TPS2370PWR - IEEE 802.3af PoE PD Interface Switch | Texas Instruments
N.º de pieza: TPS2370PWR ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $2.85 | $2,85 |
| 10 | $2.55 | $25,50 |
| 100 | $2.1 | $210,00 |
| 500 | $1.78 | $890,00 |
| 1.000 | $1.5 | $1.500,00 |
TPS2370PWR Descripción general
A PoE Powered Device Controller is a specialized interface IC that sits between the Power Sourcing Equipment (PSE) on the Ethernet switch and the application load. It performs the signature resistance, power classification (Class 0-4) and inrush-limited hot-swap turn-on mandated by IEEE 802.3af, then hands a regulated bulk rail to a downstream DC-DC converter. Within the broader Power-over-Ethernet taxonomy, the TPS2370PWR belongs to the PD controller category, which complements PSE controllers and DC-DC converters to form a complete PoE end-to-end solution.
Key features include 0.3-ohm internal FET on-resistance for low conduction loss, 100 V maximum input voltage on VPD for surge margin, integrated IEEE 802.3af detection signature (24.9 kohm) and classification current sourcing, programmable inrush current limiting via an external gate capacitor, and a complementary open-drain PG (power-good) output for sequencing the downstream converter. Above 20 V input the classification current is shut off to reduce internal dissipation, and an internal undervoltage lockout prevents turn-on below the 802.3af minimum operate voltage.
The architecture combines a precision bandgap reference, current-mode signature generation and a gated low-side MOSFET driver. By driving only the return-side FET, the TPS2370PWR allows the upstream PSE to maintain the PoE pair-to-pair voltage regardless of PD load transients. The 8-pin TSSOP body keeps the thermal path short, and the device is rated for the industrial -40C to +85C operating range required for outdoor and industrial Power-over-Ethernet endpoints.
Typical applications include VoIP telephones, wireless LAN access points, IP security cameras, IoT gateways and industrial sensors that draw their power from the Ethernet cable rather than a separate wall adapter. Placing the TPS2370PWR upstream of a wide-input DC-DC converter is the canonical architecture for any 802.3af-compliant PD.
When designing with this part, ensure the inrush gate capacitor is sized for the downstream bulk capacitance to keep inrush current within the 802.3af limit, and verify the transformer bridge is 802.3af compliant with the required center-tap connection. A TVS diode on VPD is strongly recommended for surge robustness above the 100 V abs-max.
This page synthesizes distributor pricing, same-brand and cross-brand drop-in alternatives, and practical PoE design notes not found on a single manufacturer page.
Alternativas directas para TPS2370PWR — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con TPS2370PWR (mismo factor de forma y huella) — difiere en Operating Temperature Range, Package, Function, Inrush Current Limiting, Standards Compliance.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
TPS2370PWRG4
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
TPS2370PW
✅ Sustitución directa ⚠️ Especificaciones sin verificar✓ En stock
$1.49 / unidad
Ver hoja de datos →TPS2370PWG4
✅ Sustitución directa✓ En stock
$1.52 / unidad
Ver hoja de datos →TPS2376DDAR
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
TPS23753APWR
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
TPS2370PWR Valores máximos y características eléctricas
| Función | IEEE 802.3af PoE Powered Device (PD) Interface Switch |
| Standards Compliance | IEEE 802.3af |
| Number of Channels | 1 |
| Encapsulado | 8-pin TSSOP (PW) |
| Maximum Input Voltage (VPD) | 100 V |
| Internal FET Rds(on) | 0.3 ohm |
| Detection Signature Resistance | 24.9 kohm (typical) |
| Classification | Class 0 to Class 4 supported |
| Classification Current Shutoff | Above 20 V input |
| Inrush Current Limiting | Programmable via external gate capacitor |
| Salida Power Good | Open-drain, complementary |
| Rango de temperatura de funcionamiento | -40C to +85C |
| Tipo de montaje | Surface Mount |
| Estado RoHS | Compliant |
Configuración de pines de TPS2370PWR
| Pin 1 | GND — Analog ground; tie to system GND plane |
| Pin 2 | VPD — PoE input voltage from Ethernet bridge (up to 100 V abs max) |
| Pin 3 | RTN — Return-side output of internal pass FET |
| Pin 4 | APD — Auxiliary power detect / auxiliary power input |
| Pin 5 | PG — Power good open-drain output (active low) |
| Pin 6 | GATE — Gate driver for downstream pass element and inrush programming |
| Pin 7 | CLASS — Class programming pin (external resistor to APD sets Class 0-4) |
| Pin 8 | VSS — Substrate/internal ground |
Aplicaciones típicas
TPS2370PWR es adecuado para 6 aplicacións: IP Security Cameras, VoIP Telephones, Wireless Access Points, Industrial IoT Gateways, Smart Building Sensors, PoE-Powered LED Lighting.
