KTS1681AEUZ-TR - 4A OVP Load Switch with +100V Surge | Kinetic
Teilenummer: KTS1681AEUZ-TR ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $1.12 | $1,12 |
| 10 | $1.05 | $10,50 |
| 100 | $0.94 | $94,00 |
| 500 | $0.83 | $415,00 |
| 1.000 | $0.74 | $740,00 |
| 3.000 | $0.62 | $1.860,00 |
KTS1681AEUZ-TR Übersicht
A load switch, in this category, is a power-distribution switch that sits between an upstream supply rail and downstream electronics, controlling power-up, power-down, and fault isolation. The KTS1681A family specifically addresses overvoltage (OVP) events - it occupies the niche between discrete TVS diodes plus MOSFETs and full hot-swap controllers, integrating an internal clamp, OVP comparator, and power MOSFET into a single IC. It belongs to the broader class of power-management ICs (PMICs) and is functionally adjacent to surge suppression and eFuse devices.
Key differentiating features include an adjustable overvoltage trip threshold, a sense output for load current monitoring, an internal clamp that absorbs surges to +100 V without external TVS components, ultra-low 28 mOhm on-resistance to minimise conduction losses, and a 12-WLCSP form factor that is the smallest footprint in its class. The internal clamp eliminates the need for an external TVS diode in most 28 V hot-plug and automotive use cases.
The device architecture combines a back-to-back MOSFET configuration for true bidirectional blocking, an internal clamp for surge absorption, and an OVP comparator that triggers switch turn-off when VIN exceeds the programmed threshold. The sense output provides an analog current-mirror signal proportional to load current, simplifying accurate load-current telemetry without a series sense resistor.
Typical applications include USB Type-C VBUS protection, smartphone and tablet charging ports, hot-plug circuits on multi-rail systems, and any point-of-load where 5 V/9 V/12 V/20 V rails may be exposed to faulty or miswired supplies. The WLCSP-12 footprint is preferred over larger QFN packages when board area is at a premium.
When designing in this part, choose the OVP threshold carefully so that transient overshoot from normal hot-plug events does not falsely trigger the protection. Adequate input decoupling is required to keep the internal clamp from sustained clamping operation, which can raise junction temperature beyond the device rating.
This page synthesises distributor pricing, WLCSP-12 pin configuration, and matching same-family load switches that share the same footprint - information not consolidated on any single distributor page.
Drop-in-Alternativen für KTS1681AEUZ-TR – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
KTS1681AEUZ
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
KTS1681AFVS-TR
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
KTS1681AEUZ-TR Grenzwerte & elektrische Eigenschaften
| Product Type | Overvoltage/Surge Protection Load Switch IC |
| Manufacturer | Kinetic Technologies |
| Continuous Load Current | 4 A |
| Typical On-Resistance (RDS_ON) | 28 mOhm (typ) |
| Maximum Normal Operating Voltage (VIN_max) | +28 V DC |
| Surge Withstand (Internal Clamp) | up to +100 V |
| Overvoltage Trip Threshold | Adjustable (external resistor divider) |
| Sense Output | Yes (analog current-mirror sense) |
| Internal Switch | Yes (integrated back-to-back MOSFET) |
| Gehäuse | 12-WLCSP (1.7 x 1.21 mm) |
| Montageart | Surface Mount |
| RoHS-Status | Compliant |
| Packaging Form | Tape & Reel (TR suffix) |
KTS1681AEUZ-TR Pin-Konfiguration
| Pin A1 | VIN — Input supply voltage (up to +28 V DC normal, 100 V transient) |
| Pin A2 | VOUT — Switched output to downstream load |
| Pin A3 | GND — Ground reference |
| Pin B1 | VIN — Input supply voltage (bypass ball, place decoupling cap here) |
| Pin B2 | VOUT — Switched output to downstream load |
| Pin B3 | SENSE — Analog current-mirror sense output |
| Pin C1 | EN — Enable / logic control input |
| Pin C2 | OVP — Overvoltage threshold set (external resistor divider) |
| Pin C3 | FLG — Fault flag output (open-drain) |
| Pin D1 | GND — Ground reference (bypass ball) |
| Pin D2 | NC — Not connected (per datasheet) |
| Pin D3 | NC — Not connected (per datasheet) |
Typische Anwendungen
KTS1681AEUZ-TR ist geeignet für 6 Anwendungs: USB Type-C VBUS Protection, Smartphone Charging Port Protection, Hot-Plug and Multi-Rail Point-of-Load Protection, Industrial 24V / Miscalibrated Supply Protection, Hot-Swap / Plug-In Module Protection, Surge-Protected Test and Measurement Inputs.
USB Type-C VBUS Protection
The KTS1681AEUZ-TR is used at the VBUS input of USB Type-C ports on smartphones, tablets, and laptops to protect downstream PMICs and SoCs from miswired or faulty supplies. The 4 A load rating covers most Type-C sourcing applications up to 100 W, while the internal 100 V clamp absorbs hot-plug transients that exceed USB PD voltage steps. The WLCSP-12 1.7 x 1.21 mm outline fits directly behind the Type-C connector without PCB rework, and the adjustable OVP threshold prevents false trips during negotiated USB-PD rail handovers. Designers place the part between the connector and the TVS/CC logic, bypassing the need for a discrete TVS diode.
