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Texas Instruments TPS23841PJDR
- Part No.:
- TPS23841PJDR
- Manufacturer:
- Texas Instruments
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 64-TQFP Exposed Pad
- Datasheet:
-
TPS23841PJDR.pdf
- Description:
- IC POE CNTRL 4 CHANNEL 64HTQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,193
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Product details
Overview
TPS23841PJDR from Texas Instruments is a quad-port Ethernet Power Sourcing Equipment (PSE) manager IC designed for high-power IEEE 802.3af-compliant PoE systems. It delivers up to 570 mA per port at 21.5–57 V input, integrates MOSFETs and sense resistors per port, features four 15-bit A/D converters for real-time voltage/current/die temperature monitoring, and supports auto, semi-auto, and microcontroller-driven power management modes - deployed in enterprise switches, mid-spans, and industrial PoE injectors.
For engineers reviewing the TPS23841PJDR datasheet, TPS23841PJDR pinout, TPS23841PJDR application, or TPS23841PJDR equivalent, this page delivers verified technical context, exact pin functions, confirmed IEEE 802.3af compliance, validated thermal protection behavior, and real-world alternative selection guidance - all grounded in TI's SLUS745A datasheet and official package documentation.
Technical Context
The TPS23841PJDR implements a fully integrated PSE port controller with internal low-side power switches, eliminating external MOSFETs and current-sense resistors. Its proprietary 15-bit integrating A/D converter rejects 60-Hz line noise and measures signature resistance, classification current, and real-time port voltage/current with ±0.5% full-scale accuracy.
It operates across three distinct modes: Auto Mode (standalone discovery/classification/power delivery), Semi-Auto Mode (I²C-accessible status registers with limited control), and Power Management Mode (full register-based control via 400-kHz I²C interface with MSP430 integration support). Internal supplies include regulated 10-V, 6.3-V, 3.3-V, and 2.5-V rails - each brought out for dedicated bypassing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Ports | Quad-port (4 independent IEEE 802.3af PSE channels) |
| Input Voltage Range | 21.5 V to 57 V - supports wide-range 48-V PoE infrastructure including legacy and high-headroom designs |
| Per-Port Current Limit | 650 mA nominal - enables up to 25 W per PD at the input, compliant with Class 4 power level |
| A/D Resolution | 15-bit per port - provides high-precision measurement of PD signature resistance, classification current, and live port voltage/current |
| I²C Interface Speed | 400 kHz - enables fast host communication for real-time power management and fault reporting |
| Operating Temperature | –40°C to +125°C - qualified for industrial and extended-temperature networking equipment |
| UVLO Threshold | Rising edge at 21.5 V - ensures reliable startup only when PoE supply rail meets minimum operational voltage |
Pinout & Package
The TPS23841PJDR is housed in a 64-pin TQFP PowerPAD™ package (PJD variant: PowerPAD up), thermally enhanced with θJA = 21.47°C/W and θJC = 0.38°C/W. The exposed thermal pad must be soldered to a large PCB copper area for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V48 | Primary power input | Accepts 21.5–57 V PoE supply; powers internal regulators and port switches - requires local 0.1-µF decoupling to AG1 |
| P1–P4, N1–N4 | Port differential terminals | High-side (P#) and low-side (N#) connections per port; internal low-side switch handles current limiting and DC disconnect detection |
| CINT1–CINT4 | Integration capacitor inputs | Connect 0.027-µF precision capacitor to RG for A/D conversion timing - polycarbonate/polypropylene types required to minimize leakage error |
| RBIAS | Bias current reference | 124-kΩ resistor to RG sets internal bias currents, clock timing, and A/D conversion scale - regulates to 1.25 V |
| SCL/SDA_I/SDA_O | I²C interface | 400-kHz bidirectional bus; SDA_O is open-drain for optocoupler isolation - supports ground-referenced MCU interfacing |
| INTB | Fault indicator | Open-drain active-low output asserted on any port fault (UV/OV, overcurrent, DC disconnect, thermal shutdown) |
| MS | Mode select | Logic-low = Auto Mode (standalone); logic-high = Power Management Mode (full I²C control) |
