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Texas Instruments TPS2377D-1
- Part No.:
- TPS2377D-1
- Manufacturer:
- Texas Instruments
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS2377D-1.pdf
- Description:
- IC POE CNTRL 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:450
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Product details
Overview
TPS2377D-1 from Texas Instruments is an IEEE 802.3af-compliant Powered Device (PD) controller in SOIC-8 package, implementing detection, classification, and undervoltage lockout for PoE-powered endpoints. It features a 0.58-Ω integrated low-side MOSFET switch, 450-mA fixed operational current limit, legacy UVLO thresholds (34.1 V turn-on / 30.5 V turn-off), and programmable inrush current control via external ILIM resistor. It is used in VoIP phones and security cameras requiring robust PoE interface with auto-retry fault recovery.
For engineers reviewing the TPS2377D-1 datasheet, TPS2377D-1 pinout, TPS2377D-1 application, or TPS2377D-1 equivalent, key selection considerations include legacy UVLO compatibility, open-drain power-good reporting, 100-V absolute maximum input rating, thermal shutdown at 135°C, and SOIC-8 package suitability for industrial Ethernet endpoint designs.
Technical Context
The TPS2377D-1 implements a state machine-driven PoE interface with three distinct operational phases: detection (1.4–11.3 V), classification (13–21 V), and powered operation (>34.1 V). Its internal comparators enforce legacy UVLO thresholds and classification current windows (e.g., 38–41.2 mA for Class 4), while the ILIM pin accepts 62.5–500 kΩ resistors to set inrush current between 100–180 mA.
It integrates a 100-V, 0.58-Ω low-side MOSFET pass device with 450-mA fixed current limiting and thermal shutdown at 135°C. The PG output is open-drain with 75–225 µs deglitching, referenced to RTN, and asserts only when RTN voltage exceeds 9.5 V and inrush has terminated - enabling reliable downstream DC/DC enable sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| UVLO Turn-On Threshold | 34.1 V (nominal); enables power delivery only after PSE stabilizes above legacy-compliant minimum |
| UVLO Turn-Off Threshold | 30.5 V (nominal); maintains operation during cable drop but disconnects load before brownout |
| Operational Current Limit | 450 mA (typical); protects internal MOSFET while allowing full 12.95 W PD power under IEEE 802.3af |
| Inrush Current Range | 100–180 mA (programmable via 62.5–500 kΩ ILIM resistor); prevents PSE false trip during bulk cap charging |
| Pass Device rDS(on) | 0.58 Ω (typical at 300 mA); minimizes conduction loss and self-heating in high-current PoE loads |
| Power-Good Threshold | 9.5 V (rising); ensures stable RTN rail before enabling downstream converters or PHYs |
| ESD Rating | 15-kV system-level (contact/air at RJ-45); meets IEC 61000-4-2 for rugged Ethernet port deployment |
Pinout & Package
TPS2377D-1 is housed in an 8-pin SOIC (D) package with standard 1.27-mm pitch and exposed pad not present. Pin 7 is NC; all other pins are electrically active per TI SLVS570A.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ILIM (Pin 1) | Inrush current programming input | Accepts resistor to VSS to set start-up inrush limit (100–180 mA); must not be left floating or shorted |
| CLASS (Pin 2) | Classification current sink | Sinks precise current (e.g., 39.4 mA for Class 4) to signal PD power class to PSE; requires 255 Ω ±1% resistor |
| DET (Pin 3) | Detection signature driver | Pulls RDET = 24.9 kΩ to VSS during detection (1.4–11.3 V) to generate 25-kΩ incremental resistance signature |
| VSS (Pin 4) | Input return reference | Source-side ground reference for internal circuitry and DET/CLASS/ILIM bias paths |
| RTN (Pin 5) | Switched load return | Low-side output rail for downstream circuits; carries full load current and serves as PG comparator reference |
| PG (Pin 6) | Open-drain power-good output | Asserts high-impedance when RTN > 9.5 V and inrush complete; requires external pullup for logic-level signaling |
| NC (Pin 7) | No connection | Not bonded; must remain unconnected on PCB |
| VDD (Pin 8) | Positive input supply | Connects to rectified PoE input (up to 57 V); supplies internal bias and monitors line voltage for UVLO decisions |
Key Features
| Feature | Design Value |
|---|---|
| Legacy UVLO thresholds | 34.1 V turn-on / 30.5 V turn-off enables interoperability with pre-802.3af PSEs operating below 44 V minimum |
| Auto-retry fault recovery | Resets current-limit latch after overcurrent event instead of latching off - critical for unattended VoIP endpoints |
| Integrated 100-V MOSFET | 0.58-Ω rDS(on) eliminates need for external pass transistor and reduces BOM count in space-constrained designs |
| Programmable inrush control | ILIM pin supports 62.5–500 kΩ resistor range to tune inrush for legacy PSEs or large hold-up capacitors |
| True open-drain PG output | PG referenced to RTN (not VSS) allows direct interfacing with downstream DC/DC enable inputs without level-shifting |
Applications
| VoIP Phones | WLAN Access Points |
|---|---|
Use Scenario: Powered via Cat5e Ethernet cable in enterprise office deployments with mixed PSE generations. IC Role / Device Role / Timing Role: PD controller managing detection, classification, and regulated power delivery to baseband processor and codec. Use Value: Legacy UVLO ensures reliable startup even with older Cisco midspans; auto-retry prevents call drops during transient overloads. |
Use Scenario: Wall-mounted dual-band APs drawing up to 12.95 W from PoE switches in retail environments. IC Role / Device Role / Timing Role: Primary power interface IC enabling hot-swap insertion and MPS maintenance for PSE supervision. Use Value: 0.58-Ω MOSFET minimizes heat rise in sealed enclosures; PG output directly enables 12-V DC/DC converter with no additional logic. |
| Security Cameras | POS Terminals |
