1SMA160Z Zener Diode Equivalent & Substitute Parts

Part Overview

The 1SMA160Z is an active surface mount zener diode manufactured by Taiwan Semiconductor Corporation, rated for 160 V nominal zener voltage and 1.25 W maximum power dissipation in a DO-214AC (SMA) package. This component is designed for voltage regulation and transient protection applications requiring precise voltage clamping at 160 V. Substitute parts become necessary when the primary part is unavailable, when inventory constraints require alternative sourcing, or when application requirements permit operation at alternative voltage or power ratings within the same package family.

Substiute Parts

1SMA160Z

Taiwan Semiconductor CorporationIn Stock: 49491SMA160Z Datasheet

Current PartRFQ

3SMAJ5953B-TP

Micro Commercial CoIn Stock: 451813SMAJ5953B-TP Datasheet

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BZG03C150G

onsemiIn Stock: 1587BZG03C150G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of zener diodes is determined by the following critical parameters:

Primary Substitution Criteria:

• Package compatibility: All substitute parts must use DO-214AC (SMA) surface mount package
• Zener voltage rating: Substitutes operate at 150 V nominal, representing a 10 V reduction from the primary part
• Power dissipation: Substitute parts range from 1.5 W to 3 W, accommodating applications with equal or lower power requirements
• Voltage tolerance: Substitutes maintain ±5% to ±6% tolerance specifications
• Reverse leakage current: All parts maintain 1 µA maximum leakage at their respective reverse voltage ratings
• Operating temperature range: Substitutes support -55°C to -65°C minimum and 150°C maximum
• Compliance: All parts maintain ROHS3 compliance and RoHS3 certification

Substitution Logic: The 1SMA160Z operates at 160 V zener voltage. The identified substitute parts (3SMAJ5953B-TP and BZG03C150G) operate at 150 V zener voltage. These substitutes are applicable in circuits where the lower voltage rating satisfies the application requirements or where voltage regulation at 150 V is acceptable. The higher power ratings of certain substitutes (3 W for 3SMAJ5953B-TP versus 1.25 W for the primary part) provide additional thermal margin in power-limited applications.

Parameter Comparison

Engineering Selection Recommendations

1SMA160Z (Primary Part) The 1SMA160Z is the specified component for applications requiring 160 V zener voltage regulation with 1.25 W power dissipation. This part maintains active product status with full manufacturing support. The operating temperature range extends to 175°C, providing thermal margin for high-temperature environments. ROHS3 compliance and RoHS3 certification confirm regulatory compliance for restricted substance use.

3SMAJ5953B-TP (Micro Commercial Co Substitute) The 3SMAJ5953B-TP operates at 150 V zener voltage with 3 W maximum power dissipation. This part is suitable for applications where the lower voltage rating is acceptable and where increased power handling capacity is beneficial. The ±5% tolerance matches the primary part specification. Operating temperature maximum is 150°C, which is 25°C lower than the primary part. ROHS3 compliance and active product status confirm regulatory and manufacturing support.

BZG03C150G (onsemi Substitute) The BZG03C150G operates at 150 V zener voltage with 1.5 W maximum power dissipation, providing power rating closer to the primary part. The ±6% tolerance is slightly broader than the primary part specification. Operating temperature minimum extends to -65°C, providing enhanced low-temperature performance. Operating temperature maximum is 150°C. ROHS3 compliance and active product status confirm regulatory and manufacturing support.

All substitute parts maintain identical package specifications (DO-214AC, SMA), surface mount mounting type, and regulatory compliance status. Selection between substitutes depends on application-specific requirements for voltage rating, power dissipation, tolerance, and operating temperature range.

Frequently Asked Questions (FAQ)

Q: Can the 3SMAJ5953B-TP substitute for the 1SMA160Z in all applications?

A: The 3SMAJ5953B-TP operates at 150 V zener voltage compared to the 1SMA160Z at 160 V. Substitution is valid only in applications where 150 V voltage regulation satisfies the circuit requirements. The 10 V voltage difference must be evaluated against the application's voltage tolerance specifications.

Q: What is the primary difference between the two substitute parts?

A: The 3SMAJ5953B-TP provides 3 W maximum power dissipation, while the BZG03C150G provides 1.5 W. Both operate at 150 V zener voltage. The 3SMAJ5953B-TP is suitable for higher power applications, while the BZG03C150G provides power rating closer to the primary part. The BZG03C150G offers extended low-temperature operation to -65°C.

Q: Are all substitute parts compatible with the same PCB footprint?

A: Yes. All parts use the DO-214AC (SMA) package with identical surface mount footprint. No PCB layout modifications are required for substitution.

Q: What is the impact of the tolerance difference between the primary part and BZG03C150G?

A: The 1SMA160Z maintains ±5% tolerance, while the BZG03C150G maintains ±6% tolerance. The additional 1% tolerance band may affect voltage regulation precision in applications with tight voltage specifications. This difference must be evaluated against application requirements.

Q: Can the 1SMA160Z be used in place of the substitute parts?

A: The 1SMA160Z operates at 160 V, which is 10 V higher than the substitute parts at 150 V. Use of the primary part in place of substitutes is valid only in applications where the higher voltage rating is acceptable or required.

Q: What is the significance of the impedance values listed for each part?

A: Impedance (Zzt) affects the dynamic response of the zener diode during transient voltage events. The 1SMA160Z has 1100 Ohms maximum impedance, while substitutes range from 300 to 600 Ohms. Lower impedance provides faster transient response. Application-specific transient protection requirements determine whether impedance differences are significant.

Q: Are all parts suitable for high-temperature applications?

A: The 1SMA160Z supports operation to 175°C, making it suitable for high-temperature environments. Both substitute parts support operation to 150°C maximum, which is 25°C lower. Applications requiring operation above 150°C require the primary part.

Q: What does ROHS3 compliance indicate?

A: ROHS3 compliance confirms that the part meets Restriction of Hazardous Substances Directive requirements, restricting the use of specific hazardous materials in electrical and electronic equipment. All listed parts maintain ROHS3 compliance.