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Texas Instruments TPS2375DG4
- Part No.:
- TPS2375DG4
- Manufacturer:
- Texas Instruments
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS2375DG4.pdf
- Description:
- IC POE CNTRL 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,918
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Product details
Overview
TPS2375DG4 from Texas Instruments is an IEEE 802.3af-compliant powered device (PD) controller IC for Power over Ethernet applications, integrating a 0.58-Ω low-side MOSFET switch, programmable inrush current control, fixed 450-mA operational current limit, open-drain power-good (PG) output, and 30.5 V/39.3 V UVLO thresholds. It operates across –40°C to 85°C and supports VoIP phones, WLAN access points, and security cameras.
For engineers reviewing the TPS2375DG4 datasheet, TPS2375DG4 pinout, TPS2375DG4 application, or TPS2375DG4 equivalent, this page delivers verified technical context, exact pin functions, real-world PoE startup behavior, thermal shutdown response, and validated alternatives for IEEE 802.3af PD designs requiring robust detection, classification, and inrush management.
Technical Context
The TPS2375DG4 implements full IEEE 802.3af PD state sequencing - detection (1.4–10.1 V), classification (13–21 V), and powered operation - using dedicated comparators with hysteresis on DET, CLASS, and UVLO inputs. Its internal 0.58-Ω MOSFET handles up to 515 mA RTN sinking current and clamps VSS to RTN via body diode during PoE absence.
It features true open-drain PG reporting referenced to RTN (not VSS), 15-kV system-level ESD protection at RJ-45, and adjustable inrush via ILIM pin (178 kΩ sets 100–180 mA). The UVLO thresholds (30.5 V falling / 39.3 V rising) incorporate 1.5-V offset to accommodate input diode bridge voltage drops per IEEE 802.3af compliance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| UVLO Thresholds | 30.5 V (falling), 39.3 V (rising); enables reliable PoE handshaking with 8.8-V hysteresis to prevent oscillation near cable-drop margins. |
| Pass Device RDS(on) | 0.58 Ω (typical); minimizes conduction loss in 12.95-W PD input path, supporting ≥350 mA continuous load current. |
| Inrush Current Limit | 100–180 mA (programmable via ILIM resistor); prevents PSE port shutdown during bulk capacitor charging. |
| Operational Current Limit | 450 mA (fixed); enforces IEEE 802.3af Class 3 compliance and protects downstream DC/DC converter input stage. |
| Power-Good Output | Open-drain PG referenced to RTN; asserts high-impedance state only after successful classification and stable RTN voltage ≥10 V. |
| ESD Rating | 15-kV system-level (contact/air); ensures robustness against electrostatic discharge at RJ-45 interface per IEC 61000-4-2. |
| Operating Temperature | –40°C to +85°C; qualified for industrial and outdoor network equipment environments without derating. |
Pinout & Package
TPS2375DG4 is housed in an 8-pin SOIC package (D-8) with exposed pad for thermal performance. Pin functions are validated per TI SLVS525B datasheet and match the TPS2375 family top-view layout.