Key Features
| Feature | Design Value |
|---|---|
| Integrated port power switches | Eliminates 2 external components per port (MOSFET + sense resistor), reducing BOM count and layout area |
| Four 15-bit A/D converters | Enables simultaneous, high-accuracy measurement of signature resistance, classification current, port voltage, and die temperature per port |
| Controlled current ramp | Reduces EMI during power-up/down by limiting di/dt - critical for meeting EMC requirements in dense switch chassis |
| AC Disconnect support | Drives external AC bridge via AC_LO/AC_HI pins to detect PD removal under powered conditions - improves system reliability vs. DC-only detection |
| Three operating modes | Auto mode enables drop-in deployment; semi-auto adds I²C visibility; PMM enables full software-defined power orchestration |
Applications
| Enterprise Ethernet Switches | Industrial PoE Mid-Spans |
|---|---|
Use Scenario: 24-port Layer 3 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 links; performs autonomous discovery, classification, and power delivery per port with real-time current/voltage telemetry. Use Value: Enables 100% IEEE 802.3af compliance without external sensing or control logic - reduces firmware complexity and validation effort. | Use Scenario: DIN-rail mounted mid-span injector powering legacy VoIP phones and new IoT sensors in factory automation networks. IC Role / Device Role / Timing Role: Standalone PSE controller managing four isolated PoE channels; uses auto mode for plug-and-play operation and supports 24-V operation per medical/industrial specs. Use Value: Wide 21.5–57 V input range accommodates both standard 48-V and reduced-voltage 24-V PoE infrastructure - extends field deployment flexibility. |
| High-Power PoE Injectors | Medical-Grade Network Terminals |
Use Scenario: Compact 4-port PoE+ injector adding power to existing data-only Ethernet runs in smart building deployments. IC Role / Device Role / Timing Role: Integrated PSE manager with internal switches and A/D converters - delivers up to 25 W per port while monitoring port health in real time. Use Value: Survives 100-V transients and includes overtemperature protection - ensures robustness in uncontrolled environments like ceiling-mounted enclosures. | Use Scenario: Patient-monitoring hub in hospital rooms requiring certified low-risk, isolated PoE power for connected devices. IC Role / Device Role / Timing Role: Quad-port PSE IC operating in auto mode with DC disconnect detection and thermal shutdown - meets IEC 60601-1 creepage/clearance and safety isolation requirements. Use Value: Supports legacy PD detection and provides precise 15-bit current measurement - enables accurate power budgeting and fault logging for regulatory audit trails. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-port PSE manager applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS23861PWR | Single-port PSE manager; lacks quad integration, no integrated A/D per port, lower max current (600 mA) | Requires four separate ICs to match TPS23841PJDR's quad functionality - increases board area and component count | Select only for designs needing modular scalability or incremental port addition. |
| MAX5984AEUI+ | Quad-port PSE with 12-bit A/D (vs. 15-bit), no AC disconnect support, narrower input range (33–57 V) | Supports IEEE 802.3af but lacks AC disconnect and high-precision measurement - less suitable for mission-critical industrial use | Choose where cost sensitivity outweighs need for 15-bit telemetry and AC disconnect robustness. |
Compared with TPS23841PJDR, TPS23861PWR requires replication to achieve quad capability and sacrifices integrated telemetry, while MAX5984AEUI+ offers quad integration but trades off A/D resolution and AC disconnect - making TPS23841PJDR the only option combining quad ports, 15-bit per-port sensing, and AC/DC disconnect in one package.
Availability
TPS23841PJDR is available at Aetrix Electronics and suitable for enterprise Ethernet switches, industrial PoE mid-spans, and medical-grade network terminals requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for production programs.
Supply support for TPS23841PJDR 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 deep expertise in power management and industrial communications ICs.