IP Security Cameras
Why the TPS2370PWR fits IP cameras: IEEE 802.3af compliance delivers up to 12.95 W over a single Cat-5 cable, which is sufficient for camera + IR illuminator + lens heater loads. The internal 0.3 ohm pass-FET keeps conduction loss under 50 mW at typical 200 mA load, leaving more budget for the imager and ISP. How it is used: the part sits between the Ethernet RJ-45 magnetics and the downstream DC-DC, presenting the 24.9 kohm detection signature and Class-2/3 current during PSE handshake. A TVS on VPD clamps outdoor surge events, and the inrush gate capacitor is sized for the bulk capacitance on the DC-DC input to stay within the 802.3af inrush limit during hot-plug events.
Recomendado
VoIP Telephones
Why the TPS2370PWR fits VoIP phones: a single 802.3af PD interface replaces the wall adapter, simplifying deployment in office wall-plate locations without AC outlets. The 0.3 ohm internal FET and 100 V abs-max VPD rating allow safe operation on cable events while keeping the bill of materials minimal. How it is used: the TPS2370PWR negotiates detection and classification, then enables the downstream isolated DC-DC that powers the DSP and handset audio codec. A PG (power-good) output feeds the host MCU so the software can wait for stable bulk power before booting, preventing boot glitches during PoE mid-span events or switch reboot transients.
Recomendado
Wireless Access Points
Why the TPS2370PWR fits wireless APs: powering radios and baseband from the Ethernet cable eliminates separate AC adapters and lets installers mount the AP at optimal antenna height. IEEE 802.3af with up to 12.95 W is sufficient for dual-radio 2.4 GHz/5 GHz APs in office deployments. How it is used: the TPS2370PWR is upstream of a wide-input 5 V/3 A DC-DC; its PG output enables the downstream regulator only after 802.3af handshake completes. Classification at Class 3 reserves the full 12.95 W budget from the PSE so the AP can transmit at full RF power without under-voltage events during peak traffic.
Recomendado
Industrial IoT Gateways
Why the TPS2370PWR fits industrial IoT: the -40C to +85C operating range supports factory-floor and outdoor enclosures, and the 100 V abs-max VPD tolerates long cable runs with elevated common-mode voltage. Combining PoE input with the part's small 8-pin TSSOP keeps the BOM small for space-constrained DIN-rail or panel-mount gateways. How it is used: the TPS2370PWR feeds an isolated or non-isolated DC-DC that powers the gateway MCU and cellular/Ethernet uplinks. An external MOV or TVS on VPD handles plant-side surge events common in industrial environments, while the CLASS pin allows the gateway to be set to Class 1 to advertise reduced power draw.
Recomendado
Smart Building Sensors
Why the TPS2370PWR fits building sensors: low-power PoE PD operation lets designers combine power and data over a single cable, simplifying install in ceiling and wall locations without AC drops. The part's Class 0-4 classification flexibility is useful for sensors that need different power budgets at different sites. How it is used: the TPS2370PWR is placed in the wall or ceiling plate, presenting the 24.9 kohm signature and class current during PSE handshake, then enabling a small 5 V or 3.3 V DC-DC that powers the sensor MCU and wireless mesh radio. The PG output can be wired to the MCU wake pin so radios only transmit after PoE bulk power is stable.
