SMBJ6.0CA - 600W 6V Bi-Dir TVS Diode | Littelfuse | Surge
MPN: SMBJ6.0CA ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.35 | $0.35 |
| 10 | $0.28 | $2.80 |
| 100 | $0.19 | $19.00 |
| 500 | $0.15 | $75.00 |
| 1,000 | $0.12 | $120.00 |
SMBJ6.0CA Overview
A TVS diode is a clamping overvoltage-protection device that responds to transient events in picoseconds, diverting surge current away from sensitive ICs. Within the power-electronics hierarchy, the TVS diode sits under surge protectors and voltage references in the broader family of circuit-protection components, complementing fuses and varistors in a layered protection scheme.
Key features of the SMBJ6.0CA include a 600 W peak pulse power rating (10/1000 us waveform per the SMBJ family datasheet), glass-passivated chip construction for low leakage current, and a bi-directional configuration (the C suffix) that clamps transients of both polarities - ideal for AC lines and bidirectional signal interfaces. The package supports surface-mount reflow assembly on standard land patterns.
The device protects against voltage transients induced by inductive load switching and lightning per the Littelfuse SMBJ series datasheet, and the ST SMBJ series variant is designed for ESD protection per IEC 61000-4-2 and MIL STD 883 Method 3015. Response time is at the nanosecond level, making it effective against fast-rising ESD and switching spikes that slower varistors cannot catch.
Typical applications include protection of I/O interfaces, VCC power buses, 5V and 3.3V logic rails, automotive inductive-load switching nodes, and industrial control equipment. Placing the SMBJ6.0CA directly across the rail to be protected clamps surges before downstream ICs see destructive voltage levels.
Design tip: choose a stand-off voltage at or above the maximum continuous operating voltage of the rail - at 6.0 V stand-off, the SMBJ6.0CA suits 5V logic rails with margin, while its leakage current remains low at normal operating voltage.
This page synthesizes distributor pricing, verified drop-in alternatives from Littelfuse, STMicroelectronics, Diodes Incorporated, Microchip and Yangjie, plus practical design notes not found in a single manufacturer datasheet.
Drop-in alternatives for SMBJ6.0CA — 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 SMBJ6.0CA (same form factor and footprint) — differing in Package, Response Time.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
SMBJ6.0CA-TR
✅ Drop-In📋 Reference alternative (not in catalog)
SMBJ6.0CA
✅ Drop-In✓ In Stock
$0.12 / Unit
View Datasheet →SMBJ6.0CA-e3
✅ Drop-In📋 Reference alternative (not in catalog)
SMBJ6.0CA
✅ Drop-In✓ In Stock
$0.12 / Unit
View Datasheet →SMBJ6.0CA
✅ Drop-In✓ In Stock
$0.12 / Unit
View Datasheet →SMBJ6.0CA
✅ Drop-In✓ In Stock
$0.12 / Unit
View Datasheet →SMBJ6.0CA
✅ Drop-In✓ In Stock
$0.12 / Unit
View Datasheet →SMBJ6.0CA Maximum Ratings & Electrical Characteristics
| Configuration | Bi-directional |
| Peak Pulse Power Dissipation | 600 W (10/1000 us) |
| Reverse Stand-off Voltage (VRWM) | 6.0 V |
| Breakdown Voltage (VBR) | 6.67 V (min, at 1 mA) |
| Maximum Clamping Voltage (VC) | 10.3 V |
| Peak Pulse Current (IPP) | 58.3 A (Littelfuse) |
| Series | SMBJ |
| Mounting Type | Surface Mount |
| Package | DO-214AA (SMBJ) |
| Polarity | Bi-directional (C suffix) |
| Technology | Glass passivated junction TVS |
| Application | I/O interfaces, VCC bus, inductive load switching, lightning transients |
| Stand-off Voltage Range (Series) | 5.0 V to 170 V |
| ESD Capability (ST variant) | IEC 61000-4-2 / MIL STD 883 Method 3015 |
| Response Time | Nanosecond level |
SMBJ6.0CA Pin Configuration
| Pin 1 | A (Anode / Terminal 1) — Terminal 1 - bi-directional device, polarity not critical |
| Pin 2 | C (Cathode / Terminal 2) — Terminal 2 - bi-directional device, polarity not critical |
Typical Applications
SMBJ6.0CA is suitable for 6 applications: I/O Interface Protection, 5V / 3.3V Power Rail Clamping, Automotive Inductive Load Switching, Industrial Control Equipment, Lightning-Induced Surge Protection, ESD Protection for Communication Ports.
