1SMA150Z Zener Diode Equivalent & Substitute Parts

Part Overview

The 1SMA150Z is a surface mount Zener diode manufactured by Taiwan Semiconductor Corporation, rated for 150 V nominal Zener voltage with 1.25 W maximum power dissipation in a DO-214AC (SMA) package. This component is classified as Active product status and is RoHS3 compliant. Equivalent and substitute parts are identified based on matching electrical specifications and package compatibility to support procurement flexibility, inventory management, and supply chain continuity.

Substiute Parts

1SMA150Z

Taiwan Semiconductor CorporationIn Stock: 21031SMA150Z Datasheet

Current PartRFQ

3SMAJ5953B-TP

Micro Commercial CoIn Stock: 451813SMAJ5953B-TP Datasheet

SimilarRFQ

BZG03C150G

onsemiIn Stock: 1587BZG03C150G Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 1SMA150Z are qualified based on the following electrical and mechanical parameters:

Primary Matching Criteria:

• Zener voltage (Nom): 150 V
• Package / Case: DO-214AC or SMA
• Mounting Type: Surface Mount
• Tolerance: ±5% or ±6%
• RoHS3 Compliance: Required
• Moisture Sensitivity Level: 1 (Unlimited)

Substitution Logic: Parts are grouped as substitutes when they maintain the same nominal Zener voltage (150 V) and are housed in compatible surface mount packages (DO-214AC/SMA). Variations in maximum power rating, impedance, and operating temperature range are permitted within the constraints of the application circuit. All substitute parts listed maintain RoHS3 compliance and MSL Level 1 rating, ensuring compatibility with standard manufacturing and storage conditions.

Parameter Comparison

Engineering Selection Recommendations

1SMA150Z (Main Part): The 1SMA150Z is the primary reference component with Active product status, RoHS3 compliance, and MSL Level 1 rating. It provides 1.25 W power dissipation with ±5% voltage tolerance and operates across -55°C to 175°C. This part is suitable for applications requiring the specified thermal range and power budget.

BZG03C150G (onsemi): The BZG03C150G is an Active product from onsemi with RoHS3 compliance and MSL Level 1 rating. It offers 1.5 W power dissipation (20% higher than the main part) with ±6% voltage tolerance and operates from -65°C to 150°C. The lower impedance (300 Ohms vs. 1000 Ohms) provides improved dynamic response characteristics. This substitute is suitable for applications where higher power dissipation capacity or extended low-temperature operation is required, provided the upper temperature limit of 150°C is acceptable.

3SMAJ5953B-TP (Micro Commercial Co): The 3SMAJ5953B-TP is an Active product from Micro Commercial Co with RoHS3 compliance and MSL Level 1 rating. It provides 3 W power dissipation (2.4 times the main part) with ±5% voltage tolerance and operates from -55°C to 150°C. The intermediate impedance (600 Ohms) balances performance characteristics. This substitute is suitable for applications requiring significantly higher power dissipation capacity, provided the upper temperature limit of 150°C is acceptable.

All three parts maintain identical nominal Zener voltage (150 V), compatible surface mount packaging (DO-214AC/SMA), and equivalent compliance certifications. Selection among these parts depends on application-specific power dissipation requirements and operating temperature constraints.

Frequently Asked Questions (FAQ)

Q: Can the BZG03C150G or 3SMAJ5953B-TP be used as direct replacements for the 1SMA150Z?

A: Yes, both parts are direct substitutes in terms of Zener voltage (150 V) and package compatibility (DO-214AC/SMA surface mount). However, the upper operating temperature limit differs: BZG03C150G and 3SMAJ5953B-TP are rated to 150°C maximum, while the 1SMA150Z operates to 175°C. Applications requiring operation above 150°C must use the 1SMA150Z.

Q: What is the significance of impedance differences among these parts?

A: Impedance (Zzt) affects the dynamic response of the Zener diode under transient conditions. The 1SMA150Z has 1000 Ohms impedance, BZG03C150G has 300 Ohms, and 3SMAJ5953B-TP has 600 Ohms. Lower impedance provides faster response to voltage transients. Circuit design and transient suppression requirements determine whether impedance variation is acceptable.

Q: Are all three parts RoHS3 compliant?

A: Yes, all three parts (1SMA150Z, BZG03C150G, and 3SMAJ5953B-TP) are RoHS3 compliant with MSL Level 1 (Unlimited) moisture sensitivity rating. They are suitable for standard manufacturing and storage environments without special handling requirements.

Q: What is the difference between ±5% and ±6% voltage tolerance?

A: The 1SMA150Z and 3SMAJ5953B-TP have ±5% tolerance, while the BZG03C150G has ±6% tolerance. For a 150 V nominal Zener voltage, this represents a tolerance band of ±7.5 V (±5%) or ±9 V (±6%). Applications with tight voltage regulation requirements should account for this tolerance variation in circuit design.

Q: Can I use the 3SMAJ5953B-TP (3 W) in place of the 1SMA150Z (1.25 W)?

A: Yes, the 3SMAJ5953B-TP can be used as a substitute. The higher power rating (3 W vs. 1.25 W) provides additional thermal margin and is backward compatible. However, the upper operating temperature is limited to 150°C instead of 175°C. Verify that the application's maximum operating temperature does not exceed 150°C.

Q: Are there any differences in reverse leakage current among these parts?

A: All three parts specify 1 µA reverse leakage current at their respective reverse voltage test points (114 V for 1SMA150Z and 3SMAJ5953B-TP, 110 V for BZG03C150G). These specifications are equivalent for practical circuit applications.

Q: Do all parts use the same package footprint?

A: Yes, all three parts use the DO-214AC (SMA) surface mount package, ensuring identical PCB footprints and reflow soldering compatibility. No layout modifications are required when substituting among these parts.