SMBJ5931A/TR13 Equivalent & Substitute Parts Reference

Part Overview

The SMBJ5931A/TR13 by Microchip Technology is a surface-mount Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 18 V, a maximum power dissipation of 2 W, and is enclosed in an SMBJ (DO-214AA) package. The product is currently active. Identifying compatible substitute parts is critical to maintain design flexibility, address supply chain disruptions, or manage compliance changes.

Key Parameters

Parameter	SMBJ5931A/TR13
Voltage - Zener (Nom) (Vz)	18 V
Tolerance	±10%
Power - Max	2 W
Impedance (Max) (Zzt)	12 Ohms
Current - Reverse Leakage @ Vr	1 µA @ 13.7 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
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitute parts for the SMBJ5931A/TR13 are identified strictly by matching the allowed key parameters: Zener voltage (18 V), Zener impedance (12 Ohms max), maximum reverse leakage (1 µA @ 13.7 V), mounting type (surface mount), package (DO-214AA, SMB), and equivalent or better power rating (≥2 W). Tolerance, voltage forward at specified current, and operating temperature ranges are also matched or exceeded. Product status must be active.

Parameter Comparison

Parameter	SMBJ5931A/TR13	1SMB5931BT3G	SZ1SMB5931BT3G
Manufacturer	Microchip Technology	onsemi	onsemi
Voltage - Zener (Nom) (Vz)	18 V	18 V	18 V
Tolerance	±10%	±5%	±5%
Power - Max	2 W	3 W	3 W
Impedance (Max) (Zzt)	12 Ohms	12 Ohms	12 Ohms
Current - Reverse Leakage @ Vr	1 µA @ 13.7 V	1 µA @ 13.7 V	1 µA @ 13.7 V
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 200 mA	1.5 V @ 200 mA	1.5 V @ 200 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
Supplier Device Package	SMBJ (DO-214AA)	SMB	SMB
Product Status	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

The main part, SMBJ5931A/TR13, is RoHS non-compliant, while both substitute parts (1SMB5931BT3G and SZ1SMB5931BT3G) are ROHS3 compliant. All compared parts feature an active status and unaffected REACH status. Both substitutes meet or exceed the electrical and mechanical criteria provided for this category. The SZ1SMB5931BT3G also offers AEC-Q101 automotive qualification.

Frequently Asked Questions (FAQ)

Q: What parameters determine if a Zener diode can be used as a substitute?
A: Substitution is determined by matching Zener voltage, power rating, impedance, reverse leakage current, package type, mounting method, tolerance, and operating temperature.

Q: Can the tolerance difference affect substitution?
A: The listed substitutes have tighter tolerance (±5%) compared to the main part (±10%) and are therefore within the required range.

Q: Are mechanical package and mounting type critical in substitution?
A: Yes, only surface-mount Zener diodes in DO-214AA, SMB packages are considered equivalent.

Q: Can RoHS status affect part selection?
A: RoHS status may dictate component selection for compliant designs. Substitute parts 1SMB5931BT3G and SZ1SMB5931BT3G are ROHS3 compliant.

Q: Do the substitute parts provide the same or higher power rating?
A: Yes, both substitute parts offer a higher power rating (3 W) compared to the main part (2 W).

Q: Is the automotive grade qualification provided for any substitute?
A: The SZ1SMB5931BT3G is AEC-Q101 automotive qualified.

Q: Are all parts in the comparison currently active?
A: Yes, all parts are listed with active product status.

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