TPS259533DSGT - 2.7-18V, 4A eFuse w/ OVP | TI | WSON-8
MPN: TPS259533DSGT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.16 | $1.16 |
| 10 | $1.05 | $10.50 |
| 100 | $0.9 | $90.00 |
| 500 | $0.78 | $390.00 |
| 1,000 | $0.68 | $680.00 |
| 3,000 | $0.55 | $1,650.00 |
TPS259533DSGT Overview
An eFuse (electronic fuse) is a semiconductor power switch that combines a back-to-back MOSFET, current-limit loop, OVP/UVLO comparators, and thermal foldback into a single IC, replacing discrete hot-swap controllers plus an external FET and sense resistor. In the broader taxonomy it is a hot-swap controller > load switch > power management IC > semiconductor. Engineers reach for an eFuse when they need a controlled inrush, fast fault isolation, and a small board footprint on rails such as 5 V, 12 V, or USB-PD VBUS.
Key features of the TPS259533DSGT include a 34 mΩ typical RON (full internal FET), a 0.5 A to 4 A adjustable current-limit range set by a single external resistor, a 5 µs OVP response time with a 13.7 V clamp (the highest of the three TPS2595xx OVP options), an operating input voltage of 2.7 V to 18 V (20 V abs max, 18 V for the 'xx5' version), and integrated thermal shutdown. The WSON-8 2x2 mm package offers a low θJA footprint suitable for space-constrained adapter and PoE daughter boards.
Internally the device uses TI's NMOS hot-swap architecture with an integrated charge pump to drive the back-to-back FETs. The OVP comparator continuously monitors VIN against the internal 13.7 V reference and latches the FET off in microseconds when exceeded, then auto-retries when VIN returns below the clamp. Current limit is set by an external resistor on the ILIM pin and is further trimmed by the die temperature for a true I²t fault profile, distinguishing it from simple polyfuse or P-channel load switches.
Typical applications are 12 V hot-swap rails in industrial PCs, USB-PD source protection, fan and motor driver supply protection, and any 12 V/15 V adapter-fed rail that may see transients above the rated voltage. It is also used as a downstream companion after a buck converter to add resettable fault protection.
When designing in this part, route VIN, VOUT, and the thermal pad with wide copper pours; the internal FET dissipates I²S x RON continuously during a fault. Place the ILIM resistor as close to pin 6 as possible to avoid noise pickup on the current-limit loop.
This page consolidates distributor pricing, verified drop-in alternatives, and engineering design guidance that go beyond the datasheet's feature list.
Drop-in alternatives for TPS259533DSGT — 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:
TPS259533DSGR
✅ Drop-In📋 Reference alternative (not in catalog)
TPS259531DSGR
✅ Drop-In📋 Reference alternative (not in catalog)
TPS259530DSGR
✅ Drop-In📋 Reference alternative (not in catalog)
TPS259533DSGT
✅ Drop-In✓ In Stock
$0.55 / Unit
View Datasheet →TPS259534DSGR
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
TPS259535DSGR
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
TPS259533DSGT Specifications
| Manufacturer | Texas Instruments |
| Part Number | TPS259533DSGT |
| Function | Integrated eFuse / Hot-Swap Controller with OVP |
| Input Voltage Operating Range | 2.7 V to 18 V (TPS2595x5) |
| Input Voltage Absolute Maximum | 20 V |
| On-Resistance (RON) | 34 mΩ (typical) |
| Adjustable Current Limit Range | 0.5 A to 4 A |
| OVP Clamp Voltage | 13.7 V (TPS259533 variant) |
| OVP Response Time | 5 µs (typical) |
| Operating Temperature Range | -40 °C to +125 °C |
| Package Type | WSON-8 (DSG) 2x2 mm with exposed thermal pad |
| Pin Count | 8 |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Packaging | Tape and Reel |
TPS259533DSGT Pin Configuration
| Pin 1 | VIN — Input supply voltage to the eFuse |
| Pin 2 | VIN — Input supply voltage (tied to pin 1) |
| Pin 3 | PGND — Power ground / exposed thermal pad |
| Pin 4 | VOUT — Regulated output to downstream load |
| Pin 5 | VOUT — Regulated output (tied to pin 4) |
| Pin 6 | ILIM — Current-limit set resistor to ground |
| Pin 7 | EN/UVLO — Enable and undervoltage lockout input |
| Pin 8 | FLG — Open-drain fault indicator output |
Typical Applications
TPS259533DSGT is suitable for 7 applications: 12 V Industrial Hot-Swap Rail, USB-PD VBUS Source Protection, Fan and Brushless-DC Motor Supply, 5 V Hot-Swap for SSD Daughter Cards, PoE PD Port Protection, Industrial Sensor Hub Power, Test & Measurement Bench Power Rails.
12 V Industrial Hot-Swap Rail
The TPS259533DSGT's 18 V operating range and 13.7 V OVP clamp are purpose-built for 12 V industrial backplanes and PLC I/O rails. Its 34 mΩ RON drops only 136 mV at 4 A, leaving ample headroom for downstream regulators, and its 5 µs OVP response time clamps inductive transients from motor kickback faster than a TVS diode. The integrated thermal shutdown eliminates the external heatsink of a discrete hot-swap design, making it a fit for IP67 sealed enclosures.
Recommended
USB-PD VBUS Source Protection
Placed between a USB-PD controller and the Type-C VBUS pin, the TPS259533DSGT protects downstream load switches and battery chargers from 20 V PD profile overvoltages and hot-plug transients. The 34 mΩ RON keeps conduction loss under 0.15 W at 2 A continuous VBUS current, while the 5 µs OVP response reacts well within USB-PD timing budgets. The WSON-8 2x2 mm footprint fits directly under the Type-C connector on space-constrained phone and tablet boards.
