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 |
SMBJ5.0A Overview
A TVS diode is a silicon avalanche protection device placed across sensitive circuit nodes to clamp fast high-energy transients such as ESD, EFT, inductive load switching spikes, and lightning-induced surges. Within the power-protection hierarchy, TVS diodes sit above small ESD arrays in surge capability and are a core element of any input-protection subsystem in a power management design.
Key features of the SMBJ5.0A include the industry-standard 600 W peak pulse power rating (10/1000 us waveform), very fast response to transient events, low clamping voltage for a 5 V rail, and glass-passivated junction construction for reliability. The unidirectional polarity makes it ideal for low-voltage DC lines where the transient has a defined polarity.
Technically, the device exploits the silicon avalanche breakdown effect: below the breakdown voltage it is essentially non-conducting with low leakage, and during a surge it avalanches in nanoseconds, diverting the surge current to ground while holding the node near the 9.2 V maximum clamp. This protects downstream ICs, MOSFETs, and signal interfaces that exceed a 5 V absolute maximum rating.
Typical applications include 5 V DC power-input protection in consumer electronics, transient suppression on 24 V industrial control signal lines with series current limiting, automotive low-voltage rail protection, and surge immunity design per IEC 61000-4-2 and IEC 61000-4-4 test environments as cited by STMicroelectronics for the same SMBJ series.
Design consideration: the SMBJ5.0A clamps at up to 9.2 V, so the protected device must tolerate this level, or a lower-clamp ESD array should be added downstream. Keep the TVS trace short to minimize parasitic inductance, which otherwise raises the effective clamp voltage during fast edges.
This page adds value beyond the datasheet: distributor pricing tiers, five multi-source drop-in alternatives, an 8-parameter comparison table, and practical surge-protection design notes synthesized in one place.
Drop-in alternatives for SMBJ5.0A — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with SMBJ5.0A (same form factor and footprint) — differing in Package, RoHS Status, Peak Pulse Current (IPP), Peak Pulse Current (Ipp), Series.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
SMBJ5.0A
✅ Drop-In✓ In Stock
$0.024 / Unit
View Datasheet →SMBJ5.0A
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$0.024 / Unit
View Datasheet →SMBJ5.0A
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$0.024 / Unit
View Datasheet →SMBJ5.0A-TR
✅ Drop-In📋 Reference alternative (not in catalog)
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 |
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.
