USB6B1RL - 5.25V 8-SOIC USB ESD Protection | STMicroelectronics
MPN: USB6B1RL ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.2441 | $0.24 |
| 10 | $0.2441 | $2.44 |
| 100 | $0.2441 | $24.41 |
| 500 | $0.2441 | $122.05 |
| 1,000 | $0.2441 | $244.10 |
USB6B1RL Overview
A TVS diode array is an electrostatic-discharge and transient-voltage protection device. It normally remains electrically transparent to low-voltage signals, then conducts or clamps during an ESD event to divert surge energy away from the protected connector and controller. In the wider protection hierarchy, USB6B1RL belongs to circuit-protection semiconductors, ESD-protection devices, TVS diode arrays, and USB interface protection.
Key verified characteristics include a 5.25 V maximum working voltage, a 500 W rated clamping pulse, two protected data inputs, very low capacitance, and an 8-pin SOIC package. These features make the part suitable for USB data-line protection close to an external connector. The low-capacitance construction is especially relevant when preserving high-speed signal edges, while the integrated bridge provides a defined diversion path during electrostatic discharge.
The USB6B1 family is described by STMicroelectronics as protection for two input lines against overvoltage. Its full diode-bridge arrangement also keeps the power rails within a safe limiting condition. The available verified results identify USB6B1RL specifically as a data-line ESD-protection device in an 8-SOIC package; detailed transfer characteristics, exact capacitance, and response limits require the manufacturer datasheet.
Typical uses include USB 2.0 peripheral ports, USB data interfaces, external accessory connectors, USB hubs, and industrial equipment with accessible external ports. Place the protector between the connector and the protected circuitry, with short, well-impedance-controlled traces and a direct return path. The ESD path must not share sensitive signal geometry, and the protected device should remain close enough to the connector that surge energy is diverted before it reaches the controller.
The key design trade-off is protection versus signal integrity. The USB6B1RL is optimized for USB data-line protection, but the exact input capacitance, working voltage tolerance, and clamp behavior must be checked against the interface requirements. Verification should include the STMicroelectronics datasheet and connector-level ESD system requirements.
This page consolidates verified distributor availability, a manufacturer-linked datasheet reference, package information, application guidance, and honest replacement-status notes to support faster engineering comparison and sourcing.
Drop-in alternatives for USB6B1RL — 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:
USB6B1
✅ Drop-In📋 Reference alternative (not in catalog)
USB6B1RL Specifications
| Product Type | TVS diode array for ESD protection |
| Protected Lines | 2 data input lines |
| Maximum Working Voltage | 5.25 V |
| Clamping Pulse Rating | 500 W |
| Protection Topology | Full diode bridge with integrated clamping protection |
| Capacitance | Very low capacitance; exact value not provided |
| Package | 8-SOIC |
| Mounting Type | Surface mount |
| Application | USB data-line protection |
| Overvoltage Protection | Yes |
| Power-Rail Clamping | Integrated protection between the supply voltage and ground |
| Manufacturer | STMicroelectronics |
| Distributor Category | TVS diodes |
| Datasheet Availability | PDF and HTML manufacturer datasheet references available |
USB6B1RL 8-soic Pin Configuration Guide
Pin configuration for USB6B1RL (8-soic package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for USB6B1RL.
Refer to the datasheet for full pin configuration.
Typical Applications
USB6B1RL is suitable for 6 applications: USB 2.0 Peripheral Port, USB Hub Data-Line Protection, External USB Accessory Connector, Industrial USB Control Interface, USB-to-Serial Bridge Input, USB-Cto-USB-A Adapter Board.
USB 2.0 Peripheral Port
The USB6B1RL fits a USB 2.0 peripheral connector where two data conductors enter a controller or transceiver. Its 5.25 V working-voltage rating and low-capacitance TVS-array concept are appropriate for protecting high-speed data lines from connector-accessible ESD events. Mount the device immediately behind the connector, route D+ and D+ or D− and D+ consistently through the protection network, and keep the transient return path short. The protection benefit is lower risk of controller damage during contact discharge; the design trade-off is added capacitance and clamp loading, which must be checked against the USB signal requirements.
Recommended
USB Hub Data-Line Protection
USB6B1RL can be placed at each exposed USB downstream port in a hub to protect multiple low-speed and high-speed data paths from electrostatic discharge. The two-line protection structure suits conductors that require coordinated steering, while the integrated bridge provides a defined relationship to the supply rail. In a hub PCB, keep each protector close to its assigned connector and avoid sharing long, narrow ESD paths between ports. Verify the hub transceiver’s allowable capacitive loading and the exact clamp behavior before release, because the supplied data confirms the protection function but not a complete capacitance-versus-frequency curve.
