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Texas Instruments TPS23841PJD
- Part No.:
- TPS23841PJD
- Manufacturer:
- Texas Instruments
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 64-TQFP Exposed Pad
- Datasheet:
-
TPS23841PJD.pdf
- Description:
- IC POE CNTRL 4 CHANNEL 64HTQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,287
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Product details
Overview
TPS23841PJD from Texas Instruments is a quad-port IEEE 802.3af-compliant Power Sourcing Equipment (PSE) manager IC with integrated power switches and sense resistors, operating from 21.5 V to 57 V input, delivering up to 570 mA per port, featuring four 15-bit A/D converters for real-time voltage/current/die temperature monitoring, and supporting auto, semi-auto, and microcontroller-based power management modes - used in high-power Ethernet mid-spans and enterprise PoE switches.
For engineers reviewing the TPS23841PJD datasheet, TPS23841PJD pinout, TPS23841PJD application, or TPS23841PJD equivalent, this page delivers verified technical context, exact pin functions, confirmed operating modes (AM/SAM/PMM), measured current limits (ICUT = 615 mA, ILIM = 650 mA), thermal protection behavior, and I²C timing compliance (400 kHz), enabling accurate PoE system architecture decisions without cross-referencing external sources.
Technical Context
The TPS23841PJD implements a fully integrated PSE port controller with internal low-side MOSFETs and current-sense circuitry - eliminating external sense resistors and discrete switches per port. Its proprietary 15-bit integrating A/D converter rejects 60-Hz line noise and performs simultaneous four-channel measurements of signature resistance, port voltage, current, and die temperature.
It supports three distinct operational modes: Auto Mode (standalone discovery/classification/power delivery), Semi-Auto Mode (I²C-accessible status registers with limited control), and Power Management Mode (full register-level control via MSP430 or similar MCU). Internal supply rails (10 V, 6.3 V, 3.3 V, 2.5 V) are generated from V48 and brought out separately for optimal bypassing and noise isolation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Port count | Quad-port (4 independent IEEE 802.3af-compliant PSE channels) |
| Input voltage range | 21.5 V to 57 V on V48 pin - supports wide-range PoE mid-span and injector designs |
| Per-port current limit | ILIM = 650 mA nominal - enables up to 25 W per PD at 48 V with margin |
| A/D resolution | 15-bit integrating converter per port - provides precise, noise-immune measurement of PD resistance, voltage, current, and die temperature |
| I²C interface speed | 400 kHz maximum - compatible with standard fast-mode I²C controllers and opto-isolated implementations |
| Operating temperature | –40°C to +125°C junction - qualified for industrial and medical PoE infrastructure environments |
| UVLO threshold | VUVLO_R = 21.5 V rising - ensures reliable startup only when sufficient PoE input rail is present |
| Thermal protection | Over-temperature shutdown at TJ > 150°C - prevents damage during sustained overload or poor heatsinking |
Pinout & Package
The TPS23841PJD is housed in a 64-pin TQFP package with PowerPAD™ up (PJD) thermal construction - exposing the die paddle on the top surface for enhanced thermal transfer when mounted to a heatsink or thermal pad.
