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SD05T1 Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts
Part Overview
The SD05T1 is a unidirectional Zener TVS diode in SOD-323 surface mount package, rated for 5V reverse standoff voltage with 9.8V maximum clamping voltage and 24A peak pulse current (8/20µs). Manufactured by onsemi, this component is classified as obsolete product status. Due to obsolescence, equivalent substitute parts with matching or superior electrical characteristics and active product status are necessary for new designs and ongoing production requirements.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Reverse Standoff (Typ) | 5 | V |
| Voltage - Breakdown (Min) | 6.2 | V |
| Voltage - Clamping (Max) @ Ipp | 9.8 | V |
| Current - Peak Pulse (8/20µs) | 24 | A |
| Power - Peak Pulse | 350 | W |
| Capacitance @ 1MHz | 350 | pF |
| Operating Temperature Range | -55 to 150 | °C (TJ) |
| Package / Case | SC-76, SOD-323 | — |
| Mounting Type | Surface Mount | — |
| RoHS Status | RoHS non-compliant | — |
Substitute Part Grouping Explanation
Substitution of the SD05T1 is determined by the following critical parameters:
- Reverse Standoff Voltage: 5V nominal (determines circuit protection threshold)
- Clamping Voltage: Maximum 9.8V at peak pulse current (defines transient suppression level)
- Peak Pulse Current: Minimum 24A at 8/20µs waveform (establishes surge handling capability)
- Package: SOD-323 surface mount (mechanical and thermal compatibility)
- Operating Temperature: -55°C to 150°C (thermal operating envelope)
Substitute parts are grouped into two categories:
Direct Equivalents maintain all critical electrical parameters within the SD05T1 specification envelope. These parts provide identical functional performance and are pin-compatible replacements.
Functional Alternatives share the 5V reverse standoff voltage and SOD-323 package but may vary in clamping voltage, peak pulse current, or power dissipation. These parts are suitable when the application can tolerate different transient suppression characteristics or when superior performance is acceptable.
Parameter Comparison
| Part Number | Manufacturer | Standoff Voltage (V) | Breakdown Min (V) | Clamp Voltage (V) | Peak Pulse Current (A) | Power (W) | Package | Product Status | RoHS |
|---|---|---|---|---|---|---|---|---|---|
| SD05T1 | onsemi | 5 | 6.2 | 9.8 | 24 | 350 | SOD-323 | Obsolete | Non-compliant |
| SD05T1G | onsemi | 5 | 6.2 | 9.8 | 24 | 350 | SOD-323 | Active | ROHS3 Compliant |
| CDSOD323-T05 | Bourns Inc. | 5 | 6 | 18.3 | 17 | 350 | SOD-323 | Active | ROHS3 Compliant |
| CDSOD323-T05L | Bourns Inc. | 5 | 6 | 18.3 | 15 | 350 | SOD-323 | Active | ROHS3 Compliant |
| CDSOD323-T05S | Bourns Inc. | 5 | 6 | 14.6 | 42 | 500 | SOD-323 | Active | ROHS3 Compliant |
| ESDA8V2-1J | STMicroelectronics | 5 | 8.2 | 20 | 25 | 500 | SOD-323 | Active | ROHS3 Compliant |
| PESD5V0L1UA,115 | Nexperia USA Inc. | 5 | 6.4 | 12 | 4.6 | 42 | SOD-323 | Active | ROHS3 Compliant |
| PESD5V0S1UA,115 | Nexperia USA Inc. | 5 | 6.2 | 19 | 47 | 890 | SOD-323 | Active | ROHS3 Compliant |
| PESD5V0U1UA,115 | Nexperia USA Inc. | 5 | 5.8 | — | — | — | SOD-323 | Active | ROHS3 Compliant |
| SD05-01FTG | Littelfuse Inc. | 5 | — | 16.8 | 30 | 450 | SOD-323 | Active | ROHS3 Compliant |
| B72570D0120A060 | EPCOS - TDK Electronics | 12 | 16 | — | 20 | — | 1003 (2508 Metric) | Active | ROHS3 Compliant |
Engineering Selection Recommendations
Primary Recommendation: SD05T1G (onsemi)
SD05T1G is the direct equivalent replacement for SD05T1. It maintains identical electrical specifications (5V standoff, 9.8V clamp, 24A peak pulse current, 350W power) and SOD-323 package compatibility. SD05T1G holds active product status with ROHS3 compliance, addressing the obsolescence and regulatory requirements of the original part. This is the preferred substitution path for existing designs.
