DL5255B-TP Equivalent & Substitute Parts

Part Overview

The DL5255B-TP is a Zener diode rated at 28 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 continuity. The part operates across a temperature range of -65°C to 175°C and maintains ±5% voltage tolerance with RoHS3 compliance.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	28	V
Tolerance	±5	%
Power - Max	500	mW
Impedance (Max)	44	Ohms
Current - Reverse Leakage @ Vr	100 nA @ 21 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	—

Substitute Part Grouping Explanation

Substitution of the DL5255B-TP is determined by equivalence across the following critical parameters: nominal Zener voltage (28 V), voltage tolerance (±5%), maximum power dissipation (500 mW), impedance specification (44 Ohms maximum), reverse leakage current (100 nA @ 21 V), and forward voltage characteristics (1.1 V @ 200 mA). All identified substitute parts maintain these electrical specifications. Package and mounting type differences are secondary considerations that may require PCB layout modification but do not affect electrical performance within the specified operating envelope.

The substitute parts are grouped into two categories based on product status and compliance posture: active production alternatives and legacy equivalents. Package variants (Mini MELF, SOD-123, and DO-213AA) represent different physical form factors suitable for different PCB designs while maintaining identical electrical performance.

Parameter Comparison

Parameter	DL5255B-TP	MMSZ5255B-TP	1N5255BUR-1
Manufacturer	Micro Commercial Co	Micro Commercial Co	Microchip Technology
Voltage - Zener (Nom)	28 V	28 V	28 V
Tolerance	±5%	±5%	±5%
Power - Max	500 mW	500 mW	500 mW
Impedance (Max)	44 Ohms	44 Ohms	44 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 21 V	100 nA @ 21 V	100 nA @ 21 V
Voltage - Forward (Vf) (Max)	1.1 V @ 200 mA	900 mV @ 10 mA	1.1 V @ 200 mA
Operating Temperature Range	-65°C to 175°C	-55°C to 150°C	-65°C to 175°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	DO-213AC, MINI-MELF, SOD-80	SOD-123	DO-213AA
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant

Engineering Selection Recommendations

MMSZ5255B-TP is the primary substitute for the DL5255B-TP. Both parts are manufactured by Micro Commercial Co and maintain identical electrical specifications across all critical parameters. MMSZ5255B-TP is in active production status, ensuring long-term availability and supply chain stability. The part carries ROHS3 compliance matching the original component. The SOD-123 package represents a smaller form factor than the Mini MELF original, requiring PCB layout modification. The operating temperature range is narrower (-55°C to 150°C versus -65°C to 175°C), which may be a limiting factor in applications requiring the full original temperature envelope.

1N5255BUR-1 is a secondary substitute manufactured by Microchip Technology. This part maintains identical electrical specifications and operating temperature range (-65°C to 175°C) as the original DL5255B-TP. The DO-213AA package is mechanically similar to the original Mini MELF package, minimizing PCB layout changes. However, this part is RoHS non-compliant, which may conflict with regulatory requirements in applications subject to RoHS directives. The part is in active production status.

Selection between MMSZ5255B-TP and 1N5255BUR-1 depends on regulatory compliance requirements and thermal operating envelope constraints. Applications requiring full -65°C to 175°C operation and RoHS3 compliance should evaluate package compatibility with MMSZ5255B-TP. Applications where RoHS compliance is not mandated and full temperature range operation is required should consider 1N5255BUR-1.

Frequently Asked Questions (FAQ)

Q: Can MMSZ5255B-TP directly replace DL5255B-TP without circuit modification?

A: MMSZ5255B-TP maintains all electrical specifications of DL5255B-TP. However, the SOD-123 package differs physically from the Mini MELF package, requiring PCB footprint modification. Electrical circuit operation remains unchanged.

Q: What is the impact of the narrower operating temperature range in MMSZ5255B-TP?

A: MMSZ5255B-TP operates from -55°C to 150°C, compared to DL5255B-TP's -65°C to 175°C range. Applications operating below -55°C or above 150°C require 1N5255BUR-1 or continued use of the original part.

Q: Why is 1N5255BUR-1 marked as RoHS non-compliant?

A: RoHS non-compliance indicates the part may contain restricted substances. Applications subject to RoHS directives (EU, California, or equivalent regulations) must use ROHS3-compliant alternatives such as MMSZ5255B-TP.

Q: Are there electrical performance differences between the substitute parts?

A: All three parts maintain identical Zener voltage (28 V), tolerance (±5%), power rating (500 mW), impedance (44 Ohms), and reverse leakage current (100 nA @ 21 V). Forward voltage is specified at different test conditions but represents equivalent performance.

Q: Which substitute is recommended for new designs?

A: MMSZ5255B-TP is recommended for new designs due to active production status, ROHS3 compliance, and manufacturer continuity with the original part source (Micro Commercial Co).

Q: Can package differences affect circuit performance?

A: Package differences (Mini MELF, SOD-123, DO-213AA) do not affect electrical performance. Differences are mechanical and thermal in nature, requiring PCB layout adjustment but not circuit redesign.

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