redesign and revalidation of thermal management characteristics.

Q: What is the significance of the operating temperature range difference?

A: The MMSZ5252B-TP operates from -55°C to 150°C, compared to the DL5252B-TP range of -65°C to 175°C. Applications requiring operation outside the MMSZ5252B-TP range must use the original part or identify alternative components with extended temperature specifications.

Q: Are the forward voltage specifications directly comparable?

A: No. The DL5252B-TP specifies 1.1 V @ 200 mA, while MMSZ5252B-TP specifies 900 mV @ 10 mA. These measurements occur at different test currents and cannot be directly compared. Both values remain within acceptable Zener diode forward conduction characteristics.

Q: Why is MMSZ5252B-TP preferred for new designs?

A: MMSZ5252B-TP maintains active product status with higher inventory availability (9200 units versus 739 units). The DL5252B-TP is obsolete, limiting long-term procurement viability for production quantities.

Q: Do both parts meet the same compliance standards?

A: Yes. Both DL5252B-TP and MMSZ5252B-TP are ROHS3 compliant, REACH unaffected, and carry unlimited moisture sensitivity rating (MSL 1). Regulatory compliance is equivalent between the two parts.

Q: What PCB design considerations apply when switching packages?

A: Mini MELF (DO-213AC) and SOD-123 packages have different footprint dimensions, pad spacing, and thermal characteristics. PCB layout must be redesigned to accommodate the new package geometry, and thermal analysis should be revalidated to ensure adequate heat dissipation in the application environment.

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