Empfohlen
Smartphone Charging Port Protection
In smartphone mainboards, the KTS1681AEUZ-TR protects the main charger PMIC from 5 V/9 V/12 V miswiring and industrial surge events. The 28 mOhm typical RDS_ON keeps conduction loss below 0.45 W at 4 A, preserving battery-charging efficiency, and the integrated sense output lets the fuel-gauge firmware monitor charge current without an additional sense resistor. The 100 V surge clamp satisfies IEC 61000-4-5 surge testing on the charging port without an external TVS, reducing BOM cost and Z-height.
Empfohlen
Hot-Plug and Multi-Rail Point-of-Load Protection
The KTS1681AEUZ-TR is used at point-of-load entry to hot-plug boards and rack-mount cards that may experience arcing during insertion. The 4 A continuous rating serves 5 V, 12 V and 20 V distribution rails, and the internal MOSFET turn-off at OVP threshold prevents backplane faults from propagating to downstream DC-DC converters and FPGAs. The WLCSP package fits high-density multi-rail boards where QFN footprint alternatives would exceed board area.
Empfohlen
Industrial 24V / Miscalibrated Supply Protection
In industrial 24 V environments the KTS1681AEUZ-TR protects low-voltage electronics wired to mains-derived supplies that can overshoot during load dumps or capacitor-bank switching. The adjustable OVP threshold can be programmed just above 24 V (for example 26 V) to reject normal noise, and the internal 100 V clamp absorbs load-dump surges per ISO 7637. Designers pair this part with an optocoupler-isolated downstream regulator to keep field wiring faults from destroying control boards.
Empfohlen
Hot-Swap / Plug-In Module Protection
Plug-in modules and docking stations use the KTS1681AEUZ-TR as an inline hot-swap controller with integrated OVP. Unlike a true hot-swap controller, the simpler KTS1681AEUZ-TR focuses on overvoltage rather than inrush current limiting - making it appropriate when upstream fuses or PTCs already limit inrush. The internal MOSFET turns off within microseconds of detecting an OVP event, preventing arcing-induced supply faults from reaching sensitive analog or RF front ends.
Empfohlen
Surge-Protected Test and Measurement Inputs
Test and measurement front-ends - especially bench multimeters and portable oscilloscopes that may be connected to unknown mains or battery lines - use the KTS1681AEUZ-TR to protect downstream ADC front-ends. The 100 V surge rating covers accidental contact with 48 V telecom rails or mains-derived test leads, while the 28 mOhm switch introduces negligible measurement error at low current. Designers combine the part with a downstream precision ADC such as the ADS131A04 for high-accuracy protected data-acquisition channels.
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Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für KTS1681AEUZ-TR – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | KTS1681AEUZ | KTS1681AFVS-TR |
|---|---|---|---|
| Brand | Kinetic Technologies | Kinetic Technologies | Kinetic Technologies |
| Package | 12-WLCSP (1.7 x 1.21 mm) | 12-WLCSP (1.7 x 1.21 mm) - same | 12-WLCSP - same |
| Continuous Load Current | 4 A | 4 A - identical | 4 A - identical |
| Typical RDS_ON | 28 mOhm | 28 mOhm - identical | 28 mOhm - identical |
| Maximum VIN (DC) | +28 V | +28 V - identical | +28 V - identical |
| Surge Withstand | +100 V (internal clamp) | +100 V - identical | +100 V - identical |
| OVP Threshold | Adjustable | Adjustable - identical | Factory-set variant |
| Packaging Form | Tape & Reel (TR) | Tube / bulk (non-TR) | Tape & Reel |
Wichtigste Unterscheidungsmerkmale
- Integrated 100 V surge clamp vs external TVS-plus-MOSFET (vs. Discrete TVS diode + N-channel MOSFET reference design)
- Sense output without external sense resistor (vs. Generic OVP load switch without current telemetry)
- Smallest WLCSP-12 outline in OVP-class (vs. QFN-10 / QFN-12 OVP switches)
Designhinweise
Estimated: at 4 A load and 28 mOhm typical RDS_ON, conduction loss is about 0.45 W, which the WLCSP-12 package must dissipate into the PCB. Use at least 0.5 sq inch of continuous copper plane on the VOUT and GND balls, with thermal vias stitching to inner copper layers, to keep junction temperature rise below 30 C. If the application sits near 4 A continuously, derate to 3 A for additional reliability margin.
Place a low-ESR 22 uF ceramic input capacitor as close as possible to the VIN balls to keep the internal 100 V clamp from sustained operation during surge events. Add a 10 uF ceramic on VOUT to minimise voltage droop during MOSFET turn-off. Route the OVP divider traces in parallel with short, equal-length paths to avoid OVP threshold drift from leakage or noise pickup; place the divider within 5 mm of the OVP ball.
Do not operate continuously above +28 V DC - the part is intended for 28 V typical rails with intermittent surge handling to 100 V only. Set the OVP threshold above the maximum normal supply including transients but below the absolute maximum, otherwise nuisance trips or clamped operation degrade long-term reliability. When used with inductive loads ensure TVS protection on VOUT, as the part does not absorb inductive flyback energy.
Compliance-Informationen
RoHS compliance confirmed by DigiKey, Mouser, and JLCPCB listing. REACH, halogen-free, and conflict-mineral declarations are not stated in the verified snippets and would be confirmed from the manufacturer declaration.
