ISL61851JCBZ - Dual USB Hot Swap Controller, 2.5-5V | Renesas
N.º de pieza: ISL61851JCBZ ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $1.85 | $1,85 |
| 10 | $1.62 | $16,20 |
| 100 | $1.38 | $138,00 |
| 500 | $1.18 | $590,00 |
| 1.000 | $1.05 | $1.050,00 |
ISL61851JCBZ Descripción general
A USB hot swap controller is a specialized power-management IC that sits between the system supply (typically 5V) and the USB VBUS pin, providing inrush current limiting, electronic circuit-breaker protection, and fault isolation when downstream peripherals short or overload the bus. As part of the broader hot-swap controller category, it sits hierarchically under power management IC and ultimately under power semiconductor/analog IC taxonomy. The ISL6185 family uses internal N-channel MOSFETs to eliminate the external FET selection normally required, simplifying USB port implementation on motherboards, hubs, and embedded platforms.
Key features of the ISL61851JCBZ include independent OC fault outputs per channel, active-high enable inputs, automatic retry after fault clearing, low quiescent current draw for standby compliance, and thermal shutdown protection. The 8-pin SOIC package offers compact PCB footprint compatible with hand-solderable and reflow-solderable assembly, suitable for densely populated USB hub designs.
Internally, each channel combines a low-RDS(on) MOSFET, a charge pump for gate drive, a current-sense comparator, and a fault timer to deliver a complete self-protected switch in a single IC. The active-high enable logic permits software-controlled port power gating, useful for battery-powered hosts that need to suspend USB bus power to save energy.
Typical applications include dual-port USB 2.0 hubs, USB host ports on industrial single-board computers, embedded USB charging ports, and any platform that needs UL-recognized per-port overcurrent protection without discrete MOSFETs. Compared with discrete FET + current-sense designs, this part reduces BOM count, board area, and qualification complexity for USB-IF compliance testing.
When laying out this part, place input and output bulk capacitors within 5 mm of the device to support the hot-swap inrush profile, and ensure the exposed copper pad (where applicable) has sufficient thermal relief for the worst-case continuous 1 A per channel dissipation. Designers should verify fault timing against the USB 2.0 specification Section 7.1.2 voltage-drop tolerance when selecting upstream capacitance.
This page synthesizes distributor pricing, drop-in same-family alternatives, and practical design notes not consolidated in the manufacturer datasheet, with values sourced from the Renesas ISL6185 datasheet family and DigiKey/Mouser distributor listings as of 2026-10-08.
Alternativas directas para ISL61851JCBZ — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
ISL61851JCBZ-T
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ISL61851JIBZ
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ISL61853JCBZ
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ISL61855JCBZ
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ISL61852JCBZ
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
ISL61853JIBZ
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
ISL61851JCBZ Especificaciones
| Función | Dual USB Hot Swap Controller with integrated MOSFET |
| Number of Channels | 2 (fully independent) |
| Operating Input Voltage | 2.5 V to 5.5 V |
| Continuous Load Current | approximately 1 A per channel |
| Enable Input Logic | Active-high |
| Fault Output | Open-drain / active-low fault flag per channel |
| Rango de temperatura de funcionamiento | 0 C to +70 C (commercial, JCBZ suffix) |
| Encapsulado | 8-pin SOIC (JCBZ suffix) |
| Tipo de montaje | Surface Mount |
| Fault Protection | Overcurrent (OC), thermal shutdown, inrush current limiting |
| Auto-Retry After Fault | Yes (per datasheet description) |
| Nivel MSL | 1 (per SOIC-8 standard) |
| Estado RoHS | Compliant |
| Original Manufacturer | Intersil (now part of Renesas) |
Configuración de pines de ISL61851JCBZ
| Pin 1 | EN1 — Enable input for channel 1 (active-high) |
| Pin 2 | IN — Input supply voltage (2.5 V to 5 V) |
| Pin 3 | OUT1 — Switched output for channel 1 (USB VBUS port 1) |
| Pin 4 | FAULT1 — Open-drain fault output for channel 1 (active-low) |
| Pin 5 | GND — Ground reference |
| Pin 6 | FAULT2 — Open-drain fault output for channel 2 (active-low) |
| Pin 7 | OUT2 — Switched output for channel 2 (USB VBUS port 2) |
| Pin 8 | EN2 — Enable input for channel 2 (active-high) |
Aplicaciones típicas
ISL61851JCBZ es adecuado para 6 aplicacións: USB 2.0 Dual-Port Hub Power Switching, Industrial Single-Board Computer USB Host Ports, Embedded USB Charging Port (BC 1.2), Automotive Infotainment USB Port Protection, USB Port Power Switching in Test & Measurement Equipment, Network Router/Switch USB Management Port.
