SMBJ5946CE3/TR13 Equivalent & Substitute Parts

Part Overview

The SMBJ5946CE3/TR13 is a Zener diode rated at 75 V nominal with 2 W maximum power dissipation, manufactured by Microchip Technology. This component is a surface mount device in the DO-214AA (SMB) package, designed for voltage regulation and transient protection applications. The part is currently Active in product status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Substitute parts are identified to provide design flexibility when the primary part is unavailable, when inventory constraints exist, or when application requirements permit operation within the specified parameter tolerances of alternative qualified components.

Substiute Parts

SMBJ5946CE3/TR13

Microchip TechnologyIn Stock: 1101SMBJ5946CE3/TR13 Datasheet

Current PartRFQ

1SMB5946B-13

Diodes IncorporatedIn Stock: 61761SMB5946B-13 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMBJ5946CE3/TR13 is determined by the following critical parameters:

Primary Substitution Criteria:

• Zener voltage nominal rating: 75 V (exact match required)
• Package / Case: DO-214AA or SMB (mechanical and thermal compatibility)
• Mounting type: Surface Mount (PCB assembly compatibility)
• Operating temperature range: -65°C to 150°C minimum (thermal envelope)
• Impedance (Maximum): 140 Ohms (circuit performance parameter)
• Reverse leakage current: 1 µA @ 56 V (leakage specification)

Secondary Tolerance Parameters:

• Power rating: Substitute parts with equal or greater maximum power dissipation are acceptable
• Voltage tolerance: Substitute parts with wider tolerance (±5%) are acceptable for applications not requiring ±2% precision
• Forward voltage: Substitute parts with higher forward voltage drop are acceptable within circuit design margins

The substitute part 1SMB5946B-13 meets all primary criteria and maintains compatibility across all mechanical, thermal, and electrical parameters while offering increased power dissipation capability.

Parameter Comparison

Engineering Selection Recommendations

SMBJ5946CE3/TR13 (Primary Selection)

Select this part when:

• Design specifications require ±2% voltage tolerance
• Forward voltage drop must not exceed 1.2 V @ 200 mA
• Power dissipation is limited to 2 W maximum
• Microchip Technology supply chain is preferred or established

This part maintains Active product status with full RoHS3 compliance and REACH unaffected designation, ensuring long-term availability and regulatory compliance.

1SMB5946B-13 (Substitute Selection)

Select this part when:

• SMBJ5946CE3/TR13 is unavailable or on extended lead time
• Application design permits ±5% voltage tolerance
• Higher power dissipation capability (3 W) provides thermal margin
• Forward voltage drop of 1.5 V @ 200 mA is acceptable within circuit design parameters
• Diodes Incorporated supply chain is preferred or established

This part maintains Active product status with full RoHS3 compliance and REACH unaffected designation. The increased power rating provides additional thermal headroom for transient protection applications.

Both parts are mechanically and thermally interchangeable in DO-214AA (SMB) surface mount applications with identical operating temperature ranges and moisture sensitivity ratings.

Frequently Asked Questions (FAQ)

Q: Can the 1SMB5946B-13 directly replace the SMBJ5946CE3/TR13 in all applications?

A: Direct replacement is possible when the application design permits ±5% voltage tolerance and 1.5 V forward voltage drop. The substitute part's higher power rating (3 W vs. 2 W) provides additional thermal capability. Verify that circuit design margins accommodate the wider tolerance and higher forward voltage before implementation.

Q: What is the significance of the ±2% tolerance on the SMBJ5946CE3/TR13?

A: The ±2% tolerance specifies the precision of the 75 V zener voltage nominal rating. This tighter tolerance ensures the zener voltage remains between 73.5 V and 76.5 V. Applications requiring precise voltage regulation benefit from this specification. The substitute part's ±5% tolerance permits zener voltage between 71.25 V and 78.75 V, which may be unsuitable for precision voltage reference circuits.

Q: Are the DO-214AA and SMB package designations equivalent?

A: Yes. DO-214AA and SMB are equivalent package designations for the same physical form factor. Both parts use this identical surface mount package, ensuring mechanical compatibility on PCB layouts and reflow soldering processes.

Q: What does Moisture Sensitivity Level 1 (Unlimited) mean?

A: MSL 1 indicates the component has unlimited shelf life without moisture bake-out requirements. Both the primary part and substitute part carry this rating, eliminating moisture-related handling constraints during storage and assembly.

Q: How do the impedance specifications affect substitution?

A: Both parts specify 140 Ohms maximum impedance at the zener voltage. This parameter defines the dynamic resistance of the diode and directly affects voltage regulation performance. The exact match ensures equivalent circuit behavior in voltage regulation and transient suppression applications.

Q: What is the impact of the 0.3 V difference in forward voltage between the two parts?

A: The SMBJ5946CE3/TR13 specifies 1.2 V maximum forward voltage, while the 1SMB5946B-13 specifies 1.5 V maximum. In forward-biased applications, this 0.3 V difference affects power dissipation and heat generation. Verify that circuit design accommodates this difference, particularly in high-current forward-bias scenarios.

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

A: Yes. Both parts are ROHS3 compliant, REACH unaffected, and carry identical ECCN (EAR99) and HTSUS (8541.10.0050) classifications. Regulatory and export compliance requirements are satisfied by either part.

Q: What is the reverse leakage current specification used for?

A: The 1 µA @ 56 V reverse leakage specification defines the maximum leakage current when the diode is reverse-biased below the zener voltage. Both parts specify identical leakage, ensuring equivalent performance in standby and off-state conditions. Lower leakage current improves circuit efficiency and reduces power consumption in voltage regulation applications.