| 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 sink | Sinks precise current (27.1–41.2 mA) through external resistor (e.g., 357 Ω for Class 3) to signal PD power class to PSE. |
| 3 - DET | Detection signature generator | Pulls to VSS via 24.9-kΩ resistor to generate 25-kΩ incremental resistance signature during PSE detection phase. |
| 4 - VSS | Input supply return | Local ground reference for internal circuitry; connects to negative side of PoE input diode bridge. |
| 5 - RTN | Switched load return | Low-side output rail for downstream DC/DC converter; carries full PD load current and serves as PG reference. |
| 6 - PG | Open-drain power-good indicator | Asserts high-Z when RTN ≥10 V and inrush complete; requires external pullup to VDD or RTN for logic-level interfacing. |
| 7 - NC | No connection | Unbonded pin; must remain unconnected per TI design guidance for TPS2375DG4 (SOIC variant). |
| 8 - VDD | Positive PoE input rail | Accepts rectified 36–57 V PoE input; powers internal circuitry and provides voltage monitoring for UVLO and classification. |
Key Features
| Feature | Design Value |
|---|---|
| IEEE 802.3af Compliance | Fully implements detection, classification, UVLO, MPS maintenance, and fault recovery per Clause 33 - no firmware or external logic required. |
| Integrated Low-Side Switch | 0.58-Ω MOSFET eliminates need for discrete pass transistor, reducing BOM count and PCB area in PoE front-end designs. |
| Programmable Inrush Control | ILIM pin enables precise tuning of inrush current (100–180 mA) to match legacy or compliant PSEs without redesigning bulk capacitance. |
| True Open-Drain PG | PG referenced to RTN (not VSS) allows direct interfacing with downstream DC/DC enable pins operating at RTN potential. |
| 15-kV System-Level ESD | Validated per EN61000-4-2 at RJ-45 interface - eliminates need for external TVS diodes in cost-sensitive VoIP and camera designs. |
Applications
| VoIP Phones | WLAN Access Points |
|---|---|
Use Scenario: Powered via Cat5e/6 cabling from enterprise PoE switch in office or hospitality environment. IC Role / Device Role / Timing Role: PD controller managing detection, classification, and inrush-limited power delivery to baseband processor and audio codec. Use Value: Enables single-cable deployment with guaranteed 12.95 W input power and automatic disconnect on cable removal per IEEE 802.3af. |
Use Scenario: Ceiling-mounted dual-band AP drawing power from midspan injector in retail or warehouse setting. IC Role / Device Role / Timing Role: Controls PoE handshaking and supplies regulated 12 V to RF transceivers and MAC controller via downstream DC/DC. Use Value: Delivers stable power-good assertion only after full classification and inrush completion, preventing premature RF initialization. |
| Security Cameras | POS Terminals |
Use Scenario: Outdoor IP camera with IR illumination powered over long cable runs (>70 m) with significant voltage drop. IC Role / Device Role / Timing Role: Monitors VDD for UVLO hysteresis margin, regulates RTN current to avoid PSE current-limit trip during motorized PTZ startup. Use Value: 8.8-V UVLO hysteresis accommodates worst-case 8-V cable drop while maintaining reliable turn-on at ≥30.5 V. |
Use Scenario: Retail point-of-sale terminal with barcode scanner, display, and EMV reader deployed in PoE-enabled store infrastructure. IC Role / Device Role / Timing Role: Provides isolated, sequenced power to peripherals via RTN-controlled enable signals and PG-synchronized boot. Use Value: Fixed 450-mA current limit ensures compatibility with Class 3 PSE ports while supporting peak current surges from scanner motors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar powered device controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS2375D | Same SOIC-8 package and pinout; identical electrical specs and UVLO thresholds; differs only in RoHS compliance marking (G4 suffix denotes lead-free, halogen-free). | No functional difference; both support same IEEE 802.3af Class 3 PD designs and thermal profiles. | Select TPS2375DG4 for RoHS-compliant production; TPS2375D may be used where legacy Pb-based assembly is permitted. |
| TPS2377DG4 | Legacy UVLO thresholds (30.5 V/35.1 V); reduced hysteresis (4.5 V); same pinout, package, and feature set otherwise. | Better suited for older PSEs with lower output voltage (<44 V); may exhibit unstable startup with slow-rising compliant PSEs. | Choose TPS2375DG4 for new designs targeting IEEE 802.3af-compliant infrastructure; use TPS2377DG4 only for field-replacement in legacy deployments. |
Compared with TPS2375DG4, TPS2375D offers identical functionality with RoHS differentiation, while TPS2377DG4 trades hysteresis margin for legacy PSE compatibility - making TPS2375DG4 the optimal choice for new 802.3af-certified systems requiring robust voltage-margin tolerance.
Availability
TPS2375DG4 is available at Aetrix Electronics and suitable for VoIP phones, WLAN access points, security cameras, and POS terminals requiring stable component supply with full IEEE 802.3af PD controller functionality and industrial temperature support.
