ISL61861AIBZ - 1.5A USB Hot-Swap Controller, 8-SOIC | Renesas
N.º de pieza: ISL61861AIBZ ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $1.18 | $1,18 |
| 10 | $1.05 | $10,50 |
| 100 | $0.92 | $92,00 |
| 500 | $0.81 | $405,00 |
| 1.000 | $0.72 | $720,00 |
ISL61861AIBZ Descripción general
A USB hot-swap controller is a specialty power management IC (PMIC) that sits between a system supply rail and a downstream USB VBUS load. Its role is to soft-start the port, limit inrush current, isolate hot-plug transients, and disconnect the port on persistent overcurrent - functions that protect both the host backplane and the attached device. Within the broader PMIC hierarchy, hot-swap controllers sit alongside eFuse ICs, load switches, and ORing controllers, and are typically deployed behind a buck regulator that generates the +5 V USB rail.
Key features of the ISL61861AIBZ include: 45 mOhm integrated P-channel MOSFET, 1.5 A nominal continuous load current, latched fault output that requires manual restart, logic-level active-high enable input, and an internal charge pump that drives the PFET gate. The 8-SOIC package provides a thermal pad via pin 5 (GND/tab) and is footprint-compatible with the 8-SOIC eFuse pinout used by many competing vendors, which simplifies multi-source PCB layouts.
Typical applications include USB port power distribution in industrial PCs, embedded single-board computers, set-top boxes, and telecom line cards where each downstream port must survive fault events without disrupting the upstream supply. The ISL61861AIBZ's latched-off behavior is preferred when fault persistence should disable the port until the host CPU clears the fault bit.
When designing with this part, place input and output bulk capacitors per the USB 2.0 specification (120 uF max on VBUS downstream) and observe the layout guidelines in the manufacturer datasheet to keep the high-current return path impedance low. Choose the ISL61861II variant for auto-retry behavior; choose the ISL61862/3 variants if you need 3.3 V auxiliary logic or independent dual-channel control.
This page synthesizes distributor pricing, drop-in alternatives, application notes, and parametric comparison not consolidated on any single distributor page, providing engineers a one-stop reference for USB port power design with the ISL6186 family.
Alternativas directas para ISL61861AIBZ — 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:
ISL61861IIRZ
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ISL61861ACBZ
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ISL61862IBZ
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ISL61863IBZ
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MAX1607ESA
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ISL61861AIBZ Especificaciones
| Product Type | USB Hot-Swap Power Controller |
| Canales | 1 (Single) |
| Input Supply Voltage Range | 2.5 V to 5.5 V |
| Continuous Load Current | 1.5 A |
| Integrated Pass Element | 45 mOhm P-channel MOSFET |
| Fault Behavior | Latched (manual restart required) |
| Enable Input | Logic-level, active high |
| Rango de temperatura de funcionamiento | -40C to +85C (Industrial) |
| Encapsulado | 8-SOIC (150 mil, 3.90 mm body) |
| Tipo de montaje | Surface Mount |
| Estado RoHS | Compliant |
| Target Application | USB 2.0 / USB 3.0 VBUS power switching |
| Rise Time Control | Internal soft-start (dV/dt limited) |
| Recuento de pines | 8 |
Configuración de pines de ISL61861AIBZ
| Pin 1 | EN — Logic-level enable input (active high); pull high to enable port |
| Pin 2 | VIN — Input supply voltage (2.5 V to 5.5 V); place 1 uF ceramic bypass close to pin |
| Pin 3 | VOUT — Switched output to USB VBUS load |
| Pin 4 | GND — Ground return and thermal pad connection |
| Pin 5 | FLG — Fault output indicator (open-drain, asserts low on latched fault) |
| Pin 6 | NC — Not connected (per datasheet) |
| Pin 7 | NC — Not connected (per datasheet) |
| Pin 8 | NC — Not connected (per datasheet) |
Aplicaciones típicas
ISL61861AIBZ es adecuado para 6 aplicacións: Industrial USB Port Power Distribution, Embedded SBC VBUS Hot-Swap Protection, Telecom Line Card USB Maintenance Port, Set-Top Box USB Recording Port, Medical Device USB Isolated Port, POS Terminal USB Peripheral Power.
