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Texas Instruments TPS23841PJDG4
- Part No.:
- TPS23841PJDG4
- Manufacturer:
- Texas Instruments
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 64-TQFP Exposed Pad
- Datasheet:
-
TPS23841PJDG4.pdf
- Description:
- IC POE CNTRL 4 CHANNEL 64HTQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,310
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Product details
Overview
TPS23841PJDG4 from Texas Instruments is a quad-port Power Sourcing Equipment (PSE) manager IC for IEEE 802.3af-compliant PoE systems, integrating MOSFET switches and sense resistors per port, supporting up to 570 mA/port at 21.5–57 V input, with 15-bit A/D converters for voltage/current/die temperature measurement, and operating across –40°C to +125°C. It enables high-power mid-spans and enterprise Ethernet switches delivering up to 25 W per PD.
For engineers reviewing the TPS23841PJDG4 datasheet, TPS23841PJDG4 pinout, TPS23841PJDG4 application, or TPS23841PJDG4 equivalent, key selection considerations include its quad-port integrated power switch architecture, 400-kHz I²C interface with 31 address options, auto/semi-auto/power management modes, DC disconnect detection, and thermal protection - all critical for robust, scalable PoE infrastructure design.
Technical Context
The TPS23841PJDG4 implements a fully autonomous discovery-classification-delivery sequence in Auto Mode, using dual low-voltage probe signals (4.4 V and 8.8 V) for accurate signature resistance measurement while avoiding damage to non-compliant devices. Its proprietary 15-bit integrating A/D converter rejects 60-Hz line noise to ensure reliable real-time current/voltage monitoring during powered operation.
It features three internally regulated supply rails (10 V, 6.3 V, 3.3 V) derived from the 48-V input, each brought out separately for optimal bypassing; the 3.3-V digital rail supports up to 2 mA external load. The device supports isolated microcontroller interfacing via optocoupled I²C and offers configurable fault response including UV/OV lockout (42.7 V / 55 V thresholds), overcurrent cutoff (615 mA typ), and DC disconnect detection (7.5–10 mA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Ports | Quad independent Ethernet PSE ports with integrated low-side power switches and current sensing |
| Input Voltage Range | 21.5 V to 57 V - supports wide-range PoE mid-span and injector designs with 100-V transient tolerance |
| Per-Port Current Limit | 650 mA nominal - enables up to 25 W per PD at 48 V (IEEE 802.3af Class 4 compliant) |
| A/D Resolution | 15-bit per port - provides high-precision real-time measurement of port voltage, current, and die temperature |
| I²C Interface | 400 kHz Fast Mode - allows host control with 31 selectable addresses (A1–A5) and opto-isolation support |
| Operating Temperature | –40°C to +125°C junction - qualified for industrial and medical PoE applications requiring extended thermal margin |
| UV/OV Thresholds | 42.7 V (UV), 55 V (OV) - programmable fault detection with 2–5 ms timer-based shutdown to protect PDs |
Pinout & Package
The TPS23841PJDG4 is housed in a 64-pin TQFP PowerPAD™ package with exposed thermal pad on top (PJD = PowerPAD up). This thermally enhanced layout enables efficient heat dissipation in high-current PoE applications, with θJA = 21.47°C/W under recommended 2-oz copper PCB layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V48 (Pin 5) | Primary power input | Accepts 21.5–57 V PoE supply; requires local 0.1-µF decoupling to AG1 for stable operation |
| P1–P4 (Pins 58,55,26,23) | Port positive terminals | High-side 48-V sense inputs per port; support differential voltage control with corresponding N pins |
| N1–N4 (Pins 59,54,27,22) | Port negative terminals | Low-side switched outputs with integrated current limiting; no external sense resistor required |
| CINT1–CINT4 (Pins 61,52,29,20) | A/D integration capacitor nodes | Connect 0.027-µF precision capacitor to RG for accurate 15-bit ramp-converter measurements |
| SCL/SDA_I/SDA_O (Pins 40,39,38) | I²C interface | Supports isolated communication: SDA_O is open-drain for direct optocoupler drive |
| MS (Pin 2) | Mode select | Logic low = Auto Mode (standalone); logic high = Power Management Mode (microcontroller-controlled) |
| INTB (Pin 45) | Fault indicator | Open-drain active-low output asserting on any port fault (UV/OV, OC, DC disconnect, thermal) |
