2M19ZH Zener Diode Equivalent & Substitute Parts

Part Overview

The 2M19ZH is an active-status Zener diode manufactured by Taiwan Semiconductor Corporation, rated for 19 V nominal Zener voltage and 2 W maximum power dissipation in a DO-204AC (DO-15) axial through-hole package. This component is qualified to AEC-Q101 automotive standards and complies with ROHS3 and REACH requirements. Substitute parts are identified based on functional equivalence within the Zener diode category, where voltage regulation and power handling characteristics determine interchangeability in circuit applications.

Substiute Parts

2M19ZH

Taiwan Semiconductor CorporationIn Stock: 8292M19ZH Datasheet

Current PartRFQ

1N5355B-TP

Micro Commercial CoIn Stock: 56661N5355B-TP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 2M19ZH is evaluated based on the following critical parameters:

Voltage Compatibility: Zener voltage rating must fall within acceptable tolerance bands for the application circuit. The 2M19ZH operates at 19 V nominal with ±5% tolerance, establishing a functional voltage window of 18.05 V to 19.95 V.

Power Dissipation: Maximum power rating determines thermal capability. The 2M19ZH is rated for 2 W maximum power dissipation.

Package and Mounting: Both the main part and substitute must use through-hole axial mounting in compatible package formats (DO-204AC / DO-15).

Electrical Characteristics: Impedance (Zzt) and reverse leakage current (Ir) define dynamic performance and static behavior under specified conditions.

Environmental and Compliance Standards: Operating temperature range, RoHS compliance, and REACH status must be maintained or exceeded.

The 1N5355B-TP is identified as a substitute based on compatible through-hole axial packaging, overlapping voltage specification (18 V nominal, ±5% tolerance), and equivalent compliance certifications. Differences in power rating, impedance, and maximum operating temperature are documented in the parameter comparison table.

Parameter Comparison

Engineering Selection Recommendations

Primary Part (2M19ZH): Recommended for applications requiring automotive-grade qualification (AEC-Q101), 19 V Zener voltage regulation, and extended operating temperature range to 175°C. This part is active in production with 730 units in stock.

Substitute Part (1N5355B-TP): The 1N5355B-TP is suitable for applications where the 1 V lower Zener voltage (18 V nominal) is acceptable within circuit tolerance margins, and where higher power dissipation capability (5 W versus 2 W) provides thermal margin. This part is active in production with 5645 units in stock. The lower maximum operating temperature (150°C versus 175°C) must be evaluated against application thermal requirements. Both parts maintain ROHS3 compliance and REACH unaffected status.

Voltage Consideration: The 1 V difference between 19 V and 18 V nominal ratings represents a 5.3% deviation. Circuit design must confirm that this voltage shift remains within acceptable regulation tolerances.

Impedance Difference: The 1N5355B-TP exhibits significantly lower impedance (2.5 Ohms versus 11 Ohms), resulting in improved voltage regulation stability under load transients.

Frequently Asked Questions (FAQ)

Q: Can the 1N5355B-TP directly replace the 2M19ZH in all applications?

A: Direct substitution depends on circuit voltage tolerance. The 1 V difference in nominal Zener voltage (18 V versus 19 V) must be evaluated against the application's acceptable regulation band. Both parts share identical ±5% tolerance specifications and compatible through-hole axial packaging.

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

A: Impedance (Zzt) affects dynamic voltage regulation under load changes. The 1N5355B-TP's lower impedance (2.5 Ohms) provides tighter voltage regulation compared to the 2M19ZH (11 Ohms). This may improve performance in noise-sensitive applications but does not affect basic substitution feasibility.

Q: Are both parts suitable for automotive applications?

A: The 2M19ZH carries AEC-Q101 automotive qualification. The 1N5355B-TP does not list automotive qualification in the provided specifications. Applications requiring automotive-grade certification must use the 2M19ZH.

Q: What is the impact of the maximum operating temperature difference?

A: The 2M19ZH operates to 175°C, while the 1N5355B-TP operates to 150°C. Applications with thermal environments exceeding 150°C require the 2M19ZH. For applications below 150°C, both parts are functionally equivalent from a temperature perspective.

Q: Do packaging differences affect mechanical compatibility?

A: Both parts use DO-204AC / DO-15 axial through-hole packages with identical mechanical form factors. The 2M19ZH is supplied in Tape & Reel (TR) format, while the 1N5355B-TP is supplied in Cut Tape (CT) format. This affects handling and assembly processes but not electrical compatibility or board-level installation.

Q: What is the power dissipation consideration for substitution?

A: The 1N5355B-TP is rated for 5 W maximum power, compared to 2 W for the 2M19ZH. This higher rating provides additional thermal margin in the substitute part. If the application requires exactly 2 W dissipation capability, both parts are suitable. If higher power dissipation is anticipated, the 1N5355B-TP offers improved thermal headroom.