I/O Interface Protection
The SMBJ6.0CA protects field-wired I/O interfaces where cables can couple ESD, electrical fast transients, and surge energy into the system. Its 6.0 V stand-off voltage suits 5V logic levels, and the bi-directional configuration clamps transients of either polarity - important when cable orientation is uncontrolled. According to STMicroelectronics, the SMBJ series meets IEC 61000-4-2 ESD and is tested per MIL STD 883 Method 3015, giving quantified robustness at the connector edge. Place the TVS within millimeters of the connector with a short, wide return trace; the 58.3 A peak pulse capability (Littelfuse) at a 10.3 V clamp keeps residual voltage below the absolute maximum of most interface ICs such as RS-485 transceivers and logic buffers.
Recommended
5V / 3.3V Power Rail Clamping
On 5V DC power buses, the SMBJ6.0CA provides secondary clamping after bulk surge elements. Its 6.0 V reverse stand-off exceeds the 5 V rail with margin, so leakage stays low during normal operation, while the 600 W (10/1000 us) rating absorbs inductive-load switching spikes that buck converters and upstream wiring inject. The bi-directional part also clips negative ringing from cable inductance at connector inputs. Cross-reference guides from YINT and Semiware note this is one of the most common use cases for the SMBJ6.0CA across 5V and 3.3V rail protection. For best results, pair it with adequate bulk capacitance and keep the TVS loop area small; the 10.3 V maximum clamp protects 5V-tolerant ICs while dissipating surge energy in the diode rather than downstream LDOs and regulators.
Recommended
Automotive Inductive Load Switching
Automotive modules switching relays, solenoids, motors, and lamps generate load-dump-like transients from stored inductive energy. The SMBJ6.0CA clamps these spikes locally at the switch node with nanosecond response, protecting low-side drivers and logic. Its bi-directional characteristic handles the negative spikes from inductive kickback in H-bridge topologies. Per the Littelfuse datasheet, the SMBJ family is designed specifically against voltage transients induced by inductive load switching and lightning. Designers should size for repetitive pulses: while the single-pulse rating is 600 W, repeated events raise junction temperature, so thermal relief via PCB copper under the DO-214AA pads is recommended. Qualified automotive-adjacent drivers benefit when the TVS sits directly across the load or the supply pin of the driver IC.
Recommended
Industrial Control Equipment
PLCs, sensor transmitters, and factory-floor control equipment face a hostile electrical environment with switching transients from contactors, VFDs, and long cable runs. Semiware's application notes position the SMBJ6.0CA as a standard choice for power supply, communication, and industrial control applications due to its 600 W surge absorption, nanosecond-level response, and low leakage. On 24V industrial systems, the SMBJ6.0CA serves best on derived 5V/3.3V internal rails or communication transceiver lines rather than the raw 24V bus (which needs higher stand-off parts like SMBJ24CA). The glass-passivated junction construction offers high reliability and low cost per the series description, making it economical to place multiple devices at every vulnerable node.
Recommended
Lightning-Induced Surge Protection
Outdoor-connected equipment such as gate controllers, antenna feeds, and telecom line cards must survive lightning-induced surges arriving via cables. The Littelfuse SMBJ series is explicitly characterized for protection against voltage transients induced by lightning, with the 600 W / 10/1000 us rating defining its energy capability. In a coordinated protection scheme, a gas discharge tube or MOV absorbs the bulk of the surge energy at the entry point, while the SMBJ6.0CA clamps the residual fast edge to 10.3 V before sensitive ICs, since its nanosecond response outpaces slower coarse protectors. Bi-directional clamping matters for symmetric or AC-coupled lines. Surge current sharing resistors between stages ensure the fast TVS does not take the full lightning energy alone.