Industrial USB Port Power Distribution
The ISL61861AIBZ is purpose-built for USB VBUS power switching on industrial PCs and embedded single-board computers where each downstream port must survive a fault event without disturbing the upstream 5 V rail. Its 45 mOhm integrated P-channel MOSFET delivers the 1.5 A continuous rating mandated by USB 3.0 while the latched-fault response holds the port off until the host CPU services the interrupt. In a typical 4-port hub, four ISL61861AIBZ devices sit behind a 5 V buck regulator and feed VBUS through per-port ESD protection. Designers benefit from the -40C to +85C industrial rating, which removes the need for thermal derating in fanless enclosures. Compared with discrete hot-swap controllers, the integrated PFET cuts PCB area by roughly 60% and eliminates gate-drive timing risks that complicate multi-port layouts.
Recomendado
Embedded SBC VBUS Hot-Swap Protection
Single-board computers such as the Raspberry Pi Compute Module carrier or NXP i.MX8M SOM integrate USB host ports that need isolated hot-plug behavior. The ISL61861AIBZ, placed between the carrier's 5 V rail and each downstream USB-A or USB-C VBUS pin, provides the soft-start, current limit, and fault latch that the host SoC cannot supply on its own. With a 45 mOhm RDSon and 1.5 A continuous rating, it absorbs the worst-case USB inrush envelope (per USB-IF compliance) without sagging the upstream rail. The latched-fault behavior is especially valuable in fielded SBCs where a downstream device failure should not silently brown-out the host. Renesas recommends 22 uF minimum on the device output and 1 uF on the input per the ISL6186 datasheet.
Recomendado
Telecom Line Card USB Maintenance Port
Telecom line cards often expose a USB-B maintenance port on the front panel for service technician laptops. The ISL61861AIBZ provides isolated, fault-protected VBUS for that port, ensuring a shorted cable or ESD event does not propagate into the central-office backplane. Its 2.5 V to 5.5 V operating range accepts the standard -48 V to 5 V brick output directly, while the -40C to +85C industrial rating tolerates the temperature swings typical of telecom closet environments. The latched-fault response is preferred over auto-retry in this application because repeated hot-cycling of a service-port short can induce cumulative stress on adjacent cards. Pair the ISL61861AIBZ with a TVS diode on VBUS for full IEC 61000-4-2 immunity in the field.
Recomendado
Set-Top Box USB Recording Port
Set-top boxes (STBs) typically include a front-panel USB-A port for DVR recording to an external hard drive. The ISL61861AIBZ isolates the STB's main 5 V supply from the high inrush current of a spinning HDD hot-plug event, while the latched-fault behavior prevents a marginal cable from repeatedly tripping the port and corrupting in-progress recordings. The 45 mOhm RDSon produces less than 100 mV drop at 1.5 A, well within USB VBUS tolerance. Inside the chassis, the 8-SOIC package sits easily behind the USB connector on a 4-layer PCB, and the device's enable pin can be tied to the STB's GPIO so the port can be powered down in standby mode for energy compliance.
Recomendado
Medical Device USB Isolated Port
Patient-monitoring equipment often includes a USB port for clinician laptop data export, and IEC 60601-1 requires the port to be patient-auxiliary isolated from the mains. The ISL61861AIBZ, paired with a USB digital isolator and a small isolated 5 V supply, provides the fault-protected VBUS half of that interface. Its latched-fault behavior combined with the downstream isolator ensures that a hot-plug short on the laptop side does not bridge the isolation barrier or disturb the patient's monitor readings. The -40C to +85C industrial rating accommodates the warm-up temperature rise inside a sealed medical enclosure. Designers should validate that the chosen isolator's upstream supply can deliver the 1.5 A inrush budget the ISL61861AIBZ requires.
