DL5253B-TP Equivalent & Substitute Parts

Part Overview

The DL5253B-TP is a Zener diode rated at 25 V nominal voltage with 500 mW power dissipation, manufactured by Micro Commercial Co in a Surface Mount Mini MELF package. This component is classified as obsolete, necessitating identification of equivalent substitute parts for ongoing design support and procurement continuity. Equivalent Zener diodes with identical electrical specifications and package compatibility serve as direct functional replacements in voltage regulation and protection circuits.

Key Parameters

Parameter	Value
Voltage - Zener (Nom) (Vz)	25 V
Tolerance	±5%
Power - Max	500 mW
Impedance (Max) (Zzt)	35 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 19 V
Voltage - Forward (Vf) (Max) @ If	1.1 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 (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of Zener diodes is determined by strict equivalence across the following critical parameters:

Zener Voltage (Vz): Must match 25 V nominal specification
Power Rating: Must equal or exceed 500 mW maximum dissipation
Tolerance: Must maintain ±5% voltage tolerance
Package Type: Must be compatible with DO-213AC, MINI-MELF, SOD-80 Surface Mount configuration
Operating Temperature Range: Must support -65°C ~ 175°C operating window
Impedance (Zzt): Must not exceed 35 Ohms maximum
Reverse Leakage Current: Must not exceed 100 nA @ 19 V

Substitute parts are grouped as parametric equivalents when all electrical and mechanical specifications align within these defined tolerances. Forward voltage characteristics may vary between manufacturers while maintaining functional compatibility within the specified operating parameters.

Parameter Comparison

Parameter	DL5253B-TP (Micro Commercial Co)	ZMM5253B-7 (Diodes Incorporated)
Voltage - Zener (Nom) (Vz)	25 V	25 V
Tolerance	±5%	±5%
Power - Max	500 mW	500 mW
Impedance (Max) (Zzt)	35 Ohms	35 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 19 V	100 nA @ 19 V
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 200 mA	1.5 V @ 200 mA
Operating Temperature	-65°C ~ 175°C	-65°C ~ 175°C
Mounting Type	Surface Mount	Surface Mount
Package / Case	DO-213AC, MINI-MELF, SOD-80	DO-213AC, MINI-MELF, SOD-80
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Obsolete

Engineering Selection Recommendations

The ZMM5253B-7 manufactured by Diodes Incorporated is a parametric equivalent to the DL5253B-TP. Both components meet identical electrical specifications for Zener voltage, power dissipation, impedance, and reverse leakage current. Both are ROHS3 compliant with MSL rating of 1 (Unlimited), indicating equivalent environmental and handling requirements.

The forward voltage specification for ZMM5253B-7 is 1.5 V @ 200 mA compared to 1.1 V @ 200 mA for the DL5253B-TP. This difference falls within normal manufacturing variation for Zener diodes and does not affect functional substitution in voltage regulation and protection applications where forward conduction is not the primary operating mode.

Both parts are classified as obsolete. Selection between these equivalents should be based on current inventory availability and procurement lead times. The ZMM5253B-7 carries REACH Affected status, while the DL5253B-TP is REACH Unaffected; this distinction applies only to supply chain and regulatory documentation requirements and does not affect component performance or compatibility.

Frequently Asked Questions (FAQ)

Q: Can the ZMM5253B-7 directly replace the DL5253B-TP in existing designs?

A: Yes. The ZMM5253B-7 meets all critical electrical parameters: 25 V Zener voltage, 500 mW power rating, ±5% tolerance, 35 Ohms maximum impedance, and 100 nA reverse leakage current. Both components use identical Surface Mount Mini MELF packaging (DO-213AC, SOD-80). Pin configuration and footprint compatibility are maintained.

Q: What is the significance of the forward voltage difference between these parts?

A: The DL5253B-TP specifies 1.1 V forward voltage while the ZMM5253B-7 specifies 1.5 V, both measured at 200 mA. In Zener diode applications, forward conduction is not the primary operating mode. The Zener operates in reverse bias for voltage regulation. This forward voltage variation is within normal manufacturing tolerance and does not impact substitution suitability.

Q: Are there compliance or regulatory differences between these parts?

A: Both parts are ROHS3 compliant and carry MSL rating 1 (Unlimited). The ZMM5253B-7 is REACH Affected while the DL5253B-TP is REACH Unaffected. This distinction pertains to supply chain documentation and regulatory reporting only and does not affect electrical performance or component functionality.

Q: What package compatibility should be verified during substitution?

A: Both the DL5253B-TP and ZMM5253B-7 are specified for DO-213AC, MINI-MELF, SOD-80 Surface Mount packages. Verify that the PCB footprint and reflow soldering profile are compatible with Mini MELF package dimensions and thermal requirements. No package conversion is required.

Q: Why are both parts listed as obsolete?

A: Obsolete status indicates these components are no longer in active production by their respective manufacturers. Equivalent substitute parts should be identified for new designs or long-term production support. Current inventory availability should be confirmed with authorized distributors before design commitment.

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