1SMA4757 Zener Diode Equivalent & Substitute Parts

Part Overview

The 1SMA4757 is an active-status zener diode manufactured by SMC Diode Solutions, rated for 51 V nominal zener voltage with 1 W maximum power dissipation in a surface mount SMA (DO-214AC) package. This component is designed for voltage regulation and protection applications requiring stable reverse-bias operation across industrial temperature ranges. Substitute parts are identified to provide equivalent electrical performance and mechanical compatibility when the primary part is unavailable or when design flexibility across qualified suppliers is required.

Substiute Parts

1SMA4757

SMC Diode SolutionsIn Stock: 17271SMA4757 Datasheet

Current PartRFQ

SMAJ4757A-TP

Micro Commercial CoIn Stock: 6489SMAJ4757A-TP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 1SMA4757 are qualified based on the following electrical and mechanical parameters:

Critical Matching Parameters:

• Voltage - Zener (Nominal): 51 V
• Tolerance: ±5%
• Power - Maximum: 1 W
• Impedance (Maximum): 95 Ohms
• Package / Case: DO-214AC (SMA)
• Mounting Type: Surface Mount
• Operating Temperature Range: -65°C to 150°C

The SMAJ4757A-TP manufactured by Micro Commercial Co meets all critical electrical specifications and mechanical compatibility requirements. Both parts operate within identical zener voltage and power ratings, share the same surface mount package footprint, and support the full industrial temperature operating range. Reverse leakage current specifications differ slightly between parts but remain within acceptable operational parameters for this device category.

Parameter Comparison

Engineering Selection Recommendations

Both the 1SMA4757 and SMAJ4757A-TP are active-status products with ROHS3 compliance and MSL Level 1 ratings, indicating full environmental and regulatory qualification for industrial applications. The 1SMA4757 maintains 1,675 units in current inventory, while the SMAJ4757A-TP provides 6,424 units in stock, offering extended supply availability. Selection between these parts should be based on procurement lead time, inventory position, and supplier qualification requirements within the design organization. Both parts satisfy identical electrical performance criteria and mechanical compatibility for direct substitution in surface mount applications.

Frequently Asked Questions (FAQ)

Q: Can the SMAJ4757A-TP be used as a direct replacement for the 1SMA4757?

A: Yes. Both parts share identical zener voltage (51 V), power rating (1 W), impedance (95 Ohms maximum), operating temperature range (-65°C to 150°C), and surface mount package (DO-214AC/SMA). Electrical performance and mechanical compatibility are equivalent.

Q: What are the key differences between these two parts?

A: The primary differences are manufacturer (SMC Diode Solutions versus Micro Commercial Co) and reverse leakage current test conditions (5 µA @ 38.8 V for 1SMA4757 versus 5 µA @ 51 V for SMAJ4757A-TP). Forward voltage specifications differ slightly in test current (200 mA versus 100 mA), but both maintain the 1.2 V maximum rating. These variations do not affect functional equivalence.

Q: Are both parts RoHS compliant?

A: Yes. Both the 1SMA4757 and SMAJ4757A-TP are ROHS3 compliant with MSL Level 1 (Unlimited) moisture sensitivity ratings, suitable for standard PCB assembly and storage conditions.

Q: What is the package compatibility between these parts?

A: Both parts use the DO-214AC surface mount package, commonly designated as SMA. They share identical footprints and are mechanically interchangeable on PCB layouts designed for this package type.

Q: Which part should be selected for new designs?

A: Selection should be based on supplier qualification, inventory availability, and procurement strategy. The SMAJ4757A-TP currently maintains higher inventory levels (6,424 units), while the 1SMA4757 is the original specified part. Both are active-status products suitable for production use.