Recommended
External USB Accessory Connector
The USB6B1RL is suited to accessory and cable-facing connectors that are exposed to user contact and conductive objects. Placing the protector near the connector limits the distance over which an ESD pulse can propagate toward the protected logic, while the low-capacitance construction helps preserve edge quality on the USB pair. The 500 W transient rating is a pulse capability, not a substitute for a complete ESD qualification. Validate the board’s ground reference, connector shell treatment, and system-level contact-discharge requirement against the manufacturer application guidance.
Recommended
Industrial USB Control Interface
For industrial equipment with an accessible USB maintenance or configuration port, USB6B1RL provides a compact way to protect two data lines against fast overvoltage transients. The 8-SOIC surface-mount package supports conventional PCB assembly, while the integrated bridge helps constrain voltage on the associated power rails. Industrial boards should maintain a direct low-impedance return and avoid routing protected signals through areas where switching nodes or high-current power paths can couple into the clamp network. Confirm the exact working-voltage, leakage, and temperature limits from the official datasheet before deployment.
Recommended
USB-to-Serial Bridge Input
USB6B1RL can protect the data side of a USB-to-serial bridge when the bridge is mounted behind a user-accessible connector. The protection device helps isolate the bridge pins from ESD energy arriving from the cable while its low-capacitance topology limits added loading on the USB signaling path. The implementation should place the protector before the sensitive transceiver pins and maintain symmetric routing where possible. The supplied results do not include bridge-specific capacitance limits, so validate signal integrity with the bridge vendor’s recommendations and the USB6B1RL datasheet.
Recommended
USB-Cto-USB-A Adapter Board
USB6B1RL may be used on an adapter board when the design requires discrete protection for a two-wire USB data segment. Its 8-SOIC package is suitable for surface-mount assembly, and its ESD-clamping role is complementary to the connector’s mechanical and current-rating protections. The adapter designer should place the device near the user-facing port, preserve controlled impedance, and connect the protection return directly to the board reference plane. Because the verified information does not establish USB-C high-speed compatibility or a complete USB 3.x footprint, this use should be treated as a data-line protection option rather than a universal USB-C protector.
Recommended
Recommended Products Summary
Engineering reference data for USB6B1RL — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | USB6B1 |
|---|---|---|
| Package | 8-SOIC | 8-SOIC |
| Brand | STMicroelectronics | STMicroelectronics |
| Mounting | Surface mount | Surface mount |
Key Differentiators
- Purpose-built two-line USB data protection (vs USB6B1)
- Integrated full diode bridge (vs USB6B1)
- Low-capacitance design intent (vs USB6B1)
- Established distributor availability (vs USB6B1)
Design Notes
Place USB6B1RL immediately behind the external USB connector, with the two protected data conductors routed directly to the device. Keep the ESD-current loop as short as practical and provide a low-impedance return to the board reference plane. Long traces between the connector and protector allow transient energy to spread into the protected circuit before clamping begins. Confirm the final land pattern against the STMicroelectronics package drawing.
The USB6B1RL is described as having very low capacitance, but the exact capacitance and frequency-dependent behavior are not included in the supplied results. Validate the protector against the USB controller or transceiver input capacitance, edge-rate requirements, and return-loss budget. Keep D+ and D− routing geometry consistent where possible, and do not assume that the generic 5.25 V working-voltage rating alone guarantees signal integrity at every data rate.
Do not treat the 500 W clamping rating as a continuous power rating or as proof that the device alone meets an ESD qualification requirement. Confirm the applicable contact-discharge waveform, system capacitance, connector construction, and ground strategy. Also avoid routing the high-current clamp path through sensitive analog or communication areas. The supplied evidence confirms a protection function and package, but several absolute-maximum and environmental parameters remain [DATA_NEEDED].
The device includes a full diode-bridge arrangement intended to keep the power rails within a safe limiting condition. In a board design, ensure the protected rail has a low-impedance source and return path so the transient does not transfer excessive energy into unrelated circuitry. Compare the actual rail voltage, current, and decoupling arrangement with the official datasheet before using USB6B1RL as a standalone rail-protection solution.
Compliance Information
The supplied results do not explicitly state RoHS, REACH, lead-free, halogen-free, conflict-minerals, or automotive qualification information for USB6B1RL.
