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Texas Instruments TPS2375PW-1
- Part No.:
- TPS2375PW-1
- Manufacturer:
- Texas Instruments
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS2375PW-1.pdf
- Description:
- IC POE CNTRL 1 CHANNEL 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,322
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Product details
Overview
TPS2375PW-1 from Texas Instruments is an IEEE 802.3af-compliant powered device (PD) controller IC for Power over Ethernet applications, integrating a 0.58-Ω 100-V low-side MOSFET switch, programmable inrush current control (via ILIM pin), fixed 450-mA operational current limit, and open-drain power-good (PG) reporting. It operates across –40°C to 85°C and supports Class 3 PD implementation in VoIP phones and WLAN access points.
For engineers reviewing the TPS2375PW-1 datasheet, TPS2375PW-1 pinout, TPS2375PW-1 application, or TPS2375PW-1 equivalent, key selection criteria include IEEE 802.3af UVLO thresholds (39.3 V rising / 30.5 V falling), TSSOP-8 package compatibility, inrush current programmability via external resistor (178 kΩ typical), and auto-retry fault recovery behavior after current-limit events.
Technical Context
The TPS2375PW-1 implements a state machine-driven PoE handshaking sequence-detection (2.7–10.1 V), classification (13–21 V), and powered operation-with dedicated comparators for DET, CLASS, and UVLO with hysteresis. Its internal 100-V MOSFET enables direct connection to PoE input diode bridges while tolerating up to 515 mA RTN sink current.
It features dual-stage current limiting: programmable inrush (100–180 mA, set by RILIM = 62.5–500 kΩ) followed by fixed 405–515 mA operational limit, plus thermal shutdown at 135°C with 20°C hysteresis. PG assertion requires RTN voltage ≥10 V and stable UVLO, with 75–225 µs deglitch timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IEEE Compliance | IEEE 802.3af-compliant PD controller with auto-retry fault recovery and MPS monitoring support. |
| UVLO Thresholds | 39.3 V (rising), 30.5 V (falling); ensures reliable turn-on/turn-off per PoE spec with 8.8 V hysteresis. |
| Inrush Current Limit | Programmable 100–180 mA via external RILIM; prevents PSE voltage sag during bulk capacitor charging. |
| Operational Current Limit | Fixed 405–515 mA; exceeds IEEE 400 mA max to allow full power draw while enabling PSE fault detection. |
| Pass Device rDS(on) | 0.58 Ω (typical) at 300 mA; minimizes conduction loss in low-side switch path feeding downstream DC/DC converter. |
| Power-Good Output | Open-drain PG with 10 V threshold rising edge and 0.4 V low-level output; signals valid RTN rail to system controller. |
| Operating Temperature | –40°C to +85°C ambient; validated for industrial-grade PoE endpoint deployment in uncontrolled environments. |
Pinout & Package
TSSOP-8 package (PW-8), 3.0 mm × 4.4 mm, 0.65 mm pitch, thermally enhanced with exposed pad (not electrically connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ILIM (Pin 1) | Inrush current programming input | Connects to VSS via resistor (62.5–500 kΩ) to set inrush limit; must not be left floating or shorted. |
| CLASS (Pin 2) | Classification current source | Sinks current through external RCLASS (e.g., 357 Ω for Class 3) during 13–21 V window to signal PD power class. |
| DET (Pin 3) | Detection signature generator | Pulls to VSS via RDET = 24.9 kΩ during detection (VVDD < 11.3 V) to present 25 kΩ incremental resistance to PSE. |
| VSS (Pin 4) | Input return reference | Source-side ground reference for internal circuitry; connects to PSE negative rail before diode bridge. |
| RTN (Pin 5) | Switched load return output | Low-side switched output rail; carries all load current (≤515 mA) and serves as PG comparator reference. |
| PG (Pin 6) | Open-drain power-good indicator | Asserts high-impedance when RTN ≥10 V and UVLO stable; requires external pullup for logic-level signaling. |
| NC (Pin 7) | No connection | Unbonded pin; must remain unconnected per TI design guidelines. |