Recomendado
POS Terminal USB Peripheral Power
Point-of-sale terminals connect barcode scanners, receipt printers, and customer displays over USB, often through cables that get yanked repeatedly during a retail shift. The ISL61861AIBZ protects the POS motherboard's 5 V rail from the resulting hot-unplug transients and connector short events. Its latched-fault response holds the port off after a fault, signaling the POS application that the peripheral must be re-enumerated before the cashier can continue the transaction. The 8-SOIC footprint and integrated PFET make it ideal for the slim chassis of a modern POS terminal where PCB area is at a premium. Renesas' long-term supply commitment also suits the 7-10 year lifecycle typical of retail hardware.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para ISL61861AIBZ — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | ISL61861IIRZ | ISL61861ACBZ | ISL61862IBZ | ISL61863IBZ | MAX1607ESA |
|---|---|---|---|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Analog Devices |
| Package | 8-SOIC | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same |
| Channels | 1 | 1 | 1 | 2 | 2 | 1 |
| Continuous Load Current | 1.5 A | 1.5 A | 1.5 A | 1.5 A per channel | 1.5 A per channel | 0.6 A |
| RDSon (typ) | 45 mOhm | 45 mOhm | 45 mOhm | 45 mOhm per channel | 45 mOhm per channel | ~120 mOhm |
| Fault Behavior | Latched | Auto-retry | Latched | Latched | Latched | Latched |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C | 0C to +70C (Commercial) | -40C to +85C | -40C to +85C | -40C to +85C |
| Input Voltage Range | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.7 V to 5.5 V |
| Approx Unit Price (qty 1) | $1.18 | ~$1.20 | ~$0.95 | ~$1.85 | ~$1.85 | ~$2.40 |
Diferenciadores clave
- Latched-fault response vs auto-retry in same family (frente a ISL61861IIRZ)
- Industrial temperature grade with same pinout as commercial (frente a ISL61861ACBZ)
- Lower RDSon than cross-brand equivalents (frente a MAX1607ESA)
- Single-channel focus vs dual-channel dual-purpose (frente a ISL61862IBZ / ISL61863IBZ)
Notas de diseño
Estimated: at 5 V input, 1.5 A output, and 45 mOhm RDSon, the ISL61861AIBZ dissipates roughly (5 V x 1.5 A x 45 mOhm / 5 V) ~= 0.10 W through its integrated PFET, plus quiescent current of approximately 110 uA. The 8-SOIC package's theta_JA of ~110 C/W on a JEDEC 4-layer board yields a junction temperature rise of ~11C above ambient at full load, well within the 125C maximum. No external heatsink is required, but the device footprint copper area should be maximized per the datasheet's land-pattern recommendation to spread heat into the inner layers.
Place a 1 uF X7R ceramic bypass capacitor within 2 mm of the VIN pin to suppress the inrush transient generated when EN transitions high. Place a 22 uF minimum bulk capacitor on VOUT (per USB 2.0 spec the downstream VBUS bulk can be up to 120 uF; verify against your downstream device's inrush tolerance). Keep the high-current return path (VOUT load return to pin 4 GND) short and wide - ideally a flooded ground plane on layer 2 - to avoid ground bounce that could trip the current-limit comparator falsely.
Do not leave the EN pin floating - it must be driven logic-high or pulled low through a known-good resistor; an undriven EN pin can drift into the linear region and cause partial turn-on of the internal PFET, resulting in excessive dissipation. Do not assume the FLG output is push-pull - it is open-drain and requires a pull-up resistor (typically 100 kOhm to VIN) for the host MCU to read correctly. Finally, do not exceed the 5.5 V absolute-maximum rating on VIN even during hot-plug transients; add a TVS such as SMAJ5.0CA if the upstream rail is long or inductive.
Per Renesas application notes, route VIN and VOUT traces on opposite sides of the IC to minimize the loop inductance that contributes to ringing at turn-off. The exposed thermal pad (pin 5 GND) must be soldered to a generously sized copper pour on the top layer with at least 4 thermal vias to inner ground planes to keep junction temperature within spec. Avoid routing digital signals (EN, FLG) directly under the IC body to prevent capacitive coupling that could corrupt fault-flag timing.
Información de cumplimiento
RoHS and lead-free per Renesas product page; industrial temperature grade is not AEC-Q100 qualified - automotive applications require a separate automotive-suffix variant. REACH SVHC compliance maintained on the Renesas compliance portal.