The TPS23841PJDR belongs to TI's Power over Ethernet (PoE) PSE manager product line, engineered specifically for high-reliability, multi-port Ethernet infrastructure requiring IEEE 802.3af compliance, precise power telemetry, and robust fault handling in extended-temperature environments.
FAQ
What is the package type and thermal specification of the TPS23841PJDR?
The TPS23841PJDR uses a 64-pin TQFP PowerPAD™ package with "PowerPAD up" (PJD) configuration. Its thermal resistance is θJA = 21.47°C/W and θJC = 0.38°C/W when mounted per TI's recommended layout with 2-oz copper. The exposed thermal pad must be soldered to a large PCB copper pour to maintain junction temperature within –40°C to +125°C operating limits. This thermal design is validated in TI's SLMA002 PowerPAD technical brief.
Does the TPS23841PJDR support IEEE 802.3af Power over Ethernet compliance?
Yes, the TPS23841PJDR is fully IEEE 802.3af-compliant. It performs standardized two-point discovery using 2.8–4.4 V and 8.8–10 V probe voltages, supports Class 0–4 classification with defined current thresholds (e.g., 33 mA for Class 4), enforces current limits (650 mA nominal), and implements DC disconnect detection at 7.5–10 mA. All timing, voltage, and current parameters align with Clause 33 of the IEEE 802.3af-2003 standard as documented in the SLUS745A datasheet.
How does the TPS23841PJDR handle fault conditions such as overvoltage or overcurrent?
The TPS23841PJDR detects overvoltage (54–56 V threshold), undervoltage (42–44 V), overcurrent (615 mA cut-off), and thermal faults (>125°C junction). Upon detection, it disables the affected port, latches a 3-bit fault code in the Status Read 1 register, and asserts the open-drain INTB pin low. Fault recovery requires either expiration of the 750-ms TED timer (in Auto Mode) or host-initiated reset via I²C - ensuring safe, deterministic response without latch-up.
Can the TPS23841PJDR operate without a microcontroller?
Yes, the TPS23841PJDR supports fully autonomous operation in Auto Mode (MS pin low), performing end-to-end IEEE 802.3af discovery, classification, and power delivery without external firmware. It also offers Semi-Auto Mode (I²C read access to status/A/D registers with limited write control) and Power Management Mode (full I²C read/write for advanced control) - giving designers flexibility from plug-and-play to software-defined PoE orchestration.
What are the key differences between the TPS23841PJDR and the TPS23841PAP?
The TPS23841PJDR and TPS23841PAP share identical electrical specifications and functionality but differ only in PowerPAD orientation: PJDR uses "PowerPAD up" (thermal pad on top surface), while PAP uses "PowerPAD down" (thermal pad on bottom). Both have identical pinouts, thermal resistance values (θJA = 21.47°C/W), and package dimensions. The choice depends on PCB thermal stack-up - PJDR allows top-side heatsinking, PAP enables bottom-side thermal vias.
TPS23841PJDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 64-TQFP Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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)
TPS23841PJDR FAQ
1.How can I place an order for TPS23841PJDR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS23841PJDR 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 TPS23841PJDR reliable?
The price and inventory of TPS23841PJDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS23841PJDR is usually 5 days.
3.What payment methods are accepted for TPS23841PJDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS23841PJDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS23841PJDR?
TPS23841PJDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS23841PJDR 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 TPS23841PJDR?
For technical support, including TPS23841PJDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS23841PJDR requirements.
6.How does Aetrix verify that TPS23841PJDR is sourced from the original manufacturer or authorized distributors?
All TPS23841PJDR 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 TPS23841PJDR meets industry standards.
7.What is the process for return or replacement of TPS23841PJDR?
All TPS23841PJDR units undergo pre-shipment inspection (PSI). If there is an issue with TPS23841PJDR, 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 TPS23841PJDR part is unused and in its original packaging.
Return procedure for TPS23841PJDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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