TPS2371DR - IEEE 802.3af PoE PD Interface | Texas Instruments
MPN: TPS2371DR ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.3718 | $1.37 |
| 10 | $1.3718 | $13.72 |
| 100 | $1.3718 | $137.18 |
| 500 | $1.3718 | $685.90 |
| 1,000 | $1.3718 | $1,371.80 |
TPS2371DR Overview
A Power over Ethernet powered-device interface is the circuit that receives power through an Ethernet cable, identifies the attached load, negotiates its power class, and safely connects that power to the local system. In the power hierarchy, a PD interface sits between the PoE supply and the powered equipment’s DC/DC converter or load. It prevents an unsupported or improperly connected network port from receiving unsafe power.
The TPS2371DR’s principal engineering benefits are its IEEE 802.3af compatibility, integrated protection, and autonomous interface operation. The device provides both detection and classification signatures, eliminating separate handshake circuitry in many conventional PoE PD designs. Its internal hot-swap MOSFET helps control connection transients, while the programmable inrush limit reduces the stress applied to downstream capacitance and power circuitry.
The chip also uses precision UVLO thresholds to distinguish valid operating conditions and includes a defined 20-ms off-time delay after UVLO. That delay provides controlled recovery before the interface attempts another valid operating state. As an 8-SOIC surface-mount device, the TPS2371DR supports compact PoE endpoint designs without requiring a large connector-side or board-edge package.
Typical uses include IP cameras, VoIP phones, wireless access points, network switches, powered network adapters, and other low- to moderate-power Ethernet endpoints. These products can use the TPS2371DR when IEEE 802.3af behavior and a conventional eight-pin PoE PD interface are required. For higher-power or newer PoE standards, designers should verify the exact PSE, PD, class, voltage, and protection requirements before selecting this legacy-compatible device.
Layout should keep the Ethernet input and power-path nodes physically separated from sensitive downstream electronics, and it should provide appropriate copper area for thermal dissipation during sustained power transfer. Component values must follow the manufacturer’s reference design because the programmable inrush and protection network determine startup behavior. The interface also requires correct grounding and protection placement to avoid allowing transient current into sensitive ports.
This page consolidates the verified manufacturer, distributor, pricing, lifecycle, and replacement information for TPS2371DR, while clearly separating confirmed specifications from unavailable electrical details. It also provides application guidance and drop-in alternatives where the available cross-reference evidence supports pin and package compatibility.
Drop-in alternatives for TPS2371DR — 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 TPS2371DR (same form factor and footprint) — differing in Package, PoE Compatibility.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
TPS2371D
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View Datasheet →TPS2371DR Specifications
| Product Type | Power interface switch for Power over Ethernet powered devices |
| PoE Compatibility | IEEE 802.3af and legacy compatible |
| Detection Signature | Provided |
| Classification Signature | Class 0-4 |
| UVLO Off-Time Delay | 20 ms |
| Inrush Current Limit | Programmable |
| Internal MOSFET Resistance | 0.3 ohm |
| Package | 8-SOIC |
| Pin Count | 8 pins |
| Mounting Type | Surface mount |
| Operating Temperature Range | 0 C to +70 C |
| Power Interface Functions | Hot swap and power distribution |
| PD Application | Powered device |
TPS2371DR 8-soic Pin Configuration Guide
Pin configuration for TPS2371DR (8-soic 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 TPS2371DR.
Refer to the datasheet for full pin configuration.
Typical Applications
TPS2371DR is suitable for 6 applications: IEEE 802.3af IP Camera, VoIP Network Phone, Wireless Access Point, PoE Network Adapter, Powered Network Switch, Industrial Ethernet Endpoint.
IEEE 802.3af IP Camera
The TPS2371DR fits an IEEE 802.3af network-camera power interface because it supplies PD detection, class 0-4 classification, programmable inrush control, and hot-swap power distribution in one 8-SOIC device. Place it at the Ethernet power-entry section ahead of the camera’s local DC/DC converter. Its 20-ms UVLO off-time provides a defined recovery interval, while the internal 0.3-ohm MOSFET helps isolate the powered rail during connection events. The camera’s actual power budget, isolation strategy, Ethernet magnetics, and downstream converter must still be checked against IEEE 802.3af and the manufacturer reference design.
Recommended
VoIP Network Phone
The TPS2371DR supports the power-entry stage of an IEEE 802.3af VoIP phone by performing the required powered-device detection and classification handshake before enabling its power path. Its detection signature and class 0-4 classification signature reduce the need for separate interface components. Programmable inrush limiting gives the designer control over the current applied to the phone’s downstream supply capacitance, and hot-swap behavior protects the interface during cable or equipment transitions. Final compatibility depends on the phone’s requested class, local converter startup behavior, cable installation, and the applicable PoE system budget.
