1SMA120Z Zener Diode Equivalent & Substitute Parts

Part Overview

The 1SMA120Z is a surface mount Zener diode manufactured by Taiwan Semiconductor Corporation, rated for 120 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. Alternative equivalent and substitute parts are identified based on matching electrical characteristics, package compatibility, and operational parameters within the Zener diode category.

Substiute Parts

1SMA120Z

Taiwan Semiconductor CorporationIn Stock: 80181SMA120Z Datasheet

Current PartRFQ

1SMA120Z

Taiwan Semiconductor CorporationIn Stock: 80181SMA120Z Datasheet

Parametric EquivalentRFQ

3SMAJ5950B-TP

Micro Commercial CoIn Stock: 299063SMAJ5950B-TP Datasheet

SimilarRFQ

3SMAJ5951B-TP

Micro Commercial CoIn Stock: 149883SMAJ5951B-TP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 1SMA120Z are identified based on the following critical parameters:

Primary Matching Criteria:

• Zener voltage rating: 120 V nominal (±5% tolerance)
• Package type: DO-214AC (SMA) surface mount
• Mounting configuration: Surface mount
• Compliance: RoHS3 compliant

Substitution Logic:

The 1SMA120Z has two identified substitute parts from Micro Commercial Co: the 3SMAJ5950B-TP and 3SMAJ5951B-TP. These substitutes share the same package footprint (DO-214AC/SMA) and surface mount configuration, enabling direct board-level replacement. The 3SMAJ5951B-TP maintains the identical 120 V Zener voltage rating, making it a parametric equivalent. The 3SMAJ5950B-TP operates at 110 V, representing a similar but distinct voltage class within the same package family.

All substitute parts maintain RoHS3 compliance, MSL Level 1 (Unlimited), and REACH Unaffected status, ensuring regulatory compatibility with the original component.

Parameter Comparison

Engineering Selection Recommendations

1SMA120Z (Taiwan Semiconductor Corporation)

The 1SMA120Z is the primary reference component with Active product status. It provides 1.25 W power dissipation in the DO-214AC package with a 120 V Zener rating. This component is RoHS3 compliant and carries MSL Level 1 classification, indicating no moisture sensitivity constraints during storage and handling.

3SMAJ5951B-TP (Micro Commercial Co) - Parametric Equivalent

The 3SMAJ5951B-TP is a direct parametric equivalent, matching the 120 V Zener voltage specification of the 1SMA120Z. This substitute offers increased power dissipation capability (3 W versus 1.25 W) while maintaining the same DO-214AC package footprint and surface mount configuration. The component is RoHS3 compliant with MSL Level 1 status. The operating temperature range is -55 to 150°C, which is narrower than the 1SMA120Z (-55 to 175°C). This substitute is suitable for applications where the higher power rating provides design margin or where the 150°C upper temperature limit is acceptable.

3SMAJ5950B-TP (Micro Commercial Co) - Similar Voltage Class

The 3SMAJ5950B-TP operates at 110 V nominal Zener voltage, representing a similar but distinct voltage class. This component shares the DO-214AC package and surface mount configuration with the 1SMA120Z. It provides 3 W power dissipation and is RoHS3 compliant with MSL Level 1 status. The 110 V rating differs from the 120 V specification, making this substitute applicable only in applications where the lower voltage is functionally acceptable.

All substitute parts maintain regulatory compliance (RoHS3, REACH Unaffected) and are classified as Active products with unlimited moisture sensitivity levels.

Frequently Asked Questions (FAQ)

Q: Can the 3SMAJ5951B-TP directly replace the 1SMA120Z on a circuit board?

A: Yes. Both components share the DO-214AC (SMA) package footprint and surface mount configuration, enabling direct board-level replacement. The 3SMAJ5951B-TP maintains the identical 120 V Zener voltage rating and ±5% tolerance. The higher power rating (3 W versus 1.25 W) does not prevent substitution; however, the operating temperature range is limited to -55 to 150°C compared to the 1SMA120Z range of -55 to 175°C.

Q: What is the difference between the 3SMAJ5951B-TP and 3SMAJ5950B-TP?

A: The primary difference is the Zener voltage rating. The 3SMAJ5951B-TP is rated for 120 V (matching the 1SMA120Z), while the 3SMAJ5950B-TP is rated for 110 V. Both share the same DO-214AC package, 3 W power rating, and surface mount configuration. The 110 V rating of the 3SMAJ5950B-TP makes it suitable only for applications where this lower voltage is functionally acceptable.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. The 1SMA120Z, 3SMAJ5951B-TP, and 3SMAJ5950B-TP are all RoHS3 compliant. All three components are also REACH Unaffected and carry MSL Level 1 (Unlimited) moisture sensitivity classification.

Q: What is the impedance difference between the main part and substitutes?

A: The 1SMA120Z has a maximum impedance of 550 Ohms. The 3SMAJ5951B-TP has 380 Ohms maximum impedance, and the 3SMAJ5950B-TP has 300 Ohms maximum impedance. Lower impedance values in the substitute parts may affect circuit behavior in applications sensitive to Zener impedance characteristics.

Q: Can the 1SMA120Z be used in applications requiring higher power dissipation?

A: The 1SMA120Z is rated for 1.25 W maximum power dissipation. Applications requiring higher power dissipation should use the 3SMAJ5951B-TP (3 W) or 3SMAJ5950B-TP (3 W), both of which provide increased power handling capability in the same DO-214AC package.

Q: What is the temperature operating range difference?

A: The 1SMA120Z operates from -55 to 175°C. Both substitute parts (3SMAJ5951B-TP and 3SMAJ5950B-TP) operate from -55 to 150°C. Applications requiring operation above 150°C must use the 1SMA120Z.

Q: Are the reverse leakage current specifications identical?

A: The 1SMA120Z and 3SMAJ5951B-TP both specify 1 µA reverse leakage at 91.2 V. The 3SMAJ5950B-TP specifies 1 µA reverse leakage at 83.6 V, corresponding to its 110 V Zener rating. The measurement voltage differs due to the different Zener voltage ratings.