SMBJ6.0A - 600W 6V Uni TVS Diode SMB | Littelfuse
MPN: SMBJ6.0A ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.32 | $0.32 |
| 10 | $0.27 | $2.70 |
| 100 | $0.18 | $18.00 |
| 500 | $0.14 | $70.00 |
| 1,000 | $0.11 | $110.00 |
SMBJ6.0A Overview
A TVS diode is a silicon avalanche overvoltage protector placed in parallel with the rail or line being protected. Within the protection hierarchy, it sits alongside ESD arrays and gas discharge tubes as a circuit-protection component: it clamps fast transient events in nanoseconds, absorbing surge energy that would otherwise destroy downstream ICs, MOSFETs, and signal-line interfaces. The SMBJ family is the 600 W surface-mount tier between the smaller SMAJ (400 W) and larger SMCJ (1500 W) families.
Key features of the SMBJ6.0A include 600 W peak pulse power capability at the 10/1000 us double-exponential waveform, low in-line capacitance and an avalanche-mode response time typically below 1.0 picosecond, a tight 5% tolerance on standoff voltage, and a low-profile DO-214AA package compatible with automated pick-and-place assembly and 260 C reflow profiles.
Technically, the device uses a large-junction silicon die biased below its avalanche breakdown of 6.67 V minimum during normal operation, conducting only leakage current. During a transient, the junction avalanches within nanoseconds and dissipates the surge energy as heat, holding the rail below the 10.3 V maximum clamp. Per manufacturer datasheets, the SMBJ series is qualified against IEC 61000-4-2 ESD and MIL STD 883 method 3015, plus IEC 61000-4-4 and IEC 61000-4-5 burst and surge events.
Typical applications include 5 V and 3.3 V power-rail protection in industrial supplies, automotive module secondary protection, and transient clamping on signal lines and inductive-load-switching circuits where lightning-induced or switching transients threaten ICs and MOSFETs.
Design consideration: place the TVS close to the connector or transient entry point with a short, wide low-inductance return path to ground; also verify that the worst-case clamp voltage (10.3 V) remains below the absolute maximum rating of the protected device.
This page synthesizes distributor pricing, drop-in alternatives from multiple manufacturers, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for SMBJ6.0A — 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 SMBJ6.0A (same form factor and footprint) — differing in Package, Maximum Clamping Voltage (VC), Breakdown Voltage (VBR), Peak Pulse Current (IPP), Polarity.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
SMBJ6.0CA
✅ Drop-In✓ In Stock
$0.12 / Unit
View Datasheet →SMBJ5.0A
✅ Drop-In✓ In Stock
$0.024 / Unit
View Datasheet →SMBJ6.0A
✅ Drop-In✓ In Stock
$0.11 / Unit
View Datasheet →SMBJ6.0A
✅ Drop-In✓ In Stock
$0.11 / Unit
View Datasheet →SMBJ6.0A
✅ Drop-In✓ In Stock
$0.11 / Unit
View Datasheet →SMBJ6.0A
✅ Drop-In✓ In Stock
$0.11 / Unit
View Datasheet →SMBJ6.0A
✅ Drop-In✓ In Stock
$0.11 / Unit
View Datasheet →SMBJ6.0A Maximum Ratings & Electrical Characteristics
| Product Type | TVS Diode, Unidirectional |
| Peak Pulse Power (10/1000 us) | 600 W |
| Working Peak Reverse Voltage (VRWM) | 6.0 V |
| Standoff Voltage Tolerance | 5 % |
| Breakdown Voltage (VBR) Min | 6.67 V |
| Maximum Clamping Voltage (VC) | 10.3 V |
| Peak Pulse Current (Ipp) | 58.3 A |
| Directionality | Unidirectional |
| Response Time | < 1.0 ps (typical, unidirectional) |
| Package | DO-214AA (SMB) |
| Mounting Type | Surface Mount |
| Reflow Soldering Rating | 260 C / 40 s |
| ESD Qualification | IEC 61000-4-2, MIL STD 883 Method 3015 |
| Surge Qualification | IEC 61000-4-4, IEC 61000-4-5 |
| RoHS Status | Compliant (Pb-free series) |
SMBJ6.0A Pin Configuration
| Pin 1 | Cathode — Cathode terminal (marked with band); connects to positive rail in unidirectional protection |
| Pin 2 | Anode — Anode terminal; connects to ground in unidirectional protection |
Typical Applications
SMBJ6.0A is suitable for 6 applications: 5V and 3.3V Power Rail Protection, Industrial Power Supplies, Automotive Secondary Rail Protection, Signal Line and Interface Protection, Inductive Load Switching Circuits, Consumer and IoT Device Input Protection.
5V and 3.3V Power Rail Protection
The SMBJ6.0A's 6.0 V standoff voltage and 6.67 V minimum breakdown make it the standard 600 W TVS choice for protecting 5 V and 3.3 V regulated rails. Placed directly after the regulator output or at the board power-entry connector, it idles at microamp-level leakage below 6 V and avalanches within nanoseconds during a surge, holding the rail below the 10.3 V maximum clamp at up to 58.3 A. Unlike a dedicated ESD array, it absorbs sustained 10/1000 us surge energy of 600 W, but its higher junction capacitance limits it to DC and low-speed rails rather than high-frequency data lines.