Recommended
Wireless Access Point
The TPS2371DR is appropriate for an IEEE 802.3af wireless access point that receives classified DC power through Ethernet. The device provides the PD detection and class 0-4 classification functions required at the interface, then controls connection through its hot-swap power path. Its programmable inrush current limit helps prevent abrupt startup current from stressing the access point’s downstream converter or bulk capacitance. Because radio and processor rails may also contain fast-switching circuitry, the PoE front end should be laid out separately from sensitive RF and signal paths and validated for conducted emissions and immunity alongside the complete access point.
Recommended
PoE Network Adapter
The TPS2371DR can form the core of a compact PoE network adapter for an Ethernet endpoint that previously lacked remote power. Its 8-SOIC package simplifies integration into adapter hardware, while detection and classification signatures allow the adapter to communicate its expected powered-device behavior. The internal 0.3-ohm MOSFET and programmable inrush limit help manage the transition onto the downstream rail. Designers must set the inrush network and input protection according to the manufacturer guidance, account for connector and cable losses, and ensure the adapter does not request more class power than the PSE and local converter can support.
Recommended
Powered Network Switch
The TPS2371DR is suitable for the powered-device interface of an IEEE 802.3af endpoint within a managed or unmanaged network switch. The component identifies the attached PD and supplies its classification signature before the hot-swap interface connects power. This separation helps isolate the port during startup and unexpected loss of PoE. In a multi-port switch, each PD port needs its own interface and correctly scaled protection and layout; the TPS2371DR should not be treated as a simultaneous multiport controller. Validate the aggregate PSE power budget, port current limits, thermal performance, and downstream conversion efficiency across all operating classes.
Recommended
Industrial Ethernet Endpoint
The TPS2371DR can support a legacy-compatible industrial Ethernet endpoint that receives standard IEEE 802.3af power over a copper cable. Its detection, classification, precision UVLO, and programmable inrush functions provide the fundamental PD interface, while the 0 C to +70 C listed operating range suits temperature-controlled industrial equipment when all other system components also meet the environmental requirement. The input network and layout must be selected for the installation’s surge,ESD, cable-length, and isolation conditions. Because the part is identified as legacy-compatible, verify functional safety, cybersecurity, lifecycle, and environmental needs before new deployment.
Recommended
Recommended Products Summary
Engineering reference data for TPS2371DR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TPS2371D |
|---|---|---|
| Brand | Texas Instruments | Texas Instruments |
| Package | SOIC-8 | SOIC-8 |
| Pin Compatibility | 8-pin powered-device interface | Verified consistent terminals and package |
| PoE Compatibility | Legacy/IEEE 802.3af compatible | Consistent principal performance and functional characteristics |
Key Differentiators
- Verified pin-compatible maintenance option (vs TPS2371D)
- Integrated IEEE 802.3af PD handshake functions (vs TPS2371D)
- Controlled recovery and connection behavior (vs TPS2371D)
Design Notes
Follow the manufacturer’s input and inrush-current network rather than selecting values solely from the load’s steady-state current. The verified TPS2371DR features include programmable inrush limiting and an internal 0.3-ohm MOSFET. Check the downstream converter’s soft-start behavior, input capacitance, cable loss, PSE class limit, fault-current response, and startup waveform together. This prevents a valid nominal power class from producing an excessive connection transient.
Place the PoE input protection and hot-swap current path for minimum loop area, and keep the associated high-voltage copper away from Ethernet magnetics, low-level analog sections, and sensitive downstream rails. Route surge and ESD current through the designed protection path into the intended reference or protection network. Do not improvise isolation or protection values from the 0.3-ohm MOSFET resistance; use the TPS2371 application guidance for the complete board.
Verify dissipation from the internal hot-switch path using the maximum sustained port current, internal on-resistance, copper area, ambient temperature, and board construction. The verified value is 0.3 ohm, so resistive dissipation grows with the square of current. For a design estimate, use P = I²R only after confirming that 0.3 ohm applies to the operating condition; then compare calculated temperature rise with the device limit from the manufacturer documentation. Increase copper area if prototype measurements indicate excessive rise.
Do not treat TPS2377 as a strict drop-in replacement without an official pin-compatibility statement. The verified Jotrin result names TPS2377 as the replacement for TPS2371DR, but the supplied data does not show an identical pinout or parameter set. Likewise, confirm IEEE 802.3af classification limits, the requested PD power, and the PSE budget before layout release. Legacy compatibility does not imply support for newer high-power PoE standards.
Compliance Information
The supplied verified snippets do not provide explicit compliance declarations for RoHS, REACH, AEC-Q100, lead-free status, halogen-free status, or conflict-minerals compliance. No compliance status is assumed.
