SMA4F5.0AY - 5.0V TVS Diode, SMA Flat Package | STMicroelectronics
MPN: SMA4F5.0AY ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.12 | $0.12 |
| 10 | $0.1 | $1.00 |
| 100 | $0.08 | $8.00 |
| 500 | $0.07 | $35.00 |
| 1,000 | $0.06 | $60.00 |
Drop-in alternatives for SMA4F5.0AY — 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:
SMAJ5.0A
✅ Drop-In📋 Reference alternative (not in catalog)
SMAJ5.0A
✅ Drop-In📋 Reference alternative (not in catalog)
P4SMAJ5.0A
✅ Drop-In📋 Reference alternative (not in catalog)
SMA4F5.0AY Maximum Ratings & Electrical Characteristics
| Type | TVS Diode (Unidirectional) |
| Standoff Voltage (VRWM) | 5.0 V |
| Breakdown Voltage (VBR) | 6.4 V to 7.0 V |
| Clamping Voltage (VC at IPP) | 9.2 V (typical) |
| Peak Pulse Power (PPP) | 400 W (10/1000µs) |
| Peak Pulse Current (IPP) | 43.5 A (10/1000µs) |
| Leakage Current (IR) | 1 µA (max at VRWM) |
| Capacitance (C) | 1200 pF (typical at 0V, 1MHz) |
| Response Time | < 1 ns |
| Operating Temperature Range | -55°C to +150°C |
| Package | SMAflat (SMA) |
| Mounting Type | Surface Mount |
| Height | 1.0 mm (max) |
| RoHS Status | Compliant |
| Halogen Free | Yes |
SMA4F5.0AY Pin Configuration
| Pin 1 | Cathode — Connected to the positive rail or signal line |
| 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
SMA4F5.0AY is suitable for 6 applications: Power Supply Protection, ESD Protection for I/O Ports, Automotive Electronics, Industrial Control Systems, Telecommunications Equipment, Consumer Electronics.
Power Supply Protection
The SMA4F5.0AY is used to protect power supply inputs from voltage transients. Its 5.0V standoff voltage makes it ideal for 5V rails, clamping overvoltages to safe levels. In a typical application, the TVS diode is placed across the input capacitor, with the cathode connected to the positive rail and anode to ground. This ensures that any transient above the breakdown voltage is shunted to ground, protecting downstream components. The device's 400W peak pulse power can handle moderate surges, and its fast response time (<1ns) ensures minimal voltage overshoot. For higher surge currents, a larger TVS or additional protection may be needed.
Recommended
ESD Protection for I/O Ports
The SMA4F5.0AY provides ESD protection for I/O ports in consumer electronics. Its low clamping voltage (9.2V) and fast response time (<1ns) ensure that ESD events are clamped before they can damage sensitive ICs. In a typical application, the TVS diode is placed near the connector, with the cathode connected to the signal line and anode to ground. This configuration is suitable for unidirectional signals. The device's capacitance (1200pF) may affect high-speed signals, so it is best suited for low-speed interfaces like UART, I2C, or GPIO. For high-speed lines, a lower-capacitance TVS is recommended.
Recommended
Automotive Electronics
In automotive applications, the SMA4F5.0AY protects electronic control units (ECUs) from load dump and other transients. Its wide operating temperature range (-55°C to +150°C) and 400W peak pulse power make it suitable for harsh automotive environments. The device is often placed on the power input of ECUs, clamping transients from the vehicle's 12V battery system. For 5V logic rails, the SMA4F5.0AY provides effective protection. However, for load dump transients, a higher-power TVS may be required. The SMAflat package's low profile is advantageous in space-constrained automotive modules.
Recommended
Industrial Control Systems
The SMA4F5.0AY is used in industrial control systems to protect PLCs, sensors, and actuators from voltage transients caused by inductive loads and switching. Its robust construction and wide temperature range ensure reliable operation in factory environments. In a typical application, the TVS diode is placed across the power supply terminals of a sensor or actuator, clamping any induced transients. The device's 400W peak pulse power can handle common industrial surges, but for severe environments, additional protection like MOVs may be needed. The SMAflat package allows for compact PCB designs in control panels.
