SMBJ5388B-TP Equivalent & Substitute Parts

Part Overview

The SMBJ5388B-TP is an active-status zener diode manufactured by Micro Commercial Co, rated for 200 V nominal zener voltage with 5 W maximum power dissipation in a surface mount DO-214AA (SMB) package. This component is designed for voltage regulation and transient protection applications requiring surface mount integration. Substitute parts are identified when equivalent electrical performance can be achieved within the specified parameter tolerances while maintaining package compatibility and compliance requirements.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	200	V
Tolerance	±5%	%
Power - Max	5	W
Impedance (Max)	480	Ohms
Current - Reverse Leakage @ Vr	500 nA @ 152 V	nA
Voltage - Forward (Max) @ If	1.2 V @ 1 mA	V
Operating Temperature Range	-55°C to 150°C	°C
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
MSL Rating	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution eligibility for the SMBJ5388B-TP is determined by the following critical parameters:

Primary Matching Criteria:

Zener voltage (Nom): 200 V ±5% tolerance
Package / Case: DO-214AA or SMB compatible
Mounting Type: Surface Mount
RoHS3 Compliance
MSL Rating: 1 (Unlimited)

Secondary Compatibility Factors:

Power rating (maximum dissipation capability)
Impedance characteristics
Reverse leakage current specifications
Forward voltage characteristics
Operating temperature range

The substitute part SZ1SMB5956BT3G meets the primary matching criteria with identical zener voltage, tolerance, package compatibility, and compliance status. Differences in power rating (3 W vs. 5 W) and impedance characteristics represent trade-offs that must be evaluated against specific application requirements.

Parameter Comparison

Parameter	SMBJ5388B-TP (Main)	SZ1SMB5956BT3G (Substitute)	Unit
Manufacturer	Micro Commercial Co	onsemi	—
Voltage - Zener (Nom)	200	200	V
Tolerance	±5%	±5%	%
Power - Max	5	3	W
Impedance (Max)	480	1200	Ohms
Current - Reverse Leakage @ Vr	500 nA @ 152 V	1 µA @ 152 V	nA / µA
Voltage - Forward (Max) @ If	1.2 V @ 1 mA	1.5 V @ 200 mA	V
Operating Temperature Range	-55°C to 150°C	-65°C to 150°C	°C
Package / Case	DO-214AA, SMB	DO-214AA, SMB	—
Mounting Type	Surface Mount	Surface Mount	—
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	—
MSL Rating	1 (Unlimited)	1 (Unlimited)	—
Product Status	Active	Active	—
Qualification	—	AEC-Q101	—

Engineering Selection Recommendations

SMBJ5388B-TP (Primary Selection)

The SMBJ5388B-TP is the specified component with active product status and full compliance to ROHS3 and REACH requirements. This part is suitable for applications requiring the stated 5 W power dissipation capability and 480 Ohm maximum impedance specification.

SZ1SMB5956BT3G (Substitute Selection)

The SZ1SMB5956BT3G is an active-status substitute manufactured by onsemi with identical zener voltage and tolerance specifications. This part carries AEC-Q101 automotive qualification and maintains ROHS3 compliance and unlimited MSL rating. The substitute is applicable in applications where the 3 W power rating and 1200 Ohm impedance characteristics are acceptable within circuit design parameters. The extended operating temperature range (-65°C to 150°C) provides additional thermal margin compared to the primary part.

Both parts are surface mount compatible in DO-214AA (SMB) packages and maintain equivalent moisture sensitivity and regulatory compliance profiles.

Frequently Asked Questions (FAQ)

Q: Can SZ1SMB5956BT3G directly replace SMBJ5388B-TP in all applications?

A: Direct replacement is possible only when the application circuit design accommodates the 3 W power rating (versus 5 W) and 1200 Ohm impedance (versus 480 Ohm). The identical 200 V zener voltage and ±5% tolerance ensure voltage regulation equivalence. Circuit thermal and impedance analysis is required to confirm suitability.

Q: What is the significance of the impedance difference between these parts?

A: Impedance (Zzt) affects the dynamic response of the zener diode during transient voltage events. The SMBJ5388B-TP has lower impedance (480 Ohms), providing faster transient response. The SZ1SMB5956BT3G has higher impedance (1200 Ohms), which may result in slower transient suppression but is acceptable in applications with less stringent transient requirements.

Q: Are both parts suitable for automotive applications?

A: The SZ1SMB5956BT3G carries AEC-Q101 automotive qualification. The SMBJ5388B-TP does not list automotive qualification in the provided specifications. For automotive applications, the SZ1SMB5956BT3G is the qualified option.

Q: What is the difference in reverse leakage current between these parts?

A: The SMBJ5388B-TP specifies 500 nA reverse leakage at 152 V, while the SZ1SMB5956BT3G specifies 1 µA (1000 nA) at the same voltage. Lower leakage current in the primary part may be advantageous in low-power or precision applications where leakage contributes to circuit performance.

Q: Are the package dimensions identical between these parts?

A: Both parts use the DO-214AA (SMB) surface mount package. Package dimensions and PCB footprints are equivalent, allowing direct physical substitution on the circuit board.

Q: What compliance certifications apply to both parts?

A: Both SMBJ5388B-TP and SZ1SMB5956BT3G are ROHS3 compliant, REACH unaffected, and carry unlimited MSL (Moisture Sensitivity Level 1) ratings. Both are classified under ECCN EAR99 and HTSUS 8541.10.0050.

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