Recomendado
PoE-Powered LED Lighting
Why the TPS2370PWR fits PoE lighting: 802.3af classification at 12.95 W is enough to power a high-brightness LED fixture with proper driver electronics, eliminating the need for high-voltage AC wiring at the luminaire. The internal pass-FET replaces a discrete hot-swap circuit, shrinking BOM and improving surge robustness. How it is used: the TPS2370PWR feeds a downstream constant-current LED driver, with PG signaling the host controller that PoE negotiation is complete before enabling dimmable lighting. An optional 0-10 V or DALI control interface can be added to drive the LED brightness from the building management system.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para TPS2370PWR — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | TPS2370PWRG4 | TPS2370PW | TPS2370PWG4 | TPS2376DDAR | TPS23753APWR |
|---|---|---|---|---|---|---|
| Package | TSSOP-8 (PW) | TSSOP-8 (PW) - same | TSSOP-8 (PW) - same | TSSOP-8 (PW) - same | SO-PowerPAD-8 (DDA) | TSSOP-20 (PW) - larger |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| IEEE Standard | 802.3af (Type 1) | 802.3af (Type 1) | 802.3af (Type 1) | 802.3af (Type 1) | 802.3at (Type 2) | 802.3af with integrated DC-DC |
| Internal FET Rds(on) | 0.3 ohm | 0.3 ohm | 0.3 ohm | 0.3 ohm | 0.3 ohm | 0.3 ohm |
| Integrated DC-DC Controller | No | No | No | No | No | Yes |
| Detection Signature | 24.9 kohm | 24.9 kohm | 24.9 kohm | 24.9 kohm | 24.9 kohm | 24.9 kohm |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
Diferenciadores clave
- Fully integrated 802.3af PD interface with internal pass-FET (frente a TPS23753APWR (TSSOP-20))
- Lower BOM count than DC-DC-integrated alternatives (frente a TPS23753APWR)
- Higher package density than SO-PowerPAD competitors (frente a TPS2376DDAR (DDA-8))
Notas de diseño
At 802.3af maximum of 350 mA continuous through the internal 0.3 ohm pass-FET, dissipation is approximately 37 mW, well within the TSSOP-8 thermal limit.Estimated: 0.35 A x 0.35 A x 0.3 ohm = 0.0368 W. For higher-power PoE+ designs above 600 mA where the internal FET is the bottleneck, choose TPS2376DDAR instead.
Place the TPS2370PWR as close as possible to the Ethernet bridge/transformer center-tap to keep the VPD trace short and minimize the loop area for surge and ESD events. The CLASS resistor must be referenced to the APD pin, not to GND, to ensure accurate 802.3af classification. Use a 0.1 uF bypass capacitor as close to the VPD pin as practical, in parallel with a TVS diode rated for cable-discharge transients (e.g. SMAJ58CA or similar).
Do not bypass the inrush gate capacitor on the GATE pin - it programs the maximum inrush current at hot-plug, and omitting it allows uncontrolled charging of the downstream bulk capacitance that violates the 802.3af inrush limit and can trip the PSE. Ensure the auxiliary power detect (APD) voltage divider is correctly sized if used with a wall adapter; wrong levels cause the TPS2370PWR to incorrectly interpret the power source. Avoid pulling VPD above 100 V transiently even during surge events.
Keep the GND and VSS planes solid and tied together at a single star point near the TPS2370PWR, with the high-current return path returning directly to the RTN pin to avoid ground bounce in detection classification. The PG trace can be noisy in noisy PoE systems; route it away from VPD and add a small RC filter if the downstream converter shows spurious reset events.
Información de cumplimiento
RoHS3 compliant per DiGi Electronics distributor listing. Industrial operating temperature -40C to +85C only; not AEC-Q100 automotive qualified - choose TPS2370-Q1 variants for automotive PoE.
