ZMM5256B-13 Equivalent & Substitute Parts

Part Overview

The ZMM5256B-13 is a Zener diode rated at 30 V nominal voltage with 500 mW power dissipation capability, manufactured by Vishay General Semiconductor - Diodes Division. This component is packaged in the Surface Mount Mini MELF (DO-213AA) format and is designed for voltage regulation and protection applications in electronic circuits.

The ZMM5256B-13 carries an Obsolete product status. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this component.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	30	V
Tolerance	±5	%
Power - Max	500	mW
Impedance (Max)	49	Ohms
Current - Reverse Leakage @ Vr	100	nA @ 23 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 ZMM5256B-13 is determined by strict equivalence across the following critical electrical and mechanical parameters:

Electrical Parameters:

Zener voltage (Vz): 30 V nominal
Tolerance: ±5%
Maximum power dissipation: 500 mW
Maximum impedance (Zzt): 49 Ohms
Reverse leakage current: 100 nA @ 23 V
Operating temperature range: -65°C to 175°C

Mechanical Parameters:

Package type: DO-213AA (Surface Mount Mini MELF)
Mounting configuration: Surface Mount

Substitute parts must match all specified electrical parameters and the DO-213AA package format to ensure functional and physical compatibility within the original application circuit.

Parameter Comparison

Parameter	ZMM5256B-13 (Vishay)	1N5256BUR-1/TR (Microchip)	Match Status
Voltage - Zener (Nom)	30 V	30 V	Equivalent
Tolerance	±5%	±5%	Equivalent
Power - Max	500 mW	500 mW	Equivalent
Impedance (Max)	49 Ohms	49 Ohms	Equivalent
Current - Reverse Leakage @ Vr	100 nA @ 23 V	100 nA @ 23 V	Equivalent
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA	1.1 V @ 200 mA	Compatible (Lower Vf)
Operating Temperature Range	-65°C to 175°C	-65°C to 175°C	Equivalent
Package / Case	DO-213AA	DO-213AA	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
RoHS Status	ROHS3 Compliant	Not specified	Main part compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Equivalent

Engineering Selection Recommendations

The 1N5256BUR-1/TR manufactured by Microchip Technology is a parametric equivalent to the ZMM5256B-13. Both components share identical electrical specifications for zener voltage, tolerance, power rating, impedance, reverse leakage current, and operating temperature range. Both are packaged in the DO-213AA Surface Mount format with identical moisture sensitivity classification.

The primary distinction between these components is product status: the ZMM5256B-13 is Obsolete, while the 1N5256BUR-1/TR maintains Active status. The 1N5256BUR-1/TR is supplied in Tape & Reel (TR) packaging format, which is standard for high-volume production environments.

The forward voltage (Vf) of the 1N5256BUR-1/TR is specified at 1.1 V @ 200 mA, compared to 1.5 V @ 200 mA for the ZMM5256B-13. This lower forward voltage represents an improvement in performance characteristics and does not introduce incompatibility with the original application.

For new designs or production continuity, the 1N5256BUR-1/TR is the appropriate selection due to its Active product status and continued availability.

Frequently Asked Questions (FAQ)

Q: Can the 1N5256BUR-1/TR be used as a direct replacement for the ZMM5256B-13?

A: Yes. Both components meet identical electrical specifications for zener voltage (30 V), tolerance (±5%), power dissipation (500 mW), impedance (49 Ohms), reverse leakage current (100 nA @ 23 V), and operating temperature range (-65°C to 175°C). Both are packaged in DO-213AA Surface Mount format. The components are functionally interchangeable.

Q: What is the significance of the lower forward voltage in the 1N5256BUR-1/TR?

A: The 1N5256BUR-1/TR specifies a forward voltage of 1.1 V @ 200 mA, compared to 1.5 V @ 200 mA for the ZMM5256B-13. This represents improved performance characteristics and does not create incompatibility. The lower forward voltage may result in reduced power dissipation in forward-biased conditions.

Q: Are there packaging differences between these components?

A: Both components use the DO-213AA Surface Mount package format. The primary packaging difference is that the 1N5256BUR-1/TR is supplied in Tape & Reel (TR) format, which is standard for automated assembly and high-volume production. The ZMM5256B-13 packaging format is not specified in the available data.

Q: Why is the ZMM5256B-13 marked as Obsolete?

A: The ZMM5256B-13 carries an Obsolete product status, indicating that the manufacturer has discontinued active production and support. The 1N5256BUR-1/TR, with Active status, represents the current production equivalent and is the recommended selection for ongoing applications.

Q: Are both components RoHS compliant?

A: The ZMM5256B-13 is ROHS3 Compliant. RoHS compliance status for the 1N5256BUR-1/TR is not specified in the available technical data. Verification of RoHS compliance for the 1N5256BUR-1/TR should be obtained from the manufacturer if this certification is required for your application.

Q: What is the moisture sensitivity classification for these components?

A: Both components are classified as Moisture Sensitivity Level 1 (Unlimited), indicating minimal moisture sensitivity and no special handling requirements during storage or assembly.

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