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Analog Devices Inc. LT3092EST#PBF
- Part No.:
- LT3092EST#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Current Regulation/Management
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
LT3092EST#PBF.pdf
- Description:
- IC CURRENT SOURCE 1% SOT223-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,568
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Product details
Overview
LT3092EST#PBF from Analog Devices is a 2-terminal programmable current source IC delivering 0.5mA–200mA output with ±1% initial SET pin current 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 LT3092EST#PBF datasheet, LT3092EST#PBF pinout, LT3092EST#PBF application, or LT3092EST#PBF equivalent, key selection factors include its 2-terminal floating topology, reverse-voltage/reverse-current protection, dropout voltage behavior at 200mA, thermal shutdown threshold, and SOT-223 package thermal resistance (θJA = 24°C/W).
Technical Context
The LT3092EST#PBF implements a precision 10µA reference current source feeding the noninverting input of a power op-amp, enabling Kelvin-sensed current regulation. Its architecture achieves better than 10ppm/V current regulation from 1.5V to 40V input-to-output differential.
It supports both GND-referred and floating 2-terminal configurations, with internal protection including reverse-battery protection, reverse-current blocking, current limiting (200mA min), and thermal shutdown with hysteresis. The SOT-223 package exposes the tab as OUT, requiring direct PCB soldering for thermal and electrical integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current Range | 0.5mA to 200mA - set by resistor ratio relative to internal 10µA reference; minimum load required for regulation |
| Input Voltage Range | 1.2V to 40V - defines usable headroom; dropout increases with load current (1.45V typ @ 200mA) |
| SET Pin Current Accuracy | ±1% initial tolerance - enables precise current programming without calibration; low tempco ensures stability over –40°C to 125°C |
| Line Regulation | <0.001%/V - translates to <2nA/V drift; critical for stable bias in varying supply environments |
| Current Regulation | >10ppm/V - maintains output current within 100ppm error across full 1.5–40V VIN–VOUT range |
| Thermal Resistance θJA | 24°C/W - measured on standard 2-layer PCB; tab must be soldered to large copper area for rated performance |
| Protection Features | Reverse-voltage, reverse-current, current limit, thermal shutdown - eliminates need for external protection components in harsh environments |
Pinout & Package
LT3092EST#PBF uses the 3-lead plastic SOT-223 package (ST package). The exposed tab is electrically connected to OUT and must be soldered directly to the PCB's OUT copper pour for thermal and electrical performance. Pin 1 (NC) is unconnected; Pin 2 is OUT; Pin 3 is IN; SET function is implemented internally-no dedicated SET pin in this variant. The device operates as a true 2-terminal device: current flows between IN and OUT, with regulation referenced to OUT.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (NC) | No Connection | Internally unconnected; may be left floating, tied to OUT, or grounded-no functional impact |
| Pin 2 (OUT) | Power Output / Reference Node | Source/sink terminal for regulated current; also serves as voltage reference for internal error amplifier; tab is bonded to this pin |
| Pin 3 (IN) | Power Input | Supplies bias and load current; must be ≥1.2V above OUT to maintain regulation; voltage headroom determines dropout compliance |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-free operation | Stable without input/output bypass caps-enables use in intrinsically safe systems where energy storage is prohibited |
| 2-terminal floating topology | Eliminates ground reference dependency-allows series insertion into signal lines (e.g., 4–20mA loops) without breaking isolation |
| Reverse-voltage protection | Withstands –40V on IN relative to OUT-prevents damage during battery reversal or wiring faults in field installations |
| Programmable via resistor ratio | Output current = 10µA × (RSET/ROUT) + 10µA-enables wide-range tuning with matched-TC resistors for temperature-stable performance |
| AEC-Q100 qualified | Rated for automotive-grade reliability (–40°C to 125°C junction)-validates robustness for under-hood and ADAS sensor biasing |
Applications
| 4–20mA Current Loop Transmitter | Industrial Temperature Sensor Bias |
|---|---|
Use Scenario: Powering and biasing RTD/thermistor bridges in hazardous-area process instrumentation with galvanic isolation. IC Role / Device Role / Timing Role: 2-terminal floating current source providing excitation current while maintaining loop compliance and intrinsic safety certification. Use Value: Eliminates need for isolated DC-DC converter or optocoupler feedback; 1.2V–40V input range accommodates wide loop supply variations (e.g., 12–36V). | Use Scenario: Supplying precise, stable bias current to platinum RTD elements in refinery or chemical plant monitoring systems. IC Role / Device Role / Timing Role: GND-referred current source delivering 1mA or 200µA excitation with <0.001%/V line regulation to minimize self-heating errors. Use Value: ±1% SET current accuracy and 10ppm/V regulation ensure ≤0.1°C measurement uncertainty over full industrial temperature range. |
| Remote Load Current Limiter | Intrinsic Safety Barrier Circuit |
Use Scenario: Protecting downstream analog front-ends (e.g., ADC inputs, op-amp sensors) from overcurrent in distributed control systems. IC Role / Device Role / Timing Role: In-line current limiter placed between power rail and sensitive circuitry; regulates fault current to ≤200mA independent of input voltage. Use Value: Integrated current limit and thermal shutdown replace discrete FET+sense+comparator solutions-reducing BOM count and board space by >60%. | Use Scenario: Implementing energy-limited current sources in Zone 0/1 explosive atmospheres per IEC 60079-11. IC Role / Device Role / Timing Role: Primary current source in entity-parameter-compliant barrier, leveraging capacitor-free operation and reverse-protection. Use Value: No external capacitors required-eliminates spark/arc risk from stored energy; 24°C/W θJA enables safe power dissipation up to 1.2W with proper copper area. |
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 |
|---|---|---|---|
| LT3092ITS8#PBF | Same core functionality but in 8-lead TSOT-23 package; higher θJA (57°C/W); no exposed tab | Better suited for space-constrained PCBs where thermal mass is less critical; lacks tab-based thermal path | Select when footprint size is primary constraint and power dissipation remains ≤0.5W |
| LM334Z/NOPB | 3-terminal adjustable current source; requires external bias; no reverse-voltage protection; 10µA–10mA range only | Limited to low-current biasing (e.g., op-amp input bias); unsuitable for 200mA loads or harsh-wiring environments | Choose only for cost-sensitive, low-power (<10mA), non-automotive designs where protection and headroom are not required |
Compared with LT3092ITS8#PBF, the LT3092EST#PBF offers superior thermal performance and mechanical robustness via its soldered tab, while LM334Z/NOPB lacks integrated protection and high-current capability-making LT3092EST#PBF the sole choice for industrial 4–20mA and intrinsic safety applications demanding 200mA and reverse-fault resilience.
