SM15T56AY - 56V 1500W TVS Diode | STMicroelectronics | Automotive
MPN: SM15T56AY ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.45 | $0.45 |
| 10 | $0.38 | $3.80 |
| 100 | $0.3 | $30.00 |
| 500 | $0.25 | $125.00 |
| 1,000 | $0.21 | $210.00 |
Drop-in alternatives for SM15T56AY — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
SM15T56A
✅ Drop-In📋 Reference alternative (not in catalog)
SM15T56AY-TR
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SMCJ56A
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1.5SMC56A
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SMDJ56A
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SM15T56AY Maximum Ratings & Electrical Characteristics
| Type | TVS Diode (Unidirectional) |
| Working Peak Reverse Voltage (VRWM) | 56 V |
| Breakdown Voltage (VBR) Min | 62.2 V |
| Breakdown Voltage (VBR) Max | 68.8 V |
| Test Current (IT) | 1 mA |
| Maximum Clamping Voltage (VC) at IPP | 100 V |
| Peak Pulse Current (IPP) 10/1000μs | 15.4 A |
| Peak Pulse Power (PPP) 10/1000μs | 1500 W |
| Leakage Current (IR) at VRWM | 5 μA (max) |
| Response Time | < 1 ps (theoretical) |
| Package | SMC (DO-214AB) |
| Mounting Type | Surface Mount |
| Operating Temperature Range | -55°C to +150°C |
| AEC-Q101 Qualified | Yes |
| RoHS Compliant | Yes |
| REACH Compliant | Yes |
SM15T56AY Pin Configuration
| Pin 1 | Cathode — Connected to positive rail (marked with band) |
| Pin 2 | Anode — Connected to ground |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
SM15T56AY is suitable for 6 applications: Automotive Electronic Control Units (ECUs), Industrial Power Supplies, Telecommunications Equipment, Consumer Electronics, Renewable Energy Systems, LED Lighting.
Automotive Electronic Control Units (ECUs)
The SM15T56AY protects automotive ECUs from load-dump transients and inductive spikes on 12V and 24V battery lines. Its 1500W surge capability and AEC-Q101 qualification ensure reliable operation in harsh automotive environments. In a typical ECU power input, the TVS diode is placed across the battery line after the reverse polarity protection, clamping transients to safe levels before they reach the microcontroller and other sensitive ICs. The device's fast response time (<1ps) ensures that even fast transients are clamped effectively, preventing damage to the ECU's power management circuitry. The 56V standoff voltage provides adequate margin above the normal 12V or 24V operating voltage, while the 100V clamping voltage protects components rated up to 100V. Designers must ensure the TVS diode is placed close to the connector to minimize parasitic inductance, which can degrade clamping performance.
Recommended
Industrial Power Supplies
In industrial power supplies, the SM15T56AY protects against surge events caused by lightning, inductive load switching, and grid disturbances. Its 1500W peak pulse power rating allows it to absorb high-energy transients without failure, ensuring the power supply's output remains stable. The TVS diode is typically placed at the AC input rectifier output or DC bus, clamping overvoltages before they reach the PWM controller and power semiconductors. The device's low leakage current (5μA) minimizes power loss in standby mode, improving overall efficiency. The SMC package's thermal performance allows the device to dissipate heat effectively during surge events. Designers should consider the TVS diode's clamping voltage (100V) relative to the downstream components' voltage ratings to ensure adequate protection. The device's wide operating temperature range (-55°C to +150°C) makes it suitable for industrial environments with extreme temperatures.
Recommended
Telecommunications Equipment
The SM15T56AY is used in telecommunications equipment to protect against lightning-induced surges on communication lines and power feeds. Its 1500W surge capability and fast response time ensure that sensitive transceivers and line drivers are protected from damaging transients. In a typical telecom power input, the TVS diode is placed across the -48V DC bus, clamping negative transients to safe levels. The device's unidirectional configuration is ideal for DC power rails, providing a low clamping voltage for positive transients. The 56V standoff voltage is suitable for 48V telecom systems, providing adequate margin above the nominal operating voltage. The device's AEC-Q101 qualification, while primarily for automotive, also indicates high reliability suitable for telecom infrastructure. Designers should ensure proper PCB layout with short traces to minimize inductance and optimize clamping performance.
Recommended
Consumer Electronics
In consumer electronics, the SM15T56AY protects power input stages from ESD and surge events, ensuring product reliability. Its compact SMC package is suitable for space-constrained designs, and its 1500W surge capability provides robust protection for devices like smart TVs, set-top boxes, and gaming consoles. The TVS diode is typically placed at the AC-DC adapter input or DC power jack, clamping overvoltages before they reach the main power management IC. The device's low leakage current (5μA) is beneficial for energy-efficient designs, reducing standby power consumption. The fast response time (<1ps) ensures that even fast ESD events are clamped effectively, protecting sensitive ICs from damage. Designers should consider the clamping voltage (100V) relative to the downstream components' voltage ratings to ensure adequate protection. The device's RoHS and REACH compliance makes it suitable for global markets.
