LT3669IUFD#PBF - IO-Link Transceiver with Buck/LDO | Analog Devices
MPN: LT3669IUFD#PBF ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.38 | $5.38 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
LT3669IUFD#PBF Overview
An IO-Link transceiver is the interface between an industrial sensor or actuator and a point-to-point industrial communications link. The LT3669 provides the physical signaling path while integrating power-conversion functions for the connected equipment. This combination can reduce the number of discrete interface and power-supply components in sensor modules, compact control blocks, and industrial field devices.
The LT3669 is designed around three functional blocks identified by Analog Devices: an IO-Link transceiver, a step-down regulator, and an LDO. It also includes wake-up detect functionality and a programmable power-on reset timer. The transmitter current limit and slew rate are externally adjustable, allowing the application to tune communication behavior and power-delivery characteristics. The supplied manufacturer information also identifies the LT3669 family as recommended for new designs.
Typical industrial uses include IO-Link sensor interfaces, proximity and limit sensors, industrial actuator modules, factory automation equipment, and embedded control systems that need local power alongside a communications transceiver. The integrated architecture can simplify board partitioning, but each rail and signal path still requires careful decoupling, grounding, protection, and thermal review. The exact output-current, switching-frequency, dropout, and timing limits are not present in the supplied verified excerpts and must be confirmed from the complete manufacturer datasheet before production design.
When laying out this QFN device, place input, output, and interface decoupling components close to their associated pins, connect the exposed pad to the appropriate thermal and ground plane, and keep sensitive signal routing away from switching-current paths. Verify wake-up and power-on reset timing with the complete electrical specification. The product is available in a tube package according to the verified distributor listing.
This product page combines the verified Analog Devices product information, distributor package and sourcing references, and practical design guidance for engineers evaluating the LT3669 in IO-Link systems.
Drop-in alternatives for LT3669IUFD#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 LT3669IUFD#PBF (same form factor and footprint) — differing in Package, Wake-Up Detect, Integrated Power Functions, Interface Category, RoHS Status.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LT3669IUFD-2#PBF
✅ Drop-In✓ In Stock
$5.38 / Unit
View Datasheet →LT3669IUFD#TRPBF
✅ Drop-In✓ In Stock
$5.38 / Unit
View Datasheet →LT3669EUFD#PBF
✅ Drop-In✓ In Stock
$9.2 / Unit
View Datasheet →LT3669IUFD#PBF
✅ Drop-In✓ In Stock
Contact for price
View Datasheet →LT3669IUFD-2#PBF-ND
✅ Drop-In📋 Reference alternative (not in catalog)
LT3669IUFD#PBF Specifications
| Product Type | IO-Link transceiver with integrated step-down regulator and LDO |
| Supply Voltage Range | 7.5 V to 40 V |
| Operating Temperature Range | -40 C to +125 C |
| Integrated Power Functions | Step-down switching regulator and LDO |
| Communications Function | Industrial IO-Link transceiver |
| Wake-Up Detect | Included |
| Power-On Reset | Programmable timer |
| Transmitter Current Limit | Externally adjustable |
| Transmitter Slew Rate | Externally adjustable |
| Package | 28-pin QFN with exposed pad |
| Package Type | QFN |
| Mounting Style | Surface mount |
| Packaging | Tube |
| Recommended Design Status | Recommended for new designs |
LT3669IUFD#PBF qfn Pin Configuration Guide
Pin configuration for LT3669IUFD#PBF (qfn 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 LT3669IUFD#PBF.
Refer to the datasheet for full pin configuration.
Typical Applications
LT3669IUFD#PBF is suitable for 6 applications: IO-Link Industrial Sensor Interface, Factory Automation Sensor Nodes, Industrial Proximity Sensors, Limit and Position Sensors, Industrial Actuator Modules, Embedded Industrial Control Blocks.
IO-Link Industrial Sensor Interface
The Analog Devices LT3669IUFD#PBF fits an IO-Link sensor node because it combines the physical transceiver with an integrated step-down regulator and LDO. In a sensor module, the IO-Link interface handles the point-to-point communication while the regulator functions provide local power to sensor electronics. The verified 7.5 V to 40 V supply range and -40 C to +125 C operating range are useful for industrial environments, although the exact regulator current, dropout, and timing limits must be confirmed in the complete datasheet. The 28-QFN exposed-pad package also supports compact PCB integration when the land pattern and thermal plane are designed according to the manufacturer drawing.
Recommended
Factory Automation Sensor Nodes
LT3669IUFD#PBF is applicable to compact factory automation nodes where one device must support both an IO-Link connection and local regulated power. Integrating the transceiver, step-down switching regulator, and LDO can reduce the number of separate power and interface blocks in a sensor or actuator module. The verified industrial temperature range of -40 C to +125 C supports harsh operating environments, while the adjustable transmitter current limit and slew rate allow tuning for the connected load and wiring. Designers should still verify EMC behavior, protection strategy, startup timing, and thermal performance against the complete system specification.
