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Analog Devices Inc. LT6656AIS6-1.25#TRMPBF
- Part No.:
- LT6656AIS6-1.25#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LT6656AIS6-1.25#TRMPBF.pdf
- Description:
- IC VREF SERIES 0.05% TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:947
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Product details
Overview
LT6656AIS6-1.25#TRMPBF from Analog Devices is a precision micropower voltage reference IC delivering 1.25 V output with ±0.05% initial accuracy, 10 ppm/°C max temperature coefficient, and 5 µVpp noise (0.1–10 Hz). It operates from 2.7 V to 18 V supply and draws only 35 µA quiescent current, enabling use in battery-powered instrumentation and high-resolution ADC/DAC biasing.
For engineers reviewing the LT6656AIS6-1.25#TRMPBF datasheet, LT6656AIS6-1.25#TRMPBF pinout, LT6656AIS6-1.25#TRMPBF application, or LT6656AIS6-1.25#TRMPBF equivalent, key selection criteria include initial accuracy, thermal drift, low-noise performance, supply voltage range, and SOT-23-6 package compatibility for space-constrained analog signal chains.
Technical Context
The LT6656AIS6-1.25#TRMPBF employs a buried Zener core with on-chip trimming for high initial accuracy and low drift. Its internal amplifier provides rail-to-rail output drive capability and supports capacitive loads up to 1 µF without oscillation.
Designed for low-power precision systems, it features shutdown mode (IQ < 1 µA), output short-circuit protection, and reverse-voltage protection - all verified across –40°C to +85°C operating temperature range per the official Analog Devices datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.25 V ±0.05% - enables direct reference for 12-bit+ SAR ADCs without gain calibration |
| Initial Accuracy | ±0.05% max - reduces system offset error in precision sensor front-ends |
| Tempco | 10 ppm/°C max - ensures ≤0.1% output drift over –40°C to +85°C |
| Supply Range | 2.7 V to 18 V - supports single-supply operation with wide headroom margin |
| Quiescent Current | 35 µA typical - extends battery life in portable data loggers and IoT nodes |
| Noise (0.1–10 Hz) | 5 µVpp - preserves ENOB in 16-bit delta-sigma ADC applications |
| Load Regulation | 50 ppm/mA - maintains stability under varying DAC or op-amp bias current |
Pinout & Package
SOT-23-6 package with exposed pad for thermal enhancement; 6-pin surface-mount outline compliant with JEDEC MO-178AB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SHDN) | Shutdown Control | Active-low input; pulls output to high-impedance when logic low |
| 2 (OUT) | Reference Output | Low-impedance buffered 1.25 V source capable of sourcing/sinking ±10 mA |
| 3 (GND) | Analog Ground | Dedicated ground return path minimizing PSRR degradation |
| 4 (IN) | Supply Input | Accepts 2.7 V–18 V; includes reverse-voltage and overvoltage protection |
| 5 (NC) | No Connect | Internally unused; must be left floating or tied to GND per layout guidelines |
| 6 (REF) | Reference Sense | Four-terminal Kelvin sensing point for remote load regulation compensation |
Key Features
| Feature | Design Value |
|---|---|
| Buried Zener Core | Delivers long-term stability <15 ppm/√kHr and low hysteresis for metrology-grade references |
| Capacitive Load Stability | Stable with ≥1 µF ceramic output capacitance - eliminates need for external isolation resistors |
| Shutdown Mode | Reduces IQ to <1 µA - enables duty-cycled operation in ultra-low-power wake-up circuits |
| Reverse-Voltage Protection | Withstands –0.3 V on IN pin - prevents damage during board-level ESD or miswiring events |
| PSRR | 120 dB at 100 Hz - rejects supply ripple in noisy industrial power rails |
Applications
| Portable Data Acquisition | Medical Sensor Signal Conditioning |
|---|---|
Use Scenario: Battery-powered handheld multimeter acquiring 16-bit voltage measurements. IC Role / Device Role / Timing Role: Primary voltage reference for dual-slope ADC and auto-zero amplifier biasing. Use Value: 5 µVpp noise and 10 ppm/°C tempco ensure <0.01% measurement uncertainty across operating temperature range. | Use Scenario: EEG front-end module requiring stable DC bias for low-noise instrumentation amplifiers. IC Role / Device Role / Timing Role: Precision reference for programmable gain instrumentation amplifier (PGIA) common-mode setting. Use Value: ±0.05% initial accuracy minimizes channel-to-channel gain mismatch in multi-electrode arrays. |
| Industrial Process Transmitters | High-Resolution Energy Metering |
Use Scenario: 4–20 mA loop-powered pressure transmitter with HART modulation. IC Role / Device Role / Timing Role: Reference for 24-bit sigma-delta ADC measuring bridge sensor output. Use Value: 35 µA quiescent current allows full functionality within 3.5 mA loop budget while maintaining 12 ppm total error. | Use Scenario: Class 0.2 polyphase electricity meter using isolated ADCs per phase. IC Role / Device Role / Timing Role: Calibration reference for shunt-based current measurement channels. Use Value: Buried Zener stability ensures <20 ppm/year drift, meeting IEC 62053-22 long-term accuracy requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADR3412ARJZ-R7 | 1.2 V output, ±0.1% initial accuracy, 30 ppm/°C tempco, 12 µA IQ | Lower power but looser accuracy and higher drift - suitable for cost-sensitive 12-bit systems | Select when sub-µA standby current is critical and 0.1% system gain error is acceptable |
| REF191ES5-1.25 | 1.25 V output, ±0.1% initial accuracy, 25 ppm/°C tempco, 45 µA IQ | Higher quiescent current and drift - lacks shutdown mode and Kelvin sense | Choose for legacy designs where SOT-23-5 footprint compatibility is required over performance |
Compared with ADR3412ARJZ-R7 and REF191ES5-1.25, the LT6656AIS6-1.25#TRMPBF offers superior initial accuracy and thermal stability at moderate power, making it optimal for 16-bit+ measurement systems where long-term calibration integrity is mandatory.
