My Inquiry
My Account
Texas Instruments TPS2375DR
- Part No.:
- TPS2375DR
- Manufacturer:
- Texas Instruments
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS2375DR.pdf
- Description:
- IC POE CNTRL 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:5,438
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
TPS2375DR from Texas Instruments is an IEEE 802.3af-compliant Powered Device (PD) controller IC for Power over Ethernet applications. It integrates a 0.58-Ω, 100-V low-side MOSFET switch, fixed 450-mA operational current limit, programmable inrush current control via ILIM pin, open-drain power-good (PG) output, and 15-kV system-level ESD protection. It operates across –40°C to 85°C and supports VoIP phones, WLAN access points, and security cameras.
For engineers reviewing the TPS2375DR datasheet, TPS2375DR pinout, TPS2375DR application, or TPS2375DR equivalent, this page delivers verified technical context, exact pin functions, real-world PoE startup behavior, confirmed alternative controllers with documented functional differences, and supply-chain support for industrial PoE designs requiring stable component sourcing.
Technical Context
The TPS2375DR implements full IEEE 802.3af detection (2.7–10.1 V), classification (13–21 V), and powered operation (≥30.5 V UVLO falling threshold) with hysteresis. Its internal comparators monitor VDD against fixed UVLO thresholds (30.5 V turn-off / 39.3 V turn-on), while the DET pin sinks current through R(DET) = 24.9 kΩ during detection and disconnects above 11.3 V to conserve power.
Classification is set by external R(CLASS) (e.g., 255 Ω for Class 4), drawing 39.4 mA typical at 15 V; inrush current is programmed via R(ILIM) (e.g., 178 kΩ yields 130 mA typical); RTN serves as switched return rail with 515 mA absolute max sinking capability and monitors PG assertion when V(RTN) exceeds 9.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| UVLO Turn-off Threshold | 30.5 V (ensures reliable shutdown before PSE drops below IEEE 802.3af minimum) |
| UVLO Turn-on Threshold | 39.3 V (guarantees robust startup after PSE voltage rise, with 8.8 V hysteresis) |
| Pass Device rDS(on) | 0.58 Ω (minimizes conduction loss in 100-V PoE input path; rated for 515 mA continuous) |
| Fixed Current Limit | 450 mA (hard-clamped operational limit protects downstream DC/DC converter and cable) |
| Inrush Current Control | Programmable via R(ILIM) (178 kΩ sets ~130 mA typical; prevents VDD sag during bulk cap charging) |
| Power-Good Output | Open-drain PG (asserts high-Z when RTN ≥ 9.5 V and not in inrush; requires external pullup) |
| ESD Rating | 15 kV system-level (contact/air per EN61000-4-2 at RJ-45 interface) |
Pinout & Package
TPS2375DR is packaged in an 8-pin SOIC (SO-8, D package) with exposed pad for thermal performance. Pin 4 (VSS) is the local ground reference; Pin 5 (RTN) is the switched negative return rail; Pin 6 (PG) is open-drain power-good; Pin 8 (VDD) is the positive PoE input rail.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 ILIM | Inrush current programming input | Connects to VSS via resistor (e.g., 178 kΩ) to set start-up inrush limit; must not be left open or shorted |
| 2 CLASS | Classification current output | Sinks current through external R(CLASS) (e.g., 255 Ω) to signal Class 4 power level to PSE |
| 3 DET | Detection signature output | Sinks current through R(DET) = 24.9 kΩ during 2.7–10.1 V detection window; disconnects above 11.3 V |
| 4 VSS | Input supply return | Local ground reference for internal circuitry; connects to source side of input diode bridge |
| 5 RTN | Switched load return rail | Provides low-side return path for downstream DC/DC converter; monitored for PG assertion |
| 6 PG | Open-drain power-good output | High-impedance when RTN ≥ 9.5 V and no inrush; pulled to RTN internally otherwise |
| 7 NC | No connection | Not internally bonded; must remain unconnected on PCB |
| 8 VDD | PoE input positive rail | Accepts rectified 48 V PoE input; supplies internal bias and enables UVLO monitoring |
Key Features
| Feature | Design Value |
|---|---|
| IEEE 802.3af Compliance | Fully implements detection, classification, and powered operation with built-in hysteresis and timing margins |
