1SMB5916B-13 Equivalent & Substitute Parts

Part Overview

The 1SMB5916B-13 is a Zener diode rated at 4.3 V nominal with 550 mW maximum power dissipation in a Surface Mount SMB (DO-214AA) package. This component is manufactured by Diodes Incorporated and is classified as obsolete. Due to its obsolete status and limited availability relative to active alternatives, identification of functionally equivalent substitute parts is necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	4.3	V
Tolerance	±5%	%
Power - Max	550	mW
Impedance (Max)	6	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 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	—

Substitute Part Grouping Explanation

Substitution of the 1SMB5916B-13 is determined by equivalence across the following critical parameters:

Zener Voltage (Vz): The substitute part must maintain the same 4.3 V nominal zener voltage with ±5% tolerance to ensure circuit regulation specifications are met.

Package and Mounting: Both the main part and substitute must use the SMB (DO-214AA) Surface Mount package to ensure mechanical and electrical compatibility with existing PCB layouts.

Impedance (Zzt): The maximum impedance of 6 Ohms must be matched to preserve dynamic impedance characteristics in the circuit.

Reverse Leakage Current: The 5 µA @ 1 V specification must be maintained for leakage performance consistency.

Forward Voltage: The maximum forward voltage of 1.5 V @ 200 mA must be preserved for forward-biased operation.

Operating Temperature Range: The -65°C to 150°C junction temperature range must be supported.

The 1SMB5916BT3G meets all these criteria. While its maximum power rating (3 W) exceeds the original specification (550 mW), this represents an enhancement that does not compromise circuit function and provides additional thermal margin.

Parameter Comparison

Parameter	1SMB5916B-13	1SMB5916BT3G	Match
Manufacturer	Diodes Incorporated	onsemi	Different
Voltage - Zener (Nom)	4.3 V	4.3 V	Yes
Tolerance	±5%	±5%	Yes
Power - Max	550 mW	3 W	Compatible*
Impedance (Max)	6 Ohms	6 Ohms	Yes
Current - Reverse Leakage @ Vr	5 µA @ 1 V	5 µA @ 1 V	Yes
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA	1.5 V @ 200 mA	Yes
Operating Temperature	-65°C ~ 150°C	-65°C ~ 150°C	Yes
Mounting Type	Surface Mount	Surface Mount	Yes
Package / Case	DO-214AA, SMB	DO-214AA, SMB	Yes
Product Status	Obsolete	Active	Substitute is Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Yes
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Yes

*The 1SMB5916BT3G power rating of 3 W exceeds the original 550 mW specification, providing enhanced thermal capability without reducing performance.

Engineering Selection Recommendations

The 1SMB5916BT3G is the direct substitute for the obsolete 1SMB5916B-13. Selection of this substitute is supported by the following factors:

Product Status: The 1SMB5916BT3G maintains Active product status, ensuring long-term availability and manufacturing support. The original part is Obsolete, making continued sourcing impractical.

Regulatory Compliance: Both parts are ROHS3 Compliant and carry equivalent moisture sensitivity ratings (MSL 1, Unlimited). The substitute is REACH Unaffected, whereas the original is REACH Affected, providing improved regulatory positioning.

Electrical Equivalence: All critical electrical parameters—zener voltage, tolerance, impedance, leakage current, and forward voltage—are identical between the two parts. The enhanced power rating of the substitute provides additional design margin without introducing incompatibility.

Package Compatibility: Both parts use the SMB (DO-214AA) Surface Mount package, ensuring direct PCB layout compatibility with no redesign required.

Inventory Availability: The 1SMB5916BT3G has significantly higher inventory availability (31,073 pcs) compared to the original part (1,250 pcs), supporting production continuity.

Frequently Asked Questions (FAQ)

Q: Can the 1SMB5916BT3G be used as a direct replacement for the 1SMB5916B-13 without circuit modification?

A: Yes. The 1SMB5916BT3G is electrically and mechanically equivalent. All critical parameters—zener voltage, tolerance, impedance, leakage current, forward voltage, and operating temperature range—are identical. The SMB package footprint is the same, requiring no PCB layout changes.

Q: Why does the 1SMB5916BT3G have a higher power rating (3 W vs. 550 mW)?

A: The higher power rating represents an enhancement in thermal capability. This does not compromise circuit function and provides additional margin for thermal stress. The part will operate identically in circuits designed for the original 550 mW specification.

Q: Are there any compliance or regulatory differences between these parts?

A: Both parts are ROHS3 Compliant with MSL 1 (Unlimited) moisture sensitivity. The 1SMB5916BT3G is REACH Unaffected, whereas the original is REACH Affected. This provides improved regulatory positioning for the substitute.

Q: What is the base product number relationship between these parts?

A: Both the 1SMB5916B-13 and 1SMB5916BT3G share the base product number 1SMB5916, indicating they are part of the same zener diode family with identical core specifications.

Q: Is the SMB package the same for both parts?

A: Yes. Both parts use the DO-214AA SMB Surface Mount package. No package conversion or PCB redesign is necessary.

Q: Why is the original part classified as Obsolete?

A: The 1SMB5916B-13 is no longer in active production. The 1SMB5916BT3G represents the current active equivalent from the same product family, ensuring continued availability and manufacturing support.

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