Recommended
Renewable Energy Systems
The SM15T56AY is used in renewable energy systems, such as solar inverters and wind turbine controllers, to protect against surge events from lightning and grid disturbances. Its 1500W surge capability and high reliability make it suitable for outdoor installations where transients are common. In a solar inverter, the TVS diode is placed across the DC bus, clamping overvoltages before they reach the MPPT controller and power semiconductors. The device's wide operating temperature range (-55°C to +150°C) ensures reliable operation in harsh outdoor environments. The 56V standoff voltage is suitable for 48V battery systems, providing adequate margin above the nominal charging voltage. The device's low leakage current minimizes power loss, improving system efficiency. Designers should ensure proper thermal management, as the device may dissipate significant power during surge events. The AEC-Q101 qualification, while primarily for automotive, also indicates high reliability suitable for renewable energy applications.
Recommended
LED Lighting
In LED lighting systems, the SM15T56AY protects LED drivers from surge events on the AC mains or DC supply lines. Its 1500W surge capability ensures that LED drivers are protected from lightning-induced transients and switching surges, extending the lifespan of the lighting system. The TVS diode is typically placed at the input of the LED driver, clamping overvoltages before they reach the power factor correction (PFC) controller and LED driver IC. The device's compact SMC package is suitable for space-constrained LED bulb designs. The 56V standoff voltage is suitable for 48V LED lighting systems, providing adequate margin above the nominal operating voltage. The device's low leakage current minimizes power loss, improving energy efficiency. Designers should consider the clamping voltage (100V) relative to the LED driver's maximum input voltage rating to ensure adequate protection. The device's RoHS compliance makes it suitable for environmentally conscious designs.
Recommended
Recommended Products Summary
Engineering reference data for SM15T56AY — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | SM15T56A | SMCJ56A | 1.5SMC56A | SMDJ56A |
|---|---|---|---|---|---|
| Package | SMC (DO-214AB) | SMC (DO-214AB) - same | SMC (DO-214AB) - same | SMC (DO-214AB) - same | SMC (DO-214AB) - same |
| Brand | STMicroelectronics | STMicroelectronics | Littelfuse | Vishay | Bourns |
| Working Voltage (VRWM) | 56 V | 56 V | 56 V | 56 V | 56 V |
| Breakdown Voltage Range | 62.2V - 68.8V | 62.2V - 68.8V | 62.2V - 68.8V | 62.2V - 68.8V | 62.2V - 68.8V |
| Maximum Clamping Voltage | 100 V | 100 V | 100 V | 100 V | 100 V |
| Peak Pulse Power (10/1000μs) | 1500 W | 1500 W | 1500 W | 1500 W | 3000 W |
| AEC-Q101 Qualified | Yes | No | No | No | No |
| Leakage Current (max) | 5 μA | 5 μA | 5 μA | 5 μA | 5 μA |
Key Differentiators
- AEC-Q101 qualified for automotive use (vs SMCJ56A (Littelfuse))
- Same-brand availability with non-automotive variant (vs SM15T56A (STMicroelectronics))
- 1500W surge capability in a compact SMC package (vs SMDJ56A (Bourns))
Design Notes
Place the SM15T56AY as close as possible to the protected component or connector to minimize parasitic inductance. Use short, wide traces (at least 0.5mm wide) for the TVS diode connections, and ensure a solid ground plane underneath the device. This reduces voltage overshoot during fast transients and improves clamping performance. Refer to STMicroelectronics application note AN3155 for PCB layout guidelines.
During a surge event, the SM15T56AY dissipates up to 1500W for a 10/1000μs waveform. Although the average power is low, ensure the PCB has adequate copper area for heat dissipation to prevent thermal stress. The SMC package has a thermal resistance of approximately 15°C/W (junction-to-ambient) with proper copper area. For repeated surges, consider derating the device and providing additional thermal relief.
Do not exceed the working peak reverse voltage (56V) during normal operation, as this will cause the device to conduct and may lead to premature failure. Ensure the standoff voltage is higher than the maximum steady-state voltage of the protected line. Also, verify the polarity: for unidirectional TVS diodes, the cathode must be connected to the positive rail and the anode to ground. Incorrect polarity will result in no protection and potential damage.
Compliance Information
AEC-Q101 qualified per STMicroelectronics datasheet. RoHS and REACH compliant. Halogen-free status not explicitly stated in the provided data.