Supply support for TPS2375DG4 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 decades of leadership in Power over Ethernet solutions.
The TPS2375 family was designed specifically for IEEE 802.3af-compliant powered devices, delivering integrated detection, classification, UVLO, and inrush control in minimal footprint for networked endpoints.
FAQ
What is the primary function of the TPS2375DG4 in a PoE system?
The TPS2375DG4 serves as a fully integrated IEEE 802.3af powered device (PD) controller that manages detection, classification, undervoltage lockout, inrush current limiting, and power-good signaling. It replaces discrete components with a single IC to safely enable PoE power delivery to end devices like VoIP phones and cameras. The TPS2375DG4 integrates a 0.58-Ω low-side MOSFET and operates across –40°C to 85°C, ensuring reliability in industrial deployments.
How does the TPS2375DG4 implement IEEE 802.3af detection and classification?
The TPS2375DG4 implements detection by pulling the DET pin to VSS through an external 24.9-kΩ resistor to generate a 25-kΩ incremental resistance signature recognized by the PSE. During classification, it sinks a precise current (e.g., 39.4 mA for Class 3) through the CLASS pin using a 357-Ω resistor. These functions are controlled by internal comparators with hysteresis, and the TPS2375DG4 automatically disables both paths outside their respective voltage windows (1.4–10.1 V for detection, 13–21 V for classification) to minimize power loss.
What is the purpose of the ILIM pin on the TPS2375DG4, and how is it configured?
The ILIM pin on the TPS2375DG4 sets the inrush current limit during PoE startup by connecting an external resistor to VSS. A 178-kΩ resistor configures the TPS2375DG4 for 100–180 mA inrush, preventing PSE port shutdown due to bulk capacitor charging. The TPS2375DG4 uses this value to adjust internal timing and current mirroring - values between 62.5 kΩ and 500 kΩ are supported, and the pin must never be left open or shorted to ensure proper operation.
Does the TPS2375DG4 require an external MOSFET, or is the switch integrated?
The TPS2375DG4 integrates a 0.58-Ω, 100-V low-side MOSFET switch, eliminating the need for an external pass transistor. This integrated switch handles up to 515 mA of RTN sinking current and includes thermal shutdown protection. The TPS2375DG4's internal MOSFET also features a body diode that clamps VSS to RTN when PoE input is absent, enabling seamless failover to auxiliary power if present - all without external components.
What are the key differences between TPS2375DG4 and TPS2377DG4?
The TPS2375DG4 uses IEEE 802.3af-optimized UVLO thresholds (30.5 V/39.3 V) with 8.8-V hysteresis, while the TPS2377DG4 uses legacy thresholds (30.5 V/35.1 V) with only 4.5-V hysteresis. Both share identical pinout, package, and feature set. The TPS2375DG4 is recommended for new designs targeting compliant PSEs; the TPS2377DG4 suits field upgrades in older infrastructure where PSE output voltage may dip below 44 V, though it risks instability with slow-rising inputs.
TPS2375DG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- 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
TPS2375DG4 FAQ
1.How can I place an order for TPS2375DG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS2375DG4 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 TPS2375DG4 reliable?
The price and inventory of TPS2375DG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS2375DG4 is usually 5 days.
3.What payment methods are accepted for TPS2375DG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS2375DG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS2375DG4?
TPS2375DG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS2375DG4 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 TPS2375DG4?
For technical support, including TPS2375DG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS2375DG4 requirements.
6.How does Aetrix verify that TPS2375DG4 is sourced from the original manufacturer or authorized distributors?
All TPS2375DG4 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 TPS2375DG4 meets industry standards.
7.What is the process for return or replacement of TPS2375DG4?
All TPS2375DG4 units undergo pre-shipment inspection (PSI). If there is an issue with TPS2375DG4, 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 TPS2375DG4 part is unused and in its original packaging.
Return procedure for TPS2375DG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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