TPS2371PWR - Legacy PoE Power Interface Switch | TI
MPN: TPS2371PWR ✗ End of Life| Qty | Unit Price | Extended |
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| 1 | $0 | $0.00 |
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| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
| 3,000 | $0 | $0.00 |
TPS2371PWR Overview
A power interface switch is an integrated semiconductor that sits between a PoE source and the powered equipment. It controls how power is applied to the downstream circuit, helping prevent excessive startup current, protecting source equipment, and defining the operating conditions seen by the load. In the broader power-management hierarchy, this device belongs to the PoE interface-switch and power-management IC category rather than a conventional voltage regulator.
The verified manufacturer information identifies the TPS2371 as a legacy IEEE 802.3af-compatible power interface switch for PoE PDs. The datasheet search result also states that IEEE 802.3af permits an inrush current of 400 mA for 50 ms, limiting the load capacitor to approximately 180 µF. The programmable inrush current limit removes that restriction and permits a larger capacitor with lower startup current.
The key design trade-off is between fast startup and controlled power admission. A lower programmed inrush limit can reduce stress on the PoE source and downstream components but may lengthen startup, while a higher limit can start a larger load more quickly but places greater transient demand on the source. The device is intended to simplify legacy PoE PD power-interface designs while preserving the external 8-TSSOP footprint.
Typical applications include legacy PoE powered devices, powered Ethernet endpoints, IP cameras, VoIP phones, access-point equipment, and other IEEE 802.3af-compatible PDs. The part should be selected only after checking the source's PoE classification, available power, startup timing, protection requirements, and downstream capacitance against the complete manufacturer datasheet.
For implementation, follow the manufacturer application guidance for input capacitance, current-limit programming, surge protection, layout, and exposed-pad or thermal requirements where applicable. Do not infer ratings, thresholds, or timing values from distributor descriptions alone; verify them in the official TPS2371 datasheet before releasing a production design.
This page consolidates verified manufacturer and distributor descriptions, separates documented facts from unavailable parameters, and provides engineering guidance for comparing this legacy PoE interface switch with possible replacements.
Drop-in alternatives for TPS2371PWR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with TPS2371PWR (same form factor and footprint) — differing in Package, Product Type, Inrush Current Control, Operating Temperature Range.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
TPS2371PWRG4
✅ Drop-In📋 Reference alternative (not in catalog)
TPS2371D
✅ Drop-In✓ In Stock
Contact for price
View Datasheet →TPS2371PW
✅ Drop-In✓ In Stock
$1.12 / Unit
View Datasheet →TPS2371PWR Maximum Ratings & Electrical Characteristics
| Product Type | Power interface switch for Power over Ethernet powered devices |
| PoE Compatibility | Legacy IEEE 802.3af compatible |
| Package | 8-TSSOP, 0.173 inch / 4.40 mm width |
| Pin Count | 8 pins |
| Input Inrush Limit | 400 mA for 50 ms according to IEEE 802.3af specification |
| Maximum Load Capacitor Under IEEE 802.3af Limit | Approximately 180 µF |
| Inrush Current Control | Programmable |
| Operating Temperature Range | 0°C to 70°C |
| Mounting Type | Surface mount |
| Manufacturer | Texas Instruments |
| Lifecycle Classification | Legacy |
| Application Category | Power over Ethernet powered devices |
| Interface Type | PoE power interface |
TPS2371PWR 8-tssop, 0.173 inch / 4.40 mm width Pin Configuration Guide
Pin configuration for TPS2371PWR (8-tssop, 0.173 inch / 4.40 mm width package). This power device features gate, drain, and source terminals. For non-polarized packages, refer to the manufacturer datasheet for exact pin 1 orientation and footprint details. Common applications include power supply design, motor driving, and load switching.
No detailed pinout data available for TPS2371PWR.
Refer to the datasheet for full pin configuration.
Typical Applications
TPS2371PWR is suitable for 6 applications: Legacy PoE IP Camera, VoIP Phone Power Interface, Powered Wireless Access Point, Industrial PoE Sensor Gateway, Legacy PoE Network Interface, Low-Power PoE Endpoint.
Legacy PoE IP Camera
TPS2371PWR is suitable for a legacy IEEE 802.3af powered IP camera when the system needs controlled startup of its local input capacitance. The switch's programmable inrush function is important because a camera can contain bulk capacitance, regulators, filters, and power-hold-up components that would otherwise create a large startup transient. Using a lower programmed inrush level can reduce stress on the PoE source, while a higher level can shorten startup when the power budget permits. The verified record confirms legacy PoE compatibility and programmable limiting, but it does not provide the complete current-limit range, input voltage range, or timing values. Validate the camera's capacitor size, power budget, and startup sequence against the official datasheet.
