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Analog Devices Inc. LT1461AIS8-3.3#TRPBF
- Part No.:
- LT1461AIS8-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1461AIS8-3.3#TRPBF.pdf
- Description:
- IC VREF SERIES 0.04% 8SOIC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LT1461AIS8-3.3#TRPBF from Analog Devices is a micropower precision low-dropout series voltage reference delivering 3.3V output with ±0.04% initial accuracy, 3ppm/°C max temperature coefficient, 35µA supply current, 50mA output drive, and <300mV dropout at zero load - used in high-resolution ADC/DAC biasing, portable instrumentation, and precision regulator feedback paths.
For engineers reviewing the LT1461AIS8-3.3#TRPBF datasheet, LT1461AIS8-3.3#TRPBF pinout, LT1461AIS8-3.3#TRPBF application, or LT1461AIS8-3.3#TRPBF equivalent, key selection criteria include guaranteed –40°C to +85°C operation, shutdown control capability, thermal hysteresis of 75ppm over –40°C to +85°C, and SO-8 package compatibility with standard PCB layout practices for stress-sensitive analog systems.
Technical Context
The LT1461AIS8-3.3#TRPBF implements curvature-compensated bandgap architecture with trimmed thin-film resistors to achieve its 3ppm/°C tempco and 0.04% initial accuracy. Its internal shutdown logic responds to Pin 3 (SHDN) voltage thresholds: ≥2.4V enables normal operation; ≤0.8V forces shutdown with ≤35µA quiescent current.
It maintains load regulation of 12ppm/mA (typical) and line regulation of 2ppm/V (typical) across its specified input range (VOUT + 0.5V ≤ VIN ≤ 20V), while thermal regulation remains negligible under steady-state conditions - critical for minimizing system error budgets in 16-bit data acquisition systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3V ±0.04% - ensures stable reference for 14–16-bit converter full-scale calibration without trimming. |
| Tempco | 3ppm/°C max - limits drift to <±0.26mV over –40°C to +85°C ambient, supporting industrial-grade accuracy. |
| Supply Current | 35µA typ - enables multi-year battery life in handheld meters and IoT sensor nodes. |
| Dropout Voltage | 0.13V at 1mA load - allows operation from single-cell Li-ion (3.0V min) while maintaining full spec performance. |
| Output Drive | 50mA min - supports direct driving of op-amp bias networks, DAC reference inputs, and low-impedance regulator error amplifiers. |
| Shutdown Current | 25µA max - reduces system standby power without external switching circuitry. |
| Noise (0.1–10Hz) | 8ppmP-P - contributes <±0.026mV peak-to-peak error in precision DC measurement paths. |
Pinout & Package
LT1461AIS8-3.3#TRPBF uses an 8-lead plastic SO (SO-8) package with θJA = 190°C/W and maximum junction temperature of 150°C. Pin 1 is located at the top-left corner when the notch faces upward.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Reference ground return; must be connected to low-impedance analog ground plane to minimize noise coupling. |
| 2 | VIN | Input supply pin; requires ≥0.5V headroom above VOUT for regulation; accepts up to 20V. |
| 3 | SHDN | Active-low shutdown control; drives <4µA at logic low (≤0.8V); floats or ≥2.4V for enable. |
| 4 | DNC | Do Not Connect - internally unused; must remain unconnected per datasheet. |
| 5 | DNC | Do Not Connect - no internal connection; avoid routing traces or vias. |
| 6 | VOUT | Regulated 3.3V output; requires ≥2µF ceramic output capacitor for stability under >1mA loads. |
| 7 | DNC | Do Not Connect - reserved; floating connection prevents parasitic coupling. |
| 8 | DNC | Do Not Connect - electrically isolated; ties to package thermal pad only if modified design. |
Key Features
| Feature | Design Value |
|---|---|
| Low dropout voltage | 0.06V at zero load enables use with ultra-low-voltage sources like coin cells or energy-harvesting outputs. |
| Shutdown control | Pin 3 toggles full 50mA output drive on/off, enabling system-level power sequencing without external MOSFETs. |
| Thermal shutdown protection | Activates at ~150°C junction temperature, preventing permanent damage during overload or poor heatsinking. |
| High output current | 50mA sourcing capability eliminates need for external buffer op-amps in most precision regulator designs. |
| Guaranteed industrial temp range | –40°C to +85°C operation validated across all electrical specs - suitable for factory automation and outdoor instrumentation. |
Applications
| Industrial Data Acquisition | Portable Medical Instrumentation |
|---|---|
Use Scenario: 16-bit SAR ADC front-end in programmable logic controller (PLC) analog input modules operating in factory environments with wide ambient swings. IC Role / Device Role / Timing Role: Provides stable 3.3V reference for ADC conversion accuracy and offset calibration, directly tied to ADC REF+ pin. Use Value: 3ppm/°C tempco and 0.04% initial accuracy ensure <±1 LSB error over full temperature range without recalibration. | Use Scenario: Battery-powered ECG monitor requiring low-power, high-stability reference for analog front-end gain and offset setting. IC Role / Device Role / Timing Role: Supplies precision 3.3V bias to instrumentation amplifier and ADC reference, enabled only during active measurement cycles via SHDN. Use Value: 35µA supply current and shutdown mode extend AA battery life beyond 2 years; 50mA drive supports fast settling into capacitive ADC inputs. |
| Precision Linear Regulator Feedback | Automotive Sensor Signal Conditioning |
