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Texas Instruments TPS23851DCER
- Part No.:
- TPS23851DCER
- Manufacturer:
- Texas Instruments
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 36-BSOP (0.295", 7.50mm Width)
- Datasheet:
-
TPS23851DCER.pdf
- Description:
- IC POE CNTRL 4 CHANNEL 36SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,251
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Product details
Overview
TPS23851DCER from Texas Instruments is a quad IEEE 802.3at-2009 compliant Power over Ethernet (PoE) Power Sourcing Equipment (PSE) controller in a 36-pin SSOP package. It delivers up to 30 W per port, supports four independent PSE ports, integrates 14-bit per-port A/D converters for real-time voltage and current monitoring, and implements AC/DC disconnect detection with an on-chip 110-Hz oscillator - used in enterprise Ethernet switches requiring high-reliability PoE management.
For engineers reviewing the TPS23851DCER datasheet, TPS23851DCER pinout, TPS23851DCER application, or TPS23851DCER equivalent, this page provides verified technical context, confirmed pin functions, IEEE 802.3at Type 2 compliance details, I²C register compatibility, and validated alternative controllers for multi-port PoE system design.
Technical Context
The TPS23851DCER implements a four-channel PSE control architecture with independent detection, classification, and power application per port. Each channel features dedicated DET, SEN, OUT, GAT, and SHDN pins, integrated 110-Hz AC disconnect waveform generation, and per-port 14-bit A/D conversion for VOUT and IOUT measurement.
It supports three operational modes - automatic, semi-automatic, and processor-controlled - via AUTO pin and I²C interface, and uses di/dt-controlled gate drive with foldback current limiting to manage MOSFET stress during short-circuit events. Its register set is software-compatible with industry-standard PSE controllers including LTC4259A and MAX5952.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IEEE Compliance | Fully compliant with IEEE Std 802.3at-2009 (Type 2), supporting up to 30 W per port. |
| Port Count | Four independent PSE ports with full detection, classification, and power delivery control. |
| Current Limit Range | Programmable ICUT threshold from 45 mA to 430 mV across eight settings; ILIM limit up to 452 mV in 2X mode. |
| I²C Interface | 4-bit address (64-port support), 400 kHz max clock, open-drain SDA/SCL with internal pullups. |
| Operating Temp | -20°C to +125°C junction temperature range, qualified for industrial and telecom infrastructure use. |
| Supply Voltages | VDD = 3.0–3.5 V (3.3 V nominal); VEE = -44 to -57 V (typically -48 V) referenced to AGND. |
| AC Disconnect | On-chip 110-Hz sine wave generator on DET pins; 3.5–4.5 Vpp output with ±260 µA min drive capability. |
Pinout & Package
TPS23851DCER is housed in a 36-pin SSOP (DCE) package with exposed thermal pad, optimized for PoE midspan and switch applications requiring high-density port integration and thermal reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, RESET | Digital input | Active-low reset with internal 1–5 µs deglitch filter; forces all ports off and restores register defaults. |
| 3, INT | Open-drain output | Asserts low when interrupt register bits are set; updated between I²C transactions for fault reporting. |
| 4, SCL / 5, SDAO / 6, SDAI | I²C interface | Separate SDA input/output lines enable opto-isolated I²C bus; compatible with standard 400 kHz timing. |
| 11–14, DET1–DET4 | Analog sense input | Per-port PD detection and AC disconnect sensing; supports 4-point discovery to reject capacitive loads. |
| 28, VEE | Negative supply rail | -44 to -57 V analog supply; powers gate drivers and analog front-end; requires 0.1 µF + 1 µF bypassing to AGND. |
| 33–30, 27, 24, GAT1–GAT4 | Gate drive output | Drives external N-channel MOSFET gates; includes di/dt ramp control and fast short-circuit shutdown (<1 µs). |
| 34–31, 26, 23, OUT1–OUT4 | Analog monitor input | Measures port output voltage via 10-kΩ resistor divider; enables power-good detection and foldback action. |
| 32–29, 25, 22, SEN1–SEN4 | Current sense input | Monitors MOSFET source current through 0.5 Ω sense resistor; feeds A/D converter and foldback engine. |
Key Features
| Feature | Design Value |
|---|---|
| Never-Fooled 4-Point Detection | Rejects legacy/capacitive loads by measuring two current levels and corresponding DET voltage points. |
| Per-Port 14-Bit A/D Conversion | Enables real-time precision monitoring of port voltage and current without host CPU overhead. |
| AC/DC Disconnect Detection | On-chip 110-Hz oscillator eliminates need for external AC signal generator; DC disconnect uses 2.5 mV threshold. |
| I²C Watchdog & Failsafe | Prevents lockup by forcing port shutdown if I²C communication stalls beyond watchdog timeout. |
| Flexible Shutdown Modes | Supports individual port shutdown (SHDN1–4), multiplexed shutdown (SHDN1_A), and global reset (RESET). |
Applications
| Enterprise Ethernet Switches | Midspan PoE Injectors |
|---|---|
Use Scenario: 24- or 48-port managed switches delivering PoE++ to IP phones, wireless APs, and PTZ cameras. IC Role / Device Role / Timing Role: Quad PSE controller managing four concurrent PoE channels with real-time current/voltage telemetry and LLDP-classified power allocation. Use Value: Enables precise per-port power budgeting up to 30 W, reducing thermal derating and improving system-level efficiency. |
Use Scenario: Standalone midspan units adding PoE capability to legacy non-PoE switches. IC Role / Device Role / Timing Role: Independent PSE controller handling detection, classification, and safe power application without host processor dependency. Use Value: Supports auto-mode operation (via AUTO pin) for plug-and-play deployment with no firmware required. |
| Industrial Network Routers | Smart Building Controllers |
Use Scenario: Ruggedized routers deployed in factory automation, SCADA, or outdoor telecom cabinets. IC Role / Device Role / Timing Role: High-reliability PSE managing PoE for sensors, actuators, and edge gateways under extended temperature (-20°C to +125°C). Use Value: Integrated thermal shutdown (143–161°C) and UVLO protection ensure robust operation in uncontrolled environments. |
