1SMB5946 Equivalent & Substitute Parts

Part Overview

The 1SMB5946 is an active surface mount zener diode manufactured by Taiwan Semiconductor Corporation, rated for 75 V nominal zener voltage and 3 W maximum power dissipation in a DO-214AA (SMB) package. This component is designed for voltage regulation and transient suppression applications requiring precise zener characteristics in compact surface mount form factor. The part is RoHS3 compliant and carries unlimited moisture sensitivity level (MSL 1), indicating suitability for standard storage and handling conditions. Equivalent and substitute parts are identified based on matching or exceeding electrical performance parameters while maintaining package compatibility and regulatory compliance.

Substiute Parts

1SMB5946

Taiwan Semiconductor CorporationIn Stock: 7701SMB5946 Datasheet

Current PartRFQ

SMBJ5374B-TP

Micro Commercial CoIn Stock: 12291SMBJ5374B-TP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 1SMB5946 are identified based on the following critical parameters:

Matching Criteria:

• Zener voltage: 75 V nominal with ±5% tolerance
• Package type: DO-214AA (SMB) surface mount
• Operating temperature range: -55°C to 150°C
• Regulatory compliance: RoHS3 compliant, REACH unaffected
• Moisture sensitivity: MSL 1 (unlimited)

Substitution Logic: The SMBJ5374B-TP qualifies as a substitute because it maintains identical zener voltage (75 V) and tolerance (±5%), operates within the same temperature range, uses the same DO-214AA package, and meets all regulatory requirements. The substitute part exceeds the power rating (5 W versus 3 W) and provides superior electrical characteristics (lower impedance and reverse leakage), making it suitable for direct replacement in applications where the original part is specified.

Parameter Comparison

Engineering Selection Recommendations

Both the 1SMB5946 and SMBJ5374B-TP are active products with full RoHS3 compliance and REACH unaffected status, ensuring regulatory compliance for current and future applications. The SMBJ5374B-TP provides enhanced performance characteristics including higher power dissipation capability (5 W versus 3 W), lower dynamic impedance (45 Ohms versus 140 Ohms), and reduced reverse leakage current (500 nA versus 1 µA at 56 V). Both components maintain identical zener voltage specifications and operating temperature ranges, with identical package form factors and moisture sensitivity ratings. Selection between these parts depends on application power requirements and performance margin requirements rather than functional compatibility.

Frequently Asked Questions (FAQ)

Q: Can SMBJ5374B-TP directly replace 1SMB5946 in existing designs?

A: Yes. Both parts share identical zener voltage (75 V ±5%), operating temperature range (-55°C to 150°C), and DO-214AA package configuration. The substitute part exceeds the original specification in power rating and electrical performance, making it functionally compatible for direct substitution.

Q: What are the key differences between these parts?

A: The primary differences are power dissipation rating (5 W versus 3 W), dynamic impedance (45 Ohms versus 140 Ohms), and reverse leakage current (500 nA versus 1 µA at 56 V). The substitute part provides superior electrical characteristics while maintaining identical voltage regulation performance.

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

A: Yes. Both the 1SMB5946 and SMBJ5374B-TP operate across the identical temperature range of -55°C to 150°C junction temperature, making them suitable for equivalent thermal environments.

Q: Do package dimensions differ between these parts?

A: No. Both components use the DO-214AA (SMB) surface mount package, ensuring identical PCB footprint and mounting compatibility.

Q: Are there any regulatory compliance differences?

A: No. Both parts are RoHS3 compliant, REACH unaffected, and carry MSL 1 (unlimited) moisture sensitivity ratings, providing equivalent regulatory status for procurement and deployment.

Q: Which part should be selected for new designs?

A: Selection depends on application power dissipation requirements. For applications requiring 3 W or less, either part is suitable. For applications with higher power dissipation or requiring lower impedance characteristics, the SMBJ5374B-TP provides enhanced performance margin.