3SMBJ5918B-TP Equivalent & Substitute Parts

Part Overview

The 3SMBJ5918B-TP is an active surface mount Zener diode manufactured by Micro Commercial Co, rated at 5.1 V nominal with 3 W maximum power dissipation in a DO-214AA (SMB) package. This component is designed for voltage regulation and transient suppression applications in electronic circuits. Substitute parts are identified to provide alternative sourcing options when the primary part number is unavailable or when inventory constraints require component alternatives that maintain electrical and mechanical compatibility.

Substiute Parts

3SMBJ5918B-TP

Micro Commercial CoIn Stock: 14173SMBJ5918B-TP Datasheet

Current PartRFQ

1SMB5918BT3G

onsemiIn Stock: 429201SMB5918BT3G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 3SMBJ5918B-TP are identified based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:

Critical Matching Parameters:

• Voltage - Zener (Nom): 5.1 V
• Tolerance: ±5%
• Power - Max: 3 W
• Impedance (Max): 4 Ohms
• Current - Reverse Leakage @ Vr: 5 µA @ 2 V
• Voltage - Forward (Vf) (Max) @ If: 1.5 V @ 200 mA
• Package / Case: DO-214AA, SMB
• Mounting Type: Surface Mount
• RoHS Status: ROHS3 Compliant

The substitute part 1SMB5918BT3G meets all critical electrical parameters and maintains the same package designation. Differences in packaging format (Tape & Reel versus Cut Tape & Digi-Reel) and operating temperature range do not affect functional equivalence for standard applications.

Parameter Comparison

Engineering Selection Recommendations

The 1SMB5918BT3G manufactured by onsemi is a direct electrical equivalent to the 3SMBJ5918B-TP. Both components are active products with ROHS3 compliance and identical electrical specifications across all critical parameters. The substitute part provides an extended operating temperature range at the low end (-65°C versus -55°C), which represents an enhancement for applications requiring operation in lower temperature environments.

Selection between these parts should be based on:

1. Availability and Lead Time: The 1SMB5918BT3G has significantly higher inventory availability (42,900 pcs versus 1,324 pcs).
2. Packaging Requirements: The 3SMBJ5918B-TP is supplied in Tape & Reel format, while the 1SMB5918BT3G is available in Cut Tape and Digi-Reel formats. Packaging selection depends on assembly line requirements and minimum order quantities.
3. Temperature Operating Range: For applications operating below -55°C, the 1SMB5918BT3G is the appropriate selection.
4. Regulatory Compliance: Both parts maintain identical RoHS and REACH compliance status.

Frequently Asked Questions (FAQ)

Q: Can the 1SMB5918BT3G replace the 3SMBJ5918B-TP in existing designs?

A: Yes. Both components have identical electrical specifications including Zener voltage (5.1 V), power rating (3 W), impedance (4 Ohms), and forward voltage characteristics. Both use the DO-214AA (SMB) package and are surface mount components. The substitute part is electrically and mechanically compatible.

Q: What is the difference between Tape & Reel and Cut Tape packaging?

A: Tape & Reel (TR) packaging supplies components on a continuous reel suitable for high-volume automated assembly. Cut Tape (CT) packaging provides components on tape segments, typically used for lower-volume orders or manual assembly. Digi-Reel is a proprietary format. The actual component specifications remain identical regardless of packaging format.

Q: Does the extended temperature range of the 1SMB5918BT3G affect its performance at standard operating temperatures?

A: No. The extended low-temperature range (-65°C versus -55°C) does not impact performance at standard operating temperatures. The component maintains all specified electrical parameters across its entire operating range.

Q: Are there any compliance differences between these parts?

A: No. Both the 3SMBJ5918B-TP and 1SMB5918BT3G are ROHS3 compliant, REACH unaffected, and carry identical moisture sensitivity levels (MSL 1 - Unlimited). Regulatory compliance is equivalent.

Q: What should be considered when switching between these part numbers in production?

A: Verify that the packaging format (Tape & Reel versus Cut Tape & Digi-Reel) is compatible with your assembly equipment. Confirm that your supply chain and procurement systems are updated with the new part number. All electrical and mechanical specifications are identical, so no circuit redesign or board layout modifications are required.