2M43ZH Zener Diode Equivalent & Substitute Parts

Part Overview

The 2M43ZH is an active-status Zener diode manufactured by Taiwan Semiconductor Corporation, rated for 43 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 qualified to AEC-Q101 automotive standards. Substitute parts are identified when equivalent electrical parameters and mechanical compatibility exist, enabling component sourcing flexibility while maintaining circuit performance specifications.

Substiute Parts

2M43ZH

Taiwan Semiconductor CorporationIn Stock: 8442M43ZH Datasheet

Current PartRFQ

1N5367B-TP

Micro Commercial CoIn Stock: 49301N5367B-TP Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 2M43ZH is permissible when the alternative component meets the following criteria:

Critical Matching Parameters:

• Voltage - Zener (Nom): 43 V
• Tolerance: ±5%
• Current - Reverse Leakage @ Vr: 500 nA @ 32.7 V
• Mounting Type: Through Hole
• Package / Case: DO-204AC or DO-15 (Axial)
• RoHS Status: ROHS3 Compliant

Allowable Variation Parameters:

• Power - Max: Equal to or greater than 2 W
• Impedance (Max): Equal to or less than 35 Ohms
• Operating Temperature Range: Must encompass or exceed -55°C to 175°C

The 1N5367B-TP manufactured by Micro Commercial Co satisfies all critical matching parameters and allowable variation criteria. This component provides identical Zener voltage and tolerance specifications, equivalent reverse leakage characteristics, and compatible through-hole axial packaging. The 1N5367B-TP exceeds the power rating (5 W versus 2 W) and provides superior impedance performance (20 Ohms versus 35 Ohms maximum), making it a direct functional substitute.

Parameter Comparison

Engineering Selection Recommendations

2M43ZH Selection Criteria: The 2M43ZH is appropriate for applications requiring AEC-Q101 automotive qualification and extended operating temperature range to 175°C. This component is suitable for automotive-grade circuits where regulatory compliance and temperature performance are specified design requirements.

1N5367B-TP Selection Criteria: The 1N5367B-TP is appropriate for applications where higher power dissipation capacity (5 W) and lower impedance (20 Ohms) provide performance advantages. This component is suitable for general-purpose and commercial-grade circuits. The operating temperature range extends to 150°C, which is adequate for most non-automotive applications. The 1N5367B-TP is ROHS3 compliant and maintains active product status.

Substitution Constraints: The 1N5367B-TP does not carry AEC-Q101 automotive qualification. Applications requiring automotive-grade certification must use the 2M43ZH or equivalent AEC-Q101 qualified components. The 1N5367B-TP maximum operating temperature of 150°C is 25°C lower than the 2M43ZH; applications requiring operation above 150°C must use the 2M43ZH.

Frequently Asked Questions (FAQ)

Q: Can the 1N5367B-TP replace the 2M43ZH in automotive applications?

A: The 1N5367B-TP is not AEC-Q101 qualified. Automotive applications requiring AEC-Q101 certification must use the 2M43ZH or other AEC-Q101 qualified alternatives. Non-automotive applications may use the 1N5367B-TP.

Q: What is the significance of the higher power rating on the 1N5367B-TP?

A: The 1N5367B-TP is rated for 5 W maximum power dissipation compared to 2 W for the 2M43ZH. This higher rating provides additional thermal margin in applications with higher power dissipation requirements. Both components maintain identical Zener voltage and tolerance specifications.

Q: Are the DO-204AC and DO-15 packages physically identical?

A: DO-204AC and DO-15 refer to the same axial through-hole package configuration. Both the 2M43ZH and 1N5367B-TP use this package type and are mechanically compatible for board-level substitution.

Q: What does the ±5% tolerance mean for Zener voltage?

A: The ±5% tolerance indicates that the actual Zener voltage will fall within the range of 40.85 V to 45.15 V (43 V ± 5%). Both the 2M43ZH and 1N5367B-TP share this tolerance specification.

Q: Why is the operating temperature range different between these parts?

A: The 2M43ZH operates from -55°C to 175°C, while the 1N5367B-TP operates from -55°C to 150°C. The 2M43ZH is designed for extended high-temperature operation, which is typical for automotive-grade components. Applications requiring operation above 150°C must use the 2M43ZH.

Q: What does impedance (Zzt) represent in a Zener diode?

A: Impedance (Zzt) is the dynamic impedance of the Zener diode in the reverse breakdown region. Lower impedance values indicate better voltage regulation performance. The 1N5367B-TP provides 20 Ohms maximum impedance compared to 35 Ohms for the 2M43ZH, resulting in superior voltage regulation characteristics.

Q: Are both parts RoHS compliant?

A: Yes, both the 2M43ZH and 1N5367B-TP are ROHS3 compliant, meeting environmental and hazardous substance restrictions.

Q: What is the reverse leakage current specification?

A: Both components specify 500 nA maximum reverse leakage current measured at 32.7 V. This parameter indicates the small current that flows through the Zener diode when reverse biased below the breakdown voltage.