Equivalent & Substitute Parts for ZMM5256B-7

Part Overview

The Vishay General Semiconductor - Diodes Division ZMM5256B-7 is a surface-mount Zener diode rated at 30 V nominal Zener voltage and 500 mW maximum power dissipation, provided in the Mini MELF (DO-213AA) package. This component is classified as obsolete, prompting the need for suitable substitute parts that satisfy identical electrical, mechanical, and compliance parameters for continued design-in or replacement in existing assemblies.

Key Parameters

Parameter	ZMM5256B-7
Category	Diodes, Zener
Voltage - Zener (Nom) (Vz)	30 V
Tolerance	±5%
Power - Max	500 mW
Impedance (Max) (Zzt)	49 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 23 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA
Operating Temperature	-65°C ~ 175°C (TJ)
Mounting Type	Surface Mount
Package / Case	DO-213AA (Mini MELF)
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute part selection is strictly based on equivalency in the following parameters: Zener diode device category, nominal Zener voltage (30 V), tolerance (±5%), maximum power dissipation (500 mW), maximum Zener impedance (49 Ohms), maximum reverse leakage current (100 nA @ 23 V), maximum forward voltage (Vf) at specified forward current, identical operating temperature range, mounting type (surface mount), and compliance with the DO-213AA package (Mini MELF). Only substitute parts matching all these parameters are included.

Parameter Comparison

Parameter	ZMM5256B-7 (Vishay General Semiconductor - Diodes Division)	1N5256BUR-1/TR (Microchip Technology)
Category	Diodes, Zener	Diodes, Zener
Voltage - Zener (Nom) (Vz)	30 V	30 V
Tolerance	±5%	±5%
Power - Max	500 mW	500 mW
Impedance (Max) (Zzt)	49 Ohms	49 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 23 V	100 nA @ 23 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA	1.1 V @ 200 mA
Operating Temperature	-65°C ~ 175°C (TJ)	-65°C ~ 175°C (TJ)
Mounting Type	Surface Mount	Surface Mount
Package / Case	DO-213AA (Mini MELF)	DO-213AA
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

The ZMM5256B-7 is classified as obsolete. For applications requiring sustained supply chain reliability and compliance with RoHS3 and MSL 1 (Unlimited) requirements, the 1N5256BUR-1/TR is a suitable substitute due to equivalency across all specified parameters and retention of the DO-213AA package. The 1N5256BUR-1/TR is listed as active and satisfies all compliance classifications provided.

Frequently Asked Questions (FAQ)

Q1: What are the substitution criteria used for ZMM5256B-7?
A1: Substitution is based solely on matching the following parameters: Zener voltage (30 V), tolerance (±5%), maximum power dissipation (500 mW), Zener impedance (49 Ohms), maximum reverse leakage current (100 nA @ 23 V), maximum forward voltage (Vf) at specified current, package (DO-213AA/Mini MELF), mounting type, and operational temperature range.

Q2: Are the ZMM5256B-7 and 1N5256BUR-1/TR form-factor identical?
A2: Both parts are supplied in the DO-213AA (Mini MELF) surface-mount package.

Q3: Is there any difference in forward voltage specification between the original and substituted part?
A3: The ZMM5256B-7 specifies a maximum forward voltage of 1.5 V @ 200 mA, while the 1N5256BUR-1/TR specifies 1.1 V @ 200 mA.

Q4: Are both parts compliant with moisture sensitivity and environmental standards?
A4: Both parts are rated MSL 1 (Unlimited), with RoHS3 compliance status provided for ZMM5256B-7.

Q5: Why is finding a substitute necessary for ZMM5256B-7?
A5: The ZMM5256B-7 is listed as obsolete, requiring substitution in applications that demand ongoing availability and compliance.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message