Equivalent & Substitute Parts for Microchip Technology SMBJ4757/TR13

Part Overview

The Microchip Technology SMBJ4757/TR13 is a Zener diode designed for voltage regulation and protection applications. It provides nominal 51 V Zener voltage at 2 W maximum power dissipation with ±10% tolerance. As an active product in the "Diodes, Zener" category, it is supplied in the SMBJ (DO-214AA) surface-mount package. Sourcing alternative or equivalent models is necessary to address factors such as supply continuity, regulatory compliance (e.g., RoHS), and any other procurement considerations.

Key Parameters

Parameter	Main Part (SMBJ4757/TR13)
Voltage - Zener (Nom) (Vz)	51 V
Tolerance	±10%
Power - Max	2 W
Impedance (Max) (Zzt)	95 Ohms
Current - Reverse Leakage @ Vr	5 µA @ 38.8 V
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 200 mA
Operating Temperature	-65°C ~ 150°C
Mounting Type	Surface Mount
Package / Case	DO-214AA, SMB
Supplier Device Package	SMBJ (DO-214AA)
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Unaffected
ECCN	EAR99

Substitute Part Grouping Explanation

Substitution within the "Diodes, Zener" category is determined strictly by matching or exceeding the following parameters:

Nominal Zener Voltage (Vz): 51 V
Power Dissipation: 2 W or greater
Tolerance: ±10% or tighter
Surface-mount package type: DO-214AA, SMB or direct equivalents
Reverse leakage current at test voltage must not exceed the main part value
Maximum Zener impedance not to exceed the main part value
Operating temperature range must be at least as wide as the original part

Only parts meeting all these specifications are considered valid substitutes for SMBJ4757/TR13.

Parameter Comparison

Parameter	SMBJ4757/TR13	1SMB5942BT3G	SZ1SMB5942BT3G
Manufacturer	Microchip Technology	onsemi	onsemi
Voltage - Zener (Nom) (Vz)	51 V	51 V	51 V
Tolerance	±10%	±5%	±5%
Power - Max	2 W	3 W	3 W
Impedance (Max) (Zzt)	95 Ohms	70 Ohms	70 Ohms
Current - Reverse Leakage @ Vr	5 µA @ 38.8 V	1 µA @ 38.8 V	1 µA @ 38.8 V
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 200 mA	1.5 V @ 200 mA	900 mV @ 10 mA
Operating Temperature	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
MSL	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected
ECCN	EAR99	EAR99	EAR99

Engineering Selection Recommendations

When selecting substitutes, only parts with "Active" product status and compatible environmental compliance profiles (such as RoHS and REACH) are considered. Both 1SMB5942BT3G (onsemi) and SZ1SMB5942BT3G (onsemi) offer ROHS3 compliance and maintain REACH unaffected status. These substitutes are currently active in inventory and match or exceed the original electrical and mechanical parameters.

Frequently Asked Questions (FAQ)

Q1: What defines a valid equivalent or substitute for the SMBJ4757/TR13 Zener diode?
A1: Valid equivalents must strictly match or exceed the nominal Zener voltage, power rating, voltage tolerance, maximum impedance, leakage current, package type (DO-214AA, SMB), and operating temperature range.

Q2: Can these substitutes be used in place of the main part without changing the PCB footprint?
A2: All parts listed utilize the DO-214AA (SMB) surface mount package, ensuring mechanical compatibility.

Q3: What role does RoHS status play in substitute selection?
A3: Substitutes with ROHS3 compliance may be required for applications subject to environmental regulations; the original part is RoHS non-compliant.

Q4: Are there any differences in electrical performance among substitutes?
A4: Substitute parts listed match or improve upon the main parameters: tighter voltage tolerance, lower impedance, lower leakage current, and higher or equal power rating.

Q5: Do all listed substitutes have the same moisture sensitivity?
A5: All parts have Moisture Sensitivity Level (MSL) 1 (Unlimited), suitable for all standard assembly processes.

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