Recommended
ESD Protection for Communication Ports
STMicroelectronics states the SMBJ series is designed to protect sensitive equipment against ESD per IEC 61000-4-2 and MIL STD 883 Method 3015, making the SMBJ6.0CA effective at communication ports such as RS-485, CAN physical layers, and 5V serial interfaces. The bi-directional clamp handles the positive and negative ESD pulses of the standard's test levels. Because the device body is a relatively large DO-214AA compared to dedicated ESD arrays, it suits power-plus-signal entry nodes rather than high-speed differential pairs, where larger capacitance would distort signaling. Place the TVS at the connector with a solid low-inductance ground connection; clamping voltage measured at the IC also includes L*di/dt across the traces, so every millimeter of trace adds hundreds of volts during an 8 kV contact discharge event.
Recommended
Recommended Products Summary
Engineering reference data for SMBJ6.0CA — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | SMBJ6.0CA-TR (ST) | SMBJ6.0CA (Diodes Inc.) | SMBJ6.0CA-e3 (Microchip) | SMBJ6.0CA (YANGJIE) | SMBJ6.0CA (EIC) |
|---|---|---|---|---|---|---|
| Package | DO-214AA (SMBJ) | DO-214AA (SMB) - same | DO-214AA (SMBJ) - same | DO-214AA (SMBJ) - same | DO-214AA (SMBJ) - same | DO-214AA (SMBJ) - same |
| Brand | Littelfuse | STMicroelectronics | Diodes Incorporated | Microchip Technology | YANGJIE | EIC |
| Peak Pulse Power | 600 W | 600 W | 600 W | 600 W | 600 W | 600 W |
| Stand-off Voltage | 6.0 V | 6.0 V | 6.0 V | 6.0 V | 6.0 V | 6.0 V |
| Configuration | Bi-directional | Bi-directional | Bi-directional | Bi-directional | Bi-directional | Bi-directional |
Key Differentiators
- Nanosecond response for fast transients (vs MOV/varistor solutions)
- Bi-directional clamping in one package (vs SMBJ6.0A (uni-directional))
- Broad multi-vendor availability (vs SMBJ6.0CA (YANGJIE/EIC))
Design Notes
TVS effectiveness depends as much on layout as on the device. Place the SMBJ6.0CA within a few millimeters of the connector or the pin being protected, with a direct, short, wide trace to the ground plane. During an ESD strike at 8 kV contact, trace inductance of even 10 nH adds roughly V = L*di/dt overshoot at the protected IC. The DO-214AA package has two end pads; use both with full copper under the body for surge current spreading.
The 600 W rating applies to a single 10/1000 us pulse. For repetitive surge environments (e.g., a relay cycling thousands of times), derate by duty cycle: estimated average power is Ppeak * duty; for 600 W pulses every 100 ms with 1 ms duration, average dissipation is about 6 W-equivalent only during events - verify junction temperature stays within limits using the manufacturer thermal resistance and your PCB copper area. Consult the SMBJ family datasheet pulse derating curves for multi-pulse applications.
Selecting the wrong stand-off voltage is the most common TVS mistake. The SMBJ6.0CA has a 6.0 V stand-off - do not place it directly on a 12 V or 24 V bus, where it would conduct continuously and fail. For 12 V rails use SMBJ12CA-class parts; for 24 V use SMBJ24CA. Conversely, on a 5V rail the 6.0 V stand-off gives correct margin without excessive leakage. Confirm maximum continuous rail voltage including tolerances before choosing the TVS.
Compliance Information
Littelfuse publishes Environmental Information on the SMBJ6.0CA product page; consult the manufacturer compliance sheet per MPN before certification. No compliance claims asserted without per-part documentation.
