SMZJ3791BHM3_A/I Zener Diode Equivalent & Substitute Parts

Part Overview

The SMZJ3791BHM3_A/I is a 12 V, 1.5 W surface mount zener diode manufactured by Vishay General Semiconductor - Diodes Division in the DO-214AA (SMB) package. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements and procurement needs. The part carries automotive-grade qualification (AEC-Q101) and maintains ROHS3 compliance.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	12	V
Tolerance	±5	%
Power - Maximum	1.5	W
Impedance (Maximum)	7	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 9.1 V
Operating Temperature Range	-55 to 150	°C (TJ)
Package / Case	DO-214AA, SMB
Grade	Automotive
Qualification	AEC-Q101
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the SMZJ3791BHM3_A/I is determined by strict equivalence across the following critical parameters:

Electrical Parameters:

Zener voltage: 12 V nominal
Tolerance: ±5%
Maximum power dissipation: 1.5 W
Maximum impedance: 7 Ohms
Reverse leakage current: 5 µA @ 9.1 V (or lower)
Operating temperature range: -55°C to 150°C

Mechanical & Packaging Parameters:

Package type: DO-214AA (SMB)
Mounting type: Surface Mount

Compliance & Qualification:

Automotive grade
AEC-Q101 qualification
ROHS3 compliance

All substitute parts listed maintain identical electrical specifications and package compatibility. Differences in product status (active vs. obsolete) and reverse leakage current specifications are noted where applicable.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (Nom)	Tolerance	Power Max	Zzt (Max)	Reverse Leakage @ Vr	Temp Range	Package	Product Status	AEC-Q101	Inventory
SMZJ3791BHM3_A/I	Vishay	12 V	±5%	1.5 W	7 Ω	5 µA @ 9.1 V	-55 to 150°C	DO-214AA (SMB)	Obsolete	Yes	865 Pcs
SMZJ3791BHE3_B/I	Vishay	12 V	±5%	1.5 W	7 Ω	5 µA @ 9.1 V	-55 to 150°C	DO-214AA (SMB)	Active	Yes	1111 Pcs
SMZJ3791BHM3_B/I	Vishay	12 V	±5%	1.5 W	7 Ω	5 µA @ 9.1 V	-55 to 150°C	DO-214AA (SMB)	Active	Yes	1075 Pcs
1SMB5927-AU_R1_000A1	Panjit International Inc.	12 V	±5%	1.5 W	7 Ω	1 µA @ 9.1 V	-55 to 150°C	DO-214AA (SMB)	Active	Yes	1634 Pcs
1SMB5927_R1_00001	Panjit International Inc.	12 V	±5%	1.5 W	7 Ω	1 µA @ 9.1 V	-55 to 150°C	DO-214AA (SMB)	Active	Yes	3700 Pcs

Engineering Selection Recommendations

Vishay Equivalents (SMZJ3791BHE3_B/I and SMZJ3791BHM3_B/I): These parts are direct parametric equivalents to the obsolete SMZJ3791BHM3_A/I. Both are manufactured by the same supplier (Vishay General Semiconductor - Diodes Division), carry identical electrical specifications, and maintain active product status. Both hold AEC-Q101 automotive qualification and ROHS3 compliance. Selection between these two Vishay variants depends on packaging requirements (Tape & Reel format for both).

Panjit International Inc. Equivalents (1SMB5927-AU_R1_000A1 and 1SMB5927_R1_00001): These parts meet all critical electrical and mechanical parameters. Both are active products with AEC-Q101 qualification and ROHS3 compliance. A distinguishing characteristic is the reverse leakage current specification of 1 µA @ 9.1 V, which is lower than the original part's 5 µA specification. This represents improved leakage performance and does not preclude substitution. Both Panjit variants are supplied in Tape & Reel packaging.

Procurement Considerations: All substitute parts are currently in active production status with substantial inventory availability. The Panjit 1SMB5927_R1_00001 variant offers the highest inventory level (3700 Pcs), followed by the Panjit 1SMB5927-AU_R1_000A1 (1634 Pcs). Vishay variants maintain lower but adequate inventory levels.

Frequently Asked Questions (FAQ)

Q: Can SMZJ3791BHE3_B/I and SMZJ3791BHM3_B/I be used interchangeably with the obsolete SMZJ3791BHM3_A/I?

A: Yes. Both Vishay parts are parametric equivalents with identical zener voltage (12 V), tolerance (±5%), power rating (1.5 W), impedance (7 Ω), reverse leakage current (5 µA @ 9.1 V), and operating temperature range (-55°C to 150°C). Package compatibility (DO-214AA/SMB) and automotive qualification (AEC-Q101) are maintained.

Q: What is the difference between the Vishay and Panjit substitute options?

A: The primary difference is manufacturer. Vishay parts (SMZJ3791BHE3_B/I and SMZJ3791BHM3_B/I) maintain identical reverse leakage specifications (5 µA @ 9.1 V) to the original part. Panjit parts (1SMB5927-AU_R1_000A1 and 1SMB5927_R1_00001) specify lower reverse leakage current (1 µA @ 9.1 V), representing improved performance. All other electrical and mechanical parameters are equivalent.

Q: Are the Panjit 1SMB5927-AU_R1_000A1 and 1SMB5927_R1_00001 parts functionally identical?

A: Yes. Both Panjit parts share identical electrical specifications, package type (DO-214AA/SMB), automotive grade, AEC-Q101 qualification, and ROHS3 compliance. Differences are limited to part numbering and inventory levels.

Q: Does the lower reverse leakage current in Panjit parts affect circuit compatibility?

A: No. Lower reverse leakage current (1 µA vs. 5 µA) represents improved performance characteristics and does not create compatibility issues. The original specification of 5 µA is a maximum limit; Panjit parts operating at 1 µA remain within acceptable parameters for any circuit designed for the original part.

Q: Are all substitute parts suitable for automotive applications?

A: Yes. All substitute parts carry automotive-grade classification and AEC-Q101 qualification, matching the original part's automotive credentials.

Q: What packaging format is supplied for these substitute parts?

A: All substitute parts are supplied in Tape & Reel (TR) format, suitable for automated assembly processes.

Q: Is RoHS compliance maintained across all substitute options?

A: Yes. All substitute parts maintain ROHS3 compliance, consistent with the original SMZJ3791BHM3_A/I specification.

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