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SD12CT1G Equivalent & Substitute Parts
Part Overview
The SD12CT1G is a 12V Transient Voltage Suppressor (TVS) diode manufactured by onsemi in SOD-323 surface mount package. This bidirectional Zener diode provides transient overvoltage protection with a 19V clamping voltage and 5A peak pulse current rating (8/20µs). The device is qualified to AEC-Q101 automotive standards and carries ROHS3 compliance.
The SD12CT1G is classified as "Not For New Designs," indicating end-of-life status. Equivalent and substitute parts are necessary for ongoing production support, design revisions, and inventory management where the original part is no longer available or procurement becomes constrained.
Substiute Parts
Key Parameters
| Parameter | SD12CT1G |
|---|---|
| Voltage - Reverse Standoff (Typ) | 12V (Max) |
| Voltage - Breakdown (Min) | 13.3V |
| Voltage - Clamping (Max) @ Ipp | 19V |
| Current - Peak Pulse (8/20µs) | 5A |
| Power - Peak Pulse | 350W |
| Package / Case | SC-76, SOD-323 |
| Operating Temperature | -65°C ~ 150°C (TJ) |
| Capacitance @ 1MHz | 64pF |
| Grade | Automotive |
| Qualification | AEC-Q101 |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution eligibility for the SD12CT1G is determined by the following critical parameters:
- Voltage - Reverse Standoff: 12V (Max)
- Voltage - Breakdown (Min): 13.3V or higher
- Voltage - Clamping (Max) @ Ipp: 19V or lower
- Current - Peak Pulse (8/20µs): 5A or higher
- Package / Case: SOD-323 (SC-76)
- Mounting Type: Surface Mount
- RoHS Status: ROHS3 Compliant
Substitute parts are grouped into two categories:
Direct Substitutes: Parts meeting all critical electrical parameters within the specified tolerances, maintaining identical functional performance and package compatibility.
Similar Substitutes: Parts with the same reverse standoff voltage and SOD-323 package but with variations in clamping voltage, peak pulse current, or power dissipation. These parts are functionally compatible but may have different performance characteristics in specific circuit applications.
Parameter Comparison
| Part Number | Manufacturer | Voltage - Reverse Standoff | Voltage - Breakdown (Min) | Voltage - Clamping (Max) @ Ipp | Current - Peak Pulse (8/20µs) | Power - Peak Pulse | Package | Product Status | Operating Temperature |
|---|---|---|---|---|---|---|---|---|---|
| SD12CT1G | onsemi | 12V (Max) | 13.3V | 19V | 5A | 350W | SOD-323 | Not For New Designs | -65°C ~ 150°C (TJ) |
| ESD12VD3B-TP | Micro Commercial Co | 12V (Max) | 14.6V | 15.5V | 1A | 350W | SOD-323 | Active | -55°C ~ 150°C (TJ) |
| PESD12VL1BA,115 | Nexperia USA Inc. | 12V (Max) | 14.2V | 37V | 5A | 200W | SOD-323 | Active | -65°C ~ 150°C (TA) |
| CDSOD323-T12C | Bourns Inc. | 12V | 13.3V | 28.3V (Typ) | 11A | 350W | SOD-323 | Active | -55°C ~ 150°C (TJ) |
| CDSOD323-T12C-DSL | Bourns Inc. | 12V | 13.3V | 28.3V (Typ) | 11A | 350W | SOD-323 | Active | -55°C ~ 150°C (TJ) |
| CDSOD323-T12SC | Bourns Inc. | 12V | 13.3V | 29.5V (Typ) | 14A | 400W | SOD-323 | Active | -55°C ~ 150°C (TJ) |
| CPDF12V | Comchip Technology | 12V | 13V | 25V | 1A | 25W | 1005 (2512 Metric) | Active | - |
| ESDLIN1524BJ-HQ | STMicroelectronics | 50V | 25.4V | 40V | 50A | 160W | SOD-323 | Active | -40°C ~ 150°C (TJ) |
| SD12C-01FTG | Littelfuse Inc. | 12V (Max) | - | 23V | 17A | 450W | SOD-323 | Active | -40°C ~ 125°C (TJ) |
| SD12C.TCT | Semtech Corporation | 12V (Max) | 13.3V | 24V | 15A | 350W | SOD-323 | Active | -55°C ~ 125°C (TJ) |
| SP12-01WTG-C-HV | Littelfuse Inc. | 12V (Max) | 13.3V | 19V | 8A | 100W | 2-XFDFN, FCDFN | Active | -40°C ~ 125°C (TJ) |
Engineering Selection Recommendations
Direct Substitutes (Recommended for Replacement):
ESD12VD3B-TP and PESD12VL1BA,115 maintain the 12V reverse standoff voltage and SOD-323 package required for direct pin-compatible replacement. Both parts are Active status with ROHS3 compliance. ESD12VD3B-TP operates within the same temperature range as the original (-55°C to 150°C). PESD12VL1BA,115 extends the lower operating temperature to -65°C, matching the original SD12CT1G specification.