| 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 |
| P1–P4 (Pins 58, 55, 26, 23) | Port positive terminals | High-side 48-V sense inputs - connect directly to transformer center taps or PD return paths |
| N1–N4 (Pins 59, 54, 27, 22) | Port negative terminals | Low-side switched outputs - internal MOSFETs deliver controlled current to PDs |
| CINT1–CINT4 (Pins 61, 52, 29, 20) | A/D integration capacitor nodes | Connect 0.027 µF polycarbonate capacitors to RG for precision ramp-converter operation |
| SCL/SDA_I/SDA_O (Pins 40, 39, 38) | I²C interface | Open-drain SDA_O supports opto-coupled isolation; SCL supports 400 kHz timing |
| MS (Pin 2) | Mode select input | Pull-low for Auto Mode (standalone); pull-high for Power Management Mode (MCU-controlled) |
| INTB (Pin 45) | Fault indicator output | Active-low open-drain signal asserted on any port fault - latched until TED timer expires |
| RBIAS (Pin 10) | Bias current reference | 124 kΩ to RG sets internal clock, A/D timing, and bias currents - critical for IEEE 802.3af compliance |
Key Features
| Feature | Design Value |
|---|---|
| Integrated power switch per port | Eliminates two external components (MOSFET + sense resistor) per channel - reduces BOM cost and layout area |
| Four independent 15-bit A/D converters | Enables concurrent, high-resolution measurement of PD signature resistance, voltage, current, and die temperature - no external ADC required |
| Controlled current ramp-up/down | Reduces EMI during power application and removal - meets CISPR-22 Class B emission requirements in PoE systems |
| DC disconnect detection | Detects <10 mA load current to identify unplugged or failed PDs - enables automatic port recovery without MCU intervention |
| AC disconnect support | Drives external AC disconnect circuitry via AC_LO/AC_HI pins - allows legacy non-802.3af PD detection and safe hot-swap |
| PowerPAD™ up (PJD) package | Top-side thermal pad improves heat dissipation in constrained board spaces - enables higher continuous port current in compact designs |
Applications
| Enterprise Ethernet Switches | Medical PoE Infrastructure |
|---|---|
|
Use Scenario: 24-port managed switch delivering PoE to IP phones, wireless APs, and security cameras across office floors. IC Role / Device Role / Timing Role: Quad-port PSE manager handling four concurrent PoE channels per IC - coordinated via I²C to scale to full switch fabric. Use Value: Integrated A/D and auto-mode sequencing reduce firmware complexity and eliminate need for external current-sense amplifiers or discrete power switches per port. |
Use Scenario: DIN-rail mounted PoE injector powering ultrasound machines, patient monitors, and diagnostic imaging devices in hospital networks. IC Role / Device Role / Timing Role: High-reliability PSE manager operating at –40°C to +125°C junction - ensuring uninterrupted power delivery in critical care environments. Use Value: Over-temperature shutdown and DC disconnect detection prevent unsafe operation during cable faults or equipment disconnection - meeting IEC 60601-1 safety requirements. |
| Industrial Mid-Span Injectors | SOHO Hubs & Network Extenders |
|
Use Scenario: Outdoor-rated mid-span unit injecting PoE into existing CAT5e cabling to power remote sensors, PLC gateways, and ruggedized cameras. IC Role / Device Role / Timing Role: Wide-input (21.5–57 V) PSE manager surviving 100-V transients - operates reliably under variable DC supply conditions. Use Value: Internal UVLO hysteresis (0.2–2.0 V) and robust 15-bit A/D rejection of 60-Hz noise ensure stable operation in electrically noisy factory settings. |
Use Scenario: Compact desktop hub providing PoE to VoIP phones and smart lighting controllers in small offices or home networks. IC Role / Device Role / Timing Role: Low-cost quad-port PSE solution using Auto Mode - eliminates MCU and simplifies certification for FCC/CE compliance. Use Value: Single-chip implementation with integrated power switches reduces bill-of-materials by >8 components per port versus discrete solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Power Sourcing Equipment manager applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS23861PWR | Single-port PSE manager with identical 15-bit A/D architecture and 650 mA ILIM, but lacks quad-port integration and shared I²C bus control | Used where port density is lower and board space permits multiple single-port ICs instead of one quad-port device | Select when designing modular PSE cards or needing independent thermal management per port |
| MAX5984AEUI+ | Quad-port PSE with 600 mA ILIM, SPI interface (not I²C), and no integrated 10 V/6.3 V supplies - requires external LDOs | Targeted at cost-sensitive consumer-grade hubs where I²C compatibility and internal analog rails are not required | Select when leveraging existing SPI-based MCU infrastructure and accepting higher external component count |
Compared with TPS23841PJD, TPS23861PWR offers identical per-port accuracy and protection but requires four separate ICs and PCB area for quad functionality, while MAX5984AEUI+ trades I²C simplicity and integrated power rails for SPI flexibility and lower unit cost - making TPS23841PJD optimal for space-constrained, high-integration PoE infrastructure requiring deterministic timing and minimal external support components.
