SMBJ5943A/TR13 Zener Diode Equivalent & Substitute Parts Reference

Part Overview

SMBJ5943A/TR13 is a Zener diode manufactured by Microchip Technology, offering a nominal Zener voltage of 56 V and maximum power dissipation of 2 W in a surface-mount DO-214AA (SMBJ) package. It is classified as active and stocked in new, original condition. Identifying alternative models is essential for continuous design, sourcing flexibility, and ensuring RoHS or regulatory compliance when inventory or required certifications fluctuate.

Key Parameters

Manufacturer Part Number	Manufacturer	Category	Voltage - Zener (Nom) (Vz)	Tolerance	Power - Max	Impedance (Max) (Zzt)	Current - Reverse Leakage @ Vr	Voltage - Forward (Vf) (Max) @ If	Operating Temperature	Mounting Type	Package / Case	Supplier Device Package	RoHS Status	Moisture Sensitivity Level (MSL)	REACH Status
SMBJ5943A/TR13	Microchip Technology	Diodes, Zener	56 V	±10%	2 W	86 Ohms	1 µA @ 42.6 V	1.2 V @ 200 mA	-65°C ~ 150°C	Surface Mount	DO-214AA, SMB	SMBJ (DO-214AA)	RoHS non-compliant	1 (Unlimited)	REACH Unaffected

Substitute Part Grouping Explanation

Acceptable substitute parts must precisely match the following parameters: voltage - Zener (nominal), power rating, package type, Zener tolerance, reverse leakage current, Zener impedance, mounting type, and compliance status. SMBJ5943A/TR13 alternatives are grouped according to:

Voltage - Zener (Nom) (Vz)
Tolerance
Power - Max
Impedance (Max) (Zzt)
Current - Reverse Leakage @ Vr
Operating Temperature
Mounting Type
Package / Case
Supplier Device Package
RoHS and REACH Status

Parameter Comparison

Parameter	SMBJ5943A/TR13	SZ1SMB5943BT3G
Manufacturer Part Number	SMBJ5943A/TR13	SZ1SMB5943BT3G
Manufacturer	Microchip Technology	onsemi
Category	Diodes, Zener	Diodes, Zener
Voltage - Zener (Nom) (Vz)	56 V	56 V
Tolerance	±10%	±5%
Power - Max	2 W	3 W
Impedance (Max) (Zzt)	86 Ohms	86 Ohms
Current - Reverse Leakage @ Vr	1 µA @ 42.6 V	1 µA @ 42.6 V
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 200 mA	900 mV @ 10 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
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

Select SZ1SMB5943BT3G for requirements where RoHS compliance is necessary and higher power dissipation (3 W) is acceptable. Both parts are specified as active and surface-mount, within the same temperature range, and available in DO-214AA (SMB) packages. The parts share REACH unaffected status and MSL ratings.

Frequently Asked Questions (FAQ)

Q1: What are the key electrical parameters required for substituting SMBJ5943A/TR13 Zener diodes? A1: Key parameters are Voltage - Zener (Nom), Zener tolerance, Power - Max, Impedance (Max), Reverse Leakage Current, Operating Temperature, Mounting Type, and Package / Case.

Q2: Is SZ1SMB5943BT3G a direct substitute for SMBJ5943A/TR13? A2: SZ1SMB5943BT3G matches the main electrical and mechanical parameters and provides RoHS compliance. Tolerance is tighter (±5%) and maximum power is higher (3 W).

Q3: Do both parts use the same package? A3: Both are in surface mount DO-214AA (SMB) outlines, allowing for pin and PCB footprint compatibility.

Q4: How does RoHS status affect Zener diode selection? A4: SMBJ5943A/TR13 is RoHS non-compliant, while SZ1SMB5943BT3G is ROHS3 compliant. For applications requiring RoHS compliance, use ROHS3 compliant parts.

Q5: Are there differences in high-temperature operation? A5: Both SMBJ5943A/TR13 and SZ1SMB5943BT3G are rated for -65°C to +150°C operation, providing equivalent thermal performance.

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