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Analog Devices Inc. LT6656AIDC-1.25#TRM
- Part No.:
- LT6656AIDC-1.25#TRM
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LT6656AIDC-1.25#TRM.pdf
- Description:
- IC VREF SERIES 0.1% 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,467
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Product details
Overview
LT6656AIDC-1.25#TRM from Analog Devices is a precision 1.25V series voltage reference IC with 0.05% initial accuracy, 10ppm/°C temperature drift, and ultralow 850nA supply current. It operates down to 10mV dropout (VIN ≥ 1.35V at 0°C–70°C), delivers up to 5mA output drive, and is fully specified from –40°C to 85°C in a 6-lead DFN package. It serves as stable reference and supply for low-power ADCs in battery-powered instrumentation.
For engineers reviewing the LT6656AIDC-1.25#TRM datasheet, LT6656AIDC-1.25#TRM pinout, LT6656AIDC-1.25#TRM application, or LT6656AIDC-1.25#TRM equivalent, key selection criteria include micropower operation (<1µA), tight initial tolerance, low thermal drift, reverse input/output protection, and compatibility with 1µF output capacitance across ceramic/tantalum/electrolytic types.
Technical Context
The LT6656AIDC-1.25#TRM uses a bandgap-based error amplifier architecture to regulate a precise 1.25V output with minimal quiescent current. Its class-B output stage enables both sourcing and sinking capability for transient recovery, though it exhibits a ~7mV crossover deadband affecting settling behavior under light load steps.
Unlike shunt references, this series topology eliminates the need for external current-setting resistors-enabling direct connection to variable supplies from 1.35V to 18V while maintaining stability with ≥1µF output capacitance and low-ESR (≤5Ω) requirements. Internal reverse polarity protection withstands –18V on VIN or +18V on VOUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.25V ±0.05% (max initial error); enables accurate scaling for 12-bit+ ADCs with 2.5V full-scale range. |
| Temp Drift | 10ppm/°C max (Grade A); contributes ≤±80ppm error over –40°C to 85°C ambient, critical for field-deployed sensors. |
| Supply Current | 0.85µA typical; draws <1µA continuously-extends multi-year battery life in gas monitors or remote nodes. |
| Dropout Voltage | 10mV max at zero load; allows operation with VIN as low as 1.35V (at 0°C), ideal for single-cell LiFePO₄ or NiMH systems. |
| Load Regulation | 80ppm/mA (sourcing); ensures <±400ppm output shift from 0 to 5mA load-sufficient for driving SAR ADC reference inputs. |
| Output Noise | 30ppmP-P (0.1Hz–10Hz); ≈37.5µVP-P-low enough to avoid degrading ENOB in 16-bit precision data acquisition. |
| Long-Term Drift | 15ppm/√kHr (DFN package); predicts <±150ppm drift over 10 years-supports 10+ year calibration intervals in medical devices. |
Pinout & Package
LT6656AIDC-1.25#TRM is housed in a 6-lead (2mm × 2mm) plastic DFN package with exposed thermal pad (Pin 7). The package supports reflow soldering per JEDEC J-STD-020 and requires the exposed pad to be connected to GND for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND* (Pin 1) | Internal ground reference | Must be tied to system ground; connects internal bias network-floating causes regulation failure. |
| GND (Pin 2) | Device ground return | Main power ground path; decouples internal circuitry-connect directly to low-impedance ground plane. |
| NC (Pin 3) | No internal connection | May be left floating or tied to GND/VIN/VOUT; no functional impact but improves mechanical stability. |
| VIN (Pin 6) | Power supply input | Accepts 1.35V–18V; requires 0.1µF bypass capacitor within 1 inch-critical for PSRR >60dB above 10Hz. |
| VOUT (Pin 4) | Precision 1.25V output | Delivers regulated voltage; requires ≥1µF output capacitor-stability maintained across ESR ≤5Ω. |
