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Analog Devices Inc. LT1790BCS6-3.3#TRMPBF
- Part No.:
- LT1790BCS6-3.3#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LT1790BCS6-3.3#TRMPBF.pdf
- Description:
- IC VREF SERIES 0.1% TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,008
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Product details
Overview
LT1790BCS6-3.3#TRMPBF from Analog Devices (formerly Linear Technology) is a micropower, low-dropout, 3.3V series voltage reference in a 6-lead TSOT-23 package. It delivers ±0.1% initial accuracy, 25ppm/°C max temperature coefficient, 60µA max supply current, and operates from –40°C to 125°C. It is used in precision data acquisition systems requiring stable excitation for 3.3V ADCs and DACs.
For engineers reviewing the LT1790BCS6-3.3#TRMPBF datasheet, LT1790BCS6-3.3#TRMPBF pinout, LT1790BCS6-3.3#TRMPBF application, or LT1790BCS6-3.3#TRMPBF equivalent, key selection criteria include output accuracy over temperature, dropout voltage at 5mA sink/source, thermal hysteresis performance, and compatibility with low-power battery-operated designs.
Technical Context
The LT1790BCS6-3.3#TRMPBF uses curvature-compensated bandgap architecture with post-package trimming to achieve tight initial accuracy and low drift. Its internal design supports bidirectional current flow-sourcing up to 5mA and sinking up to 3mA-enabling use as both positive and negative voltage references without external components.
It features guaranteed operation across –40°C to 125°C, with a maximum dropout voltage of 450mV at 3mA sink load and 120mV at 5mA source load. Line regulation is specified at 220ppm/V and load regulation at 250ppm/mA (source), ensuring stability under varying input and load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3V ±0.1% (±3.3mV) at 25°C - enables direct interface with 3.3V logic and analog signal chains |
| Temp Coefficient | 25ppm/°C max (–40°C to 85°C) - ensures ≤±82.5ppm drift over industrial range |
| Supply Current | 60µA max - supports >10-year battery life in µA-level portable instrumentation |
| Dropout Voltage | 450mV max at 3mA sink - allows operation with VIN as low as 3.75V while maintaining regulation |
| Operating Range | –40°C to 125°C - qualified for automotive under-hood and industrial control environments |
| Thermal Hysteresis | 40ppm typical (–40°C to 85°C) - minimizes calibration drift after thermal cycling |
| Output Noise | 67µVRMS (10Hz–1kHz) - suitable for 16-bit+ precision measurement front-ends |
Pinout & Package
LT1790BCS6-3.3#TRMPBF is housed in a 6-lead Plastic TSOT-23 package (1mm profile), marked "LTXW", with exposed pad not connected. Pin 1 is top-left when notch faces up.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VIN | Input supply terminal - accepts 3.8V to 18V; minimum headroom defined by dropout spec |
| 2 | GND | Analog ground reference - must be low-impedance connection to minimize noise coupling |
| 3 | DNC | Do Not Connect - internally unconnected; floating or tied to GND has no effect |
| 4 | VOUT | Regulated 3.3V output - sources/sinks current; requires ≥1µF ceramic bypass capacitor |
| 5 | GND | Second ground terminal - improves PSRR and thermal stability via dual-path grounding |
| 6 | DNC | Do Not Connect - internally unconnected; no routing or termination required |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional current capability | Sources 5mA / sinks 3mA - enables single-device ±3.3V reference generation without external op-amps |
| Curvature-compensated bandgap | 25ppm/°C max TC - achieves high stability without external trimming resistors |
| Post-package trimming | ±0.1% initial accuracy - eliminates need for system-level calibration in many applications |
| Low thermal hysteresis | 40ppm typical - preserves long-term measurement repeatability after environmental cycling |
| Wide supply range | 3.8V to 18V input - supports direct connection to unregulated battery rails or DC-DC outputs |
Applications
| Handheld Precision Meters | Negative Reference Generation |
|---|---|
Use Scenario: Portable multimeters and clamp meters requiring stable 3.3V reference for 24-bit sigma-delta ADCs. IC Role / Device Role / Timing Role: Primary voltage reference for ADC excitation and DAC output scaling. Use Value: 60µA supply current extends battery life beyond 5 years; ±0.1% accuracy avoids factory recalibration. | Use Scenario: Industrial sensor transmitters needing –3.3V bias for differential amplifiers and bridge sensors. IC Role / Device Role / Timing Role: Negative voltage reference configured with external resistor network and op-amp buffer. Use Value: Identical TC and noise performance as positive mode - eliminates dual-reference component count. |
| Industrial Data Acquisition | Battery-Operated IoT Nodes |
Use Scenario: Modular DAQ modules with multiple 3.3V ADC channels operating across –40°C to 85°C ambient. IC Role / Device Role / Timing Role: Local reference per channel to reject PCB trace resistance and crosstalk. Use Value: Guaranteed 125°C operation ensures reliability in enclosed enclosures; 450mV dropout allows use with buck converter outputs. | Use Scenario: Wireless sensor nodes powered by coin cells or energy harvesters delivering <100µA average current. IC Role / Device Role / Timing Role: Low-power reference for ultra-low-duty-cycle analog sensing bursts. Use Value: 35µA typical supply current enables microamp-level sleep modes; 700µs turn-on time aligns with fast wake-up MCU sequences. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADR3433ARJZ-R7 | 20ppm/°C max TC, 45µA max supply current, 3.3V output, SOT-23-5 package | Single-supply only (no sink capability); lower noise (35µVRMS) but no negative reference option | Select when lowest possible drift and noise are prioritized over bidirectional operation |
| REF3333AIDBVR | 30ppm/°C max TC, 4.5µA typical supply current, 3.3V output, SOT-23-3 package | Ultra-low power but limited to 1mA source; no sink capability; narrower temp range (–40°C to 125°C not guaranteed) | Select for energy-harvesting applications where sub-10µA quiescent current outweighs accuracy requirements |
Compared with ADR3433ARJZ-R7 and REF3333AIDBVR, the LT1790BCS6-3.3#TRMPBF uniquely supports bidirectional current flow and maintains full specification across –40°C to 125°C, making it optimal for ruggedized industrial and automotive sensor interfaces where polarity flexibility and extended temperature compliance are mandatory.
