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Texas Instruments TPS2376D
- Part No.:
- TPS2376D
- Manufacturer:
- Texas Instruments
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS2376D.pdf
- Description:
- IC POE CNTRL 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:420
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Product details
Overview
TPS2376D 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, fixed 450-mA 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 and security cameras.
For engineers reviewing the TPS2376D datasheet, TPS2376D pinout, TPS2376D application, or TPS2376D equivalent, this page delivers verified technical context on PoE detection/classification thresholds, inrush current programming via ILIM, RTN-sourced load switching, and UVLO resistor-divider configuration - all critical for robust IEEE 802.3af system integration.
Technical Context
The TPS2376D implements full IEEE 802.3af PD state sequencing: detection (1.4–11.3 V), classification (13–21 V), and powered operation (>21.9 V), with internal comparators featuring hysteresis for stable mode transitions. Its UVLO circuit accepts an external resistor divider on the UVLO pin to set adjustable upper/lower turn-on thresholds (e.g., 38.4–40.4 V rising, 29.6–31.5 V falling).
It integrates a 100-V rated, 0.58-Ω low-side pass transistor with thermal shutdown (135°C), programmable inrush current control (via 62.5–500 kΩ ILIM resistor), and classification current sourcing (38.0–41.2 mA at RCLASS = 255 Ω). PG reporting is open-drain and referenced to RTN, requiring external pull-up for logic-level interfacing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| UVLO Threshold (Rising) | 38.4–40.4 V at VDD: sets minimum input voltage required to enable RTN output and downstream DC/DC converter |
| UVLO Threshold (Falling) | 29.6–31.5 V at VDD: defines lower limit before RTN disable and system shutdown to prevent brownout operation |
| Operational Current Limit | 405–515 mA at RTN: hard current limit protecting cable and PSE during steady-state load conditions |
| Inrush Current Limit Range | 100–180 mA (with RILIM = 178 kΩ): programmable soft-start prevents input voltage sag during bulk capacitor charging |
| Pass Device rDS(on) | 0.58 Ω typical at 300 mA: low conduction loss enables high-efficiency power delivery to downstream converters |
| Classification Current | 38.0–41.2 mA with RCLASS = 255 Ω: signals Class 3 (6.49–12.95 W) compliance to PSE during classification phase |
| Power-Good Output | Open-drain, RTN-referenced: asserts high-impedance state only when RTN is enabled and inrush completed |
Pinout & Package
TPS2376D is available in SOIC-8 (D−8) package with exposed pad not present; pin functions are validated per TI SLVS525B datasheet Figure 2 and Terminal Functions table.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VSS (Pin 4) | Input return reference | Local ground for internal bias circuits; connects to source side of input diode bridge |
| RTN (Pin 5) | Switched load return | Low-side output node delivering controlled current to downstream DC/DC converter input |
| PG (Pin 6) | Power-good status | Open-drain output pulled to RTN internally; requires external pull-up to signal valid power delivery |
| UVLO (Pin 7) | Adjustable UVLO input | Analog input accepting resistor divider from VDD to VSS to set custom upper/lower lockout thresholds |
| VDD (Pin 8) | Main power input | Positive rail from rectified PSE output; supplies internal circuitry and serves as voltage monitoring point |
Key Features
| Feature | Design Value |
|---|---|
| Programmable UVLO | Resistor-divider configurable thresholds (e.g., 39.3 V rising / 30.5 V falling) enable compatibility with legacy and compliant PSEs |
| Integrated low-side switch | 0.58-Ω rDS(on), 100-V rating eliminates need for external MOSFET and reduces BOM count in PoE front-end |
| IEEE 802.3af compliance | Fully implements detection (2.7–10.1 V), classification (13–21 V), and maintain-power-signature (MPS) timing requirements |
| 15-kV system-level ESD | Robustness tested per EN61000-4-2 at RJ-45 interface ensures field reliability in unshielded Ethernet environments |
| Thermal shutdown | 135°C trip with 20°C hysteresis prevents latch-up during sustained overload or poor heatsinking conditions |
Applications
| VoIP Phones | WLAN Access Points |
|---|---|
Use Scenario: Powered via Cat5e Ethernet cable from PoE-enabled switch in enterprise office deployment. IC Role / Device Role / Timing Role: PD controller managing detection, classification, and regulated power delivery to baseband processor and audio codec. Use Value: Enables single-cable deployment without local AC adapter; programmable UVLO ensures startup under variable cable drop conditions. |
Use Scenario: Wall-mounted wireless access point drawing power and data over same Ethernet link in hotel or campus network. IC Role / Device Role / Timing Role: Controls inrush limiting during boot, sustains 450-mA load for dual-band RF transceivers and MAC controller. Use Value: Prevents PSE port shutdown during capacitor charging; open-drain PG signals ready state to system supervisor MCU. |
| Security Cameras | POS Terminals |
Use Scenario: Outdoor IP camera with IR illumination powered remotely over extended Ethernet runs (up to 100 m). IC Role / Device Role / Timing Role: Provides Class 3 power negotiation, monitors RTN voltage for PG assertion, and enables thermal protection during summer ambient. Use Value: Ensures reliable startup despite 5–8 V cable drop; 100-V rating withstands induced surges on outdoor cabling. |
Use Scenario: Retail point-of-sale terminal integrating barcode scanner, display, and payment interface in compact enclosure. IC Role / Device Role / Timing Role: Delivers stable 450-mA supply to microcontroller and peripherals while supporting MPS for PSE supervision. Use Value: Eliminates separate power brick; low quiescent current (240–450 µA) extends uptime during standby modes. |
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 | Fixed UVLO thresholds (39.3 V rising / 30.5 V falling); no UVLO pin - thresholds internal to VDD path | Optimized for IEEE 802.3af-compliant PSEs only; lacks flexibility for legacy systems with lower output voltage | Select when design targets modern PSE infrastructure and simplifies layout by removing UVLO divider resistors |
| TPS2377D | Legacy UVLO thresholds (35.1 V rising / 30.5 V falling); smaller hysteresis (4.5 V) vs. TPS2376D (8.8 V) | Suitable for older PSEs with marginal 40–42 V output; higher risk of oscillation during slow-rising input voltage | Choose only if interoperability testing confirms stable startup with installed PSE hardware; not recommended for new designs |
Compared with TPS2375D and TPS2377D, the TPS2376D uniquely provides externally adjustable UVLO thresholds via dedicated pin - enabling one hardware design to support both legacy and standards-compliant PSEs without PCB revision or component change.
