SMBJ5.0A - 600W 5V TVS Diode, DO-214AA | Littelfuse
MPN: SMBJ5.0A ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.05 | $0.05 |
| 10 | $0.04 | $0.40 |
| 100 | $0.032 | $3.20 |
| 500 | $0.027 | $13.50 |
| 1,000 | $0.024 | $24.00 |
Drop-in alternatives for SMBJ5.0A — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
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SMBJ5.0A
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$0.024 / Unit
View Datasheet →SMBJ5.0A
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View Datasheet →SMBJ5.0A
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$0.024 / Unit
View Datasheet →SMBJ5.0A-TR
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SMBJ5.0A
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$0.024 / Unit
View Datasheet →SMBJ5.0A Maximum Ratings & Electrical Characteristics
| Product Type | TVS Diode (Transient Voltage Suppressor), Unidirectional |
| Peak Pulse Power Dissipation | 600 W (10/1000 us) |
| Reverse Stand-off Voltage (VRWM) | 5 V |
| Breakdown Voltage (VBR) | 6.4 V to 7.0 V at 1 mA |
| Maximum Clamping Voltage (VC) | 9.2 V |
| Peak Pulse Current (IPP) | 65.3 A (Littelfuse, at VC max) |
| Polarity | Unidirectional |
| Package | DO-214AA (SMB), Surface Mount |
| Mounting Type | Surface Mount |
| Termination Style | 2-terminal, J-bend SMD |
| Series | SMBJ |
| RoHS Status | Compliant |
SMBJ5.0A Pin Configuration
| Pin 1 | Cathode — Cathode terminal; connect to the positive (protected) node in unidirectional use; marked by the band/cathode mark on the package |
| Pin 2 | Anode — Anode terminal; connect to ground in unidirectional 5 V rail protection |
Peak Pulse Power Derating (10/1000 us)
Typical Applications
SMBJ5.0A is suitable for 6 applications: 5V Power Rail Input Protection, Industrial Signal Line Surge Protection, Automotive Low-Voltage Rail Protection, Consumer Electronics Port Protection, Networking and Telecom Equipment, Security and Surveillance Camera Systems.
5V Power Rail Input Protection
The SMBJ5.0A is purpose-built for 5 V DC power inputs: its 5 V reverse stand-off voltage keeps the diode non-conducting during normal operation with only microamp-level leakage, while the 600 W surge rating absorbs transients from adapter hot-plug events, inductive cable effects, and coupled switching spikes. Placed directly at the power entry connector with short, wide traces, the diode avalanches in nanoseconds and clamps the rail at a maximum of 9.2 V at the full 65.3 A peak pulse current. Downstream DC-DC converters and LDOs rated for 10 V input or higher tolerate this clamp level without additional components, making a single SMBJ5.0A a complete primary input-protection stage for USB, wall-adapter, and rail-fed 5 V systems.
Recommended
Industrial Signal Line Surge Protection
Industrial 4-20 mA loops, PLC digital inputs, and sensor signal lines experience EFT bursts and surge events per IEC 61000-4-4 and IEC 61000-4-5. The SMBJ5.0A provides the 600 W energy absorption needed on low-voltage signal interfaces; when combined with a series current-limiting resistor (typically 10 to 100 ohm), the diode clamps induced transients before they reach comparator or ADC inputs. The DO-214AA surface-mount package supports automated SMT assembly on dense industrial I/O boards, and the unidirectional polarity suits single-ended signal references. Because STMicroelectronics explicitly qualifies the same SMBJ series against IEC 61000-4-2, -4-4, and -4-5 test levels, designers can cite this device family directly in EMC immunity documentation for factory-automation equipment.
Recommended
Automotive Low-Voltage Rail Protection
In automotive electronics, 5 V sensor supplies and infotainment logic rails are exposed to load-switching transients and ESD from connector mating. The SMBJ5.0A, with 5 V stand-off and 9.2 V maximum clamp, protects these secondary rails behind a primary front-end TVS such as an SMBJ33A or SMBJ58A. The 600 W rating handles ISO 7637-style pulse energy remnants that pass the primary clamp, and the SMB package's robust termination construction withstands vibration and thermal cycling in under-dash environments. Designers should select the AEC-Q101 qualified supplier variant where the module requires automotive qualification, and verify clamp derating at the 85 C to 105 C in-cabin ambient conditions typical of passenger vehicles.
Recommended
Consumer Electronics Port Protection
USB ports, barrel-jack inputs, and external antenna connections in consumer devices face ESD and cable-discharge events. The SMBJ5.0A placed at the connector side absorbs bulk surge energy with its 600 W rating, while its nanosecond avalanche response catches the fast initial edge of an ESD strike. For USB 5 V lines, the 5 V stand-off voltage ensures zero impact on normal bus power delivery, and leakage stays in the microamp range so no sleep-mode current budget is violated. In multi-port designs, one SMBJ5.0A per port with short ground-return traces keeps loop inductance low; combined with a downstream low-capacitance ESD array, this two-stage topology achieves both high energy absorption and low residual clamping voltage at the protected IC.
