2M6.8ZH Zener Diode Equivalent & Substitute Parts

Part Overview

The 2M6.8ZH is an active automotive-grade zener diode manufactured by Taiwan Semiconductor Corporation, rated for 6.8 V nominal zener voltage with 2 W maximum power dissipation. The device is packaged in DO-204AC (DO-15) axial through-hole configuration and complies with AEC-Q101 automotive qualification standards. Substitute parts are identified to provide alternative sourcing options when the primary part number is unavailable or when design requirements permit higher performance specifications within the same electrical classification.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	6.8	V
Tolerance	±5%	%
Power - Max	2	W
Impedance (Max)	1.5	Ohms
Current - Reverse Leakage @ Vr	1	mA @ 5.5 V
Operating Temperature Range	-55 to 175	°C
Package / Case	DO-204AC (DO-15)	Axial
Mounting Type	Through Hole
Grade	Automotive
Qualification	AEC-Q101
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the 2M6.8ZH is permissible with the 1N5342B-TP based on the following alignment of critical electrical parameters:

Matching Parameters:

Zener voltage (Nom): Both rated 6.8 V
Tolerance: Both ±5%
Package / Case: Both DO-204AC (DO-15) axial through-hole
Mounting Type: Both through-hole
RoHS Status: Both ROHS3 Compliant
Moisture Sensitivity Level: Both MSL 1 (Unlimited)

Differing Parameters:

Power - Max: 2M6.8ZH rated 2 W; 1N5342B-TP rated 5 W
Impedance (Max): 2M6.8ZH 1.5 Ohms; 1N5342B-TP 1 Ohms
Current - Reverse Leakage: 2M6.8ZH 1 mA @ 5.5 V; 1N5342B-TP 10 µA @ 5.2 V
Operating Temperature Range: 2M6.8ZH -55°C to 175°C; 1N5342B-TP -55°C to 150°C
Packaging Format: 2M6.8ZH supplied in Tape & Reel (TR); 1N5342B-TP supplied in Cut Tape (CT)

The 1N5342B-TP provides enhanced performance characteristics with higher power rating and lower impedance, making it suitable for applications where the 2M6.8ZH specifications are met or exceeded.

Parameter Comparison

Parameter	2M6.8ZH (Main Part)	1N5342B-TP (Substitute)
Manufacturer	Taiwan Semiconductor Corporation	Micro Commercial Co
Voltage - Zener (Nom)	6.8 V	6.8 V
Tolerance	±5%	±5%
Power - Max	2 W	5 W
Impedance (Max)	1.5 Ohms	1 Ohms
Current - Reverse Leakage @ Vr	1 mA @ 5.5 V	10 µA @ 5.2 V
Operating Temperature Range	-55°C to 175°C	-55°C to 150°C
Package / Case	DO-204AC (DO-15)	DO-204AC (DO-15)
Mounting Type	Through Hole	Through Hole
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active

Engineering Selection Recommendations

Both the 2M6.8ZH and 1N5342B-TP are active products with ROHS3 compliance and REACH unaffected status, suitable for production applications. The 2M6.8ZH is qualified to AEC-Q101 automotive standards, establishing its suitability for automotive-grade applications. The 1N5342B-TP, while not explicitly listed with automotive qualification in the provided data, shares identical zener voltage and tolerance specifications with superior power handling and lower impedance characteristics.

Selection between these parts depends on application power dissipation requirements and operating temperature constraints. The 2M6.8ZH supports operation to 175°C junction temperature, while the 1N5342B-TP operates to 150°C. Applications requiring the full 175°C operating range must retain the 2M6.8ZH. Applications operating within -55°C to 150°C may utilize the 1N5342B-TP, which provides enhanced performance margin through higher power rating and lower impedance.

Frequently Asked Questions (FAQ)

Q: Can the 1N5342B-TP directly replace the 2M6.8ZH in all applications?

A: Direct replacement is permissible for applications operating within the 1N5342B-TP temperature range (-55°C to 150°C). Applications requiring operation above 150°C junction temperature must use the 2M6.8ZH. Both parts share identical zener voltage (6.8 V) and tolerance (±5%), with the 1N5342B-TP offering higher power rating and lower impedance.

Q: What is the significance of the different power ratings (2 W vs. 5 W)?

A: Power rating indicates maximum continuous power dissipation capability. The 1N5342B-TP 5 W rating provides greater thermal margin in applications with higher current or voltage stress. The 2M6.8ZH 2 W rating is sufficient for lower-power applications. Circuit design must ensure actual power dissipation does not exceed the selected part's rating.

Q: Are the packaging formats interchangeable?

A: Both parts use DO-204AC (DO-15) axial through-hole packages, making them mechanically and electrically interchangeable on printed circuit boards. The 2M6.8ZH is supplied in Tape & Reel (TR) format, while the 1N5342B-TP is supplied in Cut Tape (CT) format. These are supply format differences only and do not affect component performance or board-level compatibility.

Q: What does the impedance difference (1.5 Ohms vs. 1 Ohm) mean for circuit performance?

A: Impedance (Zzt) represents dynamic impedance at the zener voltage. Lower impedance (1 Ohm for 1N5342B-TP) results in better voltage regulation and reduced voltage ripple across the zener diode. The 1N5342B-TP provides superior regulation characteristics compared to the 2M6.8ZH.

Q: Why is the reverse leakage current different between the two parts?

A: Reverse leakage current (1 mA @ 5.5 V for 2M6.8ZH vs. 10 µA @ 5.2 V for 1N5342B-TP) reflects manufacturing process differences between manufacturers. The 1N5342B-TP exhibits lower leakage, indicating superior reverse-bias characteristics. Both values are within acceptable ranges for zener diode operation.

Q: Is AEC-Q101 qualification required for my application?

A: AEC-Q101 qualification is mandatory for automotive-grade applications. The 2M6.8ZH carries explicit AEC-Q101 qualification. If automotive qualification is required, the 2M6.8ZH must be specified. For non-automotive applications, the 1N5342B-TP is suitable without automotive qualification.

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