Recommended
Telecommunications Equipment
In telecommunications, the SMA4F5.0AY protects line cards and communication interfaces from lightning-induced surges. Its fast response time and low clamping voltage are critical for maintaining signal integrity. The device is often placed on the line side of the interface, clamping transients before they reach the transceiver. For 5V logic interfaces, the SMA4F5.0AY provides adequate protection. However, for high-speed data lines, the device's capacitance may be too high, and a low-capacitance TVS should be considered. The SMAflat package is suitable for high-density telecom boards.
Recommended
Consumer Electronics
The SMA4F5.0AY is widely used in consumer electronics such as set-top boxes, gaming consoles, and smart home devices to protect power and signal lines from ESD and surges. Its low cost and small footprint make it ideal for high-volume production. In a typical application, the TVS diode is placed on the power input and I/O connectors. The device's 400W peak pulse power is sufficient for most consumer-level transients. The SMAflat package's low profile is beneficial for slim device designs. For USB ports, a low-capacitance TVS is recommended to avoid signal degradation.
Recommended
Recommended Products Summary
Engineering reference data for SMA4F5.0AY — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | SMAJ5.0A (ST) | SMAJ5.0A (Littelfuse) | P4SMAJ5.0A | SMBJ5.0A |
|---|---|---|---|---|---|
| Package | SMAflat (SMA) | SMA (DO-214AC) | SMA (DO-214AC) | SMA (DO-214AC) | SMB (DO-214AA) |
| Brand | STMicroelectronics | STMicroelectronics | Littelfuse | Vishay | Littelfuse |
| Standoff Voltage | 5.0 V | 5.0 V | 5.0 V | 5.0 V | 5.0 V |
| Breakdown Voltage | 6.4-7.0 V | 6.4-7.0 V | 6.4-7.0 V | 6.4-7.0 V | 6.4-7.0 V |
| Clamping Voltage | 9.2 V | 9.2 V | 9.2 V | 9.2 V | 9.2 V |
| Peak Pulse Power | 400 W | 400 W | 400 W | 400 W | 600 W |
| Package Height | 1.0 mm | 2.0 mm | 2.0 mm | 2.0 mm | 2.3 mm |
| Capacitance | 1200 pF | 1200 pF | 1200 pF | 1200 pF | 1200 pF |
Key Differentiators
- Low-profile SMAflat package (vs SMAJ5.0A (ST))
- Same electrical performance as SMAJ5.0A (vs SMAJ5.0A (Littelfuse))
- Automotive-grade temperature range (vs P4SMAJ5.0A)
Design Notes
Place the SMA4F5.0AY as close as possible to the protected connector or IC to minimize parasitic inductance. Use a low-impedance ground connection, preferably with a dedicated ground plane, to ensure effective clamping. The trace from the TVS diode to the protected line should be short and wide to reduce voltage drop during transient events.
Although the SMA4F5.0AY can handle 400W peak pulse power, continuous power dissipation is limited. Ensure that the average power dissipation does not exceed the device's rating. For repetitive transients, consider the thermal impedance of the PCB and provide adequate copper area for heat sinking. The SMAflat package has a low thermal resistance, but proper layout is still essential.
Do not exceed the standoff voltage (5.0V) during normal operation, as this will cause the TVS diode to conduct and may lead to failure. Also, be aware of the device's capacitance (1200pF), which can degrade high-speed signals. For high-frequency applications, consider using a low-capacitance TVS diode. Always verify the polarity: the cathode must be connected to the positive rail, and the anode to ground for unidirectional protection.
Compliance Information
RoHS compliant and halogen-free per STMicroelectronics product page. Not AEC-Q100 qualified, but suitable for automotive applications based on temperature range.