Key Features
| Feature | Design Value |
|---|---|
| Integrated power switches | Eliminates 8 external MOSFETs and 4 sense resistors - reduces BOM count and PCB area in quad-port designs |
| Four 15-bit A/D converters | Enables simultaneous real-time monitoring of port voltage, current, and die temperature without external ADCs |
| Controlled current ramp | Reduces EMI during power-up/down by limiting di/dt - critical for meeting EMC requirements in dense switch chassis |
| Three operational modes | Auto (standalone), Semi-Auto (I²C read-only status + limited control), PMM (full register-based power management) |
| AC Disconnect support | Drives external AC bridge via AC_LO/AC_HI pins to detect legacy PDs using AC impedance signature |
| PowerPAD™ thermal package | Top-side thermal pad improves heat transfer to heatsink or copper plane - essential for sustained 570 mA/port operation |
Applications
| Enterprise Ethernet Switch | Medical PoE Endpoint |
|---|---|
Use Scenario: 24-port managed switch powering VoIP phones, wireless APs, and IP cameras over CAT5e/6 cabling. IC Role / Device Role / Timing Role: Quad-port PSE manager handling discovery, classification, and power delivery for four concurrent PoE links; coordinates with system MCU via I²C. Use Value: Enables compact, thermally efficient multi-port PSE design with precise per-port current limiting (650 mA) and real-time telemetry for dynamic power budgeting. | Use Scenario: Bedside patient monitor receiving power and data over single Ethernet cable in hospital ICU environment. IC Role / Device Role / Timing Role: PSE controller ensuring IEEE 802.3af compliance and safe power delivery to Class 3/4 medical PDs with strict thermal and fault-response requirements. Use Value: Supports –40°C to +125°C operation and overtemperature shutdown (TSD) to maintain safety-critical reliability in unventilated enclosures. |
| Industrial Mid-Span Injector | SOHO Network Hub |
Use Scenario: DIN-rail mounted 4-port PoE injector adding power capability to existing non-PoE network infrastructure in factory automation. IC Role / Device Role / Timing Role: Standalone PSE manager operating in Auto Mode to autonomously detect and power legacy and IEEE-compliant PDs without host processor. Use Value: Delivers up to 25 W per port with integrated DC disconnect detection (7.5–10 mA threshold) to maintain link integrity during cable faults or PD removal. | Use Scenario: Compact desktop Ethernet hub for small office/home office connecting IP phones and security cameras. IC Role / Device Role / Timing Role: Low-cost quad-port PSE core enabling plug-and-play PoE functionality with minimal external components. Use Value: Reduces bill-of-materials via integrated switches/sense elements and supports legacy PD detection - lowering entry barrier for cost-sensitive deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PSE manager applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS23841PAPR | Same die, 64-pin TQFP PowerPAD down (PAP) package - thermal pad on bottom instead of top | Requires bottom-side thermal interface; less suitable for top-side heatsinking or stacked layouts | Select PAPR when PCB layout uses thermal vias to internal ground planes and bottom-side cooling is preferred |
| TPS23861PWR | Single-port PSE manager with identical feature set, 20-pin TSSOP, lower quiescent current (3.5 mA vs 9 mA) | Not scalable to quad-port; used in modular or distributed PSE architectures rather than integrated switch solutions | Choose TPS23861PWR for space-constrained single-port injectors or where board-level modularity is prioritized over integration density |
Compared with TPS23841PJDG4, the PAPR variant offers identical electrical performance but different thermal path orientation, while the TPS23861PWR trades port count for smaller footprint and lower idle power - making it suitable for discrete, non-integrated PoE implementations where quad-port consolidation is unnecessary.
Availability
TPS23841PJDG4 is available at Aetrix Electronics and suitable for enterprise Ethernet switches, medical PoE endpoints, industrial mid-span injectors, SOHO hubs, and high-power PSE injectors requiring stable component supply and long-term lifecycle support.
Supply support for TPS23841PJDG4 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 communications ICs.
