ZMM5221B-13 Equivalent & Substitute Parts

Part Overview

The ZMM5221B-13 is a Zener diode rated at 2.4 V nominal with 500 mW power dissipation capability, designed for voltage regulation and protection applications in surface mount configurations. Manufactured by Vishay General Semiconductor - Diodes Division, this component is classified as obsolete. Due to its obsolete status, identifying equivalent substitute parts with matching electrical and mechanical specifications is necessary to maintain design continuity and ensure component availability for production and repair applications.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	2.4	V
Tolerance	±5	%
Power - Max	500	mW
Impedance (Max)	30	Ohms
Current - Reverse Leakage @ Vr	100	µA @ 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

Substitute parts for the ZMM5221B-13 are identified based on strict electrical and mechanical parameter matching. The critical parameters that determine substitution eligibility are:

Zener Voltage (Vz): 2.4 V nominal with ±5% tolerance
Power Dissipation: 500 mW maximum
Impedance (Zzt): 30 Ohms maximum
Reverse Leakage Current: 100 µA @ 1 V
Operating Temperature Range: -65°C to 175°C (TJ)
Package Type: DO-213AA (Mini MELF surface mount)
Mounting Configuration: Surface mount
Compliance: ROHS3 compliant, MSL Level 1

The substitute part 1N5221BUR-1/TR from Microchip Technology meets all specified electrical parameters and mechanical requirements, enabling direct functional replacement in applications requiring 2.4 V Zener regulation at 500 mW power levels.

Parameter Comparison

Parameter	ZMM5221B-13 (Vishay)	1N5221BUR-1/TR (Microchip)	Match Status
Voltage - Zener (Nom)	2.4 V	2.4 V	Identical
Tolerance	±5%	±5%	Identical
Power - Max	500 mW	500 mW	Identical
Impedance (Max)	30 Ohms	30 Ohms	Identical
Current - Reverse Leakage @ Vr	100 µA @ 1 V	100 µA @ 1 V	Identical
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 (TJ)	-65°C to 175°C (TJ)	Identical
Mounting Type	Surface Mount	Surface Mount	Identical
Package / Case	DO-213AA	DO-213AA	Identical
RoHS Status	ROHS3 Compliant	Not specified in data	Main part compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Identical
Product Status	Obsolete	Active	Substitute Active

Engineering Selection Recommendations

The 1N5221BUR-1/TR from Microchip Technology is a direct functional equivalent to the obsolete ZMM5221B-13. Selection of this substitute part is based on the following engineering criteria:

Electrical Equivalence: All critical electrical parameters match the original specification, including nominal Zener voltage, tolerance band, maximum power dissipation, impedance, reverse leakage current, and operating temperature range.

Mechanical Compatibility: Both parts utilize the DO-213AA package in surface mount configuration, ensuring PCB layout and assembly process compatibility without design modification.

Product Status: The substitute part maintains active product status with Microchip Technology, providing long-term availability and supply chain stability compared to the obsolete original part.

Compliance and Certification: The original part carries ROHS3 compliance and MSL Level 1 rating. The substitute part maintains equivalent moisture sensitivity classification, supporting standard handling and storage procedures.

Performance Enhancement: The substitute part exhibits superior forward voltage characteristics (1.1 V versus 1.5 V at 200 mA), resulting in reduced power dissipation during forward conduction operation.

Frequently Asked Questions (FAQ)

Q: Can the 1N5221BUR-1/TR replace the ZMM5221B-13 in existing designs?

A: Yes. The 1N5221BUR-1/TR meets all electrical and mechanical specifications of the ZMM5221B-13. Both components share identical Zener voltage (2.4 V), power rating (500 mW), impedance (30 Ohms), operating temperature range (-65°C to 175°C), and DO-213AA package configuration. No circuit design modifications are required.

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

A: The ZMM5221B-13 specifies maximum forward voltage of 1.5 V at 200 mA, while the 1N5221BUR-1/TR specifies 1.1 V at the same current. This difference results in lower power dissipation in the substitute part during forward conduction, representing an operational improvement.

Q: Are the packaging formats identical?

A: Yes. Both parts use the DO-213AA package in Mini MELF surface mount configuration. The 1N5221BUR-1/TR is supplied in Tape & Reel (TR) format, which is standard for surface mount production environments.

Q: What is the product availability status?

A: The ZMM5221B-13 is classified as obsolete. The 1N5221BUR-1/TR maintains active product status with Microchip Technology, ensuring continued availability and supply chain support.

Q: Are moisture sensitivity levels compatible?

A: Yes. Both parts carry MSL Level 1 (Unlimited) classification, indicating identical moisture sensitivity handling requirements and storage conditions.

Q: Can these parts be used interchangeably in production?

A: Yes. The electrical and mechanical equivalence, combined with identical package specifications and operating parameters, permits direct substitution in manufacturing processes without process or design changes.

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