3SMBJ5939B-TP Equivalent & Substitute Parts

Part Overview

The 3SMBJ5939B-TP is a Zener diode manufactured by Micro Commercial Co, rated for 39 V nominal voltage and 3 W maximum power dissipation in a surface mount DO-214AA (SMB) package. This component is classified as an active product with full RoHS3 compliance and unlimited moisture sensitivity rating. Equivalent and substitute parts are identified to provide design flexibility, supply chain alternatives, and procurement options while maintaining electrical and mechanical compatibility within specified parameter tolerances.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	39	V
Tolerance	±5%	%
Power - Max	3	W
Impedance (Max)	45	Ohms
Current - Reverse Leakage @ Vr	1	µA @ 29.7 V
Voltage - Forward (Max) @ If	1.5	V @ 200 mA
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	DO-214AA, SMB	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the 3SMBJ5939B-TP are identified based on electrical parameter equivalence and mechanical compatibility. The substitution criteria are strictly defined by the following parameters:

Nominal Zener Voltage: 39 V (with ±5% tolerance band)
Maximum Power Dissipation: 3 W
Maximum Impedance: 45 Ohms
Reverse Leakage Current: 1 µA @ 29.7 V
Forward Voltage: 1.5 V @ 200 mA
Package Type: DO-214AA / SMB surface mount
Compliance: RoHS3 compliant, REACH unaffected
Moisture Sensitivity: MSL 1 (Unlimited)

Parts meeting all electrical specifications and package requirements within these defined parameters are classified as direct substitutes. Packaging format variations (Tape & Reel versus Cut Tape & Digi-Reel) do not affect electrical equivalence.

Parameter Comparison

Parameter	3SMBJ5939B-TP (Micro Commercial Co)	1SMB5939BT3G (onsemi)	Match Status
Voltage - Zener (Nom)	39 V	39 V	Equivalent
Tolerance	±5%	±5%	Equivalent
Power - Max	3 W	3 W	Equivalent
Impedance (Max)	45 Ohms	45 Ohms	Equivalent
Current - Reverse Leakage @ Vr	1 µA @ 29.7 V	1 µA @ 29.7 V	Equivalent
Voltage - Forward (Max) @ If	1.5 V @ 200 mA	1.5 V @ 200 mA	Equivalent
Operating Temperature Range	-55°C ~ 150°C	-65°C ~ 150°C	Substitute exceeds specification
Mounting Type	Surface Mount	Surface Mount	Equivalent
Package / Case	DO-214AA, SMB	DO-214AA, SMB	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Equivalent

Engineering Selection Recommendations

The 1SMB5939BT3G manufactured by onsemi is a direct electrical and mechanical substitute for the 3SMBJ5939B-TP. Both components share identical electrical specifications across all critical parameters: nominal zener voltage, power rating, impedance, leakage current, and forward voltage characteristics. Both are packaged in DO-214AA (SMB) surface mount format and carry equivalent RoHS3 compliance and MSL 1 ratings.

The substitute part demonstrates an extended lower operating temperature limit (-65°C versus -55°C), which provides additional thermal margin in applications requiring operation at lower ambient temperatures. This extended range does not create incompatibility; it represents an enhancement to the original specification.

Selection between these parts is determined by availability, packaging format preference (Tape & Reel versus Cut Tape & Digi-Reel), lead time, and procurement requirements. Both parts are active products with confirmed inventory and full compliance documentation.

Frequently Asked Questions (FAQ)

Q: Can the 1SMB5939BT3G replace the 3SMBJ5939B-TP in existing designs?

A: Yes. Both components meet identical electrical specifications for zener voltage (39 V ±5%), power dissipation (3 W), impedance (45 Ohms maximum), and all other critical parameters. The DO-214AA (SMB) package footprint is identical, enabling direct PCB substitution without layout modification.

Q: What is the difference between Tape & Reel and Cut Tape & Digi-Reel packaging?

A: Tape & Reel (TR) and Cut Tape & Digi-Reel (CT) are packaging and delivery formats that do not affect component electrical performance or physical dimensions. Tape & Reel is supplied on continuous carrier tape for automated assembly. Cut Tape & Digi-Reel is supplied in shorter tape segments or alternative reel formats. Selection depends on production volume and assembly equipment compatibility.

Q: Are there temperature range differences between these parts?

A: The 1SMB5939BT3G operates from -65°C to 150°C, while the 3SMBJ5939B-TP operates from -55°C to 150°C. The substitute part has a lower minimum temperature specification, providing extended operating range. This does not create incompatibility for applications within the original -55°C to 150°C range.

Q: Do both parts carry the same compliance certifications?

A: Yes. Both the 3SMBJ5939B-TP and 1SMB5939BT3G are RoHS3 compliant, REACH unaffected, and carry MSL 1 (Unlimited) moisture sensitivity ratings. Compliance documentation is equivalent for both parts.

Q: What parameters determine substitution eligibility for 39 V Zener diodes in SMB packages?

A: Substitution eligibility is determined by: nominal zener voltage (39 V ±5%), maximum power dissipation (3 W), maximum impedance (45 Ohms), reverse leakage current (1 µA @ 29.7 V), forward voltage (1.5 V @ 200 mA), DO-214AA (SMB) package format, and compliance status (RoHS3, MSL 1). All parameters must match or exceed the original specification.

Q: Can these parts be used interchangeably in high-reliability applications?

A: Both parts are active products with full compliance certifications and equivalent electrical specifications. Interchangeability in high-reliability applications is determined by design qualification requirements, procurement specifications, and quality assurance protocols specific to the application. Component selection should follow established design control and supplier approval procedures.

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