| GND* (Exposed Pad, Pin 7) | Thermal & electrical ground | Mandatory GND connection; reduces θJA to 102°C/W and prevents thermal runaway during 5mA operation. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow supply current | 850nA typical-enables decade-long operation from coin cells in wireless sensor nodes. |
| Low dropout voltage | 10mV max-permits use with ultra-low-voltage sources like energy harvesters or depleted batteries. |
| Reverse input/output protection | Withstands –18V on VIN and +18V on VOUT-eliminates need for external diodes in rugged industrial interfaces. |
| Stable with wide ESR capacitors | Operates reliably with ceramic (ESR <10mΩ), tantalum (ESR ~1Ω), or electrolytic (ESR ~5Ω)-reduces BOM count and layout constraints. |
| Full industrial temp range | Guaranteed performance from –40°C to 85°C-qualified for automotive cabin electronics and outdoor metering. |
Applications
| Portable Gas Monitors | Precision Regulators |
|---|---|
Use Scenario: Battery-powered handheld CO/H₂S detector with electrochemical sensor and 16-bit ADC. IC Role / Device Role / Timing Role: Provides stable 1.25V reference and supply rail for sensor biasing and ADC conversion. Use Value: 0.05% accuracy and 10ppm/°C drift ensure <±0.1% gas concentration reading error across –20°C to 50°C operating range. | Use Scenario: Low-noise LDO feedback reference in medical infusion pump power management. IC Role / Device Role / Timing Role: Sets precise output voltage of adjustable LDO via resistor divider on feedback node. Use Value: 850nA quiescent current minimizes standby loss; 1µF-compatible output cap simplifies filtering without ferrite beads. |
| Battery-Powered Systems | Low Voltage Signal Processing |
Use Scenario: Solar-charged environmental logger using single-cell LiFePO₄ (2.5–3.6V) and 12-bit SAR ADC. IC Role / Device Role / Timing Role: Supplies reference and analog front-end bias from same rail as microcontroller. Use Value: 10mV dropout enables operation down to 1.35V-extends usable battery range by >15% versus 200mV-drop alternatives. | Use Scenario: Signal conditioning for MEMS accelerometer in wearable fitness tracker. IC Role / Device Role / Timing Role: References op-amp gain stages and ADC input scaling in sub-1V signal chain. Use Value: 30ppmP-P (0.1–10Hz) noise avoids introducing offset drift in DC-coupled motion sensing paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3412RTET | 1.2V output, 0.05% initial accuracy, 12ppm/°C drift, 950nA supply current, SOT-23-6 package. | Lower output voltage limits full-scale ADC resolution; higher drift increases error in wide-temp deployments. | Choose when 1.2V matches ADC reference requirement and board space favors TSOT-23 over DFN. |
| ADR3412ARJZ-R7 | 1.2V output, 0.1% initial accuracy, 20ppm/°C drift, 1.2µA supply current, SOT-23-6 package. | Loose tolerance and higher drift reduce measurement fidelity; higher current shortens battery life. | Select only for cost-sensitive, non-critical applications where 1.2V suffices and 85°C operation is not required. |
Compared with REF3412RTET and ADR3412ARJZ-R7, LT6656AIDC-1.25#TRM offers superior thermal stability (10ppm/°C vs 12–20ppm/°C) and lower quiescent current (0.85µA vs 0.95–1.2µA), enabling tighter measurement accuracy and longer runtime in portable instrumentation.
Availability
LT6656AIDC-1.25#TRM is available at Aetrix Electronics and suitable for portable gas monitors, battery-powered systems, and precision regulators requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LT6656AIDC-1.25#TRM 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.
The LT6656 product line delivers ultralow-power, high-accuracy voltage references for battery-constrained and thermally demanding applications-including portable instrumentation, remote sensing, and precision power management.
FAQ
What is the minimum input voltage required for stable operation of LT6656AIDC-1.25#TRM?
