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Analog Devices Inc. LT1790BCS6-1.25#TRMPBF
- Part No.:
- LT1790BCS6-1.25#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LT1790BCS6-1.25#TRMPBF.pdf
- Description:
- IC VREF SERIES 0.1% TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,096
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Product details
Overview
LT1790BCS6-1.25#TRMPBF from Analog Devices (formerly Linear Technology) is a B-grade micropower low-dropout series voltage reference delivering 1.25V output with ±0.1% initial accuracy, 25ppm/°C max temperature coefficient, and 60µA max supply current in a 6-lead TSOT-23 package. It operates from 2.6V to 18V input and supports both sourcing and sinking up to 5mA, enabling use as a precision negative reference in battery-powered instrumentation.
For engineers reviewing the LT1790BCS6-1.25#TRMPBF datasheet, LT1790BCS6-1.25#TRMPBF pinout, LT1790BCS6-1.25#TRMPBF application, or LT1790BCS6-1.25#TRMPBF equivalent, key selection criteria include guaranteed operation from –40°C to 125°C, low thermal hysteresis (40ppm), sub-100mV dropout at 5mA source, and compatibility with 1µF output capacitance for stability in portable data acquisition systems.
Technical Context
The LT1790BCS6-1.25#TRMPBF employs curvature-compensated bandgap architecture with post-package trimming of thin-film resistors to achieve tight initial accuracy and low drift. Its dual-current capability (source/sink) enables bidirectional operation without external components, supporting both positive and negative reference configurations.
It features integrated ESD protection, operates down to 1.95V input at zero load, and maintains stable regulation across line (50–220 ppm/V), load (100–250 ppm/mA), and temperature variations-critical for high-resolution ADC/DAC biasing where reference error directly limits system ENOB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.25V ±0.1% (±1.25mV) - ensures ≤0.1% full-scale error in 12-bit systems without calibration |
| Temp Coefficient | 25ppm/°C max - contributes ≤300ppm (0.03%) drift over –40°C to 85°C industrial range |
| Supply Current | 60µA max - enables >10-year battery life in 10µA sleep-mode sensor nodes |
| Dropout Voltage | 100mV at 5mA source - allows operation from 1.35V supply, critical for single-cell Li-ion systems |
| Line Regulation | 220ppm/V max - limits output shift to <275µV over 1.25V input change (e.g., battery discharge) |
| Load Regulation | 250ppm/mA max - holds output within ±1.25mV under 5mA dynamic load variation |
| Operating Temp | –40°C to 125°C - qualified for under-hood automotive and industrial control environments |
Pinout & Package
LT1790BCS6-1.25#TRMPBF uses a 6-lead ThinSOT™ (TSOT-23) package with 1mm profile, optimized for space-constrained PCBs. Pin 1 is VOUT, Pin 2 is DNC (do not connect), Pin 3 is VIN, Pin 4 is GND, Pin 5 is GND, Pin 6 is DNC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Reference output | Delivers regulated 1.25V; requires ≥1µF ceramic capacitor to ground for stability |
| DNC (Pin 2) | No-connect terminal | Must remain unconnected; no internal circuitry attached |
| VIN (Pin 3) | Input supply | Accepts 2.6V–18V; dropout as low as 100mV enables ultra-low-voltage operation |
| GND (Pin 4) | Ground reference | Primary ground return path; connects to system analog ground plane |
| GND (Pin 5) | Secondary ground | Reduces thermal resistance and improves PSRR by providing parallel ground path |
| DNC (Pin 6) | No-connect terminal | Must remain unconnected; no internal circuitry attached |
Key Features
| Feature | Design Value |
|---|---|
| Curvature-compensated bandgap | Enables 25ppm/°C max drift without external compensation networks |
| Post-package trimming | Guarantees ±0.1% output accuracy after soldering, eliminating board-level calibration |
| Bidirectional current capability | Sinks or sources up to 5mA, enabling direct use as –1.25V reference without op-amp inversion |
| Low thermal hysteresis | 40ppm max over –40°C to 85°C cycling - preserves measurement repeatability in thermally cycled instruments |
| Wide input range | Operates from 2.6V to 18V - supports single-cell Li-ion (3.0V min) and industrial 12V rails without LDO pre-regulation |
Applications
| Handheld Instruments | Negative Voltage References |
|---|---|
Use Scenario: Portable multimeter requiring stable 1.25V reference for 16-bit sigma-delta ADC. IC Role / Device Role / Timing Role: Primary voltage reference for ADC VREF input, directly setting full-scale range. Use Value: 60µA supply current extends alkaline battery life to >2 years; 25ppm/°C drift prevents recalibration during field use. | Use Scenario: Precision op-amp circuit needing accurate –1.25V bias for rail-to-rail signal conditioning. IC Role / Device Role / Timing Role: Sinking-mode negative reference, connected between op-amp inverting input and system ground. Use Value: Eliminates need for dual-supply op-amps or charge-pump ICs, reducing BOM count and layout area by 30%. |
| Industrial Control Systems | Data Acquisition Systems |
Use Scenario: 4–20mA transmitter module operating in –40°C to 85°C ambient with 12V loop supply. IC Role / Device Role / Timing Role: Reference for DAC generating precise current-setting voltage across sense resistor. Use Value: Guaranteed 125°C junction operation ensures reliability in enclosed enclosures; 220ppm/V line regulation maintains accuracy despite 12V supply ripple. | Use Scenario: Isolated analog input card digitizing ±10V sensor signals using 24-bit delta-sigma ADC. IC Role / Device Role / Timing Role: Low-noise (22µVP-P) reference for ADC's internal PGA and reference buffer. Use Value: 0.1Hz–10Hz noise of 22µVP-P contributes <0.001% error in 10V full-scale, preserving effective resolution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADR3412ARJZ-R7 | 1.2V output, ±0.1% initial accuracy, 30ppm/°C drift, 120µA supply current | Lower output voltage limits use in 1.25V-specific circuits (e.g., REF pin of certain ADCs); higher quiescent current reduces battery life | Select when 1.2V suffices and wider supply voltage range (up to 5.5V) is needed |
| MAX6126AASA12+ | 1.2V output, ±0.06% initial accuracy, 10ppm/°C drift, 85µA supply current, SO-8 package | Higher accuracy and lower drift but larger SO-8 footprint and 25µA higher supply current; no sink capability | Select when ultimate precision is required and board space allows SO-8; avoid if bidirectional operation is needed |
Compared with ADR3412ARJZ-R7 and MAX6126AASA12+, the LT1790BCS6-1.25#TRMPBF uniquely combines 1.25V output, sink/source capability, and TSOT-23 size-enabling compact, low-power, bipolar-reference designs where alternatives require voltage translation or external amplification.
