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Texas Instruments TPS2376DDAR-HG4
- Part No.:
- TPS2376DDAR-HG4
- Manufacturer:
- Texas Instruments
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS2376DDAR-HG4.pdf
- Description:
- IC POE CNTRL 1 CHANNEL 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:3,875
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Product details
Overview
TPS2376DDAR-HG4 from Texas Instruments is an IEEE 802.3af-compliant powered device (PD) controller with integrated 0.58-Ω low-side MOSFET, 600-mA operational current limit, adjustable inrush current limiting via ILIM pin, and true open-drain power-good output referenced to RTN. It enables 26-W PoE designs over 100 m of CAT-5 cable from a 52-V minimum PSE supply and operates across –40°C to 85°C.
For engineers reviewing the TPS2376DDAR-HG4 datasheet, TPS2376DDAR-HG4 pinout, TPS2376DDAR-HG4 application, or TPS2376DDAR-HG4 equivalent, key selection considerations include its 100-V absolute maximum rating, programmable UVLO thresholds, thermal shutdown at 135°C, 15-kV system-level ESD capability, and compatibility with legacy and high-power PoE implementations requiring robust inrush control and fault auto-retry.
Technical Context
The TPS2376DDAR-HG4 implements a state-machine-controlled PoE interface with three distinct operational phases: detection (using 24.9-kΩ DET resistor), classification (via CLASS pin resistor), and powered operation (with RTN-sinking output). Its UVLO circuit uses an external resistor divider on the UVLO pin to set turn-on (2.49 V typical) and turn-off (1.93 V typical) thresholds, enabling compliance with IEEE 802.3af or custom voltage windows.
It features dual current-limit modes: programmable inrush limit (e.g., 140 mA with 287-kΩ ILIM resistor) and fixed 765-mA operational limit, with foldback transition triggered by >10-V MOSFET voltage for overload protection. The PG output asserts after inrush decay and remains open-drain until RTN exceeds 10 V or fault conditions occur.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Input Voltage | 100 V - withstands surge transients and ensures robustness against PSE overvoltage events |
| Operational Current Limit | 765 mA typical - supports up to 26 W at 36 V RTN output, enabling high-power PD designs |
| Inrush Current Limit | Programmable 140–296 mA - set via ILIM-to-VSS resistor (e.g., 287 kΩ yields 140 mA) to prevent cable sag and PSE tripping |
| UVLO Thresholds | Rising: 2.49 V; Falling: 1.93 V - defines 39.5 V turn-on / 30 V turn-off at VDD with standard resistor divider |
| Power-Good Output | Open-drain, RTN-referenced - asserts ~150 µs after inrush decay, enabling safe DC/DC converter startup |
| Thermal Shutdown | 135°C with 20°C hysteresis - protects internal MOSFET during sustained overload or poor PCB thermal design |
| ESD Rating | ±15 kV air-gap (IEC 61000-4-2 at RJ-45) - meets industrial system-level ESD immunity requirements |
Pinout & Package
TPS2376DDAR-HG4 is housed in an 8-pin SOIC package with PowerPad™ (DDA), measuring 4.89 mm × 3.90 mm. The exposed PowerPad must be soldered to a large VSS copper pour for effective thermal dissipation (RθJA = 45°C/W best-case).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ILIM | Inrush current programming input | Resistor to VSS sets inrush limit; 287 kΩ yields 140 mA - critical for bulk capacitor charging without PSE dropout |
| CLASS | IEEE 802.3af classification current sink | Resistor to VSS selects power class (e.g., 255 Ω = Class 4, 39.4 mA); optional in nonstandard high-power systems |
| DET | Detection signature node | Connects 24.9-kΩ resistor to VDD; forms 25-kΩ detection signature required for PSE recognition |
| VSS | Input negative rail / local ground | Reference for all internal circuits; PowerPad must be connected here for thermal and electrical integrity |
| VDD | Positive PoE input supply | Rectified PSE voltage input; powers internal circuitry and serves as voltage monitoring point |
| UVLO | Undervoltage lockout comparator input | External resistor divider sets turn-on/turn-off thresholds; also contributes to detection signature |
| PG | Open-drain power-good output | Asserts high-impedance when RTN is stable and inrush complete; referenced to RTN, not VSS |
| RTN | Switched output return | Sinks load current up to 600 mA; used as reference for PG and current sensing; body diode clamps VSS during no-PoE condition |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable UVLO thresholds | Enables precise alignment with IEEE 802.3af (39.5 V on / 30 V off) or custom PSE voltage windows via external divider |
| Programmable inrush current limit | Supports 140–296 mA range using 125–1000 kΩ ILIM resistor - accommodates large bulk capacitors and legacy PSEs |
| True RTN-referenced PG output | Eliminates level-shifting complexity for DC/DC enable; ensures safe startup only after stable RTN voltage and inrush completion |
| Integrated 0.58-Ω, 100-V low-side switch | Reduces external component count and conduction losses; rated for 600-mA continuous operation with thermal foldback |
| Auto-retry fault protection | Recovers automatically from overcurrent or thermal faults - maintains PoE link availability without host intervention |
Applications
| VoIP Video Phones | WiMAX Access Points |
|---|---|
Use Scenario: Powered VoIP video phones with camera, speaker, and Ethernet connectivity deployed in enterprise offices. IC Role / Device Role / Timing Role: PD controller managing PoE handshaking, inrush control, and power-good signaling to enable downstream DC/DC converters. Use Value: Enables single-cable deployment with 26 W headroom for active imaging and audio processing, while maintaining IEEE 802.3af interoperability. | Use Scenario: Outdoor WiMAX base stations requiring reliable remote power over long Ethernet runs. IC Role / Device Role / Timing Role: High-voltage-tolerant PD interface ensuring stable power delivery despite cable drop and environmental voltage transients. Use Value: 100-V rating and ±15-kV ESD immunity ensure uninterrupted operation in unshielded outdoor installations with lightning-prone environments. |
| IP Security Cameras | RFID Readers |
