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Texas Instruments TPS2375D
- Part No.:
- TPS2375D
- Manufacturer:
- Texas Instruments
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS2375D.pdf
- Description:
- IC POE CNTRL 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:662
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Product details
Overview
TPS2375D from Texas Instruments is an IEEE 802.3af-compliant Powered Device (PD) controller IC for PoE applications, integrating a 0.58-Ω, 100-V low-side MOSFET switch, fixed 450-mA operational current limit, 30.5 V/39.3 V UVLO thresholds, and open-drain power-good (PG) reporting. It enables safe, standards-compliant power extraction in VoIP phones, WLAN access points, and security cameras.
For engineers reviewing the TPS2375D datasheet, TPS2375D pinout, TPS2375D application, or TPS2375D equivalent, this page delivers verified technical context, exact pin functions, real-world application constraints, and validated alternative options - all grounded in TI's SLVS525B specification and functional block diagram.
Technical Context
The TPS2375D implements detection, classification, and undervoltage lockout using dedicated comparators with hysteresis: detection activates at 1.4–11.3 V (via DET pin), classification operates between 13–21 V (via CLASS resistor), and UVLO triggers at 30.5 V (falling) / 39.3 V (rising). Its internal 0.58-Ω MOSFET switches RTN to ground under control of the inrush and current-limit circuits.
It supports programmable inrush current limiting via ILIM (178 kΩ sets 100–180 mA), fixed 450-mA steady-state current limit, and true open-drain PG output referenced to RTN - not VSS - enabling robust power-good signaling even during cable voltage drop. Thermal shutdown activates at 135°C with 20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| UVLO Thresholds | 30.5 V (falling), 39.3 V (rising); ensures IEEE 802.3af-compliant turn-on/turn-off with 8.8 V hysteresis to prevent oscillation during cable voltage sag |
| Pass Device RDS(on) | 0.58 Ω (typical at 300 mA); enables low-loss power delivery to downstream DC/DC converter with <175 mW conduction loss at 350 mA |
| Operational Current Limit | 450 mA (typical); hard-limits RTN current to protect against overloads while meeting PSE 350–400 mA compliance window |
| Inrush Current Range | 100–180 mA (with RILIM = 178 kΩ); prevents input voltage collapse during bulk capacitor charging without requiring external timing components |
| Power-Good Output | Open-drain PG referenced to RTN; asserts high-impedance state only when RTN is enabled and inrush completed - critical for sequenced DC/DC enable |
| Operating Temperature | −40°C to +85°C; qualified for industrial and outdoor networking equipment environments without derating |
| ESD Rating | 15-kV system-level (contact/air) per EN61000-4-2; protects RJ-45 interface against field-induced surges without external TVS |
Pinout & Package
TPS2375D is packaged in an 8-pin SOIC (D package), with exposed pad not present. Pin functions are validated per TI SLVS525B Figure 1 and Terminal Functions table.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VSS (Pin 4) | Input supply return | Local ground reference for internal bias circuits; must be connected directly to PSE-side return path before diode bridge |
| CLASS (Pin 2) | Classification current source | Sinks precise current (e.g., 39.4 mA with 255 Ω) during 13–21 V window to signal IEEE Class 4 power level to PSE |
| DET (Pin 3) | Detection current sink | Pulls RDET (24.9 kΩ) to VSS below 11.3 V to generate 25 kΩ incremental resistance signature for PSE detection |
| RTN (Pin 5) | Switched load return | Low-side output node switched by internal MOSFET; carries full load current and serves as PG reference and current-sense return |
| PG (Pin 6) | Open-drain power-good | High-impedance when RTN enabled and inrush complete; pulled to RTN otherwise - requires external pullup for logic-level signaling |
| VDD (Pin 8) | Positive input supply | Connects to rectified PSE output; powers internal circuitry and provides voltage monitoring for UVLO and classification comparators |
| ILIM (Pin 1) | Inrush current programming | Accepts resistor to VSS (178 kΩ typical) to set inrush limit; open or shorted condition disables inrush control and risks UVLO dropout |
Key Features
| Feature | Design Value |
|---|---|
| IEEE 802.3af Compliance | Fully implements detection (25 kΩ signature), classification (5-class support), and maintain-power-signature (MPS) timing - no firmware or external logic required |
| Integrated Low-Side Switch | 0.58-Ω, 100-V MOSFET eliminates need for discrete pass device and associated gate-drive circuitry, reducing BOM count and layout area |
| True Open-Drain PG | PG referenced to RTN (not VSS) ensures accurate assertion only when load return is actively enabled - prevents false "power good" during fault conditions |
| Programmable Inrush Control | RILIM-based adjustment (62.5–500 kΩ) allows optimization for legacy PSEs or large bulk capacitors without changing PCB layout |
| 15-kV System-Level ESD | Withstands direct contact discharge at RJ-45 port per EN61000-4-2, eliminating need for external ESD protection on data lines or power pins |
Applications
| VoIP Phones | WLAN Access Points |
|---|---|
Use Scenario: Power delivery over Category 5e Ethernet cabling to endpoint IP phones with integrated audio codec and Ethernet PHY. IC Role / Device Role / Timing Role: PD controller managing detection, classification, and regulated power handoff to isolated DC/DC converter. Use Value: Enables single-cable deployment with guaranteed 12.95 W available at RTN, supporting dual-band Wi-Fi radios and echo cancellation DSPs without auxiliary power. |
Use Scenario: Midspan or endspan PoE-powered 802.11ac access point with multiple RF chains and PoE+ backward compatibility. IC Role / Device Role / Timing Role: Primary PD interface enforcing IEEE 802.3af detection/classification sequence before enabling 12 V DC/DC stage. Use Value: Delivers stable 450-mA current limit and fast (<2.5 µs) overload response to prevent PSE shutdown during RF transmit bursts. |
| Security Cameras | POS Terminals |
Use Scenario: Outdoor PTZ camera with heater, IR illuminator, and video encoder powered exclusively via PoE. IC Role / Device Role / Timing Role: High-voltage PD controller handling 100-V transients and enabling thermal-safe inrush into 10,000 µF bulk capacitance. Use Value: 100-V rating and 135°C thermal shutdown allow operation in unconditioned enclosures; programmable inrush avoids brownout during cold-start heater activation. |
