2M18Z Zener Diode Equivalent & Substitute Parts

Part Overview

The 2M18Z is an 18 V, 2 W Zener diode manufactured by Taiwan Semiconductor Corporation, packaged in DO-204AC (DO-15) axial through-hole configuration. This component is classified as Active and maintains full RoHS3 compliance. Substitute parts are identified based on matching electrical specifications and mechanical compatibility within the Zener diode category. Alternative components may be required due to inventory availability, packaging format preferences, or application-specific power rating requirements.

Substiute Parts

2M18Z

Taiwan Semiconductor CorporationIn Stock: 7812M18Z Datasheet

Current PartRFQ

1N5355B-TP

Micro Commercial CoIn Stock: 56661N5355B-TP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 2M18Z is determined by the following critical parameters:

Electrical Compatibility Criteria:

• Zener voltage (Nom): 18 V
• Voltage tolerance: ±5%
• Reverse leakage current: 500 nA @ 13.7 V
• Operating temperature range: -55°C minimum to 150°C minimum

Mechanical Compatibility Criteria:

• Mounting type: Through Hole
• Package / Case: DO-15 or DO-204AC (axial configuration)

Regulatory & Compliance Criteria:

• RoHS3 Compliant
• Moisture Sensitivity Level: 1 (Unlimited)

The 1N5355B-TP meets all electrical and mechanical compatibility requirements. While this substitute features higher maximum power rating (5 W versus 2 W) and lower impedance (2.5 Ohms versus 10 Ohms), these parameters represent enhanced performance characteristics that do not restrict substitution in applications designed for the 2M18Z.

Parameter Comparison

Engineering Selection Recommendations

Both the 2M18Z and 1N5355B-TP are Active products with full RoHS3 compliance and identical Moisture Sensitivity Level ratings. Selection between these components should be based on application requirements and availability:

2M18Z Selection Criteria:

• Applications requiring maximum operating temperature of 175°C
• Designs specified for Tape & Reel packaging format
• Circuits where impedance specification of 10 Ohms is a design requirement

1N5355B-TP Selection Criteria:

• Applications where higher power dissipation capability (5 W) provides design margin
• Circuits tolerant of lower impedance (2.5 Ohms)
• Designs compatible with Cut Tape packaging format
• Applications with maximum operating temperature requirement of 150°C or lower

Both components satisfy the core electrical specifications of 18 V nominal Zener voltage with ±5% tolerance and identical reverse leakage characteristics. The 1N5355B-TP provides enhanced performance headroom through increased power rating and reduced impedance.

Frequently Asked Questions (FAQ)

Q: Can the 1N5355B-TP directly replace the 2M18Z in existing circuit designs?

A: Yes. Both components share identical Zener voltage (18 V), voltage tolerance (±5%), and reverse leakage current specifications (500 nA @ 13.7 V). The through-hole axial package configuration is mechanically compatible. The 1N5355B-TP features higher power rating and lower impedance, which represent performance enhancements rather than limitations.

Q: What is the significance of the different maximum operating temperatures?

A: The 2M18Z operates to 175°C while the 1N5355B-TP operates to 150°C. For applications requiring sustained operation above 150°C, the 2M18Z is the appropriate selection. For applications with maximum operating temperature requirements of 150°C or lower, both components are suitable.

Q: How do the impedance differences affect substitution?

A: The 2M18Z specifies 10 Ohms maximum impedance while the 1N5355B-TP specifies 2.5 Ohms maximum impedance. Lower impedance in the 1N5355B-TP results in improved voltage regulation and reduced dynamic resistance. This represents a performance advantage and does not restrict substitution in applications designed for the 2M18Z.

Q: Are there packaging format considerations for substitution?

A: The 2M18Z is supplied in Tape & Reel (TR) format while the 1N5355B-TP is supplied in Cut Tape (CT) format. Both are through-hole axial packages compatible with standard PCB assembly processes. Packaging format selection depends on production volume and assembly equipment compatibility rather than electrical performance.

Q: Do both components meet the same regulatory compliance standards?

A: Yes. Both the 2M18Z and 1N5355B-TP are RoHS3 compliant, REACH unaffected, and classified as Moisture Sensitivity Level 1 (Unlimited). Both components carry identical regulatory classification under ECCN EAR99 and HTSUS 8541.10.0050.