1SMA5926 Zener Diode Equivalent & Substitute Parts

Part Overview

The 1SMA5926 is an 11 V, 1.5 W surface mount zener diode manufactured by Taiwan Semiconductor Corporation in DO-214AC (SMA) packaging. This component is designed for voltage regulation and protection applications in electronic circuits. The part is Active status and RoHS3 compliant, with unlimited moisture sensitivity level (MSL 1).

Alternative equivalent and substitute parts are necessary to address supply chain availability, manufacturer preferences, performance optimization, or specific application requirements while maintaining electrical and mechanical compatibility.

Substiute Parts

1SMA5926

Taiwan Semiconductor CorporationIn Stock: 55921SMA5926 Datasheet

Current PartRFQ

1SMA5926BT3G

onsemiIn Stock: 101441SMA5926BT3G Datasheet

UpgradeRFQ

SMAJ5926B-TP

Micro Commercial CoIn Stock: 9447SMAJ5926B-TP Datasheet

UpgradeRFQ

1SMA5926_R1_00001

Panjit International Inc.In Stock: 28751SMA5926_R1_00001 Datasheet

SimilarRFQ

3SMAJ5926B-TP

Micro Commercial CoIn Stock: 70733SMAJ5926B-TP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of zener diodes is determined by strict equivalence of the following electrical and mechanical parameters:

Critical Parameters for Direct Substitution:

• Voltage - Zener (Nominal): Must equal 11 V
• Tolerance: Must equal ±5%
• Power - Maximum: Must equal or exceed 1.5 W
• Package / Case: Must be DO-214AC (SMA) or compatible surface mount package
• Mounting Type: Must be Surface Mount
• RoHS Status: Must be ROHS3 Compliant

Secondary Parameters for Compatibility Assessment:

• Impedance (Maximum): Acceptable range 5.5 Ohms or lower
• Current - Reverse Leakage @ Vr: Must not exceed 500 nA @ 8.4 V
• Operating Temperature Range: Must encompass or match -55°C to 150°C

Parts are classified as Upgrade when all critical parameters match and secondary parameters equal or exceed the main part specifications. Parts are classified as Similar when one or more secondary parameters differ while maintaining functional compatibility.

Parameter Comparison

Engineering Selection Recommendations

Upgrade Parts (Direct Equivalents):

The parts 1SMA5926BT3G (onsemi) and SMAJ5926B-TP (Micro Commercial Co) are classified as upgrades. Both maintain identical electrical specifications to the main part 1SMA5926 across all critical parameters. The 1SMA5926BT3G offers an extended lower operating temperature limit of -65°C compared to -55°C, providing enhanced performance in low-temperature environments. Both upgrade parts are Active status and RoHS3 compliant, suitable for direct substitution in applications requiring the 1SMA5926.

Similar Parts (Functional Alternatives):

The part 1SMA5926_R1_00001 (Panjit International Inc.) maintains identical zener voltage, tolerance, and power rating but exhibits higher impedance (6 Ohms versus 5.5 Ohms) and increased reverse leakage current (1 µA versus 500 nA). This part remains functionally compatible for applications where these parameter variations are acceptable.

The part 3SMAJ5926B-TP (Micro Commercial Co) provides doubled power dissipation capability (3 W versus 1.5 W) while maintaining the same zener voltage and impedance. This part is suitable for applications requiring higher power handling capacity. The increased reverse leakage current (1 µA) is a secondary consideration in this configuration.

All substitute parts are Active status, RoHS3 compliant, and packaged in DO-214AC (SMA) surface mount format, ensuring mechanical and regulatory compatibility with the main part.

Frequently Asked Questions (FAQ)

Q: Can 1SMA5926BT3G replace 1SMA5926 in all applications?

A: Yes. The 1SMA5926BT3G maintains identical electrical specifications across all critical parameters: 11 V zener voltage, ±5% tolerance, 1.5 W power rating, 5.5 Ohms maximum impedance, and 500 nA reverse leakage current. The extended temperature range (-65°C to 150°C versus -55°C to 150°C) provides additional operational margin. Both parts use DO-214AC (SMA) packaging and are RoHS3 compliant.

Q: What is the difference between upgrade and similar classifications?

A: Upgrade parts match all critical electrical and mechanical parameters of the main part with equal or superior secondary specifications. Similar parts maintain functional compatibility but exhibit variations in one or more secondary parameters such as impedance, reverse leakage current, or power rating. Similar parts require application-specific evaluation to confirm suitability.

Q: Can 3SMAJ5926B-TP be used as a direct replacement for 1SMA5926?

A: The 3SMAJ5926B-TP is functionally compatible but not a direct replacement. While both maintain 11 V zener voltage and ±5% tolerance, the 3SMAJ5926B-TP provides 3 W power dissipation versus 1.5 W. This higher power rating makes it suitable for applications requiring greater thermal capacity. The increased reverse leakage current (1 µA versus 500 nA) must be evaluated against specific circuit requirements. Both parts use DO-214AC (SMA) packaging.

Q: Are all substitute parts available in the same packaging?

A: Yes. All listed substitute parts use DO-214AC (SMA) surface mount packaging, ensuring mechanical compatibility with the main part 1SMA5926. Supplier device packages may be designated as "SMA" or "DO-214AC (SMA)" but refer to the same physical form factor.

Q: What compliance certifications apply to these parts?

A: All parts listed—main and substitutes—are RoHS3 compliant, REACH unaffected, and classified under ECCN EAR99. All parts carry Moisture Sensitivity Level 1 (MSL 1), indicating unlimited shelf life under standard storage conditions. These certifications ensure regulatory compliance across industrial and commercial applications.

Q: How do impedance differences affect circuit performance?

A: Impedance (Zzt) affects the dynamic response of the zener diode to transient voltage changes. The main part 1SMA5926 specifies 5.5 Ohms maximum impedance. The similar part 1SMA5926_R1_00001 specifies 6 Ohms, representing a 9% increase. This difference is negligible in most voltage regulation applications but may affect high-frequency transient suppression performance. Applications requiring precise impedance specifications should confirm compatibility with circuit simulation or testing.

Q: What does reverse leakage current specification indicate?

A: Reverse leakage current (measured at 8.4 V in this case) indicates the small current flowing through the zener diode when reverse biased below the zener voltage. The main part 1SMA5926 specifies 500 nA maximum. Similar parts 1SMA5926_R1_00001 and 3SMAJ5926B-TP specify 1 µA maximum, representing a 2x increase. Higher leakage current increases standby power consumption in voltage regulation circuits. Applications with strict power budget requirements should prioritize parts with lower leakage specifications.