Availability
LT1790BCS6-3.3#TRMPBF is available at Aetrix Electronics and suitable for handheld instruments, industrial data acquisition systems, and battery-operated equipment requiring stable component supply and long-term calibration integrity.
Supply support for LT1790BCS6-3.3#TRMPBF 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 acquired Linear Technology in 2017 and continues its legacy of high-performance analog ICs, with emphasis on precision, power efficiency, and reliability.
The LT1790 family was designed for micropower, high-accuracy voltage referencing in space-constrained, battery-sensitive applications - especially where low dropout, wide temperature range, and bidirectional operation are critical.
FAQ
What is the guaranteed operating temperature range for LT1790BCS6-3.3#TRMPBF?
The LT1790BCS6-3.3#TRMPBF is guaranteed functional from –40°C to 125°C. Its specifications-including ±0.1% initial accuracy and 25ppm/°C temperature coefficient-are fully characterized over the 0°C to 70°C commercial range (denoted by 'C' grade), with extended operation validated across the full –40°C to 125°C range.
Can LT1790BCS6-3.3#TRMPBF be used as a negative voltage reference?
Yes, the LT1790BCS6-3.3#TRMPBF can operate as a negative voltage reference by connecting VOUT to system ground and using VIN as the negative output node. It maintains identical accuracy, temperature coefficient, and noise performance in negative mode, supporting configurations like –3.3V for precision op-amp biasing or bridge sensor excitation.
What is the minimum input voltage required for LT1790BCS6-3.3#TRMPBF to regulate at full load?
At 5mA source load, the LT1790BCS6-3.3#TRMPBF requires a minimum input voltage of 3.42V (3.3V + 120mV dropout). At 3mA sink load, minimum VIN is 3.75V (3.3V + 450mV dropout). These values assume ∆VOUT ≤ 0.1%; derating is recommended for margin in production designs.
Does LT1790BCS6-3.3#TRMPBF require an external capacitor on VOUT?
Yes, a minimum 1µF ceramic capacitor is required on VOUT for stability and noise reduction. The datasheet specifies CL = 1µF for all electrical characteristics, including load regulation, noise, and transient response. Lower capacitance may cause oscillation or degraded PSRR, especially under dynamic load conditions.
How does the thermal hysteresis of LT1790BCS6-3.3#TRMPBF affect long-term calibration?
The LT1790BCS6-3.3#TRMPBF exhibits 40ppm typical hysteresis over –40°C to 85°C cycling, meaning output voltage may shift up to ±20ppm depending on prior thermal history. This is factored into total error budgets for metrology-grade systems; for most industrial DAQ applications, it remains within acceptable limits without active recalibration.
LT1790BCS6-3.3#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 5 mA
- Tolerance:
- ±0.1%
- Temperature Coefficient:
- 25ppm/°C
- Noise - 0.1Hz to 10Hz:
- 50µVp-p
- Noise - 10Hz to 10kHz:
- 67µVrms
- Voltage - Input:
- 3.8V ~ 18V
- Current - Supply:
- 80µA
- Current - Cathode:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LT1790BCS6-3.3#TRMPBF FAQ
1.How can I place an order for LT1790BCS6-3.3#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1790BCS6-3.3#TRMPBF 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 LT1790BCS6-3.3#TRMPBF reliable?
The price and inventory of LT1790BCS6-3.3#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1790BCS6-3.3#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT1790BCS6-3.3#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1790BCS6-3.3#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1790BCS6-3.3#TRMPBF?
LT1790BCS6-3.3#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1790BCS6-3.3#TRMPBF 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 LT1790BCS6-3.3#TRMPBF?
For technical support, including LT1790BCS6-3.3#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1790BCS6-3.3#TRMPBF requirements.
6.How does Aetrix verify that LT1790BCS6-3.3#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT1790BCS6-3.3#TRMPBF 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 LT1790BCS6-3.3#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT1790BCS6-3.3#TRMPBF?
All LT1790BCS6-3.3#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1790BCS6-3.3#TRMPBF, 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 LT1790BCS6-3.3#TRMPBF part is unused and in its original packaging.
Return procedure for LT1790BCS6-3.3#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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