LT3669EUFD-2#PBF - IO-Link Transceiver with Integrated Buck Regulator and LDO | Analog Devices
MPN: LT3669EUFD-2#PBF ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.38 | $5.38 |
| 10 | $5.38 | $53.80 |
| 100 | $5.38 | $538.00 |
| 500 | $5.38 | $2,690.00 |
| 1,000 | $5.38 | $5,380.00 |
LT3669EUFD-2#PBF Overview
An IO-Link transceiver is a specialized industrial interface IC that connects compatible sensors and actuators to a point-to-point communication link. The LT3669 combines this interface function with power conversion, placing the component in the broader hierarchy of industrial interface IC, transceiver, power-management IC, and semiconductor. Its integrated regulator can supply the connected IO-Link device while the transceiver handles wake-up, communication, and fault-related interface behavior.
Key features identified in the verified Analog Devices material include one transmitter and one receiver, a 7.5 V to 40 V supply range, and a -40°C to +125°C operating-temperature range for the LT3669 comparison result. The LT3669-2 uses an external catch diode rather than the integrated catch diode used in the LT3669, making the external-diode distinction important when comparing versions. The manufacturer describes the LT3669 family as recommended for new designs.
The switching-regulator and LDO architecture can simplify industrial sensor or actuator boards by reducing external power-conversion component count. The programmable power-on reset timer supports controlled startup sequencing, while wake-up detection helps the system respond to connected-device activity. Current limit and transmitter slew rate are externally adjustable according to the manufacturer datasheet, allowing board-level optimization for the intended interface load and cable environment.
Typical applications include IO-Link sensors, proximity and position sensors, industrial actuators, factory automation equipment, and distributed industrial control systems. The wide 7.5 V to 40 V supply range is relevant for 24 V industrial environments, while the integrated regulator architecture is useful where board space and component count matter. The exact external diode, capacitor, resistor, and layout requirements must follow the Analog Devices datasheet.
When designing a board around the LT3669EUFD-2#PBF, confirm the external catch-diode selection, regulator compensation, output capacitance, and exposed-pad thermal implementation against the manufacturer guidance. Keep sensitive communication and power-return paths short, and provide adequate copper area for the 28-QFN package. Verify the selected sensor or actuator’s IO-Link current, wake-up behavior, and electrical timing before finalizing the power budget.
This page consolidates the verified manufacturer and distributor information, distinguishes the LT3669 and LT3669-2 external-diode distinction, and provides design-oriented guidance. Current pricing and availability remain distributor-dependent and should be checked for the exact suffix and order quantity.
Drop-in alternatives for LT3669EUFD-2#PBF — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with LT3669EUFD-2#PBF (same form factor and footprint) — differing in Package, Operating Temperature Range, Product Type, RoHS Status, Wake-Up Detect.
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No drop-in alternatives available for this product.
Request AlternativesLT3669EUFD-2#PBF Specifications
| Product Type | IO-Link transceiver with integrated step-down regulator and LDO |
| Protocol | IO-Link |
| Transmitter Count | 1 transmitter |
| Receiver Count | 1 receiver |
| Supply Voltage Range | 7.5 V to 40 V |
| Switching Regulator Load Current | Up to 300 mA |
| Catch Diode | External catch diode required for LT3669-2 |
| Operating Temperature Range | -40 °C to +125 °C |
| Package | 28-pin QFN, 4 mm x 5 mm |
| Mounting Type | Surface mount |
| Wake-Up Detection | Supported |
| Power-On Reset Timer | Programmable |
| Transmitter Current Limit | Externally adjustable |
| Transmitter Slew Rate | Externally adjustable |
| Integrated Power Functions | Step-down switching regulator and low-dropout linear regulator |
| Product Status | LT3669/LT3669-2 recommended for new designs |
| RoHS Status | Not stated in verified data |
| REACH Status | Not stated in verified data |
| Automotive Qualification | Not stated in verified data |
LT3669EUFD-2#PBF 28-pin qfn, 4 mm x 5 mm Pin Configuration Guide
Pin configuration for LT3669EUFD-2#PBF (28-pin qfn, 4 mm x 5 mm package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for LT3669EUFD-2#PBF.
Refer to the datasheet for full pin configuration.
Typical Applications
LT3669EUFD-2#PBF is suitable for 6 applications: Industrial IO-Link Sensors, Factory Automation Actuators, Proximity and Position Sensors, 24 V Industrial Control Modules, Distributed Industrial Control Systems, Industrial Sensor Hubs.
Industrial IO-Link Sensors
The LT3669EUFD-2#PBF fits compatible industrial IO-Link sensors that require local power conversion and wake-up handling in a compact 28-QFN footprint. Its 7.5 V to 40 V supply range accommodates industrial bus environments, while the integrated step-down regulator and LDO reduce the number of separate power stages near the sensor interface. The programmable power-on reset timer helps establish predictable startup behavior. Because the -2 version requires an external catch diode, the sensor board must reserve the recommended rectifier and layout space.