Availability
LT1790BCS6-1.25#TRMPBF is available at Aetrix Electronics and suitable for handheld instruments, industrial control systems, data acquisition modules, and battery-operated equipment requiring stable component supply across extended temperature ranges.
Supply support for LT1790BCS6-1.25#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 maintains its precision analog portfolio, renowned for high-performance voltage references, amplifiers, and power management ICs.
The LT1790 family was designed specifically for micropower, low-drift voltage referencing in space- and energy-constrained systems-emphasizing post-trim accuracy, wide temperature operation, and bidirectional current handling without external components.
FAQ
What is the maximum load current the LT1790BCS6-1.25#TRMPBF can source while maintaining regulation?
The LT1790BCS6-1.25#TRMPBF guarantees regulation up to 5mA source current with ≤0.1% output deviation, as verified by load regulation spec of 250ppm/mA max. At 5mA, total error remains within ±1.25mV. Exceeding this may cause dropout or increased drift, especially at high temperature.
Does the LT1790BCS6-1.25#TRMPBF require an output capacitor, and what value is recommended?
Yes, the LT1790BCS6-1.25#TRMPBF requires a minimum 1µF ceramic capacitor from VOUT to GND for stability, as specified in all typical application circuits. Lower values risk oscillation; tantalum or electrolytic capacitors are not recommended due to ESR sensitivity.
Can the LT1790BCS6-1.25#TRMPBF be used as a negative voltage reference, and how is it configured?
Yes, the LT1790BCS6-1.25#TRMPBF can operate as a negative reference by connecting VIN to system ground and VOUT to –1.25V node while sinking current through an external resistor. This configuration leverages its bidirectional current capability without additional active components.
What is the thermal hysteresis specification for the LT1790BCS6-1.25#TRMPBF, and how does it affect long-term measurements?
The LT1790BCS6-1.25#TRMPBF exhibits 40ppm typical thermal hysteresis over –40°C to 85°C cycling, meaning output voltage may shift up to ±40ppm (±50µV) after extreme temperature excursions. This is critical for metrology-grade instruments requiring repeatable readings across environmental cycles.
Is the LT1790BCS6-1.25#TRMPBF pin-compatible with other members of the LT1790 family, such as the LT1790BCS6-2.5#TRMPBF?
Yes, all LT1790 variants in the TSOT-23-6 package-including LT1790BCS6-1.25#TRMPBF and LT1790BCS6-2.5#TRMPBF-share identical pinout, footprint, and thermal characteristics. Only the output voltage and associated electrical specs differ, enabling drop-in replacement during design iteration.
LT1790BCS6-1.25#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):
- 1.25V
- Voltage - Output (Max):
- -
- Current - Output:
- 5 mA
- Tolerance:
- ±0.1%
- Temperature Coefficient:
- 25ppm/°C
- Noise - 0.1Hz to 10Hz:
- 10µVp-p
- Noise - 10Hz to 10kHz:
- 14µVrms
- Voltage - Input:
- 2.6V ~ 18V
- Current - Supply:
- 75µA
- Current - Cathode:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LT1790BCS6-1.25#TRMPBF FAQ
1.How can I place an order for LT1790BCS6-1.25#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1790BCS6-1.25#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 LT1790BCS6-1.25#TRMPBF reliable?
The price and inventory of LT1790BCS6-1.25#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1790BCS6-1.25#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT1790BCS6-1.25#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1790BCS6-1.25#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1790BCS6-1.25#TRMPBF?
LT1790BCS6-1.25#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1790BCS6-1.25#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 LT1790BCS6-1.25#TRMPBF?
For technical support, including LT1790BCS6-1.25#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1790BCS6-1.25#TRMPBF requirements.
6.How does Aetrix verify that LT1790BCS6-1.25#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT1790BCS6-1.25#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 LT1790BCS6-1.25#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT1790BCS6-1.25#TRMPBF?
All LT1790BCS6-1.25#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1790BCS6-1.25#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 LT1790BCS6-1.25#TRMPBF part is unused and in its original packaging.
Return procedure for LT1790BCS6-1.25#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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