Recommended
Industrial Power Supplies
Industrial environments expose power inputs to surges induced by inductive load switching, contactors, and lightning per IEC 61000-4-5. The SMBJ6.0A protects post-regulator 5 V electronics in PLC I/O modules, sensor transmitters, and motor-control boards, where its 600 W surge absorption and IEC 61000-4-4/-5 qualified robustness prevent destructive overshoot. In a typical stage-two protection scheme, it sits behind a series impedance or upstream higher-voltage TVS, clamping residual transients below the 10.3 V worst-case figure so downstream microcontrollers and MOSFET gates never exceed their absolute maximum ratings during surge events.
Recommended
Automotive Secondary Rail Protection
In automotive electronics, the SMBJ6.0A serves as secondary protection on 5 V sensor-supply and logic rails behind a front-end load-dump clamp such as an SMBJ24A-class device. Its 6.0 V standoff tolerates regulated-rail excursions while the 58.3 A surge capability absorbs residual transients from ISO pulse-style events, and the AEC-grade ecosystem of the SMBJ family supports qualification flows. Placement at the connector side of modules like body controllers and gateways, with a short ground return, keeps clamp voltage low enough to protect 5 V microcontrollers, LIN transceivers, and MOSFET gate drivers.
Recommended
Signal Line and Interface Protection
For RS-485, CAN, and general I/O lines carrying slow or power-domain signals, the SMBJ6.0A provides qualified protection against ESD per IEC 61000-4-2 and MIL STD 883 method 3015 and against burst per IEC 61000-4-4. Its sub-picosecond avalanche response means clamping begins before the transient propagates to the protected IC. Engineers should note the device's capacitance: it suits power-oriented or low-speed signal lines, while multi-hundred-megabit interfaces need a low-capacitance ESD array instead. On unidirectional positive-signal lines the SMBJ6.0A's -0.7 V forward clamp is an additional benefit against negative ring-back.
Recommended
Inductive Load Switching Circuits
When relays, solenoids, and DC motors switch off, stored inductive energy produces fast high-voltage spikes on adjacent rails and nodes. The SMBJ6.0A clamps these switching transients on low-voltage control electronics, absorbing surge energy with 600 W capability and sub-nanosecond response, which protects MOSFET gate drivers and microcontroller inputs from electrical overstress. Because the device recovers to a low-leakage blocking state automatically, it needs no control circuitry - a key advantage over crowbar-type protection. Proper low-inductance layout at the transient source is essential for the clamp to be effective at high di/dt.
Recommended
Consumer and IoT Device Input Protection
Consumer electronics and IoT nodes with USB or adapter-powered 5 V inputs benefit from the SMBJ6.0A's low-cost, compact DO-214AA protection at the power entry. It handles adapter hot-plug transients, cable-inductance ring-back, and surge events defined in IEC 61000-4-5, holding the input below 10.3 V so the downstream 5 V buck or LDO stays within ratings. The SMB package suits space-constrained designs and automated assembly, and the JEDEC-standard part number guarantees multi-source supply - important for consumer products with long production lifetimes and shifting distributor stock.
Recommended
Recommended Products Summary
Engineering reference data for SMBJ6.0A — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | SMBJ6.0CA | SMBJ5.0A | SMBJ6.0A (ST) | SMBJ6.0A (Bourns) |
|---|---|---|---|---|---|
| Package | DO-214AA (SMB) | DO-214AA (SMB) - same | DO-214AA (SMB) - same | DO-214AA (SMB) - same | DO-214AA (SMB) - same |
| Brand | Littelfuse | Littelfuse | Littelfuse | STMicroelectronics | Bourns |
| Working Peak Reverse Voltage | 6.0 V | 6.0 V | 5.0 V | 6.0 V | 6.0 V |
| Peak Pulse Power | 600 W | 600 W | 600 W | 600 W | 600 W |
| Directionality | Unidirectional | Bidirectional | Unidirectional | Unidirectional | Unidirectional |
| Standoff Voltage Tolerance | 5 % | 5 % | 5 % | 5 % | 5 % |
Key Differentiators
- 6.0 V standoff suits 5 V logic rails (vs SMBJ5.0A)
- Unidirectional low negative clamp (vs SMBJ6.0CA)
- JEDEC-standard multi-source part number (vs SMBJ6.0A (ST/SMC/Bourns/Vishay/onsemi))
Design Notes
Place the SMBJ6.0A as close as possible to the transient entry point (connector or regulator output) with a short, wide trace to the ground plane. Loop inductance in series with a TVS adds L*di/dt overshoot on top of the 10.3 V clamp - at 58.3 A even 10 nH adds roughly 5.8 V for a 1 us edge. Use multiple ground vias adjacent to the anode pad and keep the protected trace downstream of the TVS so the clamp sees the transient first.
Verify clamp headroom: the worst-case 10.3 V clamp at 58.3 A must sit below the absolute maximum rating of every protected device, not just its nominal operating voltage. A 5 V IC with a 6 V abs-max cannot use the SMBJ6.0A; choose the SMBJ5.0A class instead. Also confirm the surge energy: 600 W applies to the 10/1000 us waveform - longer or more repetitive events require derating per the manufacturer power-vs-pulse-duration curves, or a larger SMCJ-family part.
Estimated: continuous dissipation is negligible in normal operation (leakage current is microamp-level below 6 V standoff), so no thermal design is needed for steady state. All thermal design effort should target the transient event - the SMB package die absorbs a single 600 W / 10/1000 us pulse within its thermal mass, but repetitive pulses at high duty cycle accumulate heat; consult the family datasheet derating curves above 25 C ambient and reduce peak power accordingly.
Compliance Information
RoHS Pb-free per Littelfuse SMBJ series datasheet and Mouser listing (600W 6V 5% Uni-Directional, Pb-free series). REACH and halogen-free status not stated in provided data.
