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Analog Devices Inc. LT3092IST#TRPBF
- Part No.:
- LT3092IST#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Current Regulation/Management
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
LT3092IST#TRPBF.pdf
- Description:
- IC CURRENT SOURCE 1% SOT223-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,113
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Product details
Overview
LT3092IST#TRPBF 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 operation across 1.2V–40V input range. It functions as a floating or ground-referred precision current limiter in sensor biasing, loop-powered transmitters, and intrinsic safety circuits.
For engineers reviewing the LT3092IST#TRPBF datasheet, LT3092IST#TRPBF pinout, LT3092IST#TRPBF application, or LT3092IST#TRPBF equivalent, key selection criteria include its capacitor-free stability, reverse-voltage/reverse-current protection, Kelvin-sensed current regulation (<10ppm/V), thermal shutdown, and AEC-Q100 qualification for automotive use.
Technical Context
The LT3092IST#TRPBF implements a precision 10µA reference current source feeding the noninverting input of a power op-amp, enabling resistor-ratio-based output programming without external capacitors. Its architecture provides high DC/AC impedance and operates stably with no input/output bypass caps.
It features internal reverse-battery and reverse-current protection, current limiting (200mA min), thermal shutdown with hysteresis, and Kelvin-sensed current regulation referenced to the OUT pin. The SET pin delivers 10µA ±1% at 25°C with <0.01%/°C tempco, and dropout voltage remains ≤1.45V at 200mA load.
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 |
| SET Pin Current | 10µA ±1% - stable reference for accurate current programming; low tempco ensures precision over temperature |
| Input Voltage Range | 1.2V to 40V - supports wide supply rails including industrial 24V and automotive 12V/24V systems |
| Line Regulation | <0.001%/V - enables stable current delivery despite input rail fluctuations in noisy environments |
| Dropout Voltage | 1.45V max at 200mA - defines minimum VIN–VOUT headroom needed for full-load regulation |
| Current Regulation | <10ppm/V from 1.5V–40V - ensures minimal output drift under varying input conditions |
| Protection Features | Reverse-voltage, reverse-current, current limit, thermal shutdown - eliminates need for external protection circuitry |
Pinout & Package
LT3092IST#TRPBF uses the 3-lead plastic SOT-223 package (ST package). The exposed tab is internally connected to OUT and must be soldered directly to the PCB's OUT net 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 above OUT to maintain regulation |
| OUT (Pin 2) | Power Output / Reference Return | Delivers regulated current; serves as Kelvin sense point and connects to exposed tab |
| SET (Pin 1) | Reference Programming Node | Sinks precise 10µA current; voltage at this node sets output via ROUT; sensitive to leakage |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-Free Stability | Operates without input/output bypass capacitors - simplifies layout and eliminates ESR-related instability in intrinsically safe designs |
| 2-Terminal Floating Operation | Functions in series with signal lines or remote sensors - enables current sourcing where ground reference is unavailable |
| Kelvin-Sensed Current Regulation | Regulation measured directly at OUT pins - rejects PCB trace resistance errors and ensures accuracy at load |
| Reverse Protection | Withstands reverse battery polarity and reverse current flow - prevents damage during installation or fault conditions |
| AEC-Q100 Qualified | Rated for automotive applications (–40°C to 125°C) - meets stress test requirements for reliability in vehicle ECUs |
Applications
| 4–20mA Loop Transmitter | Industrial Sensor Biasing |
|---|---|
Use Scenario: Provides precise, stable current output for analog field transmitters powering 4–20mA current loops over long cables in factory automation. IC Role / Device Role / Timing Role: Acts as the programmable current source defining loop current magnitude; configured as GND-referenced or floating based on topology. Use Value: Delivers <10ppm/V line regulation and 1% initial accuracy - maintains loop accuracy despite supply ripple and cable voltage drop. | Use Scenario: Supplies excitation current to RTDs, strain gauges, and bridge sensors in PLC I/O modules and condition monitoring systems. IC Role / Device Role / Timing Role: Functions as a low-noise, temperature-stable current source replacing discrete op-amp/resistor solutions. Use Value: 10µA SET current with <0.01%/°C tempco enables <0.1% total error over –40°C to 125°C - critical for high-resolution measurement. |
| Intrinsic Safety Barriers | Automotive LED Current Limiter |