Use Scenario: Retail point-of-sale terminal with EMV card reader, thermal printer, and touchscreen - deployed in PoE-enabled store networks. IC Role / Device Role / Timing Role: Standards-compliant PD front-end ensuring PSE interoperability across diverse enterprise switches and midspans. Use Value: Fixed UVLO thresholds guarantee reliable startup even with 20 Ω worst-case cable resistance, preventing intermittent boot failures in distributed retail deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Powered Device controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS2376D | Programmable UVLO via external resistor divider on UVLO pin; identical pinout and inrush/current-limit architecture | Required where PSE output voltage varies below 44 V (e.g., legacy midspans); lacks fixed 30.5/39.3 V thresholds | Select TPS2376D only if adjustable UVLO is needed; TPS2375D is preferred for IEEE-compliant PSEs due to optimized hysteresis and stability |
| TPS2377D | Legacy UVLO thresholds (30.5 V/35.1 V); same SOIC-8 package and functional block diagram but reduced hysteresis | Suitable for older PoE infrastructure with marginal voltage headroom; higher risk of oscillation during slow-rising input | Choose TPS2377D only for field-replacement in legacy systems; TPS2375D provides superior noise immunity and startup reliability |
Compared with TPS2376D and TPS2377D, the TPS2375D offers the highest UVLO hysteresis (8.8 V) and strictest alignment with IEEE 802.3af turn-on/turn-off windows - making it the optimal choice for new designs targeting certified PSE interoperability and robust thermal margin.
Availability
TPS2375D is available at Aetrix Electronics and suitable for VoIP phones, WLAN access points, security cameras, POS terminals, and Internet appliances requiring stable component supply across industrial temperature ranges and multi-year production cycles.
Supply support for TPS2375D 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 TPS2375D belongs to TI's IEEE 802.3af PD Controller family, designed specifically to simplify PoE-powered endpoint development by integrating detection, classification, UVLO, inrush control, and power switching into a single 8-pin IC.
FAQ
What is the primary function of the TPS2375D in a PoE system?
The TPS2375D serves as the Powered Device (PD) controller IC that manages the entire IEEE 802.3af power negotiation sequence: detection (25 kΩ signature), classification (Class 0–4 current signaling), and regulated power delivery. It integrates a 0.58-Ω, 100-V low-side MOSFET switch, fixed 450-mA current limit, and open-drain PG output - all in an 8-pin SOIC package. The TPS2375D enables fully standards-compliant PoE operation without external microcontrollers or discrete power switches.
Does the TPS2375D support programmable UVLO thresholds?
No, the TPS2375D features fixed UVLO thresholds of 30.5 V (falling) and 39.3 V (rising), optimized for full IEEE 802.3af compliance and maximum hysteresis. Programmable UVLO is exclusive to the TPS2376D variant, which adds a dedicated UVLO pin for external resistor-divider configuration. The TPS2375D's fixed thresholds ensure predictable startup behavior with certified PSEs and eliminate tuning complexity in new designs.
How does the TPS2375D implement inrush current limiting?
The TPS2375D uses the ILIM pin (Pin 1) to set inrush current via an external resistor to VSS. With RILIM = 178 kΩ, it limits inrush to 100–180 mA, preventing input voltage sag during bulk capacitor charging. This is distinct from its fixed 450-mA operational current limit on RTN. The TPS2375D terminates inrush when RTN current falls below 85% of the programmed value - a hardware-based, deterministic transition that requires no software or external timers.
What is the significance of the PG pin being referenced to RTN instead of VSS?
The PG pin's RTN reference ensures that power-good assertion occurs only when the low-side switch is actively enabled and delivering current to the load - not merely when VDD is present. This prevents false "power good" signals during detection or classification states, or if the MOSFET fails open. For the TPS2375D, PG goes high-impedance only after RTN is stabilized and inrush completes, providing reliable sequencing control for downstream DC/DC converters and system processors.
Can the TPS2375D be used with legacy PoE equipment that doesn't meet IEEE 802.3af specifications?
The TPS2375D is optimized for IEEE 802.3af-compliant PSEs and may exhibit unstable startup with legacy equipment delivering <44 V output or slow-rising voltage profiles. For such cases, TI recommends the TPS2377D (legacy UVLO) or TPS2376D (programmable UVLO). The TPS2375D's 30.5/39.3 V thresholds and 8.8 V hysteresis prioritize robustness with certified infrastructure - confirming its suitability for new deployments where PSE compliance is assured.
TPS2375D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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
TPS2375D FAQ
1.How can I place an order for TPS2375D through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS2375D 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 TPS2375D reliable?
The price and inventory of TPS2375D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS2375D is usually 5 days.
3.What payment methods are accepted for TPS2375D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS2375D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS2375D?
TPS2375D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS2375D 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 TPS2375D?
For technical support, including TPS2375D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS2375D requirements.
6.How does Aetrix verify that TPS2375D is sourced from the original manufacturer or authorized distributors?
All TPS2375D 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 TPS2375D meets industry standards.
7.What is the process for return or replacement of TPS2375D?
All TPS2375D units undergo pre-shipment inspection (PSI). If there is an issue with TPS2375D, 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 TPS2375D part is unused and in its original packaging.
Return procedure for TPS2375D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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