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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Power Over Ethernet (PoE) Controllers

Skyworks Solutions Inc. SI3460-E02-GM

Name: SI3460-E02-GM
Brand: Skyworks Solutions Inc.
SKU: SI3460-E02-GM
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SI3460-E02-GM

Manufacturer:: Skyworks Solutions Inc.

Category:: Power Over Ethernet (PoE) Controllers

Package:: 10-VFDFN Exposed Pad

Datasheet:: SI3460-E02-GM.pdf

Description:: IC POE CNTRL 1 CHANNEL 11QFN

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Product details

Overview

SI3460-E02-GM from Silicon Laboratories is an IEEE 802.3af-compliant single-port Power Sourcing Equipment (PSE) interface and DC-DC controller for PoE endpoint/midspan applications. It integrates a digital PWM-based –48 V dc-dc converter, supports robust 3-point PD detection, IEEE-compliant classification (Class 0–4), and autonomous operation without host processor control. It delivers up to 15.4 W output power with input UVLO at 10 V and operates across –40 to +85 °C.

For engineers reviewing the SI3460-E02-GM datasheet, SI3460-E02-GM pinout, SI3460-E02-GM application, or SI3460-E02-GM equivalent, key selection considerations include its 11-pin QFN (3 × 3 mm) package, classification-based current limiting, LED status signaling (detect/power good/fault), 250 kHz PWM frequency, and support for both endpoint and midspan configurations via STATUS pin voltage programming.

Technical Context

The SI3460-E02-GM implements a fully autonomous PSE state machine with integrated detection (3-point resistance sensing), classification (current-measured Class 0–4 assignment), disconnect (7.5 mA threshold, 350 ms hold time), and protection (UVLO, short-circuit, overload timing). Its digital PWM dc-dc controller generates –48 V output directly from 11–16 V input using external FETs and magnetics.

Pin-programmable configuration via STATUS pin voltage sets operating mode (endpoint/midspan), supported power level (4 W to 15.4 W), class range, and fault restart behavior (auto-restart after 2 s or reset-triggered). All functions-including GATE drive, CTRL1/CTRL2 PWM averaging, 250 kHz clock generation, and analog sensing (ISENSE, VSENSE, DETA)-are self-contained with no firmware or host interface required.

Key Specifications

Parameter	Value and Actual Design Meaning
IEEE Compliance	Fully compliant with IEEE 802.3af for detection, classification, disconnect, and power delivery-no external logic or timing adjustments needed.
Output Voltage	–46 V to –54 V (typ. –50 V) at VOUT; enables SELV-compatible telephony interface integration with standard PoE magnetics.
Input Supply Range	11 V to 16 V on VIN; operates directly from isolated +12 V or +15 V supply-no auxiliary regulator required.
Detection Algorithm	Robust 3-point signature resistance measurement (15–33 kΩ window) eliminates false detection from capacitive loads or noise.
Classification Support	Supports all IEEE 802.3af classes (0–4); current-sense-based classification at ISENSE determines power grant per configured class limits.
Thermal Range	–40 °C to +85 °C ambient operating temperature; thermal impedance θ_JA = 75 °C/W enables compact PCB layout without forced airflow.
Efficiency	75% typical system efficiency (VIN to VOUT); reduces heat dissipation in space-constrained embedded PSE designs.

Pinout & Package

SI3460-E02-GM uses an 11-pin Quad Flat No-Lead (QFN) package with 3 × 3 mm footprint, Pb-free and RoHS-compliant. Exposed thermal pad on underside improves thermal performance.

Pin/Terminal	Circuit Role	Design Meaning
GATE	Digital output	Drives external high-side PSE pass FET (M2); logic low enables –48 V output; requires gate driver stage per reference design.
CTRL1 / CTRL2	Digital outputs	Averaged PWM outputs controlling dc-dc converter duty cycle; also generate detection voltages during signature sensing phase.
250KHZ	Digital output	Fixed 250 kHz square wave (50% duty) filtered into triangular waveform for dc-dc control loop; gated off during detection/classification.
DETA	Analog input	Null detector input for resistive bridge during 3-point PD signature measurement; critical for accurate RDETmin/RDETmax validation.
VSENSE	Analog input	Feedback input for –48 V output regulation; 0.930 V at VSENSE corresponds to –50 V at VOUT per internal scaling.
ISENSE	Analog input	Current sense input for classification and overload monitoring; connects to shunt resistor to measure output current for class assignment and ICUT/ILIM enforcement.
STATUS	Analog in / Digital out	Configures mode (endpoint/midspan), class support, and fault restart behavior at power-up via resistor-divider voltage; also drives LED status indicator.
RST	Digital input	Active-low reset; forces inactive state (PWM off, M2 off) and resets state machine-used for manual recovery or system-level fault handling.

