SMBJ5370A/TR13 Equivalent & Substitute Parts

Part Overview

The SMBJ5370A/TR13 is a Zener diode rated at 56 V nominal voltage with 5 W maximum power dissipation, manufactured by Microchip Technology. This surface mount component operates across a temperature range of -65°C to 150°C and is supplied in tape and reel packaging with DO-214AA (SMB) case format. The part is currently active in production with 1037 pieces available in inventory. Equivalent and substitute parts are identified to support design flexibility, supply chain continuity, and application-specific requirements where alternative electrical or compliance characteristics are acceptable.

Substiute Parts

SMBJ5370A/TR13

Microchip TechnologyIn Stock: 1128SMBJ5370A/TR13 Datasheet

Current PartRFQ

SZ1SMB5943BT3G

onsemiIn Stock: 2825SZ1SMB5943BT3G Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMBJ5370A/TR13 is determined by the following critical parameters:

Primary Matching Criteria:

• Zener voltage (Nom): 56 V
• Package / Case: DO-214AA, SMB (surface mount)
• Operating temperature range: -65°C to 150°C
• Mounting type: Surface Mount

Secondary Compatibility Factors:

• Power dissipation rating (5 W nominal)
• Voltage tolerance (±10%)
• Impedance characteristics (35 Ohms max)
• Reverse leakage current specifications

The substitute part SZ1SMB5943BT3G matches the primary criteria of 56 V zener voltage and DO-214AA/SMB package format. However, this substitute exhibits differences in power rating (3 W versus 5 W), voltage tolerance (±5% versus ±10%), impedance (86 Ohms versus 35 Ohms), and reverse leakage characteristics. These differences establish the substitute as functionally equivalent for 56 V zener applications within the SMB package family, subject to circuit-level power dissipation requirements.

Parameter Comparison

Engineering Selection Recommendations

SMBJ5370A/TR13 (Microchip Technology): Select this part for applications requiring the specified 5 W power dissipation rating and ±10% voltage tolerance. This component is active in production with established inventory availability. The part is RoHS non-compliant and carries no automotive qualification.

SZ1SMB5943BT3G (onsemi): This substitute is suitable for 56 V zener applications where the 3 W power rating is sufficient for circuit requirements. The substitute offers tighter voltage tolerance (±5%), ROHS3 compliance, and AEC-Q101 automotive qualification. The higher impedance (86 Ohms) and increased reverse leakage current must be evaluated against circuit specifications. This part is appropriate for applications requiring automotive-grade components or RoHS compliance.

Selection between these parts depends on circuit power dissipation requirements, compliance mandates, and tolerance specifications. Both parts share identical zener voltage and package format, establishing functional equivalence within their respective electrical parameter ranges.

Frequently Asked Questions (FAQ)

Q: Can SZ1SMB5943BT3G directly replace SMBJ5370A/TR13 in all applications?

A: Direct replacement is possible only when circuit power dissipation does not exceed 3 W. The substitute part has a lower maximum power rating (3 W versus 5 W). Verify that your circuit design operates within the 3 W limit before substitution. Both parts share the same 56 V zener voltage and DO-214AA/SMB package format.

Q: What is the significance of the ±5% versus ±10% voltage tolerance difference?

A: The substitute part (SZ1SMB5943BT3G) provides tighter voltage tolerance at ±5%, compared to the main part's ±10%. Tighter tolerance means the zener voltage will remain closer to the 56 V nominal specification across the production range. Applications requiring precise voltage regulation benefit from the substitute's tighter tolerance.

Q: Does the impedance difference affect circuit performance?

A: The substitute part exhibits higher impedance (86 Ohms versus 35 Ohms). Impedance affects the zener diode's dynamic response to load changes. Circuits sensitive to transient response or requiring low output impedance should retain the main part. General voltage regulation applications typically tolerate the impedance difference.

Q: Is the substitute part suitable for automotive applications?

A: Yes. The SZ1SMB5943BT3G carries AEC-Q101 automotive qualification, making it suitable for automotive-grade designs. The main part (SMBJ5370A/TR13) has no automotive qualification listed.

Q: What is the impact of RoHS compliance on part selection?

A: The main part is RoHS non-compliant, while the substitute is ROHS3 compliant. If your design or supply chain requires RoHS compliance, the substitute part is the appropriate selection. Both parts are otherwise equivalent in function and package format.

Q: Are both parts available in the same packaging format?

A: Yes. Both SMBJ5370A/TR13 and SZ1SMB5943BT3G use DO-214AA (SMB) surface mount package format and are supplied in tape and reel (TR) configuration. No PCB layout or assembly process changes are required for substitution.

Q: What is the reverse leakage current difference, and does it matter?

A: The main part specifies 500 nA @ 40.3 V, while the substitute specifies 1 µA @ 42.6 V. The substitute exhibits higher reverse leakage. In low-current applications or circuits with high impedance paths, this difference may affect performance. Evaluate circuit requirements for leakage sensitivity before substitution.