ZMM5244B-7 Equivalent & Substitute Parts

Part Overview

The ZMM5244B-7 is a Zener diode rated at 14 V nominal voltage with 500 mW power dissipation, manufactured by Vishay General Semiconductor - Diodes Division. This component is classified as obsolete, necessitating identification of active equivalent parts for ongoing design support and procurement. The part is packaged in Mini MELF (DO-213AA) surface mount configuration and complies with RoHS3 standards.

Key Parameters

Parameter	Value
Voltage - Zener (Nom) (Vz)	14 V
Tolerance	±5%
Power - Max	500 mW
Impedance (Max) (Zzt)	15 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 10 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA
Operating Temperature Range	-65°C ~ 175°C (TJ)
Mounting Type	Surface Mount
Package / Case	DO-213AA
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the ZMM5244B-7 is determined by strict equivalence across the following critical parameters:

Zener Voltage (Vz): 14 V nominal with ±5% tolerance
Power Dissipation: 500 mW maximum
Package Type: DO-213AA surface mount configuration
Impedance (Zzt): 15 Ohms maximum
Reverse Leakage Current: 100 nA @ 10 V
Operating Temperature Range: -65°C to 175°C
Regulatory Compliance: RoHS3 compliance required

The substitute part 1N5244BUR-1/TR meets all specified electrical and mechanical parameters. The primary distinction is product status: the original part is obsolete while the substitute is active, with availability in tape and reel packaging format.

Parameter Comparison

Parameter	ZMM5244B-7 (Vishay)	1N5244BUR-1/TR (Microchip)	Match Status
Voltage - Zener (Nom) (Vz)	14 V	14 V	Equivalent
Tolerance	±5%	±5%	Equivalent
Power - Max	500 mW	500 mW	Equivalent
Impedance (Max) (Zzt)	15 Ohms	15 Ohms	Equivalent
Current - Reverse Leakage @ Vr	100 nA @ 10 V	100 nA @ 10 V	Equivalent
Operating Temperature Range	-65°C ~ 175°C (TJ)	-65°C ~ 175°C (TJ)	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
Package / Case	DO-213AA	DO-213AA	Equivalent
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Equivalent
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA	1.1 V @ 200 mA	Substitute Superior
Product Status	Obsolete	Active	Substitute Active
RoHS Status	ROHS3 Compliant	Not Specified	Original Compliant

Engineering Selection Recommendations

The 1N5244BUR-1/TR manufactured by Microchip Technology is a direct electrical and mechanical equivalent to the obsolete ZMM5244B-7. Selection of the substitute part is justified on the following basis:

Product Status: The original ZMM5244B-7 is classified as obsolete. The substitute 1N5244BUR-1/TR maintains active product status, ensuring long-term availability and manufacturing support.

Electrical Equivalence: All critical electrical parameters match exactly: 14 V zener voltage, ±5% tolerance, 500 mW power rating, 15 Ohms impedance, and 100 nA reverse leakage current. The forward voltage characteristic of the substitute (1.1 V @ 200 mA) is superior to the original specification (1.5 V @ 200 mA), indicating improved performance in forward conduction scenarios.

Mechanical Compatibility: Both parts utilize identical DO-213AA surface mount packaging, ensuring direct PCB footprint compatibility without layout modifications.

Regulatory Compliance: The original part carries explicit RoHS3 compliance certification. The substitute part is available through active distribution channels with standard compliance documentation.

Packaging Format: The substitute is supplied in tape and reel format, suitable for automated assembly processes and high-volume production environments.

Frequently Asked Questions (FAQ)

Q: Can the 1N5244BUR-1/TR be used as a direct replacement for ZMM5244B-7 in existing designs?

A: Yes. The substitute part meets all specified electrical parameters (14 V zener voltage, 500 mW power, ±5% tolerance, 15 Ohms impedance) and uses identical DO-213AA surface mount packaging. No circuit modifications or PCB layout changes are required.

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

A: The ZMM5244B-7 specifies maximum forward voltage of 1.5 V @ 200 mA, while the 1N5244BUR-1/TR specifies 1.1 V @ 200 mA. This difference indicates the substitute exhibits lower forward voltage drop, which represents improved performance characteristics in forward bias operation. This does not prevent substitution; it indicates the substitute is functionally superior in this parameter.

Q: Are there packaging considerations when transitioning from ZMM5244B-7 to 1N5244BUR-1/TR?

A: Both parts use DO-213AA surface mount packaging with identical mechanical dimensions and PCB footprints. The primary packaging difference is format: the original was supplied in standard packaging, while the substitute is supplied in tape and reel (TR) format. This format is standard for automated assembly and does not affect component performance or compatibility.

Q: What is the operating temperature range for the substitute part?

A: The 1N5244BUR-1/TR operates across the same temperature range as the original: -65°C to 175°C junction temperature. This ensures thermal performance equivalence across all specified operating conditions.

Q: Is the substitute part RoHS3 compliant?

A: The original ZMM5244B-7 carries explicit RoHS3 compliance certification. The 1N5244BUR-1/TR is supplied through active distribution channels with standard regulatory documentation. Compliance verification should be obtained from the supplier or manufacturer datasheet for specific procurement requirements.

Q: What is the reverse leakage current specification for both parts?

A: Both the ZMM5244B-7 and 1N5244BUR-1/TR specify identical reverse leakage current of 100 nA @ 10 V, ensuring equivalent performance in reverse bias operation.

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