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Analog Devices Inc. LT3092IST#PBF
- Part No.:
- LT3092IST#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Current Regulation/Management
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
LT3092IST#PBF.pdf
- Description:
- IC CURRENT SOURCE 1% SOT223-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,778
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Product details
Overview
LT3092IST#PBF from Analog Devices is a 2-terminal programmable current source IC in 3-lead SOT-223 package, delivering 0.5mA–200mA output with 1% initial SET pin accuracy, <0.001%/V line regulation, and 1.2V–40V input voltage range. It operates without input/output capacitors and is used in intrinsic safety circuits, remote sensor biasing, and precision current limiting for industrial transmitters.
For engineers reviewing the LT3092IST#PBF datasheet, LT3092IST#PBF pinout, LT3092IST#PBF application, or LT3092IST#PBF equivalent, key selection criteria include its 2-terminal floating topology, reverse-voltage/reverse-current protection, Kelvin-sensed current regulation (<10ppm/V), thermal shutdown, and AEC-Q100 qualification for automotive-grade reliability.
Technical Context
The LT3092IST#PBF implements a precision 10µA reference current source feeding the noninverting input of a high-gain power op-amp, enabling resistor-ratio-based current programming. Its architecture achieves >100dB AC impedance and stable operation without external capacitors due to internal compensation and low-output-impedance buffering.
It supports GND-referred, floating, and in-line configurations with dropout as low as 1.22V at 10mA. Protection includes reverse-battery tolerance (±40V on IN relative to OUT), reverse-current blocking, current limiting (200mA min), and thermal shutdown with hysteresis - all integrated without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current Range | 0.5mA to 200mA - set by RSET/ROUT ratio; minimum 0.5mA required for regulation |
| Input Voltage Range | 1.2V to 40V - enables wide-supply compatibility including 3.3V, 5V, 12V, 24V, and 36V industrial rails |
| SET Pin Current Accuracy | ±1% initial tolerance - ensures predictable current programming without calibration |
| Line Regulation | <0.001%/V typical - maintains stable output under varying supply conditions (e.g., battery discharge) |
| Dropout Voltage | 1.22V at 10mA, 1.45V at 200mA - defines minimum headroom needed between IN and OUT |
| Current Regulation | Better than 10ppm/V from 1.5V to 40V - critical for precision loop-powered sensors |
| Protection Features | Reverse-voltage, reverse-current, current limit, thermal shutdown - eliminates need for external protection diodes or fuses |
Pinout & Package
LT3092IST#PBF uses the 3-lead plastic SOT-223 package (ST package), where the tab is internally connected to OUT and must be soldered directly to the PCB's OUT copper pour for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 3) | Power Input | Supplies bias and load current; must be 1.2V–1.45V above OUT depending on load (dropout) |
| OUT (Pin 2) | Power Output / Reference Return | Delivers regulated current; connects to exposed tab for thermal conduction and low-impedance return path |
| SET (Pin 1) | Reference Programming Node | Sinks precise 10µA current; voltage across RSET sets operating point for output current ratio |
Key Features
| Feature | Design Value |
|---|---|
| 2-Terminal Floating Operation | Enables series insertion into signal lines (e.g., 4–20mA loops) without ground reference |
| No Input/Output Capacitors Required | Reduces BOM count and avoids capacitor-related aging, microphonics, or DC bias drift |
| Intrinsic Safety Compliance Ready | Stable without energy-storing capacitors; supports Class I, Div 2 and ATEX Zone 2 designs |
| Reverse-Voltage Protection | Withstands ±40V on IN relative to OUT - prevents damage during wiring errors or battery reversal |
| Resistor-Ratio Current Setting | Eliminates need for precision voltage references or DACs; leverages matched TC resistors for tempco cancellation |
Applications
| 4–20mA Loop Transmitter | Industrial Temperature Sensor Bias |
|---|---|
Use Scenario: Powering and sourcing current for RTD or thermocouple signal conditioning circuitry in field-mounted transmitters. IC Role / Device Role / Timing Role: 2-terminal floating current source providing excitation and loop compliance in 4–20mA analog output stages. Use Value: Enables single-supply, galvanically isolated loop design with <10ppm/V regulation - critical for <0.1%FS accuracy over 24V supply variation. |
Use Scenario: Supplying stable bias current to platinum RTD elements (e.g., PT100) in process control analyzers. IC Role / Device Role / Timing Role: Precision current source referenced to sensor common, rejecting common-mode noise in long cable runs. Use Value: 1% initial SET accuracy and <0.001%/V line regulation minimize self-heating error and span drift across 0–100°C ambient range. |
| Intrinsic Safety Barrier | Automotive Cabin Pressure Sensor |
Use Scenario: Limiting fault current in hazardous-area instrumentation (e.g., oil & gas refineries) to meet IEC 60079-11 energy limits. IC Role / Device Role / Timing Role: In-line current limiter placed between barrier and field device, operating without capacitors to avoid spark energy storage. Use Value: Reverse-current protection and indefinite short-circuit tolerance ensure fail-safe behavior during fault conditions per IS certification requirements. |
Use Scenario: Providing regulated excitation current to piezoresistive pressure sensors in HVAC or airbag systems. IC Role / Device Role / Timing Role: AEC-Q100 qualified current source driving sensor bridge with thermal shutdown and reverse-battery immunity. Use Value: Withstands automotive load-dump (40V) and cold-crank (-18V) events while maintaining ±1% current accuracy over –40°C to 125°C junction temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 2-terminal current source applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3092ETS8#PBF | Same core functionality, but in 8-lead TSOT-23 package with different pinout (IN/IN/NC/SET/NC/NC/OUT/OUT); higher θJA (57°C/W) vs. SOT-223 (24°C/W) | Preferred for space-constrained PCBs where thermal mass is less critical; not drop-in compatible due to pin count and layout | Select when board area is constrained and thermal dissipation ≤0.5W is sufficient; verify routing for dual IN/OUT pins |
| LM334Z/NOPB | 3-terminal adjustable current source (REF/ADJ/OUT); requires external reference voltage; no reverse-voltage protection; max 10mA output | Suitable for low-current lab-grade biasing only; lacks automotive qualification, reverse protection, and 200mA capability | Choose only for sub-10mA non-safety-critical applications where cost is primary; not suitable for loop-powered or industrial use |
Compared with LT3092ETS8#PBF, the LT3092IST#PBF offers superior thermal performance and mechanical robustness in SOT-223, while LM334Z/NOPB lacks essential protections and scalability - making LT3092IST#PBF the only AEC-Q100-qualified, 200mA-capable, capacitor-free solution for demanding industrial and automotive current-source roles.
