2M18ZH Zener Diode Equivalent & Substitute Parts

Part Overview

The 2M18ZH is an 18 V, 2 W Zener diode manufactured by Taiwan Semiconductor Corporation, designed for voltage regulation and protection applications in through-hole configurations. This component is classified as Active product status with AEC-Q101 automotive qualification. Substitute parts are identified when equivalent electrical performance parameters are met within the specified tolerance ranges, allowing for component interchangeability in circuit designs where the primary part becomes unavailable or when alternative packaging or inventory conditions necessitate alternative sourcing.

Substiute Parts

2M18ZH

Taiwan Semiconductor CorporationIn Stock: 9952M18ZH Datasheet

Current PartRFQ

1N5355B-TP

Micro Commercial CoIn Stock: 56661N5355B-TP Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 2M18ZH is determined by alignment of the following critical electrical parameters: nominal Zener voltage of 18 V, voltage tolerance of ±5%, reverse leakage current of 500 nA at 13.7 V, and through-hole axial mounting configuration in DO-15 package format. The 1N5355B-TP meets these core electrical specifications and maintains mechanical compatibility through identical package designation. Substitution is valid when the substitute part maintains or exceeds the specified electrical performance within the defined tolerance band and operates within the required temperature range for the application.

Parameter Comparison

Engineering Selection Recommendations

The 1N5355B-TP is electrically compatible with the 2M18ZH for applications requiring 18 V Zener regulation at nominal power levels up to 2 W. Both components maintain ROHS3 compliance and EAR99 export classification. The substitute part provides superior power dissipation capability (5 W versus 2 W) and lower impedance (2.5 Ohms versus 10 Ohms), making it suitable for circuits where the 2M18ZH is unavailable. The operating temperature range of the 1N5355B-TP extends to 150°C maximum, which is 25°C lower than the 2M18ZH specification of 175°C. Selection of the 1N5355B-TP is appropriate for applications operating within the -55°C to 150°C range. Packaging format differs between the main part (Tape & Reel) and substitute (Cut Tape), requiring consideration of procurement and assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the 1N5355B-TP directly replace the 2M18ZH in all applications?

A: The 1N5355B-TP is electrically compatible for applications operating within -55°C to 150°C. Applications requiring operation above 150°C require the 2M18ZH. Both components share identical Zener voltage (18 V), tolerance (±5%), and reverse leakage specifications (500 nA @ 13.7 V).

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

A: The 2M18ZH is rated at 2 W maximum power dissipation, while the 1N5355B-TP is rated at 5 W. The substitute part can handle higher power dissipation without thermal stress. For circuits designed around the 2 W specification, the 5 W substitute operates within acceptable margins.

Q: Are the package designations identical?

A: Both components use DO-204AC and DO-15 axial through-hole packages, ensuring mechanical and pin compatibility. The packaging format differs: 2M18ZH is supplied in Tape & Reel format, while 1N5355B-TP is supplied in Cut Tape format.

Q: Do both parts meet automotive qualification requirements?

A: The 2M18ZH carries AEC-Q101 automotive qualification. The 1N5355B-TP specifications provided do not indicate automotive qualification status. Automotive applications requiring AEC-Q101 certification should verify qualification status with the manufacturer before substitution.

Q: What is the impedance difference and does it affect circuit performance?

A: The 2M18ZH has maximum impedance of 10 Ohms, while the 1N5355B-TP has maximum impedance of 2.5 Ohms. Lower impedance in the substitute part results in improved voltage regulation characteristics and faster transient response in protection circuits.

Q: Are there compliance or regulatory differences between these parts?

A: Both components are ROHS3 compliant, REACH unaffected, and classified as EAR99 for export purposes. Both carry identical HTSUS classification (8541.10.0050). Moisture sensitivity level is 1 (Unlimited) for both parts.