2M19Z Zener Diode Equivalent & Substitute Parts

Part Overview

The 2M19Z is an active-status Zener diode manufactured by Taiwan Semiconductor Corporation, rated for 19 V nominal Zener voltage and 2 W maximum power dissipation. This component is packaged in DO-204AC (DO-15) axial through-hole configuration and is RoHS3 compliant. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, design flexibility, or application-specific requirements within the allowed parameter ranges for this diode category.

Substiute Parts

2M19Z

Taiwan Semiconductor CorporationIn Stock: 10632M19Z Datasheet

Current PartRFQ

1N5355B-TP

Micro Commercial CoIn Stock: 56661N5355B-TP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 2M19Z with alternative Zener diodes is determined by the following electrical and mechanical criteria:

Electrical Compatibility Parameters:

• Zener voltage (Vz) nominal rating within ±5% tolerance band
• Power dissipation capability (Pmax) equal to or greater than the original specification
• Impedance (Zzt) characteristics suitable for the application circuit
• Reverse leakage current specifications at rated reverse voltage
• Operating temperature range that encompasses or exceeds the original range

Mechanical Compatibility Parameters:

• Through-hole axial package configuration (DO-15 / DO-204AC)
• Lead spacing and physical dimensions compatible with existing PCB layouts

Compliance Parameters:

• RoHS3 compliance status
• REACH unaffected classification
• Identical ECCN and HTSUS codes

The 1N5355B-TP is identified as a substitute based on shared package type, compliance certifications, and overlapping electrical performance within acceptable parameter ranges for Zener diode applications.

Parameter Comparison

Engineering Selection Recommendations

2M19Z Selection Criteria:

• Applications requiring 19 V nominal Zener voltage with ±5% tolerance
• Circuits operating within -55°C to 175°C temperature range
• 2 W maximum power dissipation requirement
• Higher impedance characteristic (11 Ohms maximum) suitable for specific circuit designs
• Taiwan Semiconductor Corporation sourcing preference

1N5355B-TP Selection Criteria:

• Applications tolerating 18 V nominal Zener voltage (1 V lower than 2M19Z)
• Circuits with maximum operating temperature requirement of 150°C or lower
• Applications benefiting from higher power dissipation capability (5 W)
• Lower impedance characteristic (2.5 Ohms) for improved voltage regulation
• Micro Commercial Co sourcing availability
• Cut tape packaging format preference

Both parts maintain identical RoHS3 compliance, REACH unaffected status, and export classification codes. Selection between these parts depends on circuit voltage tolerance, temperature operating range, and impedance requirements specific to the application.

Frequently Asked Questions (FAQ)

Q: Can the 1N5355B-TP directly replace the 2M19Z in all applications?

A: Direct substitution depends on circuit tolerance for a 1 V lower Zener voltage (18 V vs. 19 V) and maximum operating temperature of 150°C instead of 175°C. The 1N5355B-TP has lower impedance (2.5 Ohms vs. 11 Ohms), which affects voltage regulation characteristics. Circuit validation is required for specific applications.

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

A: Impedance (Zzt) affects the dynamic resistance of the Zener diode. The 2M19Z has 11 Ohms maximum impedance, while the 1N5355B-TP has 2.5 Ohms. Lower impedance provides better voltage regulation under load changes but may affect circuit behavior depending on the application design.

Q: Are both parts physically compatible with the same PCB layout?

A: Both parts use DO-15 (DO-204AC) axial through-hole packaging. Physical dimensions and lead spacing are compatible for standard PCB layouts designed for this package type.

Q: What is the reverse leakage current specification for each part?

A: Both parts specify 500 nA reverse leakage current. The 2M19Z is measured at 14.4 V reverse voltage, while the 1N5355B-TP is measured at 13.7 V reverse voltage.

Q: Do both parts meet the same compliance and regulatory requirements?

A: Yes. Both parts are RoHS3 compliant, REACH unaffected, classified as EAR99 for export control, and share the identical HTSUS code 8541.10.0050.

Q: What is the maximum power dissipation difference, and when does it matter?

A: The 2M19Z is rated for 2 W maximum power dissipation, while the 1N5355B-TP is rated for 5 W. The higher rating of the 1N5355B-TP provides additional thermal margin in high-current applications but does not affect circuits operating within the 2 W limit.

Q: How does the operating temperature range affect part selection?

A: The 2M19Z operates from -55°C to 175°C, while the 1N5355B-TP operates from -55°C to 150°C. Applications requiring operation above 150°C must use the 2M19Z. The 25°C difference in upper temperature limit is the primary thermal constraint for substitution.