1SMB5950 Equivalent & Substitute Parts

Part Overview

The 1SMB5950 is an active surface mount zener diode manufactured by Taiwan Semiconductor Corporation, rated for 110 V nominal zener voltage and 3 W maximum power dissipation in a DO-214AA (SMB) package. This component is designed for voltage regulation and transient suppression applications requiring precise voltage clamping at 110 V. Substitute parts are identified based on matching or exceeding electrical performance parameters while maintaining compatible package form factors and operating specifications.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	110	V
Power - Max	3	W
Tolerance	±5%	%
Impedance (Max)	300	Ohms
Current - Reverse Leakage @ Vr	1	µA @ 83.6 V
Operating Temperature Range	-55 to 150	°C
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the 1SMB5950 is determined by the following criteria:

Primary Substitution Criteria:

Zener voltage (Vz) matching or within application tolerance
Power rating equal to or exceeding 3 W
Surface mount package compatibility (DO-214AA / SMB)
Operating temperature range encompassing -55°C to 150°C
RoHS3 compliance and equivalent regulatory status

Substitute Classification:

Direct Equivalent (Voltage Match): SMBJ5379B-TP matches the 110 V zener voltage specification with enhanced power rating (5 W) and improved impedance characteristics (125 Ohms vs. 300 Ohms maximum).

Functional Equivalent (Voltage Variant): 1SMB5951BT3G provides 120 V zener voltage with identical 3 W power rating and compatible package, suitable for applications where 120 V regulation is acceptable within system design parameters.

Parameter Comparison

Parameter	1SMB5950 (Main)	SMBJ5379B-TP	1SMB5951BT3G
Manufacturer	Taiwan Semiconductor Corporation	Micro Commercial Co	onsemi
Voltage - Zener (Nom)	110 V	110 V	120 V
Tolerance	±5%	±5%	±5%
Power - Max	3 W	5 W	3 W
Impedance (Max)	300 Ohms	125 Ohms	380 Ohms
Current - Reverse Leakage @ Vr	1 µA @ 83.6 V	500 nA @ 83.6 V	1 µA @ 91.2 V
Operating Temperature	-55°C ~ 150°C	-55°C ~ 150°C	-65°C ~ 150°C
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Mounting Type	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active

Engineering Selection Recommendations

SMBJ5379B-TP Selection Rationale: This substitute provides identical 110 V zener voltage specification with superior power handling (5 W vs. 3 W). The lower impedance (125 Ohms) delivers improved voltage regulation stability. All regulatory certifications (ROHS3, REACH Unaffected, EAR99) match the main part. Operating temperature range (-55°C to 150°C) is identical. This part is suitable for applications requiring enhanced thermal performance or higher transient current capacity while maintaining the original voltage regulation point.

1SMB5951BT3G Selection Rationale: This substitute maintains the 3 W power rating and identical tolerance specification (±5%). The 120 V zener voltage represents a 9.1% increase from the 110 V specification. This part is suitable only for applications where 120 V regulation is functionally acceptable or where system design parameters permit this voltage shift. Extended operating temperature range (-65°C to 150°C) provides additional low-temperature margin. All regulatory compliance certifications are equivalent to the main part.

Frequently Asked Questions (FAQ)

Q: Can SMBJ5379B-TP directly replace 1SMB5950 in all applications?

A: SMBJ5379B-TP provides identical 110 V zener voltage and is electrically compatible. The 5 W power rating exceeds the 3 W specification, making it suitable for applications with equivalent or lower power dissipation requirements. Package form factor (DO-214AA / SMB) and mounting type (surface mount) are identical. Verify circuit board thermal design accommodates the substitute component if power dissipation approaches rated limits.

Q: What is the voltage difference impact when using 1SMB5951BT3G?

A: The 1SMB5951BT3G operates at 120 V nominal zener voltage compared to 110 V for the 1SMB5950. This represents a 10 V absolute difference. Substitution is valid only if the application circuit design permits 120 V regulation instead of 110 V. Review system voltage tolerance specifications and downstream component ratings before selection.

Q: Are all three parts available in the same packaging format?

A: All three parts use DO-214AA (SMB) surface mount package with identical mechanical dimensions and land pattern compatibility. Packaging format differences exist only in supplier delivery method: 1SMB5950 and SMBJ5379B-TP are supplied in Tape & Reel (TR), while 1SMB5951BT3G is supplied in Cut Tape (CT) & Digi-Reel®. PCB assembly compatibility is identical.

Q: How do impedance differences affect circuit performance?

A: Impedance (Zzt) values are 300 Ohms (1SMB5950), 125 Ohms (SMBJ5379B-TP), and 380 Ohms (1SMB5951BT3G). Lower impedance provides faster voltage regulation response and reduced voltage ripple under transient conditions. Higher impedance results in slower regulation response. Select based on circuit transient suppression requirements and acceptable voltage ripple specifications.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All three parts carry ROHS3 Compliant certification and REACH Unaffected status, meeting equivalent environmental and regulatory requirements for commercial and industrial applications.

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