Availability
TPS2376D is available at Aetrix Electronics and suitable for VoIP phones, security cameras, WLAN access points, and POS terminals requiring stable component supply across industrial temperature range and long-life PoE deployments.
Supply support for TPS2376D 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 headquartered in Dallas, Texas, designing analog and embedded processing solutions for industrial, automotive, and communications markets.
The TPS237x family was developed specifically to simplify IEEE 802.3af Power over Ethernet powered device implementation, integrating detection, classification, UVLO, inrush control, and power-switching into compact 8-pin packages.
FAQ
What is the function of the UVLO pin on the TPS2376D?
The UVLO pin on the TPS2376D accepts an external resistor divider between VDD and VSS to set programmable upper and lower undervoltage lockout thresholds. Unlike the fixed-threshold TPS2375D and TPS2377D, this pin enables design flexibility for compatibility with both IEEE 802.3af-compliant and legacy PSEs. The TPS2376D datasheet specifies nominal rising threshold of 39.3 V and falling threshold of 30.5 V when configured per recommended divider values.
How does the TPS2376D implement inrush current limiting?
The TPS2376D uses the ILIM pin to accept a resistor (62.5–500 kΩ) from ILIM to VSS, setting the inrush current limit between 100–180 mA depending on resistance value. With R(ILIM) = 178 kΩ, typical inrush is 130 mA. This soft-start prevents input voltage sag during bulk capacitor charging and avoids PSE port shutdown. The ILIM pin must never be left open or shorted to VSS.
What is the role of the RTN pin in the TPS2376D?
The RTN pin on the TPS2376D serves as the switched low-side return path for the downstream load - it carries the controlled current (up to 515 mA) from the integrated 0.58-Ω MOSFET to the input of the DC/DC converter. RTN also acts as the reference for the PG output and is monitored by internal comparators for power-good assertion and current-limit detection.
Can the TPS2376D be used in Class 4 PoE applications?
No, the TPS2376D is designed strictly for IEEE 802.3af (Type 1) applications up to Class 3 (12.95 W at PD input). It does not support IEEE 802.3at (Type 2) or 802.3bt (Type 3/4) higher-power classes. Its classification current range (up to 41.2 mA with 255 Ω) and 450-mA operational current limit align only with 802.3af specifications. For higher power, TI's TPS2378 or TPS23880 series are required.
What is the purpose of the PG pin on the TPS2376D?
The PG (Power-Good) pin on the TPS2376D is an open-drain output referenced to RTN that signals valid power delivery. It enters high-impedance state only after successful detection, classification, exit from inrush limiting, and stable RTN voltage above 9.5 V. A pull-up resistor is required to interface with system supervisors or microcontrollers. PG deglitch time is 75–225 µs to reject noise-induced false assertions.
TPS2376D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- 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
TPS2376D FAQ
1.How can I place an order for TPS2376D through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS2376D 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 TPS2376D reliable?
The price and inventory of TPS2376D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS2376D is usually 5 days.
3.What payment methods are accepted for TPS2376D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS2376D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS2376D?
TPS2376D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS2376D 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 TPS2376D?
For technical support, including TPS2376D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS2376D requirements.
6.How does Aetrix verify that TPS2376D is sourced from the original manufacturer or authorized distributors?
All TPS2376D 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 TPS2376D meets industry standards.
7.What is the process for return or replacement of TPS2376D?
All TPS2376D units undergo pre-shipment inspection (PSI). If there is an issue with TPS2376D, 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 TPS2376D part is unused and in its original packaging.
Return procedure for TPS2376D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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