| VDD (Pin 8) | Positive input supply | Accepts rectified PoE voltage (0–57 V); powers internal circuitry and provides UVLO sensing node. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 100-V low-side switch | 0.58-Ω rDS(on) enables direct interface to PoE input diode bridges without external FET or level-shifting. |
| Programmable inrush control | RILIM-based adjustment allows optimization for legacy PSEs or large bulk capacitors without redesign. |
| True open-drain PG output | Independent of VDD rail; referenced to RTN for accurate downstream power-rail validation under load. |
| Auto-retry fault recovery | Resets current-limit latch automatically after fault clears-avoids manual reset or power cycle in field deployments. |
| 15-kV system-level ESD protection | Validated per EN61000-4-2 at RJ-45 port; eliminates need for external TVS on data lines in many designs. |
Applications
| VoIP Phones | WLAN Access Points |
|---|---|
Use Scenario: Powered via Cat5e Ethernet cable in enterprise office environments with centralized PoE switches. 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 Class 3 (6.49–12.95 W) compliance and auto-retry recovery from transient overload. |
Use Scenario: Indoor wireless infrastructure requiring reliable remote powering with minimal heat dissipation. IC Role / Device Role / Timing Role: Controls power sequencing to RF transceivers and MAC controller; PG signal enables firmware-controlled power management. Use Value: Delivers stable 450-mA operational current limit and 100-mA programmable inrush to prevent PSE port shutdown during Wi-Fi beacon bursts. |
| Security Cameras | Internet Appliances |
Use Scenario: Outdoor IP cameras using passive PoE injectors with variable output voltage and limited inrush tolerance. IC Role / Device Role / Timing Role: Regulates startup current into imaging sensor and video encoder bulk capacitance; monitors RTN for brownout detection. Use Value: Adjustable RILIM (e.g., 178 kΩ) ensures compatibility with legacy 44-V PSEs while maintaining IEEE 802.3af detection integrity. |
Use Scenario: Smart home hubs connecting to PoE-enabled residential gateways with constrained thermal budgets. IC Role / Device Role / Timing Role: Provides isolated power-good signaling to microcontroller; integrates UVLO hysteresis to avoid oscillation near 30.5 V cutoff. Use Value: Industrial temperature range (–40°C to 85°C) and 135°C thermal shutdown ensure continuous operation in enclosed enclosures. |
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-1 | SOIC-8 package (D-8); identical electrical specs and pinout but larger footprint and higher θJA (238°C/W vs. 258.5°C/W). | Preferred where board space permits and reflow profile favors SOIC; less suitable for dense layouts or high-ambient thermal environments. | Select TPS2375D-1 only if TSSOP assembly capability is unavailable or thermal margin exceeds 15°C above TPS2375PW-1's rating. |
| TPS2377PW-1 | Legacy UVLO thresholds (35.1 V rising / 30.5 V falling); same pinout, package, and feature set but incompatible with strict 802.3af PSEs. | Required only for interoperability with pre-2003 PSE hardware lacking full 44-V minimum output compliance. | Choose TPS2377PW-1 exclusively for brownfield deployments with known legacy PSEs; avoid in new 802.3af-certified designs. |
Compared with TPS2375D-1, the TPS2375PW-1 offers superior thermal performance in space-constrained PoE endpoints, while TPS2377PW-1 trades IEEE compliance for backward compatibility-making the TPS2375PW-1 the default choice for new 802.3af designs requiring TSSOP packaging.
Availability
TPS2375PW-1 is available at Aetrix Electronics and suitable for VoIP phones, WLAN access points, security cameras, and Internet appliances requiring stable component supply with full IEEE 802.3af compliance and industrial temperature support.
Supply support for TPS2375PW-1 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 specializing in analog and embedded processing technologies, with leadership in power management and interface solutions.
