ISL61851BCBZ-T - Dual USB Hot-Swap Controller, 2.5-5V, 8-SOIC | Renesas
Référence : ISL61851BCBZ-T ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $1.22 | $1,22 |
| 10 | $1.1 | $11,00 |
| 100 | $0.95 | $95,00 |
| 500 | $0.85 | $425,00 |
| 1 000 | $0.75 | $750,00 |
| 2 500 | $0.68 | $1 700,00 |
ISL61851BCBZ-T Présentation
A hot-swap controller is an integrated circuit that safely powers up a load (such as a USB port or plug-in card) while limiting inrush current, detecting faults, and isolating the downstream bus from a faulty or shorted load. Within the broader taxonomy, a hot-swap controller is a member of the power-management IC family, which also includes LDOs, DC-DC converters, and supervisors. Hot-swap controllers are especially critical in USB hubs, hot-plug PCIe cards, and any system where external cabling or removable loads can present transient or sustained faults.
Key features of the ISL61851BCBZ-T include two independent OC-protected switches, low on-resistance internal N-channel MOSFETs, automatic fault recovery with retry, an enable input that is active-HIGH on the "B" variant, and per-channel fault flags. The part is part of the ISL6185xxC family of sixteen functional variants covering enable polarity, fault-response behavior, and temperature range. This product family provides a USB-port power switch with the protection features required by USB 2.0/3.0 host and hub implementations.
Technically, each ISL61851 channel integrates a current-sensing MOSFET structure that compares load current against an internal reference. When the threshold is exceeded the controller latches off (or auto-retries, depending on the variant) and asserts a FAULT# output. The enable (EN) pin is active-high in the ISL61851BC variant. Operating from a 2.5 V to 5 V supply, the device is fully compatible with USB VBUS rails and supports both USB 2.0 high-power (500 mA) and USB 3.0 (900 mA) port profiles.
Typical applications include USB hubs (standalone and motherboard-integrated), motherboard add-in cards with USB ports, docking stations, embedded systems providing host USB power, and any 5 V rail that must survive short-circuit events. The dual-channel integration halves the board area compared to two discrete switches.
When designing with this part, place input and output bulk capacitors close to the device pins to control inrush, choose the upstream supply with adequate headroom, and tie FLG# pins to the system controller so it can announce port faults to the host. The drop-in variants in the same SOIC-8 footprint share the pinout and most electrical parameters, simplifying second-source qualification.
Alternatives de remplacement direct pour ISL61851BCBZ-T — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
ISL61851ACBZ-T
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ISL61851ICBZ-T
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ISL61851BCBZ
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ISL61851ACBZ
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ISL61851ICBZ
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ISL61851BCBZ-T Spécifications
| Fonction | Dual USB Hot-Swap Power Supply Controller |
| Number of Channels | 2 |
| Plage de tension d'entrée | 2.5 V to 5 V |
| Enable Polarity | Active-HIGH (B variant) |
| Plage de température de fonctionnement | 0 °C to +70 °C (commercial, "C" suffix) |
| Boîtier | 8-SOIC (0.154", 3.90 mm width) |
| Type de montage | Surface Mount |
| Delivery Form | Tape and Reel ("-T" suffix) |
| Family | ISL6185xxC (16 functional variants) |
| Fault Output | Per-channel FLG# pin |
| Internal MOSFET | Yes (integrated N-channel switch per channel) |
Configuration des broches de ISL61851BCBZ-T
| Broche 1 | IN1 — Channel 1 input supply (2.5V to 5V) |
| Broche 2 | EN1 — Channel 1 enable input (active-HIGH for BC variant) |
| Broche 3 | FLG1# — Channel 1 fault flag output (active-LOW, open-drain) |
| Broche 4 | GND — Ground |
| Broche 5 | OUT — Switched output (common for both channels) |
| Broche 6 | FLG2# — Channel 2 fault flag output (active-LOW, open-drain) |
| Broche 7 | EN2 — Channel 2 enable input (active-HIGH for BC variant) |
| Broche 8 | IN2 — Channel 2 input supply (2.5V to 5V) |
Applications typiques
ISL61851BCBZ-T convient pour 6 applications: Standalone USB 2.0/3.0 Hub, Motherboard Add-in USB Port Card, Docking Station USB Power Path, Embedded Industrial USB Host Port, USB Charging Port (Tablet/Phone Charger Hub), Set-Top Box / Smart TV USB Ports.
Standalone USB 2.0/3.0 Hub
The ISL61851BCBZ-T's two-channel integrated-FET design fits perfectly in standalone USB hubs where each downstream port requires independent overcurrent protection. With a 2.5-5V input range matching VBUS and factory-trimmed current limits, the device eliminates the sense resistor, two discrete MOSFETs, and a separate hot-swap controller per port - reducing BOM cost and board area by roughly 60% versus discrete implementations. Fault flags tie directly to the hub's MCU for per-port status reporting.
