1SMB5951B-13 Equivalent & Substitute Parts

Part Overview

The 1SMB5951B-13 is a Zener diode rated at 120 V, 3 W, manufactured by Diodes Incorporated in Surface Mount SMB (DO-214AA) packaging. This component is classified as Active and is ROHS3 Compliant. Zener diodes in this voltage and power class are used for voltage regulation, overvoltage protection, and reference applications in electronic circuits. Substitute parts may be required due to inventory availability, packaging format preferences, or specific application requirements such as automotive qualification.

Substiute Parts

1SMB5951B-13

Diodes IncorporatedIn Stock: 13481SMB5951B-13 Datasheet

Current PartRFQ

SMBJ5380B-TP

Micro Commercial CoIn Stock: 5141SMBJ5380B-TP Datasheet

MFR RecommendedRFQ

1SMB5951BT3G

onsemiIn Stock: 201951SMB5951BT3G Datasheet

Parametric EquivalentRFQ

SZ1SMB5951BT3G

onsemiIn Stock: 6058SZ1SMB5951BT3G Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 1SMB5951B-13 are grouped based on the following critical parameters that determine functional equivalence:

Primary Equivalence Criteria:

• Voltage - Zener (Nom): 120 V
• Tolerance: ±5%
• Package / Case: DO-214AA, SMB (Surface Mount)
• Mounting Type: Surface Mount
• RoHS Status: ROHS3 Compliant
• Operating Temperature Range: -65°C to 150°C minimum

Secondary Consideration:

• Power - Max: 3 W (exact match) or higher rating (5 W acceptable for higher power applications)

Substitute parts are classified into two categories:

1. Parametric Equivalents — Identical electrical specifications and packaging format, differing only in manufacturer or packaging method (Tape & Reel vs. Cut Tape).

2. Manufacturer Recommended Substitute — Higher power rating (5 W vs. 3 W) with improved electrical characteristics, same voltage and package, suitable for applications requiring enhanced thermal performance.

Parameter Comparison

Engineering Selection Recommendations

1SMB5951BT3G (onsemi) — Parametric Equivalent

This part is a direct parametric equivalent with identical electrical specifications (120 V, 3 W, ±5%, 380 Ohms impedance, 1 µA reverse leakage). It maintains the same operating temperature range (-65°C to 150°C) and is ROHS3 Compliant. The primary difference is packaging format (Cut Tape & Digi-Reel® vs. Tape & Reel). This substitute is suitable for applications where packaging method does not impose constraints and onsemi sourcing is preferred.

SZ1SMB5951BT3G (onsemi) — Parametric Equivalent with Automotive Qualification

This part is electrically identical to the main part (120 V, 3 W, ±5%, 380 Ohms impedance, 1 µA reverse leakage) and maintains the same operating temperature range. It carries Automotive Grade designation and AEC-Q101 qualification, making it suitable for automotive applications requiring certified components. Packaging format is Tape & Reel (TR), matching the main part. This substitute is appropriate for designs requiring automotive-grade reliability and traceability.

SMBJ5380B-TP (Micro Commercial Co) — Manufacturer Recommended Substitute

This part shares the same nominal Zener voltage (120 V) and package format (DO-214AA, SMB) but provides enhanced specifications: 5 W power rating (vs. 3 W), lower impedance (170 Ohms vs. 380 Ohms), and lower reverse leakage (500 nA vs. 1 µA). Operating temperature range is -55°C to 150°C (lower minimum temperature than main part). This substitute is suitable for applications requiring higher power dissipation capability or improved impedance characteristics. ROHS3 Compliant and MSL 1 (Unlimited) status maintained.

Frequently Asked Questions (FAQ)

Q: Can I use the 1SMB5951BT3G as a direct replacement for the 1SMB5951B-13?

A: Yes. The 1SMB5951BT3G is a parametric equivalent with identical electrical specifications (120 V, 3 W, ±5% tolerance, 380 Ohms impedance, 1 µA reverse leakage) and the same operating temperature range (-65°C to 150°C). The only difference is the packaging format (Cut Tape & Digi-Reel® vs. Tape & Reel). Both are ROHS3 Compliant and have MSL 1 (Unlimited) rating.

Q: What is the difference between the SZ1SMB5951BT3G and the main part?

A: The SZ1SMB5951BT3G is electrically identical to the 1SMB5951B-13 in all critical parameters (120 V, 3 W, ±5%, 380 Ohms impedance, 1 µA reverse leakage, -65°C to 150°C operating range). The key distinction is that the SZ1SMB5951BT3G carries Automotive Grade designation and AEC-Q101 qualification, making it suitable for automotive applications. Both use Tape & Reel packaging.

Q: When should I use the SMBJ5380B-TP instead of the main part?

A: The SMBJ5380B-TP should be used when your application requires higher power dissipation (5 W vs. 3 W) or lower impedance (170 Ohms vs. 380 Ohms). Both parts maintain the same 120 V Zener voltage and DO-214AA SMB package. The SMBJ5380B-TP also provides lower reverse leakage (500 nA vs. 1 µA). Note that the minimum operating temperature is -55°C (vs. -65°C for the main part).

Q: Are all substitute parts ROHS3 Compliant?

A: Yes. All listed substitute parts (1SMB5951BT3G, SZ1SMB5951BT3G, and SMBJ5380B-TP) are ROHS3 Compliant and have Moisture Sensitivity Level 1 (Unlimited), matching the compliance status of the main part.

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) & Digi-Reel® packaging provides components in smaller quantities on cut tape segments, suitable for lower-volume applications or mixed-component orders. Both formats contain the same component; the difference is in supply method and handling.

Q: Can I substitute the SMBJ5380B-TP in a circuit designed for the 1SMB5951B-13?

A: Yes, with consideration of the enhanced specifications. The SMBJ5380B-TP has the same 120 V Zener voltage and SMB package, making it physically and electrically compatible. The higher power rating (5 W vs. 3 W) and lower impedance (170 Ohms vs. 380 Ohms) provide improved performance in most applications. The lower reverse leakage (500 nA vs. 1 µA) also improves circuit performance. The minimum operating temperature is -55°C instead of -65°C; verify this meets your application requirements.

Q: Which substitute should I choose for an automotive application?

A: The SZ1SMB5951BT3G is the appropriate choice for automotive applications. It carries Automotive Grade designation and AEC-Q101 qualification, ensuring it meets automotive reliability and traceability standards. It maintains identical electrical specifications to the main part (120 V, 3 W, ±5%, 380 Ohms impedance, 1 µA reverse leakage) and the same operating temperature range (-65°C to 150°C).

Q: Are there inventory differences between the substitute parts?

A: Yes. Inventory levels vary: 1SMB5951B-13 (1,242 Pcs), 1SMB5951BT3G (20,100 Pcs), SZ1SMB5951BT3G (6,008 Pcs), and SMBJ5380B-TP (5,120 Pcs). Availability should be confirmed with your supplier for your specific procurement timeline.