Recommended
Factory Automation Actuators
For compatible factory actuators, the LT3669EUFD-2#PBF combines the IO-Link physical interface with regulated local power delivery. The integrated regulator can supply up to 300 mA in the LT3669-2 configuration according to the verified Analog Devices product-page comparison, making it more suitable for higher-current operation than the LT3669 integrated-catch-diode version. The adjustable transmitter current limit and slew rate allow board-level tuning. Designers should still check actuator inrush, cable capacitance, fault behavior, and thermal conditions against the datasheet.
Recommended
Proximity and Position Sensors
The LT3669EUFD-2#PBF is appropriate for IO-Link proximity, position, and discrete sensor assemblies where wake-up behavior and controlled power sequencing are useful. Its wake-up detection can help the interface identify activity from a connected device, while the programmable power-on reset timer supports deterministic system startup. The single-transmitter/single-receiver arrangement matches the verified IO-Link transceiver classification. Final sensor selection must confirm the sensor’s current consumption, communication timing, protection requirements, and compatibility with the integrated regulator topology.
Recommended
24 V Industrial Control Modules
The LT3669EUFD-2#PBF is well suited to compact 24 V industrial control modules because its verified supply range is 7.5 V to 40 V. Integrating the step-down switching regulator and LDO can reduce board-level power-conversion complexity while retaining separate regulation functions for the interface load. The -2 variant’s external catch diode and up-to-300-mA load capability are important design constraints. Use careful input protection, grounding, exposed-pad thermal management, and the manufacturer’s recommended layout in a high-noise industrial enclosure.
Recommended
Distributed Industrial Control Systems
For distributed control systems, the LT3669EUFD-2#PBF can consolidate an IO-Link interface and local power regulation in a sensor or actuator node. The 7.5 V to 40 V operating range supports industrial supply environments, and wake-up detection plus the adjustable transmitter functions support communication and line-driver tuning. The component does not replace the external protection, connector, cable, or system controller; it provides the interface and integrated power functions. Verify grounding, isolation requirements, fault recovery, and timing in the complete system design.
Recommended
Industrial Sensor Hubs
The LT3669EUFD-2#PBF can be used in a sensor hub that powers and communicates with an IO-Link endpoint while minimizing duplicated interface circuitry. The integrated switching regulator and LDO provide two distinct power-conversion functions in one package, and the programmable power-on reset timer helps coordinate startup between the hub and attached sensor. The external catch diode required by the LT3669-2 must be included in the hub’s bill of materials. Confirm output capacitance, load transients, and exposed-pad thermal performance using the official datasheet.
Recommended
Recommended Products Summary
Engineering reference data for LT3669EUFD-2#PBF — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LT3669EUFD#PBF | LT3669HUFD#PBF | LT3669IUFD#PBF |
|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | QFN-28, 4 mm x 5 mm | QFN-28 | QFN-28 | QFN-28 |
| Protocol | IO-Link | IO-Link | IO-Link | IO-Link |
Key Differentiators
- Higher stated switching-regulator load capability (vs LT3669EUFD#PBF)
- External catch-diode implementation (vs LT3669EUFD#PBF)
- Extended-temperature family option (vs LT3669EUFD-2#PBF)
Design Notes
The LT3669-2 version requires an external catch diode, unlike the LT3669 integrated-catch-diode version. Select the diode and implement its connection and loop geometry according to the Analog Devices datasheet. Because the verified product-page comparison states up to 300 mA switching-regulator load current for LT3669-2, validate the diode rating, switching-node layout, inductor, output capacitance, and attached-device load transients together rather than treating the current figure as a standalone guarantee.
The 28-QFN package includes an exposed thermal region, and the supplied data does not provide a verified thermal-resistance value. Use the manufacturer’s land pattern and thermal-layout guidance, provide as much uninterrupted ground-plane copper as practical, and estimate junction temperature from actual dissipation, ambient temperature, and the verified or measured thermal path. Do not invent a thermal figure; validate the final board in the intended industrial enclosure.
Keep the IO-Link communication path, transmitter/receiver connections, regulator switching node, and power-return paths short and controlled. Place input and output decoupling capacitors close to their associated pins, route high-current paths with adequate copper width, and keep sensitive nodes away from the switching node. The verified data confirms a 28-QFN 4 mm x 5 mm package but does not reproduce the complete pin map, so use the official datasheet for exact pin placement and exposed-pad connection.
Do not substitute LT3669EUFD#PBF for LT3669EUFD-2#PBF without reviewing the catch-diode architecture and load-current requirements. The verified Analog Devices comparison states that LT3669 integrates the catch diode and is rated up to 100 mA, while LT3669-2 uses an external catch diode and supports up to 300 mA. Also verify the connected IO-Link device’s current, wake-up behavior, timing, protection, and cable environment before releasing the PCB.
Compliance Information
The supplied verified data identifies the part and provides product-page and distributor references, but it does not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. The #PBF suffix is preserved exactly, but its compliance meaning is not inferred without an authoritative declaration.
