1SMB5950H Zener Diode Equivalent & Substitute Parts

Part Overview

The 1SMB5950H is an active-status surface mount Zener diode manufactured by Taiwan Semiconductor Corporation, rated for 110 V nominal Zener voltage and 3 W maximum power dissipation in the DO-214AA (SMB) package. This component is qualified to AEC-Q101 automotive standards and is ROHS3 compliant. Substitute parts are identified to address application requirements including alternative voltage ratings, increased power ratings, or packaging format preferences while maintaining electrical and mechanical compatibility within the SMB package family.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	110	V
Tolerance	±5%	%
Power - Max	3	W
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	—
Grade	Automotive	—
Qualification	AEC-Q101	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the 1SMB5950H is determined by the following electrical and mechanical parameters:

Primary Substitution Criteria:

Package / Case: DO-214AA (SMB) surface mount package
Mounting Type: Surface Mount
Tolerance: ±5%
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

Secondary Substitution Parameters:

Voltage - Zener (Nom): 110 V or 120 V nominal ratings
Power - Max: 3 W or 5 W ratings
Operating Temperature Range: -55°C to -65°C minimum; 150°C maximum
Impedance (Max): Zzt values within specified ranges
Current - Reverse Leakage: Measured at respective Vr conditions

Substitute parts are grouped into two voltage categories (110 V and 120 V) and two power categories (3 W and 5 W). All substitute parts maintain the DO-214AA (SMB) package format and surface mount mounting type. Automotive-grade parts with AEC-Q101 qualification are identified separately from commercial-grade alternatives.

Parameter Comparison

Parameter	1SMB5950H (Main)	1SMB5951BT3G	SZ1SMB5951BT3G	SMBJ5379B-TP	SMBJ5380B-TP
Manufacturer	Taiwan Semiconductor	onsemi	onsemi	Micro Commercial Co	Micro Commercial Co
Voltage - Zener (Nom)	110 V	120 V	120 V	110 V	120 V
Tolerance	±5%	±5%	±5%	±5%	±5%
Power - Max	3 W	3 W	3 W	5 W	5 W
Impedance (Max)	300 Ω	380 Ω	380 Ω	125 Ω	170 Ω
Current - Reverse Leakage	1 µA @ 83.6 V	1 µA @ 91.2 V	1 µA @ 91.2 V	500 nA @ 83.6 V	500 nA @ 91.2 V
Operating Temperature	-55 to 150 °C	-65 to 150 °C	-65 to 150 °C	-55 to 150 °C	-55 to 150 °C
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Grade	Automotive	Commercial	Automotive	Commercial	Commercial
Qualification	AEC-Q101	—	AEC-Q101	—	—
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Automotive Applications with AEC-Q101 Requirement:

The SZ1SMB5951BT3G (onsemi) is the direct automotive-grade substitute for the 1SMB5950H. Both parts carry AEC-Q101 qualification and automotive-grade designation. The SZ1SMB5951BT3G operates at 120 V nominal Zener voltage with identical 3 W power rating and maintains the DO-214AA (SMB) package. Operating temperature range extends to -65°C minimum, providing enhanced low-temperature performance. This part is suitable for applications where automotive qualification is mandatory.

For 110 V Zener Voltage Requirement:

The SMBJ5379B-TP (Micro Commercial Co) maintains the 110 V nominal Zener voltage of the 1SMB5950H while providing increased power dissipation at 5 W. This part is appropriate for applications requiring the same voltage regulation point with higher thermal capacity. Impedance is reduced to 125 Ω, providing improved dynamic response characteristics.

For 120 V Zener Voltage Requirement:

The 1SMB5951BT3G (onsemi) and SMBJ5380B-TP (Micro Commercial Co) both provide 120 V nominal Zener voltage. The 1SMB5951BT3G maintains 3 W power rating with extended temperature range (-65°C minimum). The SMBJ5380B-TP provides 5 W power rating with reduced impedance (170 Ω) for improved regulation characteristics.

For Increased Power Dissipation:

Both SMBJ5379B-TP and SMBJ5380B-TP offer 5 W maximum power rating compared to the 3 W rating of the 1SMB5950H. These parts are suitable for applications requiring higher thermal capacity while maintaining the same package footprint.

All substitute parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the environmental compliance profile of the 1SMB5950H.

Frequently Asked Questions (FAQ)

Q: Can the 1SMB5951BT3G replace the 1SMB5950H in all applications?

A: The 1SMB5951BT3G differs in Zener voltage (120 V vs. 110 V) and lacks automotive-grade qualification. Substitution is valid only for applications where 120 V regulation is acceptable and automotive qualification is not required. Both parts maintain identical 3 W power rating, DO-214AA package, and surface mount mounting type.

Q: What is the difference between the SMBJ5379B-TP and SMBJ5380B-TP?

A: The SMBJ5379B-TP is rated for 110 V Zener voltage with 5 W power dissipation, while the SMBJ5380B-TP is rated for 120 V Zener voltage with 5 W power dissipation. Both parts use the DO-214AA (SMB) package and surface mount mounting type. Selection depends on the required Zener voltage for the application.

Q: Is the SZ1SMB5951BT3G suitable for automotive applications?

A: Yes. The SZ1SMB5951BT3G carries AEC-Q101 qualification and automotive-grade designation, making it suitable for automotive applications. It operates at 120 V nominal Zener voltage with 3 W power rating and extends the operating temperature range to -65°C minimum.

Q: What is the impact of impedance differences between substitute parts?

A: Impedance (Zzt) affects the dynamic response and regulation characteristics of the Zener diode. Lower impedance values (125 Ω for SMBJ5379B-TP, 170 Ω for SMBJ5380B-TP) provide improved voltage regulation under transient conditions compared to higher impedance values (300 Ω for 1SMB5950H, 380 Ω for 1SMB5951BT3G and SZ1SMB5951BT3G). Selection depends on circuit requirements for transient response.

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

A: All substitute parts use the DO-214AA (SMB) surface mount package. Packaging format options differ: the 1SMB5950H and SMBJ5379B-TP are supplied in Tape & Reel (TR) format, while the 1SMB5951BT3G and SMBJ5380B-TP are supplied in Cut Tape (CT) & Digi-Reel® format, and the SZ1SMB5951BT3G is supplied in Tape & Reel (TR) format. Packaging format does not affect electrical or mechanical compatibility.

Q: What is the reverse leakage current specification and how does it affect part selection?

A: Reverse leakage current is measured at specified reverse voltage conditions. The 1SMB5950H specifies 1 µA @ 83.6 V, while the SMBJ5379B-TP and SMBJ5380B-TP specify lower leakage at 500 nA. Lower reverse leakage indicates reduced standby current consumption. Selection depends on application requirements for leakage characteristics.

Q: Can I use a 5 W rated part as a substitute for a 3 W rated part?

A: Yes, from a thermal capacity perspective. The SMBJ5379B-TP (110 V, 5 W) and SMBJ5380B-TP (120 V, 5 W) provide higher power dissipation capability than the 1SMB5950H (110 V, 3 W). However, substitution is valid only if the Zener voltage rating matches application requirements and the circuit design accommodates the different impedance characteristics.

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