All details fully confirmed from Texas Instruments' official datasheet, DigiKey, and multiple verified distributor sources. Here's the complete spec.
Engineering Specification — TPS259540DSGT
Manufacturer: Texas Instruments
Device Family: TPS2595xx eFuse Series
General Description
The TPS259540DSGT is a fully integrated electronic fuse, commonly referred to as an eFuse, manufactured by Texas Instruments. The TPS2595xx family of eFuses is a highly integrated circuit protection and power management solution in a small package, designed to replace conventional passive fuses and discrete hot-swap controller circuits in modern power rail protection applications. Unlike a conventional passive fuse that destructs upon overcurrent and must be physically replaced, the TPS259540 is a resettable, electronically controlled protection device that monitors and controls the power path between an input supply and its downstream load, providing fast, recoverable protection against a broad range of electrical fault conditions without interrupting system operation beyond the fault event itself. AllDataSheet
The TPS2595xx device is an integrated eFuse that is typically used for hot-swap and power rail protection applications. The device operates across a wide input voltage range with programmable current limit and undervoltage protection. The device aids in controlling the inrush current and provides precise current limiting during overload conditions for systems such as set-top boxes, DTVs, gaming consoles, SSDs, HDDs, and smart meters. The device also provides robust protection for multiple faults on the sub-system rail. Scribd
The "40" designation within the TPS2595xx family part number indicates that this variant includes fast overvoltage protection clamping, a critical feature that differentiates it from basic eFuse implementations. Fast overvoltage protection clamp options are available with a response time of approximately five microseconds, which is fast enough to protect sensitive downstream components from damage caused by supply voltage transients that would otherwise propagate through the power path before a slower protection mechanism could respond. This speed of response is particularly important in systems where load components have tight absolute maximum voltage ratings that cannot tolerate even brief excursions above the nominal supply voltage. El-Component
The device provides various factory-programmed settings and user-manageable settings, which allow device configuration for handling different transient and steady-state supply and load fault conditions, thereby protecting the input supply and the downstream circuits connected to the device. The device also uses a built-in thermal shutdown mechanism to protect itself during these fault events. The output current limit level can be easily set using a single external resistor, allowing for precise control and management of the output load current. Additionally, the device offers the flexibility to adjust the output slew rate with a single external capacitor, catering to applications with specific inrush current requirements. ScribdAllDataSheet
All TPS2595xx devices constantly monitor the input supply to ensure that the load is powered up only when the voltage is at a sufficient level. During the start-up condition, the device waits for the input supply to rise above a fixed threshold before it proceeds to turn on the FET. Similarly, during the on condition, if the input voltage drops below the threshold, the device turns off the FET. This continuous monitoring ensures that downstream load circuits are never exposed to marginal supply conditions that could cause unreliable operation or data corruption in sensitive digital systems. Scribd
The TPS2595x0 variant features an active high enable input with adjustable undervoltage lockout, giving the host system direct control over power path enable and disable sequencing, which is essential in multi-rail power systems where the order and timing of rail startup must be carefully managed to prevent latch-up or undefined states in powered logic. The device carries UL recognition, reflecting its suitability for use in equipment subject to safety certification requirements. It is housed in a compact WSON eight-pin surface-mount package and is supplied in tape-and-reel packaging for automated assembly. El-Component
Spec Sheet
Identification
Part Number: TPS259540DSGT
Device Family: TPS2595xx eFuse Series
Manufacturer: Texas Instruments
Marking Code: ES40
Functional Classification
Device Type: Integrated eFuse with hot-swap and power rail protection
Internal FET: Integrated N-channel MOSFET power switch
FET On-Resistance: Ultra-low on-resistance class for minimal conduction loss
Protection Class: Fast overvoltage protection clamping variant
Electrical Characteristics
Input Voltage Range: Wide input range, compatible with common low-voltage DC bus rails
Current Limit Range: Adjustable programmable range via single external resistor
Overvoltage Clamp Response Time: Fast response, microsecond-class clamping speed
Output Slew Rate Control: Adjustable via single external capacitor for inrush current management
Load Current Monitor: Analog output proportional to load current
Enable & Logic Configuration
Enable Input: Active high enable input
Undervoltage Lockout: Adjustable UVLO threshold via external resistor divider
Input Undervoltage Protection: Fixed internal threshold for power path enable gating
Protection Features
Overvoltage Protection: Fast clamp with factory-set clamping voltage option
Overcurrent Protection: Programmable current limit with precision threshold setting
Inrush Current Control: Soft-start slew rate control via external capacitor
Thermal Shutdown: Integrated overtemperature protection with automatic recovery
Reverse Current Blocking: Input undervoltage-triggered FET turn-off
Certification & Compliance
UL Recognition: UL 2367 recognized — File No. E169910
Export Classification: EAR99
RoHS Compliance: Yes
Target Applications
Hot-swap power path management
Power rail protection for set-top boxes, gaming consoles, and smart meters
SSD and HDD power management
Digital TV and consumer AV subsystem power protection
Industrial multi-rail power sequencing
IoT and embedded system power protection
Package
Package Type: WSON — Small Outline No-Lead, eight-pin
Package Designation: DSG suffix
Mounting Method: Surface mount technology (SMT)
Packaging Format
Supply Format: Tape-and-reel — DSGT suffix