Recommended
VoIP Phone Power Interface
TPS2371PWR can be considered in a legacy PoE VoIP phone or access endpoint where the powered device receives power through an Ethernet connection. The programmable inrush feature helps separate the initial charging event from the normal operating load, allowing the designer to choose a startup profile that does not excessively burden the source. This is useful in designs with local decoupling and regulator input capacitors. The verified data identifies an 8-TSSOP package and legacy IEEE 802.3af compatibility, but it does not specify telephone power classes, startup time, or maximum operating current. Those values must be obtained from the manufacturer datasheet before selecting the device for a production phone.
Recommended
Powered Wireless Access Point
TPS2371PWR may fit a legacy PoE wireless access point that needs controlled admission of power before its RF, digital, and memory circuits start. The switch's inrush-current programming helps the designer manage a load with multiple local capacitors and regulators, reducing the chance that startup energy will trip or stress the upstream PoE source. A lower limit may extend startup, while a higher limit may improve boot time; the correct setting depends on the source capability and load capacitance. The verified data confirms legacy IEEE 802.3af compatibility and programmable inrush behavior but does not provide the device's current-limit range, input voltage limits, or thermal data.
Recommended
Industrial PoE Sensor Gateway
TPS2371PWR can be evaluated in a legacy PoE sensor gateway when the powered equipment includes a large input capacitor or multiple supply rails. The switch provides a controlled path for applying power rather than allowing an uncontrolled inrush event. That benefit is especially relevant when the gateway includes wireless, analog, or digital subsystems that become active only after power is stable. However, the verified record does not establish industrial temperature qualification, input-voltage tolerance, surge protection, or AEC-Q100 status. The gateway design should therefore use the device only after confirming the full electrical envelope and environmental requirements in the official TPS2371 documentation.
Recommended
Legacy PoE Network Interface
TPS2371PWR is applicable to a legacy PoE network interface that needs a defined power-on sequence between the Ethernet source and the local circuitry. Programmable inrush current helps coordinate the charging of input capacitance with the source's allowed startup behavior. The part's 8-TSSOP package is useful for compact embedded designs, but board layout must follow the manufacturer recommendations for high-current paths, bypass capacitors, protection, and signal return. The verified data does not provide a complete pinout or all timing thresholds, so engineers should not assign pins or finalize startup timing from the distributor snippets alone.
Recommended
Low-Power PoE Endpoint
TPS2371PWR can be considered for a low-power PoE endpoint where controlled startup is more important than adding a modern high-integration power converter. The device separates the source-admission function from the downstream regulator, allowing the powered circuit to use its own voltage regulation while the interface switch manages the initial current event. This can simplify power sequencing and reduce the risk of source overload. The verified material does not provide efficiency, quiescent current, maximum power, or thermal specifications, so the endpoint's average and peak power must be checked against the complete manufacturer datasheet and the selected PoE power class.
Recommended
Recommended Products Summary
Engineering reference data for TPS2371PWR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TPS2371PWRG4 | TPS2371D | TPS2371PW |
|---|---|---|---|---|
| Product Type | Legacy IEEE 802.3af-compatible PoE PD power interface switch | TPS2371 family power interface switch; similar functional characteristics reported | Power interface switch; comparison result describes consistent characteristics | TPS2371 family variant; consistent characteristics reported |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 8-TSSOP, 0.173 inch / 4.40 mm width | 8-TSSOP reported by comparison context | SOIC-8 reported by comparison result; physical footprint requires verification | 8-TSSOP family package |
Key Differentiators
- Legacy PoE positioning (vs TPS23753APW)
- Programmable startup behavior (vs TPS2350PWR)
- Documented reference limit (vs TPS2371D)
- Package selection requires validation (vs TPS2371D)
Design Notes
Calculate the startup charge requirement from the downstream capacitance and the selected inrush limit before laying out the PoE input stage. The supplied datasheet snippet identifies a 400 mA, 50 ms IEEE 802.3af reference and an approximately 180 µF resulting capacitor limit, but the TPS2371's programmable range is not included in the verified record. Confirm the exact threshold, tolerance, and startup timing in the official datasheet. Then verify that the programmed profile does not cause the source or local regulator to exceed its limits.
Place the input bypass and protection components directly along the PoE power-entry path and keep the high-current return path short and wide. The verified data does not include the complete pinout or recommended land pattern, so do not infer pad assignments from the package name. Use the manufacturer package drawing and application guidance to determine capacitor placement, surge-current routing, and exposed thermal features. Incorrect high-current placement can increase parasitic inductance and undermine the controlled startup behavior.
Do not treat a distributor search result as proof of drop-in compatibility. The cross-reference material names TPS23753APW and TPS2350PWR for comparison, but it does not establish identical pin functions, input limits, current-limit ranges, startup timing, or protection behavior. Before substituting either part, compare the official datasheets and verify the PCB footprint. Also check the device's legacy status and obtain a current lifecycle statement before committing new production designs.
Compliance Information
The supplied verified data does not explicitly state RoHS, REACH, lead-free, halogen-free, conflict-minerals, or AEC-Q100 status. AEC-Q100 is marked not_applicable because no automotive qualification claim appears in the verified data, not because the product is confirmed qualified or unqualified for every automotive context.
