2M12Z B0G Zener Diode Equivalent & Substitute Parts

Part Overview

The 2M12Z B0G is an active-status 12 V, 2 W Zener diode manufactured by Taiwan Semiconductor Corporation in DO-204AC (DO-15) axial through-hole packaging. This component is designed for voltage regulation and protection applications requiring a nominal Zener voltage of 12 V with ±5% tolerance. Substitute parts are identified when equivalent electrical performance, mechanical compatibility, and regulatory compliance can be maintained while addressing inventory availability, performance upgrades, or supply chain requirements.

Substiute Parts

2M12Z B0G

Taiwan Semiconductor CorporationIn Stock: 10502M12Z B0G Datasheet

Current PartRFQ

1N5349B-TP

Micro Commercial CoIn Stock: 120861N5349B-TP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 2M12Z B0G is permissible when the following criteria are satisfied:

Critical Matching Parameters:

• Voltage - Zener (Nom): 12 V
• Tolerance: ±5%
• Package / Case: DO-204AC or DO-15 (axial through-hole)
• Mounting Type: Through Hole
• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level: 1 (Unlimited)

Allowable Variations:

• Power - Max: Equal to or greater than 2 W
• Impedance (Max): Equal to or less than 4.5 Ohms
• Current - Reverse Leakage @ Vr: Equal to or less than 1 µA @ 9.1 V
• Operating Temperature Range: Must encompass or equal the original range

The 1N5349B-TP manufactured by Micro Commercial Co qualifies as a substitute part based on these criteria.

Parameter Comparison

Engineering Selection Recommendations

Primary Part: 2M12Z B0G

The 2M12Z B0G remains the specified component when the full operating temperature range of -55°C to 175°C is required. This part is ROHS3 compliant, REACH unaffected, and maintains active product status with 946 units in stock.

Substitute Part: 1N5349B-TP

The 1N5349B-TP is a qualified substitute when the following conditions are met:

1. Operating temperature requirements do not exceed 150°C
2. Enhanced power dissipation capability (5 W versus 2 W) is acceptable or beneficial
3. Improved impedance characteristics (2.5 Ohms versus 4.5 Ohms) are acceptable
4. Slightly elevated reverse leakage current (2 µA versus 1 µA @ 9.1 V) is within circuit tolerance
5. ROHS3 compliance and REACH unaffected status are required

The 1N5349B-TP is ROHS3 compliant, REACH unaffected, maintains active product status, and has 12,009 units in stock. Both parts share identical Zener voltage (12 V), tolerance (±5%), mounting type (through hole), and package designation (DO-204AC, DO-15, axial).

Frequently Asked Questions (FAQ)

Q: Can the 1N5349B-TP replace the 2M12Z B0G in all applications?

A: The 1N5349B-TP is a qualified substitute when the maximum operating temperature does not exceed 150°C. The 2M12Z B0G supports operation to 175°C. Applications requiring the full temperature range must use the 2M12Z B0G.

Q: What is the significance of the power rating difference (2 W versus 5 W)?

A: The 1N5349B-TP has a higher maximum power dissipation rating (5 W) compared to the 2M12Z B0G (2 W). This represents an enhanced capability and does not prevent substitution. The substitute part can safely handle applications designed for the lower power rating.

Q: Are the packages physically identical?

A: Both parts use DO-204AC (DO-15) axial through-hole packaging. Physical dimensions and lead spacing are compatible for direct board-level substitution.

Q: What is the impact of the impedance difference?

A: The 1N5349B-TP has lower maximum impedance (2.5 Ohms) compared to the 2M12Z B0G (4.5 Ohms). Lower impedance provides improved voltage regulation characteristics and is acceptable for substitution.

Q: Does the reverse leakage current difference affect circuit performance?

A: The 1N5349B-TP has a reverse leakage current of 2 µA @ 9.1 V, compared to 1 µA @ 9.1 V for the 2M12Z B0G. This difference is within acceptable engineering tolerances for most voltage regulation and protection applications.

Q: Are both parts RoHS and REACH compliant?

A: Both the 2M12Z B0G and 1N5349B-TP are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What is the primary reason to select the substitute part?

A: The 1N5349B-TP is selected when inventory availability is a consideration (12,009 units in stock versus 946 units) and the operating temperature requirement does not exceed 150°C.