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Texas Instruments TPS2376DR
- Part No.:
- TPS2376DR
- Manufacturer:
- Texas Instruments
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS2376DR.pdf
- Description:
- IC POE CNTRL 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,221
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Product details
Overview
TPS2376DR 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 UVLO via dedicated UVLO pin, 450-mA fixed operational current limit, and open-drain power-good (PG) output. It operates across –40°C to 85°C and supports Class 3 PD implementations in VoIP phones, WLAN access points, and security cameras.
For engineers reviewing the TPS2376DR datasheet, TPS2376DR pinout, TPS2376DR application, or TPS2376DR equivalent, this page delivers verified technical context, validated pin functions, confirmed IEEE 802.3af compliance parameters, real-world thermal and inrush behavior, and two rigorously cross-checked alternative controllers for PoE PD designs.
Technical Context
The TPS2376DR implements detection, classification, and undervoltage lockout using internal comparators with hysteresis-specifically, a programmable UVLO threshold set by an external resistor divider on the UVLO pin (1.93 V lower / 2.49 V upper nominal), while maintaining identical detection (1.4–11.3 V) and classification (13–21 V) voltage windows as the TPS2375 family. Its ILIM pin accepts a 178-kΩ resistor to set 100–180 mA inrush current, and CLASS pin sources classification current (27.1–41.2 mA) into a 255–4420-Ω resistor per IEEE Class 0–4.
It integrates a 100-V rated, 0.58-Ω low-side pass device with thermal shutdown at 135°C (20°C hysteresis), open-drain PG reporting with 75–225 µs deglitch, and 15-kV system-level ESD protection. Unlike TPS2375/TPS2377, the UVLO pin is functional and internally connected-enabling adjustable turn-on/turn-off thresholds without modifying the VDD sensing path.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IEEE Compliance | Fully compliant with IEEE 802.3af Powered Device requirements including detection, classification, and maintain-power signature (MPS). |
| UVLO Thresholds | Programmable: 1.93 V (falling) / 2.49 V (rising) at UVLO pin-enables custom turn-on/turn-off hysteresis independent of VDD rail. |
| Inrush Current Limit | Adjustable 100–180 mA via ILIM pin resistor (e.g., 178 kΩ yields ~130 mA); terminates when RTN current falls below 85–100% of inrush value. |
| Operational Current Limit | Fixed 405–515 mA sinking capability at RTN pin-ensures PSE current-limit compliance during steady-state operation. |
| Pass Device RDS(on) | 0.58 Ω typical at 300 mA-minimizes conduction loss and thermal rise in low-side switching path. |
| Power-Good Output | Open-drain PG with 9.5–10.5 V latchoff threshold and 75–225 µs deglitch-provides reliable downstream enable signaling after stable regulation. |
| ESD Rating | 15-kV system-level contact/air discharge at RJ-45 interface-meets IEC 61000-4-2 for robust field deployment. |
Pinout & Package
TPS2376DR is available in SOIC-8 (D−8) and TSSOP-8 (PW−8) packages. Both are surface-mount, RoHS-compliant, and rated for industrial temperature range (–40°C to +85°C). The SOIC-8 variant features 1.27-mm pitch and standard gull-wing leads; TSSOP-8 uses 0.65-mm pitch and thinner profile for space-constrained PoE modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ILIM (Pin 1) | Inrush current programming input | Connects to VSS via resistor (62.5–500 kΩ) to set start-up inrush limit; must not be left open or shorted. |
| CLASS (Pin 2) | Classification current source | Sources precise current (27.1–41.2 mA) into external resistor (255–4420 Ω) to signal IEEE 802.3af Class 0–4 power level. |
| DET (Pin 3) | Detection signature driver | Pulls to VSS through R(DET) = 24.9 kΩ during 1.4–11.3 V input window to generate 25-kΩ incremental resistance signature. |
| VSS (Pin 4) | Input return reference | Local ground for detection/classification circuitry; serves as source for DET, CLASS, and ILIM current paths. |
| RTN (Pin 5) | Switched load return | Low-side output node for downstream DC/DC converter or load; carries full operational current (≤515 mA) and enables PG monitoring. |
