SML4747HE3_A/I Equivalent & Substitute Parts

Part Overview

The SML4747HE3_A/I is an automotive-grade Zener diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates at a nominal Zener voltage of 20 V with 1 W maximum power dissipation in a DO-214AC (SMA) package. The device is AEC-Q101 qualified and maintains active product status with 795 units currently in stock.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility are maintained across the critical parameters that define functional interchangeability in circuit applications. The primary substitute listed meets the core voltage, power, and package requirements while offering alternative tolerance and availability characteristics.

Substiute Parts

SML4747HE3_A/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 810SML4747HE3_A/I Datasheet

Current PartRFQ

SMAJ4747A-TP

Micro Commercial CoIn Stock: 31171SMAJ4747A-TP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SML4747HE3_A/I is determined by the following critical parameters:

Electrical Compatibility Requirements:

• Voltage - Zener (Nominal): 20 V (exact match required)
• Power - Maximum: 1 W (minimum requirement)
• Impedance (Maximum): 22 Ohms (maximum allowable)
• Current - Reverse Leakage @ Vr: 5 µA @ 15.2 V (maximum allowable)
• Operating Temperature Range: -65°C to 150°C (minimum coverage required)

Mechanical Compatibility Requirements:

• Package / Case: DO-214AC (SMA) (exact match required)
• Mounting Type: Surface Mount (exact match required)

The substitute part SMAJ4747A-TP from Micro Commercial Co satisfies all electrical and mechanical compatibility criteria. The tolerance specification differs (±5% versus ±10%), representing an improvement in voltage accuracy that does not restrict interchangeability.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection: SML4747HE3_A/I

The SML4747HE3_A/I maintains active product status with AEC-Q101 automotive qualification. This component is suitable for applications requiring automotive-grade reliability and traceability. Current inventory of 795 units supports immediate procurement requirements.

Substitute Selection: SMAJ4747A-TP

The SMAJ4747A-TP from Micro Commercial Co provides functional equivalence with identical electrical performance across all critical parameters. This substitute carries ROHS3 compliance and REACH unaffected status, matching the regulatory profile of the primary part. Significantly higher inventory availability (31,069 units) supports extended supply chain requirements. The tighter tolerance specification (±5% versus ±10%) represents improved voltage accuracy without introducing compatibility restrictions.

Both components are suitable for direct substitution in applications where the specified electrical and thermal characteristics are required. Selection between primary and substitute parts should be based on supply availability, lead time requirements, and inventory management objectives.

Frequently Asked Questions (FAQ)

Q: Can SMAJ4747A-TP replace SML4747HE3_A/I in existing designs?

A: Yes. Both components share identical nominal Zener voltage (20 V), maximum power rating (1 W), impedance specification (22 Ohms), reverse leakage current (5 µA @ 15.2 V), operating temperature range (-65°C to 150°C), and package configuration (DO-214AC/SMA surface mount). The substitute part meets or exceeds all electrical and mechanical requirements for direct substitution.

Q: What is the difference in tolerance between these parts?

A: The SML4747HE3_A/I specifies ±10% tolerance on the nominal 20 V Zener voltage, while the SMAJ4747A-TP specifies ±5% tolerance. The tighter tolerance of the substitute part does not restrict interchangeability; it provides improved voltage accuracy within the acceptable operating range of the original design.

Q: Are both parts automotive qualified?

A: The SML4747HE3_A/I carries AEC-Q101 automotive qualification. The SMAJ4747A-TP does not list AEC-Q101 qualification in the provided specifications. For applications requiring explicit automotive qualification, the SML4747HE3_A/I is the appropriate selection.

Q: Do both parts have identical moisture sensitivity ratings?

A: Yes. Both the SML4747HE3_A/I and SMAJ4747A-TP carry Moisture Sensitivity Level (MSL) 1, indicating unlimited shelf life without moisture control requirements.

Q: Are there any regulatory compliance differences?

A: Both components are ROHS3 compliant and REACH unaffected. Regulatory compliance profiles are identical across both parts.

Q: Can these parts be used interchangeably on the same PCB assembly?

A: Yes. Both components use the DO-214AC (SMA) surface mount package with identical mechanical dimensions and land pattern requirements. No PCB layout modifications are required for substitution.