USB 2.0 Dual-Port Hub Power Switching
The ISL61851JCBZ is purpose-built for two-port USB 2.0 hubs where each downstream VBUS requires independent overcurrent isolation from a single 5V rail. With dual integrated MOSFET switches in one SOIC-8, the part replaces a discrete FET-plus-sense-resistor-plus-comparator design on each port, cutting BOM count by roughly half and shrinking the hub PCB. Per-port OC fault outputs let the hub controller light an LED or report the fault to the host without adding glue logic. The 2.5V to 5V input range tolerates USB suspend-mode voltage droops without spurious tripping.
Recomendado
Industrial Single-Board Computer USB Host Ports
In SBC and panel-PC designs, the ISL61851JCBZ provides per-port hot-swap protection directly on the 5V rail feeding the USB-A receptacles. The integrated MOSFET and fault timer reduce the protection footprint enough to fit two ports under the SOIC-8 land pattern on a 4-layer board. Industrial-grade ISL61851JIBZ variants extend operation to -40C to +85C for factory-floor enclosures. Compared with discrete polyfuse protection, this part offers faster OC response and a logic-level fault signal for the SBC firmware to react.
Recomendado
Embedded USB Charging Port (BC 1.2)
For embedded charging-only USB ports in kiosks, point-of-sale terminals, and medical carts, the ISL61851JCBZ delivers regulated 5V power with per-port OC isolation. The active-high enable lets the host MCU gate each port independently for scheduled charging cycles. Hot-swap inrush control prevents nuisance tripping when devices with large input bulk capacitors are attached. The SOIC-8 footprint simplifies the BOM to one IC per two ports, helping small-form-factor charging modules meet cost targets.
Recomendado
Automotive Infotainment USB Port Protection
While the JCBZ suffix is commercial-grade, the ISL6185 architecture is widely used as a reference for automotive USB protection designs where dual-port hot-swap isolation is needed from a 5V rail. In cabin applications the part survives engine-start voltage drops thanks to the 2.5V minimum operation. The integrated OC and thermal protection helps meet ISO 7637-2 transient immunity targets when paired with upstream TVS protection. Designers requiring full AEC-Q100 should select the automotive-qualified Renesas ISL6185XXI family.
Recomendado
USB Port Power Switching in Test & Measurement Equipment
Bench instruments such as oscilloscopes and protocol analyzers often expose USB host ports for firmware updates or device-under-test interfacing. The ISL61851JCBZ protects the instrument's internal 5V rail from shorted USB cables or DUT miswiring. Independent FAULT outputs let the instrument's front panel indicate which port faulted, speeding bench troubleshooting. The part's small SOIC-8 package fits easily on the instrument's rear-panel USB daughter board.
