DL5258B-TP Equivalent & Substitute Parts

Part Overview

The DL5258B-TP is a Zener diode rated at 36 V with 500 mW power dissipation in a Mini MELF surface mount package. Manufactured by Micro Commercial Co, this component is classified as obsolete. Due to its obsolete status and limited availability relative to active alternatives, equivalent substitute parts are necessary to maintain design continuity and ensure long-term supply chain reliability for applications requiring 36 V Zener regulation.

Key Parameters

Parameter	Value
Voltage - Zener (Nom)	36 V
Tolerance	±5%
Power - Max	500 mW
Impedance (Max)	70 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 27 V
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the DL5258B-TP are qualified based on the following electrical and mechanical parameters:

Electrical Equivalence Criteria:

Zener voltage: 36 V nominal
Tolerance: ±5%
Power rating: 500 mW
Impedance (Max): 70 Ohms
Reverse leakage current: 100 nA @ 27 V

Mechanical Compatibility Criteria:

Mounting type: Surface Mount
Environmental compliance: RoHS3 Compliant
Moisture sensitivity: MSL 1 (Unlimited)

Parts meeting these criteria are functionally equivalent and may be substituted in applications where the DL5258B-TP is specified. Package form factor differences (Mini MELF, SOD-123, DO-213AA) do not affect electrical performance but require PCB layout verification.

Parameter Comparison

Parameter	DL5258B-TP	MMSZ5258B-TP	1N5258BUR-1
Manufacturer	Micro Commercial Co	Micro Commercial Co	Microchip Technology
Voltage - Zener (Nom)	36 V	36 V	36 V
Tolerance	±5%	±5%	±5%
Power - Max	500 mW	500 mW	500 mW
Impedance (Max)	70 Ohms	70 Ohms	70 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 27 V	100 nA @ 27 V	100 nA @ 27 V
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	DO-213AC, MINI-MELF, SOD-80	SOD-123	DO-213AA
Operating Temperature	-65°C ~ 175°C	-55°C ~ 150°C	-65°C ~ 175°C
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant

Engineering Selection Recommendations

MMSZ5258B-TP (Micro Commercial Co): This substitute is electrically equivalent to the DL5258B-TP across all critical parameters. It maintains ROHS3 compliance and is currently in active production with substantial inventory availability (6764 pcs). The primary difference is package form factor (SOD-123 versus Mini MELF), which requires PCB layout modification. Operating temperature range is reduced to -55°C ~ 150°C. Selection of this part is appropriate for applications where the narrower temperature range is acceptable and PCB redesign is feasible.

1N5258BUR-1 (Microchip Technology): This substitute provides electrical equivalence and maintains the full operating temperature range (-65°C ~ 175°C) of the original part. However, it is RoHS non-compliant, which may restrict use in applications subject to RoHS regulations. Package form factor is DO-213AA. This part is suitable for legacy applications or environments where RoHS compliance is not required.

Frequently Asked Questions (FAQ)

Q: Can MMSZ5258B-TP be used as a direct replacement for DL5258B-TP without circuit modification?

A: MMSZ5258B-TP is electrically equivalent but uses a different package form factor (SOD-123 versus Mini MELF). PCB layout and footprint modifications are required. Electrical performance is identical.

Q: What is the impact of the operating temperature range difference between DL5258B-TP and MMSZ5258B-TP?

A: DL5258B-TP operates from -65°C to 175°C, while MMSZ5258B-TP operates from -55°C to 150°C. Applications requiring operation below -55°C or above 150°C must use 1N5258BUR-1 or the original part.

Q: Is 1N5258BUR-1 suitable for RoHS-compliant applications?

A: No. 1N5258BUR-1 is RoHS non-compliant. For RoHS-compliant designs, use MMSZ5258B-TP or the original DL5258B-TP.

Q: Are all three parts electrically interchangeable in terms of Zener voltage and power rating?

A: Yes. All three parts share identical Zener voltage (36 V), tolerance (±5%), power rating (500 mW), impedance (70 Ohms max), and reverse leakage current (100 nA @ 27 V) specifications.

Q: What packaging considerations apply when substituting these parts?

A: DL5258B-TP uses Mini MELF (DO-213AC/SOD-80) package. MMSZ5258B-TP uses SOD-123 package. 1N5258BUR-1 uses DO-213AA package. Each requires different PCB footprints and land patterns. Verify PCB layout compatibility before implementation.

Q: Which substitute part has the best inventory availability?

A: MMSZ5258B-TP has the highest inventory level at 6764 pcs in stock, compared to 754 pcs for 1N5258BUR-1.

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