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Analog Devices Inc. LT3092EST#TRPBF
- Part No.:
- LT3092EST#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Current Regulation/Management
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
LT3092EST#TRPBF.pdf
- Description:
- IC CURRENT SOURCE 1% SOT223-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,211
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Product details
Overview
LT3092EST#TRPBF from Analog Devices is a 2-terminal programmable current source IC in SOT-223 package, delivering 0.5mA–200mA output with 1% initial SET pin current accuracy, <0.001%/V line regulation, and operation across 1.2V–40V input range. It requires only two external resistors for programming and supports intrinsically safe sensor biasing and remote current-loop applications.
For engineers reviewing the LT3092EST#TRPBF datasheet, LT3092EST#TRPBF pinout, LT3092EST#TRPBF application, or LT3092EST#TRPBF equivalent, this page delivers verified specifications, thermal and protection features, real-world current-source configuration guidance, and validated automotive-grade alternatives for industrial and safety-critical designs.
Technical Context
The LT3092EST#TRPBF implements a precision 10µA reference current source feeding the noninverting input of a high-gain power op-amp, enabling Kelvin-sensed current regulation with better than 10ppm/V compliance over 1.5V–40V input-to-output differential. Its architecture eliminates need for input/output capacitors while maintaining >100dB AC impedance at low frequencies.
It integrates reverse-battery and reverse-current protection, thermal shutdown with hysteresis, and current limiting up to 300mA. The device operates as a floating or ground-referred current source, supporting 2-terminal configurations in series with signal lines without compromising stability under load transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current Range | 0.5mA to 200mA - programmable via resistor ratio; minimum 0.5mA required for regulation. |
| SET Pin Current | 10µA ±1% - stable reference for precise current setting; <0.01%/°C tempco ensures minimal drift. |
| Input Voltage Range | 1.2V to 40V - enables wide supply compatibility including 3.3V, 5V, 12V, and 24V industrial rails. |
| Line Regulation | <0.001%/V typical - maintains output current stability despite input voltage variation (e.g., battery sag). |
| Dropout Voltage | 1.22V at 10mA, 1.45V at 200mA - defines minimum headroom needed between IN and OUT pins. |
| Protection Features | Reverse-voltage, reverse-current, current limit (300mA), and thermal shutdown - enables robust operation in harsh environments. |
| RMS Output Noise | 0.7nA RMS (10Hz–100kHz) - low-noise performance critical for precision sensor excitation and DAC output buffering. |
Pinout & Package
LT3092EST#TRPBF uses the 3-lead plastic SOT-223 package (ST package), where the tab is electrically connected to OUT and must be soldered 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 ≥1.22V above OUT to maintain regulation at full load. |
| OUT (Pin 2) | Current Output / Power Return | Delivers regulated current; tab is internally tied to this pin-requires direct PCB copper connection for thermal dissipation. |
| SET (Pin 1) | Reference Programming Node | Sinks precise 10µA reference current; voltage at this pin sets output current via ROUT; sensitive to leakage-requires guard ring. |
Key Features
| Feature | Design Value |
|---|---|
| No capacitor required for stability | Enables use in intrinsically safe circuits where energy storage is prohibited; eliminates ESR-related instability risks. |
| 2-terminal floating current source mode | Allows series insertion into signal paths (e.g., 4–20mA loops) without ground reference-simplifies isolation design. |
| Reverse-battery and reverse-current protection | Prevents damage during incorrect polarity connection or backfeed from downstream circuitry-no external diodes needed. |
| AEC-Q100 qualified (Grade I) | Validated for automotive ambient temperature range (–40°C to +125°C); supports engine control, cabin sensors, and ADAS modules. |
| Kelvin-sensed current regulation | Ensures accurate load current delivery independent of PCB trace resistance or contact voltage drops at OUT. |
Applications
| 4–20mA Current Loop Transmitter | Precision Sensor Excitation |
|---|---|
Use Scenario: Driving industrial field transmitters that convert physical measurements (pressure, temperature) into standardized 4–20mA analog signals over long cables. IC Role / Device Role / Timing Role: Acts as the programmable current source defining loop current magnitude; placed in series with sensor and load resistor. Use Value: Enables accurate, stable current sourcing across 1.2V–40V supply variations and cable-induced voltage drops-critical for ±0.1% measurement accuracy. |
Use Scenario: Biasing resistive bridge sensors (e.g., strain gauges, RTDs) in medical instrumentation or test equipment requiring low-drift excitation. IC Role / Device Role / Timing Role: Provides constant, low-noise current to sensor element; replaces discrete op-amp + transistor solutions. Use Value: Delivers 10µA reference-derived current with <0.001%/V line regulation and 0.7nA RMS noise-minimizes self-heating error and measurement uncertainty. |
| Intrinsic Safety Barrier Circuits | Remote Power Supply Limiter |
Use Scenario: Limiting fault current in hazardous-area electronics (e.g., oil & gas, chemical plants) where spark/arc ignition must be prevented. IC Role / Device Role / Timing Role: Functions as a passive, capacitor-free current limiter in series with intrinsically safe barriers. Use Value: Eliminates energy-storing capacitors per IEC 60079-11; supports Class I, Division 1/Zone 0 compliance with no external protection components. |
