2M20Z Zener Diode Equivalent & Substitute Parts

Part Overview

The 2M20Z is an active-status through-hole zener diode manufactured by Taiwan Semiconductor Corporation, rated for 20 V nominal zener voltage and 2 W maximum power dissipation in a DO-204AC (DO-15) axial package. This component is used in voltage regulation and protection circuits where precise voltage clamping at 20 V is required. Substitute parts are identified to provide equivalent or enhanced electrical performance while maintaining mechanical and thermal compatibility within the specified operating range of -55°C to 175°C.

Substiute Parts

2M20Z

Taiwan Semiconductor CorporationIn Stock: 7482M20Z Datasheet

Current PartRFQ

1N5357B-TP

Micro Commercial CoIn Stock: 154181N5357B-TP Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 2M20Z is determined by the following critical parameters:

Zener Voltage (Vz): The substitute part must maintain the 20 V nominal zener voltage specification to ensure equivalent voltage regulation performance in the circuit.

Voltage Tolerance: The ±5% tolerance specification must be met to maintain circuit design margins and voltage accuracy.

Package / Case: The substitute must use the DO-204AC or DO-15 axial through-hole package to ensure mechanical compatibility with existing PCB layouts and component placement.

Reverse Leakage Current: The substitute must not exceed 500 nA at 15.2 V to maintain equivalent leakage characteristics.

Operating Temperature Range: The substitute must support operation within the specified temperature envelope to ensure reliability across the full operating range.

Compliance Standards: Both RoHS3 compliance and REACH unaffected status are required for regulatory equivalence.

The 1N5357B-TP meets all critical substitution criteria while providing enhanced power dissipation capability (5 W versus 2 W) and improved impedance characteristics (3 Ohms versus 11 Ohms maximum).

Parameter Comparison

Engineering Selection Recommendations

Both the 2M20Z and 1N5357B-TP are active-status components with full RoHS3 compliance and REACH unaffected designation, meeting current regulatory requirements for electronic component procurement.

The 1N5357B-TP provides functional equivalence with enhanced electrical performance characteristics. The increased maximum power dissipation (5 W versus 2 W) and reduced impedance (3 Ohms versus 11 Ohms maximum) result in lower voltage drop across the zener element and improved thermal performance under load conditions. Both components maintain identical zener voltage (20 V) and tolerance (±5%), ensuring equivalent voltage regulation accuracy.

The operating temperature range of the 1N5357B-TP extends to 150°C, which is 25°C lower than the 2M20Z maximum of 175°C. Circuit designs operating near the upper temperature limit require verification that the 1N5357B-TP temperature specification is compatible with application requirements.

Both components are supplied in DO-15 axial through-hole packages with identical mechanical dimensions, enabling direct physical substitution on existing PCB layouts without modification.

Frequently Asked Questions (FAQ)

Q: Can the 1N5357B-TP directly replace the 2M20Z in existing circuits?

A: The 1N5357B-TP is mechanically and electrically compatible with the 2M20Z for applications operating within the 1N5357B-TP temperature range of -55°C to 150°C. Both components share identical zener voltage (20 V), tolerance (±5%), and DO-15 axial package specifications. The enhanced power rating (5 W) and lower impedance (3 Ohms) of the 1N5357B-TP provide improved performance characteristics.

Q: What is the significance of the impedance difference between these parts?

A: Impedance (Zzt) represents the dynamic resistance of the zener diode at the specified test current. The 1N5357B-TP impedance of 3 Ohms maximum is lower than the 2M20Z impedance of 11 Ohms maximum. Lower impedance results in reduced voltage variation across the zener element when load current changes, improving voltage regulation stability.

Q: Are both parts RoHS compliant?

A: Both the 2M20Z and 1N5357B-TP are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic component use in restricted substance applications.

Q: What is the impact of the power rating difference?

A: The 1N5357B-TP is rated for 5 W maximum power dissipation compared to 2 W for the 2M20Z. Higher power rating allows the component to dissipate greater heat without exceeding maximum junction temperature, providing design margin in applications with variable load conditions or higher current requirements.

Q: Does the package type differ between these components?

A: Both components use the DO-15 axial through-hole package with identical mechanical dimensions. The 2M20Z is supplied in Tape & Reel (TR) packaging, while the 1N5357B-TP is supplied in Cut Tape (CT) packaging. Both packaging formats contain the same component in the same physical package.

Q: What is the reverse leakage current specification?

A: Both components specify 500 nanoamperes maximum reverse leakage current measured at 15.2 V. This parameter defines the maximum current flowing through the zener diode when reverse biased below the zener voltage threshold, affecting circuit standby current and power consumption.

Q: Are there temperature range limitations for substitution?

A: The 1N5357B-TP operating temperature range is -55°C to 150°C, which is 25°C lower than the 2M20Z maximum of 175°C. Applications requiring operation above 150°C junction temperature require the 2M20Z or alternative components rated for higher temperatures.