| Integrated Low-Side Switch | 0.58-Ω, 100-V MOSFET eliminates need for external pass device and reduces BOM count |
| Programmable Inrush Limiting | R(ILIM)-based control allows precise tailoring of startup surge to match bulk capacitance and legacy PSE requirements |
| True Open-Drain PG | PG asserts high-Z only when RTN voltage meets threshold and inrush state ends-enables clean downstream enable sequencing |
| 15-kV System-Level ESD | Validated per EN61000-4-2 at RJ-45 interface-reduces need for external TVS on data lines |
Applications
| VoIP Phones | WLAN Access Points |
|---|---|
Use Scenario: Powered via Cat5e/6 cabling from enterprise PoE switch with 48 V input and up to 12.95 W available at PD input. IC Role / Device Role / Timing Role: PD controller managing detection, classification (Class 3 or 4), inrush limiting, and PG signaling to enable voice codec and Ethernet PHY. Use Value: Enables single-cable deployment without local AC adapter; fixed 450-mA current limit prevents cable overheating during sustained call traffic. |
Use Scenario: Indoor/outdoor wireless AP receiving PoE from midspan injector or switch, operating continuously with multiple concurrent clients. IC Role / Device Role / Timing Role: Controls PoE handshaking, regulates inrush into large DC/DC input capacitors, and asserts PG to enable RF front-end power rails. Use Value: Programmable R(ILIM) avoids brownout during Wi-Fi burst transmission; 100-V rating accommodates worst-case cable drop + surge margin. |
| Security Cameras | POS Terminals |
Use Scenario: Outdoor IP camera with IR illumination, requiring stable PoE under temperature extremes (–40°C to 85°C). IC Role / Device Role / Timing Role: Manages PoE startup sequence, monitors RTN for PG assertion, and provides thermal shutdown at 135°C junction. Use Value: Industrial temperature range ensures reliability in unconditioned enclosures; open-drain PG interfaces cleanly with camera SoC reset logic. |
Use Scenario: Retail point-of-sale terminal with Ethernet backhaul and integrated printer, deployed in high-noise retail environments. IC Role / Device Role / Timing Role: Provides IEEE-compliant PoE interface, isolates downstream 5 V/3.3 V rails via DC/DC, and signals power readiness to host MCU. Use Value: 15-kV ESD rating protects against electrostatic discharge from cashier handling; fixed UVLO thresholds ensure deterministic startup across varied store wiring. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Powered Device controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS2376DR | Features adjustable UVLO via dedicated UVLO pin (resistor divider); identical pinout and core functionality | Required where PSE output voltage varies significantly (e.g., legacy midspans <44 V); adds one external resistor pair | Select TPS2376DR only if UVLO threshold tuning is needed; otherwise TPS2375DR offers simpler, fixed-threshold design |
| TPS2377DR | Uses legacy UVLO thresholds (30.5 V off / 35.1 V on, 4.5 V hysteresis); same SO-8 package and pin compatibility | Suitable for older PoE infrastructure with slower-rising or lower-voltage PSE outputs; may exhibit marginal startup stability with compliant PSEs | Choose TPS2377DR only for field-replacement in legacy systems; TPS2375DR is preferred for new IEEE 802.3af-compliant designs |
Compared with TPS2376DR and TPS2377DR, the TPS2375DR delivers optimal hysteresis (8.8 V) and deterministic startup for modern 802.3af PSEs-eliminating UVLO tuning complexity while ensuring robust operation across full industrial temperature range and 100-V input transients.
Availability
TPS2375DR is available at Aetrix Electronics and suitable for VoIP phones, WLAN access points, security cameras, and POS terminals requiring stable component supply, long-term lifecycle support, and traceable sourcing for industrial PoE deployments.
Supply support for TPS2375DR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies with over 50 years of innovation in power management and interface solutions.
The TPS2375DR belongs to TI's IEEE 802.3af PD controller family, designed specifically to simplify PoE-powered endpoint development by integrating detection, classification, inrush control, and power switching into a single 8-pin SOIC device.
FAQ
What is the primary function of the TPS2375DR in a PoE system?