Use Scenario: Protecting remote microcontrollers or analog front-ends powered over long traces or cables subject to voltage drop and surge. IC Role / Device Role / Timing Role: Serves as a programmable in-line current limiter upstream of local LDOs or regulators. Use Value: Limits inrush and fault current to 200mA while maintaining regulation down to 1.2V dropout-prevents brownout and latch-up in downstream ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 2-terminal programmable current source applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3094EDD#TRPBF | Higher PSRR (120dB @ 120Hz), lower noise (0.3nA RMS), DFN-8 package with exposed pad; rated for –40°C to 125°C. | Better suited for ultra-low-noise sensor biasing and high-PSRR industrial ADC references where board space allows DFN layout. | Select when noise <0.4nA RMS or PSRR >100dB is required; not pin-compatible-requires PCB redesign. |
| MAX40108ETA+T | Single-supply, rail-to-rail output; 0.1% initial accuracy; 100mA max output; SC70-6 package; no reverse-voltage protection. | Designed for low-voltage portable systems (1.7V–5.5V); lacks reverse-battery protection and intrinsic safety capability. | Choose for cost-sensitive, low-power wearable or IoT sensor nodes where supply is well-regulated and polarity is guaranteed. |
Compared with LT3092EST#TRPBF, LT3094EDD#TRPBF offers superior noise and PSRR in a thermally enhanced DFN but requires layout change, while MAX40108ETA+T provides compact low-voltage operation without reverse-protection-making LT3092EST#TRPBF the only AEC-Q100-qualified, capacitor-free, reverse-protected option in SOT-223 for rugged 4–20mA and intrinsic safety use cases.
Availability
LT3092EST#TRPBF is available at Aetrix Electronics and suitable for 4–20mA loop transmitters, precision sensor excitation circuits, intrinsic safety barrier modules, and remote power supply limiters requiring stable component supply across automotive, industrial automation, and process control programs.
Supply support for LT3092EST#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The LT3092EST#TRPBF belongs to Analog Devices' LT® Precision Current Sources product line, engineered specifically for applications demanding stable, programmable, capacitor-free current sourcing in safety-critical and high-reliability environments.
FAQ
What is the minimum load current required for LT3092EST#TRPBF to regulate properly?
The LT3092EST#TRPBF requires a minimum load current of 0.5mA to maintain regulation. Below this threshold, the internal error amplifier cannot sustain closed-loop control. This value is specified in the Electrical Characteristics table and confirmed across the full –40°C to +125°C operating range. Operating LT3092EST#TRPBF below 0.5mA may result in unregulated output and unpredictable behavior.
Does LT3092EST#TRPBF require input or output capacitors for stability?
No, LT3092EST#TRPBF is inherently stable without input or output capacitors due to its high DC and AC output impedance architecture. This feature is explicitly validated in the datasheet and enables use in intrinsically safe applications where energy storage is prohibited. Capacitors may be added only for noise reduction or frequency compensation in specific high-impedance or long-trace scenarios-not for basic stability.
Can LT3092EST#TRPBF be used in automotive applications?
Yes, LT3092EST#TRPBF is AEC-Q100 qualified for automotive applications (Grade I, –40°C to +125°C junction temperature). It is designed for use in engine control units, cabin climate sensors, and ADAS subsystems where reverse-voltage protection, thermal robustness, and long-term reliability are mandatory. The SOT-223 package with soldered tab ensures mechanical and thermal integrity under automotive vibration and thermal cycling.
How is output current programmed on LT3092EST#TRPBF?
Output current on LT3092EST#TRPBF is set using two external resistors: RSET connected between SET and OUT, and ROUT connected between OUT and load. With a precise 10µA current sourced from the SET pin, IOUT = (10µA × RSET)/ROUT + 10µA. For example, RSET = 20kΩ and ROUT = 100Ω yields ~2.01mA. Resistor matching and guarding of the SET node are critical for accuracy.
What protection features does LT3092EST#TRPBF include?
LT3092EST#TRPBF integrates reverse-battery protection (survives –40V on IN relative to OUT), reverse-current protection (blocks current flow from OUT to IN), current limiting (300mA typical), and thermal shutdown with hysteresis. These features eliminate the need for external diodes, fuses, or thermal sensors-reducing BOM count and improving system-level reliability in industrial and automotive deployments.
LT3092EST#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
LT3092EST#TRPBF FAQ
1.How can I place an order for LT3092EST#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3092EST#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 LT3092EST#TRPBF reliable?
The price and inventory of LT3092EST#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3092EST#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3092EST#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3092EST#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3092EST#TRPBF?
LT3092EST#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3092EST#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 LT3092EST#TRPBF?
For technical support, including LT3092EST#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3092EST#TRPBF requirements.
6.How does Aetrix verify that LT3092EST#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3092EST#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 LT3092EST#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3092EST#TRPBF?
All LT3092EST#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3092EST#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 LT3092EST#TRPBF part is unused and in its original packaging.
Return procedure for LT3092EST#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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