The LT6656AIDC-1.25#TRM requires a minimum input voltage of 1.35V at 0°C–70°C and 1.5V at –40°C–85°C to maintain output error within ±0.1%. This is enabled by its 10mV max dropout voltage. Below these thresholds, regulation degrades-verified in the Electrical Characteristics table under "Minimum Input Voltage" with load and temperature conditions.
Does LT6656AIDC-1.25#TRM require an external output capacitor, and what value is recommended?
Yes, LT6656AIDC-1.25#TRM requires a minimum 1µF output capacitor for stability. It remains stable across ceramic, tantalum, and electrolytic types with ESR ≤5Ω. Larger values (e.g., 10µF) improve transient response but increase settling time-designs should verify step-load behavior per Figure 3–4 in the datasheet.
Can LT6656AIDC-1.25#TRM be used in applications with reversed supply polarity?
Yes, LT6656AIDC-1.25#TRM includes reverse input protection and withstands –18V on VIN with VOUT grounded, and reverse output protection supporting +18V on VOUT with VIN grounded. This eliminates need for external protection diodes in harsh environments like automotive body control modules.
How does the load regulation specification of LT6656AIDC-1.25#TRM affect ADC reference accuracy?
LT6656AIDC-1.25#TRM has 80ppm/mA load regulation (sourcing). When driving a 5mA ADC reference input, this introduces ≤±400ppm (0.04%) output shift-equivalent to <0.01 LSB error in a 16-bit system. For highest accuracy, keep reference load constant or buffer with low-input-bias op-amp.
Is LT6656AIDC-1.25#TRM compatible with lead-free reflow processes?
Yes, LT6656AIDC-1.25#TRM features lead-free finish and complies with JEDEC J-STD-020 moisture sensitivity level (MSL) 1. Peak reflow temperature is rated to 260°C, and the DFN package's exposed pad must be soldered to GND for thermal reliability-confirmed in the "Order Information" and "Absolute Maximum Ratings" sections.
LT6656AIDC-1.25#TRM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 6-WFDFN Exposed Pad
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- -
- Current - Output:
- 5 mA
- Tolerance:
- ±0.1%
- Temperature Coefficient:
- 10ppm/°C
- Noise - 0.1Hz to 10Hz:
- 30ppmp-p
- Noise - 10Hz to 10kHz:
- 50µVrms
- Voltage - Input:
- 1.35V ~ 18V
- Current - Supply:
- 1.5µA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-DFN (2x2)
LT6656AIDC-1.25#TRM FAQ
1.How can I place an order for LT6656AIDC-1.25#TRM through Aetrix?
Please submit a Request for Quotation (RFQ) for LT6656AIDC-1.25#TRM 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 LT6656AIDC-1.25#TRM reliable?
The price and inventory of LT6656AIDC-1.25#TRM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT6656AIDC-1.25#TRM is usually 5 days.
3.What payment methods are accepted for LT6656AIDC-1.25#TRM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT6656AIDC-1.25#TRM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT6656AIDC-1.25#TRM?
LT6656AIDC-1.25#TRM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT6656AIDC-1.25#TRM 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 LT6656AIDC-1.25#TRM?
For technical support, including LT6656AIDC-1.25#TRM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT6656AIDC-1.25#TRM requirements.
6.How does Aetrix verify that LT6656AIDC-1.25#TRM is sourced from the original manufacturer or authorized distributors?
All LT6656AIDC-1.25#TRM 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 LT6656AIDC-1.25#TRM meets industry standards.
7.What is the process for return or replacement of LT6656AIDC-1.25#TRM?
All LT6656AIDC-1.25#TRM units undergo pre-shipment inspection (PSI). If there is an issue with LT6656AIDC-1.25#TRM, 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 LT6656AIDC-1.25#TRM part is unused and in its original packaging.
Return procedure for LT6656AIDC-1.25#TRM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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