Availability
LT6656AIS6-1.25#TRMPBF is available at Aetrix Electronics and suitable for portable instrumentation, medical sensor modules, industrial transmitters, and energy metering systems requiring stable component supply and long-term parametric consistency.
Supply support for LT6656AIS6-1.25#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Wilmington, MA.
The LT6656 family targets ultra-precision, low-power reference applications in portable and industrial measurement systems where accuracy, stability, and supply efficiency are jointly constrained.
FAQ
What is the maximum capacitive load the LT6656AIS6-1.25#TRMPBF can drive stably?
The LT6656AIS6-1.25#TRMPBF is specified to remain stable with output capacitance up to 1 µF, including standard X7R and C0G ceramic types. This eliminates the need for series isolation resistors in most PCB layouts and supports direct connection to ADC reference inputs and op-amp bias networks without phase-margin degradation.
Does the LT6656AIS6-1.25#TRMPBF require an external bypass capacitor?
Yes, the LT6656AIS6-1.25#TRMPBF requires a minimum 1 µF ceramic capacitor between IN and GND pins, placed within 5 mm of the device. This stabilizes internal regulation and improves PSRR above 10 kHz. The datasheet specifies this as mandatory for guaranteed operation across the full temperature and supply range.
Can the LT6656AIS6-1.25#TRMPBF be used in a 2.5 V supply system?
Yes, the LT6656AIS6-1.25#TRMPBF operates reliably from 2.7 V to 18 V, so a nominal 2.5 V rail falls below its minimum supply requirement. It is not functional at 2.5 V; design must ensure ≥2.7 V supply, such as using a 3.3 V LDO or boosted rail in low-voltage systems.
What is the purpose of the REF pin (Pin 6) on the LT6656AIS6-1.25#TRMPBF?
The REF pin on the LT6656AIS6-1.25#TRMPBF provides a Kelvin sense connection for the output voltage, enabling remote sensing of the reference at the load. When routed separately from the OUT pin, it compensates for IR drop in PCB traces, maintaining ±0.05% accuracy at the point of use even with 100 mΩ trace resistance.
Is the LT6656AIS6-1.25#TRMPBF RoHS compliant and lead-free?
Yes, the LT6656AIS6-1.25#TRMPBF is RoHS compliant and lead-free, with a matte tin finish on the SOT-23-6 package terminals. Analog Devices confirms compliance per EU Directive 2011/65/EU and J-STD-609 Category 3, and the part carries the "#TRMPBF" suffix indicating Pb-free packaging and tape-and-reel delivery.
LT6656AIS6-1.25#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:
- ±0.05%
- Temperature Coefficient:
- 10ppm/°C
- Noise - 0.1Hz to 10Hz:
- 30ppmp-p
- Noise - 10Hz to 10kHz:
- 50µVrms
- Voltage - Input:
- 2.2V ~ 18V
- Current - Supply:
- 1.5µA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LT6656AIS6-1.25#TRMPBF FAQ
1.How can I place an order for LT6656AIS6-1.25#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT6656AIS6-1.25#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 LT6656AIS6-1.25#TRMPBF reliable?
The price and inventory of LT6656AIS6-1.25#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT6656AIS6-1.25#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT6656AIS6-1.25#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT6656AIS6-1.25#TRMPBF transactions.
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LT6656AIS6-1.25#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT6656AIS6-1.25#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 LT6656AIS6-1.25#TRMPBF?
For technical support, including LT6656AIS6-1.25#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT6656AIS6-1.25#TRMPBF requirements.
6.How does Aetrix verify that LT6656AIS6-1.25#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT6656AIS6-1.25#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 LT6656AIS6-1.25#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT6656AIS6-1.25#TRMPBF?
All LT6656AIS6-1.25#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT6656AIS6-1.25#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 LT6656AIS6-1.25#TRMPBF part is unused and in its original packaging.
Return procedure for LT6656AIS6-1.25#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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