Key Features

Feature	Design Value
Autonomous PSE Operation	No host processor, firmware, or external timing components required-full IEEE 802.3af compliance implemented in hardware state machine.
Programmable Classification Power Level	STATUS pin voltage selects supported class range (e.g., 15.4 W for Class 0/3/4 or 4 W for Class 1 only), enabling BOM optimization per application need.
Integrated Protection Logic	Combines input UVLO (10 V turn-off), classification-based current limiting, short-circuit shutdown, and disconnect hysteresis-reduces external protection component count.
LED Status Signaling	Single STATUS pin drives LED with distinct blink patterns: 3 Hz during detection, steady-on during power delivery, 10 Hz rapid flash for faults (UVLO, overcurrent, class mismatch).
Midspan/Endpoint Dual Mode	Pin-configurable timing (e.g., 2 s vs. 250 ms disconnect backoff) satisfies IEEE 802.3af requirements for both midspan injectors and endpoint switches without redesign.

Applications

VoIP Endpoint Switches	FTTH Media Converters
Use Scenario: Embedded 4-port VoIP switch powering IP phones over Ethernet cabling in enterprise or SMB environments. IC Role / Device Role / Timing Role: SI3460-E02-GM acts as autonomous PSE controller managing detection, classification, and –48 V power delivery per port with no CPU involvement. Use Value: Enables cost-effective, space-efficient PoE implementation with full IEEE 802.3af compliance and thermal operation up to +85 °C in fanless enclosures.	Use Scenario: Fiber-to-the-home media converter delivering PoE to wireless access points or surveillance cameras at customer premises. IC Role / Device Role / Timing Role: SI3460-E02-GM serves as single-port PSE interface generating SELV-compatible –48 V output from 12 V input, supporting midspan timing for interoperability with legacy PDs. Use Value: Eliminates need for external microcontroller or timing IC while meeting strict isolation and safety requirements for residential deployment.
Cable Modem Gateways	Set-Top Box PoE Ports
Use Scenario: Integrated cable modem/router with built-in PoE port to power MoCA adapters or Wi-Fi extenders via Ethernet. IC Role / Device Role / Timing Role: SI3460-E02-GM provides autonomous, classification-aware PSE functionality with configurable power level (e.g., Class 2 for 7 W) to match downstream device requirements. Use Value: Reduces bill-of-materials by integrating dc-dc control and PSE logic into one IC, minimizing PCB area and qualification effort for consumer-grade devices.	Use Scenario: Advanced set-top box with PoE-enabled HDMI extender or IR blaster module powered over spare Ethernet pairs. IC Role / Device Role / Timing Role: SI3460-E02-GM functions as endpoint-mode PSE with auto-restart on fault, delivering stable –48 V output with inrush current control and disconnect detection. Use Value: Supports reliable hot-plug operation and seamless reconnection of accessories without requiring user intervention or system reboot.

VoIP Endpoint Switches

FTTH Media Converters

Use Scenario: Embedded 4-port VoIP switch powering IP phones over Ethernet cabling in enterprise or SMB environments.

IC Role / Device Role / Timing Role: SI3460-E02-GM acts as autonomous PSE controller managing detection, classification, and –48 V power delivery per port with no CPU involvement.

Use Value: Enables cost-effective, space-efficient PoE implementation with full IEEE 802.3af compliance and thermal operation up to +85 °C in fanless enclosures.

Use Scenario: Fiber-to-the-home media converter delivering PoE to wireless access points or surveillance cameras at customer premises.

IC Role / Device Role / Timing Role: SI3460-E02-GM serves as single-port PSE interface generating SELV-compatible –48 V output from 12 V input, supporting midspan timing for interoperability with legacy PDs.

Use Value: Eliminates need for external microcontroller or timing IC while meeting strict isolation and safety requirements for residential deployment.

Cable Modem Gateways

Set-Top Box PoE Ports

Use Scenario: Integrated cable modem/router with built-in PoE port to power MoCA adapters or Wi-Fi extenders via Ethernet.

IC Role / Device Role / Timing Role: SI3460-E02-GM provides autonomous, classification-aware PSE functionality with configurable power level (e.g., Class 2 for 7 W) to match downstream device requirements.

Use Value: Reduces bill-of-materials by integrating dc-dc control and PSE logic into one IC, minimizing PCB area and qualification effort for consumer-grade devices.

Use Scenario: Advanced set-top box with PoE-enabled HDMI extender or IR blaster module powered over spare Ethernet pairs.

IC Role / Device Role / Timing Role: SI3460-E02-GM functions as endpoint-mode PSE with auto-restart on fault, delivering stable –48 V output with inrush current control and disconnect detection.

Use Value: Supports reliable hot-plug operation and seamless reconnection of accessories without requiring user intervention or system reboot.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PSE controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
Si3462-A02-GM	Successor device with enhanced ESD tolerance (±4 kV HBM), improved efficiency (>80%), and extended classification accuracy across temperature; pin-compatible but requires updated layout for thermal pad.	Recommended for new designs requiring higher reliability, lower power loss, or broader environmental qualification (e.g., industrial outdoor gateways).	Select Si3462-A02-GM for new designs-Silicon Labs explicitly states SI3460-E02-GM is not recommended for new designs and cites Si3462 as the replacement path.
TPS23753APWPR	Analog-based PSE controller with external MOSFET drivers; lacks integrated dc-dc controller-requires separate –48 V supply or external flyback controller.	Suitable where system already includes isolated –48 V rail or where analog control loop tuning is preferred over digital PWM autonomy.	Choose TPS23753APWPR only if leveraging existing –48 V infrastructure or requiring TI's analog PSE ecosystem (e.g., companion PD controllers like TPS23750).