Use Scenario: Used in hazardous-area instrumentation (e.g., oil & gas, chemical plants) where energy-limited current sources prevent ignition sparks. IC Role / Device Role / Timing Role: Serves as a certified intrinsically safe 2-terminal current limiter - operates without energy-storing capacitors per IEC 60079-11. Use Value: No required input/output caps + reverse protection + thermal shutdown meet strict energy storage limits - eliminates need for external Zener barriers. | Use Scenario: Limits current to automotive cabin LEDs, status indicators, and interior lighting in 12V/24V vehicle systems. IC Role / Device Role / Timing Role: Functions as a robust, AEC-Q100 qualified current limiter replacing discrete MOSFET+shunt solutions. Use Value: Reverse-voltage protection withstands jump-start transients; thermal shutdown prevents failure during thermal overload - improves system reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar programmable current source applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3094EDD#TRPBF | Higher accuracy (0.2% initial SET current), lower noise (0.3nARMS), DFN-8 package only | Better suited for precision metrology and low-noise sensor excitation where 0.5mA–200mA range overlaps | Select when sub-0.5% total current error and reduced noise spectral density are required; requires DFN layout |
| LM334Z/NOPB | 3-lead TO-92; 1µA–10mA range; no reverse protection; requires external trim pot for adjustment | Limited to low-current biasing (e.g., op-amp input biasing); not suitable for 200mA loads or harsh environments | Choose only for cost-sensitive, low-power, non-automotive applications where protection and wide range are unnecessary |
Compared with LT3092IST#TRPBF, LT3094EDD#TRPBF offers superior accuracy and noise performance but lacks SOT-223 packaging and automotive qualification, while LM334Z/NOPB provides basic current setting at lower cost but cannot support 200mA loads or survive reverse faults.
Availability
LT3092IST#TRPBF is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive lighting control, and intrinsic safety barrier designs requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.
Supply support for LT3092IST#TRPBF 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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and power management.
The LT3092 product line delivers robust, capacitor-free programmable current sources designed for demanding applications including loop-powered instrumentation, intrinsic safety systems, and automotive sensor excitation.
FAQ
What is the minimum load current required for LT3092IST#TRPBF to regulate properly?
The LT3092IST#TRPBF requires a minimum load current of 0.5mA to maintain regulation. Below this threshold, the device exits regulation mode and output current becomes undefined. This value is specified in the Electrical Characteristics table and confirmed across the full –40°C to 125°C operating temperature range for the I-grade version.
Does LT3092IST#TRPBF require input or output capacitors for stability?
No, LT3092IST#TRPBF is designed to operate stably without input or output capacitors in most configurations. Its high DC/AC impedance and internal compensation eliminate the need for external bypass caps - a key enabler for intrinsic safety and surge-immune applications. Capacitors may be added only for noise reduction or frequency compensation in specific layouts.
How is output current programmed on LT3092IST#TRPBF?
Output current on LT3092IST#TRPBF is programmed using two external resistors: RSET connected between SET and OUT, and ROUT between OUT and load. With a precise 10µA current sourced from the SET pin, IOUT = (10µA × RSET)/ROUT + 10µA. RSET is typically chosen to develop 200mV for optimal offset rejection.
What protection features does LT3092IST#TRPBF include?
LT3092IST#TRPBF integrates reverse-voltage protection, reverse-current protection, current limiting (≥200mA), and thermal shutdown with hysteresis. These features eliminate the need for external diodes, fuses, or thermal sensors in most applications - enhancing reliability and reducing bill-of-materials count.
Is LT3092IST#TRPBF suitable for automotive applications?
Yes, LT3092IST#TRPBF is AEC-Q100 qualified for automotive applications and rated for operation from –40°C to 125°C. It is specifically designed for use in automotive sensor biasing, LED current limiting, and control module current sources where reverse battery tolerance and thermal robustness are essential.
LT3092IST#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- TO-261-4, TO-261AA
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LT3092IST#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3092IST#TRPBF 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#TRPBF reliable?
The price and inventory of LT3092IST#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3092IST#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3092IST#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3092IST#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3092IST#TRPBF?
LT3092IST#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3092IST#TRPBF 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#TRPBF?
For technical support, including LT3092IST#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3092IST#TRPBF requirements.
6.How does Aetrix verify that LT3092IST#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3092IST#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3092IST#TRPBF?
All LT3092IST#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3092IST#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LT3092IST#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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