Recommended
Industrial Proximity Sensors
The LT3669IUFD#PBF can be used in an IO-Link proximity-sensor assembly where the sensor requires local power and a standardized industrial communication link. The integrated step-down regulator and LDO provide a compact power architecture, while wake-up detect supports interaction with connected equipment. The transmitter current limit and slew rate are externally adjustable, giving the designer controls for tuning the physical interface to the sensor cable and load. Because the supplied verified excerpts do not include the full output-current, regulator-efficiency, or timing tables, final sensor selection must use the complete Analog Devices datasheet and measured system requirements.
Recommended
Limit and Position Sensors
For limit switches, position sensors, and other industrial detection devices, LT3669IUFD#PBF combines an IO-Link transceiver with power-conversion capability in one package. This is useful when the sensor enclosure has limited board area and requires a single interface IC to coordinate communication and local supply rails. The verified 7.5 V to 40 V input range accommodates industrial bus environments, while the programmable power-on reset timer can help define startup behavior for downstream electronics. Check the exact IO-Link timing, output-current limits, fault behavior, and exposed-pad requirements before production release.
Recommended
Industrial Actuator Modules
LT3669IUFD#PBF is suitable for actuator modules that need an IO-Link communication path and regulated local power for control electronics. The integrated regulator and LDO can simplify power partitioning, and the adjustable transmitter current limit and slew rate provide application-level control over the IO-Link output behavior. The wide verified supply range is valuable for industrial systems, but actuator drives may require additional protection, isolation, or high-current switching stages outside the LT3669. Validate the complete electrical specification, thermal design, and fault response for the selected actuator architecture.
Recommended
Embedded Industrial Control Blocks
The Analog Devices LT3669IUFD#PBF can support compact embedded control blocks that connect sensors or actuators over IO-Link while generating local power rails. Its 28-QFN exposed-pad format can reduce board area, but the exposed pad must be connected according to the official package drawing and thermal requirements. Wake-up detection and the programmable power-on reset timer are useful when the system needs deterministic startup behavior. The verified web excerpts identify the device as recommended for new designs, but they do not provide all regulator and transceiver limits; consult the full datasheet before assigning the device to a safety- or production-critical control path.
Recommended
Engineering reference data for LT3669IUFD#PBF — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LT3669IUFD-2#PBF | LT3669IUFD#TRPBF | LT3669EUFD#PBF | LT3669IUFD-2#PBF-ND |
|---|---|---|---|---|---|
| Package | 28-pin QFN with exposed pad | 28-QFN (4x5) exposed pad | QFN-28 exposed pad | QFN-28 exposed pad | 28-WFQFN exposed pad |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
Key Differentiators
- Combines IO-Link communication and local power conversion (vs LT3669IUFD-2#PBF)
- Wide verified industrial supply range (vs LT3669IUFD-2#PBF-ND)
- Programmable startup behavior (vs LT3669EUFD#PBF)
- Verified industrial temperature capability (vs LT3669IUFD#TRPBF)
Design Notes
Use the manufacturer LT3669/LT3669-2 package drawing as the authority for the 28-QFN exposed-pad layout. Place the input, regulator-output, and transceiver decoupling components directly at the relevant pins, keep the exposed-pad connection continuous, and provide thermal vias only in the pattern recommended by Analog Devices. The verified excerpts confirm the exposed-pad package but do not provide the land-pattern dimensions, so do not infer them from a generic QFN footprint.
Thermal analysis must use the actual regulator dissipation, load current, ambient temperature, and exposed-pad thermal data from the complete datasheet. The supplied data confirms a 7.5 V to 40 V supply and -40 C to +125 C environmental range, but it does not provide enough verified numerical data for a valid junction-temperature calculation. Estimate worst-case dissipation only after confirming regulator efficiency and output-load requirements, then verify the board copper and enclosure thermal path.
Keep the IO-Link signal path and its return connection controlled while separating them from high-current switching-regulator paths. External current-limit and slew-rate components should be placed where the datasheet guidance indicates, with short traces and a stable ground reference. Review creepage, clearance, surge protection, and cable-side transient requirements using the applicable industrial system standards; those standards were not identified in the supplied verified data.
Do not treat LT3669IUFD#PBF as a generic IO-Link transceiver without accounting for its integrated power functions, startup timer, wake-up detection, and exposed-pad thermal requirements. Confirm the regulator output current, enable/startup behavior, IO-Link thresholds, current-limit range, and package pin assignments in the official datasheet. Using distributor snippets alone can lead to incorrect external-component values or an invalid production drop-in decision.
Compliance Information
The supplied verified web data does not provide explicit RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals statements. Compliance must be confirmed from the current manufacturer product documentation or the applicable distributor record.