Secondary Recommendations for Enhanced Performance:
PESD5V0S1UA,115 (Nexperia) provides superior surge handling with 47A peak pulse current and 890W power dissipation while maintaining 5V standoff voltage and SOD-323 package. This part includes AEC-Q101 automotive qualification and ROHS3 compliance, suitable for applications requiring higher transient energy absorption.
CDSOD323-T05S (Bourns) offers 42A peak pulse current and 500W power dissipation with 5V standoff voltage in SOD-323 package. ROHS3 compliant and active status make this suitable for general-purpose applications with moderate surge requirements.
Not Recommended:
PESD5V0L1UA,115 (Nexperia) has significantly reduced peak pulse current (4.6A) and power dissipation (42W), making it unsuitable for the SD05T1 application envelope.
B72570D0120A060 (EPCOS - TDK) is a varistor with 12V maximum DC voltage and 16V varistor voltage, fundamentally different from the 5V TVS diode specification. Package format (1003 Metric) is incompatible with SOD-323 requirements.
Frequently Asked Questions (FAQ)
Q: Can SD05T1G be used as a direct drop-in replacement for SD05T1?
A: Yes. SD05T1G is electrically and mechanically identical to SD05T1, with matching 5V standoff voltage, 9.8V clamping voltage, 24A peak pulse current, and SOD-323 package. The primary difference is active product status and ROHS3 compliance versus the obsolete, non-compliant original part.
Q: What is the difference between clamping voltage and standoff voltage?
A: Standoff voltage (5V) is the maximum reverse voltage the diode blocks without conducting. Clamping voltage (9.8V for SD05T1) is the maximum voltage across the diode during a transient surge at peak pulse current. Lower clamping voltage provides better transient suppression.
Q: Can I use PESD5V0S1UA,115 instead of SD05T1?
A: Yes, with application verification. PESD5V0S1UA,115 shares the 5V standoff voltage and SOD-323 package but has higher clamping voltage (19V) and significantly higher peak pulse current (47A) and power dissipation (890W). This part is suitable if your circuit can tolerate higher transient voltage levels or if enhanced surge protection is beneficial. AEC-Q101 qualification provides automotive-grade reliability.
Q: Why is the B72570D0120A060 varistor not suitable?
A: B72570D0120A060 is a varistor with fundamentally different electrical characteristics (12V maximum DC voltage, 16V varistor voltage) and operates on different physical principles than the 5V TVS diode. Additionally, the 1003 (2508 Metric) package is mechanically incompatible with SOD-323 footprints.
Q: What does ROHS3 compliance mean for my design?
A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. If your design or market requires regulatory compliance, ROHS3-compliant substitutes (such as SD05T1G) are necessary.
Q: Are there automotive-grade alternatives available?
A: Yes. PESD5V0S1UA,115 and PESD5V0L1UA,115 (Nexperia) both carry AEC-Q101 automotive qualification. PESD5V0S1UA,115 is recommended for automotive applications requiring higher surge capacity, while PESD5V0L1UA,115 is limited to lower current applications.
Q: What is the significance of peak pulse current rating?
A: Peak pulse current (24A for SD05T1) defines the maximum surge current the diode can safely conduct during an 8/20µs transient event. Higher ratings indicate greater surge handling capability. Substitutes with equal or higher ratings maintain or improve protection performance.
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