1SMA4741 Zener Diode Equivalent & Substitute Parts

Part Overview

The 1SMA4741 is an active-status zener diode manufactured by SMC Diode Solutions, rated for 11 V nominal zener voltage with 1 W maximum power dissipation. The device is packaged in the DO-214AC (SMA) surface mount form factor and complies with ROHS3 and REACH regulations. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity for applications requiring 11 V zener regulation in surface mount configurations.

Substiute Parts

1SMA4741

SMC Diode SolutionsIn Stock: 8121SMA4741 Datasheet

Current PartRFQ

SMAJ4741A-TP

Micro Commercial CoIn Stock: 1499SMAJ4741A-TP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1SMA4741 is determined by equivalence across the following critical parameters:

Zener voltage specification (11 V nominal) with matching tolerance (±5%) ensures voltage regulation performance remains within design requirements. Maximum power rating (1 W) and impedance specification (8 Ohms maximum) must be maintained to preserve circuit protection and transient response characteristics. Reverse leakage current (5 µA @ 8.4 V) and forward voltage drop (1.2 V maximum) define the diode's operational boundaries in both reverse and forward bias conditions. Operating temperature range (-65°C to 150°C) establishes thermal compatibility with the application environment. Surface mount packaging in DO-214AC (SMA) form factor is mandatory for mechanical and electrical interconnection compatibility. Regulatory compliance (ROHS3) is required for end-use market acceptance.

The substitute part SMAJ4741A-TP from Micro Commercial Co meets all specified electrical and mechanical parameters and maintains equivalent functional performance.

Parameter Comparison

Engineering Selection Recommendations

Both the 1SMA4741 and SMAJ4741A-TP are active-status products with ROHS3 compliance, suitable for applications requiring 11 V zener regulation in surface mount configurations. Selection between these parts is based on availability, lead time, and procurement source preference, as electrical and mechanical specifications are equivalent. The 1SMA4741 is currently stocked at 732 pieces. The SMAJ4741A-TP is currently stocked at 1404 pieces. Both devices operate across the -65°C to 150°C temperature range and are packaged in the DO-214AC (SMA) form factor, ensuring direct mechanical and electrical interchangeability on printed circuit boards designed for this package type.

Frequently Asked Questions (FAQ)

Q: Can the SMAJ4741A-TP directly replace the 1SMA4741 in an existing circuit?

A: Yes. Both devices share identical zener voltage (11 V), tolerance (±5%), power rating (1 W), impedance (8 Ohms), reverse leakage current (5 µA @ 8.4 V), operating temperature range (-65°C to 150°C), and package type (DO-214AC, SMA). Direct substitution is electrically and mechanically compatible.

Q: What is the significance of the ±5% tolerance specification?

A: The ±5% tolerance defines the acceptable range of zener voltage around the 11 V nominal value. Both the 1SMA4741 and SMAJ4741A-TP maintain this tolerance, ensuring voltage regulation performance remains within design specifications across production lots and operating conditions.

Q: Are there differences in forward voltage characteristics between these parts?

A: The 1SMA4741 specifies forward voltage at 200 mA, while the SMAJ4741A-TP specifies it at 100 mA. Both maintain the 1.2 V maximum forward voltage rating. The difference in test current does not affect substitution compatibility, as the maximum forward voltage specification is equivalent.

Q: Do both parts meet the same regulatory requirements?

A: Both the 1SMA4741 and SMAJ4741A-TP are ROHS3 compliant. The 1SMA4741 is REACH Affected; the SMAJ4741A-TP is REACH Unaffected. Regulatory compliance should be verified against specific end-use market requirements.

Q: Is the DO-214AC package identical to the SMA package?

A: DO-214AC and SMA refer to the same surface mount package form factor. Both designations are used interchangeably in the industry. Devices specified as DO-214AC (SMA) are mechanically and electrically compatible with circuit board layouts designed for either designation.

Q: What determines whether a zener diode can substitute for another?

A: Substitution is determined by matching zener voltage, tolerance, maximum power rating, impedance, reverse leakage current, forward voltage characteristics, operating temperature range, and package type. All these parameters must align between the original and substitute part to ensure functional equivalence.