1SMB5943B-13 Equivalent & Substitute Parts

Part Overview

The 1SMB5943B-13 is a Zener diode rated at 56 V nominal voltage with 3 W maximum power dissipation in a surface mount SMB (DO-214AA) package. Manufactured by Diodes Incorporated, this component is classified as Active and fully compliant with RoHS3 and REACH regulations. Substitute parts are identified to provide alternative sourcing options when the primary manufacturer part is unavailable or when supply chain optimization is required.

Substiute Parts

1SMB5943B-13

Diodes IncorporatedIn Stock: 23301SMB5943B-13 Datasheet

Current PartRFQ

1SMB5943BT3G

onsemiIn Stock: 377321SMB5943BT3G Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1SMB5943B-13 is determined by electrical and mechanical parameter equivalence. The following criteria establish substitution validity:

Electrical Parameters (Must Match):

• Voltage - Zener (Nom): 56 V
• Tolerance: ±5%
• Power - Max: 3 W
• Impedance (Max): 86 Ohms
• Current - Reverse Leakage @ Vr: 1 µA @ 42.6 V
• Voltage - Forward (Vf) (Max) @ If: 1.5 V @ 200 mA
• Operating Temperature Range: -65°C to 150°C

Mechanical Parameters (Must Match):

• Mounting Type: Surface Mount
• Package / Case: DO-214AA, SMB

Compliance Parameters (Must Match):

• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level: 1 (Unlimited)

The substitute part 1SMB5943BT3G meets all electrical, mechanical, and compliance requirements and is therefore a direct functional equivalent.

Parameter Comparison

Engineering Selection Recommendations

Both the 1SMB5943B-13 and 1SMB5943BT3G are Active products with identical electrical specifications and mechanical packaging. Selection between these parts is based on availability and supply chain requirements:

1SMB5943B-13 (Diodes Incorporated): Primary sourcing option with 2232 pieces in stock. Packaged in Tape & Reel (TR) format.

1SMB5943BT3G (onsemi): Direct substitute with 37700 pieces in stock. Packaged in Cut Tape (CT) & Digi-Reel® format. Higher inventory availability supports extended lead time mitigation.

Both parts satisfy RoHS3 compliance, REACH unaffected status, and MSL 1 (Unlimited) moisture sensitivity classification. No performance degradation occurs when substituting between these parts in applications requiring 56 V Zener diodes with 3 W power rating in SMB surface mount packages.

Frequently Asked Questions (FAQ)

Q: Can 1SMB5943BT3G replace 1SMB5943B-13 in production designs?

A: Yes. The 1SMB5943BT3G is electrically and mechanically equivalent. All critical parameters including Zener voltage, power rating, impedance, leakage current, forward voltage, and operating temperature range are identical. Both parts use the same DO-214AA SMB package.

Q: What is the difference between Tape & Reel (TR) and Cut Tape (CT) & Digi-Reel® packaging?

A: Tape & Reel (TR) is a continuous reel format for automated pick-and-place assembly. Cut Tape (CT) & Digi-Reel® provides the same components in cut tape segments with optional reel format. Both formats contain identical components; packaging format selection depends on assembly equipment compatibility and order quantity requirements.

Q: Are there compliance differences between these substitute parts?

A: No. Both parts are ROHS3 compliant, REACH unaffected, and classified as MSL 1 (Unlimited). Regulatory and environmental compliance is identical.

Q: What parameters must remain constant for substitution validity?

A: Zener voltage (56 V), tolerance (±5%), maximum power (3 W), impedance (86 Ohms), reverse leakage current (1 µA @ 42.6 V), forward voltage (1.5 V @ 200 mA), operating temperature range (-65°C to 150°C), and package type (DO-214AA SMB) must all match exactly.

Q: Can these parts be used interchangeably on the same PCB assembly?

A: Yes. Both parts are surface mount components in identical SMB packages with matching pin configurations and electrical characteristics. No PCB layout or assembly process modifications are required.