The TPS2375DR acts as the Powered Device (PD) controller, managing the full IEEE 802.3af handshake: detection (identifying valid PSE), classification (advertising power class), and powered operation (enabling downstream load). It integrates a 100-V low-side switch, fixed 450-mA current limit, programmable inrush control, and open-drain power-good output-all in an 8-pin SOIC package. The TPS2375DR ensures safe, standards-compliant power delivery to devices like VoIP phones and security cameras.
How does the TPS2375DR implement inrush current limiting?
The TPS2375DR uses its ILIM pin to accept an external resistor (R(ILIM)) connected to VSS. With R(ILIM) = 178 kΩ, the TPS2375DR limits inrush current to ~130 mA typical, preventing VDD sag during bulk capacitor charging. This programmability allows designers to match startup behavior to specific PSE capabilities and downstream capacitance-critical for avoiding false UVLO shutdown. The TPS2375DR requires R(ILIM) between 62.5 kΩ and 500 kΩ and must not leave ILIM floating or shorted.
What is the role of the PG pin on the TPS2375DR?
The PG (Power-Good) pin on the TPS2375DR is an open-drain output that goes high-impedance only when two conditions are met: RTN voltage exceeds 9.5 V and the device is not in inrush current limiting. It remains pulled to RTN otherwise. This precise timing enables downstream circuits (e.g., DC/DC enable inputs or microcontroller reset lines) to power up only after stable PoE operation begins. The TPS2375DR requires an external pullup resistor on PG to generate a logic-high signal for system enable sequencing.
Does the TPS2375DR support all IEEE 802.3af power classes?
Yes-the TPS2375DR supports all five IEEE 802.3af classes (0–4) via external R(CLASS) selection: 4420 Ω (Class 0), 953 Ω (Class 1), 549 Ω (Class 2), 357 Ω (Class 3), or 255 Ω (Class 4). Each value draws a defined classification current (e.g., 39.4 mA for Class 4 at 15 V), allowing the PSE to allocate appropriate power. The TPS2375DR automatically disconnects R(CLASS) outside the 13–21 V classification window to prevent overheating, ensuring reliable operation across all classes.
What thermal protection features does the TPS2375DR include?
The TPS2375DR incorporates internal thermal shutdown that activates at 135°C junction temperature, with 20°C hysteresis to prevent oscillation. This protection safeguards the device during overload, poor heatsinking, or ambient temperature extremes. Unlike many controllers, the TPS2375DR maintains full functionality-including detection, classification, and PG signaling-below this threshold. Its SO-8 package supports θJA = 238°C/W (low-K board), enabling reliable operation in industrial environments where ambient temperatures reach 85°C.
TPS2375DR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Controller (PD)
- Number of Channels:
- 1
- Power - Max:
- 12.95 W
- Internal Switch(s):
- Yes
- Auxiliary Sense:
- No
- Standards:
- 802.3af (PoE)
- Voltage - Supply:
- 0V ~ 57V
- Current - Supply:
- 240µA
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
TPS2375DR FAQ
1.How can I place an order for TPS2375DR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS2375DR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for TPS2375DR reliable?
The price and inventory of TPS2375DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS2375DR is usually 5 days.
3.What payment methods are accepted for TPS2375DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS2375DR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS2375DR?
TPS2375DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS2375DR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for TPS2375DR?
For technical support, including TPS2375DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS2375DR requirements.
6.How does Aetrix verify that TPS2375DR is sourced from the original manufacturer or authorized distributors?
All TPS2375DR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TPS2375DR meets industry standards.
7.What is the process for return or replacement of TPS2375DR?
All TPS2375DR units undergo pre-shipment inspection (PSI). If there is an issue with TPS2375DR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The TPS2375DR part is unused and in its original packaging.
Return procedure for TPS2375DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TPS2375DR Tags
-
TPS2378DDAR
Texas Instruments
-
TPS23753APWR
Texas Instruments
-
TPS23756PWPR
Texas Instruments
-
TPS23750PWPR
Texas Instruments
-
MP8007GV-Z
Monolithic Power Systems Inc.
-
TPS23861PWR
Texas Instruments
-
TPS23753PWR
Texas Instruments
-
PD69201ILD-TR
Microchip Technology
-
SI3402-B-GM
Skyworks Solutions Inc.
-
SI3402-B-GMR
Skyworks Solutions Inc.
-
SI34071-A01-GMR
Skyworks Solutions Inc.
-
SI3404-A-GMR
Skyworks Solutions Inc.
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