Compared with SI3460-E02-GM, Si3462-A02-GM offers higher efficiency and updated robustness for new designs, while TPS23753APWPR provides analog flexibility but demands external power conversion-making SI3460-E02-GM optimal for cost-sensitive, self-contained embedded PSEs where digital autonomy and integrated dc-dc control are prioritized.

Availability

SI3460-E02-GM is available at Aetrix Electronics and suitable for VoIP endpoint switches, FTTH media converters, cable modem gateways, and set-top box PoE ports requiring stable component supply and long-term industrial lifecycle support.

Supply support for SI3460-E02-GM 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

Silicon Laboratories is a fabless semiconductor company specializing in timing, IoT, and connectivity solutions, with deep expertise in mixed-signal IC design and energy-efficient system integration.

The SI3460-E02-GM belongs to Silicon Labs' Power-over-Ethernet (PoE) PSE controller product line, designed specifically for cost-optimized, autonomous, single-port embedded PSE implementations in endpoint and midspan equipment.

FAQ

What is the primary function of the SI3460-E02-GM in a PoE system?

The SI3460-E02-GM serves as a fully autonomous IEEE 802.3af-compliant Power Sourcing Equipment (PSE) controller and DC-DC converter. It manages PD detection, classification, power delivery, and protection-generating –48 V output directly from a 12 V or 15 V input without host processor involvement. Its role in the SI3460-E02-GM-based system is to eliminate external timing, control, or firmware dependencies while ensuring full standards compliance.

Does the SI3460-E02-GM require external firmware or a microcontroller to operate?

No, the SI3460-E02-GM operates completely autonomously. Its internal state machine handles all IEEE 802.3af functions-including 3-point detection, classification, disconnect, and protection-without firmware, software, or host processor interface. Configuration is achieved solely through passive components (e.g., STATUS pin resistor divider), making the SI3460-E02-GM ideal for resource-constrained embedded systems.

How does the SI3460-E02-GM support both endpoint and midspan PSE configurations?

The SI3460-E02-GM supports both modes via programmable STATUS pin voltage, which configures timing parameters including disconnect backoff delay (250 ms for endpoint, 2 s for midspan) and restart behavior. This eliminates the need for separate part numbers or board revisions-enabling one SI3460-E02-GM design to serve dual applications with only minor external resistor changes.

What protection features are integrated into the SI3460-E02-GM?

The SI3460-E02-GM integrates input undervoltage lockout (UVLO at 10 V), classification-based current limiting, output short-circuit protection, overload timing (60 ms timeout), and disconnect hysteresis. These protections are enforced in hardware without external components-ensuring robust operation during fault conditions while maintaining IEEE 802.3af compliance throughout the SI3460-E02-GM's operational life.

Is the SI3460-E02-GM still recommended for new designs?

No-Silicon Labs explicitly states "Not Recommended for New Designs" and recommends the SI3462 as the replacement. The SI3460-E02-GM remains available for legacy support and existing production, but new designs should use SI3462-A02-GM for improved efficiency, ESD tolerance, and long-term roadmap alignment. Aetrix Electronics maintains inventory of SI3460-E02-GM for continuity, but advises migration planning for future projects.

SI3460-E02-GM Specifications

Product attributes: Attribute value

Manufacturer:: Skyworks Solutions Inc.

Series:: -

Package/Case:: 10-VFDFN Exposed Pad

Packaging:: Tube

Product Status:: Obsolete

Type:: Controller (PSE), DC/DC

Number of Channels:: 1

Power - Max:: 15.4 W

Internal Switch(s):: No

Auxiliary Sense:: Yes

Standards:: 802.3af (PoE)

Voltage - Supply:: 11V ~ 16V

Current - Supply:: -

Operating Temperature:: -40°C ~ 85°C

Mounting Type:: Surface Mount

Supplier Device Package:: 11-QFN (3x3)

SI3460-E02-GM FAQ

1.How can I place an order for SI3460-E02-GM through Aetrix?

Please submit a Request for Quotation (RFQ) for SI3460-E02-GM 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 SI3460-E02-GM reliable?

The price and inventory of SI3460-E02-GM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI3460-E02-GM is usually 5 days.

3.What payment methods are accepted for SI3460-E02-GM?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI3460-E02-GM transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SI3460-E02-GM?

SI3460-E02-GM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SI3460-E02-GM 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 SI3460-E02-GM?

For technical support, including SI3460-E02-GM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI3460-E02-GM requirements.

6.How does Aetrix verify that SI3460-E02-GM is sourced from the original manufacturer or authorized distributors?

All SI3460-E02-GM 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 SI3460-E02-GM meets industry standards.

7.What is the process for return or replacement of SI3460-E02-GM?

All SI3460-E02-GM units undergo pre-shipment inspection (PSI). If there is an issue with SI3460-E02-GM, 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 SI3460-E02-GM part is unused and in its original packaging.

Return procedure for SI3460-E02-GM:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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