Similar Substitutes (Application-Dependent Selection):
CDSOD323-T12C, CDSOD323-T12C-DSL, and CDSOD323-T12SC (Bourns) provide higher peak pulse current ratings (11A and 14A respectively) with increased power dissipation capability (350W and 400W). These parts are suitable for applications requiring enhanced transient suppression performance while maintaining the 12V reverse standoff voltage and SOD-323 package.
SD12C-01FTG (Littelfuse) and SD12C.TCT (Semtech) offer 12V reverse standoff voltage with higher peak pulse current ratings (17A and 15A) and are qualified to AEC-Q101 automotive standards. SD12C-01FTG maintains the -40°C to 125°C operating range typical of automotive applications.
SP12-01WTG-C-HV (Littelfuse) provides identical 19V clamping voltage and 12V reverse standoff voltage but uses a 2-FlipChip package instead of SOD-323. This part is not pin-compatible and requires PCB layout modification.
Parts Not Recommended for Direct Substitution:
CPDF12V uses a 1005 (2512 Metric) package, incompatible with SOD-323 footprints. ESDLIN1524BJ-HQ operates at 50V reverse standoff voltage, exceeding the 12V specification and unsuitable for this application.
Frequently Asked Questions (FAQ)
Q: Can ESD12VD3B-TP replace SD12CT1G in all applications?
A: ESD12VD3B-TP is pin-compatible in SOD-323 package and maintains the 12V reverse standoff voltage. However, its peak pulse current rating is 1A compared to the original 5A. Substitution is valid only for applications where the lower current rating is acceptable. Verify circuit transient suppression requirements before selection.
Q: What is the difference between Direct and Similar substitutes?
A: Direct substitutes maintain all critical electrical parameters (reverse standoff voltage, clamping voltage, peak pulse current, and package) within acceptable tolerances. Similar substitutes share the 12V reverse standoff voltage and SOD-323 package but differ in clamping voltage or peak pulse current, offering alternative performance characteristics for specific circuit requirements.
Q: Why is ESDLIN1524BJ-HQ listed if it cannot replace SD12CT1G?
A: ESDLIN1524BJ-HQ is included in the provided substitute list but operates at 50V reverse standoff voltage, fundamentally incompatible with the 12V specification. It is not suitable for direct or functional replacement in circuits designed for 12V protection.
Q: Can SP12-01WTG-C-HV be used as a substitute?
A: SP12-01WTG-C-HV matches the 19V clamping voltage and 12V reverse standoff voltage but uses a 2-FlipChip package instead of SOD-323. Direct PCB substitution is not possible without layout redesign. Electrical performance is compatible if package change is feasible.
Q: What are the key parameters to verify when selecting a substitute?
A: Verify reverse standoff voltage (12V), breakdown voltage (13.3V minimum), clamping voltage (19V or lower for direct substitutes), peak pulse current (5A or higher), package type (SOD-323 for pin compatibility), and operating temperature range (-65°C to 150°C for full compatibility). Confirm RoHS3 compliance for regulatory requirements.
Q: Are all listed substitutes ROHS3 compliant?
A: All substitute parts listed are ROHS3 compliant, meeting environmental and regulatory requirements equivalent to the original SD12CT1G.
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