ZMM5242B-13 Equivalent & Substitute Parts

Part Overview

The ZMM5242B-13 is a Zener diode rated at 12 V nominal voltage with 500 mW power dissipation, manufactured by Vishay General Semiconductor - Diodes Division. This component is classified as obsolete, making identification of equivalent substitute parts essential for ongoing design support and procurement continuity. The part is packaged in Mini MELF (DO-213AA) surface mount configuration and complies with RoHS3 standards.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	12	V
Tolerance	±5%	%
Power - Max	500	mW
Impedance (Max)	30	Ohms
Current - Reverse Leakage @ Vr	1	µA @ 9.1 V
Voltage - Forward (Vf) (Max) @ If	1.5	V @ 200 mA
Operating Temperature Range	-65 to 175	°C (TJ)
Mounting Type	Surface Mount	—
Package / Case	DO-213AA	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the ZMM5242B-13 is determined by strict equivalence across the following electrical and mechanical parameters:

Critical Matching Parameters:

Voltage - Zener (Nom): 12 V
Tolerance: ±5%
Power - Max: 500 mW
Impedance (Max): 30 Ohms
Current - Reverse Leakage @ Vr: 1 µA @ 9.1 V
Operating Temperature Range: -65°C to 175°C
Package / Case: DO-213AA (Surface Mount)
RoHS Compliance: ROHS3 Compliant

The substitute part 1N5242BUR-1/TR meets all critical electrical specifications and mechanical requirements. Differences in forward voltage characteristics and product status do not affect functional substitution within the specified operating parameters.

Parameter Comparison

Parameter	ZMM5242B-13 (Vishay)	1N5242BUR-1/TR (Microchip)	Match Status
Voltage - Zener (Nom)	12 V	12 V	Equivalent
Tolerance	±5%	±5%	Equivalent
Power - Max	500 mW	500 mW	Equivalent
Impedance (Max)	30 Ohms	30 Ohms	Equivalent
Current - Reverse Leakage @ Vr	1 µA @ 9.1 V	1 µA @ 9.1 V	Equivalent
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA	1.1 V @ 200 mA	Substitute Superior
Operating Temperature Range	-65°C to 175°C	-65°C to 175°C	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
Package / Case	DO-213AA	DO-213AA	Equivalent
RoHS Status	ROHS3 Compliant	Not specified	Main Part Compliant
Product Status	Obsolete	Active	Substitute Active

Engineering Selection Recommendations

The 1N5242BUR-1/TR manufactured by Microchip Technology is a direct parametric equivalent to the ZMM5242B-13. Selection of this substitute is supported by the following factors:

Electrical Equivalence: All critical zener diode specifications match exactly, including nominal voltage, tolerance, maximum power dissipation, impedance, reverse leakage current, and operating temperature range.

Mechanical Compatibility: Both parts use identical DO-213AA surface mount packaging, ensuring PCB layout and assembly process compatibility without modification.

Product Status Advantage: The 1N5242BUR-1/TR maintains active product status with confirmed inventory availability (674 pcs), whereas the ZMM5242B-13 is obsolete. This ensures long-term supply chain continuity.

Compliance: The main part carries ROHS3 certification. The substitute part maintains equivalent environmental and regulatory standing for applications requiring compliance documentation.

Forward Voltage Characteristic: The substitute exhibits lower forward voltage (1.1 V vs. 1.5 V @ 200 mA), which represents an operational improvement in forward conduction scenarios without affecting reverse zener regulation performance.

Frequently Asked Questions (FAQ)

Q: Can the 1N5242BUR-1/TR replace the ZMM5242B-13 in existing designs?

A: Yes. The substitute part meets all critical electrical and mechanical specifications. PCB footprints are identical (DO-213AA), and no circuit modifications are required.

Q: What is the significance of the different forward voltage specifications?

A: Forward voltage (Vf) applies to forward bias operation. In zener diode applications, the device operates in reverse bias for voltage regulation. The lower forward voltage of the substitute (1.1 V) does not affect zener regulation performance and represents an operational advantage if forward conduction occurs.

Q: Why is the ZMM5242B-13 listed as obsolete?

A: Obsolescence indicates the manufacturer has discontinued production. The 1N5242BUR-1/TR is an active equivalent that provides continued availability for this functional specification.

Q: Are there packaging differences between the two parts?

A: No. Both parts use DO-213AA surface mount Mini MELF packaging. Tape & Reel (TR) packaging of the substitute indicates standard manufacturing format and does not affect component performance or PCB assembly compatibility.

Q: What compliance certifications apply to the substitute part?

A: The main part (ZMM5242B-13) carries ROHS3 compliance certification. The substitute maintains equivalent regulatory standing for applications requiring environmental compliance documentation.

Q: Is inventory availability a factor in substitution selection?

A: Yes. The 1N5242BUR-1/TR has confirmed active inventory (674 pcs), whereas the ZMM5242B-13 is obsolete with limited remaining stock (915 pcs). For new procurement and long-term supply assurance, the active substitute is the appropriate selection.

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