TPS2371D - IEEE 802.3af PoE Power Interface Switch | TI
MPN: TPS2371D ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.1196 | $2.12 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
| 3,000 | $0 | $0.00 |
TPS2371D Overview
A power interface switch is the input-side protection and power-management circuit between an Ethernet cable and a PoE powered device. Its role is to establish the power path, protect the downstream system from unsuitable input conditions, and support the current and voltage limits associated with legacy IEEE 802.3af PoE systems. In system terms, it belongs to the power-management IC hierarchy and the broader PoE interface ecosystem.
The main verified characteristics are legacy IEEE 802.3af compatibility, operation in the PoE power domain, an 8-terminal surface-mount SOIC format, and a listed maximum operating temperature of 70 °C. The distributor record also identifies a 57 V-related comparison context, while the supplied Partstack result lists 48 V nominal voltage. These figures should be checked against the manufacturer datasheet before final design release because the search snippets do not provide the complete electrical characteristic table.
Typical uses include PoE-powered IP cameras, network access points, VoIP phones, industrial Ethernet endpoints, and other powered devices connected through an Ethernet infrastructure. The device is appropriate when the design uses the legacy 802.3af power interface concept and the existing board uses the TPS2371D pin arrangement. It is not a generic USB power switch or a complete PoE PD controller; neighboring devices with similar package names may serve different voltage, current, or protection functions.
For PCB implementation, place the switch close to the Ethernet input and power-entry components, maintain the datasheet-defined spacing for high-voltage copper, and provide the required input and output decoupling. Confirm absolute maximum ratings, operating voltage, current limit behavior, thermal conditions, and exposed-lead connections from the official TPS2371 documentation before applying it to a new design.
This page consolidates verified distributor availability, manufacturer positioning, package information, procurement data, and design cautions for engineers evaluating TPS2371D replacements or PoE front-end implementations.
Drop-in alternatives for TPS2371D — 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 TPS2371D (same form factor and footprint) — differing in Package, Operating Temperature Range, Product Type, Pin Count, PoE Compatibility.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
TPS2371PW
✅ Drop-In✓ In Stock
$1.12 / Unit
View Datasheet →TPS2371DR
✅ Drop-In✓ In Stock
$1.3718 / Unit
View Datasheet →TPS2371DG4
✅ Drop-In📋 Reference alternative (not in catalog)
TPS2092D
✅ Drop-In📋 Reference alternative (not in catalog)
TPS2061D
✅ Drop-In📋 Reference alternative (not in catalog)
TPS2378DDAR
✅ Drop-In✓ In Stock
$0.44 / Unit
View Datasheet →TPS2379DDAR
✅ Drop-In📋 Reference alternative (not in catalog)
TPS2371D Maximum Ratings & Electrical Characteristics
| Product Type | Power interface switch for Power over Ethernet powered devices |
| PoE Compatibility | Legacy IEEE 802.3af compatible |
| Nominal Voltage | 48 V |
| Terminal Count | 8 terminals |
| Terminal Pitch | 1.27 mm |
| Technology | CMOS |
| Maximum Operating Temperature | 70 °C |
| Package | 8-SOIC, 0.154 inch / 3.90 mm width |
| Mounting Type | Surface mount |
| Application Domain | Power over Ethernet powered devices |
| Interface Classification | Specialized power interface switch |
| Manufacturer | Texas Instruments |
| Product Series | TPS2371 |
| Orderable Part Number | TPS2371D |
| Input Power Context | PoE cable power input |
TPS2371D 8-soic, 0.154 inch / 3.90 mm width Pin Configuration Guide
Pin configuration for TPS2371D (8-soic, 0.154 inch / 3.90 mm width package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for TPS2371D.
Refer to the datasheet for full pin configuration.
Typical Applications
TPS2371D is suitable for 6 applications: Legacy PoE IP Camera, IEEE 802.3af Wireless Access Point, VoIP Phone Power Interface, Industrial Ethernet Endpoint, PoE-Powered Network Sensor, PoE Accessory and Power-Entry Module.
Legacy PoE IP Camera
The TPS2371D fits the power-entry stage of a legacy IEEE 802.3af IP camera when its input ratings and protection behavior match the camera’s PoE power budget. Position it between the Ethernet power path and the downstream protected supply so that the camera receives controlled power from the cable. The confirmed 8-SOIC package and legacy PoE positioning make it relevant for compact network-camera boards, but the designer must verify current limit, thermal margin, surge requirements, and complete pin behavior against the TI datasheet.