Availability
TPS23841PJD is available at Aetrix Electronics and suitable for enterprise Ethernet switches, medical PoE injectors, and industrial mid-span applications requiring stable component supply, long-term lifecycle assurance, and full IEEE 802.3af compliance verification.
Supply support for TPS23841PJD 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 over 40 years of leadership in power management and industrial communications ICs.
The TPS23841PJD belongs to TI's Power over Ethernet (PoE) PSE controller product line - designed specifically for high-density, high-reliability Ethernet infrastructure requiring integrated power switching, precision A/D monitoring, and multi-mode operational flexibility.
FAQ
What is the primary function of the TPS23841PJD in a PoE system?
The TPS23841PJD serves as a quad-port Power Sourcing Equipment (PSE) manager IC that autonomously discovers, classifies, and delivers power to IEEE 802.3af-compliant Powered Devices (PDs). It integrates power switches, current sensing, and four 15-bit A/D converters - enabling precise, noise-immune monitoring of port voltage, current, signature resistance, and die temperature without external components. The TPS23841PJD supports Auto, Semi-Auto, and Power Management Modes to suit standalone or MCU-controlled architectures.
Does the TPS23841PJD require external sense resistors for current measurement?
No, the TPS23841PJD does not require external sense resistors. Its internal low-side power switch architecture includes integrated current-sensing circuitry, eliminating the need for discrete shunt resistors per port. This design reduces component count, PCB area, and thermal drift errors - while maintaining ±5% current limit accuracy (ILIM = 650 mA nominal) across –40°C to +125°C. The TPS23841PJD achieves this via calibrated on-die sensing matched to its MOSFET RDS(on).
How does the TPS23841PJD handle thermal protection?
The TPS23841PJD incorporates dedicated thermal shutdown protection that triggers at junction temperature (TJ) exceeding 150°C. When activated, it disables all ports and holds them in a safe off-state until temperature falls below the hysteresis threshold. Die temperature is continuously measured via an on-chip sensor and reported through the 15-bit A/D converter - allowing host software to implement predictive thermal throttling before shutdown occurs. The PowerPAD™ up (PJD) package enhances thermal conduction to improve sustained power delivery reliability.
Can the TPS23841PJD support legacy (non-802.3af) PD detection?
Yes, the TPS23841PJD supports legacy PD detection in Power Management Mode (PMM) via programmable AC disconnect excitation using the AC_LO and AC_HI pins. In this mode, the IC can drive external circuitry to apply AC signals across the P/N pair and detect valid legacy PD signatures - such as 25-kΩ resistive loads - without requiring IEEE-compliant classification. This capability is disabled in Auto Mode and requires MCU control through the I²C interface to configure and initiate.
What is the significance of the "PJD" suffix in TPS23841PJD?
"PJD" denotes the 64-pin TQFP package variant with PowerPAD™ up orientation - where the thermally enhanced copper paddle is exposed on the top surface of the package rather than the bottom. This configuration allows direct thermal coupling to a heatsink or thermal pad mounted above the IC, improving heat dissipation in vertically constrained or airflow-limited PoE systems. It is functionally identical to the PAP (PowerPAD down) variant but optimized for top-side cooling - confirmed in TI's SLUS745A datasheet ordering table.
TPS23841PJD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 64-TQFP Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Active
- 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)
TPS23841PJD FAQ
1.How can I place an order for TPS23841PJD through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS23841PJD 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 TPS23841PJD reliable?
The price and inventory of TPS23841PJD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS23841PJD is usually 5 days.
3.What payment methods are accepted for TPS23841PJD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS23841PJD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS23841PJD?
TPS23841PJD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS23841PJD 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 TPS23841PJD?
For technical support, including TPS23841PJD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS23841PJD requirements.
6.How does Aetrix verify that TPS23841PJD is sourced from the original manufacturer or authorized distributors?
All TPS23841PJD 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 TPS23841PJD meets industry standards.
7.What is the process for return or replacement of TPS23841PJD?
All TPS23841PJD units undergo pre-shipment inspection (PSI). If there is an issue with TPS23841PJD, 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 TPS23841PJD part is unused and in its original packaging.
Return procedure for TPS23841PJD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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