2M20ZH Zener Diode Equivalent & Substitute Parts

Part Overview

The 2M20ZH is an active-status Zener diode manufactured by Taiwan Semiconductor Corporation, rated for 20 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. The device operates across a temperature range of -55°C to 175°C and maintains ±5% voltage tolerance. Substitute parts are identified when equivalent electrical parameters and mechanical compatibility exist, enabling component sourcing flexibility while maintaining circuit performance specifications.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	20	V
Power - Max	2	W
Tolerance	±5	%
Impedance (Max)	11	Ohms
Current - Reverse Leakage @ Vr	500 nA @ 15.2 V	nA
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 2M20ZH are identified based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

Voltage - Zener (Nom): 20 V
Tolerance: ±5%
Current - Reverse Leakage @ Vr: 500 nA @ 15.2 V
Mounting Type: Through Hole
Package / Case: DO-15 or DO-204AC compatible

Secondary Compatibility Factors:

Power - Max rating (equal or greater)
Impedance (Max) rating
Operating Temperature Range (equal or greater)
RoHS3 Compliance
REACH Unaffected status

The 1N5357B-TP meets all primary matching criteria and maintains electrical compatibility with the 2M20ZH. Both devices share identical Zener voltage, tolerance, and reverse leakage specifications. The substitute part provides enhanced power dissipation capability (5 W versus 2 W) and lower impedance (3 Ohms versus 11 Ohms), making it suitable for applications requiring higher power handling. Both components are RoHS3 compliant and REACH unaffected.

Parameter Comparison

Parameter	2M20ZH (Main Part)	1N5357B-TP (Substitute)	Match Status
Manufacturer	Taiwan Semiconductor Corporation	Micro Commercial Co	Different
Voltage - Zener (Nom)	20 V	20 V	Equivalent
Tolerance	±5%	±5%	Equivalent
Power - Max	2 W	5 W	Substitute Higher
Impedance (Max)	11 Ohms	3 Ohms	Substitute Lower
Current - Reverse Leakage @ Vr	500 nA @ 15.2 V	500 nA @ 15.2 V	Equivalent
Operating Temperature Range	-55°C to 175°C	-55°C to 150°C	Main Part Extended
Mounting Type	Through Hole	Through Hole	Equivalent
Package / Case	DO-204AC, DO-15, Axial	DO-15, Axial	Compatible
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
REACH Status	REACH Unaffected	REACH Unaffected	Equivalent

Engineering Selection Recommendations

2M20ZH Selection Criteria:

Applications requiring maximum operating temperature of 175°C
Circuits with power dissipation limited to 2 W
Automotive-grade AEC-Q101 qualified components required
Tape & Reel packaging for automated assembly processes

1N5357B-TP Selection Criteria:

Applications with power dissipation requirements up to 5 W
Lower impedance performance beneficial for circuit stability
Cut Tape packaging suitable for manual or semi-automated assembly
Operating temperature range of -55°C to 150°C acceptable
RoHS3 and REACH compliance requirements met

Both parts maintain active product status and are available in production quantities. Selection between these components depends on specific application power requirements, temperature operating range, and packaging format compatibility with assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the 1N5357B-TP directly replace the 2M20ZH in all applications?

A: The 1N5357B-TP is electrically compatible for Zener voltage, tolerance, and reverse leakage specifications. However, applications requiring operation above 150°C must retain the 2M20ZH due to its extended temperature range to 175°C. Both components are through-hole mounted in DO-15 packages and are mechanically interchangeable.

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

A: The 2M20ZH is rated for 2 W maximum power dissipation, while the 1N5357B-TP is rated for 5 W. The substitute part provides greater thermal headroom and can dissipate higher power levels without exceeding junction temperature limits. Applications operating near the 2 W limit of the original part may benefit from the substitute's higher rating.

Q: How do impedance differences affect circuit performance?

A: The 2M20ZH has maximum impedance of 11 Ohms, while the 1N5357B-TP has maximum impedance of 3 Ohms. Lower impedance in the substitute part results in improved voltage regulation and reduced dynamic impedance effects. This characteristic is beneficial in high-frequency or high-current applications.

Q: Are packaging differences between Tape & Reel and Cut Tape significant?

A: Tape & Reel (TR) packaging is optimized for automated assembly processes, while Cut Tape (CT) packaging is suitable for manual or semi-automated handling. Both formats contain identical components in DO-15 axial packages. Selection depends on assembly process requirements rather than electrical performance.

Q: Do both parts meet automotive qualification standards?

A: The 2M20ZH carries AEC-Q101 automotive qualification. The 1N5357B-TP specifications provided do not indicate AEC-Q101 qualification. Applications requiring automotive-grade components must verify qualification status with the manufacturer before substitution.

Q: What compliance certifications apply to both parts?

A: Both the 2M20ZH and 1N5357B-TP are RoHS3 compliant and REACH unaffected. Both components carry EAR99 ECCN classification and fall under HTSUS code 8541.10.0050. Moisture sensitivity level is 1 (Unlimited) for both parts.

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