The TPS23841 product line delivers highly integrated, thermally robust Power Sourcing Equipment managers designed specifically for scalable, standards-compliant PoE infrastructure - targeting enterprise networking, medical devices, and industrial automation where reliability and multi-port efficiency are critical.
FAQ
What is the maximum continuous current per port supported by the TPS23841PJDG4?
The TPS23841PJDG4 supports a nominal per-port output current limit of 650 mA, with a typical overcurrent trip threshold (ICUT) of 615 mA and a hard current limit (ILIM) of 700 mA. This enables delivery of up to 25 W per port at 48 V, satisfying IEEE 802.3af Class 4 requirements. The device sustains this current across its full operating temperature range of –40°C to +125°C when implemented with proper thermal design using the PowerPAD™ package.
Does the TPS23841PJDG4 require external sense resistors for current monitoring?
No, the TPS23841PJDG4 does not require external sense resistors for current monitoring or current limiting. Its integrated low-side power switches include internal current sensing circuitry, eliminating the need for four external sense resistors in a quad-port design. This integration reduces component count, PCB area, and potential measurement errors associated with external resistor tolerances and layout parasitics - a key advantage confirmed in the device's functional description and terminal functions table.
How does the TPS23841PJDG4 handle legacy (non-IEEE) Powered Devices?
The TPS23841PJDG4 supports legacy PD detection through its AC Disconnect feature, using dedicated AC_LO and AC_HI output pins to drive an external AC bridge circuit. It measures AC impedance signatures to identify non-802.3af devices, and includes a dedicated legacy current limit of 3.5 mA (typical). This capability is enabled in Power Management Mode (PMM) via I²C register control and is documented in both the Electrical Characteristics and Functional Description sections of the datasheet.
What are the key differences between Auto Mode and Power Management Mode on the TPS23841PJDG4?
In Auto Mode (MS pin low), the TPS23841PJDG4 performs fully autonomous discovery, classification, and power delivery without host intervention. In Power Management Mode (MS pin high), all port operations are controlled via I²C registers - enabling advanced functions like legacy PD detection, AC disconnect, real-time telemetry access, and custom power sequencing. The datasheet confirms that Auto Mode disables write access to most control bits, while PMM unlocks full read/write register access for system-level optimization.
Can the TPS23841PJDG4 be used in thermally constrained applications?
Yes, the TPS23841PJDG4 is specifically engineered for thermally demanding environments, featuring a 64-pin PowerPAD™ package with top-side thermal pad (PJD variant), junction-to-ambient thermal resistance of 21.47°C/W, and guaranteed operation up to +125°C. Its integrated power switches operate in full enhancement mode to minimize conduction losses, and the device includes overtemperature protection that shuts down affected ports if die temperature exceeds safe limits - all verified in the Absolute Maximum Ratings and Thermal Resistance tables.
TPS23841PJDG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 64-TQFP Exposed Pad
- Packaging:
- Tray
- Product Status:
- Discontinued at Digi-Key
- Type:
- Controller (PSE)
- Number of Channels:
- 4
- Power - Max:
- 25 W
- Internal Switch(s):
- Yes
- Auxiliary Sense:
- No
- Standards:
- 802.3af (PoE)
- Voltage - Supply:
- 21.5V ~ 57V
- Current - Supply:
- 10mA
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-HTQFP (10x10)
TPS23841PJDG4 FAQ
1.How can I place an order for TPS23841PJDG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS23841PJDG4 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 TPS23841PJDG4 reliable?
The price and inventory of TPS23841PJDG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS23841PJDG4 is usually 5 days.
3.What payment methods are accepted for TPS23841PJDG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS23841PJDG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS23841PJDG4?
TPS23841PJDG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS23841PJDG4 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 TPS23841PJDG4?
For technical support, including TPS23841PJDG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS23841PJDG4 requirements.
6.How does Aetrix verify that TPS23841PJDG4 is sourced from the original manufacturer or authorized distributors?
All TPS23841PJDG4 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 TPS23841PJDG4 meets industry standards.
7.What is the process for return or replacement of TPS23841PJDG4?
All TPS23841PJDG4 units undergo pre-shipment inspection (PSI). If there is an issue with TPS23841PJDG4, 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 TPS23841PJDG4 part is unused and in its original packaging.
Return procedure for TPS23841PJDG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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