Use Scenario: Centralized building management systems powering access control readers, occupancy sensors, and HVAC nodes. IC Role / Device Role / Timing Role: Multi-port PSE enabling centralized power provisioning with remote fault logging via I²C-integrated interrupt reporting. Use Value: Per-port A/D data allows predictive maintenance by tracking long-term load drift and detecting early-stage PD degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad PoE PSE controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4259AIDE#PBF | Quad 802.3af-compliant PSE; lacks 802.3at Type 2 support, no on-chip AC oscillator, lower max port current (400 mA vs 720+ mA). | Suitable for legacy 15.4 W/port deployments only; not viable for PoE++ or high-power PDs like PTZ cameras. | Select when cost sensitivity outweighs power scalability and AC disconnect is handled externally. |
| MAX5952ATE+T | Quad 802.3at-compliant PSE; supports 30 W/port but uses different I²C register map and lacks per-port A/D converters. | Requires external ADC for current/voltage telemetry; no built-in 110-Hz AC waveform generator. | Choose when register compatibility with existing TI-based firmware is not required and telemetry is host-managed. |
Compared with LTC4259AIDE#PBF and MAX5952ATE+T, the TPS23851DCER uniquely integrates per-port 14-bit A/D conversion, on-chip 110-Hz AC disconnect, and full IEEE 802.3at Type 2 compliance - enabling higher power density, reduced BOM count, and autonomous diagnostics in next-gen PoE infrastructure.
Availability
TPS23851DCER is available at Aetrix Electronics and suitable for enterprise Ethernet switches, midspan PoE injectors, and industrial network routers requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for TPS23851DCER 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 solutions for industrial, automotive, and communications markets.
The TPS23851DCER belongs to TI's Power over Ethernet PSE controller product line, designed specifically for high-density, high-reliability IEEE 802.3at-compliant infrastructure equipment with autonomous operation and real-time telemetry requirements.
FAQ
What is the maximum per-port power capability of the TPS23851DCER?
The TPS23851DCER supports IEEE 802.3at Type 2 operation with up to 30 W per port. It achieves this via programmable current limits (up to 720+ mA with LLDP classification), foldback current limiting, and di/dt-controlled gate drive - all verified under -20°C to +125°C operating conditions per the SLUSAB3B datasheet.
Does the TPS23851DCER support automatic mode without a host microcontroller?
Yes, the TPS23851DCER supports fully autonomous operation in auto mode when the AUTO pin is asserted high at power-on reset. In this mode, it performs detection, classification, and power application independently - eliminating the need for continuous I²C host intervention while retaining interrupt reporting via the INT pin.
How does the TPS23851DCER implement AC disconnect detection?
The TPS23851DCER uses an integrated 110-Hz precision sine wave oscillator to drive the DET1–DET4 pins. It measures resultant current to calculate port impedance; if impedance exceeds threshold, the port shuts down. The oscillator delivers 3.5–4.5 Vpp output with ±260 µA minimum drive - eliminating external AC signal components.
What is the function of the SHDN1_A pin on the TPS23851DCER?
The SHDN1_A pin on the TPS23851DCER serves dual roles: as a manual shutdown input for Port 1 when multiplexed shutdown is disabled, or as a multiplexed shutdown trigger for all four ports when enabled via the Multiplexed Shutdown Configuration Register. It is internally pulled up to VDD and includes a 1–5 µs deglitch filter.
Can the TPS23851DCER be used with external MOSFETs rated above 100 V?
Yes - the TPS23851DCER's GAT1–GAT4 outputs drive external N-channel MOSFETs, and its OUT1–OUT4 pins monitor port voltage up to -66 V. When paired with appropriately rated MOSFETs and layout (e.g., reinforced clearance for -48 V systems), it supports full IEEE 802.3at compliance including high-voltage transient tolerance per safety standards.
TPS23851DCER Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 36-BSOP (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Controller (PSE)
- Number of Channels:
- 4
- Power - Max:
- 34.2 W
- Internal Switch(s):
- No
- Auxiliary Sense:
- No
- Standards:
- 802.3at (PoE+), 802.3af (PoE)
- Voltage - Supply:
- 44V ~ 57V
- Current - Supply:
- 2mA
- Operating Temperature:
- -20°C ~ 85°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 36-SSOP
TPS23851DCER FAQ
1.How can I place an order for TPS23851DCER through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS23851DCER 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 TPS23851DCER reliable?
The price and inventory of TPS23851DCER are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS23851DCER is usually 5 days.
3.What payment methods are accepted for TPS23851DCER?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS23851DCER transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS23851DCER?
TPS23851DCER orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS23851DCER 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 TPS23851DCER?
For technical support, including TPS23851DCER datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS23851DCER requirements.
6.How does Aetrix verify that TPS23851DCER is sourced from the original manufacturer or authorized distributors?
All TPS23851DCER 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 TPS23851DCER meets industry standards.
7.What is the process for return or replacement of TPS23851DCER?
All TPS23851DCER units undergo pre-shipment inspection (PSI). If there is an issue with TPS23851DCER, 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 TPS23851DCER part is unused and in its original packaging.
Return procedure for TPS23851DCER:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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