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SM6T39A-M3/5B Equivalent & Substitute Parts
Part Overview
The SM6T39A-M3/5B is a unidirectional transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This component operates as a Zener-type TVS device in the SM6T series, utilizing the TransZorb® technology platform. The part is actively produced and widely deployed in general-purpose transient protection applications requiring surface-mount integration in the DO-214AA (SMB) package format.
Equivalent and substitute parts are identified when component availability is constrained, supply chain disruptions occur, or design flexibility permits alternative manufacturers while maintaining electrical and mechanical compatibility within specified parameter tolerances.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Reverse Standoff (Typ) | 33.3 | V |
| Voltage - Breakdown (Min) | 37.1 | V |
| Voltage - Clamping (Max) @ Ipp | 53.9 | V |
| Current - Peak Pulse (10/1000µs) | 11.1 | A |
| Power - Peak Pulse | 600 | W |
| Operating Temperature Range | -65 to 150 | °C (TJ) |
| Package / Case | DO-214AA, SMB | — |
| Mounting Type | Surface Mount | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitution eligibility for the SM6T39A-M3/5B is determined by strict alignment across the following critical parameters:
- Voltage Rating: Reverse standoff voltage of 33.3V, breakdown minimum of 37.1V, and clamping voltage maximum of 53.9V must be maintained
- Current Handling: Peak pulse current rating of 10/1000µs pulse must be 11.1A or greater
- Power Dissipation: Peak pulse power rating must be 600W or greater
- Package Compatibility: DO-214AA (SMB) surface-mount package required
- Temperature Range: Operating temperature must span -65°C to 150°C minimum; extended ranges are acceptable
- Compliance: ROHS3 compliance and MSL 1 rating required
All identified substitute parts meet or exceed these parameters. Variations in peak pulse current (11.1A to 18.6A) and power dissipation (600W to 1000W) represent enhanced performance margins and remain functionally compatible.
Parameter Comparison
| Part Number | Manufacturer | Voltage - Reverse Standoff (V) | Voltage - Breakdown Min (V) | Voltage - Clamping Max (V) | Current - Peak Pulse (A) | Power - Peak Pulse (W) | Temp Range (°C) | Package | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|
| SM6T39A-M3/5B | Vishay | 33.3 | 37.1 | 53.9 | 11.1 | 600 | -65 to 150 | DO-214AA (SMB) | ROHS3 |
| P6SMB39A-E3/52 | Vishay | 33.3 | 37.1 | 53.9 | 11.1 | 600 | -65 to 150 | DO-214AA (SMB) | ROHS3 |
| 1KSMB39A | Taiwan Semiconductor Corporation | 33.3 | 37.1 | 53.9 | 18.6 | 1000 | -55 to 175 | DO-214AA (SMB) | ROHS3 |
| P6SMB39A | Eaton - Electronics Division | 33.3 | 37.1 | 53.9 | 11.3 | 600 | -55 to 150 | DO-214AA (SMB) | RoHS |
| SMBJP6KE39A-TP | Micro Commercial Co | 33.3 | 37.1 | 53.9 | 11.3 | 600 | -55 to 175 | DO-214AA (SMBJ) | ROHS3 |
| SZP6SMB39AT3G | Littelfuse | 33.3 | 37.1 | 53.9 | 11.2 | 600 | -65 to 150 | DO-214AA (SMB) | ROHS3 |
| TPSMB39A | Littelfuse Inc. | 33.3 | 37.1 | 53.9 | 11.3 | 600 | -65 to 175 | DO-214AA (SMBJ) | ROHS3 |
Engineering Selection Recommendations
Direct Equivalent (Identical Specifications)
P6SMB39A-E3/52 from Vishay is the direct equivalent to SM6T39A-M3/5B, matching all electrical parameters and operating temperature range. Both parts carry ROHS3 compliance and MSL 1 rating. This substitution requires no design modification.
Enhanced Performance Alternatives
1KSMB39A from Taiwan Semiconductor Corporation provides enhanced current handling (18.6A versus 11.1A) and power dissipation (1000W versus 600W), with extended upper operating temperature to 175°C. This part is suitable for applications requiring higher transient energy absorption margins.
Compatible Substitutes (Equivalent Electrical Performance)
SZP6SMB39AT3G from Littelfuse matches the SM6T39A-M3/5B across all critical voltage and current parameters. This part carries AEC-Q101 automotive qualification and is suitable for automotive-grade applications.
TPSMB39A from Littelfuse Inc. provides equivalent electrical performance with extended upper operating temperature to 175°C and AEC-Q101 automotive qualification.
SMBJP6KE39A-TP from Micro Commercial Co maintains electrical equivalence with extended upper operating temperature to 175°C and ROHS3 compliance.
P6SMB39A from Eaton - Electronics Division provides equivalent electrical performance with a minimum operating temperature of -55°C (versus -65°C on the primary part).
Product Status Consideration
All substitute parts maintain Active product status, ensuring continued availability and manufacturing support.
Frequently Asked Questions (FAQ)
Q: Can P6SMB39A-E3/52 be used as a direct replacement for SM6T39A-M3/5B?
A: Yes. P6SMB39A-E3/52 is electrically and mechanically identical to SM6T39A-M3/5B. Both parts share identical voltage ratings (33.3V standoff, 53.9V clamping), current handling (11.1A peak pulse), power dissipation (600W), operating temperature range (-65°C to 150°C), and package format (DO-214AA SMB). No design changes are required.
Q: What is the difference between the SM6T39A-M3/5B and 1KSMB39A?
A: The 1KSMB39A provides enhanced performance specifications. It handles higher peak pulse current (18.6A versus 11.1A) and greater power dissipation (1000W versus 600W). The upper operating temperature extends to 175°C compared to 150°C. Voltage ratings remain identical. The 1KSMB39A is suitable for applications requiring higher transient energy absorption capacity.
Q: Are automotive-qualified alternatives available?
A: Yes. Both SZP6SMB39AT3G and TPSMB39A carry AEC-Q101 automotive qualification. These parts maintain electrical equivalence to SM6T39A-M3/5B while meeting automotive-grade reliability standards.
Q: Does package format vary among substitute parts?
A: All substitute parts use the DO-214AA (SMB) package family. Minor designations such as SMBJ indicate internal lead configuration variations but do not affect mechanical compatibility or PCB footprint. All parts are surface-mount compatible in standard SMB landing patterns.
Q: What is the minimum operating temperature requirement for substitute selection?
A: The SM6T39A-M3/5B operates from -65°C. Substitute parts P6SMB39A and SMBJP6KE39A-TP have minimum operating temperatures of -55°C. If the application requires operation below -55°C, select SZP6SMB39AT3G, TPSMB39A, or 1KSMB39A, which maintain the -65°C minimum or lower.
Q: Are all substitute parts ROHS3 compliant?
A: All identified substitute parts carry ROHS3 compliance except P6SMB39A from Eaton, which carries standard RoHS compliance. For applications requiring ROHS3 certification, select from P6SMB39A-E3/52, 1KSMB39A, SMBJP6KE39A-TP, SZP6SMB39AT3G, or TPSMB39A.
Q: What is the significance of the capacitance specification on SZP6SMB39AT3G?
A: SZP6SMB39AT3G specifies 500pF capacitance at 1MHz. This parameter is not provided for other parts in this comparison. The capacitance value does not affect substitution eligibility for transient voltage suppression applications and remains within typical ranges for this device category.
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