1SMB5927H Zener Diode Equivalent & Substitute Parts

Part Overview

The 1SMB5927H is a 12 V, 3 W surface mount zener diode manufactured by Taiwan Semiconductor Corporation in DO-214AA (SMB) package format. This component is classified as an active product with AEC-Q101 automotive qualification and ROHS3 compliance. The part is supplied in Tape & Reel packaging with 997 units currently in stock.

Equivalent and substitute parts are identified based on matching electrical specifications, mechanical compatibility, and operational parameters. Substitution becomes necessary when the primary part reaches end-of-life status, inventory constraints occur, or alternative sourcing is required for supply chain continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	12	V
Power - Maximum	3	W
Tolerance	±5	%
Impedance (Maximum)	6.5	Ohms
Current - Reverse Leakage @ Vr	1	µA @ 9.1 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

Substitute parts for the 1SMB5927H are classified into two categories based on electrical and mechanical parameter alignment:

Category 1: Direct Electrical Equivalents Parts that maintain identical zener voltage (12 V), power rating (3 W), tolerance (±5%), impedance (6.5 Ohms), and reverse leakage current (1 µA @ 9.1 V) specifications. These parts are interchangeable at the circuit level with no design modifications required.

Category 2: Functional Equivalents with Enhanced Specifications Parts that maintain the same zener voltage (12 V) and tolerance (±5%) but feature increased power dissipation capability (5 W) and improved impedance characteristics (2.5 Ohms). These parts provide superior thermal performance and lower dynamic impedance while maintaining voltage regulation at the same nominal level.

Key Parameters Determining Substitution:

Zener voltage nominal value: 12 V (mandatory match)
Tolerance: ±5% (mandatory match)
Package format: DO-214AA / SMB (mandatory match for PCB compatibility)
Mounting type: Surface Mount (mandatory match)
Operating temperature range: -55°C minimum (mandatory minimum)
RoHS3 compliance status (mandatory for regulated applications)

Parameter Comparison

Parameter	1SMB5927H (Main)	1SMB5927BT3G	3SMBJ5927B-TP	SMBJ5349B-TP
Manufacturer	Taiwan Semiconductor Corporation	onsemi	Micro Commercial Co	Micro Commercial Co
Voltage - Zener (Nom)	12 V	12 V	12 V	12 V
Tolerance	±5%	±5%	±5%	±5%
Power - Max	3 W	3 W	3 W	5 W
Impedance (Max)	6.5 Ohms	6.5 Ohms	6.5 Ohms	2.5 Ohms
Current - Reverse Leakage @ Vr	1 µA @ 9.1 V	1 µA @ 9.1 V	1 µA @ 9.1 V	2 µA @ 9.1 V
Operating Temperature	-55°C ~ 150°C	-65°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Packaging Format	Tape & Reel (TR)	Cut Tape (CT)	Tape & Reel (TR)	Tape & Reel (TR)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active	Active

Engineering Selection Recommendations

1SMB5927BT3G (onsemi) This substitute maintains all critical electrical parameters identical to the 1SMB5927H: 12 V zener voltage, 3 W power rating, ±5% tolerance, 6.5 Ohms impedance, and 1 µA reverse leakage current. The part is ROHS3 compliant and carries active product status. The operating temperature range extends to -65°C, providing enhanced low-temperature performance. Packaging differs as Cut Tape (CT) format rather than Tape & Reel. This part is suitable for direct substitution in applications where the lower temperature limit is beneficial or where Cut Tape packaging is acceptable.

3SMBJ5927B-TP (Micro Commercial Co) This substitute provides identical electrical specifications to the 1SMB5927H across all critical parameters: 12 V zener voltage, 3 W power rating, ±5% tolerance, 6.5 Ohms impedance, and 1 µA reverse leakage current. Operating temperature range matches the main part at -55°C to 150°C. Packaging format is Tape & Reel, consistent with the primary part. ROHS3 compliance and active product status are confirmed. This part is suitable for direct substitution with no circuit-level modifications required.

SMBJ5349B-TP (Micro Commercial Co) This substitute maintains the 12 V zener voltage and ±5% tolerance but features enhanced power dissipation at 5 W (versus 3 W) and improved impedance characteristics at 2.5 Ohms (versus 6.5 Ohms). Reverse leakage current is 2 µA at 9.1 V. Operating temperature range and Tape & Reel packaging match the primary part. ROHS3 compliance and active product status are confirmed. This part is suitable for applications requiring higher power handling capability or lower dynamic impedance while maintaining the same voltage regulation level.

Frequently Asked Questions (FAQ)

Q: Can the 1SMB5927BT3G substitute for the 1SMB5927H in all applications? A: The 1SMB5927BT3G maintains identical electrical specifications and is electrically interchangeable. The primary difference is packaging format (Cut Tape versus Tape & Reel) and extended low-temperature operating range (-65°C versus -55°C). Verify that Cut Tape packaging is compatible with your assembly process before substitution.

Q: What is the difference between the 3SMBJ5927B-TP and the main part 1SMB5927H? A: The 3SMBJ5927B-TP is electrically identical to the 1SMB5927H in all critical parameters: zener voltage, power rating, tolerance, impedance, and reverse leakage current. The primary difference is the manufacturer (Micro Commercial Co versus Taiwan Semiconductor Corporation). Both parts are ROHS3 compliant and active products. Direct substitution is supported.

Q: When should the SMBJ5349B-TP be used instead of the 1SMB5927H? A: The SMBJ5349B-TP maintains the same 12 V zener voltage and ±5% tolerance but provides enhanced specifications: 5 W power rating (versus 3 W) and 2.5 Ohms impedance (versus 6.5 Ohms). Use this part when circuit design requires higher power dissipation capability or when lower dynamic impedance improves voltage regulation performance. The part is electrically compatible at the 12 V regulation level.

Q: Are all substitute parts available in the same package format? A: The 1SMB5927H and 3SMBJ5927B-TP are supplied in Tape & Reel format. The 1SMB5927BT3G is supplied in Cut Tape format. All three parts use the DO-214AA (SMB) package case, ensuring identical PCB footprint and mounting compatibility. Verify packaging format compatibility with your assembly equipment before procurement.

Q: Do all substitute parts meet automotive qualification requirements? A: The 1SMB5927H carries AEC-Q101 automotive qualification. The substitute parts (1SMB5927BT3G, 3SMBJ5927B-TP, and SMBJ5349B-TP) are listed as active products with ROHS3 compliance. Verify specific automotive qualification requirements with the respective manufacturers if AEC-Q101 certification is mandatory for your application.

Q: What is the significance of the impedance difference in the SMBJ5349B-TP? A: The SMBJ5349B-TP features 2.5 Ohms impedance compared to 6.5 Ohms in the 1SMB5927H. Lower impedance results in reduced dynamic resistance, which improves voltage regulation stability under transient load conditions. This characteristic is beneficial in applications requiring tighter voltage regulation or faster response to load changes.

Q: Can these parts be used interchangeably on the same PCB without design changes? A: The 1SMB5927BT3G and 3SMBJ5927B-TP are direct electrical equivalents and support pin-for-pin substitution without circuit modifications. The SMBJ5349B-TP maintains the same pinout and package footprint but features different electrical characteristics (higher power rating and lower impedance). Circuit performance may improve with the SMBJ5349B-TP, but no design changes are required for basic functionality.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message