1SMB5947H Equivalent & Substitute Parts

Part Overview

The 1SMB5947H is an active-status Zener diode manufactured by Taiwan Semiconductor Corporation, rated for 82 V nominal Zener voltage and 3 W maximum power dissipation in a surface mount DO-214AA (SMB) package. This component is qualified to AEC-Q101 automotive standards and is RoHS3 compliant. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, supply chain considerations, or design flexibility within specified parameter tolerances.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	82	V
Tolerance	±5%	%
Power - Max	3	W
Impedance (Max)	160	Ohms
Current - Reverse Leakage @ Vr	1	µA @ 62.2 V
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	DO-214AA, SMB	—
Grade	Automotive	—
Qualification	AEC-Q101	—

Substitute Part Grouping Explanation

Substitution eligibility for the 1SMB5947H is determined by the following critical parameters: nominal Zener voltage (82 V), voltage tolerance (±5%), maximum power rating (3 W), package type (DO-214AA/SMB surface mount), and compliance certifications (RoHS3, AEC-Q101 automotive grade). Parts meeting these core electrical and mechanical specifications are classified as direct substitutes. Parts with deviations in Zener voltage, power rating, or package form factor are classified as partial or conditional substitutes and are identified with specific parameter variance notes.

Parameter Comparison

Parameter	1SMB5947H (Main)	1SMB5947BT3G (Substitute)	SMBJ5376B-TP (Partial Substitute)
Manufacturer	Taiwan Semiconductor Corporation	onsemi	Micro Commercial Co
Voltage - Zener (Nom)	82 V	82 V	87 V
Tolerance	±5%	±5%	±5%
Power - Max	3 W	3 W	5 W
Impedance (Max)	160 Ohms	160 Ohms	75 Ohms
Current - Reverse Leakage @ Vr	1 µA @ 62.2 V	1 µA @ 62.2 V	500 nA @ 66 V
Operating Temperature Range	-55 to 150 °C	-65 to 150 °C	-55 to 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

1SMB5947BT3G (onsemi) is a direct substitute for the 1SMB5947H. Both parts share identical nominal Zener voltage (82 V), tolerance (±5%), maximum power rating (3 W), impedance specification (160 Ohms), and reverse leakage current (1 µA @ 62.2 V). Both are packaged in DO-214AA/SMB surface mount format, RoHS3 compliant, and active-status products. The onsemi variant operates across an extended lower temperature range (-65°C versus -55°C), providing additional thermal margin. Both parts are suitable for direct PCB substitution without design modification.

SMBJ5376B-TP (Micro Commercial Co) is a partial substitute with parameter deviations. This part operates at a higher nominal Zener voltage (87 V versus 82 V), representing a 6.1% increase within the ±5% tolerance band of the original specification. The SMBJ5376B-TP provides higher maximum power dissipation (5 W versus 3 W) and lower impedance (75 Ohms versus 160 Ohms). These characteristics make it suitable for applications requiring higher power handling or lower dynamic impedance, but it is not a direct electrical equivalent due to the Zener voltage offset. Selection of this part requires circuit-level validation to confirm voltage regulation performance remains within system requirements.

All three parts maintain RoHS3 compliance, active product status, and surface mount DO-214AA/SMB packaging. Selection between the main part and substitutes is based on availability, thermal operating range requirements, and application-specific power dissipation needs.

Frequently Asked Questions (FAQ)

Q: Can 1SMB5947BT3G replace 1SMB5947H in existing designs without PCB modification?

A: Yes. The 1SMB5947BT3G is a direct electrical and mechanical equivalent. Both parts feature identical Zener voltage (82 V), power rating (3 W), impedance (160 Ohms), and DO-214AA/SMB package geometry. No PCB layout changes are required.

Q: What is the key difference between 1SMB5947BT3G and SMBJ5376B-TP?

A: The 1SMB5947BT3G maintains the 82 V Zener voltage specification of the original part. The SMBJ5376B-TP operates at 87 V, a 6.1% higher voltage. Additionally, SMBJ5376B-TP provides 5 W power rating versus 3 W and exhibits lower impedance (75 Ohms versus 160 Ohms). These differences require circuit validation before substitution.

Q: Are all three parts automotive-qualified?

A: The 1SMB5947H carries explicit AEC-Q101 automotive qualification. The 1SMB5947BT3G and SMBJ5376B-TP are not listed with automotive qualification in the provided specifications. Automotive applications requiring AEC-Q101 certification should use the 1SMB5947H or verify automotive qualification status with the respective manufacturers.

Q: What is the operating temperature difference between the main part and 1SMB5947BT3G?

A: The 1SMB5947H operates from -55°C to 150°C. The 1SMB5947BT3G extends the lower temperature limit to -65°C, providing 10°C additional margin for cold-temperature applications. Both maintain the same 150°C upper limit.

Q: Can SMBJ5376B-TP be used in a circuit designed for 82 V Zener regulation?

A: SMBJ5376B-TP operates at 87 V nominal, which is outside the ±5% tolerance band of the 1SMB5947H (77.9 V to 86.1 V). Circuit-level analysis is required to determine if the 5 V offset is acceptable for the intended application. The higher power rating and lower impedance may provide benefits in specific designs but do not constitute a direct replacement.

Q: Are all parts RoHS3 compliant?

A: Yes. The 1SMB5947H, 1SMB5947BT3G, and SMBJ5376B-TP are all RoHS3 compliant with MSL rating of 1 (Unlimited moisture sensitivity).

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