Equivalent & Substitute Parts Reference – SMBJ5945A/TR13

Part Overview

SMBJ5945A/TR13 is a Zener diode manufactured by Microchip Technology in the Diodes, Zener category. It features a nominal 68 V Zener voltage, 2 W maximum power dissipation, and ±10% tolerance. The part is supplied in DO-214AA, SMB surface mount packaging and supports operating temperatures from -65°C to 150°C. Finding alternative models is required when the original component is unavailable, when inventory requirements are not met, or when compliance (RoHS status) or qualification standards need to be evaluated for application-specific demands.

Key Parameters

Parameter	SMBJ5945A/TR13
Manufacturer Part Number	SMBJ5945A/TR13
Manufacturer	Microchip Technology
Category	Diodes, Zener
Voltage - Zener (Nom) (Vz)	68 V
Tolerance	±10%
Power - Max	2 W
Impedance (Max) (Zzt)	120 Ohms
Current - Reverse Leakage @ Vr	1 µA @ 51.2 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
Product Status	Active

Substitute Part Grouping Explanation

Substitute candidates are selected strictly based on electrical and mechanical key parameters:

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

All listed substitutes (1SMB5945BT3G, SZ1SMB5945BT3G) match the critical Zener voltage, package, operating temperature, mounting style, and impedance. Differences in power rating and tolerance are explicitly indicated, aligning selection only with provided values.

Parameter Comparison

Parameter	SMBJ5945A/TR13	1SMB5945BT3G	SZ1SMB5945BT3G
Manufacturer	Microchip Technology	onsemi	onsemi
Category	Diodes, Zener	Diodes, Zener	Diodes, Zener
Voltage - Zener (Nom) (Vz)	68 V	68 V	68 V
Tolerance	±10%	±5%	±5%
Power - Max	2 W	3 W	3 W
Impedance (Max) (Zzt)	120 Ohms	120 Ohms	120 Ohms
Current - Reverse Leakage @ Vr	1 µA @ 51.2 V	1 µA @ 51.7 V	1 µA @ 51.7 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
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected
Product Status	Active	Active	Active

Engineering Selection Recommendations

Selection between SMBJ5945A/TR13, 1SMB5945BT3G, and SZ1SMB5945BT3G is based on product status, RoHS compliance, and certification details as provided. All parts are active. The substitute parts 1SMB5945BT3G and SZ1SMB5945BT3G are ROHS3 compliant, while SMBJ5945A/TR13 is RoHS non-compliant. SZ1SMB5945BT3G offers AEC-Q101 automotive qualification. All share MSL 1 (Unlimited) and REACH unaffected status.

Frequently Asked Questions (FAQ)

Q1: What key parameters determine substitute suitability for SMBJ5945A/TR13 in the Diodes, Zener category?
A1: Substitute suitability is strictly determined by nominal Zener voltage (68 V), package (DO-214AA, SMB), power rating, tolerance, impedance, reverse leakage current at specified voltage, forward voltage at specified current, operating temperature, mounting type, RoHS status, and product status.

Q2: Are there differences in package compatibility among substitutes?
A2: No, all substitutes use the DO-214AA, SMB surface mount package, ensuring footprint compatibility.

Q3: Why is RoHS status relevant when selecting substitutes?
A3: RoHS status is relevant for compliance with environmental and market regulations. 1SMB5945BT3G and SZ1SMB5945BT3G are ROHS3 compliant, while SMBJ5945A/TR13 is RoHS non-compliant.

Q4: What should be considered for applications requiring automotive qualification?
A4: SZ1SMB5945BT3G provides AEC-Q101 automotive qualification, as specified.

Q5: Are differences in tolerance or power rating significant among these substitutes?
A5: Tolerance is ±10% for SMBJ5945A/TR13 and ±5% for 1SMB5945BT3G and SZ1SMB5945BT3G. Power rating is 2 W for SMBJ5945A/TR13 and 3 W for substitutes; selection is governed strictly by the provided parameters.

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