1SMB5947 Equivalent & Substitute Parts

Part Overview

The 1SMB5947 is an 82 V, 3 W Zener diode manufactured by Taiwan Semiconductor Corporation in Surface Mount DO-214AA (SMB) package. This component is designed for voltage regulation and protection applications requiring precise Zener voltage characteristics at moderate power dissipation levels. The part maintains Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained across the specified parameter ranges. Alternative sources and upgraded specifications are documented to support component procurement flexibility and supply chain continuity.

Substiute Parts

1SMB5947

Taiwan Semiconductor CorporationIn Stock: 8341SMB5947 Datasheet

Current PartRFQ

1SMB5947BT3G

onsemiIn Stock: 308211SMB5947BT3G Datasheet

UpgradeRFQ

SMBJ5376B-TP

Micro Commercial CoIn Stock: 6529SMBJ5376B-TP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 1SMB5947 are classified into two categories based on electrical and mechanical compatibility:

Upgrade Substitute (Direct Replacement): The 1SMB5947BT3G from onsemi maintains identical Zener voltage (82 V), tolerance (±5%), maximum power (3 W), impedance (160 Ohms), and reverse leakage current specifications. This part operates across an extended lower temperature range (-65°C minimum versus -55°C) while maintaining the same upper temperature limit (150°C). Package and mounting type are identical (DO-214AA, SMB, Surface Mount). This classification permits direct substitution in applications where the extended low-temperature performance is either beneficial or neutral.

Similar Substitute (Parameter Variance): The SMBJ5376B-TP from Micro Commercial Co exhibits variations in three key electrical parameters: Zener voltage is specified at 87 V (5 V higher than the 82 V nominal), maximum power rating is 5 W (2 W higher than 3 W), and impedance is 75 Ohms (85 Ohms lower than 160 Ohms). Reverse leakage current is 500 nA at 66 V, representing lower leakage than the 1 µA specification. This part is suitable only in applications where the higher voltage, increased power capacity, and lower impedance do not conflict with circuit design requirements.

Parameter Comparison

Engineering Selection Recommendations

1SMB5947BT3G Selection Criteria: This onsemi part is suitable for direct substitution when supply constraints affect the original Taiwan Semiconductor Corporation part. The identical electrical specifications (82 V Zener voltage, 3 W power rating, 160 Ohms impedance, 1 µA reverse leakage) ensure functional equivalence. The extended operating temperature minimum (-65°C versus -55°C) provides additional margin for low-temperature applications. All compliance certifications (ROHS3, MSL 1, REACH Unaffected) match the original specification. This part is classified as an upgrade substitute due to superior low-temperature performance without electrical trade-offs.

SMBJ5376B-TP Selection Criteria: This Micro Commercial Co part introduces three parameter variations that require circuit-level evaluation. The 87 V Zener voltage represents a 6.1% increase from the 82 V nominal specification, which may exceed tolerance requirements in voltage-sensitive applications. The 5 W power rating provides 67% additional dissipation capacity, suitable for applications with higher current or thermal demands. The 75 Ohms impedance is 53% lower than the 160 Ohms specification, resulting in improved transient response characteristics. This part is classified as a similar substitute and is applicable only when the circuit design accommodates the higher voltage and lower impedance without performance degradation. All compliance certifications match the original specification.

Both substitute parts maintain identical Surface Mount DO-214AA (SMB) package geometry, ensuring mechanical compatibility with existing PCB layouts and assembly processes. All parts carry Active product status and full RoHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can the 1SMB5947BT3G be used as a direct replacement for the 1SMB5947?

A: Yes. The 1SMB5947BT3G maintains identical Zener voltage (82 V), tolerance (±5%), power rating (3 W), impedance (160 Ohms), and reverse leakage current (1 µA @ 62.2 V). The extended low-temperature operating range (-65°C minimum) does not introduce compatibility issues. Both parts use identical DO-214AA (SMB) packaging and Surface Mount technology.

Q: What are the key differences between the 1SMB5947 and SMBJ5376B-TP?

A: Three electrical parameters differ: Zener voltage is 87 V (versus 82 V), maximum power is 5 W (versus 3 W), and impedance is 75 Ohms (versus 160 Ohms). Reverse leakage current is lower at 500 nA @ 66 V. These differences require circuit evaluation to confirm compatibility. Package and mounting type remain identical.

Q: Is the SMBJ5376B-TP suitable for all applications using the 1SMB5947?

A: No. The SMBJ5376B-TP is suitable only when the circuit design accommodates the 87 V Zener voltage, 5 W power capacity, and 75 Ohms impedance. Applications requiring precise 82 V regulation or sensitive to impedance characteristics must use the original 1SMB5947 or the 1SMB5947BT3G upgrade substitute.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. The 1SMB5947BT3G and SMBJ5376B-TP are both ROHS3 Compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the original 1SMB5947 specification.

Q: Do the substitute parts use the same package as the original 1SMB5947?

A: Yes. Both the 1SMB5947BT3G and SMBJ5376B-TP use the DO-214AA (SMB) Surface Mount package, ensuring mechanical and thermal compatibility with existing PCB designs and assembly processes.

Q: What is the operating temperature range for each part?

A: The 1SMB5947 operates from -55°C to 150°C. The 1SMB5947BT3G extends the low-temperature limit to -65°C while maintaining the 150°C upper limit. The SMBJ5376B-TP operates from -55°C to 150°C, identical to the original part.

Q: How do impedance differences affect circuit performance?

A: Impedance affects transient response and voltage regulation stability. The 1SMB5947 and 1SMB5947BT3G both specify 160 Ohms impedance. The SMBJ5376B-TP at 75 Ohms provides faster transient response but may alter regulation characteristics in sensitive applications. Circuit simulation or testing is necessary to confirm suitability in impedance-critical designs.