| PG (Pin 6) | Open-drain power-good indicator | High-impedance when RTN is enabled and inrush complete; pulled to RTN otherwise-requires external pullup for logic-level signaling. |
| UVLO (Pin 7) | Programmable UVLO sense input | Dedicated pin for resistor divider from VDD to VSS; sets custom upper/lower lockout thresholds-unconnected on TPS2375/TPS2377. |
| VDD (Pin 8) | Main input supply | Accepts rectified PoE input (0–57 V); powers internal circuitry and provides voltage reference for all comparators and regulators. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable UVLO | Enables custom turn-on/turn-off thresholds via external resistor divider on UVLO pin-critical for legacy PSE compatibility and brownout resilience. |
| Integrated Low-Side Switch | 0.58-Ω, 100-V rated MOSFET eliminates need for external pass transistor-reduces BOM count and PCB area in PoE front-end designs. |
| Adjustable Inrush Control | ILIM pin supports 100–180 mA inrush current setting-prevents cable voltage sag during bulk capacitor charging while accommodating large output capacitance. |
| Open-Drain Power-Good | PG output asserts only after stable RTN regulation and inrush completion-provides clean enable signal to downstream DC/DC converters or microcontrollers. |
| 15-kV System-Level ESD | Validated per IEC 61000-4-2 at RJ-45 interface-ensures reliability in unshielded Ethernet environments without additional transient protection. |
Applications
| VoIP Phones | WLAN Access Points |
|---|---|
Use Scenario: Powered via Category 5/6 Ethernet cabling in enterprise office deployments with centralized PoE switches. IC Role / Device Role / Timing Role: PD controller managing detection, classification, and regulated power delivery to baseband processor, codec, and RF subsystem. Use Value: Enables single-cable deployment with guaranteed 12.95 W input power budget and seamless interoperability with IEEE 802.3af PSEs. |
Use Scenario: High-density wireless infrastructure requiring remote powering across ceiling-mounted installations. IC Role / Device Role / Timing Role: Primary PD interface controlling power sequencing to dual-band radios, MAC processor, and memory subsystem. Use Value: Delivers stable 450-mA current-limited output and programmable UVLO to sustain operation during cable voltage drop under peak RF transmit load. |
| Security Cameras | POS Terminals |
Use Scenario: Outdoor IP cameras with IR illumination and video streaming, deployed over long Ethernet runs (>50 m). IC Role / Device Role / Timing Role: PoE front-end controller enabling inrush management, thermal protection, and PG-locked power enable to image sensor and encoder. Use Value: Maintains operation down to 30 V input (via UVLO hysteresis tuning) and withstands 15-kV ESD events common in exposed outdoor ports. |
Use Scenario: Retail point-of-sale terminals with integrated barcode scanners, displays, and payment interfaces. IC Role / Device Role / Timing Role: Centralized PD controller coordinating power delivery to multiple peripherals via controlled RTN ramp and PG handshake. Use Value: Ensures deterministic startup timing and fault isolation-prevents scanner/display lockup during PoE port reconnection or PSE cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar powered device controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS2375DR | Fixed UVLO thresholds (30.5 V / 39.3 V), no UVLO pin-uses VDD-sensed comparator with 8.8 V hysteresis. | Better suited for new designs targeting full IEEE 802.3af compliance with modern PSEs; lacks programmability for marginal input conditions. | Select TPS2375DR when UVLO adjustment is unnecessary and cost-sensitive BOM optimization is prioritized. |
| TPS2377DR | Legacy UVLO thresholds (30.5 V / 35.1 V), fixed hysteresis (4.5 V); same pinout but non-programmable. | Optimized for older PSEs with lower output voltage (e.g., pre-2003 switches); may exhibit instability with slow-rising compliant PSE outputs. | Choose TPS2377DR only for field-replacement in legacy systems where UVLO tuning is not required and PSE voltage margin is known to be tight. |
Compared with TPS2375DR and TPS2377DR, the TPS2376DR uniquely provides externally adjustable UVLO thresholds-enabling robust operation across diverse PSE generations without hardware redesign or layout changes, while retaining identical detection, classification, and current-limit functionality.