Recommandé
Motherboard Add-in USB Port Card
Desktop motherboard add-in cards with USB ports require UL-listed overcurrent protection that the ISL61851BCBZ-T provides out-of-the-box. Each channel's integrated N-channel MOSFET handles the full USB VBUS current and trips within microseconds on a downstream short, protecting both the motherboard 5V rail and the add-in card connector. The 8-SOIC footprint allows the protection IC to sit directly behind each USB jack without taking valuable PCB real estate.
Recommandé
Docking Station USB Power Path
Docking stations that expose 4-8 USB ports typically use multiple ISL61851BCBZ-T ICs in a star configuration, each protecting two ports from laptop-side faults. The device's active-HIGH enable input allows the docking station's MCU to power-cycle individual ports when devices misbehave, while the per-channel FLG# output reports the fault to the host PC for diagnostic logging. Industrial temp variants are available for rugged docking stations.
Recommandé
Embedded Industrial USB Host Port
Industrial PCs, HMIs, and factory automation controllers must survive USB cable shorts and ESD events on field wiring. The ISL61851BCBZ-T isolates the 5V rail from faults within microseconds, and the industrial-temp ISL61851ICBZ-T variant extends operation to -40C to +85C. Designers can wire the FLG# pins back to the host SoC to log port shutdowns in SCADA systems for predictive maintenance.
Recommandé
USB Charging Port (Tablet/Phone Charger Hub)
Multi-port USB charging hubs use the ISL61851BCBZ-T to provide safe 5V power for phones and tablets without exposing the upstream supply to short-circuit damage. The integrated MOSFET handles the 1.5-2.4A charging currents demanded by modern devices, while per-port OC protection ensures one faulty cable does not take down the entire charging station. Compact 8-SOIC packaging keeps the hub design slim.
Recommandé
Set-Top Box / Smart TV USB Ports
Set-top boxes and smart TVs typically expose two USB ports for media playback or external storage. The ISL61851BCBZ-T protects the TV's internal 5V supply from a shorted USB stick or a back-driven powered device. Its commercial 0C to +70C temperature range comfortably covers the thermal environment inside a TV chassis, and its small footprint fits adjacent to the USB jack shield.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour ISL61851BCBZ-T — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | ISL61851ACBZ-T | ISL61851ICBZ-T | ISL61851BCBZ | ISL61851ACBZ | ISL61851ICBZ |
|---|---|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same |
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics |
| Enable Polarity | Active-HIGH | Active-LOW | Active-HIGH | Active-HIGH | Active-LOW | Active-HIGH |
| Temperature Range | 0 °C to +70 °C (commercial) | 0 °C to +70 °C (commercial) | -40 °C to +85 °C (industrial) | 0 °C to +70 °C (commercial) | 0 °C to +70 °C (commercial) | -40 °C to +85 °C (industrial) |
| Shipping Form | Tape and Reel (-T) | Tape and Reel (-T) | Tape and Reel (-T) | Tube (no -T) | Tube (no -T) | Tube (no -T) |
| Number of Channels | 2 | 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 |
| Integrated MOSFET | Yes (per channel) | Yes (per channel) | Yes (per channel) | Yes (per channel) | Yes (per channel) | Yes (per channel) |
Principaux différenciateurs
- Only variant with active-HIGH enable in commercial temp range (vs ISL61851ACBZ-T)
- Commercial temperature range with active-HIGH enable (vs ISL61851ICBZ-T)
- Tape-and-reel packaging for high-volume SMT (vs ISL61851BCBZ)
Notes de conception
Place a low-ESR 1 µF to 10 µF ceramic bypass capacitor on each IN1/IN2 pin, within 5 mm of the IC. The integrated MOSFET's inrush behavior depends on this capacitance; undersized bulk capacitance causes the OC comparator to false-trip on USB hot-plug events. Add a 22 µF or larger aluminum-polymer bulk capacitor on the common OUT node to absorb downstream load transients.
Estimated: at a continuous 1 A load per channel with RDS(ON) of ~100 mΩ, each channel dissipates roughly 100 mW. The 8-SOIC package has a theta_JA of approximately 110 °C/W, so a single-channel 1 A load raises junction temperature ~11 °C above ambient. For both channels at full load simultaneously, derate by 20-30% or use the industrial-temp ISL61851ICBZ-T variant which has identical thermal characteristics.
Route the OUT trace to the USB connector with at least 30 mil (0.76 mm) copper width to carry USB 3.0 inrush currents without significant voltage drop. Keep the FLG# traces away from the OUT switching node to prevent capacitive coupling from falsely asserting the fault signal. A ground pour under the IC is recommended to provide thermal relief and a low-impedance return path for the OC comparator.
Do not leave FLG# pins floating - they are open-drain and require a 10 kΩ to 100 kΩ pull-up to the system logic rail. Failing to pull them up means the host controller never sees a fault assertion. Also verify that the EN pins are driven to a defined logic level at power-up; floating EN inputs on the active-HIGH BC variant can leave the switch in an indeterminate state during system bring-up.
Informations de conformité
Compliance data not provided in verified web results; IC variants available for industrial but not AEC-Q100 automotive qualification.
