1SMA5953 Zener Diode Equivalent & Substitute Parts

Part Overview

The 1SMA5953 is an active-status zener diode rated for 150 V nominal voltage and 1.5 W maximum power dissipation in a surface mount DO-214AC (SMA) package. This component is manufactured by Taiwan Semiconductor Corporation and is ROHS3 compliant with unlimited moisture sensitivity level (MSL 1). The part is suitable for voltage regulation and protection circuits requiring surface mount implementation. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are maintained within the allowed parameter tolerances for this diode category.

Substiute Parts

1SMA5953

Taiwan Semiconductor CorporationIn Stock: 8941SMA5953 Datasheet

Current PartRFQ

3SMAJ5953B-TP

Micro Commercial CoIn Stock: 451813SMAJ5953B-TP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1SMA5953 is determined by the following critical parameters:

Electrical Compatibility Requirements:

• Zener voltage (Vz) must equal 150 V nominal
• Voltage tolerance must be ±5% or tighter
• Operating temperature range must encompass -55°C to 150°C
• Impedance (Zzt) maximum must not exceed 600 Ohms

Mechanical Compatibility Requirements:

• Package type must be DO-214AC (SMA) surface mount
• Mounting type must be surface mount
• Tape & Reel (TR) packaging format

Regulatory & Compliance Requirements:

• ROHS3 compliance required
• MSL rating of 1 (Unlimited) required
• REACH Unaffected status required

The 3SMAJ5953B-TP manufactured by Micro Commercial Co meets all electrical, mechanical, and regulatory criteria for substitution. This part maintains identical zener voltage, tolerance, operating temperature range, impedance specification, and package format. The higher power rating (3 W versus 1.5 W) and lower reverse leakage current represent enhanced performance characteristics that do not preclude substitution in applications designed for the 1SMA5953.

Parameter Comparison

Engineering Selection Recommendations

1SMA5953 Selection Criteria:

• Primary choice when 1.5 W power dissipation specification is a design constraint
• Preferred when lower reverse leakage current (500 nA) is required for precision voltage reference applications
• Suitable for applications with established supply chain qualification for Taiwan Semiconductor Corporation components
• Active product status with 793 units in stock

3SMAJ5953B-TP Selection Criteria:

• Suitable for applications where 1.5 W power rating is not a limiting factor
• Acceptable where higher reverse leakage current (1 µA) does not compromise circuit performance
• Preferred when higher power dissipation capability (3 W) provides design margin
• Active product status with 45,100 units in stock, indicating superior availability
• Both parts maintain ROHS3 compliance, REACH Unaffected status, and identical electrical specifications for zener voltage and tolerance

Both parts are active products with full regulatory compliance. Selection between them depends on application-specific power dissipation requirements and reverse leakage current tolerance.

Frequently Asked Questions (FAQ)

Q: Can the 3SMAJ5953B-TP directly replace the 1SMA5953 in existing designs?

A: Yes. Both parts share identical zener voltage (150 V), tolerance (±5%), impedance (600 Ohms maximum), operating temperature range (-55°C to 150°C), and DO-214AC (SMA) package format. The substitute part has higher power rating (3 W versus 1.5 W) and higher reverse leakage current (1 µA versus 500 nA), which are compatible with applications designed for the 1SMA5953.

Q: What is the difference in power dissipation capability?

A: The 1SMA5953 is rated for 1.5 W maximum power dissipation. The 3SMAJ5953B-TP is rated for 3 W maximum power dissipation. The higher rating of the substitute part does not prevent its use in circuits designed for 1.5 W operation.

Q: Are there package compatibility concerns?

A: No. Both parts use the DO-214AC (SMA) surface mount package with identical mechanical dimensions and land pattern requirements. Both are supplied in Tape & Reel (TR) format.

Q: What is the reverse leakage current difference?

A: The 1SMA5953 specifies 500 nA reverse leakage at 114 V. The 3SMAJ5953B-TP specifies 1 µA reverse leakage at 114 V. Applications requiring minimal leakage current should use the 1SMA5953. Applications where leakage current below 1 µA is acceptable can use either part.

Q: Are both parts RoHS compliant?

A: Yes. Both the 1SMA5953 and 3SMAJ5953B-TP are ROHS3 compliant with MSL rating of 1 (Unlimited) and REACH Unaffected status.

Q: Which part has better availability?

A: The 3SMAJ5953B-TP has significantly higher inventory (45,100 units) compared to the 1SMA5953 (793 units), indicating superior supply availability.