Recommended
Fan and Brushless-DC Motor Supply
Brushless DC fans and small BLDC motors generate back-EMF spikes well beyond their nominal supply voltage, often 25-40 V on a 12 V rail. The TPS259533DSGT's 13.7 V OVP clamp isolates downstream 12 V regulators during commutation transients, and its 0.5-4 A adjustable current limit acts as an electronic stall-current limiter to protect against rotor lock. The internal thermal pad ties to the motor chassis ground, giving a low-impedance fault return path.
Recommended
5 V Hot-Swap for SSD Daughter Cards
On server and storage backplanes, M.2 and U.2 SSD daughter cards draw large inrush transients that can collapse the host 5 V rail. The TPS259533DSGT can be reconfigured to 5 V operation with a reduced ILIM setting, though designers more commonly use the lower-clamp TPS259531 variant for 5 V. The 34 mΩ RON keeps voltage droop under 200 mV at 4 A, allowing hot-insertion without violating PCIe power sequencing windows.
Recommended
PoE PD Port Protection
Power-over-Ethernet PD modules see 36-57 V on the input but feed downstream 12 V regulators; the TPS259533DSGT can be cascaded with a pre-regulator to protect the 12 V rail from PoE transition spikes. Its 5 µs OVP response time clears EFT and surge events that survive upstream TVS clamps. The WSON-8 footprint suits the compact form factor of single-port PoE PD modules integrated into IP cameras and wireless APs.
Recommended
Industrial Sensor Hub Power
Multi-sensor industrial hubs feed 12 V or 24 V back to distributed sensor nodes; the TPS259533DSGT sits between the trunk cable and the on-board DC-DC converter, providing resettable electronic fusing for each node. Its 0.5-4 A ILIM range matches the typical 1-2 A node consumption, and the 13.7 V OVP clamp tolerates 24 V truck-system transients. The exposed thermal pad bolts to the metal chassis for efficient fault-current heatsinking.
Recommended
Test & Measurement Bench Power Rails
Benchtop test equipment exposes multiple supply rails to operator mishandling - short circuits, voltage mis-wires, and hot-plug arcing. The TPS259533DSGT adds resettable protection on each bench rail at a BOM cost comparable to a discrete fuse plus TVS, and the OVP LED flag (if wired to the EN pin) gives the technician instant fault indication. The 0.5-4 A range covers most bench-rail current ratings.
Recommended
Recommended Products Summary
Engineering reference data for TPS259533DSGT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TPS259533DSGR | TPS259531DSGR | TPS259530DSGR | TPS259534DSGR | TPS259535DSGR |
|---|---|---|---|---|---|---|
| Package | WSON-8 (DSG) 2x2 mm | WSON-8 (DSG) 2x2 mm - same | WSON-8 (DSG) 2x2 mm - same | WSON-8 (DSG) 2x2 mm - same | WSON-8 (DSG) 2x2 mm - same | WSON-8 (DSG) 2x2 mm - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| OVP Clamp Voltage | 13.7 V | 13.7 V | 5.7 V | 3.8 V | 15 V | 16 V |
| On-Resistance (RON) | 34 mΩ | 34 mΩ | 34 mΩ | 34 mΩ | 34 mΩ | 34 mΩ |
| Current Limit Range | 0.5 A to 4 A | 0.5 A to 4 A | 0.5 A to 4 A | 0.5 A to 4 A | 0.5 A to 4 A | 0.5 A to 4 A |
| Input Voltage Range | 2.7 V to 18 V | 2.7 V to 18 V | 2.7 V to 18 V | 2.7 V to 18 V | 2.7 V to 18 V | 2.7 V to 18 V |
| OVP Response Time | 5 µs | 5 µs | 5 µs | 5 µs | 5 µs | 5 µs |
| Automotive Grade | No | No | No | No | No | No |
Key Differentiators
- Only TPS2595 family variant with 13.7 V OVP clamp (vs TPS259531DSGR (5.7 V clamp))
- Reverse-reel variant maintains identical BOM position (vs TPS259533DSGT (this part, standard reel))
- Lower-clamp variant enables true 5 V hot-swap without redesign (vs TPS259530DSGR (3.8 V clamp))
Design Notes
Estimated: at a sustained 4 A fault current the internal FET dissipates I² x RON = 4² x 0.034 = 0.54 W. The WSON-8 thermal pad has a low θJA but still requires at least 1 square inch of top-side copper pour to keep junction rise below 50 °C in still air. Without the pour, the part will thermal-foldback prematurely at high ambient.
Route VIN and VOUT as wide top-side copper pours with the thermal pad bridging them as a heat-spreader. Keep the ILIM resistor within 5 mm of pin 6 to prevent noise pickup on the high-impedance current-limit reference. According to the TI TPS2595xx datasheet, the exposed thermal pad must be soldered to PGND with at least 4 thermal vias to inner ground plane.
The '533' OVP clamp at 13.7 V is fixed and not externally programmable - if your rail sits below 12 V, choose '531' (5.7 V) instead. The EN/UVLO pin is dual-function: leaving it floating defaults to ON; pulling it below 0.4 V disables the FET. Do not exceed the 20 V absolute maximum on VIN even during load-dump.
Compliance Information
RoHS compliant per TI product page. Not AEC-Q100 qualified; choose TPS2595-Q1 family for automotive.