Use Scenario: High-accuracy 3.3V LDO regulator for FPGA I/O banks where reference stability directly impacts signal integrity margins. IC Role / Device Role / Timing Role: Serves as error amplifier reference in adjustable LDO feedback loop, replacing less accurate internal bandgap references. Use Value: 12ppm/mA load regulation minimizes output variation during FPGA I/O switching transients, improving PSRR by >10dB. | Use Scenario: Reference source for pressure and temperature sensor signal conditioning in engine control units (ECUs) meeting AEC-Q100 Grade 2 requirements. IC Role / Device Role / Timing Role: Delivers 3.3V reference to ratiometric sensor bridge excitation and ADC reference, operating continuously across –40°C to +85°C. Use Value: Guaranteed –40°C to +85°C performance and 75ppm thermal hysteresis meet automotive long-term stability requirements without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3033AIDBZR | 3.3V, 0.2% initial accuracy, 50ppm/°C tempco, 50µA supply current, SOT-23-3 package | Lacks shutdown pin; lower accuracy/tempco spec; smaller footprint but no thermal hysteresis data published | Select for cost-sensitive, space-constrained designs where ±0.2% accuracy suffices and shutdown is handled externally. |
| ADR3433ARJZ-R7 | 3.3V, 0.1% initial accuracy, 10ppm/°C tempco, 120µA supply current, SOT-23-6 package with enable pin | Higher supply current; wider tempco; includes enable (not shutdown) with different logic polarity and timing | Choose when higher drive current (>10mA) and tighter long-term drift (<30ppm/√kHr) are prioritized over micropower operation. |
Compared with REF3033AIDBZR and ADR3433ARJZ-R7, the LT1461AIS8-3.3#TRPBF delivers superior initial accuracy (0.04% vs ≥0.1%), lower tempco (3ppm/°C vs ≥10ppm/°C), and true shutdown capability - making it optimal for high-precision, low-power, thermally demanding applications where reference stability directly defines system resolution.
Availability
LT1461AIS8-3.3#TRPBF is available at Aetrix Electronics and suitable for industrial data acquisition, portable medical instrumentation, and precision linear regulator feedback requiring stable component supply with guaranteed –40°C to +85°C operation and tape-and-reel packaging for automated assembly.
Supply support for LT1461AIS8-3.3#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, communications, automotive, and healthcare markets.
The LT1461 family was designed specifically for precision voltage reference applications demanding micropower operation, low thermal hysteresis, and robust industrial temperature performance - targeting high-resolution data converters, portable test equipment, and regulated power supply feedback loops.
FAQ
What is the maximum input voltage rating for LT1461AIS8-3.3#TRPBF?
The absolute maximum input voltage for LT1461AIS8-3.3#TRPBF is 20V, as specified in the Absolute Maximum Ratings table. Operation above this level risks permanent damage. For reliable regulation, VIN must be ≥(VOUT + 0.5V) = 3.8V minimum, and the recommended operating range is 3.8V to 20V with proper input bypassing.
Does LT1461AIS8-3.3#TRPBF require external capacitors, and if so, what values?
Yes, LT1461AIS8-3.3#TRPBF requires both input and output capacitors. A minimum 1µF ceramic capacitor is needed at VIN (bypass), and ≥2µF ceramic is required at VOUT for stability under loads >1mA. The datasheet confirms that omitting the output capacitor causes instability, especially during load transients up to 50mA.
How does the shutdown function operate on LT1461AIS8-3.3#TRPBF?
The shutdown pin (Pin 3) of LT1461AIS8-3.3#TRPBF is active-low: applying ≤0.8V disables the reference output and reduces supply current to ≤35µA, while ≥2.4V enables full operation. The part functions normally with Pin 3 left open (high-impedance), drawing only 35µA quiescent current - no pull-up resistor is required.
What is the thermal hysteresis specification for LT1461AIS8-3.3#TRPBF?
LT1461AIS8-3.3#TRPBF exhibits 75ppm thermal hysteresis over the –40°C to +85°C temperature range, as documented in the Electrical Characteristics table. This value represents the maximum output voltage shift observed after cycling between extremes and returning to 25°C - a critical parameter for systems requiring repeatable calibration across thermal cycles.
Is LT1461AIS8-3.3#TRPBF qualified for automotive applications?
No, LT1461AIS8-3.3#TRPBF is rated for industrial temperature range (–40°C to +85°C) but is not AEC-Q100 qualified. For automotive use, Analog Devices offers the LT1461DHS8-3.3#WTRPBF variant, which carries the #W suffix and meets AEC-Q100 Grade 0 (–40°C to +125°C) requirements with full automotive reliability reporting.
LT1461AIS8-3.3#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- 100 mA
- Tolerance:
- ±0.04%
- Temperature Coefficient:
- 3ppm/°C
- Noise - 0.1Hz to 10Hz:
- 8ppmp-p
- Noise - 10Hz to 10kHz:
- 9.6ppmrms
- Voltage - Input:
- 3.8V ~ 20V
- Current - Supply:
- 70µA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1461AIS8-3.3#TRPBF FAQ
1.How can I place an order for LT1461AIS8-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1461AIS8-3.3#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 LT1461AIS8-3.3#TRPBF reliable?
The price and inventory of LT1461AIS8-3.3#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1461AIS8-3.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1461AIS8-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1461AIS8-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1461AIS8-3.3#TRPBF?
LT1461AIS8-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1461AIS8-3.3#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 LT1461AIS8-3.3#TRPBF?
For technical support, including LT1461AIS8-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1461AIS8-3.3#TRPBF requirements.
6.How does Aetrix verify that LT1461AIS8-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1461AIS8-3.3#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 LT1461AIS8-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1461AIS8-3.3#TRPBF?
All LT1461AIS8-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1461AIS8-3.3#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 LT1461AIS8-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LT1461AIS8-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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