1SMB5919AT3 Equivalent & Substitute Parts

Part Overview

The 1SMB5919AT3 is a Zener diode rated at 5.6 V nominal voltage with 3 W maximum power dissipation in a Surface Mount SMB (DO-214AA) package. This component is classified as obsolete, which necessitates identification of active equivalent alternatives for ongoing design support and procurement. The substitute parts listed maintain identical electrical specifications and mechanical compatibility while offering active product status and improved compliance certifications.

Key Parameters

Parameter	Value
Voltage - Zener (Nom) (Vz)	5.6 V
Tolerance	±5%
Power - Max	3 W
Impedance (Max) (Zzt)	2 Ohms
Current - Reverse Leakage @ Vr	5 µA @ 3 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA
Operating Temperature Range	-65°C ~ 150°C
Mounting Type	Surface Mount
Package / Case	DO-214AA, SMB

Substitute Part Grouping Explanation

Substitution of the 1SMB5919AT3 is determined by strict equivalence across the following electrical and mechanical parameters:

Zener voltage: 5.6 V nominal
Power rating: 3 W maximum
Voltage tolerance: ±5%
Maximum impedance: 2 Ohms
Reverse leakage current: 5 µA @ 3 V
Forward voltage: 1.5 V @ 200 mA
Operating temperature range: -65°C ~ 150°C
Package type: DO-214AA, SMB Surface Mount

All substitute parts identified maintain these specifications without deviation. Differences exist only in product status, packaging format (Cut Tape, Digi-Reel, or Tape & Reel), RoHS compliance level, and automotive qualification where applicable.

Parameter Comparison

Parameter	1SMB5919AT3	1SMB5919BT3G	S1Z1SMB5919BT3G	SZ1SMB5919BT3G
Manufacturer	onsemi	onsemi	onsemi	onsemi
Category	Diodes, Zener	Diodes, Zener	Diodes, Zener	Diodes, Zener
Voltage - Zener (Nom) (Vz)	5.6 V	5.6 V	5.6 V	5.6 V
Tolerance	±5%	±5%	±5%	±5%
Power - Max	3 W	3 W	3 W	3 W
Impedance (Max) (Zzt)	2 Ohms	2 Ohms	2 Ohms	2 Ohms
Current - Reverse Leakage @ Vr	5 µA @ 3 V	5 µA @ 3 V	5 µA @ 3 V	5 µA @ 3 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA	1.5 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	-65°C ~ 150°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Product Status	Obsolete	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Automotive Grade	Not specified	Not specified	Automotive (AEC-Q101)	Automotive (AEC-Q101)
Packaging Format	Not specified	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®

Engineering Selection Recommendations

All three substitute parts (1SMB5919BT3G, S1Z1SMB5919BT3G, and SZ1SMB5919BT3G) provide direct electrical and mechanical equivalence to the obsolete 1SMB5919AT3. Selection among these alternatives is based on the following criteria:

1SMB5919BT3G is the standard industrial-grade equivalent. It maintains full electrical specification compliance and offers ROHS3 compliance with Cut Tape and Digi-Reel packaging options. This part is suitable for general commercial applications requiring an active replacement.

S1Z1SMB5919BT3G and SZ1SMB5919BT3G are automotive-qualified variants carrying AEC-Q101 certification. These parts are required for applications subject to automotive industry standards and reliability requirements. S1Z1SMB5919BT3G is supplied in Tape & Reel format, while SZ1SMB5919BT3G is available in Cut Tape and Digi-Reel formats.

All substitute parts maintain REACH Unaffected status and identical ECCN and HTSUS classifications. Selection should be based on application requirements (automotive versus industrial) and packaging format compatibility with assembly processes.

Frequently Asked Questions (FAQ)

Q: Can 1SMB5919BT3G be used as a direct replacement for 1SMB5919AT3?

A: Yes. The 1SMB5919BT3G maintains identical electrical specifications including 5.6 V nominal zener voltage, 3 W power rating, ±5% tolerance, and all other electrical parameters. Both use the DO-214AA SMB package. The primary difference is product status (Active versus Obsolete) and RoHS compliance level.

Q: What is the difference between the three substitute parts?

A: All three substitutes share identical electrical and mechanical specifications. The differences are: (1) 1SMB5919BT3G is industrial-grade; (2) S1Z1SMB5919BT3G and SZ1SMB5919BT3G are automotive-qualified with AEC-Q101 certification; (3) packaging formats differ (Cut Tape/Digi-Reel versus Tape & Reel).

Q: Are the automotive-qualified parts (S1Z1SMB5919BT3G and SZ1SMB5919BT3G) suitable for non-automotive applications?

A: Yes. Automotive-qualified parts meet or exceed industrial specifications and are fully compatible with non-automotive applications. Selection of automotive-grade parts is driven by application requirements, not by restriction.

Q: Does the packaging format affect electrical performance?

A: No. Packaging format (Cut Tape, Digi-Reel, or Tape & Reel) affects only procurement and assembly logistics. Electrical and mechanical specifications remain identical across all packaging options for a given part number.

Q: Are all substitute parts RoHS compliant?

A: Yes. All three substitute parts (1SMB5919BT3G, S1Z1SMB5919BT3G, and SZ1SMB5919BT3G) are ROHS3 compliant. The original 1SMB5919AT3 is RoHS non-compliant, which is another reason for substitution in modern designs.

Q: What is the moisture sensitivity level for these parts?

A: All parts, including the original and all substitutes, have Moisture Sensitivity Level (MSL) of 1 (Unlimited), indicating no moisture sensitivity restrictions for storage or handling.

Q: Can these parts be used interchangeably in existing PCB designs?

A: Yes. All substitute parts use the identical DO-214AA SMB package with the same pin configuration and footprint. No PCB layout modifications are required for substitution.

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