1SMB5944B-13 Equivalent & Substitute Parts

Part Overview

The 1SMB5944B-13 is a Zener diode rated at 62 V nominal voltage with 3 W maximum power dissipation, manufactured by Diodes Incorporated. This surface mount component operates across the temperature range of -65°C to 150°C and is packaged in the DO-214AA (SMB) form factor. The part is currently in active production status with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Substitute parts are identified when equivalent electrical and mechanical parameters are required for design flexibility, inventory management, or supply chain continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	62	V
Tolerance	±5	%
Power - Max	3	W
Impedance (Max)	100	Ohms
Current - Reverse Leakage @ Vr	1	µA @ 47.1 V
Voltage - Forward (Vf) (Max) @ If	1.5	V @ 200 mA
Operating Temperature Range	-65 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	DO-214AA, SMB	—
RoHS Status	ROHS3 Compliant	—
MSL Rating	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the 1SMB5944B-13 are qualified based on matching the following critical electrical and mechanical parameters:

Zener voltage: 62 V nominal
Power rating: 3 W maximum
Voltage tolerance: ±5%
Impedance (Max): 100 Ohms
Reverse leakage current: 1 µA @ 47.1 V
Forward voltage: 1.5 V @ 200 mA
Operating temperature range: -65°C to 150°C
Package type: DO-214AA (SMB)
Mounting configuration: Surface Mount
Compliance: ROHS3, MSL 1

All substitute parts listed maintain identical electrical specifications and mechanical compatibility with the primary part number. Substitutes are differentiated by manufacturer and, in one case, by automotive-grade qualification.

Parameter Comparison

Parameter	1SMB5944B-13 (Diodes Inc.)	1SMB5944BT3G (onsemi)	SZ1SMB5944BT3G (onsemi)
Voltage - Zener (Nom)	62 V	62 V	62 V
Tolerance	±5%	±5%	±5%
Power - Max	3 W	3 W	3 W
Impedance (Max)	100 Ohms	100 Ohms	100 Ohms
Current - Reverse Leakage @ Vr	1 µA @ 47.1 V	1 µA @ 47.1 V	1 µA @ 47.1 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA	1.5 V @ 200 mA	1.5 V @ 200 mA
Operating Temperature Range	-65°C to 150°C	-65°C to 150°C	-65°C to 150°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active
Automotive Grade	—	—	AEC-Q101

Engineering Selection Recommendations

All three part numbers are active production components with full ROHS3 compliance and MSL 1 rating. The 1SMB5944B-13 (Diodes Incorporated) and 1SMB5944BT3G (onsemi) are functionally equivalent for general-purpose applications. The SZ1SMB5944BT3G variant from onsemi carries AEC-Q101 automotive qualification, making it suitable for applications requiring automotive-grade component certification.

Selection between the standard and automotive-qualified variants depends on application requirements. All three parts share identical electrical performance, thermal operating range, and mechanical compatibility. Inventory availability and supply chain considerations may influence part selection among the three options.

Frequently Asked Questions (FAQ)

Q: Can the 1SMB5944BT3G substitute for the 1SMB5944B-13 in existing designs?

A: Yes. Both parts are parametrically equivalent with identical zener voltage (62 V), power rating (3 W), impedance, leakage current, forward voltage, and operating temperature range. The DO-214AA (SMB) package is identical, enabling direct substitution without circuit modification.

Q: What is the difference between 1SMB5944BT3G and SZ1SMB5944BT3G?

A: Both are manufactured by onsemi with identical electrical and mechanical specifications. The SZ1SMB5944BT3G carries AEC-Q101 automotive qualification. Selection depends on whether automotive-grade certification is required for the application.

Q: Are all three parts suitable for the same PCB layout?

A: Yes. All three parts use the DO-214AA (SMB) surface mount package with identical footprint and pin configuration. No PCB redesign is required when substituting between these part numbers.

Q: What compliance certifications apply to all substitute parts?

A: All three parts are ROHS3 compliant, REACH unaffected, and carry MSL 1 (unlimited moisture sensitivity) rating. The SZ1SMB5944BT3G additionally holds AEC-Q101 automotive qualification.

Q: Can these parts be used interchangeably in high-temperature applications?

A: Yes. All three parts operate across the identical temperature range of -65°C to 150°C, supporting equivalent thermal performance in high-temperature environments.

Q: What is the significance of the ±5% tolerance specification?

A: The ±5% tolerance applies to the nominal zener voltage of 62 V across all three parts, meaning the actual zener voltage will fall between 58.9 V and 65.1 V. This tolerance is consistent across all substitute options.

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