3SMBJ5940B-TP Equivalent & Substitute Parts

Part Overview

The 3SMBJ5940B-TP is an active Zener diode manufactured by Micro Commercial Co, rated at 43 V nominal voltage with 3 W maximum power dissipation in a surface mount DO-214AA (SMB) package. This component is supplied in Tape & Reel packaging and maintains 658 units in current inventory stock. Zener diodes of this specification are used in voltage regulation, overvoltage protection, and reference voltage applications across industrial and commercial electronics. Identifying equivalent substitute parts ensures design flexibility, supply chain continuity, and access to alternative inventory sources when the primary part becomes unavailable.

Substiute Parts

3SMBJ5940B-TP

Micro Commercial CoIn Stock: 6863SMBJ5940B-TP Datasheet

Current PartRFQ

1SMB5940BT3G

onsemiIn Stock: 117561SMB5940BT3G Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 3SMBJ5940B-TP are identified based on electrical and mechanical parameter equivalence. The critical parameters that determine substitutability are:

• Zener Voltage (Nominal): 43 V
• Power Rating: 3 W
• Tolerance: ±5%
• Impedance (Maximum): 53 Ohms
• Reverse Leakage Current: 1 µA @ 32.7 V
• Forward Voltage: 1.5 V @ 200 mA
• Package Type: DO-214AA / SMB surface mount
• Compliance: ROHS3 Compliant, REACH Unaffected

Parts meeting all these electrical specifications and physical package requirements are classified as direct substitutes. The 1SMB5940BT3G from onsemi satisfies all substitution criteria and is therefore listed as an equivalent part.

Parameter Comparison

Engineering Selection Recommendations

The 1SMB5940BT3G from onsemi is a direct electrical and mechanical equivalent to the 3SMBJ5940B-TP. Both parts are active products with identical zener voltage, power rating, impedance, and leakage characteristics. Both maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for industrial and commercial applications.

The onsemi substitute provides an extended lower operating temperature limit of -65°C compared to the -55°C minimum of the Micro Commercial Co part, offering broader thermal operating range capability. Both parts are supplied in identical DO-214AA (SMB) surface mount packages with unlimited moisture sensitivity classification, ensuring direct PCB footprint compatibility and assembly process compatibility.

Selection between these parts should be based on availability, lead time, pricing, and supply chain requirements. Both parts are suitable for voltage regulation, overvoltage protection, and reference voltage circuit applications requiring 43 V zener specifications.

Frequently Asked Questions (FAQ)

Q: Can the 1SMB5940BT3G replace the 3SMBJ5940B-TP in existing designs?

A: Yes. The 1SMB5940BT3G is electrically and mechanically equivalent. All critical parameters including zener voltage, power rating, impedance, leakage current, and forward voltage are identical. Both parts use the same DO-214AA (SMB) surface mount package, ensuring direct PCB compatibility without layout modifications.

Q: Are there differences in operating temperature ranges between these parts?

A: The 1SMB5940BT3G operates from -65°C to 150°C, while the 3SMBJ5940B-TP operates from -55°C to 150°C. The onsemi part provides a 10°C lower minimum operating temperature. For applications operating above -55°C, both parts are functionally equivalent. For applications requiring operation below -55°C, the onsemi substitute provides extended capability.

Q: Do both parts meet the same regulatory compliance standards?

A: Yes. Both the 3SMBJ5940B-TP and 1SMB5940BT3G are ROHS3 compliant and REACH unaffected. Both carry Moisture Sensitivity Level 1 (Unlimited) classification. Regulatory and environmental compliance requirements are satisfied by either part.

Q: What is the significance of the ±5% tolerance specification?

A: The ±5% tolerance indicates that the actual zener voltage will fall within the range of 40.85 V to 45.15 V (43 V ± 5%). Both substitute parts share this tolerance specification, ensuring equivalent voltage regulation performance in circuit applications.

Q: Are the packaging formats identical between these parts?

A: Yes. Both parts are supplied in DO-214AA (SMB) surface mount packages in Tape & Reel format. The physical dimensions, lead configuration, and PCB footprint are identical, enabling direct substitution without assembly process changes.

Q: What parameters must remain constant for substitution to be valid?

A: The following parameters must match for valid substitution: zener voltage (43 V), power rating (3 W), tolerance (±5%), impedance (53 Ohms maximum), reverse leakage current (1 µA @ 32.7 V), forward voltage (1.5 V @ 200 mA), and package type (DO-214AA / SMB). All these parameters are identical between the main part and substitute.