The TPS2375 family delivers integrated PoE PD controllers optimized for cost-sensitive, space-constrained Ethernet endpoints requiring robust IEEE 802.3af compliance and field-proven reliability.
FAQ
What is the primary function of the TPS2375PW-1 in a Power over Ethernet system?
The TPS2375PW-1 serves as the IEEE 802.3af-compliant powered device (PD) controller, executing detection, classification, and inrush-limited power delivery to downstream loads. It integrates a 0.58-Ω 100-V low-side MOSFET switch, programmable inrush current control via the ILIM pin, fixed 450-mA operational current limit, and open-drain power-good (PG) reporting. The TPS2375PW-1 ensures safe, standards-compliant power-up while supporting Class 3 PD implementations in devices like VoIP phones and WLAN access points.
How does the TPS2375PW-1 implement IEEE 802.3af detection and classification?
The TPS2375PW-1 implements detection by pulling the DET pin to VSS through an external 24.9-kΩ resistor when VVDD is between 2.7 V and 10.1 V, presenting a 25-kΩ incremental resistance to the PSE. During classification (VVDD = 13–21 V), it sinks current through an external RCLASS (e.g., 357 Ω for Class 3) to signal power class. The TPS2375PW-1 disconnects both paths outside their respective voltage windows to minimize standby power. These functions are hardwired in silicon and require no firmware.
What is the purpose of the ILIM pin on the TPS2375PW-1, and how is it configured?
The ILIM pin on the TPS2375PW-1 sets the inrush current limit during startup by connecting an external resistor (RILIM) from ILIM to VSS. With RILIM = 178 kΩ, the TPS2375PW-1 limits inrush to 100–180 mA, preventing PSE voltage sag during bulk capacitor charging. Values between 62.5 kΩ and 500 kΩ are supported, and the pin must never be left floating or shorted to VSS. This configuration is critical for compatibility with legacy PSEs and large-output-capacitor designs.
Does the TPS2375PW-1 support auto-retry after a current-limit fault, and how does it behave?
Yes, the TPS2375PW-1 features auto-retry fault recovery: after triggering its fixed 405–515 mA operational current limit, it latches off the RTN output, then automatically resets and attempts restart once the fault condition clears. This eliminates the need for manual reset or power cycling in deployed systems. Unlike latch-only alternatives (e.g., TPS2376), this behavior ensures resilience against transient overloads such as DC/DC converter startup surges or short-duration cable faults.
What are the key differences between the TPS2375PW-1 and the TPS2377PW-1?
The TPS2375PW-1 uses IEEE 802.3af-compliant UVLO thresholds (39.3 V rising / 30.5 V falling), while the TPS2377PW-1 uses legacy thresholds (35.1 V rising / 30.5 V falling) for compatibility with older PSEs. Both share identical pinout, package, and feature set-including inrush control, PG output, and auto-retry-but the TPS2375PW-1 is required for full 802.3af certification. Using TPS2377PW-1 in new designs risks instability with compliant PSEs due to reduced hysteresis and lower turn-on voltage.
TPS2375PW-1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm 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-TSSOP
TPS2375PW-1 FAQ
1.How can I place an order for TPS2375PW-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS2375PW-1 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 TPS2375PW-1 reliable?
The price and inventory of TPS2375PW-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS2375PW-1 is usually 5 days.
3.What payment methods are accepted for TPS2375PW-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS2375PW-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS2375PW-1?
TPS2375PW-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS2375PW-1 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 TPS2375PW-1?
For technical support, including TPS2375PW-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS2375PW-1 requirements.
6.How does Aetrix verify that TPS2375PW-1 is sourced from the original manufacturer or authorized distributors?
All TPS2375PW-1 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 TPS2375PW-1 meets industry standards.
7.What is the process for return or replacement of TPS2375PW-1?
All TPS2375PW-1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS2375PW-1, 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 TPS2375PW-1 part is unused and in its original packaging.
Return procedure for TPS2375PW-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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