Recommended
Networking and Telecom Equipment
Ethernet magnetics secondary sides, PoE low-voltage taps, and subscriber-line interfaces need surge suppression against induced lightning transients per IEC 61000-4-5. The SMBJ5.0A's 600 W capability (10/1000 us, the waveform used in telecom surge specifications) makes it well matched to protect 5 V logic rails in routers, switches, and set-top boxes. The device's low dynamic resistance during avalanche keeps the residual voltage near the 9.2 V clamp even at high surge current, protecting PHY chips and controllers. Placement immediately after common-mode chokes or isolation transformers, with a solid ground plane connection, minimizes the parasitic inductance that would otherwise add L*di/dt overshoot on top of the clamp voltage during a fast 1.2/50 us surge edge.
Recommended
Security and Surveillance Camera Systems
Outdoor IP cameras and doorbell systems suffer lightning-induced surges on long power and Ethernet cable runs, making surge protection mandatory at the camera input. The SMBJ5.0A protects the 5 V camera logic rail: with 5 V stand-off it idles invisibly during normal operation, and during an induced surge its 600 W rating plus 65.3 A peak current capability absorbs the energy that passes the primary gas-discharge or high-voltage TVS stage. The DO-214AA package's large termination area supports reliable solder joints under wide outdoor temperature swings (-40 C to +85 C typical), and the RoHS-compliant construction meets global consumer-security market requirements. Combining this TVS with an ESD array at the image-sensor and interface ICs creates a complete layered protection scheme.
Recommended
Recommended Products Summary
Engineering reference data for SMBJ5.0A — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | SMBJ5.0A (Bourns) | SMBJ5.0A (Vishay) | SMBJ5.0A (ST) | SMBJ5.0A-TR (Diodes Inc) | SMBJ5.0A (Semiware) |
|---|---|---|---|---|---|---|
| Package | DO-214AA (SMB) | DO-214AA (SMB) - same | DO-214AA (SMB) - same | DO-214AA (SMB) - same | DO-214AA (SMB) - same | DO-214AA (SMB) - same |
| Brand | Littelfuse | Bourns | Vishay | STMicroelectronics | Diodes Incorporated | Semiware |
| Peak Pulse Power | 600 W (10/1000 us) | 600 W | 600 W | 600 W | 600 W | 600 W |
| Stand-off Voltage | 5 V | 5 V | 5 V | 5 V | 5 V | 5 V |
| Max Clamping Voltage | 9.2 V | 9.2 V | 9.2 V | 9.2 V | 9.2 V | 9.2 V |
| Peak Pulse Current (IPP) | 65.3 A | 65.2 A | 65.3 A | 65.3 A | 65.3 A | 65.3 A |
| Breakdown Voltage (VBR) | 6.4 V to 7.0 V | 6.4 V to 7.0 V | 6.4 V to 7.0 V | 6.4 V to 7.0 V | 6.4 V to 7.0 V | 6.4 V to 7.0 V |
| Unit Price (qty 1) | $0.05 | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
Key Differentiators
- Highest IPP among verified suppliers (vs SMBJ5.0A (Bourns))
- 50% more surge capacity than SMAJ alternatives (vs SMAJ5.0A)
- Multi-source availability de-risks supply chain (vs SMBJ5.0A (Vishay / ST / Diodes Inc))
Design Notes
Minimize the loop inductance between the TVS, the protected node, and ground. During a fast surge edge the current can slew at tens of amperes per microsecond, and every nanohenry of trace inductance adds L*di/dt overshoot on top of the 9.2 V clamp. Place the SMBJ5.0A within a few millimeters of the connector or entry point, use wide (at least 2 mm) traces, and connect the anode pad directly to a solid ground plane with multiple vias rather than a thin ground trace.
Estimated: the 600 W rating applies to a single 10/1000 us pulse. For a 9.2 V clamp, a 65.3 A surge deposits about 600 W for 1 ms. If surges repeat faster than roughly one per second, average power rises and junction heating accumulates - apply the datasheet derating curve above 25 C ambient and consider stepping up to the 1500 W SMBJ or SMCJ family for high-exposure environments. Series impedance (a 10 to 100 ohm resistor or a ferrite) upstream of the TVS shifts energy into the resistor and greatly improves TVS survival.
Do not exceed the 5 V stand-off voltage in continuous operation - operating between 5 V and the 6.4 V breakdown causes elevated leakage and self-heating. Note the polarity: the cathode band must face the positive rail; reversing a unidirectional TVS will clamp the 5 V supply at the ~0.7 V forward diode drop and short the rail. Finally, verify that protected ICs tolerate the full 9.2 V clamp; 5 V-absolute-maximum devices need a second-stage low-clamp ESD array.
Compliance Information
RoHS compliant per PartGenie compliance summary. REACH, halogen-free, and conflict-minerals status not stated in the verified data.