Recommended
IEEE 802.3af Wireless Access Point
TPS2371D is applicable to the power interface portion of a legacy 802.3af wireless access point when the PoE source and board power architecture are compatible. It can help isolate the Ethernet-fed power path before downstream regulation, provided the input range, current capability, and fault response satisfy the access point’s load. The verified data does not state the complete electrical limits, so engineers should compare the access point’s worst-case startup and steady-state power with the official TPS2371 documentation before layout.
Recommended
VoIP Phone Power Interface
A VoIP phone using legacy PoE can be evaluated with TPS2371D at the Ethernet power-entry interface. The device’s stated IEEE 802.3af compatibility targets the older powered-device environment commonly used for voice endpoints, while its 8-SOIC format supports conventional surface-mount assembly. The final choice depends on the phone’s input voltage, maximum load, startup behavior, and protection requirements. Use the manufacturer datasheet and the complete phone power budget to verify that the switch is not overloaded during boot or speaker operation.
Recommended
Industrial Ethernet Endpoint
TPS2371D may fit an industrial Ethernet endpoint that uses legacy 802.3af PoE and requires a dedicated power-interface switch. The verified 70 °C maximum operating temperature provides a useful initial constraint, but industrial deployment may require a wider environmental range, enhanced qualification, or additional surge protection. Designers should compare the endpoint’s cable-side voltage, load current, isolation architecture, and enclosure temperature with the manufacturer ratings. The device should not be selected solely because the product is described as PoE compatible.
Recommended
PoE-Powered Network Sensor
TPS2371D can serve as a candidate power interface for a low- or moderate-power Ethernet sensor node using legacy PoE. The device’s specialized interface role is appropriate where the cable supplies power but the sensor includes a separate regulated downstream rail. Confirm that the available cable power covers the sensor’s peak and startup demand, and verify the switch’s thermal dissipation at the maximum load. Because the supplied data omits current and thermal limits, those values must come from the official TPS2371 datasheet before schematic approval.
Recommended
PoE Accessory and Power-Entry Module
TPS2371D is suitable for evaluation in a dedicated PoE power-entry module that separates cable power from a downstream regulated load. Its 8-SOIC package can simplify inspection and rework in a small interface board, while the legacy 802.3af description helps identify the intended system class. The module designer must still account for cable-side transients, fault current, input capacitance, and thermal dissipation. Use the official datasheet for recommended external components and do not infer those values from generic PoE reference circuits.
Recommended
Recommended Products Summary
Engineering reference data for TPS2371D — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TPS2371PW | TPS2371DR | TPS2371DG4 | TPS2092D | TPS2061D |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Terminal Count | 8 | 8 | 8 | 8 | 8 | 8 |
| Primary Function | Power interface switch for PoE powered devices | TPS2371 family power interface | TPS2371 family power interface | TPS2371 family power interface | Low-voltage, high-current-limiting component | USB power switch |
Key Differentiators
- Purpose-built legacy PoE interface function (vs TPS2061D)
- PoE cable-power context (vs TPS2092D)
- Same-package family alternatives (vs TPS2371PW)
Design Notes
Treat the Ethernet cable-side power path as a high-voltage interface, not as a generic low-voltage logic rail. Before routing, verify the TPS2371D absolute maximum and recommended input ranges, startup current, current-limit behavior, and downstream power budget from the manufacturer datasheet. Confirm that the selected PoE source and cable classification can deliver the load during startup. The supplied search data provides 48 V nominal context but does not provide a complete operating-range table, so do not use that value as a substitute for the datasheet limits.
Place the TPS2371D and its associated protection and decoupling components close to the Ethernet power-entry nodes. Follow the manufacturer’s recommended copper paths and pinout rather than a generic SOIC-8 symbol. Preserve the required separation between cable-side and system-side conductors, and check creepage, clearance, surge-current return paths, and thermal copper using the applicable system safety requirements. The supplied data does not include a verified pin map or layout reference, so a schematic review against the TI datasheet is mandatory.
Do not assume that an 8-SOIC package or a TPS23xx family name proves replacement compatibility. TPS2092D is described as a low-voltage, high-current-limiting component, while TPS2061D is described as a 2.7 V to 5.5 V USB power switch. Confirm pin names, input ratings, current capability, fault response, thermal limits, and lifecycle status before substitution. The listed TPS2371PW, TPS2371DR, and TPS2371DG4 are family or ordering-code candidates, but their exact electrical and temperature details still require official-data verification.
Compliance Information
The supplied verified data does not provide RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations. The 70 °C maximum operating temperature is a technical specification, not proof of automotive or industrial qualification.
