SMBJ5946A/TR13 Equivalent & Substitute Parts Reference

Part Overview

The SMBJ5946A/TR13 by Microchip Technology is a Zener diode designed for voltage regulation with a nominal voltage of 75 V, 2 W maximum power dissipation, and surface mount placement using the SMBJ (DO-214AA) package. The product is RoHS non-compliant and maintains an active status with inventory available. Identifying alternative models is necessary for ensuring supply continuity, addressing compliance needs, or adjusting to sourcing constraints, especially given varying availability and environmental criteria.

Key Parameters

Parameter	SMBJ5946A/TR13
Manufacturer	Microchip Technology
Part Category	Diodes, Zener
Voltage - Zener (Nom) (Vz)	75 V
Tolerance	±10%
Power - Max	2 W
Impedance (Max) (Zzt)	140 Ohms
Current - Reverse Leakage @ Vr	1 µA @ 56 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
MSL	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts are determined based on identical or stricter electrical and mechanical parameters. The critical parameters considered are: category (Diodes, Zener), Voltage - Zener (Nom) (Vz), Power - Max, Impedance (Max) (Zzt), Current - Reverse Leakage, Voltage - Forward (Vf) (Max), Tolerance, Operating Temperature, Mounting Type, Package / Case, and environmental compliance (RoHS Status, MSL). Exact package compatibility and equivalent or better electrical ratings are required for substitute eligibility.

Parameter Comparison

Parameter	SMBJ5946A/TR13 (Microchip Technology)	SZ1SMB5946BT3G (onsemi)
Category	Diodes, Zener	Diodes, Zener
Voltage - Zener (Nom) (Vz)	75 V	75 V
Tolerance	±10%	±5%
Power - Max	2 W	3 W
Impedance (Max) (Zzt)	140 Ohms	140 Ohms
Current - Reverse Leakage @ Vr	1 µA @ 56 V	1 µA @ 56 V
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 200 mA	1.5 V @ 200 mA
Operating Temperature	-65°C ~ 150°C	-65°C ~ 150°C
Mounting Type	Surface Mount	Surface Mount
Package / Case	DO-214AA, SMB	DO-214AA, SMB
Supplier Device Package	SMBJ (DO-214AA)	SMB
RoHS Status	RoHS non-compliant	ROHS3 Compliant
MSL	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

All substitute selections must match or exceed the main part in product status, compliance, and provided certifications. SZ1SMB5946BT3G is listed as active, automotive grade (AEC-Q101), and ROHS3 compliant, while SMBJ5946A/TR13 is RoHS non-compliant. Moisture Sensitivity Level is equivalent in both parts. If RoHS compliance is required, SZ1SMB5946BT3G fulfills this criterion; if legacy environmental status is necessary, SMBJ5946A/TR13 must be used accordingly.

Frequently Asked Questions (FAQ)

Q: What key parameters must be matched when substituting SMBJ5946A/TR13?
A: The substitute must match or exceed Voltage - Zener (Nom) (75 V), Power - Max (2 W or higher), Impedance (Max), Current - Reverse Leakage, Voltage - Forward (Vf) (Max), Tolerance, Operating Temperature, and have the same package (DO-214AA, SMB).

Q: Does SZ1SMB5946BT3G have compatible mechanical and electrical properties?
A: Yes. SZ1SMB5946BT3G matches Voltage - Zener (75 V), Impedance (Max), Operating Temperature, Mounting Type, and Package / Case, with higher Power - Max (3 W) and improved tolerance (±5%).

Q: Is there any difference in RoHS compliance?
A: SMBJ5946A/TR13 is RoHS non-compliant. SZ1SMB5946BT3G is ROHS3 compliant.

Q: Do both parts fit the same PCB footprint?
A: Both use DO-214AA, SMB surface-mount package, confirming compatibility with the same PCB footprint.

Q: Are there differences in Moisture Sensitivity Level (MSL)?
A: Both have Moisture Sensitivity Level 1 (Unlimited).

Q: What operating temperature range is supported by both parts?
A: Both operate between -65°C and 150°C.

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