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STMicroelectronics STHS2375LM6F
- Part No.:
- STHS2375LM6F
- Manufacturer:
- STMicroelectronics
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
STHS2375LM6F.pdf
- Description:
- IC POE CNTRL 1 CHANNEL 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,427
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Product details
Overview
STHS2375LM6F from STMicroelectronics is an IEEE 802.3af-compliant Powered Device (PD) interface controller with integrated 100V/500mA low-side MOSFET, resistor-programmable inrush current limit (140mA typical), 460mA normal operation current limit, and standard UVLO thresholds (39.3V rising / 30.5V falling). It enables PoE power handshaking and hot-swap protection in VoIP phones and WLAN access points.
For engineers reviewing the STHS2375LM6F datasheet, STHS2375LM6F pinout, STHS2375LM6F application, or STHS2375LM6F equivalent, key selection criteria include UVLO latch mode, classification resistor support (Class 0–4), PG open-drain signaling referenced to RTN, and SO8 package compatibility with legacy PSE detection.
Technical Context
The STHS2375LM6F implements full IEEE 802.3af PD detection (24.9kΩ signature resistor), classification (RCLASS = 255–4420 Ω), and inrush control via external ILIM resistor (62.5–500 kΩ). Its internal 100V-rated MOSFET operates as a low-side switch with 0.72–1.0 Ω RDS(ON) at 300mA.
It features latch-mode fault recovery after hard overcurrent or thermal overload (TSHUTDOWN = 140°C), Power Good (PG) output active-high with 75–225 µs deglitch, and industrial temperature operation (–40°C to +85°C). The device uses internal voltage offset diodes for polarity-insensitive input bridge compatibility.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IEEE Compliance | Fully compliant with IEEE 802.3af PD interface requirements including detection, classification, and inrush control. |
| Integrated MOSFET | 100V rated, 500mA max continuous current, low-side switch with 0.72–1.0 Ω RDS(ON) ensures minimal conduction loss. |
| Inrush Current Limit | Resistor-programmable (ILIM pin); 140mA typical with 178kΩ for legacy PSE compatibility. |
| Normal Operation Limit | 405–515mA (typ. 460mA) current limit protects downstream DC/DC converter during steady-state PoE delivery. |
| UVLO Threshold | Standard mode: 39.3V (rising), 30.5V (falling); hysteresis 8.8V prevents oscillation during brownout conditions. |
| Power Good Output | Open-drain PG referenced to RTN; asserts high when MOSFET is fully on and system is stable (75–225 µs deglitch). |
| Thermal Protection | Latch-mode shutdown at 140°C junction temperature with 20°C hysteresis ensures safe recovery only after manual reset. |
Pinout & Package
STHS2375LM6F is housed in an 8-pin SO (SO8, M package), 150 mils width, RoHS-compliant plastic small outline package per JEDEC MS-012.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 ILIM | Inrush current limit programming input | Connect resistor to VSS to set start-up inrush (ILIM = 25,000/RILIM A); 178kΩ yields ~140mA for legacy PSEs. |
| 2 CLASS | Classification resistor connection | Connect resistor to VSS to declare IEEE Class 0–4 (e.g., 255Ω = Class 4); enables PSE power allocation negotiation. |
| 3 DET | Detection resistor connection | 24.9kΩ resistor to VDD enables PSE to identify valid PD presence during discovery phase. |
| 4 VSS | PSE-side ground / return line | Common reference for detection, classification, and UVLO circuits; return path for input-side current. |
| 5 RTN | Load-side negative power rail output | Delivers PoE power to downstream DC/DC converter; PG signal referenced to this node. |
| 6 PG | Power Good status output | Open-drain, active-high signal indicating MOSFET is fully on and system is operating normally. |
| 7 UVLO | Undervoltage Lockout input (NC) | No connect - STHS2375L uses internal UVLO divider; pin 7 is unconnected in this variant. |
| 8 VDD | Input/output positive power rail | Accepts PoE input (0–57V); supplies internal regulator and drives external load via RTN/VSS loop. |
Key Features
| Feature | Design Value |
|---|---|
| Latch-mode fault recovery | Hard overcurrent or thermal events disable output until manual power cycle - prevents uncontrolled retries in faulty systems. |
| Resistor-programmable classification | Supports all IEEE 802.3af Classes 0–4 via external RCLASS (255–4420 Ω), enabling precise PSE power budgeting. |
| Integrated 100V MOSFET | Eliminates need for external high-voltage switch; withstands PoE transients up to 100V without external TVS clamping. |
| Voltage-offset input stage | Internal diode pair accommodates polarity-insensitive Ethernet diode bridge, simplifying front-end design. |
| Industrial temperature range | Guaranteed operation from –40°C to +85°C ambient supports deployment in uncontrolled environments like wall-mounted VoIP phones. |
Applications
| VoIP Phones | WLAN Access Points |
|---|---|
|
Use Scenario: Powered via Ethernet cable in office or residential deployments without local AC adapter. IC Role / Device Role / Timing Role: PD interface controller managing detection, classification, inrush limiting, and hot-swap sequencing before enabling DC/DC conversion. Use Value: Enables single-cable deployment with guaranteed interoperability against IEEE 802.3af PSEs and robust latch-mode fault containment. |
Use Scenario: Remote wireless infrastructure unit mounted on ceiling or pole with no local power source. IC Role / Device Role / Timing Role: Controls PoE power entry, provides PG signal to enable RF subsystem only after stable rail establishment. Use Value: Ensures clean power-up sequence and prevents RF module damage during inrush or brownout events. |
