ZMM5253B-7 Equivalent & Substitute Parts

Part Overview

The ZMM5253B-7 is a Zener diode rated at 25 V nominal voltage with 500 mW power dissipation, manufactured by Diodes Incorporated in a Mini MELF surface mount package. This component is classified as obsolete, necessitating identification of equivalent and substitute parts for ongoing design support and procurement continuity. The part maintains ROHS3 compliance and operates across an extended temperature range of -65°C to 175°C.

Key Parameters

Parameter	Value
Voltage - Zener (Nom)	25 V
Tolerance	±5%
Power - Max	500 mW
Impedance (Max)	35 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 19 V
Voltage - Forward (Vf) (Max) @ If	1.5 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	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the ZMM5253B-7 is determined by the following critical parameters: nominal Zener voltage (25 V), maximum power dissipation (500 mW), voltage tolerance (±5%), impedance specification (35 Ohms maximum), reverse leakage current (100 nA @ 19 V), and operating temperature range (-65°C to 175°C). All substitute parts must maintain these electrical characteristics and surface mount configuration.

Substitute parts are grouped into two categories:

Parametric Equivalents: Parts with identical electrical specifications and Mini MELF packaging, differing only in manufacturer or product status.

Manufacturer Recommended Alternatives: Parts with equivalent electrical performance but different package configurations (DO-213AA or DO-213AB) or tolerance grades, offered by active manufacturers to replace the obsolete ZMM5253B-7.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Ir @ Vr	Vf (Max) @ If	Temp Range	Package	Product Status
ZMM5253B-7	Diodes Incorporated	25 V	±5%	500 mW	35 Ω	100 nA @ 19 V	1.5 V @ 200 mA	-65°C ~ 175°C	DO-213AC, MINI-MELF	Obsolete
DL5253B-TP	Micro Commercial Co	25 V	±5%	500 mW	35 Ω	100 nA @ 19 V	1.1 V @ 200 mA	-65°C ~ 175°C	DO-213AC, MINI-MELF	Obsolete
1N5253BUR-1	Microchip Technology	25 V	±5%	500 mW	35 Ω	100 nA @ 19 V	1.1 V @ 200 mA	-65°C ~ 175°C (TJ)	DO-213AA	Active
CDLL5253B	Microchip Technology	25 V	±5%	Not specified	35 Ω	100 nA @ 19 V	1.1 V @ 200 mA	-65°C ~ 175°C	DO-213AB, MELF	Active
CDLL5253A	Microchip Technology	25 V	±10%	Not specified	35 Ω	100 nA @ 19 V	1.1 V @ 200 mA	-65°C ~ 175°C	DO-213AB, MELF	Active
CDLL5253	Microchip Technology	25 V	±20%	Not specified	35 Ω	100 nA @ 19 V	1.1 V @ 200 mA	-65°C ~ 175°C	DO-213AB, MELF	Active

Engineering Selection Recommendations

Direct Replacement (Parametric Equivalent): The DL5253B-TP from Micro Commercial Co provides identical electrical specifications and Mini MELF packaging to the ZMM5253B-7. Both parts are classified as obsolete; however, the DL5253B-TP maintains ROHS3 compliance and offers equivalent performance characteristics.

Active Manufacturer Alternatives: For designs requiring components from active manufacturers, the 1N5253BUR-1 from Microchip Technology is the primary recommendation. This part maintains all critical electrical parameters (25 V nominal, ±5% tolerance, 500 mW power, 35 Ω impedance, 100 nA reverse leakage) and operates across the identical temperature range. The package transitions from Mini MELF (DO-213AC) to DO-213AA, requiring PCB layout verification for mechanical compatibility.

The CDLL5253B from Microchip Technology offers ±5% tolerance matching with active product status and DO-213AB packaging. This part is suitable for applications where package footprint adjustment is feasible.

The CDLL5253A and CDLL5253 variants provide relaxed tolerance specifications (±10% and ±20% respectively) and are appropriate only for applications where voltage tolerance requirements permit deviation from the original ±5% specification.

Frequently Asked Questions (FAQ)

Q: Can the DL5253B-TP directly replace the ZMM5253B-7 without PCB modification?

A: Yes. The DL5253B-TP maintains identical electrical specifications and Mini MELF packaging (DO-213AC). No PCB layout changes are required for mechanical or electrical compatibility.

Q: What is the primary difference between the 1N5253BUR-1 and the ZMM5253B-7?

A: The 1N5253BUR-1 differs in package configuration (DO-213AA versus DO-213AC Mini MELF) and forward voltage specification (1.1 V versus 1.5 V @ 200 mA). All other electrical parameters remain equivalent. PCB footprint adjustment is necessary for package transition.

Q: Why do the CDLL5253 variants show different tolerance grades?

A: The CDLL5253 series offers three tolerance options: CDLL5253B (±5%), CDLL5253A (±10%), and CDLL5253 (±20%). Selection depends on circuit requirements for voltage regulation accuracy. The ZMM5253B-7 specifies ±5% tolerance; therefore, CDLL5253B is the appropriate selection if tolerance matching is required.

Q: Are all substitute parts RoHS compliant?

A: The ZMM5253B-7 and DL5253B-TP are ROHS3 compliant. The Microchip Technology parts (1N5253BUR-1, CDLL5253B, CDLL5253A, CDLL5253) are classified as RoHS non-compliant. Compliance requirements must be verified against design specifications and regulatory obligations.

Q: What is the impact of forward voltage differences between substitute parts?

A: The ZMM5253B-7 specifies 1.5 V maximum forward voltage at 200 mA, while substitute parts specify 1.1 V. This difference affects forward conduction characteristics but does not impact Zener regulation performance in typical voltage regulation circuits. Circuit analysis is required for applications sensitive to forward voltage characteristics.

Q: Can CDLL5253A or CDLL5253 be used if the original design specifies ±5% tolerance?

A: CDLL5253A (±10%) and CDLL5253 (±20%) exhibit wider tolerance bands than the original specification. These parts are suitable only for applications where relaxed voltage tolerance is acceptable. Circuit performance verification is necessary to confirm compatibility with relaxed tolerance specifications.

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