Use Scenario: Outdoor IP cameras exposed to temperature extremes (-40°C to 85°C) and ESD events near RJ-45 ports. IC Role / Device Role / Timing Role: Robust PoE front-end providing fault-protected power and thermal shutdown at 135°C. Use Value: 15-kV system-level ESD rating eliminates need for external TVS diodes at Ethernet interface; wide temp range ensures reliability in unconditioned locations. |
Use Scenario: Compact countertop payment terminals requiring single-cable power + data in high-noise retail settings. IC Role / Device Role / Timing Role: Power management hub coordinating PoE input, battery backup switchover, and secure MCU supply. Use Value: Fixed 450-mA current limit guarantees compliance with PSE overload detection; PG assertion synchronizes secure boot sequence. |
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 | IEEE 802.3af-compliant UVLO (39.3 V turn-on / 30.5 V turn-off); same SOIC-8 package and pinout | Designed for modern PSEs meeting full 44 V minimum output; higher UVLO reduces risk of instability on slow-rising rails | Select TPS2375D-1 when deploying exclusively with certified 802.3af switches; avoid in mixed-legacy environments. |
| TPS2377PW-1 | Identical electrical specs and functionality; differs only in TSSOP-8 (PW) package with smaller footprint and thermal resistance | Better suited for space-constrained designs where SOIC-8 layout area or θJA (238°C/W) is limiting | Choose TPS2377PW-1 for new designs targeting higher density or improved thermal performance; verify reflow profile for TSSOP. |
Compared with TPS2375D-1, the TPS2377D-1 trades higher UVLO stability for broader legacy PSE compatibility; compared with TPS2377PW-1, it offers identical functionality in a more manufacturable SOIC package with established assembly yield.
Availability
TPS2377D-1 is available at Aetrix Electronics and suitable for VoIP phones, security cameras, and WLAN access points requiring stable component supply across industrial temperature ranges and multi-generation PoE infrastructure.
Supply support for TPS2377D-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 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 endpoints, delivering integrated detection, classification, and power-switching functionality in minimal footprint packages like the TPS2377D-1.
FAQ
What is the primary function of the TPS2377D-1 in a PoE system?
The TPS2377D-1 serves as a Powered Device (PD) controller that manages the full IEEE 802.3af handshake - including detection signature generation, power classification, undervoltage lockout, and controlled power delivery via its integrated MOSFET. It ensures safe, standards-compliant operation for devices like VoIP phones and security cameras drawing power over Ethernet cables. The TPS2377D-1 implements legacy UVLO thresholds optimized for interoperability with older PSE hardware.
How does the TPS2377D-1 differ from the TPS2375D-1?
The TPS2377D-1 uses legacy UVLO thresholds (34.1 V turn-on / 30.5 V turn-off) to ensure reliable startup with pre-802.3af PSEs, whereas the TPS2375D-1 uses full 802.3af thresholds (39.3 V / 30.5 V) for modern compliant switches. Both share identical pinout, package, current limits, and feature set. The TPS2377D-1 is preferred in mixed-infrastructure deployments where legacy midspans coexist with newer switches.
What is the role of the ILIM pin on the TPS2377D-1?
The ILIM pin on the TPS2377D-1 accepts an external resistor to ground to program the inrush current limit during power-up - adjustable from 100 mA to 180 mA using 62.5–500 kΩ resistors. This prevents the PSE from falsely detecting an overload during bulk capacitor charging. The TPS2377D-1 requires this resistor to be populated (not open or shorted) for proper operation and thermal safety.
Can the TPS2377D-1 be used with both Mode A and Mode B PoE power injection?
Yes, the TPS2377D-1 is fully compatible with both Mode A (power on data pairs) and Mode B (power on spare pairs) PoE delivery because it interfaces with the rectified output of the PD's input diode bridge - which inherently handles polarity insensitivity and path selection. The TPS2377D-1 operates solely on the resulting DC bus (VDD–VSS), making it agnostic to upstream PSE wiring configuration.
What does the PG output signal indicate on the TPS2377D-1?
The PG (Power-Good) output on the TPS2377D-1 is an open-drain signal that goes high-impedance only when the RTN rail voltage exceeds 9.5 V and the device has exited inrush current limiting - confirming stable, regulated power delivery to downstream circuitry. It is referenced to RTN (not VSS), enabling direct enable control of DC/DC converters without level-shifting. The TPS2377D-1 includes 75–225 µs deglitching to prevent false toggling during transients.
TPS2377D-1 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
TPS2377D-1 FAQ
1.How can I place an order for TPS2377D-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS2377D-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 TPS2377D-1 reliable?
The price and inventory of TPS2377D-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS2377D-1 is usually 5 days.
3.What payment methods are accepted for TPS2377D-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS2377D-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS2377D-1?
TPS2377D-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS2377D-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 TPS2377D-1?
For technical support, including TPS2377D-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS2377D-1 requirements.
6.How does Aetrix verify that TPS2377D-1 is sourced from the original manufacturer or authorized distributors?
All TPS2377D-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 TPS2377D-1 meets industry standards.
7.What is the process for return or replacement of TPS2377D-1?
All TPS2377D-1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS2377D-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 TPS2377D-1 part is unused and in its original packaging.
Return procedure for TPS2377D-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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