| Web Cameras | POS Terminals |
|
Use Scenario: High-resolution IP camera requiring reliable PoE power in retail or surveillance environments. IC Role / Device Role / Timing Role: Acts as primary PD interface with thermal shutdown and latch behavior to prevent repeated fault cycling under overheating conditions. Use Value: Maintains system integrity by locking out power during sustained overtemperature, avoiding video dropout or corruption. |
Use Scenario: Point-of-sale terminal deployed in retail stores using PoE for simplified cabling and centralized UPS backup. IC Role / Device Role / Timing Role: Provides detection signature, classifies as Class 2 (3.84–6.49W), and delivers stable RTN rail to microcontroller and display subsystems. Use Value: Reduces BOM count by integrating MOSFET and control logic while meeting strict UL/cUL safety requirements for commercial equipment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Powered Device interface applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STHS2375AM6F | Same UVLO thresholds and latch/auto configuration, but auto-retry (A) instead of latch (L) fault recovery. | Preferred where automatic recovery after transient overloads is required, e.g., in intermittently loaded embedded gateways. | Select STHS2375AM6F if system must self-recover after brief overcurrent without manual intervention. |
| LT4275AIMSE#PBF | IEEE 802.3af-compliant PD controller with 100V rating, but uses external MOSFET and offers programmable UVLO via resistor divider. | Suitable for designs requiring flexible UVLO tuning or higher reliability margin via discrete FET selection. | Choose LT4275AIMSE#PBF when external MOSFET control, enhanced diagnostics, or wider UVLO adjustment range is needed. |
Compared with STHS2375LM6F, the STHS2375AM6F offers identical electrical specs but auto-retry behavior instead of latch, while the LT4275AIMSE#PBF trades integration for flexibility-requiring external FET but supporting adjustable UVLO and advanced monitoring features.
Availability
STHS2375LM6F is available at Aetrix Electronics and suitable for VoIP phones, WLAN access points, and POS terminals requiring stable component supply with industrial temperature support and IEEE 802.3af compliance.
Supply support for STHS2375LM6F 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, MCU, power, and sensor solutions for industrial, automotive, and consumer markets.
The STHS237x family targets PoE-powered edge devices, delivering integrated, standards-compliant PD interface functionality with minimal external components and robust fault handling for cost-sensitive, space-constrained applications.
FAQ
What is the function of the ILIM pin on STHS2375LM6F?
The ILIM pin sets the inrush current limit by connecting an external resistor to VSS. With RILIM = 178kΩ, it configures ~140mA inrush current-optimized for compatibility with legacy IEEE 802.3af Power Sourcing Equipment. Leaving ILIM open or shorted to VSS disables inrush control and may cause PSE detection failure.
Does STHS2375LM6F require an external MOSFET?
No. STHS2375LM6F integrates a 100V, 500mA low-side power MOSFET with 0.72–1.0 Ω RDS(ON), eliminating the need for external switching elements. This reduces board area, BOM count, and layout complexity while maintaining full IEEE 802.3af compliance for detection, classification, and power delivery.
How does the Power Good (PG) output behave during startup?
PG is an open-drain output referenced to RTN. It remains low until the internal MOSFET fully turns on and system voltage stabilizes. After inrush termination and UVLO exit, PG asserts high (high-impedance state) with 75–225 µs deglitch filtering to reject noise. A pull-up resistor to RTN is required for proper logic-level signaling.
Is STHS2375LM6F still in active production?
STHS2375LM6F is marked as obsolete by STMicroelectronics per official documentation, but Aetrix Electronics maintains legacy inventory and offers lifecycle coordination support-including last-time buy planning, cross-reference guidance, and qualified alternatives-for ongoing production programs relying on this device.
STHS2375LM6F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 250µA
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
STHS2375LM6F FAQ
1.How can I place an order for STHS2375LM6F through Aetrix?
Please submit a Request for Quotation (RFQ) for STHS2375LM6F 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 STHS2375LM6F reliable?
The price and inventory of STHS2375LM6F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STHS2375LM6F is usually 5 days.
3.What payment methods are accepted for STHS2375LM6F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STHS2375LM6F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STHS2375LM6F?
STHS2375LM6F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STHS2375LM6F 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 STHS2375LM6F?
For technical support, including STHS2375LM6F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STHS2375LM6F requirements.
6.How does Aetrix verify that STHS2375LM6F is sourced from the original manufacturer or authorized distributors?
All STHS2375LM6F 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 STHS2375LM6F meets industry standards.
7.What is the process for return or replacement of STHS2375LM6F?
All STHS2375LM6F units undergo pre-shipment inspection (PSI). If there is an issue with STHS2375LM6F, 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 STHS2375LM6F part is unused and in its original packaging.
Return procedure for STHS2375LM6F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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