Recomendado
Network Router/Switch USB Management Port
Enterprise routers and switches frequently include a USB management or 4G/5G modem port that must be hot-swappable without bringing down the host system. The ISL61851JCBZ provides the OC protection and enable control for this single- or dual-port management interface. The integrated MOSFET keeps the protection BOM to one IC per management port, leaving board space for the main Ethernet PHYs. Active-high enable is ideal for tying the USB power to the router's standby rail for sleep-mode operation.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para ISL61851JCBZ — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | ISL61851JCBZ-T | ISL61851JIBZ | ISL61853JCBZ | ISL61855JCBZ | ISL61852JCBZ |
|---|---|---|---|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics |
| Package | SOIC-8 | SOIC-8 - same | SOIC-8 - same | SOIC-8 - same | SOIC-8 - same | SOIC-8 - same |
| Channels | 2 (dual USB) | 2 | 2 | 2 | 2 | 2 |
| Input Voltage Range | 2.5 V to 5 V | 2.5 V to 5 V | 2.5 V to 5 V | 2.5 V to 5 V | 2.5 V to 5 V | 2.5 V to 5 V |
| Temperature Grade | Commercial 0C to +70C | Commercial 0C to +70C | Industrial -40C to +85C | Commercial 0C to +70C | Commercial 0C to +70C | Commercial 0C to +70C |
| Enable Polarity | Active-high | Active-high | Active-high | Active-high | Active-high | Active-high |
| Fault Behavior | Auto-retry after fault clearing | Auto-retry | Auto-retry | Auto-retry (different OC threshold) | Auto-retry (different OC threshold) | Latched fault |
| OC Threshold Profile | ISL61851 family default | Same as this product | Same as this product | Different (ISL61853 profile) | Different (ISL61855 profile) | Same as ISL61851 default |
Diferenciadores clave
- Dual-channel integrated MOSFET in single SOIC-8 (frente a Discrete FET + sense resistor + comparator)
- Active-high enable logic per channel (frente a ISL6185 active-low enable variants)
- Auto-retry fault recovery (no latched fault) (frente a ISL61852JCBZ latched variant)
- Commercial 0C to +70C temperature grade for cost-sensitive USB hubs (frente a ISL61851JIBZ industrial-grade sibling)
Notas de diseño
Place a 1 uF ceramic bypass capacitor within 5 mm of the IN pin and a 10 uF or larger low-ESR bulk capacitor at each OUT pin to support the USB hot-swap inrush profile. Keep the high-current OUT traces at least 1.5 mm wide on a 1 oz copper layer to handle 1 A continuous. Route the FAULT traces away from the OUT switching nodes to avoid capacitive coupling into the open-drain output. The SOIC-8 GND pin should be tied to a low-impedance ground pour for stable fault comparator reference.
Estimated: at 5 V input, 0.5 A continuous per channel, and a typical on-resistance of approximately 100 milliohms (per ISL6185 family), each channel dissipates roughly 25 mW; combined dissipation for both channels is about 50 mW, well within SOIC-8 thermal limits (theta_JA around 150 C/W). If designing near 1 A continuous per channel, double-check junction rise against the SOIC-8 land pattern copper area on your specific PCB. Add a thermal via array under the SOIC-8 GND pad if both channels run continuously above 0.7 A.
Do not float the EN pins - leave them undriven, and the internal pull may keep the channel in an undefined state. Tie each EN pin to IN through a 100 kohm resistor if a default-on behavior is needed. Avoid using the FAULT pin as a logic-level high-current driver - it is open-drain and must be pulled up to the host GPIO voltage with an external resistor. Verify the upstream supply can source the inrush surge; USB ports are notorious for nuisance tripping when bulk capacitance is over 220 uF downstream.
Keep the IN and OUT traces separated to prevent load current from disturbing the input rail during hot-swap events. Place the part close to the USB connector to minimize the parasitic inductance of the OUT-to-VBUS trace. For EMI-sensitive designs, add a ferrite bead on OUT in series to damp the inrush di/dt edge. The 8-pin SOIC land pattern should follow IPC-7351 SOIC-8 nominal density guidelines.
Información de cumplimiento
RoHS and lead-free compliant per Renesas/Intersil product page. JCBZ suffix denotes commercial temperature grade; not AEC-Q100 qualified - choose ISL6185XXI suffix or Renesas automotive USB protection family for AEC-Q100.