Availability
LT3092IST#PBF is available at Aetrix Electronics and suitable for 4–20mA loop transmitters, intrinsic safety barriers, and automotive cabin sensor biasing requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LT3092IST#PBF 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
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT3092 product line delivers precision programmable current sources for loop-powered instrumentation, intrinsic safety systems, and sensor excitation - designed specifically for reliability in harsh environments and compliance-critical applications.
FAQ
What is the minimum load current required for LT3092IST#PBF to regulate properly?
The LT3092IST#PBF requires a minimum load current of 0.5mA to maintain regulation. Below this threshold, the device exits regulation mode and output current becomes uncontrolled. This value is specified in the Electrical Characteristics table and confirmed across the full –40°C to 125°C operating temperature range. The LT3092IST#PBF achieves this via internal biasing that depends on sufficient output current flow.
Does LT3092IST#PBF require input or output capacitors for stability?
No, the LT3092IST#PBF is inherently stable without input or output capacitors due to its internal compensation and high-DC-impedance architecture. This is explicitly validated in the datasheet and enables use in intrinsic safety applications where energy storage is prohibited. However, if a capacitor is added across RSET for noise reduction, external frequency compensation (e.g., series RC network) becomes necessary to maintain stability - as detailed in the Applications Information section of the LT3092IST#PBF documentation.
How does reverse-voltage protection work on LT3092IST#PBF?
The LT3092IST#PBF incorporates integrated reverse-voltage protection that blocks current flow when the IN pin is driven negative relative to OUT, up to –40V. This is achieved through internal diode structures and control logic that disable the output stage during reverse polarity events. Unlike external diode solutions, this protection adds no forward voltage drop or power loss during normal operation, preserving the LT3092IST#PBF's low-dropout performance and efficiency.
Can LT3092IST#PBF be used in AEC-Q100 automotive applications?
Yes, the LT3092IST#PBF is AEC-Q100 qualified for automotive applications (Grade I, –40°C to 125°C). It undergoes stress testing for temperature cycling, humidity, ESD, and lifetime reliability per the AEC standard. This qualification covers the full LT3092IST#PBF part number - including its SOT-223 package, internal protection features, and specified electrical parameters - making it suitable for cabin pressure sensors, seat occupancy detection, and other under-hood or interior automotive systems.
What is the purpose of the exposed tab on the LT3092IST#PBF package?
The exposed tab on the LT3092IST#PBF is electrically and thermally connected to the OUT pin. It must be soldered directly to the PCB's OUT copper pour to serve two critical functions: (1) provide low-impedance current return path, minimizing voltage error from trace resistance, and (2) conduct heat from the die to the board, achieving θJA = 24°C/W. Failure to connect the tab degrades both regulation accuracy and thermal performance - a requirement explicitly stated in the Pin Functions section of the LT3092IST#PBF datasheet.
LT3092IST#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- TO-261-4, TO-261AA
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Current Source
- Sensing Method:
- -
- Accuracy:
- ±1%
- Voltage - Input:
- 1.2V ~ 40V
- Current - Output:
- 200mA
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223-3
LT3092IST#PBF FAQ
1.How can I place an order for LT3092IST#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3092IST#PBF 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 LT3092IST#PBF reliable?
The price and inventory of LT3092IST#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3092IST#PBF is usually 5 days.
3.What payment methods are accepted for LT3092IST#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3092IST#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3092IST#PBF?
LT3092IST#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3092IST#PBF 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 LT3092IST#PBF?
For technical support, including LT3092IST#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3092IST#PBF requirements.
6.How does Aetrix verify that LT3092IST#PBF is sourced from the original manufacturer or authorized distributors?
All LT3092IST#PBF 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 LT3092IST#PBF meets industry standards.
7.What is the process for return or replacement of LT3092IST#PBF?
All LT3092IST#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3092IST#PBF, 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 LT3092IST#PBF part is unused and in its original packaging.
Return procedure for LT3092IST#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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