SMAJ5939B-TP Equivalent & Substitute Parts

Part Overview

The SMAJ5939B-TP is a surface mount Zener diode manufactured by Micro Commercial Co, rated at 39 V nominal Zener voltage with 1.5 W maximum power dissipation in a DO-214AC (SMA) package. This component is classified as Active product status and is RoHS3 compliant. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, supply chain considerations, or design flexibility needs while maintaining the same functional specifications.

Substiute Parts

SMAJ5939B-TP

Micro Commercial CoIn Stock: 814SMAJ5939B-TP Datasheet

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CMZ5939B TR13 PBFREE

Central Semiconductor CorpIn Stock: 3545CMZ5939B TR13 PBFREE Datasheet

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SMAZ39-13-F

Diodes IncorporatedIn Stock: 30579SMAZ39-13-F Datasheet

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SZ1SMA5939BT3G

onsemiIn Stock: 3140SZ1SMA5939BT3G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMAJ5939B-TP is determined by strict equivalence in the following critical parameters:

Primary Substitution Criteria:

• Voltage - Zener (Nom): 39 V (exact match required)
• Tolerance: ±5% (exact match required)
• Package / Case: DO-214AC, SMA (mechanical compatibility)
• Mounting Type: Surface Mount (assembly compatibility)
• RoHS Status: ROHS3 Compliant (regulatory compliance)

Secondary Compatibility Parameters:

• Power - Max: 1.5 W or greater (equal or higher rating acceptable)
• Impedance (Max): 45 Ohms or lower (equal or lower acceptable)
• Current - Reverse Leakage @ Vr: 500 nA or lower (equal or lower acceptable)
• Voltage - Forward (Vf) (Max) @ If: 1.5 V or lower (equal or lower acceptable)
• Operating Temperature: -65°C to 150°C range (equal or wider range acceptable)

All identified substitute parts meet or exceed these criteria while maintaining functional equivalence in 39 V Zener diode applications.

Parameter Comparison

Engineering Selection Recommendations

SMAJ5939B-TP (Micro Commercial Co) — Primary Part

Use as the primary selection when available. Active product status with full compliance to ROHS3 and REACH standards. Rated for 1.5 W maximum power dissipation with 150°C operating temperature capability.

SZ1SMA5939BT3G (onsemi) — Preferred Substitute

Direct electrical and mechanical equivalent to the primary part. Identical power rating (1.5 W), impedance (45 Ohms), reverse leakage (500 nA @ 29.7 V), and forward voltage (1.5 V @ 200 mA). Extends operating temperature range to -65°C to 150°C. Carries AEC-Q101 automotive qualification and Automotive grade designation. ROHS3 compliant. Suitable for applications requiring automotive-grade reliability or extended low-temperature operation.

SMAZ39-13-F (Diodes Incorporated) — Secondary Substitute

Electrical equivalent with reduced power rating (1 W versus 1.5 W). Impedance is lower (40 Ohms versus 45 Ohms) and forward voltage is lower (1.2 V @ 200 mA versus 1.5 V @ 200 mA). Reverse leakage matches at 500 nA. Extended operating temperature range (-65°C to 150°C). ROHS3 compliant. Suitable for applications where 1 W power dissipation is sufficient and lower forward voltage is beneficial.

CMZ5939B TR13 PBFREE (Central Semiconductor) — Limited Substitute

Electrical equivalent with reduced power rating (500 mW versus 1.5 W). Impedance matches at 45 Ohms. Reverse leakage is higher (1 µA @ 29.7 V versus 500 nA @ 29.7 V). Forward voltage matches at 1.5 V @ 200 mA. Extended operating temperature range (-65°C to 150°C). ROHS3 compliant. Suitable only for applications where 500 mW power dissipation is sufficient and higher reverse leakage is acceptable.

Frequently Asked Questions (FAQ)

Q: Can CMZ5939B TR13 PBFREE be used as a direct replacement for SMAJ5939B-TP?

A: CMZ5939B TR13 PBFREE is mechanically compatible and shares the same 39 V Zener voltage and ±5% tolerance. However, the power rating is reduced from 1.5 W to 500 mW, and reverse leakage current is higher (1 µA versus 500 nA). Use only in applications where the lower power dissipation rating and higher leakage current are acceptable.

Q: What is the difference between SMAZ39-13-F and SMAJ5939B-TP?

A: Both parts are 39 V Zener diodes in DO-214AC (SMA) packages with ±5% tolerance and ROHS3 compliance. SMAZ39-13-F has a lower power rating (1 W versus 1.5 W), lower impedance (40 Ohms versus 45 Ohms), and lower forward voltage (1.2 V versus 1.5 V). The operating temperature range is extended to -65°C to 150°C. Select SMAZ39-13-F when 1 W power dissipation is sufficient.

Q: Is SZ1SMA5939BT3G suitable for automotive applications?

A: Yes. SZ1SMA5939BT3G carries AEC-Q101 qualification and Automotive grade designation. It is electrically and mechanically equivalent to SMAJ5939B-TP with identical 1.5 W power rating, 45 Ohms impedance, and 500 nA reverse leakage. Extended operating temperature range (-65°C to 150°C) supports automotive environmental requirements.

Q: Are all substitute parts in the same package?

A: Yes. All substitute parts use the DO-214AC (SMA) surface mount package, ensuring mechanical compatibility with SMAJ5939B-TP in PCB assembly.

Q: Do all parts meet RoHS3 compliance?

A: Yes. SMAJ5939B-TP, CMZ5939B TR13 PBFREE, SMAZ39-13-F, and SZ1SMA5939BT3G are all ROHS3 compliant and REACH unaffected.

Q: What is the moisture sensitivity level for these parts?

A: All parts have Moisture Sensitivity Level (MSL) 1, indicating unlimited shelf life without moisture control requirements.

Q: Can I use SMAZ39-13-F in a high-power application requiring 1.5 W dissipation?

A: No. SMAZ39-13-F is rated for 1 W maximum power dissipation. Use SZ1SMA5939BT3G or SMAJ5939B-TP for applications requiring 1.5 W dissipation capability.