2M39ZH Zener Diode Equivalent & Substitute Parts

Part Overview

The 2M39ZH is an active automotive-grade Zener diode manufactured by Taiwan Semiconductor Corporation, rated for 39 V nominal Zener voltage and 2 W maximum power dissipation in a DO-204AC (DO-15) axial through-hole package. This component is AEC-Q101 qualified and RoHS3 compliant, suitable for voltage regulation and protection circuits in automotive and industrial applications. Substitute parts are identified based on matching electrical specifications and mechanical compatibility to ensure functional equivalence in circuit applications.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	39	V
Tolerance	±5%	%
Power - Max	2	W
Impedance (Max)	30	Ohms
Current - Reverse Leakage @ Vr	500	nA @ 29.7 V
Operating Temperature Range	-55 to 175	°C
Mounting Type	Through Hole
Package / Case	DO-204AC, DO-15, Axial
Grade	Automotive
Qualification	AEC-Q101

Substitute Part Grouping Explanation

Substitute parts for the 2M39ZH are identified based on the following critical electrical and mechanical parameters:

Matching Criteria:

Zener voltage (Nom): 39 V
Voltage tolerance: ±5%
Reverse leakage current: 500 nA @ 29.7 V
Package type: DO-15 axial through-hole
Mounting: Through hole
RoHS3 compliance
REACH unaffected status

Substitution Logic: The 1N5366B-TP qualifies as a substitute because it maintains the same nominal Zener voltage (39 V), tolerance (±5%), reverse leakage specification (500 nA @ 29.7 V), and through-hole axial package configuration. Both components are active products with identical regulatory compliance (RoHS3, REACH unaffected, EAR99 ECCN classification). The substitute part differs in maximum power rating (5 W versus 2 W) and impedance characteristics, which represent enhanced performance capabilities rather than incompatibilities.

Parameter Comparison

Parameter	2M39ZH	1N5366B-TP	Unit
Manufacturer	Taiwan Semiconductor Corporation	Micro Commercial Co
Voltage - Zener (Nom)	39	39	V
Tolerance	±5%	±5%	%
Power - Max	2	5	W
Impedance (Max)	30	14	Ohms
Current - Reverse Leakage @ Vr	500 @ 29.7 V	500 @ 29.7 V	nA
Operating Temperature Range	-55 to 175	-55 to 150	°C
Mounting Type	Through Hole	Through Hole
Package / Case	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected
Product Status	Active	Active

Engineering Selection Recommendations

Both the 2M39ZH and 1N5366B-TP are active products with identical regulatory compliance profiles (RoHS3 compliant, REACH unaffected, EAR99 ECCN classification). Selection between these components depends on application power dissipation requirements and thermal management constraints.

The 2M39ZH is specified for 2 W maximum power dissipation with an operating temperature range of -55°C to 175°C. The 1N5366B-TP provides enhanced power handling at 5 W with an operating temperature range of -55°C to 150°C. Both components maintain the same Zener voltage specification (39 V ±5%) and reverse leakage characteristics (500 nA @ 29.7 V), ensuring electrical equivalence in voltage regulation and protection functions.

The 1N5366B-TP exhibits lower impedance (14 Ohms maximum versus 30 Ohms), which results in improved voltage regulation performance under load variations. Component selection should be based on circuit power dissipation requirements, available thermal management, and the specific operating temperature profile of the application.

Frequently Asked Questions (FAQ)

Q: Can the 1N5366B-TP directly replace the 2M39ZH in all applications?

A: The 1N5366B-TP is electrically equivalent for voltage regulation and protection functions, as both components maintain identical Zener voltage (39 V ±5%) and reverse leakage specifications (500 nA @ 29.7 V). Both use the same DO-15 axial through-hole package. The 1N5366B-TP provides higher power dissipation capability (5 W versus 2 W), making it suitable for applications requiring greater power handling. Verify that the application's thermal environment and circuit design accommodate the substitute component's specifications.

Q: What are the key electrical differences between these components?

A: The primary electrical differences are maximum power dissipation (2M39ZH: 2 W; 1N5366B-TP: 5 W) and impedance (2M39ZH: 30 Ohms maximum; 1N5366B-TP: 14 Ohms maximum). The lower impedance of the 1N5366B-TP provides superior voltage regulation performance. Both components share identical Zener voltage (39 V), tolerance (±5%), and reverse leakage current specifications.

Q: Are both components suitable for automotive applications?

A: The 2M39ZH carries automotive grade designation with AEC-Q101 qualification. The 1N5366B-TP is an active product with RoHS3 compliance and REACH unaffected status. Verify the 1N5366B-TP's specific automotive qualification requirements for your application before selection.

Q: What is the operating temperature difference between these parts?

A: The 2M39ZH operates from -55°C to 175°C (junction temperature). The 1N5366B-TP operates from -55°C to 150°C. The 2M39ZH provides a 25°C higher maximum operating temperature. Select based on your application's thermal requirements and ambient operating conditions.

Q: Are both components RoHS3 compliant?

A: Yes, both the 2M39ZH and 1N5366B-TP are RoHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic component manufacturing and use.

Q: What packaging formats are available for these Zener diodes?

A: Both components are supplied in DO-15 axial through-hole packages suitable for through-hole PCB assembly. The 2M39ZH is supplied in Tape & Reel (TR) packaging, while the 1N5366B-TP is supplied in Cut Tape (CT) packaging. Both package formats are compatible with standard component handling and placement equipment.

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