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STMicroelectronics STHS2375AM6F
- Part No.:
- STHS2375AM6F
- Manufacturer:
- STMicroelectronics
- Category:
- Power Over Ethernet (PoE) Controllers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
STHS2375AM6F.pdf
- Description:
- IC POE CNTRL 1 CHANNEL 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,700
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Product details
Overview
STHS2375AM6F from STMicroelectronics is an IEEE 802.3af-compliant Powered Device (PD) interface controller for Power over Ethernet systems. It integrates a 100V, 500mA low-side power MOSFET, resistor-programmable inrush current limit (140mA typical), 460mA normal operation current limit, and open-drain Power Good output. Used in VoIP phones and WLAN access points to manage safe hot-swap insertion and classification on PoE data lines.
For engineers reviewing the STHS2375AM6F datasheet, STHS2375AM6F pinout, STHS2375AM6F application, or STHS2375AM6F equivalent, key selection criteria include UVLO threshold (39.3 V rising), classification resistor support (Class 0–4), latch vs. auto-retry mode, SO8 package compatibility, and integrated thermal overload protection.
Technical Context
The STHS2375AM6F implements full IEEE 802.3af PD detection, classification, and inrush control using internal comparators, current mirrors, and a 12V regulator. Its detection circuitry accepts 24.9kΩ signature resistance and supports Class 0–4 via external RCLASS (255–4420 Ω), with classification current ranging from 2.4 mA (Class 0) to 41.2 mA (Class 4).
It features three UVLO modes - standard (39.3 V rise / 30.5 V fall), programmable (STHS2376 only), or legacy (35.1 V rise) - but STHS2375AM6F uses fixed standard thresholds. The device operates in auto-retry (A) mode after fault, includes 150 µs PG deglitching, and delivers Power Good referenced to RTN with 0.4 V max low-level voltage at 2 mA sink.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IEEE Compliance | Fully compliant with IEEE 802.3af PD interface requirements for detection, classification, and inrush control. |
| Inrush Current Limit | Resistor-programmable; 140 mA typical with 178 kΩ ILIM resistor, enabling safe hot-swap into PSE without violating inrush limits. |
| Normal Operation Limit | 460 mA maximum sustained current (min 405 mA, max 515 mA), defining continuous load capability before thermal shutdown. |
| UVLO Threshold | 39.3 V (rising), 30.5 V (falling); ensures stable startup and graceful shutdown during PoE line undervoltage events. |
| Power Good Output | Open-drain, active-high signal referenced to RTN; asserts after inrush completion and UVLO exit, with 75–225 µs deglitching. |
| Thermal Shutdown | Triggers at 140 °C junction temperature with 20 °C hysteresis, preventing damage during sustained overload or poor heatsinking. |
| RDS(ON) | 0.72–1.0 Ω at 300 mA; defines conduction loss and self-heating under full load, critical for efficiency and thermal design. |
Pinout & Package
STHS2375AM6F is housed in an 8-pin SO (SO8, M package), 150 mils width, RoHS-compliant surface-mount package with exposed pad not present. Pin functions are validated per ST's Figure 2 and Table 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 ILIM | Inrush current limit programming input | Connects to VSS via resistor (e.g., 178 kΩ) to set 140 mA inrush; open or shorted connection disables function. |
| 2 CLASS | Classification current setting node | Connects to VSS via resistor (255–4420 Ω) to declare IEEE 802.3af Class 0–4; leakage <1 µA avoids false classification. |
| 3 DET | Detection signature node | Connects to VDD via 24.9 kΩ ±1% resistor to enable PSE detection; leakage <5 µA maintains detection integrity. |
| 4 VSS | PSE-side ground return | Common reference for detection, classification, and UVLO circuits; carries return current from PSE side. |
| 5 RTN | Load-side negative power rail | Delivers regulated DC power to downstream DC/DC converter; sinks up to 460 mA continuously. |
| 6 PG | Power Good status output | Open-drain output referenced to RTN; high-impedance = normal operation; pulled low during fault or startup. |
| 7 UVLO | Undervoltage Lockout input | No connect (NC) for STHS2375AM6F; reserved for STHS2376 variants only. |
| 8 VDD | Input/output positive power rail | Accepts 0–57 V PoE input; also serves as output rail to downstream circuitry; withstands 100 V transients. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 100V, 500mA MOSFET | Eliminates need for external high-voltage switch; RDS(ON) ≤1.0 Ω reduces conduction loss and board space. |
| Resistor-programmable classification | Supports all IEEE 802.3af Classes 0–4 using standard 1% resistors (255–4420 Ω), simplifying BOM and layout. |
| Auto-retry fault recovery | Automatically re-attempts power-up after thermal or overcurrent faults, improving system resilience without host intervention. |
| Voltage offset for diode bridge | Internal two-diode offset accommodates polarity-insensitive input bridges, removing need for external bias networks. |
| Industrial temperature range | Operates from –40 °C to +85 °C ambient, ensuring reliability in uncontrolled environments like office VoIP deployments. |
Applications
| VoIP Phones | WLAN Access Points |
|---|---|
Use Scenario: Powered via Ethernet cable in enterprise desk phone installations with centralized PoE switches. IC Role / Device Role / Timing Role: PD interface controller managing detection, classification, inrush, and Power Good signaling to enable safe 48 V DC delivery. Use Value: Enables single-cable deployment without local AC adapters; auto-retry mode maintains call continuity after transient overload. |