Availability
LT3092EST#PBF is available at Aetrix Electronics and suitable for industrial process control, hazardous-area instrumentation, and automotive sensor biasing requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.
Supply support for LT3092EST#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT3092EST#PBF belongs to Analog Devices' precision current source product line, engineered specifically for ruggedized 2-terminal biasing in safety-critical and high-reliability applications such as intrinsic safety barriers and 4–20mA transmitters.
FAQ
What is the maximum continuous output current of the LT3092EST#PBF?
The LT3092EST#PBF delivers a guaranteed minimum current limit of 200mA under all operating conditions, with typical current limit reaching 300mA. This rating is validated across the full –40°C to 125°C junction temperature range and is enforced by internal current-limit circuitry that activates before thermal shutdown. The LT3092EST#PBF maintains regulation down to 0.5mA, making it suitable for both high-current limiting and precision low-current biasing applications.
Does the LT3092EST#PBF require input or output capacitors for stability?
No, the LT3092EST#PBF is inherently stable without input or output capacitors due to its high DC and AC impedance design-this is a core feature enabling its use in intrinsically safe applications where energy storage is prohibited. However, if a capacitor is added across the SET resistor (e.g., for noise reduction), external frequency compensation (e.g., series RC network) becomes necessary to maintain loop stability. The LT3092EST#PBF datasheet provides specific guidance on compensation networks for such cases.
How is output current programmed on the LT3092EST#PBF?
Output current on the LT3092EST#PBF is programmed using two external resistors: RSET sets a reference voltage (VSET = 10µA × RSET), and ROUT converts that voltage into output current (IOUT = VSET/ROUT + 10µA). The LT3092EST#PBF leverages an internal 10µA current source with ±1% initial accuracy, so total output accuracy depends on resistor tolerance and matching temperature coefficients. For best results, use same-material resistors with tight tolerance (e.g., 0.1%) and low TCR.
What thermal considerations apply to the LT3092EST#PBF in SOT-223 package?
The LT3092EST#PBF in SOT-223 has θJA = 24°C/W and θJC = 15°C/W, but these values assume the exposed tab (Pin 2/OUT) is fully soldered to a large copper pour. Failure to connect the tab reduces thermal performance significantly-potentially increasing junction temperature by >40°C at 1W dissipation. For reliable operation at 200mA with 5V dropout (1W), ≥4 cm² of 2-oz copper connected to the tab is recommended. Thermal shutdown activates at TJ ≈ 160°C with hysteresis.
Is the LT3092EST#PBF suitable for automotive applications?
Yes-the LT3092EST#PBF is AEC-Q100 qualified for automotive applications (Grade I, –40°C to 125°C), with 100% tested performance across the full temperature range. It includes reverse-battery protection (±40V on IN relative to OUT), reverse-current blocking, and thermal shutdown with hysteresis-critical for under-hood reliability. The LT3092EST#PBF is commonly deployed for biasing oxygen sensors, pressure transducers, and radar module current references in ADAS and powertrain systems.
LT3092EST#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
LT3092EST#PBF FAQ
1.How can I place an order for LT3092EST#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3092EST#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 LT3092EST#PBF reliable?
The price and inventory of LT3092EST#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3092EST#PBF is usually 5 days.
3.What payment methods are accepted for LT3092EST#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3092EST#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3092EST#PBF?
LT3092EST#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3092EST#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 LT3092EST#PBF?
For technical support, including LT3092EST#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3092EST#PBF requirements.
6.How does Aetrix verify that LT3092EST#PBF is sourced from the original manufacturer or authorized distributors?
All LT3092EST#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 LT3092EST#PBF meets industry standards.
7.What is the process for return or replacement of LT3092EST#PBF?
All LT3092EST#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3092EST#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 LT3092EST#PBF part is unused and in its original packaging.
Return procedure for LT3092EST#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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