Use Scenario: Day/night IP cameras with IR illumination, pan-tilt-zoom motors, and real-time video streaming. IC Role / Device Role / Timing Role: Power management core coordinating detection, classification, and regulated RTN output for motor drivers and image sensors. Use Value: Programmable inrush limit prevents PSE shutdown during motor startup surges; thermal shutdown protects against enclosure overheating. | Use Scenario: Industrial RFID readers mounted on factory floors with metal enclosures and variable ambient temperatures. IC Role / Device Role / Timing Role: Robust PoE interface supporting wide temperature range (–40°C to 85°C) and maintaining MPS under fluctuating load conditions. Use Value: Industrial-grade thermal performance and auto-retry fault handling ensure continuous tag interrogation without manual reset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar powered device controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS23753APWPR | 400-mA operational limit; TSSOP-20 package; includes integrated DC/DC controller | Targeted for lower-power (<13 W), integrated PoE-powered systems with onboard flyback control | Select when combining PD interface and isolated DC/DC control reduces BOM cost and board space |
| LT4275AIMSE#TRPBF | 600-mA limit; 100-V rating; I²C interface for advanced classification and diagnostics | Suited for smart PoE systems requiring dynamic power negotiation and telemetry reporting | Select when IEEE 802.3at/af compliance with digital communication and fault logging is required |
Compared with TPS2376DDAR-HG4, TPS23753APWPR offers integrated power conversion but lower current capacity, while LT4275AIMSE#TRPBF adds digital configurability at the cost of higher system complexity - TPS2376DDAR-HG4 remains optimal for cost-sensitive, high-reliability 26-W analog PoE endpoints.
Availability
TPS2376DDAR-HG4 is available at Aetrix Electronics and suitable for VoIP video phones, IP security cameras, WiMAX access points, and RFID readers requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for TPS2376DDAR-HG4 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 company delivering analog and embedded processing solutions, with leadership in power management, signal chain, and connectivity technologies.
The TPS2376DDAR-HG4 belongs to TI's Power-over-Ethernet (PoE) Powered Device Controller product line, designed specifically for high-reliability, high-power IEEE 802.3af-compliant endpoints in industrial, surveillance, and communications infrastructure.
FAQ
What is the maximum continuous current supported by the TPS2376DDAR-HG4?
The TPS2376DDAR-HG4 supports a continuous operational current limit of 765 mA typical (625–900 mA min–max), enabling up to 26 W of delivered power when paired with a 36-V RTN output. This rating assumes proper PCB thermal design with the PowerPad connected to a large VSS copper area to maintain junction temperature below 125°C under full load.
How does the TPS2376DDAR-HG4 implement inrush current limiting?
The TPS2376DDAR-HG4 implements inrush current limiting via the ILIM pin: a resistor (e.g., 287 kΩ) from ILIM to VSS programs the initial current limit (140 mA typical). During bulk capacitor charging, the device holds this limit until current falls ~10% below the programmed value for 150 µs, then transitions to the higher 765-mA operational limit - preventing PSE tripping and cable voltage sag.
Can the TPS2376DDAR-HG4 be used in non-IEEE 802.3af compliant systems?
Yes, the TPS2376DDAR-HG4 supports nonstandard high-power PoE implementations. Its adjustable UVLO, programmable inrush, and flexible classification (including optional omission of CLASS resistor) allow operation beyond IEEE 802.3af limits - e.g., constructing 26-W PDs from 52-V PSE supplies over CAT-5 cable without requiring Class 4 signature.
What is the role of the RTN pin in the TPS2376DDAR-HG4?
The RTN pin is the switched negative output rail that sinks load current up to 600 mA. It serves as the return path for downstream circuits, the reference for the PG output, and the sensing node for current limiting and thermal foldback. Its voltage relative to VSS determines PG assertion and triggers foldback if MOSFET VDS exceeds 10 V.
Does the TPS2376DDAR-HG4 require an external detection resistor?
Yes, the TPS2376DDAR-HG4 requires a 24.9-kΩ resistor between DET and VDD to form the IEEE 802.3af-compliant 25-kΩ detection signature. Alternatively, the UVLO resistor divider alone can be configured to provide the 24.9-kΩ signature, eliminating the DET resistor - reducing component count but slightly lowering efficiency during normal operation.
TPS2376DDAR-HG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-SO PowerPad
TPS2376DDAR-HG4 FAQ
1.How can I place an order for TPS2376DDAR-HG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS2376DDAR-HG4 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 TPS2376DDAR-HG4 reliable?
The price and inventory of TPS2376DDAR-HG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS2376DDAR-HG4 is usually 5 days.
3.What payment methods are accepted for TPS2376DDAR-HG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS2376DDAR-HG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS2376DDAR-HG4?
TPS2376DDAR-HG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS2376DDAR-HG4 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 TPS2376DDAR-HG4?
For technical support, including TPS2376DDAR-HG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS2376DDAR-HG4 requirements.
6.How does Aetrix verify that TPS2376DDAR-HG4 is sourced from the original manufacturer or authorized distributors?
All TPS2376DDAR-HG4 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 TPS2376DDAR-HG4 meets industry standards.
7.What is the process for return or replacement of TPS2376DDAR-HG4?
All TPS2376DDAR-HG4 units undergo pre-shipment inspection (PSI). If there is an issue with TPS2376DDAR-HG4, 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 TPS2376DDAR-HG4 part is unused and in its original packaging.
Return procedure for TPS2376DDAR-HG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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