Use Scenario: Wall- or ceiling-mounted wireless access point drawing power from PoE-enabled network infrastructure. IC Role / Device Role / Timing Role: Hot-swap controller enforcing IEEE 802.3af compliance while delivering stable 48 V input to RF and baseband subsystems. Use Value: Supports Class 3 (up to 12.95 W) operation with 460 mA current limit; thermal shutdown prevents overheating in enclosed enclosures. |
| Web Cameras | POS Terminals |
Use Scenario: IP-based security camera installed in retail or industrial settings where only Ethernet cabling is available. IC Role / Device Role / Timing Role: PD front-end that validates PSE signature, classifies power needs, and gates power to imaging and processing modules. Use Value: 24.9 kΩ detection resistor ensures reliable PSE handshake; 140 mA inrush limit prevents PSE port reset during camera boot. |
Use Scenario: Point-of-sale terminal deployed in stores with PoE-powered network backhaul and minimal local power options. IC Role / Device Role / Timing Role: Interface controller providing isolated, regulated DC input to payment processor, display, and peripheral interfaces. Use Value: Open-drain PG signal synchronizes DC/DC enable timing; SO8 package enables compact, cost-effective PCB layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Powered Device interface applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT4275AIMSE#PBF | Higher 60 V absolute max input; integrated 100 V MOSFET; supports IEEE 802.3at (PoE+); no UVLO programmability. | Enables higher-power Class 4 devices (up to 25.5 W); requires different classification resistor values and layout due to different pinout. | Select when upgrading to PoE+ or needing tighter 1.5% classification current tolerance. |
| NCP1094MNTXG | Lower 57 V max rating; 400 mA current limit; no integrated MOSFET (external FET required); supports legacy and standard UVLO only. | Suitable for cost-sensitive Class 1–2 designs; adds external gate driver and MOSFET footprint; lacks auto-retry latching behavior. | Choose for budget-constrained designs where external FET selection provides flexibility in RDS(ON) and thermal management. |
Compared with LT4275AIMSE#PBF and NCP1094MNTXG, STHS2375AM6F offers fixed standard UVLO, auto-retry recovery, and SO8 packaging optimized for mid-power (≤12.95 W) IEEE 802.3af deployments - balancing integration, reliability, and ease of qualification.
Availability
STHS2375AM6F is available at Aetrix Electronics and suitable for VoIP phones, WLAN access points, and web cameras requiring stable component supply across industrial temperature ranges and long-lifecycle PoE deployments.
Supply support for STHS2375AM6F 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, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.
The STHS237x family was developed specifically for IEEE 802.3af-compliant Powered Device interface control, integrating detection, classification, inrush limiting, and thermal protection into a single IC for simplified PoE endpoint design.
FAQ
What is the purpose of the ILIM pin on STHS2375AM6F?
The ILIM pin sets the inrush current limit by connecting an external resistor to VSS. With a 178 kΩ resistor, it configures 140 mA typical inrush current to comply with IEEE 802.3af limits. Leaving ILIM open or shorted to VSS disables inrush control and may cause PSE port shutdown during hot-plug events.
Can STHS2375AM6F be used with IEEE 802.3at (PoE+) PSEs?
No - STHS2375AM6F is IEEE 802.3af-only and rated for up to 12.95 W (Class 4). It lacks 802.3at-specific features like dual-signature detection, higher current limits, or 25.5 W power handling. Using it with 802.3at PSEs will result in Class 0 or Class 1 negotiation and limited power delivery.
How does the Power Good (PG) output behave during fault conditions?
PG is an open-drain output referenced to RTN. It goes high-impedance only when the device exits UVLO, completes inrush, and sustains normal operation above 405 mA. During UVLO, thermal shutdown, or overcurrent, PG is actively pulled low. Its 75–225 µs deglitching prevents false toggling from noise.
Is the UVLO pin (Pin 7) functional on STHS2375AM6F?
No - Pin 7 (UVLO) is No Connect (NC) on STHS2375AM6F. This pin is only active on STHS2376x variants for programmable UVLO configuration. On STHS2375AM6F, UVLO thresholds are fixed at 39.3 V (rising) and 30.5 V (falling), internally derived from VDD.
STHS2375AM6F 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
STHS2375AM6F FAQ
1.How can I place an order for STHS2375AM6F through Aetrix?
Please submit a Request for Quotation (RFQ) for STHS2375AM6F 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 STHS2375AM6F reliable?
The price and inventory of STHS2375AM6F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STHS2375AM6F is usually 5 days.
3.What payment methods are accepted for STHS2375AM6F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STHS2375AM6F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STHS2375AM6F?
STHS2375AM6F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STHS2375AM6F 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 STHS2375AM6F?
For technical support, including STHS2375AM6F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STHS2375AM6F requirements.
6.How does Aetrix verify that STHS2375AM6F is sourced from the original manufacturer or authorized distributors?
All STHS2375AM6F 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 STHS2375AM6F meets industry standards.
7.What is the process for return or replacement of STHS2375AM6F?
All STHS2375AM6F units undergo pre-shipment inspection (PSI). If there is an issue with STHS2375AM6F, 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 STHS2375AM6F part is unused and in its original packaging.
Return procedure for STHS2375AM6F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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