Availability
TPS2376DR 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 guaranteed traceable sourcing for industrial PoE deployments.
Supply support for TPS2376DR 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 management and industrial interface solutions.
The TPS237x family was designed specifically for IEEE 802.3af Power over Ethernet powered devices-delivering integrated detection, classification, UVLO, inrush control, and low-side switching in compact 8-pin packages for space- and cost-sensitive networked equipment.
FAQ
What is the primary function of the UVLO pin on the TPS2376DR?
The UVLO pin on the TPS2376DR is a dedicated input for an external resistor divider that sets programmable upper and lower undervoltage lockout thresholds (1.93 V falling / 2.49 V rising nominal). Unlike the TPS2375DR and TPS2377DR, this pin is internally connected and enables precise customization of turn-on/turn-off behavior-critical for compatibility with legacy PSEs or brownout-prone installations. This feature is exclusive to the TPS2376DR within the family.
How does the TPS2376DR implement IEEE 802.3af detection and classification?
The TPS2376DR implements IEEE 802.3af detection by pulling the DET pin to VSS through a 24.9-kΩ resistor during the 1.4–11.3 V input window, generating the required 25-kΩ incremental resistance signature. For classification, it sources precise current (27.1–41.2 mA) from the CLASS pin into an external resistor (255–4420 Ω) when VDD is between 13–21 V-signaling Class 0–4 per Table 1. These functions are identical across the TPS2375/76/77 family.
What is the maximum continuous current the TPS2376DR can deliver at the RTN pin?
The TPS2376DR delivers a fixed operational current limit of 405–515 mA at the RTN pin under steady-state conditions, as specified in its Electrical Characteristics table. This limit ensures compliance with IEEE 802.3af PSE current constraints and protects downstream circuitry. The device also supports adjustable inrush current (100–180 mA) via the ILIM pin-but this is time-limited and transitions to the fixed 450-mA limit once inrush completes.
Does the TPS2376DR require an external MOSFET, or is the switch integrated?
The TPS2376DR integrates a 100-V rated, 0.58-Ω low-side MOSFET switch-no external pass transistor is required. This integrated switch connects between the RTN pin and internal ground, enabling direct control of power delivery to downstream loads such as DC/DC converters or PoE-powered subsystems. The integration reduces solution size, component count, and layout complexity compared to discrete controller + FET architectures.
What package options are available for the TPS2376DR, and are they pin-compatible?
The TPS2376DR is offered in SOIC-8 (D−8) and TSSOP-8 (PW−8) packages. Both share identical pinout, electrical characteristics, and thermal performance specifications-making them functionally and mechanically interchangeable in layout. The SOIC-8 variant uses 1.27-mm lead pitch and is optimized for manual assembly or wave soldering; the TSSOP-8 uses 0.65-mm pitch and thinner profile for high-density automated PCB assembly.
TPS2376DR 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
TPS2376DR FAQ
1.How can I place an order for TPS2376DR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS2376DR 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 TPS2376DR reliable?
The price and inventory of TPS2376DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS2376DR is usually 5 days.
3.What payment methods are accepted for TPS2376DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS2376DR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS2376DR?
TPS2376DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS2376DR 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 TPS2376DR?
For technical support, including TPS2376DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS2376DR requirements.
6.How does Aetrix verify that TPS2376DR is sourced from the original manufacturer or authorized distributors?
All TPS2376DR 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 TPS2376DR meets industry standards.
7.What is the process for return or replacement of TPS2376DR?
All TPS2376DR units undergo pre-shipment inspection (PSI). If there is an issue with TPS2376DR, 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 TPS2376DR part is unused and in its original packaging.
Return procedure for TPS2376DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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